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The FASEB Journal, Vol 10, 882-890, Copyright © 1996 by The Federation of American Societies for Experimental Biology


RESEARCH COMMUNICATIONS

Neurohormone melatonin prevents cell damage: effect on gene expression for antioxidant enzymes

I Antolin, C Rodriguez, RM Sainz, JC Mayo, H Uria, ML Kotler, MJ Rodriguez- Colunga, D Tolivia and A Menendez-Pelaez
Departamento de Morfologia y Biologia Celular, Universidad de Oviedo,Spain.

It is well known that porphyrins cause a toxic light-mediated effect due to their capability to generate free radicals. Several reports have proved that melatonin is a potent free radical scavenger. The aim of this work has been to study the ability of melatonin to prevent the cell damage caused by porphyrins in the Harderian gland of female Syrian hamsters. Cell injury was evaluated estimating the percentage of damaged cells found in the gland and analyzing the degree of this damage at ultrastructural level. To explain the mechanism by which this hormone could prevent the cell damage caused by porphyrins, its capability to both decrease porphyrin synthesis and increase the mRNA levels for antioxidant enzymes was evaluated. Our results demonstrate that melatonin administration decreases the percentage of damaged cells, porphyrin synthesis, and aminolevulinate synthase (ALA-S) mRNA levels and increases the mRNA levels for manganese superoxide-dismutase and copper-zinc superoxide dismutase. When observed under an electron microscope, the lesions in the clear cells of the treated females were much less severe than in the corresponding cells of the control animals. Melatonin exerts a cytoprotective effect by inhibiting the ALA- S gene expression (and so porphyrin synthesis) and by raising the mRNA levels for several antioxidant enzymes.


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