Erythropoietin induces glycosylphosphatidylinositol hydrolysis. Possible involvement of phospholipase c-gamma(2) |
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Authors: | Boudot C Petitfrère E Kadri Z Chretien S Mayeux P Haye B Billat C |
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Institution: | Laboratoire de Biochimie, CNRS UPRES-A 6021, IFR 53 Biomolécules, UFR Sciences Exactes et Naturelles, BP 1039, Université de Reims Champagne-Ardenne, F 51687 Reims Cedex 2, France. |
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Abstract: | We showed that erythropoietin induced rapid glycosylphosphatidylinositol (GPI) hydrolysis and tyrosine phosphorylation of phospholipase C (PLC)-gamma(2) in FDC-P1 cells transfected with the wild-type erythropoietin-receptor. Erythropoietin-induced tyrosine phosphorylation of PLC-gamma(2) was time- and dose-dependent. By using FDC-P1 cells transfected with an erythropoietin receptor devoid of tyrosine residues, we showed that both effects required the tyrosine residues of intracellular domain on the erythropoietin receptor. Erythropoietin-activated PLC-gamma(2) hydrolyzed purified (3)H]GPI indicating that GPI hydrolysis and PLC-gamma(2) activation under erythropoietin stimulation were correlated. Results obtained on FDC-P1 cells transfected with erythropoietin receptor mutated on tyrosine residues suggest that tyrosines 343, 401, 464, and/or 479 are involved in erythropoietin-induced GPI hydrolysis and tyrosine phosphorylation of PLC-gamma(2), whereas tyrosines 429 and/or 431 seem to be involved in an inhibition of both effects. Thus, our results suggest that erythropoietin regulates GPI hydrolysis via tyrosine phosphorylation of its receptor and PLC-gamma(2) activation. |
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