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- W1997979647 abstract "The multifunctional enzyme tissue transglutaminase (TG2) contributes to the development and progression of several cardiovascular diseases. Extracellular rather than intracellular TG2 is enzymatically active, however, the mechanism by which it is exported out of the cell remains unknown. Nitric oxide (NO) is shown to constrain TG2 externalization in endothelial and fibroblast cells. Here, we examined the role of both exogenous and endogenous (endothelial cell-derived) NO in regulating TG2 localization in vascular cells and tissue. NO synthase inhibition in endothelial cells (ECs) using N-nitro L-arginine methyl ester (L-NAME) led to a time-dependent decrease in S-nitrosation and increase in externalization of TG2. Laminar shear stress led to decreased extracellular TG2 in ECs. S-nitrosoglutathione treatment led to decreased activity and externalization of TG2 in human aortic smooth muscle and fibroblast (IMR90) cells. Co-culture of these cells with ECs resulted in increased S-nitrosation and decreased externalization and activity of TG2, which was reversed by L-NAME. Aged Fischer 344 rats had higher tissue scaffold-associated TG2 compared to young. NO regulates intracellular versus extracellular TG2 localization in vascular cells and tissue, likely via S-nitrosation. This in part, explains increased TG2 externalization and activity in aging aorta." @default.
- W1997979647 created "2016-06-24" @default.
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- W1997979647 date "2011-10-08" @default.
- W1997979647 modified "2023-09-27" @default.
- W1997979647 title "Nitric oxide regulates tissue transglutaminase localization and function in the vasculature" @default.
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- W1997979647 doi "https://doi.org/10.1007/s00726-011-1090-0" @default.
- W1997979647 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3744185" @default.
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