共查询到19条相似文献，搜索用时 109 毫秒
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细胞内寄生虫抑制细胞凋亡的机制 总被引：1，自引：0，他引：1
宿主有效地防御机制使寄生在细胞内的虫体发展了多种调节宿主细胞凋亡的途径。刚第弓形虫、杜氏锥虫、利什曼原虫、泰勒虫等都可抑制宿主细胞的凋亡进程而为自身的复制和寄生生活的持续提供了有利的环境,尽管它们进入细胞的机制和在细胞中的定位不同,但都激活相似的途径而发挥抑制作用。目前已知有2个家族的蛋白分子能够打破凋亡进程,一是寄生虫依赖的核因子κappaB,另一个是寄生虫感染诱导表达的热休克蛋白。其确切的分子机制尚不清楚。 相似文献
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抗感染免疫是动物机体抵抗病原体感染的能力。热休克蛋白70通过激活天然免疫细胞活化等方式参与机体天然免疫．通过调节抗原递呈细胞对抗原的加工与递呈，增强免疫应答和参与免疫球蛋白组装等方式发挥对适应性免疫的影响．进而参与感染与免疫。根据国内外近年来对热休克蛋白70的研究概况．对热休克蛋白70在机体抗感染免疫中的作用进行了综述... 相似文献
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热休克蛋白70是生物体在各种应激条件下产生的蛋白之一,具有维持细胞自身稳定等多种生物学功能,与胚胎的生长发育有着密切的内在联系。目前及今后若干年热休克蛋白70与胚胎生长发育研究领域都将是世界各国生命科学研究的热点,同时也是极有希望的研究领域。文章就热休克蛋白70自身,热休克蛋白70与胚胎畸形发生的关系,以及热环境条件下热休克蛋白70与胚胎生长发育的关系作一综述。 相似文献
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热休克现象是1962年R itossa首先在果蝇幼虫动物试验中发现的。试验发现,果蝇唾液腺染色体在过热环境中会发生形态改变。此现象与细胞中一类特殊蛋白质———热休克蛋白(Heat shock protein,HSP)的合成有关,因其最先在热休克现象中发现而得以命名。热休克蛋白除了因热休克刺激产生以外,还有很多因素(如缺氧、低温、氧化反应、化学物质、各种重金属、放射线、某些线粒体呼吸链抑制剂及某些药物等)都可以诱导产生,因此热休克蛋白又称为应激蛋白质(stress protein)。HSP70和HSP90是分子质量分别在70,90 ku左右的热休克蛋白,是热休克蛋白家… 相似文献
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《蚕业科学》2015,(2)
为证实柞蚕热休克蛋白在柞蚕防御体系中的作用,利用RT-PCR技术在柞蚕5龄幼虫中肠组织克隆了一个热休克蛋白基因Ap HSC70(Gen Bank登录号:KJ437496),并通过实时荧光定量PCR(qRT-PCR)检测该基因在感染柞蚕微孢子虫的柞蚕中肠中的表达变化。该基因的开放阅读框(ORF)长1 959 bp,编码652个氨基酸,预测蛋白质分子质量为71.49 k D,等电点(p I)为5.38,具有细胞质特征基序,推测为一种组成型热休克蛋白;Ap HSC70与斜纹夜蛾、棉铃虫同源蛋白质的序列相似度最高,分别达96.94%、96.33%。感染柞蚕微孢子虫后0~9 h的柞蚕5龄幼虫中肠组织中,Ap HSC70基因转录水平变化不大,但感染后12 h该基因的转录水平开始升高,至感染后21 h达到最高值。研究结果表明,柞蚕中肠组织的Ap HSC70基因在柞蚕微孢子虫入侵时的表达变化呈现出一定的应激响应,表达量最高可上调近5倍,推测该基因可能参与了柞蚕的免疫防御过程。 相似文献
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哺乳动物热休克蛋白70表达的基因调控与生物学功能 总被引：3，自引：0，他引：3
热休克蛋白70(HSP70)是热休克蛋白家族中的重要成员，作为一种细胞内源性保护蛋白，当机体或细胞遭受应激时，它可以通过一定的表达调控机制进行显著增量表达，并在一定范围内发挥其特有的生物学功能来抵御或减缓应激对细胞的损伤。 相似文献
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Heat shock proteins have essential roles in a number of pathophysiologic conditions including carcinogenesis and represent a group of novel molecular markers in cancer management. The aim of this study was to investigate heat shock protein expression in correlation with other neoplasm traits such as: histological type, differentiation grade, proliferative activity, estrogenic receptor expression, and cyclooxygenase-2 and p53 proteins. Material for the investigation comprised 133 tumors of the mammary gland collected from bitches. In total 14 adenomas, 66 complex carcinomas, 47 simple carcinomas and 6 solid carcinomas were collected. Evaluations were conducted with histopathological and immunohistochemical methods using suitable antibodies. Expression of heat shock protein 70 was observed in all types of evaluated neoplasms. A higher average number of cells undergoing expression of heat shock protein 70, which was statistically insignificant, was established in complex and simple cancers and in cancers with the 1st and the 2nd degree of histological malignancy. Expression of heat shock protein 90 was observed in all studied neoplasms; it was very insignificant in adenomas, compared to cancers, and the highest expression was established in the solid cancers, as well as in cancers with the 2nd degree of histological malignancy. This high expression of heat shock protein 90 was correlated with proliferative activity. The results suggest that heat shock protein 90 is involved in canine mammary gland carcinogenesis. The results also suggest that heat shock protein 90 may be a prognostic factor, but this requires detailed clinical confirmation. 相似文献
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本试验旨在研究热激条件下家蚕血液磷酸化蛋白的表达变化,为深入研究其功能提供参考。试验设对照组和热激组,每组选取五龄第3天家蚕幼虫各30头(雌雄各占1/2),在40℃条件下分别热激处理0、10 min,然后利用双向电泳、Pro-Q Diamond染色、质谱技术对表达差异的磷酸化蛋白进行研究。结果表明:1)银染图谱30 ku区积累了大量蛋白,经Pro-Q Diamond染色后发现它们属于磷酸化蛋白。2)经过多次取样和质谱鉴定,最终获得了3个30K蛋白,分别是PBMHPC-6、PBMHPC-19和PBMHPC-12。3)热激处理10 min后,3个30K蛋白的表达量与热激处理0 min相比显著上调(P0.05)。由此得出,五龄家蚕血液富含30K蛋白,它们不仅在脂质运输方面承担着重要的角色,而且很可能参与热激应答。 相似文献
