<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0016-3813</journal-id>
<journal-title><![CDATA[Gaceta médica de México]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. Méd. Méx]]></abbrev-journal-title>
<issn>0016-3813</issn>
<publisher>
<publisher-name><![CDATA[Academia Nacional de Medicina de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-38132006000300009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estrés oxidativo, péptido &beta;-amiloide y enfermedad de Alzheimer]]></article-title>
<article-title xml:lang="en"><![CDATA[Oxidate stress &beta;-amiloide peptide and Alzheimer's disease]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manzano-León]]></surname>
<given-names><![CDATA[Natalia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mas-Oliva]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,UNAM Instituto de Fisiología Celular ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<volume>142</volume>
<numero>3</numero>
<fpage>229</fpage>
<lpage>238</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-38132006000300009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-38132006000300009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-38132006000300009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La enfermedad de Alzheimer es la causa más común de demencia en la población de edad avanzada. Una de las características histopatológicas de esta enfermedad es la formación de placas seniles, cuyo componente proteínico es el péptido &beta;-amiloide (A&beta;) ensuforma insoluble. Este péptido se produce normalmente en forma monomérica soluble y circula en concentraciones bajas en el líquido cefalorraquídeo y sangre. En concentraciones fisiológicas actúa como factor neurotrófico y neuroprotector, sin embargo con el envejecimiento y sobre todo en la enfermedad de Alzheimer se acumula, forma fibrillas insolubles y causa neurotoxicidad. La toxicidad del A&beta; se ha asociado a la generación de radicales libres que causan peroxidación de lípidos y oxidación de proteínas entre otros daños. Se ha planteado que el A&beta; pueda reconocer a receptores específicos que median a su vez neurotoxicidad. Entre estos se encuentra el receptor scavenger o pepenador que se expresa en la microglia y es capaz de internalizar agregados de este péptido. Independientemente de la vía de entrada del péptido a la célula, éste genera un estado de estrés oxidativo que eventualmente desencadena la muerte celular. Estudios recientes desarrollados en nuestro laboratorio muestran que el proceso de traducción de proteínas que intervienen en el proceso de endocitosis mediada por un receptor puede ser afectado por una condición de estrés oxidativo. Este es el caso de la &beta;-adaptina, proteína clave en la formación del pozo cubierto.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Alzheimer's disease, the leading cause of dementia in the elderly is characterized by the presence in the brain of senile plaques formed of insoluble fibrillar deposits of &beta;-amyloid peptide. This peptide is normally produced in a monomeric soluble form and it is present in low concentrations in the blood and spinal fluid. At physiological concentrations, this peptide is a neurotrophic and neuroprotector factor; nevertheless, with aging and particularly in Alzheimer's disease this peptide accumulates, favors the formation of insoluble fibrils and causes neurotoxicity. &beta;-amyloid peptide toxicity has been associated with the generation of free radicals that in turn promote lipid peroxidation and protein oxidation. Through the recognition of specific receptors such as the scavenger receptor, the &beta;-amyloid peptide becomes internalizedin the form of aggregates. Independently of the way the peptide enters the cell, it generates oxidative stress that eventually triggers a state of neurotoxicity and cell death. Recent studies in our laboratory have shown the effect caused by an extracellular oxidative stress upon the internalization of the scavenger receptor. We have also demonstrated that the process of protein translation of molecules implicated in the mechanism of endocytosis through the scavenger receptor, such as the case of &beta;-adaptin, is arrested in microglial cells treated with &beta;-amyloid.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Estrés oxidativo]]></kwd>
<kwd lng="es"><![CDATA[péptido &beta;-amiloide]]></kwd>
<kwd lng="es"><![CDATA[microglia]]></kwd>
<kwd lng="es"><![CDATA[receptor pepenador]]></kwd>
<kwd lng="en"><![CDATA[Oxidative stress]]></kwd>
<kwd lng="en"><![CDATA[&beta;-amyloid peptide]]></kwd>
<kwd lng="en"><![CDATA[microglial cells]]></kwd>
<kwd lng="en"><![CDATA[scavenger receptor]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culo de revisi&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Estr&eacute;s oxidativo, p&eacute;ptido &beta;&#150;amiloide y enfermedad de Alzheimer</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Oxidate stress &beta;&#150;amiloide peptide and Alzheimer's disease</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Natalia Manzano&#150;Le&oacute;n y Jaime Mas&#150;Oliva*</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido en su versi&oacute;n modificada: 13 de enero de 2006    <br> Aceptado: 27 de enero de 2006</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>*Correspondencia y solicitud de sobretiros: </b>    <br>     <i>Jaime Mas&#150;Oliva,     <br>     Instituto de Fisiolog&iacute;a Celular, UNAM. Apdo. postal 70&#150;243,     <br>     04510 M&eacute;xico, D.F.     <br>   Tel: 5622 5584, </i>    <br>   correo electr&oacute;nico: <a href="mailto:jmas@ifc.unam.mx">jmas@ifc.unam.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>La enfermedad de Alzheimer es la causa m&aacute;s com&uacute;n de demencia en la poblaci&oacute;n de edad avanzada. Una de las caracter&iacute;sticas histopatol&oacute;gicas de esta enfermedad es la formaci&oacute;n de placas seniles, cuyo componente prote&iacute;nico es el p&eacute;ptido &beta;&#150;amiloide (A&beta;) ensuforma insoluble. Este p&eacute;ptido se produce normalmente en forma monom&eacute;rica soluble y circula en concentraciones bajas en el l&iacute;quido cefalorraqu&iacute;deo y sangre. En concentraciones fisiol&oacute;gicas act&uacute;a como factor neurotr&oacute;fico y neuroprotector, sin embargo con el envejecimiento y sobre todo en la enfermedad de Alzheimer se acumula, forma fibrillas insolubles y causa neurotoxicidad.