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How Mycobacterium tuberculosis builds a home: Single-cell analysis reveals M. tuberculosis ESX-1-mediated accumulation of anti-inflammatory macrophages in infected mouse lungs

ABSTRACT: Mycobacterium tuberculosis (MTB) infects and replicates in lung mononuclear phagocytes (MNPs) with astounding ability to evade elimination. A virulence determinant that contributes to MTB’s ability to survive within MNPs is ESX-1, a type VII secretion system. However, how MTB virulence factors influence mononuclear cell recruitment and/or differentiation remains unknown. Here, using single-cell RNA sequencing, we studied the role of ESX-1 in MNP heterogenicity and response in mice and murine bone marrow-derived macrophages. We found that ESX-1 is required for MTB to recruit diverse MNP subsets with high MTB burden. Further, MTB induces an anti-inflammatory signature that may lead to more permissive MNPs. Spatial transcriptomics revealed an upregulation of anti-inflammatory signals in MTB lesions, where monocyte-derived macrophages concentrate near MTB-infected cells. Together, our findings suggest that MTB ESX-1 mediates the recruitment and differentiation of anti-inflammatory MNPs, which MTB can infect and manipulate for survival.

ORGANISM(S): Mus musculus

PROVIDER: GSE263882 | GEO | 2024/04/20

REPOSITORIES: GEO

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How Mycobacterium tuberculosis builds a home: Single-cell analysis reveals M. tuberculosis ESX-1-mediated accumulation of anti-inflammatory macrophages in infected mouse lungs

Project description:Mycobacterium tuberculosis (MTB) infects and replicates in lung mononuclear phagocytes (MNPs) with astounding ability to evade elimination. A virulence determinant that contributes to MTB’s ability to survive within MNPs is ESX-1, a type VII secretion system. However, how MTB virulence factors influence mononuclear cell recruitment and/or differentiation remains unknown. Here, using single-cell RNA sequencing, we studied the role of ESX-1 in MNP heterogenicity and response in mice and murine bone marrow-derived macrophages. We found that ESX-1 is required for MTB to recruit diverse MNP subsets with high MTB burden. Further, MTB induces an anti-inflammatory signature that may lead to more permissive MNPs. Spatial transcriptomics revealed an upregulation of anti-inflammatory signals in MTB lesions, where monocyte-derived macrophages concentrate near MTB-infected cells. Together, our findings suggest that MTB ESX-1 mediates the recruitment and differentiation of anti-inflammatory MNPs, which MTB can infect and manipulate for survival.

2024-04-20 | GSE263880 | GEO

How Mycobacterium tuberculosis builds a home: Single-cell analysis reveals M. tuberculosis ESX-1-mediated accumulation of anti-inflammatory macrophages in infected mouse lungs

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Project description:The principal virulence determinant of Mycobacterium tuberculosis (Mtb), the ESX-1 protein secretion system, is positively controlled at the transcriptional level by EspR. Depletion of EspR reportedly affects a small number of genes, both positively or negatively, including a key ESX-1 component, the espACD operon. EspR is also thought to be an ESX-1 substrate. Using EspR-specific antibodies in ChIP-Seq experiments (chromatin immunoprecipitation followed by ultra-high throughput DNA sequencing) we show that EspR binds to at least 165 loci on the Mtb genome. Included in the EspR regulon are genes encoding not only EspA, but also EspR itself, the ESX-2 and ESX-5 systems, a host of diverse cell wall functions, such as production of the complex lipid PDIM (phenolthiocerol dimycocerosate) and the PE/PPE cell-surface proteins. EspR binding sites are not restricted to promoter regions and can be clustered. This suggests that rather than functioning as a classical regulatory protein EspR acts globally as a nucleoid-associated protein capable of long-range interactions consistent with a recently established structural model. EspR expression was shown to be growth phase-dependent, peaking in the stationary phase. Overexpression in Mtb strain H37Rv revealed that EspR influences target gene expression both positively or negatively leading to growth arrest. At no stage was EspR secreted into the culture filtrate. Thus, rather than serving as a specific activator of a virulence locus, EspR is a novel nucleoid-associated protein, with both architectural and regulatory roles, that impacts cell wall functions and pathogenesis through multiple genes. ChIP-Seq of EspR in Mtb H37Rv at mid-log phase of growth. Two independent experiments were performed. Input DNA (No IP) was used as a control.

2012-04-02 | E-GEOD-35149 | biostudies-arrayexpress

Virulence regulator EspR of Mycobacterium tuberculosis is a nucleoid-associated protein

2012-04-02 | GSE35149 | GEO

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Project description:The ESX-1, type VII, secretion system represents the major virulence determinant of Mycobacterium tuberculosis. The ESX-1 cluster comprises approximately twenty genes and encodes a specialized secretion apparatus, which releases effectors into the extracellular milieu. The goal of this study is to understand the role of EspL. We show that EspL, a protein of 115 amino acids, is essential for mediating ESX-1-dependent virulence and for stabilization of EspE, EspF and EspH protein levels. Indeed, an espL knock-out mutant was unable to replicate intracellularly, secrete ESX-1 substrates or stimulate innate cytokine production. Moreover, loss of EspL also leads to downregulation in M. tuberculosis of WhiB6, a redox-sensitive transcriptional activator of ESX-1 genes.

