<?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>0120-0011</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[rev.fac.med.]]></abbrev-journal-title>
<issn>0120-0011</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-00112012000400010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análogos de insulina: relevancia clínica y perspectivas futuras]]></article-title>
<article-title xml:lang="en"><![CDATA[Insulin analogues: clinical relevance and future perspectives]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bejarano-Roncancio]]></surname>
<given-names><![CDATA[Jhon Jairo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almarza-Labarca]]></surname>
<given-names><![CDATA[Johan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Veloza-Naranjos]]></surname>
<given-names><![CDATA[Angélica Lucía]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Nutrición Humana Facultad de Medicina]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Universitario San Ignacio Unidad de Endocrinología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>60</volume>
<numero>4</numero>
<fpage>333</fpage>
<lpage>341</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-00112012000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-00112012000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-00112012000400010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Desde la década de los noventa han sido diseñados análogos de insulina para el manejo de pacientes diabéticos usando técnicas de ADN recombinante. Las modificaciones de la molécula original de insulina humana les confieren una rápida, ultrarrápida y prolongada acción. Entre las insulinas ultra rápidas están la Aspártica, la Lispro y la Glulisina y entre las de acción prolongada están la Glargina y la Detemir. También se encuentran mezcladas con insulina humana NPH en diferentes proporciones. Aunque existen diferentes tipos de algoritmos terapéuticos, la insulinización sigue siendo una terapia artesanal basada en la experiencia del especialista tratante. La introducción de los análogos de insulina hace más factible el empleo de bolos correctores o dosis extra de insulina para reducir las hipoglicemias puntuales en cualquier momento del día y facilitar el manejo de los carbohidratos en la dieta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Insulin analogues have been engineered through recombinant DNA techniques for managing diabetic patients since the 1990s; modifications to the original human insulin molecule have made them rapid, ultrarapid and prolonged acting. Aspart, lispro and glulisine are ultrafast insulins and glargine and detemir are longacting ones. Such insulins may be premixed in formulations combining neutral protamine Hagedorn (NPH) with regular human insulin (70%/30%). Different types of therapeutic algorithms are available nowadays but insulinisation remains a crafted therapy based on the treating specialist's experience. The introduction of insulin analogues enables using correction boluses or extra doses of insulin to reduce hypoglycaemia at any time of the day and facilitates handling carbohydrates in a particular patient's diet.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[insulina]]></kwd>
<kwd lng="es"><![CDATA[farmacocinética]]></kwd>
<kwd lng="es"><![CDATA[diabetes mellitus]]></kwd>
<kwd lng="es"><![CDATA[hipoglucemiantes]]></kwd>
<kwd lng="es"><![CDATA[células secretoras de insulina]]></kwd>
<kwd lng="en"><![CDATA[insulin,pharmacokinetics]]></kwd>
<kwd lng="en"><![CDATA[diabetes mellitus]]></kwd>
<kwd lng="en"><![CDATA[hypoglycemic]]></kwd>