</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>La toxicidad del A&beta; se ha asociado a la generaci&oacute;n de radicales libres que causan peroxidaci&oacute;n de l&iacute;pidos y oxidaci&oacute;n de prote&iacute;nas entre otros da&ntilde;os. Se ha planteado que el A&beta; pueda reconocer a receptores espec&iacute;ficos que median a su vez neurotoxicidad. Entre estos se encuentra el receptor scavenger o pepenador que se expresa en la microglia y es capaz de internalizar agregados de este p&eacute;ptido. Independientemente de la v&iacute;a de entrada del p&eacute;ptido a la c&eacute;lula, &eacute;ste genera un estado de estr&eacute;s oxidativo que eventualmente desencadena la muerte celular.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>Estudios recientes desarrollados en nuestro laboratorio muestran que el proceso de traducci&oacute;n de prote&iacute;nas que intervienen en el proceso de endocitosis mediada por un receptor puede ser afectado por una condici&oacute;n de estr&eacute;s oxidativo. Este es el caso de la &beta;&#150;adaptina, prote&iacute;na clave en la formaci&oacute;n del pozo cubierto.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b><i>Estr&eacute;s oxidativo, p&eacute;ptido &beta;&#150;amiloide, microglia, receptor pepenador</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Summary</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>Alzheimer's disease, the leading cause of dementia in the elderly is characterized by the presence in the brain of senile plaques formed of insoluble fibrillar deposits of &beta;&#150;amyloid peptide. This peptide is normally produced in a monomeric soluble form and it is present in low concentrations in the blood and spinal fluid. At physiological concentrations, this peptide is a neurotrophic and neuroprotector factor; nevertheless, with aging and particularly in Alzheimer's disease this peptide accumulates, favors the formation of insoluble fibrils and causes neurotoxicity.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>&beta;&#150;amyloid peptide toxicity has been associated with the generation of free radicals that in turn promote lipid peroxidation and protein oxidation. Through the recognition of specific receptors such as the scavenger receptor, the &beta;&#150;amyloid peptide becomes internalizedin the form of aggregates. Independently of the way the peptide enters the cell, it generates oxidative stress that eventually triggers a state of neurotoxicity and cell death.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>Recent studies in our laboratory have shown the effect caused by an extracellular oxidative stress upon the internalization of the scavenger receptor. We have also demonstrated that the process of protein translation of molecules implicated in the mechanism of endocytosis through the scavenger receptor, such as the case of &beta;&#150;adaptin, is arrested in microglial cells treated with &beta;&#150;amyloid.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b><i>Oxidative stress, &beta;&#150;amyloid peptide, microglial cells, scavenger receptor</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">La enfermedad de Alzheimer es una de las causas m&aacute;s comunes de demencia en la poblaci&oacute;n de edad avanzada. Su principal caracter&iacute;stica cl&iacute;nica es el deterioro de la capacidad cognoscitiva, que se da como consecuencia de la p&eacute;rdida masiva y progresiva de neuronas en diferentes regiones del cerebro. El estudio histopatol&oacute;gico postmortem de cerebros de pacientes afectados con esta enfermedad muestra dos caracter&iacute;sticas morfol&oacute;gicas principales: mara&ntilde;as neurofibrilares y placas seniles o placas neur&iacute;ticas;<sup>1</sup> estructuras descritas por primera vez en 1907 por Alois Alzheimer. </font></p>     <p align="justify"><font face="verdana" size="2">Las mara&ntilde;as neurofibrilares son dep&oacute;sitos proteicos intracelulares formados por la prote&iacute;na x estabilizadora asociada a microt&uacute;bulos (MAP&#150;&tau;) que se encuentra hiperfosforilada, as&iacute; como por neurofilamentos de mediano y alto peso molecular.</font></p>     <p align="justify"><font face="verdana" size="2">Esta MAP&#150;&tau; modificada es resistente a cortes proteol&iacute;ticos, lo cual sugiere que adem&aacute;s de la fosforilaci&oacute;n puede sufrir otras modificaciones como la glucosilaci&oacute;n y la formaci&oacute;n de puentes disulfuro que contribuyen a que se forme un entrecruzamiento entre mon&oacute;meros de MAP&#150;&tau;.<sup>2</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las placas seniles de la enfermedad de Alzheimer est&aacute;n formadas por un centro proteico rodeado de neuronas degeneradas,<sup>3</sup> as&iacute; como de c&eacute;lulas de glia y microglia. El p&eacute;ptido &beta;&#150;amiloide (A&beta; en su forma insoluble de dep&oacute;sitos fibrilares, es el principal componente proteico de estas placas. Esta observaci&oacute;n realizada a mitad de los a&ntilde;os 80's,<sup>4</sup> llev&oacute; a pensar que los dep&oacute;sitos de este p&eacute;ptido pudieran corresponder al primer paso en la patog&eacute;nesis de esta enfermedad y se les relacion&oacute; directamente con neurodegeneraci&oacute;n.<sup>5</sup> Esta hip&oacute;tesis gan&oacute; terreno al demostrarse que el A&beta; es t&oacute;xico para neuronas en cultivo.<sup>6,</sup><sup>7</sup></font></p>     <p align="justify"><font face="verdana" size="2">El A&beta; puede tener entre 39 y 43 amino&aacute;cidos, presenta un peso molecular de 4 KDa y se deriva de un precursor de mayor tama&ntilde;o denominado prote&iacute;na precursora del p&eacute;ptido A&beta; (APP)<sup>4</sup> <a href="#f1">figura 1</a>. La APP es una glicoprote&iacute;na transmembranal que se deriva a su vez de un proteoglicano de mayor tama&ntilde;o denominado PDMBP (Platelet&#150;Derived Macrophage&#150;Binding Proteoglycan) secretado en grandes cantidades por las plaquetas<sup>8</sup> y que inhibe la endocitosis de LDL&#150;Ac (Lipoprote&iacute;nas de baja densidad acetiladas) en macr&oacute;fagos.<sup>9 </sup>Existen tres isoformas de la APP: las isoformas de 751 y 770 amino&aacute;cidos encontradas tanto en neuronas como en c&eacute;lulas no neuronales, y la isoforma de 695 amino&aacute;cidos que se expresa en grandes cantidades en neuronas, (<a href="#f2">Figura 2</a>).<sup>10</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/gmm/v142n3/a9f1.jpg"></font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/gmm/v142n3/a9f2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">La APP puede sufrir un proceso proteol&iacute;tico por la &beta;&#150;secretasa, que rompe al dominio que corresponde al p&eacute;ptido A&beta; y que produce un precursor soluble (sAPP) con un peso molecular de entre 90&#150;100 KDa.<sup>11</sup> Adem&aacute;s de las neuronas, las plaquetas tambi&eacute;n secretan sAPP, el cual compite con las LDL&#150;Ac por la uni&oacute;n al receptor scavenger o pepenador (RS) clase A.