<?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>1665-1146</journal-id>
<journal-title><![CDATA[Boletín médico del Hospital Infantil de México]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. Med. Hosp. Infant. Mex.]]></abbrev-journal-title>
<issn>1665-1146</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud, Hospital Infantil de México Federico Gómez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-11462006000300010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Síndrome de exceso de prostaglandina E en niños]]></article-title>
<article-title xml:lang="en"><![CDATA[The hyperprostaglandin E syndrome in children]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velásquez-Forero]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabeza Salinas]]></surname>
<given-names><![CDATA[Marisa]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos]]></surname>
<given-names><![CDATA[Rubén]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma Metropolitana-Xochimilco Departamento de Sistemas Biológicos ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Autónoma Metropolitana-Iztapalapa Departamento de Ciencias de la Salud ]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
</aff>
<aff id="A01">
<institution><![CDATA[,Hospital Infantil de México Federico Gómez Laboratorio de Metabolismo Mineral Óseo ]]></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>63</volume>
<numero>3</numero>
<fpage>208</fpage>
<lpage>220</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-11462006000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-11462006000300010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-11462006000300010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En 1997 Welch, identificó en un niño el síndrome de hiperprostaglandina E caracterizándolo por calcitriol elevado, hipercalciuria e hiperexcreción urinaria de prostaglandina (PG) E2. Se hipotetizó que el exceso de PG E, incrementaba la síntesis del calcitriol, aumentaba la absorción de Ca y ocasionaba hipercalciuria. En este trabajo se analiza la existencia del síndrome clínico reportado por Welch y se revisa la bibliografía experimental y clínica sobre la relación entre las PG de la serie E y la síntesis del calcitriol. Observaciones experimentales in vivo e in vitro y varias clínicas sugieren que las PG incrementan la síntesis del calcitriol. La revisión comprobó que las PG de la serie E incrementan la síntesis del calcitriol reproduciendo el síndrome de exceso de PG E. Esto ha sido poco mencionado. El síndrome de exceso de la PG E existe en niños. Este síndrome puede manifestarse como único o sobreimpuesto a otra enfermedad]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[In 1997, Welch identified in a child the hyperprostaglandin E syndrome, which is characterized by raised calcitriol, hypercalciuria and urinary hyperexcretion of PGE2. Welch hypothesized that hyperprostaglandin E increases the synthesis of calcitriol, increasing Ca absorption which causes hypercalciuria. In this work analyze the existence of the clinical syndrome reported by Welch. We review the experimental and clinical bibliography on the relationship between prostaglandins (PG) E and the calcitriol synthesis. Observations in vivo, in vitro and in many clinical studies, showed that PG E, increased the calcitriol synthesis. The review of medical literature proved that the PG E increases the synthesis of calcitriol and reproduces the hyperprostaglandin E syndrome. This has been rarely mentioned. The hyperprostaglandin E syndrome exists in children. This syndrome could be present as a unic entity or superimposed to other pathologies]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Síndrome de exceso de la prostaglandina E]]></kwd>
<kwd lng="es"><![CDATA[síntesis de calcitriol]]></kwd>
<kwd lng="es"><![CDATA[hipercalciuria]]></kwd>
<kwd lng="es"><![CDATA[prostaglandina E1 e hipercalcemias]]></kwd>
<kwd lng="en"><![CDATA[Hyperprostaglandin E syndrome]]></kwd>
<kwd lng="en"><![CDATA[calcitriol synthesis]]></kwd>
<kwd lng="en"><![CDATA[hypercalciuria]]></kwd>
