Antibodies to mycobacterial 65-kDa heat shock protein and other immunodominant antigens in patients with psoriasis - PubMed (original) (raw)
Antibodies to mycobacterial 65-kDa heat shock protein and other immunodominant antigens in patients with psoriasis
A Rambukkana et al. J Invest Dermatol. 1993 Jan.
Free article
Abstract
An association of microbial agents and autoimmunity has been suggested for the pathogenesis of psoriasis. Mycobacteria are common environmental microbes and their antigens, especially the highly conserved mycobacterial 65-kDa heat shock protein (hps65), have been implicated in the pathogenesis of autoimmune arthritis and other idiopathic diseases. In this context, we investigated a possible mycobacterium-induced humoral immune response in psoriasis. Sera from 17 patients with chronic plaque-type psoriasis were studied by immunoblotting using the whole sonicate of Mycobacterium tuberculosis and purified recombinant mycobacterial hsp65. Immunoblot analysis demonstrated that 58% of the psoriasis patients compared to patients with acne and DLE, and normal controls showed strong antibody activity to 65-kDa and 48/45 doublet antigens from M. tuberculosis sonicate, whereas 47% of the patients showed antibody activity to mycobacterial hsp65. Only 10-20% of the patients had an antibody response to 16-kDa and 80-kDa antigens. Similar antibody activity to 65 kDa and 48/45 kDa was also found consistently with eight different sonicated mycobacterial species by immunoblotting, indicating that these seroreactive antigens are crossreactive and are present in common environmental mycobacteria. Antibody activities to both mycobacterial 65-kDa and hsp65 showed a positive correlation (r = 0.76) with the psoriasis disease activity, whereas antibodies to 48/45-kDa doublet antigens showed a weak correlation (r = 0.54). By enzyme-linked immunosorbent assay (ELISA), 47% of the psoriasis patients showed significantly elevated antibody titers to hsp65 (p < 0.003) as compared to control groups, and the antibody response by ELISA also showed a significant positive correlation (r = 0.76) with disease activity. Anti-mycobacterial antibody activity may be related to severity of disease and may be useful in monitoring disease activity in psoriasis.
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