<kwd lng="en"><![CDATA[insulinsecreting cells]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana">     <p>ACTUALIZACI&Oacute;N</p>      <p align="center"><font size="4"><b>An&aacute;logos de insulina: relevancia cl&iacute;nica y perspectivas futuras</b></font></p>      <p align="center"><font size="3"><b><i>Insulin analogues: clinical relevance and future perspectives</i></b></font></p>      <p align="center">Jhon Jairo Bejarano-Roncancio<sup>1</sup>, Johan Carlos Almarza-Labarca<sup>2</sup>, Ang&eacute;lica Luc&iacute;a Veloza-Naranjos<sup>3</sup></p>      <p><sup>1</sup> Nutricionista Dietista. Especialista en Gerencia de Servicios de Salud. Especialista en Multimedia para la docencia. Mag&iacute;ster en Educaci&oacute;n. Doctorando en Nutrici&oacute;n. Profesor Asociado. Departamento de Nutrici&oacute;n Humana. Facultad de Medicina. Universidad Nacional de Colombia. Sede Bogot&aacute;.    <br> <sup>2</sup> Nutricionista Dietista. Magister en Metabolismo Humano. Universidad del Zulia. Maracaibo, Venezuela.    <br> <sup>3</sup> Nutricionista Dietista. Mag&iacute;ster en Ciencias Biol&oacute;gicas. Nutricionista Unidad de Endocrinolog&iacute;a Hospital Universitario San Ignacio. Bogot&aacute;.</p>      <p>Correspondencia: <a href="mailto:jjbejaranor@unal.edu.co">jjbejaranor@unal.edu.co</a></p>      <p><b>Recibido</b>: 1/09/2012 / <b>Enviado a pares</b>: 17/09/2012 / <b>Aprobado</b>: 12/12/2012</p>  <hr>      ]]></body>
<body><![CDATA[<p><b>Resumen</b></p>      <p>Desde la d&eacute;cada de los noventa han sido dise&ntilde;ados an&aacute;logos de insulina para el manejo de pacientes diab&eacute;ticos usando t&eacute;cnicas de ADN recombinante. Las modificaciones de la mol&eacute;cula original de insulina humana les confieren una r&aacute;pida, ultrarr&aacute;pida y prolongada acci&oacute;n. Entre las insulinas ultra r&aacute;pidas est&aacute;n la Asp&aacute;rtica, la Lispro y la Glulisina y entre las de acci&oacute;n prolongada est&aacute;n la Glargina y la Detemir. Tambi&eacute;n se encuentran mezcladas con insulina humana NPH en diferentes proporciones. Aunque existen diferentes tipos de algoritmos terap&eacute;uticos, la insulinizaci&oacute;n sigue siendo una terapia artesanal basada en la experiencia del especialista tratante. La introducci&oacute;n de los an&aacute;logos de insulina hace m&aacute;s factible el empleo de bolos correctores o dosis extra de insulina para reducir las hipoglicemias puntuales en cualquier momento del d&iacute;a y facilitar el manejo de los carbohidratos en la dieta.</p>      <p><b>Palabras clave</b>. insulina, farmacocin&eacute;tica, diabetes mellitus, hipoglucemiantes, c&eacute;lulas secretoras de insulina, (DeCS).</p>  <hr>      <p><b>Summary</b></p>      <p>Insulin analogues have been engineered through recombinant DNA techniques for managing diabetic patients since the 1990s; modifications to the original human insulin molecule have made them rapid, ultra-rapid and prolonged acting. Aspart, lispro and glulisine are ultrafast insulins and glargine and detemir are longacting ones. Such insulins may be premixed in formulations combining neutral protamine Hagedorn (NPH) with regular human insulin (70%/30%). Different types of therapeutic algorithms are available nowadays but insulinisation remains a crafted therapy based on the treating specialist's experience. The introduction of insulin analogues enables using correction boluses or extra doses of insulin to reduce hypoglycaemia at any time of the day and facilitates handling carbohydrates in a particular patient's diet.