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A Noncanonical Autophagy Pathway Restricts Toxoplasma gondii Growth in a Strain-Specific Manner in IFN-γ-Activated Human Cells.

作者信息

Selleck Elizabeth M, Orchard Robert C, Lassen Kara G, Beatty Wandy L, Xavier Ramnik J, Levine Beth, Virgin Herbert W, Sibley L David

机构信息

Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, USA.

Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri, USA.

出版信息

mBio. 2015 Sep 8;6(5):e01157-15. doi: 10.1128/mBio.01157-15.


DOI:10.1128/mBio.01157-15
PMID:26350966
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4600106/
Abstract

UNLABELLED: A core set of autophagy proteins is required for gamma interferon (IFN-γ)-mediated clearance of Toxoplasma gondii in the mouse because of their control of several downstream effectors, including immunity-related GTPases (IRGs) and guanylate-binding proteins (GBPs). However, these effectors are absent (i.e., IRGs) from or nonessential (i.e., GBPs) in IFN-γ-activated human cells, raising the question of how these cells control parasite replication. Here, we define a novel role for ubiquitination and recruitment of autophagy adaptors in the strain-specific control of T. gondii replication in IFN-γ-activated human cells. Vacuoles containing susceptible strains of T. gondii became ubiquitinated, recruited the adaptors p62 and NDP52, and were decorated with LC3. Parasites within LC3-positive vacuoles became enclosed in multiple layers of host membranes, resulting in stunting of parasite replication. However, LC3-positive T. gondii-containing vacuoles did not fuse with endosomes and lysosomes, indicating that this process is fundamentally different from xenophagy, a form of autophagy involved in the control of intracellular bacterial pathogens. Genetic knockout of ATG16L or ATG7 reverted the membrane encapsulation and restored parasite replication, indicating that core autophagy proteins involved in LC3 conjugation are important in the control of parasite growth. Despite a role for the core autophagy machinery in this process, upstream activation through Beclin 1 was not sufficient to enhance the ubiquitination of T. gondii-containing vacuoles, suggesting a lack of reliance on canonical autophagy. These findings demonstrate a new mechanism for IFN-γ-dependent control of T. gondii in human cells that depends on ubiquitination and core autophagy proteins that mediate membrane engulfment and restricted growth. IMPORTANCE: Autophagy is a process of cellular remodeling that allows the cell to recycle senescent organelles and recapture nutrients. During innate immune responses in the mouse, autophagy is recruited to help target intracellular pathogens and thus eliminate them. However, the antimicrobial mediators that depend on autophagy in the mouse are not conserved in humans, raising the issue of how human cells control intracellular pathogens. Our study defines a new pathway for the control of the ubiquitous intracellular parasite T. gondii in human cells activated by IFN-γ. Recruitment of autophagy adaptors resulted in engulfment of the parasite in multiple membranes and growth impairment. Although susceptible type 2 and 3 stains of T. gondii were captured by this autophagy-dependent pathway, type 1 strains were able to avoid entrapment.

摘要

相似文献

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A Noncanonical Autophagy Pathway Restricts Toxoplasma gondii Growth in a Strain-Specific Manner in IFN-γ-Activated Human Cells.

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[8]
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本文引用的文献

[1]
Integrated Genomics of Crohn's Disease Risk Variant Identifies a Role for CLEC12A in Antibacterial Autophagy.

Cell Rep. 2015-6-30

[2]
The parasitophorous vacuole membrane of Toxoplasma gondii is targeted for disruption by ubiquitin-like conjugation systems of autophagy.

Immunity. 2014-6-12

[3]
Role of mouse and human autophagy proteins in IFN-γ-induced cell-autonomous responses against Toxoplasma gondii.

J Immunol. 2014-2-21

[4]
Toxoplasma GRA7 effector increases turnover of immunity-related GTPases and contributes to acute virulence in the mouse.

Proc Natl Acad Sci U S A. 2014-1-3

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Bacteria-autophagy interplay: a battle for survival.

Nat Rev Microbiol. 2014-1-2

[6]
Autophagy adaptor protein p62/SQSTM1 and autophagy-related gene Atg5 mediate autophagosome formation in response to Mycobacterium tuberculosis infection in dendritic cells.

PLoS One. 2013-12-23

[7]
Autophagy in infection, inflammation and immunity.

Nat Rev Immunol. 2013-10

[8]
Cell death of gamma interferon-stimulated human fibroblasts upon Toxoplasma gondii infection induces early parasite egress and limits parasite replication.

Infect Immun. 2013-9-16

[9]
Guanylate-binding protein 1 (Gbp1) contributes to cell-autonomous immunity against Toxoplasma gondii.

PLoS Pathog. 2013-4-25

[10]
CD40 induces anti-Toxoplasma gondii activity in nonhematopoietic cells dependent on autophagy proteins.

Infect Immun. 2013-3-18

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