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Reversible and selective antagonism by suramin of ATP‐activated inward current in PC12 phaeochromocytoma cells
Author(s) -
Nakazawa Ken,
Fujimori Kannosuke,
Takanaka Akira,
Inoue Kazuhide
Publication year - 1990
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.1990.tb12117.x
Subject(s) - suramin , adenosine triphosphate , adenosine , chemistry , patch clamp , biophysics , microbiology and biotechnology , medicine , pharmacology , receptor , biology , endocrinology , biochemistry
1 The effects of suramin on an adenosine 5′‐triphosphate (ATP)‐ activated inward current were investigated in PC12 phaeochromocytoma cells with whole‐cell voltage‐clamp techniques. 2 Suramin (30 to 300 μ m ) inhibited the ATP‐activated current in a dose‐dependent manner. The inhibitory effects were reversible and competitive. 3 Suramin also suppressed the current activated by adenosine 5′‐0‐(3‐thio triphosphate) but did not affect the current activated by nicotine. Suramin did not affect the suppression of a K current induced by methacholine. 4 The results suggest that suramin antagonizes the ATP‐receptor‐operated membrane current reversibly and selectively.