<?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>1561-2953</journal-id>
<journal-title><![CDATA[Revista Cubana de Endocrinología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Endocrinol]]></abbrev-journal-title>
<issn>1561-2953</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1561-29532012000100009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Algunas consideraciones de la disfunción endotelial en pacientes con hiperprolactinemia]]></article-title>
<article-title xml:lang="en"><![CDATA[Some considerations of endothelial dysfunction in patients presenting with hyperprolactinemia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabrera Gámez]]></surname>
<given-names><![CDATA[Maité]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santana Pérez]]></surname>
<given-names><![CDATA[Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales Pérez]]></surname>
<given-names><![CDATA[Luís Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Endocrinología (INEN)  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Cardiología y Cirugía Cardiovascular  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2012</year>
</pub-date>
<volume>23</volume>
<numero>1</numero>
<fpage>106</fpage>
<lpage>112</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1561-29532012000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1561-29532012000100009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1561-29532012000100009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se realizó una revisión de las publicaciones a nuestro alcance de la actualidad sobre el tema disfunción endotelial en pacientes con hiperprolactinemia: existencia, mecanismos de producción y consecuencias. Teniendo en cuenta que la hiperprolactinemia tiene hoy un nuevo enfoque relacionado con la disfunción endotelial, nos propusimos realizar la revisión siguiente. La disfunción endotelial es una alteración en la relajación vascular inducida por la reducción de los factores de relajación derivados del endotelio, principalmente el óxido nítrico, que causa un aumento del estímulo vasoconstrictor con tendencia protrombótica de la vasculatura. La resistencia a la insulina actúa como principal factor de disfunción endotelial asociado o no con la diabetes mellitus. Hasta el presente, el estado hiperprolactinémico se asocia con trastornos de la tolerancia a la glucosa (tolerancia a la glucosa disminuida con hiperinsulinemia). Existe disfunción endotelial en mujeres hiperprolactinémicas y puede deberse a su relación con resistencia a la insulina, a la disminución de los estrógenos y a la propia hiperprolactinemia. También se han encontrado marcadores de inflamación (como la proteína C reactiva) elevada en pacientes con esta enfermedad. La hiperprolactinemia se asocia con resistencia a la insulina, disfunción endotelial y bajo grado de inflamación, parámetros que son determinantes en el proceso de aterosclerosis, por lo que esta enfermedad puede ser un factor predisponente de aterosclerosis, y por tanto, un riesgo de morbilidad y mortalidad cardiovasculares.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[A review of the publications available of current situation on the subject related to endothelial dysfunction in patients with hyperprolactinemia: existence, production mechanisms and consequences. Taking into account that the hyperprolactinemia has a new approach related to endothelial dysfunction authors made present review. Above mentioned dysfunction is a alteration in the vascular relaxation provoked by decrease of relaxation factors derived from endothelium, mainly the nitric oxide, which cause an increase of vasoconstrictor stimulus with a pro-thrombotic trend of vasculature. The insulin resistance acts as a major factor of endothelial dysfunction associated or not with diabetes mellitus. Until now, the hyperprolactinemia status is associated with disorders of the glucose tolerance (decreased glucose tolerance with hyper-insulinemia). There is endothelial dysfunction in women with hyperprolactinemia and may be due to its relation to insulin resistance, to decrease of estrogens and to the own hyperprolactinemia. Also, there are inflammation's markers (the C-reactive protein) high in patients with this disease. The hyperprolactinemia is associated with the insulin resistance, the endothelial dysfunction and the low degree of inflammation, parameters determinant in the atherosclerosis process, thus, this disease may be a predisposing factor of the atherosclerosis becomes risk of cardiovascular morbidity and mortality.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[hiperprolactinemia]]></kwd>
