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. 1992 Aug;106(4):853–858. doi: 10.1111/j.1476-5381.1992.tb14424.x

The nucleotide receptors on mouse C2C12 myotubes.

R H Henning 1, A Nelemans 1, J van den Akker 1, A den Hertog 1
PMCID: PMC1907683  PMID: 1393284

Abstract

1. The response of C2C12 mouse myotubes to stimulation with adenosine triphosphate (ATP) and other nucleotides was studied by measuring changes in membrane potential. 2. A transient hyperpolarization followed by a slowly declining depolarization of the cells was observed in the presence of ATP (10 microM-1 mM). 3. The hyperpolarization was not observed in the absence of external calcium, and was abolished in the presence of tetraethylammonium (20 mM) or the bee toxin, apamin (0.1 microM). The depolarization was reduced under low sodium conditions. 4. A biphasic change in membrane potential was also recorded in the presence of adenosine 5'-O-(3-thiotriphosphate) (ATP gamma S) and the pyrimidine uridine triphosphate (UTP), while the ATP derivatives and analogues, adenosine diphosphate, adenosine, alpha,beta-methylene ATP and 2-methylthio ATP and the nucleotides, guanosine triphosphate and cytidine triphosphate, did not affect the membrane potential of the myotubes. 5. The hyperpolarization elicited by ATP gamma S or UTP was also blocked by apamin and abolished under Ca(2+)-free conditions. 6. In contrast to ATP and ATP gamma S, the depolarization evoked by UTP was unaffected under low Na+ and less sensitive to the antagonistic action of suramin. 7. The ATP and UTP responses at maximal concentration were not additive after simultaneous application. ATP elicited a depolarization if applied after UTP, while UTP did not change membrane potential following the application of ATP. 8. The concentration-response curves of the effective nucleotides were shifted to the right in the presence of suramin, suggesting competitive antagonism.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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