</p>      <p><b>Key words</b>. insulin,pharmacokinetics, diabetes mellitus, hypoglycemic, insulin-secreting cells, (MeSH).</p>  <hr>      <p><font size="3"><b>Introducci&oacute;n</b></font></p>      <p>En el mundo hay m&aacute;s de 346 millones de personas con diabetes. Se calcula que en el a&ntilde;o 2004 fallecieron 3,4 millones pacientes como consecuencia de esta enfermedad. M&aacute;s del 80% de las muertes por diabetes se registran en pa&iacute;ses de ingresos bajos y medios. Casi la mitad de esas muertes corresponden a personas de menos de 70 a&ntilde;os y un 55% son mujeres. La OMS prev&eacute; que las muertes por diabetes se multipliquen por dos entre 2005 y 2030 (1).</p>      <p>Una parte fundamental del tratamiento de la diabetes es la insulinoterapia. La presente revisi&oacute;n documental describe el fundamento de la farmacocin&eacute;tica, la farmacodinamia de los an&aacute;logos de la insulina y su relevancia en el manejo de la diabetes en pacientes insulinodependientes, entre ellos se mencionan los an&aacute;logos de acci&oacute;n ultrarr&aacute;pida que tienen una eficacia fisiol&oacute;gica de acuerdo al manejo diet&eacute;tico estricto de los carbohidratos consumidos durante el d&iacute;a y las insulinas de acci&oacute;n prolongada que pueden facilitar la terap&eacute;utica del paciente, posterior a las comidas y entre ellas, as&iacute; como en momentos de ayuno nocturno, permitiendo una regulaci&oacute;n glic&eacute;mica y una mejor respuesta metab&oacute;lica. As&iacute; mismo, se presentan algunos avances en la formulaci&oacute;n y desarrollo de diferentes tipos de insulina que a partir de modificaciones moleculares y bioqu&iacute;micas, podr&iacute;an ofrecer una alternativa m&aacute;s sencilla para el manejo insul&iacute;nico y dietario del paciente diab&eacute;tico.</p>      <p><font size="3"><b>An&aacute;logos de insulinas utilizados en la pr&aacute;ctica cl&iacute;nica.</b></font></p>      ]]></body>
<body><![CDATA[<p>El fundamento del dise&ntilde;o de an&aacute;logos de la insulina se basa en "imitar" fisiol&oacute;gicamente la secreci&oacute;n oscilatoria de insulina de las c&eacute;lulas beta del p&aacute;ncreas. En estados basales la insulina se secreta de forma puls&aacute;til en oscilaciones r&aacute;pidas de 8 a 15 minutos (2-6). En per&iacute;odos absortivos la secreci&oacute;n de insulina es bif&aacute;sica. Una fase aguda, que es representada por los gr&aacute;nulos presentes en el citoplasma de las c&eacute;lulas beta con una duraci&oacute;n de 5 a 10 minutos y una fase prolongada la cual es dependiente b&aacute;sicamente de factores hormonales y su duraci&oacute;n es de dos horas aproximadamente (<a href="#fig1">Fgura 1</a>). Para solucionar medianamente esta problem&aacute;tica, han surgido nuevos an&aacute;logos por t&eacute;cnicas de ADN recombinante con mayor eficiencia cl&iacute;nica, mediante sustituci&oacute;n, adici&oacute;n, inversi&oacute;n de amino&aacute;cidos o adici&oacute;n de &aacute;cidos grasos en su estructura qu&iacute;mica (<a href="#fig2">Figura 2</a>).</p>      <p align="center"><a name="fig1"></a><img src="img/revistas/rfmun/v60n4/v60n4a10f1.jpg"></p>      <p align="center"><a name="fig2"></a><img src="img/revistas/rfmun/v60n4/v60n4a10f2.jpg"></p>      <p><b>1. Insulinas de acci&oacute;n ultra r&aacute;pida</b></p>      <p>Las insulinas de acci&oacute;n ultra r&aacute;pida son construidas por la modificaci&oacute;n de la estructura de la insulina humana, favoreciendo una r&aacute;pida disociaci&oacute;n y formaci&oacute;n de mon&oacute;meros de insulinas estables, debido a esto su absorci&oacute;n es r&aacute;pida (Ver <a href="#fig3">figura 3</a>) (4). Tres tipos de insulinas est&aacute;n actualmente en el mercado: Lispro, Asp&aacute;rtica y Glulisina. La insulina Lispro fue la primera insulina de acci&oacute;n ultra r&aacute;pida introducida en el mercado en 1996. Es producida por la inversi&oacute;n de las posiciones 28-29 (prolina y lisina respectivamente) de la cadena B de la insulina. En el mercado se encuentra en forma de Humalog.