title: CCL5 upregulates activation of AMP-activated protein kinases in vascular smooth muscle cells of spontaneously hypertensive rats.
abstract: AMP-activated protein kinase (AMPK) activation plays a central role in cellular metabolic homeostasis. Although AMPK is known for its roles in energy homeostasis, numerous recent studies have suggested broader protective roles in inflammation and hypertension. Chemokine CCL5 has shown down-regulatory effects on angiotensin II (Ang II)-induced hypertensive mediators as well as VSMCs proliferation in spontaneously hypertensive rats (SHR) VSMCs. In the present study, we investigated the relationship between CCL5 and AMPK in the anti-hypertensive effects of CCL5 in SHR VSMCs. CCL5 increased AMPK phosphorylation and attenuated Ang II-induced AMPK inhibition. AMPK activation induced by CCL5 was mediated mainly through the AT2 R pathway. Activation of dimethylarginine dimethylaminohydrolase (DDAH)-1 by CCL5 resulted in AMPK activation as well as attenuation of Ang II-induced AMPK inhibition. In addition, AMPK activation induced by CCL5 was partially responsible for the inhibitory effects of CCL5 on Ang II-induced 12-lipoxygenase (12-LO) and endothelin (ET)-1 expression, and the inhibitory effect of CCL5 on Ang II-induced VSMCs proliferation was also mediated via AMPK activation in SHR VSMCs. In conclusion, CCL5 induces activation of AMPK via DDAH-1 activity in SHR VSMCs, and activation of AMPK is partially responsible for the inhibitory effects of CCL5 on Ang II-induced hypertensive mediators. These results suggest that activation of AMPK by CCL5 potentially expands the anti-hypertensive role of CCL5 in SHR VSMCs.
authors.affiliation: Department of Microbiology, College of Medicine, Yeungnam University, 317-1 Daemyungdong, Namgu, Daegu 705-717, South Korea.
authors.forename: Hye Young
authors.initials: HY
authors.lastname: Kim
authors.affiliation: Department of Microbiology, College of Medicine, Yeungnam University, 317-1 Daemyungdong, Namgu, Daegu 705-717, South Korea.
authors.forename: Hye Ju
authors.initials: HJ
authors.lastname: Cha
authors.affiliation: Department of Microbiology, College of Medicine, Yeungnam University, 317-1 Daemyungdong, Namgu, Daegu 705-717, South Korea. Electronic address: heesun@med.yu.ac.kr.
authors.forename: Hee Sun
authors.initials: HS
authors.lastname: Kim
mesh_terms: D055372:AMP-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D000581:Amidohydrolases / Q000235:genetics / Q000378:metabolism; D000804:Angiotensin II / Q000494:pharmacology; D000818:Animals; D015153:Blotting, Western; D002478:Cells, Cultured; D018946:Chemokine CCL5 / Q000494:pharmacology*; D004789:Enzyme Activation / Q000187:drug effects; D008297:Male; D009131:Muscle, Smooth, Vascular / Q000166:cytology; D032389:Myocytes, Smooth Muscle / Q000187:drug effects* / Q000378:metabolism; D034622:RNA Interference; D011918:Rats, Inbred SHR; D011921:Rats, Inbred WKY; D044139:Receptor, Angiotensin, Type 2 / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015854:Up-Regulation / Q000187:drug effects*
chemical_list: D018946:Chemokine CCL5; D044139:Receptor, Angiotensin, Type 2; D000804:Angiotensin II; D055372:AMP-Activated Protein Kinases; D000581:Amidohydrolases; C059999:dimethylargininase
keywords: AMP-activated protein kinase; Angiotensin II; CCL5; Hypertension; Vascular smooth muscle cells (VSMCs)