Abstract
The authors investigated the protective effects of a novel astrocyte-modulating agent, arundic acid, in a 1-methyl-4-phenyl-1,2,3,6-tetrahyropyridine (MPTP) mouse model of Parkinson's disease. Male mice received four intraperitoneal (i.p.) injections of MPTP (20 mg/kg) at 2 h intervals. The content of dopamine and its metabolites in the striatum was reduced markedly 7 days after MPTP treatment. The delayed treatment with arundic acid (30 mg/kg, i.p.) administered 3, 4, 5 and 6 days after MPTP treatment did not affect the depletion of dopamine and its metabolites in the striatum. Our immunohistochemical study with anti-tyrosine hydroxylase antibody, anti-neuronal nuclei antibody, anti-glial fibrillary acidic protein antibody, anti-S 100beta antibody and anti-nestin antibody showed that the delayed treatment with arundic acid had a protective effect against MPTP-induced neuronal damage in the striatum and the substantia nigra of mice. Furthermore, this agent ameliorated the severe reductions in number of isolectin reactive microglia in the striatum and the substantia nigra 7 days after MPTP treatment. These results demonstrate that the inhibition of S 100beta synthesis in astrocytes may be the major component of the beneficial ef...Continue Reading
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