Wnt5A 介导的肌动蛋白组织调节宿主对细菌病原体和非病原体的反应。

Wnt5A-Mediated Actin Organization Regulates Host Response to Bacterial Pathogens and Non-Pathogens.

机构信息

Division of Cancer Biology and Inflammatory Disorder, CSIR-Indian Institute of Chemical Biology, Kolkata, India.

出版信息

Front Immunol. 2021 Feb 16;11:628191. doi: 10.3389/fimmu.2020.628191. eCollection 2020.

Abstract

Wnt5A signaling facilitates the killing of several bacterial pathogens, but not the non-pathogen DH5α. The basis of such pathogen vs. non-pathogen distinction is unclear. Accordingly, we analyzed the influence of Wnt5A signaling on pathogenic K1 in relation to non-pathogenic K12-MG1655 and DH5α eliminating interspecies variability from our study. Whereas cell internalized K1 disrupted cytoskeletal actin organization and multiplied during Wnt5A depletion, rWnt5A mediated activation revived cytoskeletal actin assembly facilitating K1 eradication. Cell internalized K12-MG1655 and DH5α, which did not perturb actin assembly appreciably, remained unaffected by rWnt5A treatment. Phagosomes prepared separately from Wnt5A conditioned medium treated K1 and K12-MG1655 infected macrophages revealed differences in the relative levels of actin and actin network promoting proteins, upholding that the Wnt5A-Actin axis operates differently for internalized pathogen and non-pathogen. Interestingly, exposure of rWnt5A treated K1 and K12-MG1655/DH5α infected macrophages to actin assembly inhibitors reversed the scenario, blocking killing of K1, yet promoting killing of both K12-MG1655 and DH5α. Taken together, our study illustrates that the state of activation of the Wnt5A/Actin axis in the context of the incumbent bacteria is crucial for directing host response to infection.

摘要

Wnt5A 信号促进了几种细菌病原体的杀伤,但非病原体 DH5α 则不会。这种病原体与非病原体区分的基础尚不清楚。因此,我们分析了 Wnt5A 信号对致病性 K1 的影响,同时考虑到非致病性 K12-MG1655 和 DH5α,以消除我们研究中的种间变异性。虽然细胞内化的 K1 破坏了细胞骨架肌动蛋白的组织,并在 Wnt5A 耗竭时增殖,但 rWnt5A 介导的激活恢复了细胞骨架肌动蛋白的组装,有助于 K1 的消除。细胞内化的 K12-MG1655 和 DH5α 并没有明显破坏肌动蛋白组装,因此不受 rWnt5A 处理的影响。从 Wnt5A 条件培养基处理的 K1 和 K12-MG1655 感染的巨噬细胞中分别制备的吞噬体显示出肌动蛋白和促进肌动蛋白网络的蛋白相对水平的差异,这表明 Wnt5A-肌动蛋白轴对内化的病原体和非病原体的作用不同。有趣的是,将 rWnt5A 处理的 K1 和 K12-MG1655/DH5α 感染的巨噬细胞暴露于肌动蛋白组装抑制剂中,会反转这种情况,阻止 K1 的杀伤,但促进 K12-MG1655 和 DH5α 的杀伤。总之,我们的研究表明,在当前细菌的背景下,Wnt5A/Actin 轴的激活状态对于指导宿主对感染的反应至关重要。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2c80/7921742/04e318de41f0/fimmu-11-628191-g001.jpg

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