Abstract
The intracellular growth kinetics ofMycobacterium avium and H37Rv (virulent) and H37Ra (avirulent) strains ofMycobacterium tuberculosis were compared by use of both the professional (mouse bone marrow-derived macrophages, BMMØ) and nonprofessional (mouse L-929 fibroblast cell line) phagocytes. The results obtained showed that all the mycobacterial strains grew more actively in fibroblasts than in BMMØ. This difference was paralleled by lesser acid phosphatase (AcP) labeling of noninfected fibroblasts and the observation that upon infection both the proportion of AcP-positive cells and AcP content were higher in BMMØ than in L-cells during the 7 days of infection. In parallel experiments, intracellular growth ofM. tuberculosis H37Rv andM. avium was compared inside BMMØ from both theBcg s (C57BL/6) andBcg r (DBA-2) mice, which were matured and differentiated with either an L-cell-conditioned medium (LCM) obtained from control, noninfected L-929 cells, or a LCM obtained withM. tuberculosis-orM. avium-infected L-cells. Upon mycobacterial infection, fibroblasts were able to secrete mediators that stimulated the BMMØ to better control the infection by pathogenic mycobacteria. These results are discussed in terms of the mycobacteria-fibroblast interactions and their eventual role in the immune modulation of the host's response to invading mycobacteria.
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Rastogi, N., Labrousse, V. & de Sousa, J.P.C. Mycobacterial growth and ultrastructure in mouse L-929 fibroblasts and bone marrow-derived macrophages: Evidence that infected fibroblasts secrete mediators capable of modulating bacterial growth in macrophages. Current Microbiology 25, 203–213 (1992). https://doi.org/10.1007/BF01570720
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DOI: https://doi.org/10.1007/BF01570720