</p>      <p align="center"><a name="fig3"></a><img src="img/revistas/rfmun/v60n4/v60n4a10f3.jpg"></p>      <p>La insulina asp&aacute;rtica es producida por el reemplazo de la prolina de la posici&oacute;n 28 por &aacute;cido asp&aacute;rtico en la cadena B (<a href="#fig2">figura 2</a>). La insulina asp&aacute;rtica se encuentra en el mercado en forma de Novorapid e incluida en soluciones premezcladas con protamina (Novomix 30). La Glulisina es sintetizada por el reemplazo de la asparagina en la posici&oacute;n 3, por lisina; y la lisina de la posici&oacute;n 29 por &aacute;cido glut&aacute;mico de la cadena B. En el mercado se encuentra en forma de Apidra (4,7,8-13).</p>      <p>La acci&oacute;n r&aacute;pida de estos an&aacute;logos insul&iacute;nicos trata de simular la fase aguda de secreci&oacute;n pancre&aacute;tica. Tienen un pico m&aacute;ximo de acci&oacute;n de 30 a 90 minutos con un inicio de acci&oacute;n a los 15 minutos y una vida media de 4 a 6 horas (<a href="#fig3">figura 3</a>, <a href="#tab1">tabla 1</a>). En ni&ntilde;os menores y pacientes geri&aacute;tricos, cuyas necesidades nutricionales y comportamiento metab&oacute;lico es relativo, con una ingesta diet&eacute;tica variable es conveniente el uso de este tipo de insulinas antes de cada comida o inmediatamente despu&eacute;s (11-12).</p>      <p align="center"><a name="tab1"></a><img src="img/revistas/rfmun/v60n4/v60n4a10t1.jpg"></p>      <p><b>2. Insulinas lentas o de acci&oacute;n prolongada</b>      ]]></body>
<body><![CDATA[<p>La insulina Glargina y Detemir est&aacute;n disponibles en la actualidad. La Glargina es producida por tres modificaciones aminoac&iacute;dicas en la cadena B de la mol&eacute;cula de insulina. La modificaci&oacute;n de la estructura primaria de la cadena B conduce a la formaci&oacute;n de tetr&aacute;meros por interacciones electrost&aacute;ticas con el &aacute;tomo de zinc haci&eacute;ndolas m&aacute;s estables en forma polim&eacute;rica, por tal motivo, la liberaci&oacute;n de los mon&oacute;meros es m&aacute;s prolongada (4-7, 10-11). La Glargina y el Detemir tienen una vida media de 24 horas y 20 horas, respectivamente, despu&eacute;s de la administraci&oacute;n de 0,4 IU/kg. Por tal motivo este tipo de insulinas se administran una o dos veces al d&iacute;a para compensar los ritmos puls&aacute;tiles en estados interprandiales y ayuno nocturno (<a href="#fig3">Figura 3</a> y <a href="#fig4">4</a>) (12).</p>      <p align="center"><a name="fig4"></a><img src="img/revistas/rfmun/v60n4/v60n4a10f4.jpg"></p>      <p><b>3. Insulinas premezcladas</b></p>      <p>Las insulinas premezcladas son la combinaci&oacute;n de una insulina basal o de acci&oacute;n intermedia con un an&aacute;logo ultra-r&aacute;pido. Sirven para imitar esquemas convencionales o intensivos de insulina con dos a tres inyecciones diarias seg&uacute;n criterio m&eacute;dico. Entre las soluciones premezcladas que se encuentran en el mercado est&aacute;n HumalogMix 25 y Mix 50, las cuales contienen en soluci&oacute;n Lispro m&aacute;s Lisproprotaminizada. Esta &uacute;ltima tiene un perfil de acci&oacute;n similar al de la NPH.Tambi&eacute;n se encuentra Novo mix 30/70, 50/50 0 70/30. La cual es una mezcla de insulina Aspartato soluble con aspartato cristalizada protaminizada.