ArticleIranian journal of basic medical sciences2026
Cardiovascular effects of ventrolateral periaqueductal gray (vlPAG) AT1 receptors in normotensive and hemorrhagic rats.
Article in Iranian journal of basic medical sciences, 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
Objectives: The ventrolateral periaqueductal gray (vlPAG) regulates cardiovascular function. Given the presence of Angiotensin II (AngII) and its AT1 receptors (AT1R) in the vlPAG, this study investigated their central and peripheral roles in cardiovascular control during normotensive and hemorrhage (Hem) conditions. Materials and Methods: Saline, three doses of AngII (0.1, 0.2, and 0.3 nmol) were microinjected into the vlPAG. The AT1R blocker Losartan (Losa) was microinjected alone and before AngII in normotensive and Hem conditions. The peripheral mechanisms of AngII were examined by intravenous injection of hexamethonium (Hexa, a ganglion blocker) and atropine (Atro, a muscarinic receptor blocker), alone and before AngII (0.3 nmol), in both normotensive and Hem conditions. Time course and maximal changes (Δ) of mean arterial pressure (MAP), systolic blood pressure (SBP), and heart rate (HR) were recorded by the PowerLab apparatus and analyzed. Results: Higher doses of AngII significantly increased HR, SBP, and MAP ( Conclusion: AngII in the vlPAG stimulates cardiovascular activity via AT1R in both normotensive and Hem conditions. Furthermore, these peripheral effects of AngII are primarily mediated through sympathetic nervous system activation.
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