PMID: 9529088Apr 7, 1998Paper

Human mannose-binding protein inhibits infection of HeLa cells by Chlamydia trachomatis

Infection and Immunity
A F SwansonC Kuo

Abstract

The role that collectin (mannose-binding protein) may play in the host's defense against chlamydial infection was investigated. Recombinant human mannose-binding protein was used in the inhibition of cell culture infection by Chlamydia trachomatis (C/TW-3/OT, E/UW-5/Cx, and L2/434/Bu), Chlamydia pneumoniae (AR-39), and Chlamydia psittaci (6BC). Mannose-binding protein (MBP) inhibited infection of all chlamydial strains by at least 50% at 0.098 microg/ml for TW-3 and UW-5, and at 6.25 microg/ml for 434, AR-39, and 6BC. The ability of MBP to inhibit infection with strain L2 was not affected by supplementation with complement or addition of an L2-specific neutralizing monoclonal antibody. Enzyme-linked immunosorbent assay and dot blot analyses showed MBP bound to the surface of the organism to exert inhibition, which appeared to block the attachment of radiolabeled organisms to HeLa cells. Immunoblotting and affinity chromatography indicated that MBP binds to the 40-kDa glycoprotein (the major outer membrane protein) on the outer surface of the chlamydial elementary body. Hapten inhibition assays with monosaccharides and defined oligosaccharides showed that the inhibitory effects of MBP were abrogated by mannose or high-mannose ty...Continue Reading

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Citations

Apr 9, 2002·The Journal of Immunology : Official Journal of the American Association of Immunologists·Sunita GulatiSanjay Ram
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