Control of tuberculosis (TB) remains a global health priority despite a significant decrease in its prevalence within the past century. New challenges have emerged with the appearance of drug resistant forms of M.tb and the realization that the existing BCG vaccine is not sufficiently effective to eradicate the disease. Thus, the emergence and spread of drug resistant forms of Mycobacterium tuberculosis (M.tb) represents a significant global threat of re-emerging epidemics of TB with no effective therapies in sight.. Given the dearth of new drugs targeting the pathogen, interventions targeting host cells are urgently needed. However, our limited understanding of the virulence stragegy of M.tb remains a major obstacle to its complete eradication. In our view two major gaps exist on the host side: what makes some immunocompetent individuals more susceptible to M.tb than the majority of the population, and what makes the lungs an organ that is particularly vulnerable to M.tb. The lung is central to the virulence strategy of M.tb, because aerosol is the only epidemiologically significant route of M.tb transmission in human populations. Interventions that target the lung to enhance mechanisms of local immunity and prevent lung damage may produce the biggest epidemiological impact by preventing M.tb transmission.
We pursue identification of pathways exploited by the pathogen in the lungs of susceptible individuals – a critical node in the extremely successful evolutionary strategy of M.tb – and the development of targeted interventions. Our lab and collaborators described a novel mouse model of human-like pulmonary tuberculosis. The key element of this model is the development of well organized necrotic granulomas, which closely resemble the human disease, specifically in the lungs of otherwise immunocompetent mice. Using forward genetic analysis we identifed the sst1 locus as the one responsible for necrotization of the lung granulomas and identified the candidate gene Ipr1 using positional cloning. We have found that the Ipr1 protein is an interferon-inducible chromatin-associated protein involved in control of macrophage activation and death. Our current efforts are focused on understanding the Ipr1-mediated biochemical pathways and their role in host resistance to infections, control of lung inflammation and tissue damage. In addition we have developed a screening strategy to identify compounds that enhance the Ipr1 function, which can be developed into novel drugs that increase host resistance to M.tuberculosis and related infections.
During the course of these studies we documented the development of lung squamous cell carcinomas (SSC) at the chronic stages of tuberculosis infection. Because squamous cell carcinomas do not occur in our mouse strains spontaneously, we concluded that M.tb infection was sufficient for both initiation and progression of lung SCC. These findings experimentally proved a causal link between tuberculosis and lung cancers, recently confirmed by epidemiological analysis in humans. Thus the TB-infected lung presents a destabilizing environment for epithelial cells, yet factors influencing epithelial cell function in the context of chronic infection have not been much studied. We study lung epithelial cells over the course of TB infection to understand mechanisms of their injury, repair, and neoplastic transformation in order to develop interventions that restore epithelial cell homeostasis and prevent initiation of lung tumors during TB progression.
- Associate Professor, Microbiology, Boston University School of Medicine
- Faculty, National Emerging Infectious Disease Lab, Boston University
- Member, Pulmonary Center, Boston University
- Member, Evans Center for Interdisciplinary Biomedical Research, Boston University
- Member, Genome Science Institute, Boston University
- Boston Medical Center
- Graduate Faculty (Primary Mentor of Grad Students), Boston University School of Medicine, Graduate Medical Sciences
- Samara State Medical University, MD
- Russian Academy of Medical Sciences, PhD
- Published on 3/15/2022
Yabaji SM, Chatterjee S, Waligursky E, Gimelbrant A, Kramnik I. Medium throughput protocol for genome-based quantification of intracellular mycobacterial loads and macrophage survival during in vitro infection. STAR Protoc. 2022 Jun 17; 3(2):101241. PMID: 35310069.
- Published on 8/17/2021
Koyuncu D, Niazi MKK, Tavolara T, Abeijon C, Ginese ML, Liao Y, Mark C, Specht A, Gower AC, Restrepo BI, Gatti DM, Kramnik I, Gurcan M, Yener B, Beamer G. CXCL1: A new diagnostic biomarker for human tuberculosis discovered using Diversity Outbred mice. PLoS Pathog. 2021 08; 17(8):e1009773. PMID: 34403447.
- Published on 7/10/2021
Chatterjee S, Yabaji SM, Rukhlenko OS, Bhattacharya B, Waligurski E, Vallavoju N, Ray S, Kholodenko BN, Brown LE, Beeler AB, Ivanov AR, Kobzik L, Porco JA, Kramnik I. Channeling macrophage polarization by rocaglates increases macrophage resistance to Mycobacterium tuberculosis. iScience. 2021 Aug 20; 24(8):102845. PMID: 34381970.
- Published on 6/21/2021
Ji DX, Witt KC, Kotov DI, Margolis SR, Louie A, Chevée V, Chen KJ, Gaidt MM, Dhaliwal HS, Lee AY, Nishimura SL, Zamboni DS, Kramnik I, Portnoy DA, Darwin KH, Vance RE. Role of the transcriptional regulator SP140 in resistance to bacterial infections via repression of type I interferons. Elife. 2021 06 21; 10. PMID: 34151776.
- Published on 3/1/2021
Ordonez AA, Tucker EW, Anderson CJ, Carter CL, Ganatra S, Kaushal D, Kramnik I, Lin PL, Madigan CA, Mendez S, Rao J, Savic RM, Tobin DM, Walzl G, Wilkinson RJ, Lacourciere KA, Via LE, Jain SK. Visualizing the dynamics of tuberculosis pathology using molecular imaging. J Clin Invest. 2021 03 01; 131(5). PMID: 33645551.
- Published on 2/1/2021
Bhattacharya B, Xiao S, Chatterjee S, Urbanowski M, Ordonez A, Ihms EA, Agrahari G, Lun S, Berland R, Pichugin A, Gao Y, Connor J, Ivanov AR, Yan BS, Kobzik L, Koo BB, Jain S, Bishai W, Kramnik I. The integrated stress response mediates necrosis in murine Mycobacterium tuberculosis granulomas. J Clin Invest. 2021 02 01; 131(3). PMID: 33301427.
- Published on 10/30/2020
Apt AS, Kramnik I, McMurray DN. Editorial: Mycobacteria-Host Interactions: Genetics, Immunity, Pathology. Front Cell Infect Microbiol. 2020; 10:611216. PMID: 33194847.
- Published on 6/19/2020
Gregory DJ, DeLoid GM, Salmon SL, Metzger DW, Kramnik I, Kobzik L. SON DNA-binding protein mediates macrophage autophagy and responses to intracellular infection. FEBS Lett. 2020 09; 594(17):2782-2799. PMID: 32484234.
- Published on 5/1/2020
Ji DX, Yamashiro LH, Chen KJ, Mukaida N, Kramnik I, Darwin KH, Vance RE. Publisher Correction: Type I interferon-driven susceptibility to Mycobacterium tuberculosis is mediated by IL-1Ra. Nat Microbiol. 2020 05; 5(5):777. PMID: 32300234.
- Published on 4/15/2020
Kurtz SL, Rossi AP, Beamer GL, Gatti DM, Kramnik I, Elkins KL. The Diversity Outbred Mouse Population Is an Improved Animal Model of Vaccination against Tuberculosis That Reflects Heterogeneity of Protection. mSphere. 2020 04 15; 5(2). PMID: 32295871.
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