JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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Rabbits immunized with a peptide encoded for by the 230-kD bullous pemphigoid antigen cDNA develop an enhanced inflammatory response to UVB irradiation: a potential animal model for bullous pemphigoid.

Previous attempts to develop an animal model of bullous pemphigoid (BP) have failed to result in inflammatory disease in the skin. P1-2 is an 18-amino acid peptide encoded for by the 230-kD BP antigen cDNA that has been shown to contain an epitope recognized by circulating antibodies from patients with BP. The purpose of this study was to determine if ultraviolet B irradiation of rabbits after immunization with the P1-2 peptide would result in an enhanced inflammatory response in the skin to that injury. Three rabbits were immunized with either P1-2 or a control peptide. All rabbits immunized with P1-2, and none of the control rabbits, developed antibodies against P1-2 that bound in vitro to both human and rabbit skin in a linear pattern at the basement membrane zone. Immunized rabbits were irradiated on the flank with ultraviolet light. Rabbits immunized with P1-2 developed an enhanced inflammatory reaction to ultraviolet B irradiation leading to epidermal necrosis and sloughing of some sites in 6-9 d. Control rabbits showed only mild erythema without sloughing, which healed in 4-6 d. Histology in the P1-2 immunized rabbits at 24 h revealed an inflammatory infiltrate of neutrophils at the dermal-epidermal junction, whereas control rabbits showed only mild edema and a sparse inflammatory infiltrate. All the rabbits immunized with P1-2 had linear deposits of immunoglobulin G and C3 at the basement membrane zone of healed skin compared to none of the controls. These findings demonstrate that antibodies against a synthetic peptide encoded by the BP antigen 1 sequence can lead to an enhanced inflammatory response after epithelial injury in rabbit skin.

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