<sup>12</sup> Un procesamiento alternativo para APP llevado a cabo por la &beta;&#150; y &gamma;&#150;secretasas, rompe a la prote&iacute;na precursora en los dominios extracelular y transmembranal, lo que la convierte en el p&eacute;ptido &beta;&#150;amiloide soluble (sA&beta;).<sup>13</sup></font></p>     <p align="justify"><font face="verdana" size="2">De la evidencia que sustenta la asociaci&oacute;n entre APP y la patolog&iacute;a del Alzheimer destaca lo siguiente:</font></p>     <p align="justify"><font face="verdana" size="2">1. Diferentes mutaciones de APP tienen relaci&oacute;n con un aumento en la producci&oacute;n de A&beta;.<sup>14,15</sup></font></p>     <p align="justify"><font face="verdana" size="2">2. El gen de APP se localiza en el cromosoma 21, y en cerebros de individuos con trisom&iacute;a 21 existen dep&oacute;sitos de A&beta;<sup>16</sup> lo que lleva eventualmente al desarrollo de esta enfermedad.<sup>17</sup></font></p>     <p align="justify"><font face="verdana" size="2">3. Ratones que sobre&#150;expresan APP presentan algunas caracter&iacute;sticas de la patolog&iacute;a del Alzheimer.<sup>18</sup></font></p>     <p align="justify"><font face="verdana" size="2">4. Mutaciones en las presenilinas, prote&iacute;nas que regulan los cortes proteol&iacute;ticos de APP, pueden contribuir a la patog&eacute;nesis del Alzheimer al incrementar la producci&oacute;n de A&beta;.<sup>19,</sup><sup>20</sup></font></p>     <p align="justify"><font face="verdana" size="2">Es importante aclarar que independientemente de que el A&beta; juega un importante papel en el desarrollo de la enfermedad de Alzheimer, este padecimiento tiene varios componentes patofisiol&oacute;gicos que a&uacute;n no se conocen con exactitud y que complican el entendimiento de la enfermedad. Se han realizado estudios sobre la relaci&oacute;n entre el n&uacute;mero de placas seniles y "mara&ntilde;as" neurofibrilares con el grado de demencia de los pacientes con Alzheimer, encontrando que el n&uacute;mero de "mara&ntilde;as" neurofibrilares y/o la extensi&oacute;n de la p&eacute;rdida sin&aacute;ptica en la corteza cerebral est&aacute; m&aacute;s relacionado con el grado de demencia que con el n&uacute;mero de dep&oacute;sitos del p&eacute;ptido.<sup>21</sup> Incluso las placas seniles pueden sorprendentemente estar en &aacute;reas del cerebro libres de anormalidades neuronales<sup>22</sup> y en contraparte, la p&eacute;rdida sin&aacute;ptica puede ocurrir en zonas completamente carentes de placas.<sup>23</sup></font></p>     <p align="justify"><font face="verdana" size="2">El t&eacute;rmino "amiloide" hace referencia al almid&oacute;n o a un compuesto parecido a la celulosa. Fue en 1851 cuando Virchow<sup>24</sup> lo us&oacute; por primera vez para referirse a dep&oacute;sitos de polisac&aacute;ridos que se ti&ntilde;en con el colorante rojo Congo.<sup>25</sup> Por otra parte, "amiloidosis" es un t&eacute;rmino usado en la medicina para describir c&uacute;mulos de p&eacute;ptidos que se presentan en varias enfermedades y en diferentes tejidos y que tienen la capacidad de agregarse como fibras insolubles. Estas fibras amiloid&oacute;ticas forman filamentos no ramificados de entre 6 y 10 nm de di&aacute;metro y presentan una estructura secundaria de l&aacute;mina &beta; plegada, conformaci&oacute;n que por lo general es indispensable para que estos p&eacute;ptidos sean t&oacute;xicos.<sup>26</sup></font></p>     <p align="justify"><font face="verdana" size="2">El A&beta; es producido normalmente en su forma monom&eacute;rica soluble y circula en concentraciones bajas en el l&iacute;quido cefalorraqu&iacute;deo y sangre. Con el envejecimiento y sobre todo en la enfermedad de Alzheimer se forman agregados fibrilares insolubles. Existe una fuerte relaci&oacute;n entre este proceso de formaci&oacute;n de fibrillas y la capacidad del p&eacute;ptido para causar toxicidad en neuronas y activaci&oacute;n de c&eacute;lulas de microglia.<sup>27</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Papel fisiol&oacute;gico del p&eacute;ptido &beta;&#150;amiloide</i></font></p>     <p align="justify"><font face="verdana" size="2">A pesar del papel aparentemente negativo que presenta el A&beta; en la enfermedad de Alzheimer, &eacute;ste p&eacute;ptido participa, de una forma que no ha sido explicada con exactitud en varias funciones celulares normales, por ejemplo:</font></p>     <p align="justify"><font face="verdana" size="2">1. Ejerce una funci&oacute;n aut&oacute;crina y estimula la proliferaci&oacute;n celular.<sup>28</sup></font></p>     <p align="justify"><font face="verdana" size="2">2. Promueve la adhesi&oacute;n celular<sup>29</sup> y protege a las neuronas contra da&ntilde;o oxidativo.<sup>30</sup></font></p>     <p align="justify"><font face="verdana" size="2">3. El p&eacute;ptido sA&beta; puede interferir en procesos de se&ntilde;alizaci&oacute;n, v&iacute;a prote&iacute;nas G<sup>31</sup> e incrementar la actividad de la MAP cinasa.<sup>32</sup></font></p>     <p align="justify"><font face="verdana" size="2">4. En concentraciones fisiol&oacute;gicas puede actuar como factor neurotr&oacute;fico y neuroprotector.<sup>33,</sup><sup>34</sup></font></p>     <p align="justify"><font face="verdana" size="2">5. Se ha planteado que es un regulador fisiol&oacute;gico de la funci&oacute;n de canales i&oacute;nicos (K<sup>+</sup>, Ca<sup>2+</sup>) en neuronas<sup>35,</sup><sup>36</sup> y que es secretado por algunas de &eacute;stas c&eacute;lulas en respuesta a la actividad neuronal para regular negativamente la transmisi&oacute;n sin&aacute;ptica excitatoria.<sup>37</sup></font></p>     <p align="justify"><font face="verdana" size="2">6. Se ha propuesto que los dep&oacute;sitos de A&beta; puedan atrapar iones met&aacute;licos potencialmente peligrosos.<sup>38,</sup><sup>39</sup></font></p>     <p align="justify"><font face="verdana" size="2">7. Concentraciones nanomolares del p&eacute;ptido pueden bloquear la apoptosis neuronal provocada por la ausencia de factores tr&oacute;ficos.<sup>40</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El A&beta; posee una alta afinidad por Cu<sup>2+</sup> y Zn<sup>2+</sup> y tambi&eacute;n puede catalizar la dismutaci&oacute;n del radical super&oacute;xido (O<sub>2</sub>) a H<sub>2</sub>O<sub>2</sub>, actuando entonces como antioxidante.<sup>41,42</sup> Se han detectado dep&oacute;sitos de A&beta; en cerebros humanos despu&eacute;s de da&ntilde;o traum&aacute;tico,<sup>43</sup> y se sabe que tanto el p&eacute;ptido 1&#150;40, pero especialmente el 1&#150;42, aumentan su concentraci&oacute;n en el fluido cerebroespinal durante la primera semana que sigue a un traumatismo encef&aacute;lico.