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• W2950401054 abstract "The chronic elevation of angiotensin II (Ang II) is an important cause of endothelial dysfunction (ED). The Ang II/type 1 receptor (AT1R) signaling pathway can cause endothelial nitric oxide synthase (eNOS)/nitric oxide (NO) dysfunction through various mechanisms leading to ED. The modulation of eNOS phosphorylated at Ser1177 is an important mechanism upregulating eNOS activity. Protein phosphatase 2 A (PP2A) has been reported to dephosphorylate eNOS at Ser1177. The PP2A inhibitor 2 protein (I2PP2A) is a specific endogenous inhibitor that binds the catalytic subunit of PP2A and directly inhibits PP2A activity. Therefore, we hypothesized that Ang II might attenuate I2PP2A expression to activate PP2A, which downregulates eNOS Ser 1177 phosphorylation, leading to eNOS dysfunction. In our study, we used Ang II-treated human umbilical vein endothelial cells (HUVECs) and, found that the eNOS Ser1177 phosphorylation levels were downregulated, the activity of PP2A was increased, and I2PP2A expression was decreased. Furthermore, these effects were blocked by candesartan (CAN). The phosphorylation levels of eNOS Ser1177 were decreased after I2PP2A was knocked down by specific siRNA but increased after I2PP2A overexpression. We also found that the Ang II treatment decreased the association of I2PP2A with PP2A but increased the association between PP2A and eNOS. Taken together, our results suggest that Ang II activates PP2A by downregulating the I2PP2A expression through the AT1R signaling pathway leading to the loss of eNOS Ser1177 phosphorylation and ED." @default.
• W2950401054 created "2019-06-27" @default.
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• W2950401054 date "2019-08-01" @default.
• W2950401054 modified "2023-09-26" @default.
• W2950401054 title "Roles of I2PP2A in the downregulation of eNOS Ser1177 phosphorylation by angiotensin II-activated PP2A" @default.
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• W2950401054 doi "https://doi.org/10.1016/j.bbrc.2019.06.063" @default.
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