目的:通过研究恶性胶质瘤细胞中死亡诱导信号复合体(DISC)与肿瘤坏死因子相关凋亡诱导配体(TRAIL)诱导凋亡的关系,初步探讨TRAIL诱导凋亡抵抗的机制。方法:分离恶性胶质瘤组织,获得和培养原代胶质瘤细胞,用100μg.L-1 TRAIL作用后采用...目的:通过研究恶性胶质瘤细胞中死亡诱导信号复合体(DISC)与肿瘤坏死因子相关凋亡诱导配体(TRAIL)诱导凋亡的关系,初步探讨TRAIL诱导凋亡抵抗的机制。方法:分离恶性胶质瘤组织,获得和培养原代胶质瘤细胞,用100μg.L-1 TRAIL作用后采用酸性磷酸酶法检测细胞凋亡水平;Western blotting法检测细胞表达死亡诱导信号复合体的水平。结果:获得3株(GC417、GC321、GC125)原代恶性胶质瘤细胞;3株细胞对TRAIL诱导凋亡的敏感程度不同[GC321(0.12±0.01 vs 0.51±0.02)和GC125(0.22±0.01 vs 0.36±0.01)],对TRAIL诱导凋亡作用敏感,与对照组比较差异有统计学意义(P<0.01);而GC417(0.24±0.01 vs 0.23±0.02)对TRAIL诱导凋亡不敏感。Western blotting法检测结果显示,死亡诱导信号复合体表达不同,GC321和GC125表达增高,GC417表达减少。结论:不同来源的原代培养恶性胶质瘤细胞对TRAIL诱导凋亡的反应不同,死亡诱导信号复合体表达也不同,死亡诱导信号复合体表达的减少可能与凋亡抵抗的发生密切相关。展开更多
Fas相关死亡功能域蛋白(Fas-associated death domain protein,FADD)是Fas/F asL系统信号转导通路中介导细胞凋亡的胞浆死亡信号蛋白。近年来对牛FADD研究逐渐深入,已成功克隆出牛FADD基因,并构建pAcGF-N1-bFADD融合蛋白表达载体等。通...Fas相关死亡功能域蛋白(Fas-associated death domain protein,FADD)是Fas/F asL系统信号转导通路中介导细胞凋亡的胞浆死亡信号蛋白。近年来对牛FADD研究逐渐深入,已成功克隆出牛FADD基因,并构建pAcGF-N1-bFADD融合蛋白表达载体等。通过对小鼠等模式生物的研究发现,FADD在细胞质内能以磷酸化形式存在并参与细胞增殖和有丝分裂等过程。除此之外,FADD蛋白在细胞周期进程、胚胎发育、炎症反应、肿瘤发生等生物学活动中具有一定作用。本文将从FADD基因分析、蛋白修饰及生物学功能入手,揭示FADD作为多功能蛋白对细胞增殖与凋亡平衡起到重要作用,是机体维持正常发育和活动的关键蛋白。为肉牛在育种和实践应用中,提高肉质和胴体性状提供候选基因。展开更多
It has been almost three decades since the term ＂apoptosis＂ was first coined to describe a unique form of cell death that involves orderly, gene-dependent cell disintegration. It is now well accepted that apoptosis ...It has been almost three decades since the term ＂apoptosis＂ was first coined to describe a unique form of cell death that involves orderly, gene-dependent cell disintegration. It is now well accepted that apoptosis is an essential life process for metazoan animals and is critical for the formation and function of tissues and organs. In the adult mammalian body, apoptosis is especially important for proper functioning of the immune system. In recent years, along with the rapid advancement of molecular and cellular biology, great progress has been made in understanding the mechanisms leading to apoptosis. It is generally accepted that there are two major pathways ofapoptotic cell death induction： extrin- sic signaling through death receptors that leads to the formation of the death-inducing signaling complex （DISC）, and intrinsic signaling mainly through mitochondria which leads to the formation of the apoptosome. Formation of the DISC or apoptosome, respectively, activates initiator and common effector caspases that execute the apoptosis process. In the immune system, both pathways operate; however, it is not known whether they are sufficient to maintain lymphocyte homeostasis. Recently, new apoptotic mechanisms including caspase-independent pathways and granzyme-initiated pathways have been shown to exist in lymphocytes. This review will summarize our understanding of the mechanisms that control the homeostasis of various lymphocyte populations.展开更多
