Journal
BIOCHEMICAL PHARMACOLOGY
Volume 186, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bcp.2021.114489
Keywords
Obesity; Omentin-1; Hypertension; Endothelial dysfunction; Tetrahydroxystilbene glycoside; Oxidative; nitrative stress
Categories
Funding
- National Natural Science Foundation of China [81670449, 81870280, 32071107]
- National Key Research and Development Project [2019YFF0301603]
- Science and Technology Innovation Project of Shaanxi [S2018-ZC-GCZXXY-SF-0005, 2015SF2-08-01, 2020SF-209]
- Key Research Laboratory of Traditional Chinese Medicine and Natural Medicine in Shaanxi [2015164]
- Young Talent Fund of University Association for Science and Technology in Shaanxi, China [20180302]
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This study demonstrated that TSG could improve endothelial function and reduce obesity-related hypertension by increasing omentin-1 levels, activating Akt/eNOS signaling pathway, and attenuating oxidative/nitrative stress. The down-regulation of omentin-1 is associated with endothelial dysfunction and hypertension in obesity, highlighting the potential of TSG as an antihypertensive agent for cardiovascular protection in obesity.
Rationale: Hypertension in obesity has become a major threat for public health. Omentin-1, a novel adipokine, is down-regulated in obesity. Tetrahydroxystilbene glycoside (TSG) is the main ingredient extracted from Polygonum multiflorum Thunb (PMT), a traditional Chinese medicinal herb safely used for protecting cardiovascular systems over bimillennium. This study aims to examine (i) the impact of omentin-1 downregulation on obesityrelated hypertension in murine models and the underlying mechanisms; (ii) whether tetrahydroxystilbene glycoside (TSG) improved endothelial dysfunction and obesity-associated hypertension via the increase of omentin-1. Methods: (TSG-treated) male Zucker diabetic fatty (ZDF) rats and omentin-1 knockout (OMT-/-) mice were used. In vitro, human umbilical vein endothelial cells (HUVECs) and mature adipocytes differentiated from human visceral preadipocyte (HPA-v) were maintained in a co-culture system. Results: TSG was the main active component of PMT reducing systolic blood pressure and improving endothelial vasodilation. Fortnight-TSG treatment (100 mg/kg/day) increased serum omentin-1 level, also activated Akt/ eNOS signaling and enhanced NO bioactivity; decreased expression of NOX2 and p22phox, suppressed production of superoxide and peroxynitrite anion. OMT-/- mice showed elevated blood pressure and impaired endothelial vasorelaxation, whereas hypotensive effect of TSG was blunted. In co-culture system, TSG incubation promoted binding of peroxisome proliferator-activated receptor-? (PPAR-?) and Itln-1 promoter in adipocytes, activated Akt/eNOS/NO signaling and attenuated oxidative/nitrative stress in HUVECs. Suppression of Itln-1 with siRNA significantly blocked the protective effect of TSG in vitro. Conclusions: Down-regulation of omentin-1 induces endothelial dysfunction and hypertension in obesity. TSG treatment (at least partially) increases omentin-1 via promoting binding of PPAR-? and Itln-1 promoter in adipose tissues, subsequently exerts protective effects on endothelial function via activating Akt/eNOS/NO signaling and attenuating oxidative/nitrative stress. These results suggest that TSG could be developed as a promising antihypertension agent that protects against endothelial dysfunction and obesity-associated cardiovascular diseases.
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