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Macrophage-T cell interaction in experimental mycobacterial infection. Selective regulation of co-stimulatory molecules on Mycobacterium-infected macrophages and its implication in the suppression of cell-mediated immune response.

DIR@IMTECH: CSIR-Institute of Microbial Technology

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Title Macrophage-T cell interaction in experimental mycobacterial infection. Selective regulation of co-stimulatory molecules on Mycobacterium-infected macrophages and its implication in the suppression of cell-mediated immune response.
 
Creator Saha, B
Das, G
Vohra, H
Ganguly, N K
Mishra, G C
 
Subject QR180 Immunology
 
Description The most important immunopathological consequence of experimental mycobacterial infection is the suppression of T cell-mediated immune response to both mitogens and mycobacterial antigens. We registered that there was decreased concanavalin A-induced spleen cell proliferation in infected susceptible BALB/c mice as compared to normal mice. In resistant (C3H/HeJ) mice, infection with the bacteria did not induce any suppression in the mitogen-induced lymphoproliferation. Likewise, delayed-type hypersensitivity (DTH) responses, to keyhole limpet hemocyanin and mycobacterial crude soluble antigen were suppressed in infected BALB/c mice but not in C3H/HeJ mice. This depressed T helper cell function may either be due to defective T cell-receptor occupancy by antigen-Ia complex or altered co-stimulatory signals provided by antigen-presenting cells. In the present study, we have investigated the status of certain co-stimulatory molecules on the infected macrophages from both susceptible and resistant mice. Our results demonstrate that upon mycobacterial infection, the macrophages are rendered incapable of delivering the co-stimulatory signals to T helper cells, possibly due to the involvement of prostaglandin, as inhibition of its biosynthesis by indomethacin reversed the defect. Furthermore, the selective regulation was bacteria-induced as killing of the bacteria by rifampicin abrogated the derangements in the expression of co-stimulatory molecules on the Mycobacterium-infected macrophages. Our observations revealed that upon infection with Mycobacterium tuberculosis, B7 was down-regulated while ICAM-1 was increased only in BALB/c but not in C3H/HeJ mice. Expression of VCAM-1 did not change during the infection in either strain of mice. We found that these changes in ICAM-1 and B7 expression on the surface of infected macrophages resulted in inhibition of DTH-mediating functions of T helper cells from BALB/c mice. The results obtained in this study describe not only a novel immune evasion strategy adopted by Mycobacterium, but also open up the possibility of immunotherapy of mycobacterial infection by selective manipulation of co-stimulatory molecules.
 
Publisher Wiley
 
Date 1994-11
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://crdd.osdd.net/open/404/1/mishra1994.pdf
Saha, B and Das, G and Vohra, H and Ganguly, N K and Mishra, G C (1994) Macrophage-T cell interaction in experimental mycobacterial infection. Selective regulation of co-stimulatory molecules on Mycobacterium-infected macrophages and its implication in the suppression of cell-mediated immune response. European journal of immunology, 24 (11). pp. 2618-24. ISSN 0014-2980
 
Relation http://onlinelibrary.wiley.com/doi/10.1002/eji.1830241108/abstract
http://crdd.osdd.net/open/404/