Melatonina
La melatonina o N-acetil-5-metoxitriptamina es una ormona amassada en totes los organismes vivents, en concentracions que vàrian segon lo cicle diürne/nocturne. La melatonina se sintetiza a partir del neurotransmetor serotonina. Se produsís, principalament, en la glandula pineala, e participa a una granda varietat de procèsses cellulars, neuroendocrins e neurofisiologics. Una de las caracteristicas mai particularas per çò qu'es de la biosintèsi pineala de melatonina es sa variabilitat al cors del cicle de 24 oras, e sa responsa precisa a cambiaments d'illuminacion. Per aquela rason, la melatonina se considèra una neuroormona amb foncion apertienta en la fisiologia circadiana. Fòrces de sos efièches biologics se devon a son accion suls receptors de la melatonina e d'autras mai a son accion potenta coma antioxidant, que jòga un ròtle fòrça especial en la proteccion de l'ADN nuclear e mitocondrial.
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