<kwd lng="en"><![CDATA[prostaglandin E]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Tema pedi&aacute;trico</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>S&iacute;ndrome de exceso de prostaglandina E en ni&ntilde;os</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>The hyperprostaglandin E syndrome in children</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Dr. Francisco Vel&aacute;squez&#150;Forero<sup>1</sup>, Dra. Marisa Cabeza Salinas<sup>2</sup>, Dr. Rub&eacute;n Rom&aacute;n&#150;Ramos<sup>3</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>1 Laboratorio de Metabolismo Mineral &Oacute;seo, Hospital Infantil de M&eacute;xico Federico G&oacute;mez y Programa de Doctorado en Ciencias Biol&oacute;gicas, Universidad Aut&oacute;noma Metropolitana&#150;Xochimilco</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>2 Departamento de Sistemas Biol&oacute;gicos, Universidad Aut&oacute;noma Metropolitana&#150;Xochimilco</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>3 Departamento de Ciencias de la Salud, Universidad Aut&oacute;noma Metropolitana&#150;Iztapalapa, </i><i>M&eacute;xico, D. F., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Solicitud de sobretiros:    <br> </b><i>Dr. Francisco Vel&aacute;squez Forero    <br> Laboratorio de Metabolismo Mineral &Oacute;seo Hospital Infantil de M&eacute;xico Federico G&oacute;mez    <br> Edif. Mundet 3er. Piso, Calle Dr. M&aacute;rquez 162, Col. Doctores, Deleg. Cuauhtemoc, C. P. 06720, M&eacute;xico, D. F., M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Fecha de recepci&oacute;n: 11&#150;11 &#150;2005    <br>   Fecha de aprobaci&oacute;n: 01&#150;08&#150;2006</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">En 1997 Welch, identific&oacute; en un ni&ntilde;o el s&iacute;ndrome de hiperprostaglandina E caracteriz&aacute;ndolo por calcitriol elevado, hipercalciuria e hiperexcreci&oacute;n urinaria de prostaglandina (PG) E<sub>2</sub>. Se hipotetiz&oacute; que el exceso de PG E, incrementaba la s&iacute;ntesis del calcitriol, aumentaba la absorci&oacute;n de Ca y ocasionaba hipercalciuria.</font></p>     <p align="justify"><font face="verdana" size="2">En este trabajo se analiza la existencia del s&iacute;ndrome cl&iacute;nico reportado por Welch y se revisa la bibliograf&iacute;a experimental y cl&iacute;nica sobre la relaci&oacute;n entre las PG de la serie E y la s&iacute;ntesis del calcitriol.</font></p>     <p align="justify"><font face="verdana" size="2">Observaciones experimentales <i>in vivo </i>e <i>in vitro </i>y varias cl&iacute;nicas sugieren que las PG incrementan la s&iacute;ntesis del calcitriol.</font></p>     <p align="justify"><font face="verdana" size="2">La revisi&oacute;n comprob&oacute; que las PG de la serie E incrementan la s&iacute;ntesis del calcitriol reproduciendo el s&iacute;ndrome de exceso de PG E. Esto ha sido poco mencionado.</font></p>     <p align="justify"><font face="verdana" size="2">El s&iacute;ndrome de exceso de la PG E existe en ni&ntilde;os. Este s&iacute;ndrome puede manifestarse como &uacute;nico o sobreimpuesto a otra enfermedad.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave.</b> S&iacute;ndrome de exceso de la prostaglandina E; s&iacute;ntesis de calcitriol; hipercalciuria; prostaglandina E<sub>1</sub> e hipercalcemias.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">In 1997, Welch identified in a child the hyperprostaglandin E syndrome, which is characterized by raised calcitriol, hypercalciuria and urinary hyperexcretion of PGE<sub>2</sub>. Welch hypothesized that hyperprostaglandin E increases the synthesis of calcitriol, increasing Ca absorption which causes hypercalciuria.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">In this work analyze the existence of the clinical syndrome reported by Welch.</font></p>     <p align="justify"><font face="verdana" size="2">We review the experimental and clinical bibliography on the relationship between prostaglandins (PG) E and the calcitriol synthesis.</font></p>     <p align="justify"><font face="verdana" size="2">Observations <i>in vivo, in vitro </i>and in many clinical studies, showed that PG E, increased the calcitriol synthesis.</font></p>     <p align="justify"><font face="verdana" size="2">The review of medical literature proved that the PG E increases the synthesis of calcitriol and reproduces the hyperprostaglandin E syndrome. This has been rarely mentioned.</font></p>     <p align="justify"><font face="verdana" size="2">The hyperprostaglandin E syndrome exists in children. This syndrome could be present as a unic entity or superimposed to other pathologies.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words.</b> Hyperprostaglandin E syndrome; calcitriol synthesis; hypercalciuria; prostaglandin E.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Con los avances de las &uacute;ltimas d&eacute;cadas en el estudio de las enfermedades metab&oacute;licas &oacute;seas, hoy se cuenta con amplia evidencia de que las prostaglandinas (PG) desempe&ntilde;an un papel fisiol&oacute;gico importante en el metabolismo del tejido &oacute;seo, pero a&uacute;n se conoce poco acerca de la producci&oacute;n de PG <i>in vivo </i>por el esqueleto.