AIMS: Although uncoupling protein 2 (UCP2) negatively regulates intracellular reactive oxygen species (ROS) production and protects vascular function, its participation in vascular benefits of drugs used to treat cardiometabolic diseases is largely unknown. This study investigated whether UCP2 and associated oxidative stress reduction contribute to the improvement of endothelial function by a dipeptidyl peptidase-4 inhibitor, sitagliptin, in hypertension. RESULTS: Pharmacological inhibition of cyclooxygenase-2 (COX-2) but not COX-1 prevented endothelial dysfunction, and ROS scavengers reduced COX-2 mRNA and protein expression in spontaneously hypertensive rats (SHR) renal arteries. Angiotensin II (Ang II) evoked endothelium-dependent contractions (EDCs) in C57BL/6 and UCP2 knockout (UCP2KO) mouse aortae. Chronic sitagliptin administration attenuated EDCs in SHR arteries and Ang II-infused C57BL/6 mouse aortae and eliminated ROS overproduction in SHR arteries, which were reversed by glucagon-like peptide 1 receptor (GLP-1R) antagonist exendin 9-39, AMP-activated protein kinase (AMPK)α inhibitor compound C, and UCP2 inhibitor genipin. By contrast, sitagliptin unaffected EDCs in Ang II-infused UCP2KO mice. Sitagliptin increased AMPKα phosphorylation, upregulated UCP2, and downregulated COX-2 expression in arteries from SHR and Ang II-infused C57BL/6 mice. Importantly, exendin 9-39, compound C, and genipin reversed the inhibitory effect of GLP-1R agonist exendin-4 on Ang II-stimulated mitochondrial ROS rises in SHR endothelial cells. Moreover, exendin-4 improved the endothelial function of renal arteries from SHR and hypertensive patients. INNOVATION: We elucidate for the first time that UCP2 serves as an important signal molecule in endothelial protection conferred by GLP-1-related agents. UCP2 could be a useful target in treating hypertension-related vascular events. CONCLUSIONS: UCP2 inhibits oxidative stress and downregulates COX-2 expression through GLP-1/GLP-1R/AMPKα cascade.
AIMS: Although uncoupling protein 2 (UCP2) negatively regulates intracellular reactive oxygen species (ROS) production and protects vascular function, its participation in vascular benefits of drugs used to treat cardiometabolic diseases is largely unknown. This study investigated whether UCP2 and associated oxidative stress reduction contribute to the improvement of endothelial function by a dipeptidyl peptidase-4 inhibitor, sitagliptin, in hypertension. RESULTS: Pharmacological inhibition of cyclooxygenase-2 (COX-2) but not COX-1 prevented endothelial dysfunction, and ROS scavengers reduced COX-2 mRNA and protein expression in spontaneously hypertensiverats (SHR) renal arteries. Angiotensin II (Ang II) evoked endothelium-dependent contractions (EDCs) in C57BL/6 and UCP2 knockout (UCP2KO) mouse aortae. Chronic sitagliptin administration attenuated EDCs in SHR arteries and Ang II-infused C57BL/6 mouse aortae and eliminated ROS overproduction in SHR arteries, which were reversed by glucagon-like peptide 1 receptor (GLP-1R) antagonist exendin 9-39, AMP-activated protein kinase (AMPK)α inhibitor compound C, and UCP2 inhibitor genipin. By contrast, sitagliptin unaffected EDCs in Ang II-infused UCP2KO mice. Sitagliptin increased AMPKα phosphorylation, upregulated UCP2, and downregulated COX-2 expression in arteries from SHR and Ang II-infused C57BL/6 mice. Importantly, exendin 9-39, compound C, and genipin reversed the inhibitory effect of GLP-1R agonist exendin-4 on Ang II-stimulated mitochondrial ROS rises in SHR endothelial cells. Moreover, exendin-4 improved the endothelial function of renal arteries from SHR and hypertensivepatients. INNOVATION: We elucidate for the first time that UCP2 serves as an important signal molecule in endothelial protection conferred by GLP-1-related agents. UCP2 could be a useful target in treating hypertension-related vascular events. CONCLUSIONS:UCP2 inhibits oxidative stress and downregulates COX-2 expression through GLP-1/GLP-1R/AMPKα cascade.
Authors: Alan Garber; Robert Henry; Robert Ratner; Pedro A Garcia-Hernandez; Hiromi Rodriguez-Pattzi; Israel Olvera-Alvarez; Paula M Hale; Milan Zdravkovic; Bruce Bode Journal: Lancet Date: 2008-09-24 Impact factor: 79.321
Authors: Michael E Widlansky; Venkata K Puppala; Tisha M Suboc; Mobin Malik; Amberly Branum; Kara Signorelli; Jingli Wang; Rong Ying; Michael J Tanner; Sudhi Tyagi Journal: Vasc Med Date: 2017-02-01 Impact factor: 3.239
Authors: Yang Zhang; Jian Liu; Jiang-Yun Luo; Xiao Yu Tian; Wai San Cheang; Jian Xu; Chi Wai Lau; Li Wang; Wing Tak Wong; Chi Ming Wong; Hui Yao Lan; Xiaoqiang Yao; Mohan K Raizada; Yu Huang Journal: Antioxid Redox Signal Date: 2015-05-14 Impact factor: 8.401
Authors: Nathan C Winn; Zachary I Grunewald; Michelle L Gastecki; Makenzie L Woodford; Rebecca J Welly; Stephanie L Clookey; James R Ball; T'Keaya L Gaines; Natalia G Karasseva; Jill A Kanaley; Harold S Sacks; Victoria J Vieira-Potter; Jaume Padilla Journal: Am J Physiol Endocrinol Metab Date: 2017-06-27 Impact factor: 4.310
Authors: Chak Kwong Cheng; Jiang-Yun Luo; Chi Wai Lau; William Chi-Shing Cho; Chi Fai Ng; Ronald Ching Wan Ma; Xiao Yu Tian; Yu Huang Journal: Acta Pharmacol Sin Date: 2021-01-25 Impact factor: 7.169