<kwd lng="es"><![CDATA[disfunción endotelial]]></kwd>
<kwd lng="en"><![CDATA[hyperprolactinemia]]></kwd>
<kwd lng="en"><![CDATA[endothelial dysfunction]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>     <div align="right">REVISI&Oacute;N BIBLIOGR&Aacute;FICA </div> </B></font>      <p>&nbsp;</p>     <p align="left"><b><font face="Verdana, Arial, Helvetica, sans-serif" size="4">Algunas    consideraciones de la disfunci&oacute;n endotelial en pacientes con hiperprolactinemia</font></b></p>     <p align="left">&nbsp;</p>     <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>Some    considerations of endothelial dysfunction in patients presenting with hyperprolactinemia</b></font></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p>     <p align="left"><b><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Dra.    Mait&eacute; Cabrera G&aacute;mez,<SUP>I</SUP> MSc. Dr. Felipe Santana P&eacute;rez,<SUP>I</SUP>    MSc. Dr. Lu&iacute;s Miguel Morales P&eacute;rez<SUP>II</SUP></font></b></p>     <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><SUP>I</SUP>Instituto    Nacional de Endocrinolog&iacute;a (INEN). La Habana, Cuba.    <br>   </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><SUP>II</SUP></font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Instituto    Nacional de Cardiolog&iacute;a y Cirug&iacute;a Cardiovascular. La Habana, Cuba.    </font>      <P>&nbsp;     <P>&nbsp; <hr size="1" noshade>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>RESUMEN</B>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se realiz&oacute;    una revisi&oacute;n de las publicaciones a nuestro alcance de la actualidad    sobre el tema disfunci&oacute;n endotelial en pacientes con hiperprolactinemia:    existencia, mecanismos de producci&oacute;n y consecuencias.<I> </I>Teniendo    en cuenta que la hiperprolactinemia tiene hoy un nuevo enfoque relacionado con    la disfunci&oacute;n endotelial, nos propusimos realizar la revisi&oacute;n    siguiente.<I> </I>La disfunci&oacute;n endotelial es una alteraci&oacute;n en    la relajaci&oacute;n vascular inducida por la reducci&oacute;n de los factores    de relajaci&oacute;n derivados del endotelio, principalmente el &oacute;xido    n&iacute;trico, que causa<FONT  COLOR="#ff0000"> </FONT>un aumento del est&iacute;mulo vasoconstrictor con tendencia    protromb&oacute;tica de la vasculatura.<I> </I>La resistencia a la insulina    act&uacute;a como principal factor de disfunci&oacute;n endotelial asociado    o no con la diabetes mellitus. Hasta el presente, el estado hiperprolactin&eacute;mico    se asocia con trastornos de la tolerancia a la glucosa (tolerancia a la glucosa    disminuida con hiperinsulinemia). Existe disfunci&oacute;n endotelial en mujeres    hiperprolactin&eacute;micas y puede deberse a su relaci&oacute;n con resistencia    a la insulina, a la disminuci&oacute;n de los estr&oacute;genos y a la propia    hiperprolactinemia. Tambi&eacute;n se han encontrado marcadores de inflamaci&oacute;n    (como la prote&iacute;na C reactiva) elevada en pacientes con esta enfermedad.<I>    </I>La hiperprolactinemia se asocia con resistencia a la insulina, disfunci&oacute;n    endotelial y bajo grado de inflamaci&oacute;n, par&aacute;metros que son determinantes    en el proceso de aterosclerosis, por lo que esta enfermedad puede ser un factor    predisponente de aterosclerosis, y por tanto, un riesgo de morbilidad y mortalidad    cardiovasculares. </font>      <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Palabras clave:    </B>hiperprolactinemia, disfunci&oacute;n endotelial. </font> <hr size="1" noshade>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>ABSTRACT</b>    ]]></body>
