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PKC、PKA和TPK在血小板激活中的作用 被引量:8

The Role of PKC, PKA and TPK on Platelet Aggregation
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摘要 利用^(32)P-NaH_2PO_4标记猪血小板,然后以PMA、凝血酶、PGE_1、腺苷等处理,结果表明,随着PMA激活PKC,血小板发生聚集。35μmol/LPGE_1或1mmol/LdbcAMP不能抑制50nmol/LPMA诱导的血小板聚集,腺苷却能抑制PMA诱导的血小板聚集(EC_(50)=0.1mmol/L),db-cAMP、腺苷都不能抑制100nmol/LPMA诱导的40kD蛋白磷酸化。PKA激活不能抑制PMA激活的PKC。在PMA、凝血酶激活的血小板中,PKC、TPK都发生激活,40kD底物既是PKC的底物又是TPK的底物,PKC和TPK在血小板聚集中起着重要的调节作用。 Suspensions of aspirin-treated, ̄(32)P-prelabeled, washed pig platelets containing ADP scavengers in the buffer were stimulated with PMA, thrombin,PGE_1 and db-cAMP.The phosphorylation of 40 kD, a subtrate of PKC, was increased dose-dependently with concentraction of PMA or thrombin, also, the phosphoryaltion of 26 kD, 38 kD was. Platelet aggregation induced by PMA occurred in parallel with PKC activation. PGE_1, a adenylate cyclase activator, could not inhibit platelet aggregation induced by 50 nmol/L PMA. db-cAMP,adenosine could not inhibit protein phosphorylation evoked by PKC. The result implies that protein kinase A (PKA) could not inhibit protein kinase C(PKC) when it was activated by PMA. In alkali treated PAGE gel, it was found that 40 kD, 57 kD polypeptides were more resistant to alkali than other polypeptides. Phosphoaminoacid analysis of 40 kD and 57 kD polypeptides indicated that it contained phosphoserine, phosphothreonine and phosphotyrosine. The 40 kD polypeptide may be a common substrate of PKC and TPK (tyrosine-protein kinase). The 40 kD polypeptide phosphorylation may play an important role in platelet aggreagation.
出处 《生物化学杂志》 CSCD 1995年第5期584-588,共5页
基金 国家自然科学基金
关键词 血液 血小板聚集 蛋白激酶 酪氨酸蛋白激酶 Platelet aggregation, Protein kinase C, Protein kinase A, Tyrosine protein kinase
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