VDAC1 oligomers

  • 文章类型: Journal Article
    2型糖尿病(T2D)是一种慢性代谢性疾病,占糖尿病患者的90%以上。其主要特征是由于胰岛素抵抗或胰岛素缺乏引起的高血糖。随着饮食和生活习惯的改变,近几十年来,青少年T2D的发病率已经爆发。暴露于环境污染物的恶化进一步加剧了T2D的流行,因此,它带来了巨大的经济负担。因此,早期预防和对症治疗对于预防糖尿病并发症至关重要。T2D患者的线粒体数量和电子传递链活性降低。电压依赖性阴离子通道1(VDAC1),作为线粒体外膜上的关键通道蛋白,调节线粒体和其他细胞成分之间的信号转导,参与各种生物过程。当VDAC1以寡聚形式存在时,它还促进大分子进出线粒体,调节胰岛素分泌。我们总结并强调了VDAC1和T2D之间的相互作用,特别是在与环境污染物相关的T2D中,阐明靶向VDAC1单体和寡聚体的潜在治疗意义,为T2D的治疗提供了新的可能靶点。
    Type 2 diabetes (T2D) is a chronic metabolic disease that accounts for more than 90% of diabetic patients. Its main feature is hyperglycemia due to insulin resistance or insulin deficiency. With changes in diet and lifestyle habits, the incidence of T2D in adolescents has burst in recent decades. The deterioration in the exposure to the environmental pollutants further aggravates the prevalence of T2D, and consequently, it imposes a significant economic burden. Therefore, early prevention and symptomatic treatment are essential to prevent diabetic complications. Mitochondrial number and electron transport chain activity are decreased in the patients with T2D. Voltage-Dependent Anion Channel 1 (VDAC1), as a crucial channel protein on the outer membrane of mitochondria, regulates signal transduction between mitochondria and other cellular components, participating in various biological processes. When VDAC1 exists in oligomeric form, it additionally facilitates the entry and exit of macromolecules into and from mitochondria, modulating insulin secretion. We summarize and highlight the interplay between VDAC1 and T2D, especially in the environmental pollutants-related T2D, shed light on the potential therapeutic implications of targeting VDAC1 monomers and oligomers, providing a new possible target for the treatment of T2D.
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  • 文章类型: Journal Article
    作为一种持久性有机污染物,全氟辛烷磺酸(PFOS)对人类健康有严重的不利影响。有人认为全氟辛烷磺酸与肝脏炎症有关。然而,潜在机制尚不清楚.这里,发现全氟辛烷磺酸可提高小鼠肝脏和人正常肝细胞L-02中电压依赖性阴离子通道1(VDAC1)的寡聚化趋势。VDAC1寡聚化的抑制减轻了PFOS诱导的核苷酸结合域和富含亮氨酸的重复蛋白-3(NLRP3)炎性体激活。还观察到细胞质膜VDAC1对全氟辛烷磺酸的反应易位到线粒体。因此,VDAC1的寡聚化主要发生在线粒体中。在PFOS处理下,发现VDAC1与ATP合酶β亚基(ATP5B)相互作用。敲除ATP5B或将ATP5B固定到胞质膜减轻了增加的VDAC1寡聚化和NLRP3炎性体激活。因此,我们的结果表明,全氟辛烷磺酸通过VDAC1寡聚化诱导NLRP3炎性体激活,依赖于ATP5B将VDAC1从质膜转移到线粒体的过程。这些发现为NLRP3炎性体的激活提供了新的观点,VDAC1寡聚化的调控模式,以及全氟辛烷磺酸的毒性机制。
    As a persistent organic pollutant, perfluorooctane sulfonate (PFOS) has a serious detrimental impact on human health. It has been suggested that PFOS is associated with liver inflammation. However, the underlying mechanisms are still unclear. Here, PFOS was found to elevate the oligomerization tendency of voltage-dependent anion channel 1 (VDAC1) in the mice liver and human normal liver cells L-02. Inhibition of VDAC1 oligomerization alleviated PFOS-induced nucleotide-binding domain and leucine-rich repeat protein-3 (NLRP3) inflammasome activation. Cytoplasmic membrane VDAC1 translocated to mitochondria was also observed in response to PFOS. Therefore, the oligomerization of VDAC1 occurred mainly in the mitochondria. VDAC1 was found to interact with the ATP synthase beta subunit (ATP5B) under PFOS treatment. Knockdown of ATP5B or immobilization of ATP5B to the cytoplasmic membrane alleviated the increased VDAC1 oligomerization and NLRP3 inflammasome activation. Therefore, our results suggested that PFOS induced NLRP3 inflammasome activation through VDAC1 oligomerization, a process dependent on ATP5B to transfer VDAC1 from the plasma membrane to the mitochondria. The findings offer novel perspectives on the activation of the NLRP3 inflammasome, the regulatory mode on VDAC1 oligomerization, and the mechanism of PFOS toxicity.
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