M. tuberculosis infection of human iPSC-derived macrophages reveals complex membrane dynamics during xenophagy evasion

Autophagy; Macrophage; Stem cell; Tuberculosis; Xenophagy.
浏览次数:157 分享:
  • J Cell Sci
  • 3.6
  • 2020 Nov 25;134(5):jcs252973.
  • 流式
  • 呼吸系统
  • 呼吸系统
  • 巨噬细胞
  • 结核病
  • CD119,CD163,IgG1,Siglec-1 (CD169)
  • doi: 10.1242/jcs.252973.

Abstract

Xenophagy is an important cellular defence mechanism against cytosol-invading pathogens, such as Mycobacterium tuberculosis (Mtb). Activation of xenophagy in macrophages targets Mtb to autophagosomes; however, how Mtb is targeted to autophagosomes in human macrophages at a high spatial and temporal resolution is unknown. Here, we use human induced pluripotent stem cell-derived macrophages (iPSDMs) to study the human macrophage response to Mtb infection and the role of the ESX-1 type VII secretion system. Using RNA-seq, we identify ESX-1-dependent transcriptional responses in iPSDMs after infection with Mtb. This analysis revealed differential inflammatory responses and dysregulated pathways such as eukaryotic initiation factor 2 (eIF2) signalling and protein ubiquitylation. Moreover, live-cell imaging revealed that Mtb infection in human macrophages induces dynamic ESX-1-dependent, LC3B-positive tubulovesicular autophagosomes (LC3-TVS). Through a correlative live-cell and focused ion beam scanning electron microscopy (FIB SEM) approach, we show that upon phagosomal rupture, Mtb induces the formation of LC3-TVS, from which the bacterium is able to escape to reside in the cytosol. Thus, iPSDMs represent a valuable model for studying spatiotemporal dynamics of human macrophage-Mtb interactions, and Mtb is able to evade capture by autophagic compartments.Keywords: Autophagy; Macrophage; Stem cell; Tuberculosis; Xenophagy.
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