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Journal of Cell Science, Vol 101, Issue 1 145-150, Copyright © 1992 by Company of Biologists
JOURNAL ARTICLES |
SJ Kennel, V Godfrey, LY Ch'ang, TK Lankford, LJ Foote and A Makkinje
Biology Division, Oak Ridge National Laboratory, TN 37831-8077.
More than 15 subunits of the integrin family of cell surface adhesion molecules have been identified. The alpha 6 beta 4 integrin has recently been identified as a component of hemidesmosomes of stratified squamous epithelium. The monoclonal antibody (mAb) 346-11A binds to the beta 4 subunit in mice. Sequence analysis of a cDNA clone coding for this epitope localizes reaction of the mAb to a portion about half way through the extracellular domain at the beginning of the cysteine-rich region. Sites of beta 4 expression in mice were detected by autoradiographic analysis of tissues collected from mice 24 or 48 h after intravenous injection of 125I-labeled mAb 346-11A. This non-quantitative technique emphasizes detection of antigen exposed in the vascular space. These data show that in addition to the epithelia of several organs, the endothelia of intermediate vessels throughout the body are sites of beta 4 expression. In particular, endothelium of larger vessels but not capillaries in lung, vessels in thymus, spleen and Peyer's patches, and portal vessels but not the central veins of the liver, are positive. The expression of the beta 4 integrin in blood vessels may indicate a specialized function for beta 4 at these sites that is distinct from its role in hemidesmosome-mediated attachment.
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