Mycobacterial Interactions with Host Cells

The primary goal of our research group is to enhance understanding of host-pathogen interactions in TB and TB/HIV coinfection at the molecular and cellular levels. This includes discovering novel virulence genes in M. tuberculosis and identifying immune mechanisms involved in host defense against these pathogens, with the ultimate aim of proposing improved strategies for disease control.

We study host-pathogen interactions in tuberculosis, with a special interest in deciphering immunity to TB and the links between M. tuberculosis evolution, physiology and virulence.

Our research focuses on exploring the connections between metabolism and virulence in the TB bacillus, Mycobacterium tuberculosis, and how these connections have evolved over time. Specifically, we utilize transposon mutant library screening (Tn-seq) to identify genes and pathways involved in host-pathogen interactions in TB. Notably, we have identified a novel mechanism of innate immune control of pathogens through zinc intoxication and discovered resistance strategies in pathogenic mycobacteria involving P-ATPases. Currently, we are elucidating the function of several P-ATPases and their metallochaperones in the physiology and virulence of M. tuberculosis. Additionally, we employ Tn-seq analysis to investigate how M. tuberculosis adapts to various host-imposed stresses, particularly hypoxia.

Our lab is also focused on understanding innate and adaptive immunity to TB. Specifically, we are investigating the role of innate receptors, particularly C-type lectins, and host cell-expressed glycans in anti-mycobacterial immunity. For example, we recently discovered that the C-type lectin DCIR modulates immunity to TB by maintaining type I interferon signaling in dendritic cells. We are deciphering the molecular mechanisms involved in DCIR signaling through biochemical and (phospho)proteomic experiments.
Additionally, we are exploring the role of cytotoxic T cells in the host defense against M. tuberculosis. In this context, we are developing imaging and functional approaches to determine which subpopulations of T lymphocytes have optimal access, interaction, and functional properties for targeting M. tuberculosis-infected cells.

Finally, in the context of TB/HIV co-infection, a leading hypothesis is that infection of macrophages by M. tuberculosismodulates the local inflammatory environment, promoting HIV-1 replication. We are currently using various in vitro approaches to simulate this ‘bystander’ effect originating from sites of M. tuberculosis infection, aiming to dissect the molecular and cellular mechanisms that increase the susceptibility of human monocytes and macrophages to HIV-1 infection. In parallel, we are correlating our in vitro findings with in vivo observations by studying pulmonary lesions in non-human primates and analyzing human samples, including sera and pleural effusion fluid. Our ultimate goal is to identify novel targets with diagnostic and therapeutic potential to address the co-morbidity between AIDS and TB.

Team members

Research Scientists

Claude Gutierrez (University)
Denis Hudrisier (University)
Fabien Letisse (University)
Geanncarlo Lugo (CNRS)
Olivier Neyrolles (CNRS)
Yannick Poquet (University)
Yoann Rombouts (CNRS)
Philippe Vogeleer (University)

Research Engineers

Nelly Gilles
Florence Levillain (CNRS)
Bertille Voisin

Postdoctoral Fellows

Saurabh Chugh
Pierre Dupuy
Tejan Lodhiya

PhD Students

Louis Benastre
Maxime Caouaille
Wendy Le Mouellic
Sarah Monard
Maxime Pingret
Stella Rousset

Boudehen*, Faucher* et al. (2022) Mycobacterial resistance to zinc poisoning requires assembly of P-ATPase-containing membrane metal efflux platforms. Nat Commun

Corral et al. (2022) ILC precursors differentiate into metabolically distinct ILC1-like cells during Mycobacterium tuberculosis infection. Cell Rep

Souriant et al. (2019) Tuberculosis exacerbates HIV-1 infection through IL-10/STAT3-dependent tunneling nanotube formation in macrophages. Cell Rep

Troegeler et al. (2017) C-type lectin receptor DCIR modulates immunity to tuberculosis by sustaining type I interferon signaling in dendritic cells. Proc Natl Acad Sci USA

Freire*, Gutierrez* et al. (2019) An NAD+ phosphorylase toxin triggers Mycobacterium tuberculosis cell death. Mol Cell

Levillain*, Poquet* et al. (2017) Horizontal acquisition of a hypoxia-responsive molybdenum cofactor biosynthesis pathway contributed to Mycobacterium tuberculosis pathoadaptation. PLOS Pathog

Confocal microscopy imaging of functional membrane micro domains (blue) in Mycobacterium tuberculosis © Y.-M. Boudehen