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Title: Low Levels of T Cell Exhaustion in Tuberculous Lung Granulomas

Journal Article · · Infection and Immunity
DOI:https://doi.org/10.1128/IAI.00426-18· OSTI ID:1544219
 [1];  [2];  [3];  [4];  [5];  [2]; ORCiD logo [1]
  1. Univ. of Pittsburgh, PA (United States), School of Medicine
  2. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Microbiology and Immunology
  3. Univ. of Pittsburgh, PA (United States). Dept. of Infectious Disease and Microbiology
  4. Univ. of Pittsburgh, PA (United States). Dept. of Lab. Animal Research
  5. Univ. of Pittsburgh, PA (United States). Dept. of Pediatrics

The hallmarks of pulmonary Mycobacterium tuberculosis infection are lung granulomas. These organized structures are composed of host immune cells whose purpose is to contain or clear infection, creating a complex hub of immune and bacterial cell activity, as well as limiting pathology in the lungs. Yet, given cellular activity and the potential for frequent interactions between host immune cells and M. tuberculosis-infected cells, we observed a surprisingly low quantity of cytokine-producing T cells (<10% of granuloma T cells) in our recent study of M. tuberculosis infection within nonhuman primate (NHP) granulomas. Various mechanisms could limit T cell function, and one hypothesis is T cell exhaustion. T cell exhaustion is proposed to result from continual antigen stimulation, inducing them to enter a state characterized by low cytokine production, low proliferation, and expression of a series of inhibitory receptors, the most common being PD-1, LAG-3, and CTLA-4. In this work, we characterized the expression of inhibitory receptors on T cells and the functionality of these cells in tuberculosis (TB) lung granulomas. We then used these experimental data to calibrate and inform an agent-based computational model that captures environmental, cellular, and bacterial dynamics within granulomas in lungs during M. tuberculosis infection. Together, the results of the modeling and the experimental work suggest that T cell exhaustion alone is not responsible for the low quantity of M. tuberculosis-responsive T cells observed within TB granulomas and that the lack of exhaustion is likely an intrinsic property of granuloma structure.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AI123093; HL131072; HL110811; T32AI060525; MCB140228; AC02-05CH11231
OSTI ID:
1544219
Journal Information:
Infection and Immunity, Vol. 86, Issue 9; ISSN 0019-9567
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (4)

Agent‐based models of inflammation in translational systems biology: A decade later journal June 2019
The current state of animal models and genomic approaches towards identifying and validating molecular determinants of Mycobacterium tuberculosis infection and tuberculosis disease journal June 2019
The End of the Binary Era: Revisiting the Spectrum of Tuberculosis journal October 2018
A computational model tracks whole-lung Mycobacterium tuberculosis infection and predicts factors that inhibit dissemination journal May 2020

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