Airway delivery of silica increases susceptibility to mycobacterial infection in mice

Potential role of repopulating macrophages

Rajamouli Pasula, Bradley E Britigan, Joanne Turner, William J. Martin

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Silica exposure results in an increased lifelong risk of developing mycobacterial pulmonary infections. To date, there are no animal models that replicate this finding to permit assessment of the mechanisms underlying susceptibility to mycobacterial infection. To test the hypothesis that prior silica exposure increases risk of mycobacterial infection, we intratracheally (I.T.) administered silica, a control dust (Al2O3) or saline into mechanically ventilated C57BL/6 mice. Later, the mice received Mycobacterium avium or Mycobacterium tuberculosis I.T. Mice were sacrificed at defined time points and mycobacteria in lung homogenates were quantified. M. avium or M. tuberculosis infection was markedly increased in silica-exposed mice compared with mice exposed to either Al2O3 or saline beginning 3 wk after silica exposure. Similarly, lung sections from silica-exposed mice had many more acid fast bacilli+ (AFB +) organisms than from control mice. Alveolar macrophages (AMs) from bronchoalveolar lavage of silica-exposed mice also revealed a higher number of mycobacteria compared with mice treated with Al2O3 or saline. In addition, passive transfer of AMs from silica-exposed mice to control mice increased M. tuberculosis susceptibility. These results indicate that silica exposure converts mycobacteria-resistant mice into mycobacteria- susceptible mice via a process that likely involves a new population of AMs that are more susceptible to mycobacterial infection.

Original languageEnglish (US)
Pages (from-to)7102-7109
Number of pages8
JournalJournal of Immunology
Volume182
Issue number11
DOIs
StatePublished - Jun 1 2009

Fingerprint

Silicon Dioxide
Macrophages
Infection
Mycobacterium
Alveolar Macrophages
Mycobacterium tuberculosis
Mycobacterium avium
Lung
Mycobacterium Infections
Bronchoalveolar Lavage
Dust
Inbred C57BL Mouse
Bacillus
Animal Models
Acids

ASJC Scopus subject areas

  • Immunology
  • Medicine(all)

Cite this

Airway delivery of silica increases susceptibility to mycobacterial infection in mice : Potential role of repopulating macrophages. / Pasula, Rajamouli; Britigan, Bradley E; Turner, Joanne; Martin, William J.

In: Journal of Immunology, Vol. 182, No. 11, 01.06.2009, p. 7102-7109.

Research output: Contribution to journalArticle

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