The course of tuberculosis infection in hyper-susceptible mice carrying the H2ᵛ haplotype
- Authors: Baikuzina P.G.1,2, Gorbacheva D.V.1,2, Apt A.S.1, Korotetskaya M.V.1,3
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Affiliations:
- Central TB Research Institute
- Skolkovo Institute of Science and Technology
- M.V. Lomonosov Moscow State University
- Issue: Vol 14, No 3 (2024)
- Pages: 525-531
- Section: SHORT COMMUNICATIONS
- URL: https://bakhtiniada.ru/2220-7619/article/view/262075
- DOI: https://doi.org/10.15789/2220-7619-TCO-16612
- ID: 262075
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Abstract
Genetic regulation of the host susceptibility to Mycobacterium tuberculosis (Mtb) and severity of tuberculosis (TB) infection remain incompletely investigated. Identification of particular genes and involved in TB control and immune reactions regulated by these genes is essential for our understanding of pathogenesis of the disease, discovery of drug targets and rational vaccine development. We have shown that mice of the B10.SM (H2ᵛ) strain are extremely TB susceptible; meanwhile, the general genome structure of this mouse strain and the H2ᵛ haplotype itself are poorly characterized. We selected a pool of Mit genetic markers differentiating B10.SM mice from Chr. 17-congenic mice of the B10 strain by the PCR products motility in the electrophoresis setting. TB susceptibility of B10 mice is much lower than that of B10.SM. In the model of infection triggered by two different dosed of Mtb (100 and 600 CFU per mouse) administered via respiratory tract we demonstrated that B10.SM mice have significantly shorter survival time and significantly higher lung mycobacterial multiplication compared to B10 mice. We demonstrated (intracellular staining and ELISA) that IFNγ production in the lungs of infected mice of the two strains corresponds well to their disease phenotypes. Thus, more resistant B10 mice possess significantly more lung IFNγ-positive CD4⁺ T cells and a higher level of IFNγ secretion. We have established (B10х B10.SM) F1 hybrids and demonstrated that the post-infection phenotypes of survival time, lung mycobacterial multiplication and IFNγ production in these mice are intermediate compared to parental mice. Thus, we deal with the genetic trait with incomplete dominance expression. These data were confirmed in F2 hybrids by segregation genetic analysis. To characterize the phenotype of B10.SM mice in more detail, we vaccinated these mice with the BCG vaccine before TB challenge. Vaccination significantly prolonged survival time, diminished mycobacterial multiplication in the lungs and the degree of lung tissue pathology. Thus, a high level of susceptibility to primary infection did not interfere with BCG vaccination efficacy. We intend to continue genetic and immunologic analyses of TB-hyper-susceptible B10.SM mice. Experimental data regarding the cause of extreme disturbances in protection against infection are prerequisite for our better understanding causality of the wide spectrum of TB manifestations in human populations, as well as for rational search for novel vaccines and medications against TB infection.
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##article.viewOnOriginalSite##About the authors
P. G. Baikuzina
Central TB Research Institute; Skolkovo Institute of Science and Technology
Email: mkorotetskaya@gmail.com
Research Assistant, Laboratory for Immunogenetics, Department of Immunology, Technician
Russian Federation, 107564, Moscow, Yauzskaya avenue, 2; MoscowD. V. Gorbacheva
Central TB Research Institute; Skolkovo Institute of Science and Technology
Email: mkorotetskaya@gmail.com
Research Assistant, Laboratory for Immunogenetics, Department of Immunology, Moscow Undergraduate Student, Faculty of Bioengineering and Bioinformatics
Russian Federation, 107564, Moscow, Yauzskaya avenue, 2; MoscowA. S. Apt
Central TB Research Institute
Email: mkorotetskaya@gmail.com
DSc (Biology), Professor, Head of the Laboratory of Immunogenetics, Immunology Department
Russian Federation, 107564, Moscow, Yauzskaya avenue, 2Mariya V. Korotetskaya
Central TB Research Institute; M.V. Lomonosov Moscow State University
Author for correspondence.
Email: mkorotetskaya@gmail.com
PhD (Biology), Senior Researcher, Laboratory of Immunogenetics, Department of Immunology, Lecturer, Department of Bioengineering and Bioinformatics
Russian Federation, 107564, Moscow, Yauzskaya avenue, 2; MoscowReferences
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