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低氧诱导因子-1的结构、功能、调节及其与低氧信号转导的关系 总被引:1,自引:0,他引:1
在许多类型细胞均发现低氧可诱导低氧诱导因子-1(HIF-1)水平的 增高,说明存在一个普遍的氧感受和低氧信号转导机制,其中HIF-1起着重要的作用。本文 综述了HIF-1的结构、功能和活性调节及其与低氧信号转导的关系等方面的研究进展。 相似文献
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缺氧诱导因子1研究进展 总被引:3,自引:0,他引:3
吴晓兰 《国外医学:分子生物学分册》2000,22(4):202-206
缺氧诱导因子1(HIF-1)在缺氧诱导的哺乳动物细胞中广泛表达,为缺氧应答的全局性调控因子。HIF-1由HIF-1α和HIF-1β两亚基组成,为异源二聚体转录因子。HIF-1α的bHLH和PAS结构域与二聚化及DNA结合活性有关,TAD结构域则主要参与转录激 活。HIF-1α的全长基因已克隆并在人和小鼠中定位。通过作用于靶基因的缺氧反应元件(HRE0,HIF-1参与缺氧诱导的一系列基因的表达调控。 相似文献
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目的:探讨针对缺氧诱导因子-1α(HIF-1α)的小干扰RNA(siRNA)对口腔鳞癌细胞(OSCC)化疗敏感性的影响。方法:用Western印迹检测OSCC和针对HIF-1α基因的siRNA导入OSCC后的HIF-1α蛋白表达水平;用MTT法检测细胞对化疗敏感性的影响;用流式细胞术检测化疗诱导细胞凋亡的凋亡率。结果:HIF-1α在OSCC中高表达,HIF-1α-siRNA转染后HIF-1α表达水平明显下降,细胞对化疗敏感性明显提高,化疗诱导肿瘤细胞凋亡率明显增加。结论:针对HIF-1α基因的siRNA能明显降低HIF-1α的表达,增强化疗对OSCC的凋亡诱导作用,有效提高OSCC对化疗的敏感性。 相似文献
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低氧预处理对大鼠海巴神经元缺氧耐受性和IL—1β表达 … 总被引:3,自引:0,他引:3
目的:观察低氧预处理对大鼠海巴神经元缺氧耐受性和白细胞介素-1β(IL-1β)表达的影响。方法:取培养12d的两组(对照组和低氧预处理组)培养神经元,同时置于缺氧环境(0.9L/LN2,0.1L/LCO2)中培养2、4、8和12h。分别观察它们的形态变化和神经元存活数,并用抗rhIL-1β单克隆抗体进行免疫组织化学染色,观察缺氧对大鼠海马培养神经元IL-1β表达的影响。结果:经低氧预处理的海马神经 相似文献
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缺氧诱导因子1和红细胞生成素3‘—增强子调节内皮细胞?… 总被引:22,自引:0,他引:22
目的和方法:将红细胞生成素(EPO)3'-增强子野生片断及点突变片断借脂质体主人脐静脉内皮细胞株ECV-304,用半定量RT-PCR测定正常秘缺氧诱导因子-1(HIF-1)诱导剂氧化钴(CoCl2)作用下培养6h的细胞环氧合酶2(COX-2)和血栓素合酶(TXS)的mRNA。结果:HIF-1诱导剂CoCl2可放COX-2和TXS基因转明显增强2,向细胞导入野生EPO3'增强子片断可阻断CoCl2诱 相似文献
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第二信使介导模拟低氧下丘脑CRF分泌 总被引:4,自引:0,他引:4
用模拟高原低氧的方法研究急性低氧条件下促肾上腺皮质激素释放因子(corticotropin-releasingfactor,CRF)分泌的变化及第二信使参与CRF分泌的作用。低氧(海拔7km)1h后,正中隆起(medianeminence,ME)处CRF含量明显下降(P<0.05),下丘脑(hypothalamus,Hy)CRF(不含ME)含量无明显变化,而Hy内cAMP含量明显增加(P<0.01)。脑室注射Forsklin、TPA后低氧暴露(海拔5km)1h,MECRF含量下降(P<0.05;P<0.05),HyCRF无明显变化。脑室注射Forsklin后HycAMP含量升高(P<0.05)。脑室注射H7和PKA抑制剂,MECRF升高(P<0.05;P<0.01),HyCRF和HycAMP均无显著变化。上述结果表明急性低氧应激中CRF分泌显著增加,第二信使通路PKA和PKC通路均参与CRF分泌 相似文献
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缺氧诱导因子1研究进展 总被引:1,自引:0,他引:1
胡瑞成 《国外医学:分子生物学分册》2000,22(6):367-370
缺氧诱导因子1(hypoxia-inducible factor-1,HIF-1)是由两个蛋白质亚基组成的二聚体转录因子,对缺氧具有特异感受性,它的表达受细胞内氧分压的严密调节。HIF-1参与体内许多缺氧反应性基因的转录调节,是机体缺氧应答反应中的关键作用因子。 相似文献
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Although the importance of the endosperm as a food store inmany angiosperm seeds is well known, its significance duringearly embryogenesis has been neglected. In many interspecifichybrids, and in some other situations, embryos do not developfully and abort. It has often been stated that this is causedby the endosperm failing to conduct sufficient nutrients tothe embryo, but seldom has it been suggested that the endospermactively controls most of the early stages of morphogenesisof the embryo. Information gleaned from a broad survey of theliterature, combined with additional evidence presented here,obtained fromSolanum incanumand interspecific hybrids, indicatethat the endosperm is dynamic and very active in regulatingearly embryo development. This requires highly integrated geneticcontrol of rapidly changing