In vitro and in vivo T cell responses in mice during bronchopulmonary infection with mucoid Pseudomonas aeruginosa - PubMed (original) (raw)
Comparative Study
In vitro and in vivo T cell responses in mice during bronchopulmonary infection with mucoid Pseudomonas aeruginosa
M M Stevenson et al. Clin Exp Immunol. 1995 Jan.
Abstract
In vitro and in vivo T cell responses were determined during the course of bronchopulmonary infection with mucoid Pseudomonas aeruginosa. T cell responses were compared in two inbred mouse strains, namely BALB/c mice, which are resistant to the establishment of chronic bronchopulmonary Ps. aeruginosa infection, and C57Bl/6 mice, which have high numbers of bacteria in the lungs through 14 days post-infection. Unseparated lung cells and lung T cells from BALB/c mice exhibited significantly higher in vitro proliferative responses to both heat-killed Ps. aeruginosa and concanavalin A (Con A) than cells from C57Bl/6 mice through 20 days post-intratracheal infection with 10(4) colony-forming units (CFU) Ps. aeruginosa. Proliferation of unseparated lung cells but not lung T cells from BALB/c mice infected 6 days previously with 10(5) CFU Ps. aeruginosa was suppressed in response to Con A; these cells were unresponsive to specific antigen. Suppression of lymphocyte proliferation in the lungs of C57Bl/6 mice infected with 10(4) CFU Ps. aeruginosa and in BALB/c mice infected with 10(5) CFU was found to be mediated by adherent lung cells via the production of nitric oxide and prostaglandins. Determination of in vivo T cell-mediated responses in infected mice demonstrated that resistant BALB/c mice had high DTH and low Pseudomonas-specific antibody responses, while C57Bl/6 mice had low DTH and high antibody levels, in particular, IgG2b and IgM.
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