The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
Toll-Like Receptor 2-Dependent Inhibition of Macrophage Class II MHC Expression and Antigen Processing by 19-kDa Lipoprotein of Mycobacterium tuberculosis
Abstract
Mycobacterium tuberculosis (MTB) induces vigorous immune responses, yet persists inside macrophages, evading host immunity. MTB bacilli or lysate was found to inhibit macrophage expression of class II MHC (MHC-II) molecules and MHC-II Ag processing. This report characterizes and identifies a specific component of MTB that mediates these inhibitory effects. The inhibitor was extracted from MTB lysate with Triton X-114, isolated by gel electroelution, and identified with Abs to be MTB 19-kDa lipoprotein. Electroelution- or immunoaffinity-purified MTB 19-kDa lipoprotein inhibited MHC-II expression and processing of both soluble Ags and Ag 85B from intact MTB bacilli. Inhibition of MHC-II Ag processing by either MTB bacilli or purified MTB 19-kDa lipoprotein was dependent on Toll-like receptor (TLR) 2 and independent of TLR 4. Synthetic analogs of lipopeptides from Treponema pallidum also inhibited Ag processing. Despite the ability of MTB 19-kDa lipoprotein to activate microbicidal and innate immune functions early in infection, TLR 2-dependent inhibition of MHC-II expression and Ag processing by MTB 19-kDa lipoprotein during later phases of macrophage infection may prevent presentation of MTB Ags and decrease recognition by T cells. This mechanism may allow intracellular MTB to evade immune surveillance and maintain chronic infection.
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Cites
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“Because alternate MHC-I Ag processing in this system (45, 46) depends on MHC-I molecules, phagocytosis, phagolysosomal function, and lysosomal proteases, this finding implies that MTB 19-kDa lipoprotein does not generally inhibit Ag uptake, proteolytic processing, or the expression of MHC-I molecules.”
BackgroundSelf-citation
Cited by
Cell-Mediated Immune Responses in Tuberculosis
Cooper, A. M. (2009) · Annual Review of Immunology · doi:10.1146/annurev.immunol.021908.132703 · Cited by 1,162
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A Novel Host-Parasite Lipid Cross-talk
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Self-citationLatent tuberculosis: mechanisms of host and bacillus that contribute to persistent infection
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Cultured astrocytes express toll‐like receptors for bacterial products
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Immunoevasion and immunosuppression of the macrophage by Mycobacterium tuberculosis
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Metadata
- Authors
- Noss, E. H., Pai, R. K., Sellati, T. J., Radolf, J. D., Belisle, J., Golenbock, D. T., Boom, W. H., & Harding, C. V.
- Venue
- The Journal of Immunology
- Publisher
- Oxford University Press (OUP)
- Published
- 2001-07
- Volume
- 167
- Issue
- 2
- Pages
- 910-918
- ISSN
- 0022-1767 (ISSN-L)
- 1550-6606
- OpenAlex
- W2126245681
- Cited by
- 453
- References
- 3
- FWCI
- 19.52
- Type
- journal article
- Language
- en
- Open access
- closed
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