PMID: 8945891Nov 1, 1996Paper

Effects of adenosine and protein kinase C stimulation on mechanical properties of rat cardiac myocytes

The American Journal of Physiology
J W LesterP A Hofmann

Abstract

Exposure of the heart to adenosine decreases heart rate and left ventricular developed pressure. However, little is known regarding the influence of adenosine on mechanical properties of isolated ventricular myocytes and the intracellular mechanism(s) by which adenosine acts. Therefore, in the present study we compared the effects of the adenosine receptor agonist R-phenylisopropyladenosine (R-PIA) and protein kinase C (PKC) activator dioctanoylglycerol (DOG) on Ca2+ sensitivity of tension, maximum isometric tension, and velocity of unloaded shortening (Vmax) in enzymatically isolated, drug-treated, and subsequently skinned ventricular myocytes. Neither R-PIA (100 microM) nor DOG (50 microM) affected Ca2+ sensitivity of tension or maximum isometric tension compared with controls. However, both R-PIA and DOG treatment caused approximately 25% decrease in Vmax during maximum activation compared with controls. This suggests adenosine and PKC decrease actin-myosin interaction through an alteration of myofilament proteins. The observed similarity of response after R-PIA and DOG treatment is consistent with the hypothesis that effects of adenosine are mediated by activation of the PKC pathway in isolated ventricular myocytes.

Citations

Oct 23, 2001·American Journal of Physiology. Heart and Circulatory Physiology·T NoguchiM M LeWinter
Jul 26, 2003·American Journal of Physiology. Heart and Circulatory Physiology·Yi ChenPolly Hofmann
May 24, 2005·American Journal of Physiology. Heart and Circulatory Physiology·Ravi RajashreePolly A Hofmann
Aug 19, 2007·The Journal of Pharmacology and Experimental Therapeutics·Polly A HofmannLeonard Lothstein
Sep 29, 2000·American Journal of Physiology. Heart and Circulatory Physiology·W G PyleP A Hofmann
Mar 10, 2000·American Journal of Physiology. Heart and Circulatory Physiology·L LiD M Bers
Mar 15, 2003·American Journal of Physiology. Heart and Circulatory Physiology·Elizabeth M GreyPolly A Hofmann
May 22, 2007·American Journal of Physiology. Heart and Circulatory Physiology·Bradford C BluntPolly A Hofmann
Jun 16, 2009·American Journal of Physiology. Heart and Circulatory Physiology·Richard A FentonJames G Dobson
Sep 3, 2013·American Journal of Physiology. Heart and Circulatory Physiology·Rongzhen ZhangMichael J Davis
Sep 18, 2002·American Journal of Physiology. Heart and Circulatory Physiology·Qinghang Liu, Polly A Hofmann
Nov 22, 2000·American Journal of Physiology. Heart and Circulatory Physiology·J W Lester, P A Hofmann
Mar 22, 2003·American Journal of Physiology. Heart and Circulatory Physiology·Qinghang Liu, Polly A Hofmann
Jul 17, 2001·American Journal of Physiology. Heart and Circulatory Physiology·W G PyleP A Hofmann

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