Angiotensin II acting on brain AT(1) receptors induces adrenaline secretion and pressor responses in the rat

作者：Nakamura Kumiko; Shimizu Takahiro^*; Yanagita Toshihiko; Nemoto Takayuki; Taniuchi Keisuke; Shimizu Shogo; Dimitriadis Fotios; Yawata Toshio; Higashi Youichirou; Ueba Tetsuya; Saito Motoaki

来源：Scientific Reports, 2014, 4(1): 7248.

DOI：10.1038/srep07248

Angiotensin II (AngII) plays important roles in the regulation of cardiovascular function. Both peripheral and central actions of AngII are involved in this regulation, but mechanisms of the latter actions as a neurotransmitter/neuromodulator within the brain are still unclear. Here we show that (1) intracerebroventricularly (i.c.v.) administered AngII in urethane-anesthetized male rats elevates plasma adrenaline derived from the adrenal medulla but not noradrenaline with valsartan- (AT(1) receptor blocker) sensitive brain mechanisms, (2) peripheral AT1 receptors are not involved in the AngII-induced elevation of plasma adrenaline, although AngII induces both noradrenaline and adrenaline secretion from bovine adrenal medulla cells, and (3) i.c.v. administered AngII elevates blood pressure but not heart rate with the valsartan-sensitive mechanisms. From these results, i.c.v. administered AngII acts on brain AT(1) receptors, thereby inducing the secretion of adrenaline and pressor responses. We propose that the central angiotensinergic system can activate central adrenomedullary outflow and modulate blood pressure.

• 出版日期2014-11-28