Title of article :
Effects of hypo-osmotic stress on ATP release in isolated turbot (Scophthalmus maximus) hepatocytes
Author/Authors :
Ollivier، Helene نويسنده , , Pichavant-Rafini، Karine نويسنده , , Puill-Stephan، Eneour نويسنده , , Calves، Patrick نويسنده , , Nonnotte، Liliane نويسنده , , Nonnotte، Guy نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
-426
From page :
427
To page :
0
Abstract :
Background information. ATP is released from many cell types exposed to hypo-osmotic shock and is involved in RVD (regulatory volume decrease). Purinergic signalling events have been extensively investigated in mammals, but not in marine teleosteans. Results. The effect of hypo-osmotic shock on ATP release was examined in isolated hepatocytes from turbot (Scophthalmus maximus), a marine flatfish. Hypo-osmotic stress (240 mOsm.kg^-1) induced a significant increase in ATP efflux, and was inhibited by a potential CFTR (cystic fibrosis transmembrane conductance regulator) inhibitor, glibenclamide, but not by the MDR1 (multidrug resistance 1) Pglycoprotein inhibitor, verapamil. ATP efflux could be a cAMP-dependent process, as IBMX (isobutylmethylxanthine) and forskolin triggered the process under iso-osmotic conditions. Protein kinases, including protein kinase C, could also be involved, as staurosporine and chelerythrine inhibited the mechanism. Calcium could contribute to ATP efflux as ionomycin, a calcium ionophore, elicited a rapid release under iso-osmotic conditions, and chelation using EGTA abolished ATP release under hypo-osmotic conditions. RVD was partially abolished by apyrase, an ATP scavenger, and suramin, a purinoceptor antagonist. Moreover, hypo-osmotic shock induced a rise in intracellular calcium which could be involved in RVD. Since extracellular ATP triggered an increase in cellular freecalcium content under iso-osmotic conditions, our results could indicate that hypo-osmotic-induced ATP efflux contributes to RVD in turbot hepatocytes by stimulating purinergic receptors, which may lead to activation of a calcium signalling pathway. Conclusions. These data provide the first evidence of volume-sensitive ATP signalling for volume maintenance in a marine teleost fish cell type.
Keywords :
Greenhouse , IPM , DIGLYPHUS ISAEA , Biological control , Abamectin compatibility , Liriomyza trifolii
Journal title :
Biology of the Cell
Serial Year :
2006
Journal title :
Biology of the Cell
Record number :
120620
Link To Document :
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