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Journal of Cell Science, Vol 107, Issue 11 3183-3190, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
LM Milstone, L Hough-Monroe, LC Kugelman, JR Bender and JG Haggerty
Department of Dermatology, Yale University School of Medicine, New Haven, CT 06510.
Epican is a heparan/chondroitin sulfate proteoglycan form of CD44 and is expressed on the surface of keratinocytes from the basal layer to the granular layer of the epidermis. To analyze the adhesive properties of epican apart from the influence of other adhesive molecules found on keratinocytes, mouse L cell fibroblasts were transfected with CD44Epican cDNA. The epican expressed on the surface of transfected L cells was predominantly a heparan or chondroitin sulfate proteoglycan. The CD44Epican-transfected L cells acquired: (a) a self-aggregating phenotype that required hyaluronan but was calcium-independent; and (b) a new capacity to adhere to keratinocytes, a property that was blocked by an anti-epican antibody. Both aggregation and adhesion of CD44Epican-transfected cells were completely prevented by pretreatment with hyaluronidase, but were totally restored by the addition of exogenous hyaluronan. Aggregation of transfected L cells was minimally influenced by other glycosaminoglycans, but adhesion of transfected L cells to keratinocytes was substantially inhibited by heparin.
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