</font></p>     <p align="justify"><font face="verdana" size="2">En 1997, Welch<sup>1</sup> identific&oacute; el s&iacute;ndrome de exceso de PG E (SEPGE) en un ni&ntilde;o, caracterizado por polihidramnios, prematurez, alcalosis y nefrocalcinosis, bioqu&iacute;micamente caracterizado por paratohormona (PTH) normal, elevaci&oacute;n del calcitriol s&eacute;rico, hipercalciuria e hiperexcreci&oacute;n de PGE<sub>2</sub> en orina. &Eacute;l consider&oacute; esta entidad como una variante del s&iacute;ndrome de Bartter (hipocalemia, alcalosis, hiperreninemia y normotensi&oacute;n), ya que aproximadamente una d&eacute;cada antes hab&iacute;a detectado hipercalciuria en algunos ni&ntilde;os con este s&iacute;ndrome.<sup>2</sup> Los autores del presente estudio en su laboratorio han desarrollado<sup>3,4</sup> un modelo experimental <i>in vivo </i>e <i>in vitro </i>con conejos en el cual se observ&oacute; (en ambos experimentos) que al agregar PGE<sub>1</sub> hab&iacute;a un incremento significativo en la s&iacute;ntesis del calcitriol, con caracter&iacute;sticas semejantes a los producidos al agregar PGE<sub>2</sub> en cultivo de r&iacute;&ntilde;ones de pollo.<sup>5</sup><sup>,6</sup> Hoy se acepta que la actividad de las PG ocurre a trav&eacute;s de receptores celulares espec&iacute;ficos, habiendo sido varios de ellos identificados y clonados.<sup>7&#150;15</sup></font></p>     <p align="justify"><font face="verdana" size="2">El calcitriol es una de las principales hormonas que regula el metabolismo del calcio (Ca) y del f&oacute;sforo (P) en el organismo; su s&iacute;ntesis aumenta principalmente por la activaci&oacute;n de la enzima 1&#150;&alpha;Hidroxilasa (1&alpha;&#150;OHasa), en situaciones como el crecimiento, el embarazo, la lactancia o cuando el aporte dietario de calcio y de f&oacute;sforo es deficiente.<sup>1618</sup> En este &uacute;ltimo, el incremento en la s&iacute;ntesis del calcitriol es a trav&eacute;s de un mecanismo independiente de la PTH.<sup>19</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El prop&oacute;sito de esta revisi&oacute;n es analizar la existencia del s&iacute;ndrome cl&iacute;nico reportado por Welch,<sup>1</sup> caracterizado por un exceso de PGE<sub>2</sub> en ni&ntilde;os, con base en estudios relacionados con modelos experimentales y con algunas observaciones en humanos.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Origen y estructura de las PG</b></font></p>     <p align="justify"><font face="verdana" size="2">Las PG y el tromboxano son conocidos como prostanoides y son el producto de la acci&oacute;n de la enzima fosfolipasa A<sub>2</sub> sobre los &aacute;cidos grasos no saturados de 20 carbonos que se localizan en las membranas celulares. Estos compuestos m&aacute;s tarde se convierten en otros prostanoides por la acci&oacute;n de la ciclooxigenasa y sus respectivas sintetasas dentro de las c&eacute;lulas, para de inmediato liberarse extracelularmente.<sup>7,8</sup></font></p>     <p align="justify"><font face="verdana" size="2">La estructura de las PG est&aacute; compuesta por un anillo ciclopentano y dos cadenas alif&aacute;ticas, las modificaciones del anillo ciclopentano permiten clasificarlas de la A a la I, siendo la A, B y C no naturales.<sup>8</sup> Las PG PGG<sub>1</sub> y PGH<sub>1</sub> comparten la estructura del mismo anillo ciclopentano, pero difieren en que por medio de la catalizaci&oacute;n de la ciclooxigenasa se agrega al carbono 15 un grupo hidroxy&#150;peroxy o un grupo hidroxy, respectivamente <a href="/img/revistas/bmim/v63n3/a10f1.jpg" target="_blank">(Fig. 1)</a>. La PGH<sub>1</sub> bajo la acci&oacute;n catal&iacute;tica de una sintetasa espec&iacute;fica reduce el carbono 11 y agrega un radical ceto en el carbono 9 para originar la PGE<sub>1</sub> <a href="/img/revistas/bmim/v63n3/a10f1.jpg" target="_blank">(Fig. 1)</a>. En forma semejante, una ciclooxigenasa act&uacute;a sobre el &aacute;cido araquid&oacute;nico y forma un anillo ciclopentano y la PGG<sub>2</sub> y PGH<sub>2</sub>, que comparten la misma estructura pero difieren por la catalizaci&oacute;n de la ciclooxigenasa que le agrega al carbono 15 un grupo hidroxy&#150;peroxy y un grupo hidroxy, respectivamente <a href="/img/revistas/bmim/v63n3/a10f2.jpg" target="_blank">(Fig. 2)</a>. Sobre la PGH<sub>2</sub> act&uacute;a una sintetasa que reduce el carbono 11 y agrega un radical ceto en el carbono 9 para formar la PGE<sub>2</sub> <a href="/img/revistas/bmim/v63n3/a10f2.jpg" target="_blank">(Fig. 2)</a>.