<sup>44</sup></font></p>     <p align="justify"><font face="verdana" size="2">Algunos grupos de estudio han mostrado que el n&uacute;mero de placas de A&beta; y de mara&ntilde;as neurofibrilares en la corteza cerebral est&aacute;n correlacionadas inversamente con el estr&eacute;s oxidativo,<sup>45&#150;</sup><sup>48</sup> por lo que cuando la concentraci&oacute;n del A&beta; se incrementa, el da&ntilde;o citopl&aacute;smico disminuye. En pacientes con s&iacute;ndrome de Down tambi&eacute;n existe correlaci&oacute;n negativa entre los dep&oacute;sitos de Ap y da&ntilde;o oxidativo.<sup>49</sup></font></p>     <p align="justify"><font face="verdana" size="2">Sin embargo, a pesar de que se han aislado olig&oacute;meros solubles del Ap tanto de cerebros normales como de cerebros afectados por la enfermedad de Alzheimer;<sup>50</sup> los niveles del p&eacute;ptido soluble suelen ser mayores en pacientes con esta enfermedad que en sujetos normales, siendo mayor la proporci&oacute;n del p&eacute;ptido 1&#150;42 que la del p&eacute;ptido 1&#150;40.<sup>51</sup> El p&eacute;ptido 1&#150;42 es menos soluble que las otras isoformas del p&eacute;ptido, desarrolla fibrillas mucho m&aacute;s r&aacute;pido<sup>52</sup> y promueve la agregaci&oacute;n de formas m&aacute;s peque&ntilde;as como la 1&#150;40.</font></p>     <p align="justify"><font face="verdana" size="2">Por otra parte, mediante la utilizaci&oacute;n de ensayos in vitro se sabe que los p&eacute;ptidos que contienen al fragmento hidrof&oacute;bico 29&#150;35 (GAIIGLM) forman lentamente agregados estables y se transforman en neurot&oacute;xicos despu&eacute;s de un proceso de incubaci&oacute;n. En cambio el fragmento 25&#150;35 (GSNKGAIIGLM), descrito como la parte m&aacute;s t&oacute;xica del p&eacute;ptido, se agrega r&aacute;pidamente y es neurot&oacute;xico de forma inmediata.<sup>53</sup> Todos estos estudios han demostrado que es necesaria la transici&oacute;n del p&eacute;ptido de una forma soluble monom&eacute;rica a una insoluble o fibrilar para que sean t&oacute;xicos a la c&eacute;lula y que esto es el resultado de un cambio al azar en su estructura secundaria (random coil) y &alpha;&#150;h&eacute;lice a una de l&aacute;mina p.<sup>54,55 </sup>Asimismo, en 1999 Walsh y colaboradores<sup>56</sup> reportaron que los mon&oacute;meros y d&iacute;meros del A&beta; no son t&oacute;xicos para las c&eacute;lulas, mientras que olig&oacute;meros agregados de bajo peso molecular llamados protofibrillas s&iacute; lo son.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Iones met&aacute;licos y su interacci&oacute;n con el p&eacute;ptido &beta;&#150;amiloide</i></font></p>     <p align="justify"><font face="verdana" size="2">Diversos estudios indican que la presencia de iones met&aacute;licos puede ser fundamental tanto para la fibrilizaci&oacute;n del A&beta;, como para la iniciaci&oacute;n de la generaci&oacute;n de especies de ox&iacute;geno reactivas (ERO) relacionadas con el proceso de estr&eacute;s oxidativo.<sup>57,</sup><sup>58</sup> Mediante ensayos in vitro se conoce que en ausencia de estos iones met&aacute;licos, el A&beta; es monom&eacute;rico, presenta una conformaci&oacute;n a&#150;h&eacute;lice y no forma agregados.<sup>59</sup></font></p>     <p align="justify"><font face="verdana" size="2">Estudios epidemiol&oacute;gicos han sugerido una alta incidencia de la enfermedad de Alzheimer asociada con niveles ambientales elevados de Al<sup>3+</sup>, Zn<sup>2+</sup> y Fe<sup>3+</sup>.<sup>60</sup> Asimismo, se ha detectado un alto contenido de Al<sup>3+</sup>, Fe<sup>3+</sup>, Cu<sup>2+</sup> y Zn<sup>2+</sup> en el cerebro de pacientes con esta enfermedad.<sup>61</sup> La concentraci&oacute;n de estos iones met&aacute;licos puede estar incrementada entre 3 y 5 veces al compararse con la de cerebros de pacientes de la misma edad que no presentan esta patolog&iacute;a.<sup>62&#150;</sup><sup>65</sup> Se han detectado iones met&aacute;licos en el centro y la periferia de las placas seniles,<sup>66</sup> los que pueden ser t&oacute;xicos no s&oacute;lo por favorecer la generaci&oacute;n de ERO sino tambi&eacute;n estimulando directamente la formaci&oacute;n de fibrillas.<sup>38</sup> Mediante el uso de ensayos in vitro, se ha detectado que concentraciones traza de Fe<sup>3+</sup>, Al<sup>3+</sup> y Zn<sup>2+</sup> estimulan la agregaci&oacute;n del Ap entre 100 y 1000 veces.<sup>67</sup></font></p>     <p align="justify"><font face="verdana" size="2">Una amplia gama de sistemas generadores de radicales libres de ox&iacute;geno, enzim&aacute;ticos o no enzim&aacute;ticos, son capaces de catalizar modificaciones oxidativas de prote&iacute;nas cuando el Fe<sup>3+</sup> o el Cu<sup>2+</sup> est&aacute;n en presencia de O<sub>2</sub> y de un donador electr&oacute;nico apropiado.<sup>68</sup> La conversi&oacute;n de radicales O<sub>2</sub><i><sup>&#150;</sup> </i>y H<sub>2</sub>O<sub>2</sub> al radical hidroxilo (HO*) puede llevarse a cabo s&oacute;lo cuando est&aacute;n presentes metales de transici&oacute;n en concentraciones catal&iacute;ticas.<sup>69</sup></font></p>     <p align="justify"><font face="verdana" size="2">Bush y colaboradores en 1999<sup>41</sup> sugirieron que el Cu<sup>2+ </sup>juega un papel importante en el estr&eacute;s oxidativo producido por el A&beta;. Estos investigadores proponen que el Ap provee de un electr&oacute;n al Cu<sup>2+</sup> unido al p&eacute;ptido, formando Cu<sup>1+</sup>. Sin embargo, el Ap 1&#150;40, que tiene menor afinidad por el Cu<sup>2+</sup> y el 25&#150;35 que no presenta afinidad por este i&oacute;n, tambi&eacute;n son t&oacute;xicos.<sup>7,</sup><sup>70</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Atwood y colaboradores,<sup>38,</sup><sup>42</sup> han caracterizado al A&beta; como una metaloprote&iacute;na que une iones de elementos de transici&oacute;n por medio de tres histidinas (posiciones 6,13 y 14) y una tirosina (posici&oacute;n 10), localizadas en la parte hidrof&iacute;lica N&#150;terminal del p&eacute;ptido, adem&aacute;s de la metionina 35 en la regi&oacute;n lipof&iacute;lica C&#150;terminal.<sup>71&#150;</sup><sup>73</sup> Algunos estudios indican que los residuos de histidina son importantes para la agregaci&oacute;n del Ap, ya que la ausencia de histidinas,<sup>74</sup> o la modificaci&oacute;n de estos residuos, disminuye notablemente la agregaci&oacute;n del Ap promovida por el Cu<sup>2+</sup>, Zn<sup>2+</sup> o Fe<sup>3+</sup>.<sup>38</sup> Estos hallazgos pueden explicar la raz&oacute;n por la cual no se detectan dep&oacute;sitos de Ap en el cerebro de la rata, pues en &eacute;sta especie el A&beta; carece de histidinas.