metabolism in the endosperm. Ininterspecific hybrids, lack of coordination may cause unbalancedproduction of growth regulating substances by the endospermand hence abortion of the embryo, or even unregulated productionof nucleases and proteases resulting firstly in autolysis ofthe endosperm and then digestion of the embryo. The endospermmay thus serve to detect inappropriate hybridization of speciesor ploidy levels and so prevent waste of resources by producingseeds that would result in sterile hybrids or unthrifty subsequentgenerations. This discriminatory function of the endosperm hasdiminished during evolution and domestication of the crop plantSolanummelongenaL.Copyright 1998 Annals of Botany Company Solanum, embryo morphogenesis, endosperm, hybrid, seed development. 相似文献
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Höpfl G Ogunshola O Gassmann M 《American journal of physiology. Regulatory, integrative and comparative physiology》2004,286(4):R608-R623
For most organisms oxygen is essential fo life. When oxygen levels drop below those required to maintain the minimum physiological oxygen requirement of an organism or tissue it is termed hypoxia. To counter act possible deleterious effects of such a state, an immediate molecular response is initiated causing adaptation responses aimed at cell survival. This response is mediated by the hypoxia-inducible factor-1 (HIF-1), which is a heterodimer consisting of an alpha- and a beta-subunit. HIF-1 alpha protein is stabilized under hypoxic conditions and therefore confers selectivity to this response. Hypoxia is characteristic of tumors, mainly because of impaired blood supply resulting from abnormal growth. Over the past few years enormous progress has been made in the attempt to understand how the activation of the physiological response to hypoxia influences neoplastic growth. In this review some aspects of HIF-1 pathway activation in tumors and the consequences for pathophysiology and treatment of neoplasia are discussed. 相似文献
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Michele Rivkin-Flsh 《Medical anthropology quarterly》2000,14(1):119-120
Pragmatic Women and Body Politics. Margaret Lock and Patricia A. Kaufert. eds. Cambridge, UK: Cambridge University Press, 1998. xii +364 pp.
Maternities and Modernities: Colonial and Postcolonial Experiences in Asia and the Pacific. Kalpana Ram and Margaret Jolly. eds. Cambridge, UK: Cambridge University Press, 1998. xiv. 305 pp. 相似文献
Maternities and Modernities: Colonial and Postcolonial Experiences in Asia and the Pacific. Kalpana Ram and Margaret Jolly. eds. Cambridge, UK: Cambridge University Press, 1998. xiv. 305 pp. 相似文献
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Studies of human constitution and mental features are traditionally among the main concepts of anthropological research. In
this research, we attempted to discover connections between morphological and constitutional features and self-esteem in children
and adolescents. Such a connection was discovered in some studied age groups. The obtained results could serve as a basis
for further studies in this field. 相似文献