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- W1999861262 abstract "Benzo[a]pyrene (B[a]P), a well-known carcinogen, is widespread in the environment. Although the neurotoxic effect of B[a]P has not drawn much attention, toxic effects of B[a]P on learning and memory have been reported. Since it is well known that neuronal apoptosis plays a major role in impairment of learning and memory triggered by many stimuli, an effort has been made to examine whether the B[a]P-induced neurotoxicity occurs through mitochondria-mediated apoptosis. Cultured newborn rat cerebral neurons were used to clarify the apoptosis induced by B[a]P in the study. After incubating with different doses of B[a]P in presence of S9 for 40 h, the apoptotic rates of B[a]P-treated neurons increased in a dose-dependent manner. Further analysis showed that B[a]P-induced apoptosis was accompanied by loss of mitochondrial membrane potential, release of cytochrome c from mitochondria to the cytosol, downregulation of antiapoptotic protein B-cell lymphoma-2 (Bcl-2) levels with concurrent upregulation in proapoptotic Bcl-2-associated X protein (Bax) levels, and increase in the levels and activities of caspases-9 and -3. However, there was no difference in the activity of caspase-8 between B[a]P-exposed neurons and controls. Collectively, these results showed that B[a]P upregulates Bax and downregulates Bcl-2 expression in cultured cerebral neurons, which leads to mitochondrial release of cytochrome c, caspase-3 activation and neuronal apoptotic death." @default.
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- W1999861262 date "2013-07-09" @default.
- W1999861262 modified "2023-10-12" @default.
- W1999861262 title "Involvement of mitochondrial pathway in benzo[a]pyrene-induced neuron apoptosis" @default.
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- W1999861262 doi "https://doi.org/10.1177/0960327113493301" @default.
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