Expression of the ''skin-type'' desmosomal cadherin DSC1 is closely linked to the keratinization of epithelial tissues during mouse development

JOURNAL OF INVESTIGATIVE DERMATOLOGY

卷:107

Article

关键词: desmosome;    desmocollin;    desmoglein;   

DOI  :  10.1111/1523-1747.ep12582790

来源: Elsevier

【 摘 要 】

Desmosomal junctions contain two classes of desmosomal cadherin, the desmocollins and the desmogleins, each of which occurs as three distinct isoforms. To investigate the role of the ''skin-type'' desmosomal cadherins (desmocollin 1 and desmoglein 1) in the formation of keratinized epithelial structures, we have now cloned full-length mouse desmocollin 1 complementary deoxyribonucleic acid and examined the expression of desmocollin 1 and desmoglein 1 and messages during murine embryonic development by in situ hybridization. In the general body epidermis, desmocollin 1 and desmoglein 1 transcripts both showed considerable upregulation at 15.5 d, which is after the onset of stratification and before the start of keratinization. Before this the epidermis expressed low levels of desmocollin 1 message, although the desmoglein 1 signal was always stronger and more extensive. In the tongue, expression of desmocollin 1 message occurred several days after desmoglein 1 and coincided with the formation of the keratinizing filiform papillae. Desmoglein 1 message was also detected in epithelial tissues in which desmocollin 1 was absent, suggesting that expression of the two ''skin-type'' desmosomal cadherins was not tightly coupled during embryonic development. Human desmocollin 1 monoclonal antibodies that cross-reacted with mouse shin and tongue indicated that desmocollin 1 protein was first expressed in those outermost epithelial cells destined to form the keratinized layers of the stratum corneum or the papillae. The results suggest that expression of desmocollin 1 is closely associated with the keratinization of epithelial tissues during mouse development.

【 授权许可】

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