</font></p>     <p align="justify"><font face="verdana" size="2">Las PG tambi&eacute;n se han clasificado con base al n&uacute;mero de dobles enlaces en las cadenas alif&aacute;ticas en tres series: 1, 2 y 3. Las PG de la serie 1 se sintetizan a partir del &aacute;cido homo&#150;&gamma;&#150;linol&eacute;nico (8, 11, 14&#150;eicosatrienoico) como se muestra en la<a href="/img/revistas/bmim/v63n3/a10f1.jpg" target="_blank"> figura 1</a>. Los de la serie 2 se originan del &aacute;cido araquid&oacute;nico <a href="/img/revistas/bmim/v63n3/a10f2.jpg" target="_blank">(Fig. 2)</a> (5, 8, 11, 14&#150;eicosatetranoico) y los de la serie 3, a partir del &aacute;cido eicosapentanoico (5, 8, 11, 14, 17&#150;eicosapentanoico). En los mam&iacute;feros las derivadas del &aacute;cido araquid&oacute;nico son las m&aacute;s abundantes.<sup>8</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Receptores de las PG</b></font></p>     <p align="justify"><font face="verdana" size="2">Las PG fueron consideradas como compuestos hidrof&oacute;bicos, que penetraban las membranas celulares alterando el fluido lipo&iacute;dico de &eacute;stas.<sup>20</sup> Hoy se sabe que esto no es as&iacute;, sino que cada prostanoide tiene un perfil &uacute;nico de actividad que no se superpone a otros, lo cual indica que individualmente su sitio de acci&oacute;n es espec&iacute;fico. Esto se hizo aparente al desarrollar bioensayos que permitieron comparar en varios tejidos las potencialidades de diferentes prostanoides y de sus an&aacute;logos. Siguiendo esta l&iacute;nea y tambi&eacute;n con estudios bioqu&iacute;micos y de radioinmunoan&aacute;lisis, se observ&oacute; la presencia de m&uacute;ltiples receptores para los prostanoides en diferentes tejidos y c&eacute;lulas,<sup>21&#150;23</sup> que culmin&oacute; en 1982 con la elaboraci&oacute;n de una clasificaci&oacute;n.<sup>9&#150;24</sup> En ella se propuso la presencia espec&iacute;fica de receptores para TX, PGI, PGE, PGF y PGD, y nombraron como P al receptor de cada uno de los prostanoides, posponiendo esta letra a la del nombre que identifica a cada una de ellas as&iacute;: TP, IP, EP, FP y DP. Posteriormente clasificaron el EP en 4 subtipos: EP<sub>1</sub> EP<sub>2</sub>, EP<sub>3</sub> y EP<sub>4</sub>.<sup>9</sup><sup>,25</sup> Estos subtipos de receptores responden a agonistas naturales de la PGE<sub>2</sub>, pero responden en forma diferente a varios an&aacute;logos o algunos otros ligandos.La localizaci&oacute;n cromos&oacute;mica de la mayor&iacute;a de los genes que codifican los receptores en ratones y humanos est&aacute; definida. Los genes que codifican en humanos los receptores EP<sub>1</sub>,EP<sub>3</sub>, EP<sub>4</sub>, FP, IP y TP est&aacute;n mapeados en los cromosomas 19p 13.1, 1p31.2, 5p13.1, 1p31.1, 19q13.3 y 19p13.3 respectivamente.<sup>26,27</sup></font></p>     <p align="justify"><font face="verdana" size="2"><i>Propiedades y localization de los receptores de los prostanoides</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Seg&uacute;n la transducci&oacute;n de la se&ntilde;al a la que se encuentran acoplados y de sus acciones, los receptores de los prostanoides se agrupan en tres categor&iacute;as: 1. Receptores relajantes que incrementan su efecto mediante el aumento del cAMP e inducen la relajaci&oacute;n del m&uacute;sculo liso (ejemplos: TP, DP, EP<sub>2</sub> y EP<sub>4</sub>); 2. Receptores de tipo contr&aacute;ctil, los cuales movilizan Ca<sup>2+</sup> y producen la contracci&oacute;n del m&uacute;sculo liso (ejemplos: IP, FP y EP1); y 3. Receptores inhibidores, que act&uacute;an disminuyendo el cAMP e inhiben la relajaci&oacute;n del m&uacute;sculo liso (ejemplo: EP<sub>3</sub>).<sup>28&#150;33</sup></font></p>     <p align="justify"><font face="verdana" size="2">Desde hace aproximadamente tres d&eacute;cadas se sabe que las PG juegan un papel importante en el metabolismo del tejido &oacute;seo.<sup>34,35</sup> La interleucina1 (IL&#150;1) y TNF&alpha; son estimuladores de la formaci&oacute;n de PGE<sub>2</sub> en la c&eacute;lula &oacute;sea.<sup>36</sup><sup>,37</sup> TGF&alpha; y TGF&beta; son reguladores de la citodiferenciaci&oacute;n y crecimiento celular y pueden estimular la producci&oacute;n de PG en c&eacute;lulas &oacute;seas a trav&eacute;s de la sintetasa (PGHS).<sup>38</sup> Tambi&eacute;n se observa incremento de las PG con la PTH.<sup>39,40</sup> La fuerza mec&aacute;nica sobre el tejido &oacute;seo intacto incrementa la producci&oacute;n de PG.<sup>41,42</sup> En cultivo de c&eacute;lulas &oacute;seas provenientes de ratas oforectomizadas se incrementa la producci&oacute;n de PG<sup>43,44 </sup><i> </i>por incremento en la actividad de la PGHS&#150;2.<sup>43,</sup><sup>45</sup> Las PG de la serie E son de las m&aacute;s potentes activadoras de la resorci&oacute;n &oacute;sea.<sup>34</sup> Recientemente se demostr&oacute; que la PGE<sub>1</sub> y la PGE<sub>2 </sub>estimulan la citodiferenciaci&oacute;n de c&eacute;lulas parecidas a los osteoclastos en cultivos de c&eacute;lulas &oacute;seas de m&uacute;ridos.