</p>      <p align="center"><a name="fig5"></a><img src="img/revistas/rfmun/v60n4/v60n4a10f5.jpg"></p>      <p>Se ha evidenciado mejor&iacute;a en el control gluc&eacute;mico al comparar las mezclas de insulina con las insulinas basales. Esto se asocia con una durabilidad adecuada de las insulinas en mezcla (55).</p>      <p><b>4. Eficacia cl&iacute;nica de los an&aacute;logos de insulina</b></p>      <p>En diab&eacute;ticos mellitus tipo 1 el rol de la insulina Lispro en el mejoramiento de la glicemia postprandial ha sido evaluado en diversos estudios, en comparaci&oacute;n a la insulina regular humana. Estos resultados demuestran que las glicemias postprandiales fueron menores con la administraci&oacute;n de Lispro, en per&iacute;odos superiores de un a&ntilde;o (14-15).</p>      <p>En diab&eacute;ticos tipo 2, se ha estudiado el efecto de la inyecci&oacute;n de an&aacute;logos combinados Lispro/Glargina en comparaci&oacute;n a la mezcla insulina regular/NPH, demostrando que la combinaci&oacute;n de los an&aacute;logos disminuye los niveles de glucosa postprandial con dosis significativamente bajas y disminuye de forma importante los episodios de hipoglicemias. Estudios realizados con insulinas Aspart y Glulisina mostraron resultados similares en la glucosa postprandial con disminuci&oacute;n de los episodios hipoglic&eacute;micos nocturnos (16-24).</p>      <p>En el caso de las insulinas de acci&oacute;n prolongada, en diab&eacute;ticos tipo 1 se ha demostrado la eficacia cl&iacute;nica de la Glargina en comparaci&oacute;n con la NPH, present&aacute;ndose menos episodios de hipoglicemias. Cuando la Glargina se administra en bolo, se demuestra un control glic&eacute;mico efectivo. Por otro lado, la administraci&oacute;n de dos dosis diarias de Detemir, demostr&oacute; un buen control glic&eacute;mico, reduce el riesgo de hipoglicemia nocturna y poca ganancia de peso en comparaci&oacute;n con reg&iacute;menes de NPH (25-26). Detemir demuestra poca variabilidad en la glucosa plasm&aacute;tica en comparaci&oacute;n con el NPH o Glargina, lo que sugiere que el Detemir puede usarse como terapia en diab&eacute;ticos tipo 1 (27).</p>      ]]></body>
<body><![CDATA[<p>En un estudio aleatorizado reciente de 26 semanas en diab&eacute;ticos tipo 1, que recib&iacute;an Gliargina o Detemir, una y dos veces al d&iacute;a respectivamente, en combinaci&oacute;n con insulina Aspart, se encontr&oacute; un buen control glic&eacute;mico en ambos grupos sin diferencias en los eventos hipoglic&eacute;micos (28). En diab&eacute;ticos tipo 2 la Glargina administrada una vez al d&iacute;a demuestra control glic&eacute;mico con cambios leves en el peso. En comparaci&oacute;n con la Rosiglitazona, tiene una mayor eficacia cl&iacute;nica, encontr&aacute;ndose disminuci&oacute;n de la hemoglobina glucosilada, pasando de &gt; 9,5% a concentraciones plasm&aacute;ticas menores de 7% (29-33).</p>      <p>Se ha demostrado mejor&iacute;a de la glucosa basal con la administraci&oacute;n de Detemir en comparaci&oacute;n al grupo de NPH (34). En el LevemirTreattoStudy se ensay&oacute; la adici&oacute;n de insulinas de acci&oacute;n prolongada a la terapia de hipoglicemiantes orales, observ&aacute;ndose mejor&iacute;a de los niveles de HbA1c. En diab&eacute;ticos tipo 1 se ha demostrado una eficiencia tanto de la Glargina y el Detemir en los niveles de HbA1c, y resultados similares fueron encontrados en diab&eacute;ticos tipo 2 que recib&iacute;an terapia con hipoglicemiantes orales a las que se les adiciona Glargina (35-36). En la tabla 1 se resume el perfil farmacocin&eacute;tico de los an&aacute;logos de insulina usados en la pr&aacute;ctica cl&iacute;nica.