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- W2091134248 abstract "Previously, we demonstrated that nuclear localization of the Angiotensin II AT1A receptor was associated with the activation of transcription for the COX-2 gene, PTGS-2. The hypothesis of the present study is that AT1AR internalization from the plasma membrane is a first step in the nuclear localization of the endogenous AT1AR of rat aortic vascular smooth muscle cells and the resultant increase of COX-2 protein expression. Angiotensin II produced both a time- and concentration-dependent increase in COX-2 protein expression in these cells. Treatment with sucrose or phenylarsine oxide, inhibitors of receptor internalization, significantly inhibited AT1AR internalization and abolished the increase in COX-2 protein produced by Angiotensin II without affecting COX-2 expression on its own. Sucrose pre-treatment of rat aortic vascular smooth muscle cells resulted in an increase in p42/44 and p38 activation, while phenylarsine oxide pre-treatment activated only p38 kinase without inhibiting activation of p42/44 produced by Angiotensin II. These results demonstrate that inhibiting the internalization of the AT1AR results in a loss of ability of Angiotensin II to increase the protein expression of COX-2, thus supporting previous work showing a relationship between AT1AR nuclear localization and activation of COX-2 gene expression. Surprisingly, in contrast to other studies, the data also indicates that activation of p42/44 and/or p38 does not correlate with the increased expression of COX-2." @default.
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- W2091134248 date "2008-06-01" @default.
- W2091134248 modified "2023-09-27" @default.
- W2091134248 title "COX-2 expression stimulated by Angiotensin II depends upon AT1 receptor internalization in vascular smooth muscle cells" @default.
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- W2091134248 doi "https://doi.org/10.1016/j.bbamcr.2008.01.012" @default.
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