文摘目的:通过研究恶性胶质瘤细胞中死亡诱导信号复合体(DISC)与肿瘤坏死因子相关凋亡诱导配体(TRAIL)诱导凋亡的关系,初步探讨TRAIL诱导凋亡抵抗的机制。方法:分离恶性胶质瘤组织,获得和培养原代胶质瘤细胞,用100μg.L-1 TRAIL作用后采用酸性磷酸酶法检测细胞凋亡水平;Western blotting法检测细胞表达死亡诱导信号复合体的水平。结果:获得3株(GC417、GC321、GC125)原代恶性胶质瘤细胞;3株细胞对TRAIL诱导凋亡的敏感程度不同[GC321(0.12±0.01 vs 0.51±0.02)和GC125(0.22±0.01 vs 0.36±0.01)],对TRAIL诱导凋亡作用敏感,与对照组比较差异有统计学意义(P<0.01);而GC417(0.24±0.01 vs 0.23±0.02)对TRAIL诱导凋亡不敏感。Western blotting法检测结果显示,死亡诱导信号复合体表达不同,GC321和GC125表达增高,GC417表达减少。结论:不同来源的原代培养恶性胶质瘤细胞对TRAIL诱导凋亡的反应不同,死亡诱导信号复合体表达也不同,死亡诱导信号复合体表达的减少可能与凋亡抵抗的发生密切相关。
文摘Fas相关死亡功能域蛋白(Fas-associated death domain protein,FADD)是Fas/F asL系统信号转导通路中介导细胞凋亡的胞浆死亡信号蛋白。近年来对牛FADD研究逐渐深入,已成功克隆出牛FADD基因,并构建pAcGF-N1-bFADD融合蛋白表达载体等。通过对小鼠等模式生物的研究发现,FADD在细胞质内能以磷酸化形式存在并参与细胞增殖和有丝分裂等过程。除此之外,FADD蛋白在细胞周期进程、胚胎发育、炎症反应、肿瘤发生等生物学活动中具有一定作用。本文将从FADD基因分析、蛋白修饰及生物学功能入手,揭示FADD作为多功能蛋白对细胞增殖与凋亡平衡起到重要作用,是机体维持正常发育和活动的关键蛋白。为肉牛在育种和实践应用中,提高肉质和胴体性状提供候选基因。
文摘It has been almost three decades since the term ＂apoptosis＂ was first coined to describe a unique form of cell death that involves orderly, gene-dependent cell disintegration. It is now well accepted that apoptosis is an essential life process for metazoan animals and is critical for the formation and function of tissues and organs. In the adult mammalian body, apoptosis is especially important for proper functioning of the immune system. In recent years, along with the rapid advancement of molecular and cellular biology, great progress has been made in understanding the mechanisms leading to apoptosis. It is generally accepted that there are two major pathways ofapoptotic cell death induction： extrin- sic signaling through death receptors that leads to the formation of the death-inducing signaling complex （DISC）, and intrinsic signaling mainly through mitochondria which leads to the formation of the apoptosome. Formation of the DISC or apoptosome, respectively, activates initiator and common effector caspases that execute the apoptosis process. In the immune system, both pathways operate; however, it is not known whether they are sufficient to maintain lymphocyte homeostasis. Recently, new apoptotic mechanisms including caspase-independent pathways and granzyme-initiated pathways have been shown to exist in lymphocytes. This review will summarize our understanding of the mechanisms that control the homeostasis of various lymphocyte populations.
