共查询到19条相似文献,搜索用时 78 毫秒
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《细胞与分子免疫学杂志》2015,(10)
营养缺乏的主要细胞反应之一是自噬上调。营养相关信号如细胞内氨基酸、ATP和氧含量等与细胞内合成和分解代谢过程的平衡密切相关。关键营养敏感激酶雷帕霉素靶蛋白复合物1(m TORC1)和单磷酸腺苷依赖蛋白激酶(AMPK)是营养相关自噬的主要信号通路。细胞内的营养情况通过失调51样激酶(ULK)和磷脂酰肌醇3激酶3型催化亚基(VPS34)激酶复合物的协调调节自噬。m TORC1、AMPK、ULK和VPS34之间的广泛交叉和反馈环在自噬诱导和保持细胞稳态中具有重要作用。本文主要描述细胞内营养状态(氨基酸、糖和氧)发生改变时自噬调节的研究进展。 相似文献
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目的:探讨紫檀芪(PTE)对宫颈癌细胞自噬及SIRT1-FoxO信号通路的影响。方法:以人宫颈癌HeLa细胞作为研究对象。采用CCK-8法和流式细胞术分别测定不同浓度的PTE对HeLa细胞活力和凋亡率的影响;透射电镜观察细胞中自噬体数目;qPCR测定细胞中SIRT1和FoxO的mRNA表达;Western blot测定细胞中SIRT1、FoxO、LC3-Ⅰ、LC3-Ⅱ、p62、Bax和Bcl-2水平。结果:PTE作用于HeLa细胞24和48 h后,细胞活力抑制率随浓度增加而升高。与0μmol/L PTE相比,15、30和60μmol/L PTE处理后,HeLa细胞凋亡率、细胞中自噬体数目及Bax、LC3-Ⅱ/LC3-Ⅰ、SIRT1和FoxO水平显著升高(P<0.05),Bcl-2和p62水平显著降低(P<0.05),且呈浓度依赖性。结论:PTE可能通过激活SIRT1-FoxO信号通路诱导HeLa细胞自噬和凋亡,从而抑制HeLa细胞活力。 相似文献
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线粒体自噬是选择性自噬的重要形式之一,可通过调控生物体内线粒体质量影响肺部疾病发生发展。线粒体自噬在不同的肺部疾病中发挥着不同的作用。如在特发性肺纤维化与急性肺损伤中,线粒体自噬水平过高或过低都可加重病情;而在肺动脉高压中,线粒体自噬水平过高时会产生损害效应。除此之外,在慢性阻塞性肺疾病中,线粒体自噬可调节细胞坏死以及控制细胞炎性反应。因此,深入了解线粒体自噬调控机制对肺部疾病的防治具有重要意义。 相似文献
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自噬是细胞适应环境变化、防御病原微生物侵袭、维持内环境稳定的重要机制.在多种人类肿瘤中存在有自噬活性的改变,自噬在肿瘤的发生发展过程中起到了促进和抑制的双重作用.对自噬研究的不断深入,不仅进一步揭示了真核生物自身调控的复杂性和多样性,更为肿瘤的基因治疗及克服肿瘤耐药性提供了新的思路.现将自噬与肿瘤的发生、发展的研究进展做一综述. 相似文献
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In polyglutamine diseases, an abnormally elongated polyglutamine tract results in protein misfolding and accumulation of intracellular aggregates. The length of the polyglutamine expansion correlates with the tendency of the mutant protein to aggregate, as well as with neuronal toxicity and earlier disease onset. Although currently there is no effective cure to prevent or slow down the progression of these neurodegenerative disorders, increasing the clearance of mutant proteins has been proposed as a potential therapeutic approach. The ubiquitin-proteasome system and autophagy are the two main degradative pathways responsible for eliminating misfolded and unnecessary proteins in the cell. We will review some of the studies that have proposed autophagy as a strategy to reduce the accumulation of polyglutamine-expanded protein aggregates and protect against mutant protein neurotoxicity. We will also discuss some of the currently known mechanisms that induce autophagy, which may be beneficial for the treatment of these and other neurodegenerative disorders. 相似文献
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细胞自噬是一种利用溶酶体对自身细胞器进行分解、将产生的大分子物质予以回收利用的高度保守的细胞降解过程。饥饿、缺血、氧化应激等均可诱导其发生。自噬在细胞的发育和分化过程中起着至关重要的作用,和许多心血管疾病的发生、发展密切相关。正常的细胞自噬对心肌细胞有保护作用,自噬不足或自噬过度则可促发疾病或加重病变。本文综述细胞自噬在心血管疾病中的研究进展。 相似文献
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《Immunobiology》2022,227(3):152223
