PMID: 7520892Feb 1, 1994Paper

CD44 variant isoforms are preferentially expressed in basal epithelial of non-malignant human fetal and adult tissues

Histochemistry
H J TerpeU Günthert

Abstract

CD44 is a transmembrane glycoprotein, which can exist in a multitude of isoforms due to alternative splicing of the pre-mRNA. We have generated monoclonal antibodies to several of these variant regions, which are encoded by 10 additional exons in the extracellular part of the molecule. CD44 variant isoforms have been reported to be involved in the malignant progression of rat and human tumours. The precise localization of CD44 variant isoforms in normal developmental and morphogenetic processes is essential for diagnostic studies of human tumorigenesis. Therefore, we have analysed a large number of different human tissues by immunohistochemistry for the expression of CD44 isoforms containing either exons 4v, 6v or 9v. Expression of exon 9v-isoforms was detected in almost all epithelia analysed, with a few exceptions. Exon 6v isoforms are expressed only in squamous and glandular epithelial, e.g. skin epidermis, sweat and sebaceous glands, oesophagus, ducts of the mammary gland, salivary and prostate glands. Detection of exon 4v-encoded isoforms was restricted to the epidermis and the oesophagus. Similar tissue distributions of CD44 variant isoforms were observed in 10-week-old fetal tissues. Since one of the ligands of CD44 is h...Continue Reading

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