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Am J Physiol Gastrointest Liver Physiol 282: G461-G469, 2002; doi:10.1152/ajpgi.00207.2001
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Vol. 282, Issue 3, G461-G469, March 2002

Animal model for angiotensin II effects in the internal anal sphincter smooth muscle: mechanism of action

Ya-Ping Fan, Rajinder N. Puri, and Satish Rattan

Department of Medicine, Division of Gastroenterology and Hepatology, Jefferson Medical College of Thomas Jefferson University, Philadelphia, Pennsylvania 19107

Effect of ANG II was investigated in in vitro smooth muscle strips and in isolated smooth muscle cells (SMC). Among different species, rat internal and sphincter (IAS) smooth muscle showed significant and reproducible contraction that remained unmodified by different neurohumoral inhibitors. The AT1 antagonist losartan but not AT2 antagonist PD-123319 antagonized ANG II-induced contraction of the IAS smooth muscle and SMC. ANG II-induced contraction of rat IAS smooth muscle and SMC was attenuated by tyrosine kinase inhibitors genistein and tyrphostin, protein kinase C (PKC) inhibitor H-7, Ca2+ channel blocker nicardipine, Rho kinase inhibitor Y-27632 or p44/42 mitogen-activating protein kinase (MAPK44/42) inhibitor PD-98059. Combinations of nicardipine and H-7, Y-27632, and PD-98059 caused further attenuation of the ANG II effects. Western blot analyses revealed the presence of both AT1 and AT2 receptors. We conclude that ANG II causes contraction of rat IAS smooth muscle by the activation of AT1 receptors at the SMC and involves multiple intracellular pathways, influx of Ca2+, and activation of PKC, Rho kinase, and MAPK44/42.

internal anal sphincter; smooth muscle tone; tyrosine kinase; Rho kinase; mitogen-activating protein kinase; protein kinase C; calcium influx


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