<body><![CDATA[<br>       <br>   A review of the publications available of current situation on the subject related    to endothelial dysfunction in patients with hyperprolactinemia: existence, production    mechanisms and consequences. Taking into account that the hyperprolactinemia    has a new approach related to endothelial dysfunction authors made present review.    Above mentioned dysfunction is a alteration in the vascular relaxation provoked    by decrease of relaxation factors derived from endothelium, mainly the nitric    oxide, which cause an increase of vasoconstrictor stimulus with a pro-thrombotic    trend of vasculature. The insulin resistance acts as a major factor of endothelial    dysfunction associated or not with diabetes mellitus. Until now, the hyperprolactinemia    status is associated with disorders of the glucose tolerance (decreased glucose    tolerance with hyper-insulinemia). There is endothelial dysfunction in women    with hyperprolactinemia and may be due to its relation to insulin resistance,    to decrease of estrogens and to the own hyperprolactinemia. Also, there are    inflammation's markers (the C-reactive protein) high in patients with this disease.    The hyperprolactinemia is associated with the insulin resistance, the endothelial    dysfunction and the low degree of inflammation, parameters determinant in the    atherosclerosis process, thus, this disease may be a predisposing factor of    the atherosclerosis becomes risk of cardiovascular morbidity and mortality.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Key words:</b>    hyperprolactinemia, endothelial dysfunction.</font> <hr size="1" noshade>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><B>INTRODUCCI&Oacute;N</B>    </font></p>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El endotelio vascular    es un &oacute;rgano distribuido por todo el organismo y act&uacute;a como una    extensa gl&aacute;ndula autocrina, paracrina y endocrina. Es un tejido din&aacute;mico,    y sus propiedades y funciones se deben a su habilidad para detectar los est&iacute;mulos    humorales y hemodin&aacute;micos, y con base en estos, produce una serie de    respuestas mediadas por sustancias que modulan la respuesta al estimulo.<SUP>1,2</SUP>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La disfunci&oacute;n    endotelial (DE) es una alteraci&oacute;n en la relajaci&oacute;n vascular inducida    por la reducci&oacute;n de los factores de relajaci&oacute;n derivados del endotelio,    principalmente el &oacute;xido n&iacute;trico, que causa un aumento del est&iacute;mulo    vasoconstrictor con tendencia protromb&oacute;tica de la vasculatura.<SUP>3,4</SUP>    Este desequilibrio en las funciones del endotelio lleva a la p&eacute;rdida    de su papel protector en la homeostasis vascular, y es considerada actualmente    una diana para la intervenci&oacute;n terap&eacute;utica que bien podr&iacute;a    ser reversible.<SUP>2</SUP> </font>      ]]></body>
<body><![CDATA[<P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La DE puede medirse    de diferentes formas: a trav&eacute;s de la vasodilataci&oacute;n dependiente    del endotelio (induciendo hiperemia distal por ligadura del antebrazo, administraci&oacute;n    de f&aacute;rmacos intrarteriales en la arteria braquial), por la medici&oacute;n    de marcadores de activaci&oacute;n endotelial (prote&iacute;na C reactiva, prote&iacute;na    amiloide A, endotelina 1, &oacute;xido n&iacute;trico, factor de Von-Willebrand,    trombomodulina E y P, mol&eacute;culas de adhesi&oacute;n: c&eacute;lulas vasculares    [VCAM], intracelulares [ICAM], interleucina-6 [IL6], factor de necrosis tumoral    alfa [FNT-alfa], factor tisular activador del plasmin&oacute;geno A, inhibidor    del activador del plasmin&oacute;geno [PAI-1], mol&eacute;culas solubles de    adhesi&oacute;n intracelular-1, entre otras), as&iacute; como la evaluaci&oacute;n    de la permeabilidad vascular a trav&eacute;s de la microalbuminuria.<SUP>5</SUP>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Hoy en d&iacute;a    tiene una gran aplicaci&oacute;n cl&iacute;nica el diagn&oacute;stico temprano    de la DE porque permite la identificaci&oacute;n precoz de factores de riesgo    de enfermedad cardiovascular, &uacute;til para la investigaci&oacute;n de los    mecanismos incipientes de aterosclerosis, y para intervenir en aquellas pacientes    con marcadores de riesgo en estadios tempranos.