<sup>74</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por otra parte, los p&eacute;ptidos que pierden la metionina 35 tienen una baja capacidad de reducir al Cu<sup>2+</sup>. La sustituci&oacute;n de este residuo por otro amino&aacute;cido elimina la acci&oacute;n prooxidante del p&eacute;ptido 25&#150;35<sup>75</sup> y disminuye la oxidaci&oacute;n de prote&iacute;nas, as&iacute; como su neurotoxicidad.<sup>76</sup> Sin embargo, la presencia de la metionina 35 no es suficiente para explicar la actividad redox del p&eacute;ptido y su neurotoxicidad, ya que en la rata el A&beta; que posee la metionina 35 carece del sitio clave de uni&oacute;n a iones met&aacute;licos (histidina 13).</font></p>     <p align="justify"><font face="verdana" size="2">El grupo de Butterfield ha propuesto un modelo de estr&eacute;s oxidativo para explicar la neurotoxicidad del Ap basada en el residuo metionina 35. Este amino&aacute;cido est&aacute; asociado con la formaci&oacute;n de fibrillas y la generaci&oacute;n de estr&eacute;s oxidativo, lo cual se ha demostrado en ensayos in vitro en los que se ha sustituido este residuo por norleucina, un amino&aacute;cido del mismo tama&ntilde;o y la misma hidrofobicidad que la metionina, pero con un grupo &#150;CH<sub>2</sub> en lugar del &aacute;tomo de azufre del grupo tioeter de la metionina. Este cambio no provoca oxidaci&oacute;n de prote&iacute;nas o toxicidad en ensayos realizados con neuronas de hipocampo a&uacute;n en presencia de Cu<sup>2+</sup>.<sup>77</sup></font></p>     <p align="justify"><font face="verdana" size="2">La metionina 35 es el residuo m&aacute;s susceptible a la oxidaci&oacute;n in vivo, especialmente bajo condiciones de estr&eacute;s oxidativo.<sup>78</sup> El estudio de placas seniles que contienen al A&beta; 1&#150;40 muestra una gran proporci&oacute;n de metionina sulf&oacute;xido,<sup>79 </sup>y se conoce, por estudios de modelaje estructural, que la oxidaci&oacute;n de residuos de metionina altera significativamente la estructura secundaria de los mismos.<sup>80</sup> Particularmente la oxidaci&oacute;n de la metionina induce una estructura de l&aacute;mina p.<sup>10</sup> La raz&oacute;n por la que la metionina 35 confiere propiedades neurot&oacute;xicas al A&beta; es desconocida, sin embargo existe evidencia de que al parecer se necesitan trazas de iones met&aacute;licos para que esto suceda.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Radicales libres y estr&eacute;s oxidativo</i></font></p>     <p align="justify"><font face="verdana" size="2">Un radical libre es un &aacute;tomo o mol&eacute;cula, neutra o cargada, que contiene uno o m&aacute;s electrones desapareados, ya sea por p&eacute;rdida o ganancia de estos. La existencia de electrones desapareados incrementa la reactividad de la especie qu&iacute;mica, pues estos electrones tienden a aparearse con un electr&oacute;n libre de otro &aacute;tomo o mol&eacute;cula. La producci&oacute;n de radicales libres ocurre por la adici&oacute;n o remoci&oacute;n de un electr&oacute;n en una reacci&oacute;n de &oacute;xido&#150;reducci&oacute;n y se producen normalmente durante el metabolismo de la c&eacute;lula.<sup>81</sup></font></p>     <p align="justify"><font face="verdana" size="2">A pesar del da&ntilde;o que pueden producir los radicales libres, debe mencionarse que tienen funciones normales dentro del metabolismo celular tales como transducci&oacute;n de se&ntilde;ales y expresi&oacute;n g&eacute;nica, activaci&oacute;n de factores transcripcionales y protecci&oacute;n inmunol&oacute;gica.<sup>82</sup></font></p>     <p align="justify"><font face="verdana" size="2">El ox&iacute;geno (O<sub>2</sub>) es un elemento esencial para la vida, pero puede llegar a ser t&oacute;xico al formar especies reactivas de ox&iacute;geno (ERO). Estas son producto de la ruptura o de la excitaci&oacute;n del O<sub>2</sub>, como son el ox&iacute;geno at&oacute;mico (O), el ozono (O<sub>3</sub>) y el ox&iacute;geno en singulete (<sup>1</sup>O<sub>2</sub>). Otras est&aacute;n parcialmente reducidas como lo es el per&oacute;xido de hidr&oacute;geno (H<sub>2</sub>O<sub>2</sub>), el radical super&oacute;xido (O<sub>2</sub>) y el radical hidroxilo (HO*).<sup>83</sup> El <sup>1</sup>O<sub>2</sub> es muy reactivo y puede reaccionar con la mayor&iacute;a de mol&eacute;culas celulares.<sup>84</sup> El O<sub>2</sub> y el H<sub>2</sub>O<sub>2</sub> son poco reactivos, sin embargo ambos generan <sup>1</sup>O<sub>2</sub> y HO*, compuestos altamente t&oacute;xicos. Cuando el H<sub>2</sub>O<sub>2</sub> acepta un electr&oacute;n desapareado, que puede provenir de un metal de transici&oacute;n como el Fe<sup>2+</sup> o el Cu<sup>1+</sup>, forma HO* y HO (reacci&oacute;n de Fenton) (Fe<sup>2+ </sup>+ H<sub>2</sub>O<sub>2</sub> &#150;&#150;&#150;&gt; Fe<sup>3+</sup> + HO<sup>&bull;</sup> + HO ).</font></p>     <p align="justify"><font face="verdana" size="2">La toxicidad del O<sub>2</sub> y del H<sub>2</sub>O<sub>2</sub> depende en gran medida de la disponibilidad y la distribuci&oacute;n de estos metales de transici&oacute;n.<sup>85</sup> Adem&aacute;s de estas especies reactivas de ox&iacute;geno, pueden formarse otras de importancia biol&oacute;gica que se combinan con nitr&oacute;geno (ERN), como el mon&oacute;xido de nitr&oacute;geno u &oacute;xido n&iacute;trico (NO<sup>&bull;</sup>).<sup>86</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En los organismos aerobios, la producci&oacute;n de ERO y ERN se encuentra en equilibrio con los sistemas de defensa antioxidantes. Sin embargo, al romperse este equilibrio las especies reactivas aumentan, se producen da&ntilde;os al ADN, a prote&iacute;nas y a l&iacute;pidos, lo que se conoce como estr&eacute;s oxidativo. Estos da&ntilde;os pueden ser reversibles al ser reparados o al reemplazar a las mol&eacute;culas da&ntilde;adas. Sin embargo, si en la c&eacute;lula se producen especies reactivas en exceso, o bien, los sistemas antioxidantes de la c&eacute;lula no responden adecuadamente, la c&eacute;lula puede morir.