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- W3208137674 abstract "Airway smooth muscle thickening, a key characteristic of chronic asthma, is largely attributed to increased smooth muscle cell proliferation and reduced smooth muscle apoptosis. Polo-like kinase 1 (Plk1) is a serine/threonine protein kinase that participates in the pathogenesis of airway smooth muscle remodeling. Although the role of Plk1 in cell proliferation and migration is recognized, its function in smooth muscle apoptosis has not been previously investigated. Caspase-9 (Casp9) is a key enzyme that participates in the execution of apoptosis. Casp9 phosphorylation at Ser-196 and Thr-125 is implicated in regulating its activity in cancer cells and epithelial cells. Here, exposure of human airway smooth muscle (HASM) cells to platelet-derived growth factorfor 24 hours enhanced the expression of Plk1 and Casp9 phosphorylation at Ser-196, but not Thr-125. Overexpression of Plk1 in HASM cells increased Casp9 phosphorylation at Ser-196. Moreover, the expression of Plk1 increased the levels of pro-Casp9 and pro-Casp3 and inhibited apoptosis, demonstrating a role of Plk1 in inhibiting apoptosis. Knockdown of Plk1 reduced Casp9 phosphorylation at Ser-196, reduced pro-Casp9/3 expression, and increased apoptosis. Furthermore, Casp9 phosphorylation at Ser-196 was upregulated in asthmatic HASM cells, which was associated with increased Plk1 expression. Knockdown of Plk1 in asthmatic HASM cells decreased Casp9 phosphorylation at Ser-196 and enhanced apoptosis. Together, these studies disclose a previously unknown mechanism that the Plk1-Casp9/3 pathway participates in the controlling of smooth muscle apoptosis." @default.
- W3208137674 created "2021-11-08" @default.
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- W3208137674 date "2022-02-01" @default.
- W3208137674 modified "2023-10-13" @default.
- W3208137674 title "Plk1 Regulates Caspase-9 Phosphorylation at Ser-196 and Apoptosis of Human Airway Smooth Muscle Cells" @default.
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- W3208137674 doi "https://doi.org/10.1165/rcmb.2021-0192oc" @default.
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