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Dermatitis herpetiformis: biochemical properties of the granular deposits of IgA in papillary dermis. Characterization of SDS-soluble IgA-like material and potentially antigen-binding IgA fragments released by pepsin.

Granular deposits of IgA in radioactively labeled thin slices of papillary dermis from 4-mm punch biopsies of clinically normal skin from patients with dermatitis herpetiformis were solubilized with sodium dodecyl sulfate (SDS) or peptic digestion at pH 4. 5. Solubilized IgA-like material was isolated by immunoprecipitation and analyzed by electrophoresis in one and two dimensions in polyacrylamide gels containing SDS followed by autoradiography. SDS extracts contained IgA-like components corresponding to monomers, dimers, as well as higher polymers of IgA. A fraction of the SDS-soluble material behaved like IgA upon immunoprecipitation but could not be deaggregated to alpha- and light chains by reduction and alkylation, suggesting that it was present as irreversible aggregates with itself or with other proteins. Peptic digestion at pH 4.5 released fragments which were precipitated by antibodies to human alpha-chains and had molecular weights similar to the proteolytic fragments corresponding to F(ab)2 and Fab formed by peptic digestion of human monomeric IgA under the same conditions.[1]

References

  1. Dermatitis herpetiformis: biochemical properties of the granular deposits of IgA in papillary dermis. Characterization of SDS-soluble IgA-like material and potentially antigen-binding IgA fragments released by pepsin. Egelrud, T., Bäck, O. J. Invest. Dermatol. (1985) [Pubmed]
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