<sup>83</sup></font></p>     <p align="justify"><font face="verdana" size="2">Existen varios sistemas de protecci&oacute;n en la c&eacute;lula que evitan el excesivo incremento de especies reactivas, entre los que se encuentran: la actividad de la super&oacute;xido dismutasa (SOD), la catalasa y la glutation peroxidasa (GSH peroxidasa). La super&oacute;xido dismutasa es una enzima mitocondrial que convierte al O<sub>2</sub> en H<sub>2</sub>O<sub>2</sub>. La glutation peroxidasa y la glutation reductasa trabajan en conjunto, siendo la GSH peroxidasa una enzima citos&oacute;lica que transforma al H<sub>2</sub>O<sub>2</sub> en dos mol&eacute;culas de glutation reducido (GSH) que ceden dos hidr&oacute;genos, lo cual promueve que se forme entre ellas un enlace disulfuro (GSSG). El glutation se regenera r&aacute;pidamente mediante la glutation reductasa en presencia de NADPH. Finalmente la catalasa, enzima confinada a los peroxisomas, destruye al H<sub>2</sub>O<sub>2</sub> por dismutaci&oacute;n. Existen adem&aacute;s otros sistemas de protecci&oacute;n que eliminan a los radicales libres como el &aacute;cido &uacute;rico, la bilirrubina y la alb&uacute;mina, cuya acci&oacute;n es inespec&iacute;fica y poco eficiente. Asimismo, las vitaminas C y E as&iacute; como los flavonoides son capaces de inactivar a los radicales libres.<sup>82</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Estr&eacute;s oxidativo y enfermedad Alzheimer</i></font></p>     <p align="justify"><font face="verdana" size="2">El cerebro es particularmente vulnerable al estr&eacute;s oxidativo ya que presenta una elevada tasa metab&oacute;lica derivada de la glucosa, posee niveles muy bajos de defensas antioxidantes, contiene altas concentraciones de &aacute;cidos grasos poliinsaturados, que son posible blanco de peroxidaci&oacute;n lip&iacute;dica, y adem&aacute;s es rico en actividades enzim&aacute;ticas relacionadas con metales de transici&oacute;n, los cuales pueden catalizar la formaci&oacute;n de radicales libres.<sup>87</sup></font></p>     <p align="justify"><font face="verdana" size="2">Aunque el mecanismo por el cual el A&beta; genera radicales libres en la enfermedad de Alzheimer no se conoce, se ha definido que estas especies reactivas causan peroxidaci&oacute;n de l&iacute;pidos, oxidaci&oacute;n de prote&iacute;nas y p&eacute;rdida de integridad de la membrana. Esto trae como consecuencia la inhibici&oacute;n de ATPasas, p&eacute;rdida de la homeostasis del calcio, inhibici&oacute;n del sistema de captura de glutamato dependiente de sodio en c&eacute;lulas gliales, alteraci&oacute;n de v&iacute;as de se&ntilde;alizaci&oacute;n, activaci&oacute;n de factores transcripcionales y finalmente apoptosis.<sup>88</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las evidencias que indican que la citotoxicidad del A&beta; es mediada a trav&eacute;s de radicales libres son variadas:</font></p>     <p align="justify"><font face="verdana" size="2">1) Concentraciones micromolares de A&beta; provocan un aumento en los niveles de H<sub>2</sub>O<sub>2</sub> en c&eacute;lulas en cultivo, sin embargo la presencia de catalasa o de SOD<sup>89</sup> previene la toxicidad del p&eacute;ptido.</font></p>     <p align="justify"><font face="verdana" size="2">2) C&eacute;lulas seleccionadas por su resistencia al A&beta; son tambi&eacute;n altamente resistentes al efecto del H<sub>2</sub>O<sub>2</sub> y contienen altos niveles del glutation.<sup>90</sup></font></p>     <p align="justify"><font face="verdana" size="2">3) Por otro lado, se han detectado niveles altos de ERO intracelulares en individuos con s&iacute;ndrome de Down que sobreexpresan al gen de la APP.<sup>91</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Aunque por mucho tiempo se ha pensado que el generador de ERO en la enfermedad de Alzheimer es exclusivamente el A&beta;, se ha planteado tambi&eacute;n la existencia de otras fuentes de radicales libres, tales como el Fe<sup>3+</sup>, que se encuentra incrementado en las mara&ntilde;as neurofibrilares y en los dep&oacute;sitos de A&beta;.<sup>92</sup> El Fe<sup>3+</sup>, cataliza la formaci&oacute;n de HO<sup>&bull;</sup> a partir de H<sub>2</sub>O<sub>2</sub>, as&iacute; como la formaci&oacute;n de productos de glucosilaci&oacute;n avanzada o AGE (Advanced Glycation End Products). Al<sup>3+</sup>por su parte, tambi&eacute;n se acumula en las mara&ntilde;as neurofibrilares,<sup>63 </sup>estimulando la peroxidaci&oacute;n lip&iacute;dica inducida por Fe<sup>3+</sup>.<sup>93</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por otra parte, la microglia activada que rodea las placas seniles<sup>94</sup> es una fuente de NO y O<sub>2</sub>,<sup>95</sup> los que a su vez pueden reaccionar para formar peroxinitrito (ONOO<sup>&#150;</sup>).<sup>96</sup> Los AGE en presencia de metales de transici&oacute;n pueden tambi&eacute;n producir especies reactivas.<sup>97</sup> Adem&aacute;s, tanto los AGE como el A&beta; pueden reconocer receptores demembrana espec&iacute;ficos tales como RAGE (Receptor&#150; Advanced Glycation End products) y RS (Receptor Scavenger), mecanismo que a su vez puede incrementar la producci&oacute;n de ERO.<sup>98</sup></font></p>     <p align="justify"><font face="verdana" size="2">A pesar de las controversias al respecto, es un hecho que el cerebro de pacientes con enfermedad de Alzheimer presenta un estado de estr&eacute;s oxidativo severo, detect&aacute;ndose un aumento en la peroxidaci&oacute;n de l&iacute;pidos, bajos niveles de &aacute;cidos grasos poliinsaturados (PUFA, Polyunsatured Fatty Acids) y un incremento en el 4&#150;hidroxinonenal (HNE), un producto aldeh&iacute;dico neurot&oacute;xico proveniente de la oxidaci&oacute;n de los PUFA. El HNE puede difundir desde el sitio de su producci&oacute;n, modificar organelos neuronales y alterar su funci&oacute;n.<sup>99</sup> El da&ntilde;o oxidativo que se presenta en el Alzheimer incluye AGE,<sup>100</sup> productos de nitrosilaci&oacute;n,<sup>96</sup> prote&iacute;nas de neurofilamentos carbonil&#150;modificadas y carbonilos libres.<sup>101</sup></font></p>     <p align="justify"><font face="verdana" size="2">Asimismo, existe un incremento en la oxidaci&oacute;n proteica y un aumento en la oxidaci&oacute;n del ADN detectado por niveles altos de su producto de degradaci&oacute;n, el 8&#150;hidroxi&#150;2'&#150;desoxiguanosina (8&#150;OHdG). El aumento de este &uacute;ltimo compuesto, sin embargo, no siempre se lleva a cabo, pues se han encontrado niveles muy bajos de 8&#150;OHdG en algunos casos de Alzheimer con grandes dep&oacute;sitos de A&beta;.<sup>102</sup> Estos hallazgos pueden parecen contradictorios, pero dan evidencia de que el A&beta; y las mara&ntilde;as neurofibrilares, pueden constituir una respuesta de la c&eacute;lula al estr&eacute;s oxidativo al tener funciones anti&#150;oxidantes, al menos en las etapas iniciales de la enfermedad.<sup>102</sup></font></p>     <p align="justify"><font face="verdana" size="2">Con respecto a la respuesta inmune, se sabe que en procesos normales de inflamaci&oacute;n se generan ERO que da&ntilde;an al tejido circundante. A pesar de que la inflamaci&oacute;n aguda, que incluye edema e invasi&oacute;n de neutr&oacute;filos no es caracter&iacute;stica de la enfermedad de Alzheimer,<sup>103</sup> existe evidencia de da&ntilde;o celular mediado por c&eacute;lulas del sistema inmune. Una evidencia que sustenta la posibilidad de un proceso inflamatorio en el cerebro de pacientes con enfermedad de Alzheimer, es el hecho de que una terapia basada en drogas anti&#150;inflamatorias no esteroideas trae beneficios cognitivos.