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San-Qiang Li Dong-Mei Wang You-Ju Shu Xue-Dong Wan Zheng-Shun Xu En-Zhong Li 《Journal of toxicologic pathology》2013,26(4):365-373
Whether proper heat shock preconditioning can reduce liver injury and accelerate liver repair after acute liver injury is worth study. So mice received heat shock preconditioning at 40°C for 10 minutes (min), 20 min or 30 min and recovered at room temperature for 8 hours (h) under normal feeding conditions. Then acute liver injury was induced in the heat shock-pretreated mice and unheated control mice by intraperitoneal (i.p.) injection of carbon tetrachloride (CCl4). Hematoxylin and eosin (H&E) staining, serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels and the expression levels of heat shock protein 70 (HSP70), cytochrome P450 1A2 (CYP1A2) and proliferating cell nuclear antigen (PCNA) were detected in the unheated control mice and heat shock-pretreated mice after CCl4 administration. Our results showed that heat shock preconditioning at 40°C for 20 min remarkably improved the mice’s survival rate (P<0.05), lowered the levels of serum AST and ALT (P<0.05), induced HSP70 (P<0.01), CYP1A2 (P<0.01) and PCNA (P<0.05) expression, effectively reduced liver injury (P<0.05) and accelerated the liver repair (P<0.05) compared with heat shock preconditioning at 40°C for 10 min or 30 min in the mice after acute liver injury induced by CCl4 when compared with the control mice. Our results may be helpful in further investigation of heat shock pretreatment as a potential clinical approach to target liver injury 相似文献
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谷氨酰胺对热休克蛋白表达的影响 总被引：2，自引：0，他引：2
谷氨酰胺的研究是生理和营养免疫领域研究的热点之一 ,近年来发现当动物处于应激状态下 ,谷氨酰胺不能满足机体需要 ,添加谷氨酰胺有助于增强机体对应激的抵抗能力。热休克蛋白 (HSP)是动物对外界刺激作出应答反应时产生的多肽类物质 ,起减缓应激不良影响、恢复机体正常机能的作用。鉴于最近几年来谷氨酰胺和热休克蛋白关系的研究 ,本文从体内、外试验研究两方面论述了谷氨酰胺对应激细胞的保护作用 ,以及添加谷氨酰胺与提高HSP表达的关系 ,且对其作用机制作了初步的探讨 相似文献
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In the current studies, flow cytometric methods were used to demonstrate that heat shock protein (hsp) 70 is constitutively expressed in ovine and bovine leukocytes but that the level of expression varies considerably between different leukocyte types and between species. We also show that expression of hsp70 is upregulated in response to an in vitro heat shock treatment. The optimal temperature for heat shock of leukocytes from sheep and cattle is 43.5 degrees C. In sheep and cattle, the relative susceptibility of leukocyte type to upregulation of hsp70 expression, as assayed as percent positive cells, by in vitro heat shock was cell type specific. Best results were obtained from fresh samples; after storage at room temperature for 24h upregulation was highly variable between animals and less than in fresh samples. These studies demonstrate that evaluation of leukocyte hsp70 expression by flow cytometry is a robust, reproducible method for use in the evaluation of cellular stress responses in cattle and sheep. The application of the methods described may be a valuable tool in assessing in vivo stress responses in livestock species. 相似文献
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小热休克蛋白(small heat shock protein,sHSP)是一类受热处理后诱导产生的蛋白家族。从构建的家蚕蛹cDNA文库中获得了一条全长764 bp的基因序列(GenBank登录号:AAG30944.1),其开放阅读框(ORF)长561 bp,编码186个氨基酸。用生物信息学方法对此序列进行同源性分析,表明该序列是一条保守性高达85%的家蚕小热休克蛋白20.8(BmHSP20.8),无跨膜结构,主要分布于细胞质。将该序列的ORF与pET-28a(+)载体连接构建重组质粒,并转化到大肠杆菌BL21进行原核表达,纯化后的融合蛋白免疫新西兰大白兔获得抗血清。通过亚细胞定位技术研究BmHSP20.8在正常和热激状态下的家蚕卵巢上皮细胞Bm5和BmN中的变化,结果显示热激后BmH-SP20.8蛋白从细胞质往细胞膜方向迁移。有BmHSP20.8表达的大肠杆菌菌株经48℃处理后,其生存率比未表达BmHSP20.8蛋白的菌株高4倍左右,说明BmHSP20.8蛋白在大肠杆菌中表达能够提高细菌体在高温环境下的生存率。 相似文献