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- W1846963597 abstract "Nicotine, the addictive component of tobacco, is thought to be at least partially responsible for the deleterious effects of smoking such as heart disease and cancer. Evidence shows that nicotine is an immunomodulator and that one of its possible mechanisms is regulation of apoptosis, or programmed cell death, in immune cells. This study examined the effects and the mechanisms of action of nicotine on dexamethasone (DEX)-induced apoptosis in murine immune cells by examining the expression of levels of the 17-kDa active caspase-3, a marker of apoptosis. Thymocytes and splenocytes from adult BALB/c female mice were incubated with concentrations of nicotine correlating to those found in the blood and tissue of smokers (0.01 microg/ml [0.022 microM] and 1 microg/ml [2.2 microM]), concurrently with 100 nM DEX, to induce apoptosis. Cytosolic protein fractions were analyzed by Western blotting with polyclonal antibodies that recognize the active form of caspase-3. The data showed that nicotine significantly blocked the formation of the DEX-induced 17-kDa caspase-3 subunit expression. This downregulation ranged from 65% to 100% of the active caspase-3 expressed in cultures treated with DEX alone. Addition of d-tubocurarine chloride (dTC), a general nicotinic receptor antagonist, inhibited nicotine downregulation of the DEX-induced active caspase-3 expression, providing evidence that this action of nicotine was receptor-mediated. These data support that nicotine is an important immunomodulator at the level of immune cell apoptosis, a process thought to be a contributory mechanism of autoimmunity, cardiovascular disease, and carcinogenesis." @default.
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- W1846963597 date "2001-10-01" @default.
- W1846963597 modified "2023-10-16" @default.
- W1846963597 title "Nicotine Inhibition of Apoptosis in Murine Immune Cells" @default.
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- W1846963597 doi "https://doi.org/10.1177/153537020122601011" @default.
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