<sup>104,</sup><sup>105</sup> Una fuente potencial importante de ERO en el cerebro es la microglia,<sup>106</sup> que de forma similar a los monocitos de la sangre o a los macr&oacute;fagos peritoneales, son c&eacute;lulas que una vez activadas presentan una actividad fagoc&iacute;tica alta.<sup>107</sup> La microglia activada in vitro produce O<sub>2</sub>~, lo cual sugiere que el A&beta; es indirectamente neurot&oacute;xico por la activaci&oacute;n de la microglia y la consecuente generaci&oacute;n de radicales libres.<sup>108</sup></font></p>     <p align="justify"><font face="verdana" size="2">La respuesta inflamatoria secundaria a la acci&oacute;n del A&beta; fue estudiada primeramente en macr&oacute;fagos peritoneales.<sup>109 </sup>En estas c&eacute;lulas, el A&beta; 25&#150;35 y el 1&#150;40 son capaces de estimular a la NADPH oxidasa, una fuente importante de O<sub>2</sub><sup>&#150;</sup>.<sup>110</sup> El p&eacute;ptido 1&#150;40 causa adem&aacute;s un incremento en la producci&oacute;n de NO. Asimismo, se ha detectado la formaci&oacute;n de NO en microglia<sup>111</sup> por un aumento en la actividad de la &oacute;xido n&iacute;trico sintasa causada por el p&eacute;ptido. El NO resultante puede reaccionar r&aacute;pidamente con el radical O<sub>2</sub><sup>&#150;</sup> que se produce en la mitocondria y formar ONOO<sup>&#150;</sup>. Adem&aacute;s, la exposici&oacute;n de microglia al A&beta; provoca un aumento en la expresi&oacute;n de varias interleucinas como TNF&#150;&alpha; y TGF&#150;&beta; entre otras sustancias moduladoras de las cascadas inmunes.<sup>112</sup></font></p>     <p align="justify"><font face="verdana" size="2">Por otra parte, se sabe que el metabolismo energ&eacute;tico de las neuronas est&aacute; deteriorado en cerebros afectados con la enfermedad de Alzheimer. La tomograf&iacute;a de emisi&oacute;n de positrones de pacientes con Alzheimer muestra una disminuci&oacute;n progresiva en el metabolismo de la glucosa en el cerebro y un menor flujo sangu&iacute;neo en los l&oacute;bulos parietal y temporal, que correlaciona con el grado de demencia de los pacientes.<sup>113</sup> La primera evidencia de una posible relaci&oacute;n entre el estr&eacute;s oxidativo y alteraciones en el transporte de glucosa fue encontrada por estudios de neuronas en cultivo, en los que se encontr&oacute; que el A&beta; altera la captura de glucosa, lo que causa a su vez un decremento en los niveles de ATP. Se ha sugerido que esto es provocado por la conjugaci&oacute;n HNE con la prote&iacute;na transportadora de glucosa, GLUT3.<sup>114</sup> Las alteraciones en el metabolismo de la glucosa en el cerebro limitan la s&iacute;ntesis de acetil&#150;colina, glutamato, aspartato, &aacute;cido&#150;y&#150;aminobut&iacute;rico (GABA), glicina y ATP.<sup>115</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>P&eacute;ptido &beta;&#150;amiloide y sus receptores</b></font></p>     <p align="justify"><font face="verdana" size="2">Se ha propuesto la existencia de receptores membranales espec&iacute;ficos que med&iacute;an la citotoxicidad inducida por el A&beta;,<sup>116 </sup>entre ellos RAGE.<sup>117,</sup><sup>118</sup> Este es un receptor de superficie celular relacionado con la producci&oacute;n intracelular de ERO, que puede inducir la migraci&oacute;n de microglia hacia dep&oacute;sitos de A&beta;.<sup>97,</sup><sup>98</sup> La prote&iacute;na x asociada a microt&uacute;bulos, es por ejemplo, blanco de la formaci&oacute;n de AGE intracelulares. Sin embargo, tambi&eacute;n existe evidencia de que la toxicidad del A&beta; puede ser independiente de este receptor, ya que no se ha encontrado al ARNm del RAGE en neuronas corticales o c&eacute;lulas PC12.<sup>119</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Otro de los receptores que ha sido implicado en la toxicidad del A&beta; es el receptor nombrado LRP (LDL Related Receptor Protein), que une diversos ligandos incluyendo quilomicrones, apolipoprote&iacute;na E y &alpha;2&#150;macroglobulina.<sup>120 </sup>&Eacute;sta &uacute;ltima es una prote&iacute;na cuya uni&oacute;n al A&beta; parece favorecer su internalizaci&oacute;n.<sup>121</sup> LRP puede unir e internalizar a APP soluble, as&iacute; como una isoforma no procesada amiloidog&eacute;nica, la cual a su vez puede llevar a la formaci&oacute;n de A&beta;.<sup>122</sup> Evidencia reciente indica que LRP de c&eacute;lulas de microglia puede jugar un papel importante como un receptor del A&beta;<sup>123</sup></font></p>     <p align="justify"><font face="verdana" size="2">Otro candidato es la glicoprote&iacute;na 330 (gp330/megalina), un receptor de membrana que pertenece a la familia de los receptores de LDL y que tiene m&uacute;ltiples ligandos entre los que se incluye a la apoJ. Este receptor ha sido implicado en el transporte a trav&eacute;s de la barrera hematoencef&aacute;lica del A&beta; formando un complejo con la apoJ.<sup>124</sup></font></p>     <p align="justify"><font face="verdana" size="2">Finalmente, existe evidencia de que el RS est&aacute; implicado en la internalizaci&oacute;n y toxicidad del A&beta;. El RS se expresa en c&eacute;lulas de glia y microglia y es capaz de internalizar al A&beta; en forma de agregados.<sup>125,</sup><sup>126</sup> Evidencia reciente muestra que el RS puede iniciar el da&ntilde;o mediado por inmunidad en la enfermedad de Alzheimer, hecho que es avalado por la fuerte expresi&oacute;n de este receptor asociado a la presencia de placas seniles.<sup>127</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Receptores "scavenger"</b></font></p>     <p align="justify"><font face="verdana" size="2">El RS constituye parte de una amplia familia de receptores de membrana que se caracterizan por su habilidad para internalizar LDL acetiladas y LDL oxidadas,<sup>128</sup> adem&aacute;s de una gran variedad de ligandos, muchos de ellos caracterizados por sus propiedades poliani&oacute;nicas.<sup>129</sup> Uno de los ligandos recientemente descritos para el RS&#150;A es la mol&eacute;cula paramiosina, una prote&iacute;na proveniente de <i>Taenia soleum, </i>que parece favorecer la formaci&oacute;n de arreglos tridimensionales del propio receptor, los que facilitan la formaci&oacute;n del pozo cubierto y la endocitosis del mismo.