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作为细胞死亡机制调节因子的毒力因子

Virulence Factors of as Modulators of Cell Death Mechanisms.

作者信息

Ramon-Luing Lucero A, Palacios Yadira, Ruiz Andy, Téllez-Navarrete Norma A, Chavez-Galan Leslie

机构信息

Laboratory of Integrative Immunology, Instituto Nacional de Enfermedades Respiratorias "Ismael Cosío Villegas", Mexico City 14080, Mexico.

Escuela Militar de Graduados de Sanidad, Secretaría de la Defensa Nacional, Mexico City 11200, Mexico.

出版信息

Pathogens. 2023 Jun 18;12(6):839. doi: 10.3390/pathogens12060839.

Abstract

(Mtb) modulates diverse cell death pathways to escape the host immune responses and favor its dissemination, a complex process of interest in pathogenesis-related studies. The main virulence factors of Mtb that alter cell death pathways are classified according to their origin as either non-protein (for instance, lipomannan) or protein (such as the PE family and ESX secretion system). The 38 kDa lipoprotein, ESAT-6 (early antigen-secreted protein 6 kDa), and another secreted protein, tuberculosis necrotizing toxin (TNT), induces necroptosis, thereby allowing mycobacteria to survive inside the cell. The inhibition of pyroptosis by blocking inflammasome activation by Zmp1 and PknF is another pathway that aids the intracellular replication of Mtb. Autophagy inhibition is another mechanism that allows Mtb to escape the immune response. The enhanced intracellular survival (Eis) protein, other proteins, such as ESX-1, SecA2, SapM, PE6, and certain microRNAs, also facilitate Mtb host immune escape process. In summary, Mtb affects the microenvironment of cell death to avoid an effective immune response and facilitate its spread. A thorough study of these pathways would help identify therapeutic targets to prevent the survival of mycobacteria in the host.

摘要

结核分枝杆菌(Mtb)调节多种细胞死亡途径以逃避宿主免疫反应并促进其传播,这是发病机制相关研究中一个复杂且有趣的过程。Mtb中改变细胞死亡途径的主要毒力因子根据其来源可分为非蛋白质类(如脂甘露聚糖)或蛋白质类(如PE家族和ESX分泌系统)。38 kDa脂蛋白、早期分泌抗原靶6 kDa(ESAT-6)以及另一种分泌蛋白——结核坏死毒素(TNT)可诱导坏死性凋亡,从而使分枝杆菌能够在细胞内存活。通过Zmp1和PknF阻断炎性小体激活来抑制细胞焦亡是另一条有助于Mtb在细胞内复制的途径。自噬抑制是Mtb逃避免疫反应的另一种机制。增强型细胞内存活(Eis)蛋白、其他蛋白(如ESX-1、SecA2、SapM、PE6)以及某些微小RNA也有助于Mtb的宿主免疫逃逸过程。总之,Mtb影响细胞死亡的微环境以避免有效的免疫反应并促进其传播。对这些途径进行深入研究将有助于确定治疗靶点,以防止分枝杆菌在宿主体内存活。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0298/10304248/749a1549be97/pathogens-12-00839-g001.jpg

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