</p>      <p><b>5. Insulinas en fase de investigaci&oacute;n</b></p>      <p>Debido a la prevalencia mundial de la diabetes y en especial por el manejo terap&eacute;utico de la tipo 1 y la fase de insulinodependencia de la tipo 2, la industria farmac&eacute;utica ha realizado estudios y avances en el desarrollo de insulinas con mejor respuesta metab&oacute;lica y que se adapten a las necesidades de los pacientes; estas se pueden clasificar en dos grupos, los que presentan modificaciones covalentes como las aciladas con &aacute;cidos grasos, pegiladas, proformas de insulinas y an&aacute;logos hepatoselectivos; y los que involucran cambios en la uni&oacute;n hormona-receptor como la insulina arg N terminal, los complejos con derivados de vanadio y el SCI-57. Cada una de estas con unas caracter&iacute;sticas bioqu&iacute;micas espec&iacute;ficas.</p>      <p><b>5.1. An&aacute;logos con modificaciones covalentes</b></p>  <ol type="a">      <li>Insulinas aciladas con &aacute;cidos grasos. Actualmente est&aacute; siendo estudiada la insulina N&epsilon;-palmitoil-LisB29 (WW99- S32). Tiene un perfil farmacocin&eacute;tico similar a la insulina Detemir, uni&eacute;ndose a la alb&uacute;mina como medio de transporte, aumentando su vida media; estos resultados alentadores aumenta la variedad de insulinas de acci&oacute;n prolongada que hasta la fecha es limitada. Por otro lado, ha sido dise&ntilde;ada la insulina Lis (B29)-litocolildes-(B30), la cual forma una interface apolar en el hex&aacute;mero de insulina aumentando su tiempo de disociaci&oacute;n. Estos derivados acilados presentan poca inmunoreactividad. Algunos ensayos demuestran que la cocristalizaci&oacute;n de la insulina humana con el derivado octanoil-N(&epsilon;)-LisB29 en una proporci&oacute;n 3:1 en presencia de zinc y protamina conduce a una disociaci&oacute;n de los mon&oacute;meros de insulina muy prolongada, estos ensayos han sido realizados en perros pero son altamente prometedores. Estos m&eacute;todos de cristalizaci&oacute;n de insulina con derivados acilados con una liberaci&oacute;n m&aacute;s controlada puede resultar m&aacute;s simples de aplicar en la pr&aacute;ctica cl&iacute;nica en el futuro (37-38).</li>      <li>Insulinas pegiladas. Un m&eacute;todo alternativo de aumentar la vida media de la insulina es su conjugaci&oacute;n con el monoetoxipoli (etileno glicol) electrof&iacute;licamente activado (mPEG) usualmente en la Fen B1 o Lis B29. Esta conjugaci&oacute;n protege a la insulina de la agregaci&oacute;n tisular, aparte de su baja inmunogenicidad en ratas. Esto es debido a que el PEG forma una capa protectora alrededor de la mol&eacute;cula de insulina, protegi&eacute;ndola adem&aacute;s de su degradaci&oacute;n y aumentando su vida media plasm&aacute;tica (39-45).</li>      <li>Proformas de insulinas. Estas preparaciones permanecen en forma inactiva, luego son convertidas a su forma activa despu&eacute;s de su administraci&oacute;n. El compuesto es una prodroga, cualidad que le confiere una actividad prolongada, resistente a las proteasas perif&eacute;ricas y baja inmunogenicidad. El principal an&aacute;logo desarrollado es el 9-fluorenilmetoxicarbonil {(Fmoc)2}. Un Fmoc es unido covalentemente al amino alfa de la fenilalanina de la cadena B y otro en el amino &epsilon; de la lisina B29. B&aacute;sicamente el fundamento de la