<sup>130</sup> El contenido de colesterol en la membrana plasm&aacute;tica, se ha observado tambi&eacute;n influye en la formaci&oacute;n de estos arreglos tridimensionales entre los receptores RS&#150;A,<sup>131</sup> m&aacute;s a&uacute;n, este arreglo tridimensional del RS&#150;A favorece la s&iacute;ntesis de prote&iacute;nas accesorias en el proceso de endocitosis.<sup>130</sup></font></p>     <p align="justify"><font face="verdana" size="2">El RS est&aacute; implicado en la generaci&oacute;n de c&eacute;lulas espumosas derivadas de macr&oacute;fagos y de la consecuente formaci&oacute;n de la placa ateroscler&oacute;tica en el sistema circulatorio. De igual forma, participa en funciones de inmunidad innata, eliminaci&oacute;n de c&eacute;lulas apopt&oacute;ticas, defensa del hospedero, transporte reverso del colesterol y adhesi&oacute;n celular. Este receptor se encuentra localizado a concentraciones importantes en macr&oacute;fagos y c&eacute;lulas afines como la microglia, as&iacute; como en hepatocitos, ovario, test&iacute;culo, gl&aacute;ndulas suprarrenales y astrocitos.<sup>132</sup></font></p>     <p align="justify"><font face="verdana" size="2">Un posible papel del RS&#150;A en la inducci&oacute;n de la enfermedad de Alzheimer ha sido sugerido por datos que muestran que este receptor puede promover la adhesi&oacute;n de fibrillas de A&beta; a c&eacute;lulas de microglia,<sup>133</sup> adem&aacute;s de poder mediar su endocitosis<sup>125</sup> y su degradaci&oacute;n.<sup>134,</sup><sup>135</sup> Asimismo, la expresi&oacute;n del RS&#150;A est&aacute; aumentada en la microglia de cerebros de pacientes con EA y en el cerebro de ratones transg&eacute;nicos que expresan una forma mutada de la prote&iacute;na precursora del A(3 (APP23) y los cuales desarrollan una patolog&iacute;a parecida a la de la enfermedad de Alzheimer.<sup>136</sup> El RS&#150;BI localizado en microglia neonatal tambi&eacute;n parece ser parte de la uni&oacute;n del A(3 a estas c&eacute;lulas y de la producci&oacute;n de ERO,<sup>137,</sup><sup>138</sup> adem&aacute;s de participar en la endocitosis del p&eacute;ptido.<sup>139,</sup><sup>140</sup></font></p>     <p align="justify"><font face="verdana" size="2">La interacci&oacute;n <i>in vitro </i>de fibras de A&beta; con microglia neonatal estimula a estas c&eacute;lulas a producir sustancias proinflamatorias y potencialmente neurot&oacute;xicas como lo son el &oacute;xido n&iacute;trico, el factor de necrosis tumoral &alpha; (TNF&#150;&alpha;), ERO, ERN, etc.<sup>126,</sup><sup>141</sup> Se ha encontrado que la remoci&oacute;n de c&eacute;lulas de microglia de cultivos mixtos de c&eacute;lulas nerviosas y fibras amiloides elimina casi totalmente el efecto t&oacute;xico de las fibrillas sobre las neuronas<sup>142</sup> sugiriendo que la microglia, y/ o mol&eacute;culas que &eacute;stas producen median los efectos neurot&oacute;xicos de las fibrillas del A&beta;.</font></p>     <p align="justify"><font face="verdana" size="2">El trabajo realizado en nuestro laboratorio muestra que la capacidad de internalizaci&oacute;n del RS&#150;A disminuye en condiciones de estr&eacute;s oxidativo extracelular.<sup>143</sup> La uni&oacute;n del ligando (LDL&#150;Ac), la expresi&oacute;n del RNAm&#150;RS&#150;A y la misma estructura del RS&#150;A no se modifican en condiciones de estr&eacute;s oxidativo extracelular, y sin embargo, el RS&#150;A no puede ser endocitado.<sup>143</sup> Por lo tanto, &iquest;cu&aacute;l es el mecanismo afectado que impide la internalizaci&oacute;n del receptor secundario a la presencia de estr&eacute;s oxidativo? Nuestros estudios utilizando al A&beta; como ligando del RS e inductor de estr&eacute;s oxidativo fisiol&oacute;gico demuestran que una de las m&uacute;ltiples prote&iacute;nas implicadas en el proceso de endocitosis mediada por clatrina (clatrina, &alpha;&#150; y &beta;&#150;adaptina, CALM, eps15), en espec&iacute;fico la &beta;&#150;adaptina disminuye de forma importante en c&eacute;lulas de microglia expuestas a este p&eacute;ptido (<a href="/img/revistas/gmm/v142n3/a9f3.jpg" target="_blank">Figura 3</a>). Esta disminuci&oacute;n asociada a una alteraci&oacute;n en la traducci&oacute;n de la prote&iacute;na coincide con la incapacidad de la c&eacute;lula para endocitar al A&beta;. La p&eacute;rdida en el nivel de concentraci&oacute;n cr&iacute;tica de esta prote&iacute;na, clave en la formaci&oacute;n del pozo cubierto y por tanto en la endocitosis, podr&iacute;a ayudar a explicar la acumulaci&oacute;n de agregados de A&beta; extracelular que se presentan en la enfermedad de Alzheimer.<sup>144</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Tomando en cuenta que la enfermedad de Alzheimer es un desorden neurodegenerativo complejo cuya patog&eacute;nesis no se conoce con exactitud, los hallazgos bioqu&iacute;micos y gen&eacute;ticos que se conocen hasta el momento solamente permiten entender parcialmente la muerte neuronal, por lo que continuar con el estudio de los factores tanto extra como intracelulares que controlan el proceso, sin duda mejorar&aacute; el conocimiento de la fisiopatolog&iacute;a de este padecimiento. De estos factores, el estr&eacute;s oxidativo localizado y en especial su repercusi&oacute;n sobre la traducci&oacute;n de prote&iacute;nas que participan en la formaci&oacute;n del pozo cubierto, parece constituir un nuevo elemento que deber&aacute; ser estudiado a profundidad en el af&aacute;n de entender mejor y poder alg&uacute;n d&iacute;a llegar a contrarrestar el desarrollo de la enfermedad.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Las investigaciones realizadas por los autores recibieron el apoyo de CONACYT y la DGAPA&#150;UNAM, M&eacute;xico. Agradecemos a la Maestra Blanca Delgado&#150;Coello su apoyo t&eacute;cnico y a la Sra. Ma. Elena Guti&eacute;rrez su apoyo secretarial.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1.<b> </b><b>Terry RD, Masliah E, Salmon DP, Butters N, De Teresa R, Hill R, et al. </b>Physical basis of cognitive alterations in Alzheimer's disease : synapse loss is the major correlate of cognitive impairment. Ann Neurol 1991; 30:572&#150;580.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3878953&pid=S0016-3813200600030000900001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2.<b> Durany N, Munch G, Michel T. </b>Investigations on oxidative stress and therapeutical implications in dementia. 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FASEB J 1991; 4:278&#150;286.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3878955&pid=S0016-3813200600030000900003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">4.<b> Glenner G, Wong CW. </b>Alzheimer's disease: initial report of the purification and characterization of a novel cerebrovascular amyloid protein. 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