<sup>46,</sup><sup>47</sup> Hay observaciones que sugieren que la PGI<sub>2</sub> es producida principalmente por los osteocitos, mientras que la PGE<sub>2</sub> se produce principalmente en los osteoblastos.<sup>48,49</sup></font></p>     <p align="justify"><font face="verdana" size="2">La PGE<sub>2</sub> estimula la formaci&oacute;n de osteoclastos en cultivos de m&eacute;dula &oacute;sea<sup>46</sup><sup>,47</sup> y lo hace a trav&eacute;s de los receptores EP<sub>4</sub> y EP<sub>2</sub>.<sup>50</sup><sup>&#150;53</sup> Entre los receptores de PGE<sub>2</sub>, el EP<sub>4</sub>, que activa a la adenilciclasa, parece ser el receptor que tiene efecto sobre la resorci&oacute;n &oacute;sea.<sup>54</sup> El efecto anab&oacute;lico de las PG sobre el tejido &oacute;seo es una propiedad importante ya que se tienen pocos medicamentos con estas caracter&iacute;sticas. La administraci&oacute;n prolongada de PGE<sub>1</sub> en ni&ntilde;os con malformaciones cardiacas produce hiperostosis cortical.<sup>55</sup> En perros, la administraci&oacute;n de PGE<sub>2</sub> estimula la formaci&oacute;n &oacute;sea.<sup>56 </sup>La osteopenia que ocasiona la ciclosporina "A" en ratas, se corrige al administrarla combinada con PGE<sub>2</sub>.<sup>57</sup> Estudios experimentales <i>in vivo </i>han demostrado que la administraci&oacute;n de PG estimula la formaci&oacute;n &oacute;sea endosteal y periosteal nuevas<sup>57</sup><sup>&#150;60 </sup>y tambi&eacute;n acelera la formaci&oacute;n de callo en las fracturas &oacute;seas.<sup>61</sup> El efecto anab&oacute;lico sobre el tejido &oacute;seo de las PG depende de su efecto mitog&eacute;nico y del est&iacute;mulo hacia la citodiferenciaci&oacute;n osteobl&aacute;stica;<sup>62</sup> esta propiedad anab&oacute;lica &oacute;sea puede ser aprovechada terap&eacute;uticamente al administrar PG en pacientes con enfermedades osteop&eacute;nicas.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Origen y estructura del calcitriol y de sus an&aacute;logos</b></font></p>     <p align="justify"><font face="verdana" size="2">La vitamina D existe como ergocalciferol (vitamina D<sub>2</sub>) producida en plantas,<sup>63</sup> o colecalciferol (vitamina D<sub>3</sub>) producida en tejidos animales por acci&oacute;n de radiaci&oacute;n ultravioleta (290&#150;330 nm) sobre el 7&#150;dehidrocolesterol en la piel humana.<sup>64</sup> Ambas vitaminas D son biol&oacute;gicamente inactivas (prohormonas), que deben hidroxilarse en los carbonos&#150;25 y 1 antes de unirse al receptor de la vitamina D <a href="/img/revistas/bmim/v63n3/a10f3.jpg" target="_blank">(Fig. 3)</a>. La 25 hidrolizaci&oacute;n de la vitamina D ocurre en el h&iacute;gado catalizada por el citocromo enzim&aacute;tico mitocondrial P450 (P450C25), dando origen a la hidroxivitamina &#91;25(OH)D&#93; que es el metabolito m&aacute;s abundante de la vitamina D, proveniente de la dieta y por la exposici&oacute;n a la luz solar.<sup>65</sup> En t&uacute;bulos renales proximales, la 25(OH)D<sub>3 </sub>sufre una 1&alpha;&#150;hidroxilaci&oacute;n produciendo la 1,25(OH)<sub>2</sub>D<sub>3</sub> que es hasta hoy el metabolito m&aacute;s activo de la vitamina D<sup>66&#150;68</sup> <a href="/img/revistas/bmim/v63n3/a10f3.jpg" target="_blank">(Fig. 3)</a>.</font></p>     <p align="justify"><font face="verdana" size="2">El calcitriol (1,25&#91;OH&#93;<sub>2</sub>D<sub>3</sub>) juega un papel central en la homeostasis del Ca y del P, promoviendo su absorci&oacute;n a nivel intestinal, para mantener su concentraci&oacute;n plasm&aacute;tica a niveles suficientes para el crecimiento y mineralizaci&oacute;n &oacute;sea. Estos efectos cl&aacute;sicos se llevan a cabo por acci&oacute;n del calcitriol sobre c&eacute;lulas blanco en intestino, hueso, ri&ntilde;ones y gl&aacute;ndulas paratiroideas. Los receptores del calcitriol (VDR) han sido identificados en varios tejidos: piel, esqueleto, tracto&#150;digestivo, sistema nervioso, sistema inmune, vasos, coraz&oacute;n, pulmones y otros &oacute;rganos.<sup>69</sup><sup>&#150;74</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los niveles s&eacute;ricos de calcitriol reflejan su s&iacute;ntesis en el ri&ntilde;on, siendo la productividad de la 1&alpha;<i>&#150;</i>hidroxilasa el marcador limitante para la actividad de la vitamina D. Su actividad est&aacute; regulada por la PTH, Ca, P y por la misma 1,25&#91;OH&#93;<sub>2</sub>D<sub>3</sub>.</font></p>     <p align="justify"><font face="verdana" size="2">Hoy se ha observado actividad de la 1&alpha;&#150;hidroxilasa en otros tejidos como en los keratocitos,<sup>75 </sup>macr&oacute;fagos<sup>76</sup> y en las c&eacute;lulas trofobl&aacute;sticas de la placenta.