The chemokine receptor CXCR3 attenuates the control of chronic Mycobacterium tuberculosis infection in BALB/c mice

Soumya D. Chakravarty, Jiayong Xu, Bao Lu, Craig Gerard, JoAnne Flynn, John Chan

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The chemokine receptor CXCR3 plays a significant role in regulating the migration of Th1 cells. Given the importance of Th1 immunity in the control of tuberculous infection, the results of the present study demonstrating that CXCR3-deficient BALB/c mice are more resistant to Mycobacterium tuberculosis, compared with wild-type mice, is surprising. This enhanced resistance manifests in the chronic but not the acute phase of infection. Remarkable differences in the cellular composition of the pulmonic granuloma of the CXCR3-/- and wild-type mice were found, the most striking being the increase in the number of CD4+ T cells in the knockout strain. In the chronic phase of infection, the number of CD69-expressing CD4+ T lymphocytes in the lungs of CXCR3-/- mice was higher than in wild-type mice. Additionally, at 1 mo postinfection, the number of IFN-γ-producing CD4+ T cells in the lungs and mediastinal lymph nodes of the CXCR3-deficient strain was elevated compared with wild-type mice. Pulmonic expression of IFN-γ, IL-12, TNF-α, or NO synthase 2, the principal antimycobacterial factors, were equivalent in the two mouse strains. These results indicate that: 1) CXCR3 plays a role in modulating the cellular composition of tuberculous granuloma; 2) CXCR3 impairs antimycobacterial activity in chronic tuberculosis; and 3) in the absence of CXCR3, mice exhibit a heightened state of CD4+ T lymphocyte activation in the chronic phase of infection that is associated with enhanced CD4+ T cell priming. Therefore, CXCR3 can attenuate the host immune response to M. tuberculosis by adversely affecting T cell priming.

Original languageEnglish (US)
Pages (from-to)1723-1735
Number of pages13
JournalJournal of Immunology
Volume178
Issue number3
StatePublished - Feb 1 2007

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Mycobacterium Infections
Chemokine Receptors
Mycobacterium tuberculosis
T-Lymphocytes
Lung
Granuloma
Infection
Th1 Cells
Interleukin-12
Lymphocyte Activation
Infection Control
Nitric Oxide Synthase
Immunity
Tuberculosis
Lymph Nodes

ASJC Scopus subject areas

  • Immunology

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The chemokine receptor CXCR3 attenuates the control of chronic Mycobacterium tuberculosis infection in BALB/c mice. / Chakravarty, Soumya D.; Xu, Jiayong; Lu, Bao; Gerard, Craig; Flynn, JoAnne; Chan, John.

In: Journal of Immunology, Vol. 178, No. 3, 01.02.2007, p. 1723-1735.

Research output: Contribution to journalArticle

Chakravarty, Soumya D. ; Xu, Jiayong ; Lu, Bao ; Gerard, Craig ; Flynn, JoAnne ; Chan, John. / The chemokine receptor CXCR3 attenuates the control of chronic Mycobacterium tuberculosis infection in BALB/c mice. In: Journal of Immunology. 2007 ; Vol. 178, No. 3. pp. 1723-1735.
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