acci&oacute;n lenta de la insulina se basa en su liberaci&oacute;n prolongada y su baja afinidad con el receptor. Por otro lado la insulina (Fmoc)2 es m&aacute;s resistente a prote&oacute;lisis, puede sufrir una prote&oacute;lisis espont&aacute;nea transform&aacute;ndola a una forma m&aacute;s activa (44). Un an&aacute;logo desarrollado recientemente el {(2 sulfo-9-fluorenilmetoxicarbonil) 3} en combinaci&oacute;n con insulina zinc o protamina provee una acci&oacute;n basal de insulina durante 2 a 3 d&iacute;as despu&eacute;s de su administraci&oacute;n en ratas diab&eacute;ticas (45-46).</li>       <li>An&aacute;logos hepatoselectivos. Estos an&aacute;logos son desarrollados por la uni&oacute;n de tiroxina en el grupo amino alfa de la fenilalanina B1. Tienen una eficacia similar a la insulina NPH y se ha reportado segura su administraci&oacute;n en humanos. Estos an&aacute;logos se unen a la globulina de uni&oacute;n de hormona tiroidea formando un complejo de alto peso molecular que no puede atravesar el endotelio de los tejidos perif&eacute;ricos, sin embargo, este complejo molecular atraviesa las fenestraciones del tejido hep&aacute;tico, conduciendo a un mejor efecto insul&iacute;nico en comparaci&oacute;n a otros an&aacute;logos (47-48).</li>     </ol>      ]]></body>
<body><![CDATA[<p><b>5.2. An&aacute;logos que involucran cambios en la uni&oacute;n hormonareceptor</b></p>  <ol type="a">      <li>Insulina arg N terminal.El segmento amino terminal de la cadena A de la insulina es crucial para la uni&oacute;n de la insulina a su receptor. La adici&oacute;n de arginina al segmento amino terminal altera la estructura tridimensional de la insulina provocando poca uni&oacute;n hormona-receptor. Este cambio f&aacute;rmaco-din&aacute;mico convierte al an&aacute;logo de acci&oacute;n muy lento, convirti&eacute;ndose en un punto clave de investigaci&oacute;n para el desarrollo de insulinas de acci&oacute;n prolongada (49).</li>      <li>Complejos con derivados de vanadio. Se ha demostrado que los complejos piridoninas con sustituciones de vanadio aumentan la uni&oacute;n de la insulina con el receptor, y de este modo su actividad fisiol&oacute;gica. En ratas diab&eacute;ticas, la administraci&oacute;n de insulina en combinaci&oacute;n con vanadio mejora el perfil gluc&iacute;dico. El tratamiento de insulina intraperitoneal en combinaci&oacute;n con el bis (1,2-dihidro-4, 6-dimetil-2-oxo-1- pirimidinolato) oxovanadio (IV) mejora significativamente el control glic&eacute;mico en ratas diab&eacute;ticas. Estos resultados ofrecen grandes expectativas en el campo de la investigaci&oacute;n de compuestos que ayuden a la acci&oacute;n insul&iacute;nica sin modificaciones covalentes de la hormona (50).</li>      <li>SCI-57. Recientemente han sido dise&ntilde;ados los an&aacute;logos monocatenarios. El SCI-57 es dise&ntilde;ado mediante t&eacute;cnicas recombinantes en bacterias. Esta forma mutante de la mol&eacute;cula de insulina presenta 10 veces mayor afinidad con el receptor de insulina y los estudios de cristalograf&iacute;a muestran cambios conformacionales acordes con la activaci&oacute;n de la actividad tirosinkinasa del receptor. Esto se resumir&iacute;a en una mayor eficiencia de acci&oacute;n r&aacute;pida de la insulina ofreciendo excelentes alternativas en terapias de reemplazo hormonal (51).