Cleavage of BP180, a 180-kDa bullous pemphigoid antigen, yields a 120-kDa collagenous extracellular polypeptide.

The Journal of Biological Chemistry
Y HirakoK Owaribe

Abstract

The hemidesmosome (HD) is a cell-to-substrate adhesion apparatus found in stratified and complex epithelia. One of the putative cell-matrix adhesion molecules present in the HD is the 180-kDa bullous pemphigoid antigen (BP180), also termed type XVII collagen. In our previous study, using a monoclonal antibody (mAb) 1337, we have detected a 120-kDa collagenase-sensitive polypeptide in the HD fraction (Uematsu, J. and Owaribe, K. (1993) Cell Struct. Funct. 18, 588 (abstr.)). The present study was undertaken to assess the relation of the 120-kDa polypeptide to this BP180. Immunofluorescence microscopy of bovine skin revealed the basement membrane zone of skin to be stained clearly with mAb 1337, whereas the lateral surfaces of basal cells, which were decorated by typical antibodies against BP180, were not. The antibody did not detect HDs in cultured cells but rather in the culture medium. These results indicate a localization of mAb 1337 antigen distinct from BP180. However, the same polypeptide was also recognized by monoclonal antibodies to the extracellular but not the cytoplasmic part of BP180, and found to react with a polyclonal antibody against the non-collagenous 16A domain of BP180. Therefore, the polypeptide was identifi...Continue Reading

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Citations

Dec 5, 1998·Microscopy Research and Technique·Y Hirako, K Owaribe
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