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. 1988 Jul;401:185–199. doi: 10.1113/jphysiol.1988.sp017157

ATP and other adenine compounds increase mechanical activity and inositol trisphosphate production in rat heart.

A Legssyer 1, J Poggioli 1, D Renard 1, G Vassort 1
PMCID: PMC1191844  PMID: 3262739

Abstract

1. The effects of adenosine 5'-triphosphate (ATP) and other adenine compounds were examined on rat papillary and right ventricular muscles in the presence of 10 microM-propranolol, 10 microM-atropine and 0.1 microM-prazosin or 10 microM-phentolamine. 2. Adenosine, adenosine 5'-monophosphate (AMP), adenosine 5'-diphosphate (ADP), ATP and alpha,beta-methylene ATP (APCPP) produced small positive inotropic effects, sometimes preceded by transient negative effects. 3. 8-Phenyltheophylline (8-PT), a P1-purinoceptor antagonist antagonized the negative effects and increased the positive inotropy induced by ATP and adenosine. 4. In the presence of APCPP, a P2-purinergic agonist, ATP had only negative inotropic effects. 5. Adenosine and ATP increased inositol 1, 4, 5- and inositol 1, 3, 4-trisphosphate as well as inositol mono- and bisphosphate formation. Maximal effects were obtained at concentrations of 0.5 mM. 6. APCPP increased inositol phosphate formation while 8-PT did not prevent the effects of adenosine and ATP. 7. It is suggested that P2-purinoceptor activation induces both a positive inotropy and an increase in inositol-lipid metabolism in rat ventricular muscles.

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Selected References

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