<SUP>6</SUP> </font>     <P>&nbsp;     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B><font size="3">DESARROLLO</font></B>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El endotelio no    se comporta de manera uniforme en todo el organismo, sino que tiene especializaci&oacute;n    regional, consecuencia de influencias metab&oacute;licas regionales y de producci&oacute;n    local de diferentes autacoides y neurohormonas.<SUP>7</SUP> La resistencia a    la insulina act&uacute;a como principal factor de DE asociado o no con la diabetes    mellitus. Gran parte del problema cardiovascular que genera la resistencia a    la insulina es porque esta alteraci&oacute;n no es homog&eacute;nea, ya que    la captaci&oacute;n de glucosa es diferente en cada tejido y la sensibilidad    a la insulina tambi&eacute;n; existen tejidos insulinorresistentes, que por    su volumen, afectan la concentraci&oacute;n s&eacute;rica de insulina, y otros    que son insulinosensibles, y por su capacidad de producir hormonas y agentes    neurohormonales, impactan la funci&oacute;n cardiovascular.<SUP>7,8</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los efectos de    la insulina para estimular el ingreso de glucosa al m&uacute;sculo y tejido    adiposo pueden compartir mecanismos efectores posreceptor, con el efecto regulador    del oxido n&iacute;trico; por lo que, cualquier alteraci&oacute;n en la v&iacute;a    de se&ntilde;alizaci&oacute;n de la insulina a este nivel, puede producir resistencia    a la insulina y DE. Estas v&iacute;as posreceptor incluyen b&aacute;sicamente    la prote&iacute;na cinasa mit&oacute;gena activada y la cinasa fosfatidil inositol-3    (Pi3-K).<SUP>9</SUP> Otro mecanismo recientemente descrito de la hiperinsulinemia    para inducir DE, es el aumento de la disponibilidad de endotelina-1, y, secundariamente,    se incrementa la producci&oacute;n de ani&oacute;n s&uacute;per &oacute;xido    por medio de la activaci&oacute;n del sistema &oacute;xido-reducci&oacute;n.<SUP>10,11</SUP>    </font>     ]]></body>
<body><![CDATA[<P>      <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><B>Hiperprolactinemia</B>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Aunque la hiperprolactinemia    es una alteraci&oacute;n com&uacute;n en la esfera reproductiva, sus consecuencias    metab&oacute;licas exactas a&uacute;n no se conocen. Hasta el presente, el estado    hiperprolactin&eacute;mico est&aacute; asociado con trastornos de la tolerancia    a la glucosa. <I>Landgraf </I>y otros<SUP>12</SUP> demostraron la presencia    de tolerancia a la glucosa disminuida con hiperinsulinemia en pacientes con    hiperprolactinemia, lo cual sugiere que la prolactina era una hormona diabetog&eacute;nica.<SUP>13</SUP>    Estudios en nuestra instituci&oacute;n encontraron incremento de los niveles    plasm&aacute;ticos de glucemia basal y 2 h posteriores a la prueba de tolerancia    oral a la glucosa (PTG-O)<FONT  COLOR="#ff0000"> </FONT>en mujeres con niveles de prolactina superiores a 2 500    mUI/L, quienes, adem&aacute;s, presentaron los niveles de insulina m&aacute;s    elevados en todos los momentos de la PTG-O.<SUP>14</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los resultados    de <I>Dilek</I> y otros<SUP>15</SUP> demostraron una relaci&oacute;n causal    entre hiperprolactinemia, alteraciones de la tolerancia a la glucosa, y disminuci&oacute;n    de la sensibilidad a la insulina. Una relaci&oacute;n significativa entre hiperprolactinemia    y el &iacute;ndice de sensibilidad a la insulina indican un efecto directo de    la prolactina y la sensibilidad a la insulina. Otros autores<SUP>16,17</SUP>    han demostrado que la prolactina altera las caracter&iacute;sticas secretorias    de la insulina y aumenta la hiperinsulinemia, para conducir a la resistencia    a la insulina.<SUP>12,18,19</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Investigaciones    m&aacute;s recientes<SUP>15</SUP><FONT  COLOR="#ff0000"> </FONT>muestran que la funci&oacute;n endotelial medida por vasodilataci&oacute;n    es baja en pacientes con hiperprolactinemia, sin otra alteraci&oacute;n que    pudiera producir DE, en comparaci&oacute;n con mujeres sanas, e incluso, aquellas    tratadas con bromocriptina con cifras de prolactina en niveles normales. La    DE en mujeres hiperprolactin&eacute;micas puede deberse a su asociaci&oacute;n    con resistencia a la insulina, a la disminuci&oacute;n de los estr&oacute;genos    y a la propia hiperprolactinemia <I>per se</I>. Existen trabajos que demuestran    que los elevados niveles de prolactina s&eacute;rica y los bajos niveles de    estr&oacute;genos que caracterizan a esta enfermedad, son factores de riesgo    independientes para DE en mujeres con hiperprolactinemia.