ArticleHypertension (Dallas, Tex. : 1979)2026
Angiotensin-(1-7) Activates Proopiomelanocortin Neurons in the Arcuate Nucleus.
Article in Hypertension (Dallas, Tex. : 1979), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundAngiotensin-(1-7) lowers blood pressure and improves metabolic outcomes in animal models of obesity and hypertension. Whether central mechanisms are involved in these protective cardiometabolic effects is poorly understood. In this study, we hypothesized that angiotensin-(1-7) engages central neurocircuits originating in the arcuate nucleus of the hypothalamus under normal conditions and in diet-induced obesity.
methodsMale mice were placed on a control diet or 60% high-fat diet for 12 weeks. Immunohistochemistry, in situ hybridization, electrophysiology, and physiological approaches were employed to determine whether angiotensin-(1-7) activates arcuate neurocircuits, to characterize the molecular identity of activated arcuate cells, and to assess the functional importance of this neurocircuit in blood pressure regulation.
resultsUnder control diet conditions, systemic angiotensin-(1-7) administration (2 mg/kg, SC) increased the number of c-fos positive cells in the arcuate nucleus. Angiotensin-(1-7)
conclusionsThese findings suggest that angiotensin-(1-7) activates arcuate proopiomelanocortin neurons and engages arcuate-paraventricular inhibitory neurocircuits to lower blood pressure under normal conditions. In obesity, this circuit appears disrupted, which could contribute to the elevated blood pressure in this model.
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