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Vitamin C inhibits benzoapyrene-induced cell cycle changes partly via cyclin D1/E2F pathway in human embryo lung fibroblasts / 生物医学与环境科学(英文)
Biomedical and Environmental Sciences ; (12): 239-244, 2006.
Article in English | WPRIM | ID: wpr-229695
ABSTRACT
<p><b>OBJECTIVE</b>To study the molecular mechanism of the inhibitory effects of vitamin C on benzo[a]pyrene (B[a]P)-induced changes of cell cycle in human embryo lung fibroblast (HELF) cells.</p><p><b>METHODS</b>The stable transfectants, HELF transfected with antisense cyclin D1 and antisense CDK4, were established. Cells were cultured and pretreated with vitamin C before stimulation with B[a]P for 24 h. The expression levels of cyclin D1, CDK4, E2F1, and E2F4 were determined by Western blot. Flow cytometric analysis was employed to detect the distributions of cell cycle.</p><p><b>RESULTS</b>B[a]P significantly elevated the expression levels of cyclin D1, E2F1, and E2F4 in HELF cells. Vitamin C decreased the expression levels of cyclin D1, E2F1, and E2F4 in B[a]P-stimulated HELF cells. Dose-dependent relationships were not found between the different concentrations of vitamin C (10, 100, 500, 1000, and 5000 micromol/L) and the expression levels of cyclin D1, E2F1, and E2F4 in HELF cells. The expression levels of cyclin D1, E2F1, and E2F4 in B[a]P-treated transfectants were lower than those in B[a]P-treated HELF cells. The expression levels of cyclin D1 and E2F4 treated with vitamin C and antisense cyclin D1 were decreased compared with those treated with antisense cyclin D1 alone. The effects of vitamin C combined with antisense CDK4 on the expression levels of cyclin D1 and E2F1/E2F4 were similar to those of antisense CDK4 alone. B[a]P progressed HELF cells from G1 to S phase. Both vitamin C and antisense cyclin D1 suppressed the changes of cell cycle progressed by B[a]P. However, antisense CDK4 did not attenuate the above changes. Vitamin C combined with antisense CDK4 markedly suppressed B[a]P-induced changes of cell cycle as compared with antisense CDK4. But the inhibitory effects of vitamin C combined with antisense cyclin D1 on B[a]P-induced changes of cell cycle were similar to those of vitamin C alone or antisense cyclin D1 alone.</p><p><b>CONCLUSIONS</b>B[a]P progressed HELF cells from G1 to S phase via intracellular signaling pathway of cyclin D1/E2F. Vitamin C may modulate this signaling pathway to protect cells from injury caused by B[a]P.</p>
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Pharmacology / Physiology / Ascorbic Acid / Benzo(a)pyrene / Transfection / Cell Cycle / Cells, Cultured / Embryology / Blotting, Western / G1 Phase Limits: Humans Language: English Journal: Biomedical and Environmental Sciences Year: 2006 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Pharmacology / Physiology / Ascorbic Acid / Benzo(a)pyrene / Transfection / Cell Cycle / Cells, Cultured / Embryology / Blotting, Western / G1 Phase Limits: Humans Language: English Journal: Biomedical and Environmental Sciences Year: 2006 Type: Article