<sup>77</sup></font></p>     <p align="justify"><font face="verdana" size="2">Otra enzima en el metabolismo de la vitamina D, que puede hidroxilizar la 25 OHD, es la 24&#150;hidroxilasa (encontrada en varios tejidos).<sup>78</sup> Esta enzima puede catalizar la 24&#150;hidroxilaci&oacute;n de 25 OHD a 24, 25(OH)D<sub>3</sub> y tambi&eacute;n en la 1,25(OH)<sub>2</sub>D<sub>3</sub> a 1,24,25 (OH)<sub>3</sub>D<sub>3</sub> <a href="/img/revistas/bmim/v63n3/a10f3.jpg" target="_blank">(Fig. 3)</a>. Estos dos metabolitos pueden ser iniciadores de la inactivaci&oacute;n del calcitriol. En 1990, el gene de la 25&#150;hidroxilasa fue clonado y purificado en las c&eacute;lulas hep&aacute;ticas de rata.<sup>79,80</sup> En 1991 el gene que codifica a la 24&#150;hidroxilasa fue tambi&eacute;n clonado y purificado de las mitocondrias de c&eacute;lulas renales de la rata.<sup>81&#150;83</sup> En 1997, cuatro grupos de investigadores simult&aacute;neamente clonaron el gene que codifica a la 1&alpha;&#150;hidroxilasa<sup>76</sup><sup>,84&#150;87</sup> pero hasta la fecha no ha sido posible purificar la enzima (1&alpha;&#150;hidroxilasa) .<sup>75</sup> En la actualidad se mide la actividad de la 1&alpha;&#150;hidroxilasa en forma indirecta, en ensayos que la cuantifican relacion&aacute;ndola con la cantidad de calcitriol producido.<sup>88,89</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El calcitriol ejerce su acci&oacute;n sobre blancos celulares a trav&eacute;s de v&iacute;as moleculares. Se han identificado dos v&iacute;as que son mediadoras de la acci&oacute;n de la vitamina D: una v&iacute;a gen&oacute;mica ejerciendo una acci&oacute;n con el receptor de la vitamina D (VDR)<sup>90&#150;93</sup> y otra v&iacute;a no gen&oacute;mica en la que su acci&oacute;n se ejerce sobre un receptor localizado en la superficie celular.<sup>94</sup><sup>&#150;97</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se observa incremento del calcitriol s&eacute;rico en pacientes con hipocalcemias, hipofosfatemias, hiperparatiroidismo, intoxicaci&oacute;n ex&oacute;gena de vitamina D y en terapia con furosemide, y ahora su incremento s&eacute;rico es un marcador importante del SEPGE en ni&ntilde;os.<sup>1,2</sup> Experimentalmente, en cultivo de c&eacute;lulas tubulares renales de pollos y conejos, se ha observado que al agregar PGE<sub>2 </sub>y PGE<sub>1</sub> se estimula la actividad de la 1&alpha;&#150;hidroxilasa, incrementando la s&iacute;ntesis del calcitriol.<sup>3&#150;</sup> <sup>6</sup> El calcitriol tiene importantes aplicaciones terap&eacute;uticas en varias enfermedades graves.<sup>98&#150;113</sup> Desafortunadamente, este potencial terap&eacute;utico del calcitriol se ha visto limitado debido a la hipercalcemia t&oacute;xica que ocasiona. En las &uacute;ltimas d&eacute;cadas se han desarrollado an&aacute;logos de la vitamina D, que han disminuido significativamente la hipercalcemia t&oacute;xica, conservando sus propiedades terap&eacute;uticas.<sup>114&#150;119</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Aspectos cl&iacute;nicos y bioqu&iacute;micos del s&iacute;ndrome</b></font></p>     <p align="justify"><font face="verdana" size="2">Welch<sup>1</sup> y Restrepo y col.<sup>2</sup> observaron en algunos ni&ntilde;os con s&iacute;ndrome de Bartter (hipocalemia, alcalosis, hiperreninenemia, aldosteronismo y normotensi&oacute;n) datos de hipercalciuria y excreci&oacute;n urinaria elevada de PG.<sup>120</sup> Subsecuentemente se reportan varios casos de s&iacute;ndrome de Bartter asociados a hipercalciuria, hidramnios y prematurez.<sup>2,121,122</sup> M&aacute;s adelante aparecen reportes en los que la hipercalciuria en ni&ntilde;os con s&iacute;ndrome de Bartter, se reduce al aplicar inhibidores de las PG del tipo de la indometacina, sin explicaci&oacute;n clara para su causa. <sup>2,120,122</sup>  En 1975, Seyberth y col.<sup>123 </sup>informan de seis pacientes con tumores s&oacute;lidos del tipo carcinoma que presentaron hipercalcemia y excreci&oacute;n elevada de metabolitos de la PGE en la orina, que desaparecieron con tratamiento de inhibidores de las PG (aspirina, indometacina). En 1984, Houser y col.<sup>124</sup> encuentran un ni&ntilde;o con una entidad parecida al s&iacute;ndrome de Bartter con hipercalciuria y excreci&oacute;n urinaria elevada de PGE<sub>2</sub>, que se corrigi&oacute; con terapia inhibidora de las PG.</font></p>     <p align="justify"><font face="verdana" size="2">En 1985, Seyberth y col.<sup>120</sup> mencionan que la hipocalemia con hipercalciuria e hiperprostaglandinuria en ni&ntilde;os prematuros, es un s&iacute;ndrome diferente al s&iacute;ndrome de Bartter, ya que la suspensi&oacute;n de la actividad de la PGE<sub>2</sub> con indometacina, mejora significativamente a los ni&ntilde;os afectados.