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The Journal of Immunology, Vol 148, Issue 11 3554-3559, Copyright © 1992 by American Association of Immunologists
ARTICLES |
K Kapasi and RD Inman
Department of Medicine, University of Toronto, Canada.
The mechanism by which HLA-B27 confers genetic susceptibility to the seronegative spondyloarthropathies ankylosing spondylitis, Reiter's syndrome, and reactive arthritis, is not well understood. The current concept of an extraarticular bacterial infection functioning as the triggering event in a genetically susceptible host suggests the possibility of direct microbial-MHC interaction. We have addressed the role of HLA-B27 in microbial-host cell interaction by examining invasion by putatively arthritogenic gram-negative bacteria. Target cells used were murine L cells transfected with HLA-B27, HLA-A3, HLA- A2, HLA B44, HLA B18, or pSV2neo vector alone. Relative to the pSV2neo control and the HLA-A3 transfectant, HLA-B27-transfected cells demonstrated a consistent decrease in invasion for each of the following pathogens: Salmonella typhimurium (45 +/- 2% decrease), Shigella sonnei (53 +/- 13% decrease), Shigella flexneri (45 +/- 5% decrease), and enteroinvasive Escherichia coli (57 +/- 8% decrease). This decrease was specific for the HLA B27-transfected L cells and was not observed in the other B allele transfectants. The decreased invasion in the HLA-B27 transfectants is not the result of either altered endogenous mouse class I expression as a result of human class I transfection or increased intracellular bacterial killing within the B27 transfectants. There was an inverse relationship between the amount of surface expression of HLA-B27, as measured by FACS, and the degree of invasion. Blocking of surface B27 Ag with anti-B27 mAb augmented bacterial invasion in the B27 transfectants. These studies demonstrate a novel bacterial-B27 interaction that may have relevance to the pathogenesis of B27-related arthritis.
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