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GLP-1 attenuates Ang II-induced proliferation and migration in rat aorta smooth muscle cells via inhibition of the RhoA/ROCK2 signaling pathway.
Die Pharmazie 2018 December 2
Glucagon-like peptide 1 (GLP-1), a neuroendocrine hormone produced by the gastrointestinal tract, plays a significant role in blood glucose regulation; drugs derived from GLP-1 are currently used for the treatment of type 2 diabetes. In addition to regulating glucose homeostasis, the protective effects of GLP-1 on the cardiovascular system are also of interest. However, the vascular protective mechanisms of GLP-1 remain unclear. The present study was designed to evaluate the role of GLP-1 in the proliferation and migration of vascular smooth muscle cells, and the underlying mechanisms. In this study, proliferation, migration, cyclin D1 expression, and phosphorylation of MLC, as well as RhoA and Rho-associated coiled-coil forming protein kinase 2 (ROCK2) expression, were increased in rat aorta smooth muscle cells (RASMCs) following incubation with angiotensin II (Ang II). These effects were significantly attenuated by GLP-1, forskolin (a cAMP activator) and Y-27632 (a ROCK2 inhibitor). However, H89 (a PKA inhibitor) inhibited the action of GLP-1, both in terms of inhibition of RASMC proliferation and migration, and RHOA/ROCK2 expression. These results indicate that GLP-1 inhibits Ang II-induced RASMC proliferation and migration via the cAMP/PKA/RhoA/ROCK2 signaling pathway. Our data suggest that GLP-1 should be considered for use in the clinical treatment of cardiovascular diseases, in addition to its current use in the treatment of diabetes mellitus.
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