<SUP>19</SUP> Existen    tambi&eacute;n contradicciones al no encontrar asociaci&oacute;n entre vasodilataci&oacute;n    medida por el flujo de la arteria braquial, y niveles de estr&oacute;genos;    mientras que otros se&ntilde;alan que la DE mejora con el uso de estr&oacute;genos    en mujeres posmenop&aacute;usicas que tienen tratamiento con terapia de reemplazo    hormonal.<SUP>20</SUP> </font>     <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Estudios anteriores    ya hab&iacute;an demostrado relaci&oacute;n entre marcadores indirectos de activaci&oacute;n    de c&eacute;lulas endoteliales y marcadores de inflamaci&oacute;n, como la prote&iacute;na    C reactiva (PCR). Esta &uacute;ltima se ha encontrado elevada en pacientes con    hiperprolactinemia, en las que existe una correlaci&oacute;n inversa con niveles    de PCR, lo que sugiere que la hiperprolactinemia se acompa&ntilde;a de un bajo    grado de inflamaci&oacute;n y DE.<SUP>21,22</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">An&aacute;lisis    de inmunohistoqu&iacute;mica en arterias coronarias de pacientes con hiperprolactinemia    fallecidos por enfermedad coronaria aguda, revelaron la presencia de de receptores    de prolactina (PRL) en las paredes de las arterias con aterosclerosis avanzada.    La presencia de niveles elevados de receptores de PRL dentro de la placa de    ateroma, sugiere que la PRL puede modular el proceso de aterosclerosis. Se sugieren    2 hip&oacute;tesis para explicar esta modulaci&oacute;n: el aumento de la expresi&oacute;n    de receptores de prolactina durante el proceso de la aterosclerosis se debe    a que la capacidad de respuesta de la arteria coronaria a la prolactina, aumenta,    sin que sea necesario para esto, cambios en los niveles circulantes de prolactina.    En esta explicaci&oacute;n se postula que el ambiente inflamatorio en las placas    ateroscler&oacute;ticas avanzadas podr&iacute;a estimular la expresi&oacute;n    de los receptores de la prolactina; por otra parte, existe la hip&oacute;tesis    de que la prolactina podr&iacute;a modular el proceso ateroscler&oacute;tico    a trav&eacute;s de su acci&oacute;n auto/paracrino, similar a lo que ha sido    propuesto recientemente, para explicar los efectos de la prolactina en el crecimiento    del c&aacute;ncer de pr&oacute;stata.<SUP>23</SUP> El papel de la se&ntilde;alizaci&oacute;n    del receptor de PRL activado en promover la aterosclerosis, estar&iacute;a en    l&iacute;nea con estudios <I>in vitro,</I> que muestran que la PRL es capaz    de modular la respuesta inflamatoria y estimular la adhesi&oacute;n de c&eacute;lulas    mononucleares al endotelio, y aumentar la proliferaci&oacute;n vascular de c&eacute;lulas    musculares lisas.<SUP>24,25</SUP> </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><I>Wallaschofski</I>    y otros encontraron en estudios experimentales que la hiperprolactinemia es    un potente coestimulador plaquetario, y plantean una asociaci&oacute;n de la    hiperprolactinemia con fen&oacute;menos de tromboembolismo venoso,<SUP>26-28</SUP>    y <I>Likewise</I> encontr&oacute; 6 pacientes con tromboembolismo venoso en    una serie de 136 pacientes con prolactinoma.<SUP>29</SUP> La hiperprolactinemia    est&aacute; implicada en la reactividad plaquetaria, y aparece elevada en pacientes    con isquemias cerebrales y s&iacute;ndromes coronarios agudos.<SUP>30,31</SUP>    En general, en estos pacientes, las plaquetas muestran un incremento en su adhesividad    e hiperagregabilidad, debido al aumento de glicoprote&iacute;nas y prote&iacute;nas    adhesivas en la superficie de estas, que incrementan la uni&oacute;n del fibrin&oacute;geno,    y disminuye la fluidez de la membrana, esto produce alteraciones en el metabolismo    plaquetario y modifica las v&iacute;as de se&ntilde;alizaci&oacute;n intraplaquetarias.