目的:探讨凋亡抑制蛋白(inhibitor of apoptosis protein,IAP)家族的新成员Livin及其两种异构体Livinα和Livinβ在非小细胞肺癌(NSCLC)组织中的表达及其与NSCLC临床病理的关系。方法:采用逆转录多聚酶链式反应(RT-PCR)检测NSCLC组织中L...目的:探讨凋亡抑制蛋白(inhibitor of apoptosis protein,IAP)家族的新成员Livin及其两种异构体Livinα和Livinβ在非小细胞肺癌(NSCLC)组织中的表达及其与NSCLC临床病理的关系。方法:采用逆转录多聚酶链式反应(RT-PCR)检测NSCLC组织中Livinα mRNA和LivinβmRNA的表达。结果:58例NSCLC组织中Livin mRNA表达阳性率为74.1%,而在癌旁组织低表达(5.1%,P<0.01)。Livin mRNA表达与患者年龄,病理分型、肿瘤分化程度、淋巴结转移及TNM分期均无明显相关关系。结论:Livin在非小细胞肺癌组织中特异性地高表达,可能与肿瘤的发生、发展密切相关,可能成为诊断和治疗的新靶点。展开更多
Programmed cell death (apoptosis) is a key host response to virus infection. Viruses that can modulate host apoptotic responses are likely to gain important opportunities for transmission. Here we review recent stud...Programmed cell death (apoptosis) is a key host response to virus infection. Viruses that can modulate host apoptotic responses are likely to gain important opportunities for transmission. Here we review recent studies that demonstrate that particles of Invertebrate iridescent virus 6 (IIV-6) (Iridoviridae, genus Iridovirus), or an IIV-6 virion protein extract, are capable of inducing apoptosis in lepidopteran and coleopteran cells, at concentrations 1000-fold lower than that required to shut-off host macromolecular synthesis. Induction of apoptosis depends on endocytosis of one or more heat-sensitive virion component(s). Studies with a JNK inhibitor (SP600125) indicated that the JNK signaling pathway is significantly involved in apoptosis in IIV-6 infections of Choristoneurafumiferana cells. The genome of IIV-6 codes for an inhibitor of apoptosis iap gene (193R) that encodes a protein of 208 aa with 15% identity and 28% similarity in its amino acid sequence to IAP-3 from Cydia pomonella ganulovirus (CpGV). Transcription of IIV-6 iap did not require prior DNA or protein synthesis, indicating that it is an immediate-early class gene. Transient expression and gene knockdown studies have confirmed the functional nature of the IIV-6 lap gene. We present a tentative model for IIV-6 induction and inhibition of apoptosis in insect cells and discuss the potential applications of these findings in insect pest control.展开更多
基金SLB was supported in part by Research Enhancement FundsResearch Development Funds from the Office of the Vice-President for Research, Texas Tech University and the Texas Higher Education Coordin-ating Boardprovided by the Depar-tment of Biological Sciences at Texas Tech University
文摘Programmed cell death (apoptosis) is a key host response to virus infection. Viruses that can modulate host apoptotic responses are likely to gain important opportunities for transmission. Here we review recent studies that demonstrate that particles of Invertebrate iridescent virus 6 (IIV-6) (Iridoviridae, genus Iridovirus), or an IIV-6 virion protein extract, are capable of inducing apoptosis in lepidopteran and coleopteran cells, at concentrations 1000-fold lower than that required to shut-off host macromolecular synthesis. Induction of apoptosis depends on endocytosis of one or more heat-sensitive virion component(s). Studies with a JNK inhibitor (SP600125) indicated that the JNK signaling pathway is significantly involved in apoptosis in IIV-6 infections of Choristoneurafumiferana cells. The genome of IIV-6 codes for an inhibitor of apoptosis iap gene (193R) that encodes a protein of 208 aa with 15% identity and 28% similarity in its amino acid sequence to IAP-3 from Cydia pomonella ganulovirus (CpGV). Transcription of IIV-6 iap did not require prior DNA or protein synthesis, indicating that it is an immediate-early class gene. Transient expression and gene knockdown studies have confirmed the functional nature of the IIV-6 lap gene. We present a tentative model for IIV-6 induction and inhibition of apoptosis in insect cells and discuss the potential applications of these findings in insect pest control.