Key result
PGG reduces vascular inflammation and ROS production while improving vascular function in hypertensive mice.
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Background and Purpose Hypertension is a multifactorial disease, manifested by vascular dysfunction, increased superoxide production, and perivascular inflammation. In this study, we have hypothesized that 1,2,3,4,6‐penta‐ O ‐galloyl‐β‐ d ‐glucose (PGG) would inhibit vascular inflammation and protect from vascular dysfunction in an experimental model of hypertension. Experimental Approach PGG was administered to mice every 2 days at a dose of 10 mg·kg −1 i.p during 14 days of Ang II infusion. It was used at a final concentration of 20 μM for in vitro studies in cultured cells. Key Results Ang II administration increased leukocyte and T‐cell content in perivascular adipose tissue (pVAT), and administration of PGG significantly decreased total leukocyte and T‐cell infiltration in pVAT. This effect was observed in relation to all T‐cell subsets. PGG also decreased the content of T‐cells bearing CD25, CCR5, and CD44 receptors and the expression of both monocyte chemoattractant protein 1 (CCL2) in aorta and RANTES (CCL5) in pVAT. PGG administration decreased the content of TNF + and IFN‐γ + CD8 T‐cells and IL‐17A + CD4 + and CD3 + CD4 − CD8 − cells. Importantly, these effects of PGG were associated with improved vascular function and decreased ROS production in the aortas of Ang II‐infused animals independently of the BP increase. Mechanistically, PGG (20 μM) directly inhibited CD25 and CCR5 expression in cultured T‐cells. It also decreased the content of IFN‐γ + CD8 + and CD3 + CD4 − CD8 − cells and IL‐17A + CD3 + CD4 − CD8 − cells. Conclusion and Implication PGG may constitute an interesting immunomodulating strategy in the regulation of vascular dysfunction and hypertension. Linked Articles This article is part of a themed section on Immune Targets in Hypertension. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v176.12/issuetoc
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Mikołajczyk et al. (2019) studied Angiotensin II-induced hypertension. 1,2,3,4,6-Penta-O-galloyl-beta-D-glucose (PGG) vs. Angiotensin II infusion without PGG was evaluated on Perivascular adipose tissue leukocyte and T-cell infiltration, vascular function, and aortic ROS production. PGG decreased perivascular T-cell infiltration and ROS production while improving vascular function in Ang II-infused mice independently of blood pressure.
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