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Lipid products of phosphoinositide 3-kinase and phosphatidylinositol 4',5'-bisphosphate are both required for ADP-dependent platelet spreading.
J Biol Chem. 1998 Jul 10; 273(28):17817-23.JB

Abstract

We have shown previously that ADP released upon platelet adhesion mediated by alphaIIb beta3 integrin triggers accumulation of phosphatidylinositol 3',4'-bisphosphate (PtdIns-3,4-P2) (Gironcel, D. , Racaud-Sultan, C., Payrastre, B., Haricot, M., Borchert, G., Kieffer, N., Breton, M., and Chap, H. (1996) FEBS Lett. 389, 253-256). ADP has also been involved in platelet spreading. Therefore, in order to study a possible role of phosphoinositide 3-kinase in platelet morphological changes following adhesion, human platelets were pretreated with specific phosphoinositide 3-kinase inhibitors LY294002 and wortmannin. Under conditions where PtdIns-3, 4-P2 synthesis was totally inhibited (25 microM LY294002 or 100 nM wortmannin), platelets adhered to the fibrinogen matrix, extended pseudopodia, but did not spread. Moreover, addition of ADP to the medium did not reverse the inhibitory effects of phosphoinositide 3-kinase inhibitors on platelet spreading. Although synthetic dipalmitoyl PtdIns-3,4-P2 and dipalmitoyl phosphatidylinositol 3',4', 5'-trisphosphate restored only partially platelet spreading, phosphatidylinositol 4',5'-bisphosphate (PtdIns-4,5-P2) was able to trigger full spreading of wortmannin-treated adherent platelets. Following 32P labeling of intact platelets, the recovery of [32P]PtdIns-4,5-P2 in anti-talin immunoprecipitates from adherent platelets was found to be decreased upon treatment by wortmannin. These results suggest that the lipid products of phosphoinositide 3-kinase are required but not sufficient for ADP-induced spreading of adherent platelets and that PtdIns-4,5-P2 could be a downstream messenger of this signaling pathway.

Authors+Show Affiliations

Institut Fédératif de Recherche en Immunologie Cellulaire et Moléculaire, INSERM, Unité 326, Hôpital Purpan, F 31059 Toulouse Cedex, France. recaud@purpan.inserm.frNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9651384

Citation

Heraud, J M., et al. "Lipid Products of Phosphoinositide 3-kinase and Phosphatidylinositol 4',5'-bisphosphate Are Both Required for ADP-dependent Platelet Spreading." The Journal of Biological Chemistry, vol. 273, no. 28, 1998, pp. 17817-23.
Heraud JM, Racaud-Sultan C, Gironcel D, et al. Lipid products of phosphoinositide 3-kinase and phosphatidylinositol 4',5'-bisphosphate are both required for ADP-dependent platelet spreading. J Biol Chem. 1998;273(28):17817-23.
Heraud, J. M., Racaud-Sultan, C., Gironcel, D., Albigès-Rizo, C., Giacomini, T., Roques, S., Martel, V., Breton-Douillon, M., Perret, B., & Chap, H. (1998). Lipid products of phosphoinositide 3-kinase and phosphatidylinositol 4',5'-bisphosphate are both required for ADP-dependent platelet spreading. The Journal of Biological Chemistry, 273(28), 17817-23.
Heraud JM, et al. Lipid Products of Phosphoinositide 3-kinase and Phosphatidylinositol 4',5'-bisphosphate Are Both Required for ADP-dependent Platelet Spreading. J Biol Chem. 1998 Jul 10;273(28):17817-23. PubMed PMID: 9651384.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Lipid products of phosphoinositide 3-kinase and phosphatidylinositol 4',5'-bisphosphate are both required for ADP-dependent platelet spreading. AU - Heraud,J M, AU - Racaud-Sultan,C, AU - Gironcel,D, AU - Albigès-Rizo,C, AU - Giacomini,T, AU - Roques,S, AU - Martel,V, AU - Breton-Douillon,M, AU - Perret,B, AU - Chap,H, PY - 1998/7/4/pubmed PY - 1998/7/4/medline PY - 1998/7/4/entrez SP - 17817 EP - 23 JF - The Journal of biological chemistry JO - J Biol Chem VL - 273 IS - 28 N2 - We have shown previously that ADP released upon platelet adhesion mediated by alphaIIb beta3 integrin triggers accumulation of phosphatidylinositol 3',4'-bisphosphate (PtdIns-3,4-P2) (Gironcel, D. , Racaud-Sultan, C., Payrastre, B., Haricot, M., Borchert, G., Kieffer, N., Breton, M., and Chap, H. (1996) FEBS Lett. 389, 253-256). ADP has also been involved in platelet spreading. Therefore, in order to study a possible role of phosphoinositide 3-kinase in platelet morphological changes following adhesion, human platelets were pretreated with specific phosphoinositide 3-kinase inhibitors LY294002 and wortmannin. Under conditions where PtdIns-3, 4-P2 synthesis was totally inhibited (25 microM LY294002 or 100 nM wortmannin), platelets adhered to the fibrinogen matrix, extended pseudopodia, but did not spread. Moreover, addition of ADP to the medium did not reverse the inhibitory effects of phosphoinositide 3-kinase inhibitors on platelet spreading. Although synthetic dipalmitoyl PtdIns-3,4-P2 and dipalmitoyl phosphatidylinositol 3',4', 5'-trisphosphate restored only partially platelet spreading, phosphatidylinositol 4',5'-bisphosphate (PtdIns-4,5-P2) was able to trigger full spreading of wortmannin-treated adherent platelets. Following 32P labeling of intact platelets, the recovery of [32P]PtdIns-4,5-P2 in anti-talin immunoprecipitates from adherent platelets was found to be decreased upon treatment by wortmannin. These results suggest that the lipid products of phosphoinositide 3-kinase are required but not sufficient for ADP-induced spreading of adherent platelets and that PtdIns-4,5-P2 could be a downstream messenger of this signaling pathway. SN - 0021-9258 UR - https://www.unboundmedicine.com/medline/citation/9651384/Lipid_products_of_phosphoinositide_3_kinase_and_phosphatidylinositol_4'5'_bisphosphate_are_both_required_for_ADP_dependent_platelet_spreading_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0021-9258(18)80560-9 DB - PRIME DP - Unbound Medicine ER -