Alcohol y metabolismo humano
DOI:
https://doi.org/10.20882/adicciones.541Palabras clave:
alcohol, acetaldehido, metabolismo, biotransformaciónResumen
Uno de los propósitos del presente trabajo es llevar a cabo una revisión actualizada y resumida de los aspectos más relevantes de los procesos de absorción, distribución, biotransformación (metabolismo) y excreción del alcohol. Aunque con variaciones individuales importantes, el alcohol se absorbe mayoritariamente a nivel intestinal, se distribuye por el organismo de forma análoga a la del agua corporal, y se metaboliza en su mayor parte. Dado que la biotransformación fundamental del etanol se produce mediante un metabolismo enzimático oxidativo, hemos reservado un apartado para analizar, en la medida de lo posible, los sistemas enzimáticos responsables de dicha oxidación. Asimismo, con este capítulo hemos querido ofrecer un resumen de los datos disponibles sobre la implicación del acetaldehido, primer metabolito oxidativo del etanol, en los efectos del alcohol. Dicha implicación no se reduce, como tradicionalmente se ha creído, a los efectos tóxicos derivados del consumo de alcohol. Por el contrario, existe un corpus de conocimientos experimentales cada vez más sólido que relaciona al acetaldehido con los efectos euforizantes del alcohol y, en consecuencia, con la capacidad de esta droga de establecer un patrón de consumo repetido. Finalmente, se revisan las interacciones que pueden ocurrir entre el metabolismo del alcohol y la biotransformación de otras sustancias. Dichas interacciones pueden tener lugar siempre que sustancias endógenas o exógenas compartan con el etanol los mismos sistemas enzimáticos. En este sentido, merece especial atención la inducción del P-450 2E1 y otros citocromos P-450 en las células hepáticas provocada por el consumo crónico de alcohol.Citas
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