血小板膜糖蛋白与凋亡相关联的分析-analysis of association between platelet membrane glycoproteins and apoptosis.docxVIP
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血小板膜糖蛋白与凋亡相关联的分析-analysis of association between platelet membrane glycoproteins and apoptosis
血小板膜糖蛋白与凋亡相关联的研究中文摘要血小板凋亡是近年来人们研究的热点,凋亡是体内血小板维持自身平衡的一种 途径。研究发现许多物理和化学因素都会引起血小板的凋亡,表现为:线粒体跨 膜电位(ΔΨm)的去极化、磷脂酰丝氨酸(PS)的暴露、B 细胞淋巴瘤/白血病-2(Bcl-2)家族蛋白的表达、半胱氨酸天冬氨酸酶(caspase)家族的表达、血小板 形态变化与微颗粒(MP)的释放、细胞骨架蛋白的裂解等。关于引起血小板凋亡 的因素与指标人们了解颇多,但对于血小板膜糖蛋白是否参与血小板凋亡并如何 介导该过程的研究则相知较少,血小板膜表面有丰富的膜糖蛋白或受体,如 GPⅠb-Ⅸ-Ⅴ复合物、GPⅡb/Ⅲa、PAR1 受体、ADP 受体、P-选择素等,并非所有 蛋白或受体都参与血小板凋亡过程。本实验研究发现抗血小板膜表面 GPIbα 单克 隆抗体,SZ-2、AN51 抗体能够作为一种微弱的刺激,通过结合血小板膜 GPIbα, 时间依赖性的诱导 ΔΨm 去极化、bak 和 bad 表达量增加、bcl-xl、bcl-2 和 caspase32kd 表达量减少最终导致血小板凋亡,为在研究血小板减少症的机制及治疗方面提供 一定理论依据。关键词:血小板,凋亡,膜糖蛋白,受体、抗血小板抗体The Research Progress of Platelet Membrane Glycoprotein Associated with ApoptosisAbstractPlatelet apoptosis is the focus of study in recent years, which can be induced by multiple physical and chemical stimuli with markers of apoptosis, that include depolarization of mitochondrial inner membrane, exposure of phosphatidylserine, expression of pro-apoptotic and anti-apoptotic proteins of Bcl-2 family, activation of apoptosis executioner caspase-3, platelet shrinkage, fragmentation to microparticles. While there’s relatively fewer studies in the relationship between platelet membrane glycoprotein and platelet apoptosis. Platelets are full of abundant membraneglycoprotein or receptors , such as GPIb-IX-V complex、GPIIb/IIIa、PAR1 receptor、ADP/ATP receptor、P- selectin etc, and not all of the proteins or receptors are involved in the platelet apoptosis. In this experiment, a new kind of murine anti-glyprotein (GPIb) monoclonal antibodies, SZ-2 、AN51 time-dependent induce ΔΨm depolarization, andincrease the expression of bak and bad, decrease the expression of bcl-xl and bcl-2, which provide a theoretical basis for studying the mechanism and treatment of thrombocytopenia.Key words:platelet,apoptosis,platelet membrane glycoprotein,receptors,anti-platelet antibodies引 言细胞凋亡,又称为“程序性的细胞死亡(programmed cell death,PCD)”,是 机体为维持内环境的稳定,由基因控制的细胞自主的有序的死亡,通过凋亡方式 清除破坏的或“不想要”的细胞。自 1972 年 Kerr[1]等三位科学家首次发现凋亡现 象以来,凋亡一直是人们研究的热点,但研究方向主要集中在有核细胞,随后经 过 20 多年的研究
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