PMID: 9176561May 1, 1997Paper

Melatonin protects mice infected with Venezuelan equine encephalomyelitis virus

Cellular and Molecular Life Sciences : CMLS
E BonillaL Chacín-Bonilla

Abstract

We investigated whether the administration of melatonin (MLT) reduces the death rate and evolution of the disease in mice infected with Venezuelan equine encephalomyelitis (VEE) virus. Our results show that, MLT protects mice infected with the virus. The mortality rate was reduced from 100% to 16% merely by increasing the dose from 0 to 1000 micrograms/MLT per kg body weight MLT significantly postponed the onset of the disease and death by several days. In surviving mice very high titres of VEE virus IgM antibodies were found seven weeks after virus inoculation. MLT significantly reduced VEE virus levels in blood and brain of infected mice and increased the survival rate when the length of pretreatment was augmented from 3 to 7 or 10 days before virus inoculation. Serum levels of interleukin-2 were not affected by MLT administration. In control mice receiving MLT as well as in infected mice treated or non-treated with MLT, interferon gamma levels in sera were increased. Interleukin-4 concentrations were found to be elevated in sera of non-infected mice receiving MLT, but did not differ from controls in infected mice treated or non-treated with the hormone. MLT reduced the degree of cell destruction produced by VEE virus in cult...Continue Reading

Citations

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