title: A Mouse Model of Latent Tuberculosis Infection to Study Intervention Strategies to Prevent Reactivation.
abstract: Infection with Mycobacterium tuberculosis (Mtb) is the leading cause of death in human immunodeficiency virus (HIV)+ individuals, particularly in Sub-Saharan Africa. Management of this deadly co-infection is a significant global health challenge that is exacerbated by the lack of efficient vaccines against both Mtb and HIV, as well as the lack of reliable and robust animal models for Mtb/HIV co-infection. Here we describe a tractable and reproducible mouse model to study the reactivation dynamics of latent Mtb infection following the loss of CD4+ T cells as it occurs in HIV-co-infected individuals. Whereas intradermally (i.d.) infected C57BL/6 mice contained Mtb within the local draining lymph nodes, depletion of CD4+ cells led to progressive systemic spread of the bacteria and induction of lung pathology. To interrogate whether reactivation of Mtb after CD4+ T cell depletion can be reversed, we employed interleukin (IL)-2/anti-IL-2 complex-mediated cell boost approaches. Although populations of non-CD4 lymphocytes, such as CD8+ memory T cells, natural killer (NK) cells and double-negative (DN) T cells significantly expanded after IL-2/anti-IL-2 complex treatment, progressive development of bacteremia and pathologic lung alterations could not be prevented. These data suggest that the failure to reverse Mtb reactivation is likely not due to anergy of the expanded cell subsets and rather indicates a limited potential for IL-2-complex-based therapies in the management of Mtb/HIV co-infection.
authors.affiliation: Department of Immunology, Max Planck Institute for Infection Biology, Berlin, Germany.|Centre for Biosecurity and Tropical Infectious Diseases, Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, QLD, Australia.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kupz
authors.affiliation: Department of Immunology, Max Planck Institute for Infection Biology, Berlin, Germany.
authors.forename: Ulrike
authors.initials: U
authors.lastname: Zedler
authors.affiliation: Department of Immunology, Max Planck Institute for Infection Biology, Berlin, Germany.
authors.forename: Manuela
authors.initials: M
authors.lastname: Stäber
authors.affiliation: Department of Immunology, Max Planck Institute for Infection Biology, Berlin, Germany.
authors.forename: Stefan H E
authors.identifier: http://orcid.org/0000-0001-9866-8268
authors.initials: SH
authors.lastname: Kaufmann
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000473:pathology; D004195:Disease Models, Animal; D006801:Humans; D007376:Interleukin-2 / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology / Q000473:pathology; D055985:Latent Tuberculosis / Q000276:immunology* / Q000473:pathology / Q000517:prevention & control; D008168:Lung / Q000276:immunology* / Q000473:pathology; D051379:Mice; D009169:Mycobacterium tuberculosis / Q000276:immunology*; D014397:Tuberculosis, Pulmonary / Q000276:immunology* / Q000473:pathology / Q000517:prevention & control
chemical_list: D007376:Interleukin-2