</font></p>     <p align="justify"><font face="verdana" size="2">En 1989, Restrepo y col.<sup>2</sup> observan en seis ni&ntilde;os con s&iacute;ndrome de Bartter con hipercalciuria e incremento en la excreci&oacute;n urinaria de PGE<sub>2</sub>, nefrocalcinosis sin datos de raquitismo ni de hiperparatiroidismo. Todos presentaron altos niveles s&eacute;ricos de calcitriol y respondieron a la terapia con inhibidores de las PG. Los estudios metab&oacute;licos del calcio en estos ni&ntilde;os sugieren que la hipercalciuria es por exceso de absorci&oacute;n intestinal de calcio. Estos autores concluyen que la asociaci&oacute;n de hipercalcemia e hipercalciuria al s&iacute;ndrome de Bartter es debida a anormalidades de la vitamina D.</font></p>     <p align="justify"><font face="verdana" size="2">A fines de 1997, por primera vez Welch<sup>1</sup> reporta en un ni&ntilde;o pre&#150;p&uacute;ber el s&iacute;ndrome caracterizado por exceso de PGE con hipercalciuria, y lo considera una variante del s&iacute;ndrome de Bartter. El embarazo hab&iacute;a presentado polihidramios, parto prematuro y estadio perinatal sin complicaciones, excepto por p&eacute;rdida de electrolitos que requer&iacute;an suplementos de sodio y cloruro de potasio, con frecuentes deshidrataciones y alteraciones metab&oacute;licas del tipo de la hipocalemia con alcalosis, elevaci&oacute;n en la actividad de la renina y de la aldosterona plasm&aacute;tica, diuresis hipot&oacute;nica con disminuci&oacute;n de la absorci&oacute;n del cloro en t&uacute;bulos renales distales, con acentuadas hipercalcemias e hipercalciurias. Los niveles plasm&aacute;ticos de PTH (mol&eacute;cula media), fueron normales pero los niveles s&eacute;ricos del calcitriol siempre fueron elevados, as&iacute; como la excreci&oacute;n urinaria de PGE<sub>2</sub>. Una electrosonograf&iacute;a renal revela nefrocalcinosis, el estudio radiogr&aacute;fico &oacute;seo no muestra raquitismo, pero s&iacute; osteopenia. Con todos estos datos, se estableci&oacute; el diagn&oacute;stico de SEPGE <a href="#c1">(Cuadro 1)</a> en un paciente con s&iacute;ndrome de Bartter manifestado desde la edad perinatal. Se inicia terapia a base de indometacina y cloruro de potasio durante 10 a&ntilde;os, con lo cual los niveles de calcitriol, calcemia y calciuria permanecen dentro de valores normales. Estas anormalidades reaparecen al descontinuar la indometacina. El ni&ntilde;o se ubica en el percentil 25 tanto en talla como en peso. Welch<sup>1 </sup>comenta que las alteraciones del Ca en este ni&ntilde;o se deben al incremento del calcitriol al estimular la absorci&oacute;n intestinal del Ca y al incremento de la resorci&oacute;n &oacute;sea local por la PG. Tambi&eacute;n menciona que <i>in vitro se </i>observa que la PGE<sub>2</sub> estimula la actividad de 1&alpha;&#150;OHasa, incrementando la producci&oacute;n del calcitriol, de tal manera que la PGE<sub>2 </sub>podr&iacute;a estar alterando el metabolismo del Ca a trav&eacute;s de ambos mecanismos.<sup>3</sup><sup>&#150;6</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="c1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v63n3/a10c1.jpg"></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Casi simult&aacute;neamente al reporte de Welch,<sup>1</sup> un grupo de investigadores encontraron en 20 ni&ntilde;os con "hipercalciuria idiop&aacute;tica" un incremento de la PGE<sub>2</sub> en orina, con un aumento simult&aacute;neo del calcitriol s&eacute;rico y con una PTH normal. Ellos sugieren que la PGE<sub>2</sub> juega un papel importante en la patog&eacute;nesis de la hipercalciuria, ya que incrementa la s&iacute;ntesis del calcitriol.<sup>125</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los estudios experimentales mencionados y las observaciones en humanos son muy sugestivos de que las PG incrementan la s&iacute;ntesis del calcitriol, ocasionando hipercalcemias e hipercalciurias. Esto motiva a los autores del presente trabajo a estudiar el efecto <i>in vivo </i>e <i>in vitro </i>de la PGE<sub>1</sub> sobre la s&iacute;ntesis del calcitriol. En ambos modelos experimentales se comprueba que al agregar PGE<sub>1</sub> ex&oacute;gena por v&iacute;a endovenosa o adicionada al cultivo de t&uacute;bulos proximales del ri&ntilde;on de conejos, se incrementa significativamente la s&iacute;ntesis del calcitriol,<sup>3,</sup><sup>4</sup> en forma semejante a lo reportado previamente <i>in vitro </i>con la PGE<sub>2</sub>.