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- W2000288403 abstract "Exposure to high concentrations of oxygen has previously been shown to cause growth arrest in A549 cells, a distal lung epithelial cell line. We found that when A549 cells were exposed to 95% oxygen they underwent substantial growth inhibition. This was associated with induction of p21(Waf1/Cip1/Sdi1) protein and a decrease in cyclin B1 protein. Flow cytometry revealed that A549 cells exposed to hyperoxia had a significant decrease in the percentage of cells in G(1) and a modest but significant increase in the percentage of cells in S phase and G(2)/M, consistent with cells entering S phase. A549 cells in room air and hyperoxia were then treated with nocodazole, a mitotic inhibitor. Room air A549 cells treated with nocodazole showed a marked increase in G(2)/M consistent with mitotic arrest. In contrast, hyperoxic treated cells had a modest but significant decrease in G(1) but only a minimal increase in G(2)/M consistent with partial G(1)/S arrest and growth inhibition in S phase. To further investigate the role of p21(Waf1/Cip1/Sdi1) as a checkpoint regulator during hyperoxic growth inhibition, HCT116 cells with wild-type and null p21(Waf1/Cip1/Sdi1) were exposed to hyperoxia. Both wild-type p21(+/+) cells and null p21(-/-) cells underwent growth inhibition when exposed to hyperoxia. At 48 h the hyperoxic treated HCT116 p21(+/+) had a similar cell cycle distribution as the hyperoxic treated HCT116 p21(-/-) cells, suggesting that p21(Waf1/Cip1/Sdi1) may not be essential for growth arrest during hyperoxia. These findings suggest that hyperoxia causes partial growth arrest at different phases of the cell cycle but primarily in S phase, that hyperoxic growth arrest is associated with a decrease in cyclin B1 protein and that p21 induction may not be essential for hyperoxic growth arrest." @default.
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- W2000288403 date "2001-02-01" @default.
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- W2000288403 title "Growth arrest in A549 cells during hyperoxic stress is associated with decreased cyclin B1 and increased p21Waf1/Cip1/Sdi1 levels" @default.
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- W2000288403 doi "https://doi.org/10.1016/s0167-4889(00)00142-7" @default.
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