Los contaminantes ambientales bifenilos policlorinados (PCB) y sus efectos sobre el Sistema Nervioso y la salud

Carolina Miller-Pérez; Eduardo Sánchez-Islas; Samuel Mucio-Ramírez; José Mendoza-Sotelo; Martha León-Olea

2009, Número 4

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Salud Mental 2009; 32 (4)

Los contaminantes ambientales bifenilos policlorinados (PCB) y sus efectos sobre el Sistema Nervioso y la salud

Miller-Pérez C, Sánchez-Islas E, Mucio-Ramírez S, Mendoza-Sotelo J, León-Olea M

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RESUMEN

La contaminación ambiental es un grave problema mundial que actualmente preocupa a la comunidad internacional. Las grandes ciudades industrializadas, como la de México, son las más contaminadas. Sin embargo, la contaminación llega hasta zonas alejadas de donde se produce y afecta los ecosistemas. La contaminación es responsable de una alarmante y creciente lista de enfermedades en el hombre, los animales y las plantas. Los bifenilos policlorados (PCB) se catalogaron dentro de los 12 contaminantes orgánicos más tóxicos para los organismos vivos. Sus propiedades físicas hicieron que se usaran ampliamente en la industria. No son biodegradables y se acumulan en el ambiente, se transfieren dentro de la cadena alimenticia y tienden a concentrarse más al final de ésta, por lo que en los alimentos se determinaron concentraciones que sobrepasaban los límites establecidos por el Organismo de Protección del Ambiente de los Estados Unidos. Se demostró que los PCB afectan la función de los sistemas endocrino, inmunológico y nervioso, entre otros. El mecanismo de acción descrito para los PCB, es por medio de la activación del receptor aril hidrocarburo, un factor de transcripción citosólico dependiente de ligando. Los PCB actúan como ligandos y son lipofílicos, por lo que entran a la célula y llegan al núcleo para unirse al ADN, lo cual altera la trascripción de genes específicos y provoca alteraciones genéticas que conducen a cambios en los procesos y funciones celulares. Los PCB interfieren con la producción y regulación de las hormonas esteroides y tiroideas al actuar como antagonistas o agonistas de los receptores hormonales. Afectan la función reproductora y alteran diferentes aspectos de la sexualidad. Como otros grupos de investigación, el nuestro ha observado que la administración de PCB a ratas gestantes causa un incremento de la mortalidad de las crías, pérdida fetal, peso corporal bajo y una reducción en el número de machos por camada. Los PCB actúan como inmunotoxinas que causan la atrofia del timo y afectan la respuesta inmune. Los PCB y sus metabolitos son carcinogénicos debido a la generación de especies reactivas de oxígeno que pueden producir daño oxidativo al ADN, provocar aberraciones cromosómicas y generar cáncer de mama, hígado, tracto biliar, gastrointestinal, cerebral, etc. Los organismos son más vulnerables a la exposición de los PCB durante las etapas tempranas del desarrollo embrionario. Los PCB atraviesan la placenta y llegan al feto, permanecen en la leche materna y mantienen niveles altos en las crías. Los PCB afectan así el desarrollo del Sistema Nervioso, los órganos y los tejidos, y pueden llevar a la pérdida fetal. También se asocian a deficiencias en el neurodesarrollo del niño y a alteraciones neuropsicológicas en la atención, el aprendizaje y el desarrollo psicomotor. La exposición aguda o crónica a los PCB se asocia con cefalea, insomnio, nerviosismo, irritabilidad, depresión y ansiedad. Los PCB participan en el proceso de neurodegeneración al afectar el sistema dopaminérgico. En el nivel neurofisiológico, afectan la transmisión sináptica excitatoria e inhibitoria hipocampal; inhiben la potenciación a largo plazo y la plasticidad sináptica; alteran mecanismos de señalización celular como el GABAérgico, en el aprendizaje y la memoria, y producen alteraciones cognoscitivas. Nuestro grupo demostró que la administración de los PCB durante la gestación inhibe la actividad de la enzima sintasa del óxido nítrico y provoca cambios neuronales morfológicos degenerativos en los núcleos paraventricular y supraóptico hipotalámicos. Las evidencias de los estudios realizados con los PCB son concluyentes en cuanto a que la exposición a estos tóxicos ambientales interfiere con el funcionamiento de diferentes órganos y a que sistemas y a que son un factor de riesgo para un amplio número de alteraciones neurodegenerativas. Actualmente, las poblaciones están expuestas a concentraciones que exceden los niveles límite tolerables recomendados por la Organización Mundial de la Salud. Nuestro grupo está analizando las alteraciones de estos contaminantes en el nivel neuroendocrino y en algunos aspectos del aprendizaje y la memoria. Dada la relevancia de los efectos de los PCB en la salud y de la falta en México de una valoración de los niveles de los PCB existentes en personas y alimentos, es importante que las instituciones de salud fomenten y apoyen las investigaciones en esta área.

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