Journal
CELLULAR SIGNALLING
Volume 15, Issue 1, Pages 115-121Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S0898-6568(02)00062-1
Keywords
ATP; HeLa; Na+/K+ ATPase
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The role of ATP on regulation of the Na+/K+-ATPase activity in the human cancerous HeLa cells was investigated. HeLa cells stimulated with increasing ATP concentrations showed a dose-dependent inhibition of the Na+/K+-ATPase activity. These effects were also obtained by UTP. ATP and UTP provoked a rise in intracellular calcium concentration ([Ca2+](i)) persisting for at least 4 min. The inhibitor of phospholipase C, U73122, blocked the elevation of [Ca2+](i) provoked by ATP/UTP. The expression of mRNA for P2Y2 and P2Y6 receptors was demonstrated by RTPCR. ATP/UTP activated PKC-alpha, -betaI and -epsilon isoforms, but not PKC-delta and -zeta. The inhibition of the Na+/K+-ATPase activity by ATP/UTP was blocked by Go6976, a specific inhibitor of the calcium-dependent PKCs. In conclusion, our results suggest that ATP/UTP modulate Na+/K+-ATPase activity in HeLa cells through the P2Y2 purinoceptor via calcium mobilisation and activation of calcium-dependent PKCs. (C) 2002 Elsevier Science Inc. All rights reserved.
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