Selective and competitive antagonism by suramin of ATP-stimulated catecholamine-secretion from PC12 phaeochromocytoma cells

K. Inoue, K. Nakazawa, M. Ohara-Imaizumi, T. Obama, K. Fujimori, A. Takanaka

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

1. Suramin, a putative P2-antagonist, (10 to 300 μM) inhibited the adenosine 5'-triphosphate (ATP)-stimulated secretion of [3H]-noradrenaline or endogenous dopamine from phaeochromocytoma PC12 cells in a concentration-dependent manner. Suramin (300 μM) did not affect the dopamine-secretion stimulated by high K+ or nicotine. 2. Suramin shifted the concentration-response curve for ATP to the right. The antagonism was competitive with a pA2 value of 4.52. 3. ATP also stimulated an increase in intracellular Ca2+ concentration as determined by fura-2 methods. Suramin antagonized this effect over the same concentration range that antagonized the ATP-stimulated catecholamine secretion. 4. These results suggest that suramin can be used as a selective and competitive antagonist of ATP in experiments concerning mechanisms of catecholamine-secretion.

Original languageEnglish
Pages (from-to)581-584
Number of pages4
JournalBritish Journal of Pharmacology
Volume102
Issue number3
DOIs
Publication statusPublished - 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Pharmacology

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