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Molecular Biology and Genetics |
Department of Molecular Genome Analysis, Deutsches Krebsforschungszentrum, 69120 Heidelberg, Germany [J. M., S. H., I. K., F. B., S. W., A. P.]; Immunology and Microbiology, Institute for Medical Biology, University of Southern Denmark, Odense University, 5000 Odense C, Denmark [U. H.]; Institute for Pathology, Neuropathology, Basel University, 4003 Basel, Switzerland [M. T.]; Molecular Neuro-Oncology, University Hospital, 4031 Basel, Switzerland [A. M., D. M.]; Department of Pathology, University of Southern Denmark, Odense University, 5000 Odense C, Denmark [H. D. S.]; and Department of Experimental Pathology, Deutsches Krebsforschungszentrum, 69120 Heidelberg, Germany [H-J. G.]
The gene deleted in malignant brain tumors 1 (DMBT1) has been proposed as a candidate tumor suppressor for brain, gastrointestinal, and lung cancer. It codes for a protein of unknown function belonging to the superfamily of scavenger receptor cysteine-rich proteins. We aimed at getting insights into the functions of DMBT1 by expression analyses and studies with a monoclonal antibody against the protein. The DMBT1 mRNA is expressed throughout the immune system, and Western blot studies demonstrated that isoforms of DMBT1 are identical to the collectin-binding protein gp-340, a glycoprotein that is involved in the respiratory immune defense. Immunohistochemical analyses revealed that DMBT1 is produced by both tumor-associated macrophages and tumor cells and that it is deregulated in glioblastoma multiforme in comparison to normal brain tissue. Our data further suggest that the proteins CRP-ductin and hensin, both of which have been implicated in epithelial differentiation, are the DMBT1 orthologs in mice and rabbits, respectively. These findings and the spatial and temporal distribution of DMBT1 in fetal and adult epithelia suggest that DMBT1 further plays a role in epithelial development. Rearrangements of DMBT1 were found in 16 of 18 tumor cell lines, and hemizygous deletions were observed in a subset of normal individuals, indicating that the alterations in tumors may be a result of both pre-existing deletions uncovered by a loss of heterozygosity and secondary changes acquired during tumorigenesis. Thus, DMBT1 is a gene that is highly unstable in cancer and encodes for a protein with at least two different functions, one in the immune defense and a second one in epithelial differentiation.
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