<sup>5</sup><sup>,6</sup> Ante el hallazgo de que la PGE<sub>1</sub> estimula la s&iacute;ntesis del calcitriol en forma similar a la PGE<sub>2</sub>, se desarrolla un modelo experimental en conejos en el que al inyectar intravenosamente PGE<sub>1</sub> se produce un aumento significativo de la calcemia, magnesemiay calciuria, manteniendo las hormonas calciotropas en niveles b&aacute;sales, excepto por un incremento significativo del calcitriol. Estos resultados comprueban que la PGE<sub>1</sub> incrementa la s&iacute;ntesis del calcitriol, ocasionando hipercalciuria y reproduciendo el SEPGE en conejos <a href="#c2">(Cuadro 2)</a>. Se trata de un hallazgo adicional al conocimiento de la fisiopatolog&iacute;a del s&iacute;ndrome.<sup>126</sup> Llama la atenci&oacute;n que a pesar del peso experimental y cl&iacute;nico de los resultados que corroboran que las PG incrementan la s&iacute;ntesis del calcitriol, esto ha sido poco mencionado en revisiones recientes.</font></p>     <p align="center"><font face="verdana" size="2"><a name="c2"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/bmim/v63n3/a10c2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">La causa del SEPGE en ni&ntilde;os, no ha sido bien explicada, pero con base a los datos bioqu&iacute;micos obtenidos en animales y en humanos, se puede inferir que las PG de la serie E estimulan la actividad de la 1&alpha;&#150;OHasa renal, hidrolizando la 25(OH)D<sub>3</sub> e incrementando la producci&oacute;n de calcitriol, que produce una hiperabsorci&oacute;n intestinal de Ca y explica la hipercalciuria en estos pacientes <a href="#c1">(Cuadro 1)</a>.</font></p>     <p align="justify"><font face="verdana" size="2">Con estos hallazgos experimentales y por diferentes observaciones cl&iacute;nicas, los autores piensan que el SEPGE existe y que su fisiopatolog&iacute;a est&aacute; caracterizada por un incremento anormal en los niveles de PGE. &Eacute;ste se puede presentar en forma independiente como SEPGE primario (hipercalciurias idiop&aacute;ticas),<sup>125</sup> o sobreimpuesto a otras entidades, SEPGE secundario (s&iacute;ndrome de Bartter, y en neoplasias epiteliales).<sup>1,2,123</sup>Este s&iacute;ndrome debe sospecharse en los pacientes que cursan con hipercalcemias e hipercalciurias no explicables por ninguna de las causas conocidas (hiperparatiroidismo, prote&iacute;na relacionada con la PTH, neoplasias, hiperabsorci&oacute;n intestinal de Ca, hipercalciuria de origen renal, prolongada inmovilizaci&oacute;n, terapia con furosemide, enfermedades granulomatosas, hipertiroidismo, osteog&eacute;nesis imperfecta, artritis reumatoide juvenil, etc.). En estos pacientes con hipercalcemias e hipercalciurias aparentemente idiop&aacute;ticas se debe hacer un estudio metab&oacute;lico &oacute;seo completo, enfatizando el estudio bioqu&iacute;mico del Ca, con hormonas calciotropas y niveles de PG <a href="#c2">(Cuadro 2)</a>. De esa manera se puede identificar el SEPGE y establecer la terapia espec&iacute;fica.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>     <p align="justify"><font face="verdana" size="2">Esta revisi&oacute;n sobre el SEPGE en ni&ntilde;os nos lleva a confirmar su existencia.</font></p>     <p align="justify"><font face="verdana" size="2">El SEPGE se caracteriza por un incremento en los niveles de PG, de calcitriol, de la calcemia y de la calciuria, en pacientes con manifestaci&oacute;n &uacute;nica o superpuesta a otras entidades.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Su patog&eacute;nesis se basa en modelos experimentales o cl&iacute;nicos caracterizados por el exceso de los niveles de PGE, lo que incrementa la s&iacute;ntesis del calcitriol. Este hecho produce un aumento en la absorci&oacute;n intestinal de Ca, ocasionando hipercalcemia e hipercalciuria.</font></p>     <p align="justify"><font face="verdana" size="2">El SEPGE generalmente se corrige con inhibidores de la ciclooxigenasa o de sus sintetasas 1 y 2, con antiinflamatorios de tipo no esteroideos como la indometacina, aspirina, etc.</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">El autor agradece a Sandra Olivas su ayuda en la preparaci&oacute;n del manuscrito.</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. Welch T. The hyperprostaglandin E syndrome: a hypercalciuric variant of Bartter's syndrome. J Bon Miner Res.1997; 12: 1753.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1479922&pid=S1665-1146200600030001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">2. Restrepo R, Welch T, Hug G, Clark K, Bergstrom W. Hypercalciuria with Bartter's syndrome: evidence for an abnormality of vitamin D metabolism. J Pediatr. 1989; 115: 397&#150;404.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1479924&pid=S1665-1146200600030001000002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">3. 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