</li>     </ol>      <p>En general, la farmacocin&eacute;tica y farmacodinamia de los an&aacute;logos de insulina en desarrollo ofrece una ventana cl&iacute;nica positiva para el manejo del paciente diab&eacute;tico. Los objetivos de estos an&aacute;logos son simular la acci&oacute;n fisiol&oacute;gica endocrina del p&aacute;ncreas y controlar las funciones glucocontroladoras hep&aacute;ticas. De esta forma la dietoterapia basada en contaje de carbohidratos ser&iacute;a m&aacute;s f&aacute;cil de ajustar de acuerdo al an&aacute;logo que se est&eacute; administrando ya que se contar&iacute;a con una garant&iacute;a absoluta de una acci&oacute;n eficiente y controlada del an&aacute;logo de insulina.</p>      <p><b>5.3. Insulina de pr&oacute;xima utilizaci&oacute;n: Degludec</b></p>      <p>La insulina Degludec es una insulina basal de acci&oacute;n prolongada, se encuentra en estudios fase 3 y ya ha sido aprobada en Europa y Jap&oacute;n. Es id&eacute;ntica a la insulina humana excepto por la deleci&oacute;n del &uacute;ltimo amino&aacute;cido de la cadena B y la adici&oacute;n de un &aacute;cido glut&aacute;mico unido desde la LysB29 al &aacute;cido graso hexadecaenoico. Esta caracter&iacute;stica le permite formar un multihex&aacute;mero en el sitio de inyecci&oacute;n desde el cual los mon&oacute;meros lentamente se separan y son absorbidos.</p>      <p>Esta propiedad le confiere una duraci&oacute;n de m&aacute;s de 40 horas y reduce la variabilidad en las concentraciones plasm&aacute;ticas de insulina comparada con las insulinas basales de dosis diaria (52). La duraci&oacute;n de la acci&oacute;n, la eficacia gluc&eacute;mica y la seguridad de esta insulina Degludeces similar a la de la insulina Glargina tal como lo demostr&oacute; un estudio que compar&oacute; ambas insulinas en 629 pacientes adultos con diabetes tipo 1 y no se encontr&oacute; mayores diferencias (53). Es importante destacar que al comparar glargina y degludec hubo una reducci&oacute;n de los eventos de hipoglucemia usando la segunda (4,4 vs 5,9 episodios por paciente al a&ntilde;o de exposici&oacute;n) (54).</p>      <p><font size="3"><b>Conclusi&oacute;n</b></font></p>      ]]></body>
<body><![CDATA[<p>Las complicaciones agudas relacionadas con la farmacocin&eacute;tica y farmacodinamia inestable de las insulinas cristalinas y NPH han motivado el dise&ntilde;o de an&aacute;logos cuyo perfil farmacol&oacute;gico es el m&aacute;s adecuado para el sistema. El dise&ntilde;o de an&aacute;logos de insulina hasta la fecha est&aacute; en constante investigaci&oacute;n y desarrollo con el fin de obtener un control metab&oacute;lico &oacute;ptimo en pacientes diab&eacute;ticos. Sin embargo, las oscilaciones fisiol&oacute;gicas de la insulina siguen siendo un reto para los bioqu&iacute;micos, encargados del &aacute;rea de dise&ntilde;o de an&aacute;logos.</p>      <p>La terapia m&aacute;s aceptada en la diabetes mellitus tipo 1 es la combinaci&oacute;n de insulinas de acci&oacute;n ultra r&aacute;pida con una de acci&oacute;n prolongada para simular las dos fases de secreci&oacute;n de insulina en sujetos sanos. En pacientes diab&eacute;ticos tipo 2, el uso de las insulinas de acci&oacute;n prolongada permite un estricto control metab&oacute;lico, en etapas donde la masa de c&eacute;lulas betas pancre&aacute;ticas es escasa, adem&aacute;s, siendo &uacute;tiles para la prevenci&oacute;n de episodios de hipoglicemias nocturnas en diab&eacute;ticos tipo 1 y 2.</p>      <p><b>Conflicto de intereses</b></p>      <p>Los autores declaran no tener conflicto de inter&eacute;s.</p>  <hr>      <p><font size="3"><b>Referencias</b></font></p>      <!-- ref --><p>1. World Health Organization. Diabetes. Fact sheet No312. &#91;Internet&#93;. G&eacute;neva: World Health Organization; 2011. 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