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Project description:Despite the discovery of Mycobacterium tuberculosis (Mtb) more than 130 years ago, Mtb physiology and the mechanisms of virulence are still not fully understood. The objective of this study was to compare and characterize the differentially abundant protein profiles of modern, pre-modern and ancient Mtb lineages. Using a comprehensive analysis of the proteome of Mtb lineages 3, 4, 5 and 7, unique and shared proteomic signatures in these modern, pre-modern and ancient Mtb lineages were delineated. Main proteomic findings were verified by using immunoblotting. In addition, analysis of multiple genome alignment of all lineages was performed using Geneious Prime software. Label-free peptide quantification of whole cells from Mtb lineage 3, 4, 5 and 7 yielded 38,346 unique peptides derived from 3092 proteins, representing 77% coverage of the predicted Mtb proteome. Mtb lineage-specific differential abundances was observed for 539 proteins. Lineage 7 exhibited a markedly reduced abundance of proteins involved in DNA repair, type VII ESX-3 and ESX-1 secretion systems, lipid metabolism and inorganic phosphate uptake, and an increased abundance of proteins involved in alternative pathways of the TCA cycle and the CRISPR/Cas system as compared to the other lineages. Lineages 3 and 4 exhibited a higher abundance of proteins involved in virulence, DNA repair, drug resistance and other metabolic pathways. The high throughput analysis of Mtb proteome by super resolution massspectrometry provided an insight into the differential expression of proteins between Mtb lineages 3, 4, 5 and 7 that may explain the slow growth and reduced virulence of lineage 7, as well as metabolic flexibility and the ability to survive under adverse growth conditions.

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Mycobacterium tuberculosis resides in lysosome-poor monocyte-derived lung cells during chronic infection

Project description:Mycobacterium tuberculosis (Mtb) infects multiple lung myeloid cell subsets and persists despite innate and adaptive immune responses. However, the mechanisms allowing Mtb to evade elimination by these subsets are not fully understood. Here, we determined that four weeks post infection, after development of adaptive immune responses, CD11clo monocyte-derived lung cells termed MNC1 (mononuclear cell subset 1), harbor more live Mtb compared to alveolar macrophages (AM), neutrophils, and less permissive CD11chi MNC2. Bulk RNA-seq analysis for these subsets identified that lysosome biogenesis pathway is underexpressed in MNC1. Functional assays confirmed that Mtb-permissive MNC1 are deficient in lysosome content, lysosomal acidification, and lysosomal activity compared to AM, and have less nuclear TFEB, a master regulator of lysosome biogenesis. Mtb infection does not alter lysosome deficiency in MNC1. Instead, Mtb recruits MNC1 and MNC2 to the lungs for its spread from AM to these subsets, which depend on Mtb ESX-1 secretion system. Furthermore, nilotinib-mediated TFEB activation enhances lysosome function of primary macrophages in vitro, and MNC1 and MNC2 in vivo, improving control of Mtb infection. Our results suggest that Mtb exploits lysosome-poor monocyte-derived lung cells for persistence; targeting lysosome biogenesis may be an effective approach to host-directed therapy for tuberculosis, enabling permissive lung cells to restrict and kill Mtb through autophagy and other mechanisms.

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Project description:Mononuclear phagocytes (MNP) encompass dendritic cells, monocytes and macrophages (MoMac), which exhibit antimicrobial, homeostatic and immunoregulatory functions. We integrated 178,651 MNP from 13 tissues across 41 datasets to generate a MNP single-cell RNA compendium (MNP-VERSE), a publicly available tool to map MNPs and defined conserved gene signatures of MNP populations. Next, we generated a MoMac-focused compendium that revealed an array of specialised cell subsets widely distributed across multiple tissues. Specific pathological forms were expanded in cancer and inflammation. All neoplastic tissues contained conserved tumour-associated macrophage populations. Particularly, we focused on IL4I1+CD274(PD-L1)+IDO1+ macrophages, which accumulated in the tumour periphery in a T cell-dependent manner via IFNg and CD40/CD40L-induced maturation from interferon-primed monocytes. IL4I1_Macs exhibited immune-suppressive characteristics through tryptophan degradation and promoted entry of regulatory T cell into tumours. This integrated analysis provides a robust online-available platform for uniform annotation and dissection of specific macrophage functions in healthy and pathological states.

2021-06-16 | GSE178209 | GEO

espB deletion mutant of Mycobacterium tuberculosis

2021-09-24 | PXD011475 | Pride

espL deletion mutant of Mycobacterium tuberculosis

Project description:The ESX-1, type VII, secretion system represents the major virulence determinant of Mycobacterium tuberculosis, one of the most successful intracellular pathogens. Here, by combining genetic and high-throughput approaches, we show that EspL, a protein of 115 amino acids, is essential for mediating ESX-1-dependent virulence and for stabilization of EspE, EspF and EspH protein levels. Indeed, an espL knock-out mutant was unable to replicate intracellularly, secrete ESX-1 substrates or stimulate innate cytokine production. Moreover, proteomic studies detected greatly reduced amounts of EspE, EspF and EspH in the espL mutant as compared to the wild type strain, suggesting a role for EspL as a chaperone. The latter conclusion was further supported by discovering that EspL interacts with EspD, which was previously demonstrated to stabilize the ESX-1 substrates and effector proteins, EspA and EspC. Moreover, loss of EspL also leads to downregulation in M. tuberculosis of WhiB6, a redox-sensitive transcriptional activator of ESX-1 genes. Overall, our data highlight the importance of a so-far overlooked, though conserved, component of the ESX-1 secretion system and begin to delineate the role played by EspE, EspF and EspH in virulence and host-pathogen interaction.

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