The present study intends to clarify the hypothesis that PVL-positive Methicillin-resistant S. aureus strain (PVL+-MRSA)-infected macrophages regulate autophagy and thus in turn inhibit phagocytosis through the in vitro and in vivo experiments. The autophagy of mouse macrophage cell line RAW264.7 was observed by fluorescence microscopy, and counted based on the number of each cell dot-like structure GFP-LC3. The protein levels of the phagocytic factors associated with autophagy were determined by western blotting. The phagocytosis of RAW264.7 on MRSA was determined by counting the colony. The clinically isolated and identified PVL+-MRSA strain was used to infect BALB/c mice (left nasal drip) to establish a mouse pneumonia model. PVL+-MRSA mice were then treated with 3-MA or linezolid. Bronchoalveolar lavage fluid (BALF) from mice was collected for macrophage counting by Flow cytometry assay. The right lung was aseptically isolated for counting the amount of bacteria. The results showed that PVL+-MRSA could induced the autophagy of macrophages, which in turn reduced the damage from macrophages, which were respectively alleviated by 3-MA and aggravated by rapamycin. Exogenous rPVL administrated into PVL--MRSA-infected macrophages caused the autophagy of macrophage. Exogenous rPVL, particularly A-Luk S-PV, administrated into macrophages also caused the autophagy of macrophage, which was reversed by PMX53, a C5aR antagonist. In a mouse pneumonia model, PVL+-MRSA could induced the autophagy of macrophages, which in turn reduced the damage from macrophages, which were respectively alleviated by 3-MA or linezolid. In conclusion, this study indicated PVL+-MRSA regulated macrophage autophagy, which in turns inhibit the phagocytosis of S. aureus by macrophage. This study may provide a potential target against S. aureus infection. 相似文献
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IL-6在类风湿关节炎(RA)、幼年特发性全身性关节炎(sJIA)、Castleman病、系统性红斑狼疮(SLE)等多种风湿免疫性疾病发生、进展过程中均有过量表达,且发挥关键作用.Tolicizumab是第一个人源性的IL-6R抗体,通过特异性识别结合IL-6R而阻断IL-6生物学活性,发挥抑制上述疾病炎症反应的作用.大量研究结果证实,tocilizumab不仅能明显缓解RA的临床症状,而且能防止关节继续破坏.此外,tocilizumab在治疗全身性和关节型sJIA、Castleman病、SLE、克罗恩病等风湿免疫性疾病也获得了巨大的成功. 相似文献
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本文对生物钟基因研究的最新进展进行了综述,重点阐述了近日钟基因通过自身的转录、翻译和调控形成近日节律的过程,介绍近日钟基因在心血管系统中的重要地位。 相似文献
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目的 探讨跟外侧神经的局部解剖特点及其与神经源性跟痛症的关系,为临床诊断治疗提供解剖学依据。 方法 32侧防腐成人尸体下肢标本,解剖观察跟外侧神经的起源、分支、走行和分布特点。 结果 跟外侧神经均起自于腓肠神经,9.38%以单干的形式出现,28.13%为双干,43.75%为3干,18.75%为4干。神经分布于足跟外侧及跟底外侧1/3的皮肤和跟垫组织以及骨膜。 结论 跟外侧神经在跟管内和覆盖于小趾展肌表面的足底腱膜外侧部的锐利缘处均有可能被卡压而引发神经源性跟痛症。 相似文献
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波形蛋白是中间纤维家族中的一种重要成员,主要存在于中胚层来源的细胞中。新近研究发现,波形蛋白的表达和分布位置的改变,可以影响细胞完整性,细胞信号转导,细胞生长、迁移、凋亡和基因表达等多种功能,从而引发一些疾病,本文综述了波形蛋白与疾病发生和诊断方面的研究进展。 相似文献