<SUP>32,33</SUP>    </font>     <P>      <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Con el objetivo    de demostrar la hip&oacute;tesis que la PRL elevada contribuye a aumentar el    riesgo cardiovascular en mujeres en posmenopausia temprana, se realiz&oacute;    un estudio<SUP>34</SUP> enfocado a fundamentar la posible asociaci&oacute;n    de la hiperprolactinemia con la tensi&oacute;n arterial central y perif&eacute;rica,    y se encontr&oacute; correlaci&oacute;n positiva entre hiperprolactinemia e    hipertensi&oacute;n arterial sist&oacute;lica y diast&oacute;lica central (a&oacute;rtica),    y la velocidad de la onda de pulso como marcador de endurecimiento arterial.    Los niveles de PRL mayor de 8 ng/mL tienen un 100 % de sensibilidad para predecir    altos niveles de presi&oacute;n arterial perif&eacute;rica. En este mismo estudio    se correlacion&oacute;, de forma positiva, con el &iacute;ndice de la Sociedad    Europea de Cardiolog&iacute;a, que predice la mortalidad en 10 a&ntilde;os.    </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Es conocido desde    1977 que los niveles de prolactina est&aacute;n aumentados en hombres con hipertensi&oacute;n    arterial esencial, y que la disminuci&oacute;n de estos niveles contribuye al    control de la tensi&oacute;n arterial.<SUP>35</SUP> En una investigaci&oacute;n<SUP>36</SUP>    en la que se determinaron los niveles de PRL en diferentes horarios del d&iacute;a    (12 PM, 9 PM y 7 AM) en hombres normoprolactin&eacute;micos con diagn&oacute;stico    reciente de hipertensi&oacute;n arterial, que a&uacute;n no eran tratados y    en los que la DE fue medida por dilataci&oacute;n mediada por el flujo, se concluy&oacute;    que las fluctuaciones diurnas de los niveles de prolactina est&aacute;n asociadas    con una disminuci&oacute;n de la funci&oacute;n endotelial, y que ocurren en    las primeras horas de la ma&ntilde;ana. </font>     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En conclusi&oacute;n,    la hiperprolactinemia se asocia a la resistencia a la insulina, DE y bajo grado    de inflamaci&oacute;n, par&aacute;metros que son determinantes en el proceso    de aterosclerosis, por lo que la hiperprolactinemia puede ser un factor predisponente    de aterosclerosis, y por tanto, un riesgo de morbilidad y mortalidad cardiovasculares.    </font>      <P>&nbsp;     ]]></body>
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<body><![CDATA[<!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">34. Georgiopoulos    GA, Stamatelopoulos KS, Lambrinoudaki I, Lykka M, Kyrkou K, Rizos D, et al.    Prolactin and Preclinical Atherosclerosis in Menopausal Women With Cardiovascular    Risk Factors. Am J Hypertens. 2011;24(5):569-73.     </font>      <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">35. Stumpe KO,    Kolloch R, Higuchi M, Kruk F, Vetter H. Hyperprolactinemia and antihypertensive    effect of bromocriptine in essential hypertension: identification of abnormal    central dopamine control. Lancet. 1977;2:211-4.     </font>     <!-- ref --><P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">36. Stamatelopoulos    KS, Georgiopoulos GA, Sfikakis PP, Kollias G, Manios E, Mantzou E, et al. Pilot    study of circulating prolactin levels and endothelial function in men with hypertension.    Curr Pharm Des. 2004;10(29):3591-605.    </font>      <P>&nbsp;     <P>&nbsp;     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Recibido: 10 de    agosto de 2011.     <br>   </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Aprobado:    5 de noviembre de 2011.</font>      ]]></body>
<body><![CDATA[<P>&nbsp;     <P>&nbsp;     <P><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><I>Mait&eacute;    Cabrera G&aacute;mez. </I>Instituto Nacional de Endocrinolog&iacute;a (INEN).    Calle Zapata, esquina C, Vedado, municipio Plaza. La Habana, Cuba. Correos electr&oacute;nicos:    <U><FONT  COLOR="#0000ff"><a href="mailto:maite@inend.sld.cu">maite@inend.sld.cu</a></FONT></U>    </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><U><FONT COLOR="#0000ff"><a href="mailto:maite.gamez@infomed.sld.cu">maite.gamez@infomed.sld.cu</a></FONT></U>    </font>       ]]></body><back>
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