Linked Life Data

12673672

Source:http://linkedlifedata.com/resource/pubmed/id/12673672

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pubmed-article:12673672pubmed:abstractTextDMBT1 and galectin-3 are potential interacting proteins with presumably complex roles in tumorigenesis. While at present a variety of mechanisms are discussed for DMBT1 and its participation in cancer, galectin-3 is commonly known to exert tumor-promoting effects. However, in vitro studies in a rodent system have suggested that DMBT1/galectin-3 interaction in the ECM triggers epithelial differentiation, which would point to tumor-suppressive properties. To improve the understanding of DMBT1/galectin-3 action in cancer, we carried out studies in skin cancer of different origins. Mutational analyses of DMBT1 identified a missense mutation in 1 of 13 melanoma cell lines. It led to an exchange of an evolutionary conserved proline residue for serine and located within the second CUB domain of DMBT1. Immunohistochemical analyses demonstrated absence of DMBT1/galectin-3 expression from melanocytes but induction of DMBT1 expression in 1 of 8 nevi and 1 of 11 melanomas and of galectin-3 expression in 3 of 8 nevi and 4 of 8 melanomas. These data suggest that DMBT1 and galectin-3 are unlikely to act as classical tumor suppressors in melanomas. DMBT1 and galectin-3 appear to be secreted to the ECM by epithelial cells within the epidermis and the hair follicle. Compared to the flanking normal epidermis, skin tumors of epithelial origin frequently displayed downregulation of DMBT1 (18 of 19 cases) and galectin-3 (12 of 12 cases). Thus, loss of DMBT1/galectin-3 expression may play a role in the genesis of epithelial skin cancer. This would support the view that galectin-3 can exert tumor-suppressive effects in certain scenarios, and DMBT1/galectin-3-mediated differentiation represents a candidate mechanism for this effect.lld:pubmed
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pubmed-article:12673672pubmed:copyrightInfoCopyright 2003 Wiley-Liss, Inc.lld:pubmed
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pubmed-article:12673672pubmed:articleTitleFrequent downregulation of DMBT1 and galectin-3 in epithelial skin cancer.lld:pubmed
pubmed-article:12673672pubmed:affiliationDepartment of Molecular Genome Analysis, Deutsches Krebsforschungszentrum, Heidelberg, Germany. j.mollenhauer@dfkz.delld:pubmed
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