title: Analysis of MUM1/IRF4 protein expression using tissue microarrays and immunohistochemistry.
abstract: The gene encoding MUM1 was characterized as a possible translocation partner in chromosomal abnormalities involving a significant number of multiple myelomas. The overexpression of the MUM1 protein as a result of translocation t(6;14) (p25;q32) identified MUM1 as a putative regulatory molecule involved in B-cell differentiation and tumorigenesis. The expression of MUM1 protein in multiple myelomas supports this hypothesis. In the current study, using tissue microarray technology, we have tested the expression of the MUM1 protein in 1335 human malignancies and normal tissues. Our data show that the MUM1 protein is expressed in a wide spectrum of hematolymphoid neoplasms and in malignant melanomas but is absent in other human tumors. In addition, in tissue microarrays as well as in conventional paraffin sections, MUM1 staining was found to lack specificity in detecting plasmacytic differentiation as compared with two markers, CD138/Syndecan and VS38, commonly used in paraffin immunohistochemistry for detection of plasma cells.
authors.affiliation: Department of Pathology, Stanford University Medical Center, Stanford, California 94305, USA. ynatkunam@yahoo.com
authors.forename: Y
authors.initials: Y
authors.lastname: Natkunam
authors.forename: R A
authors.initials: RA
authors.lastname: Warnke
authors.forename: K
authors.initials: K
authors.lastname: Montgomery
authors.forename: B
authors.initials: B
authors.lastname: Falini
authors.forename: M
authors.initials: M
authors.lastname: van De Rijn
mesh_terms: D000911:Antibodies, Monoclonal / Q000032:analysis; D004268:DNA-Binding Proteins / Q000032:analysis* / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D050835:Interferon Regulatory Factors; D016393:Lymphoma, B-Cell / Q000378:metabolism / Q000473:pathology; D008562:Membrane Glycoproteins / Q000032:analysis; D011509:Proteoglycans / Q000032:analysis; D053668:Syndecan-1; D053667:Syndecans; D014018:Tissue Distribution; D014157:Transcription Factors / Q000032:analysis* / Q000378:metabolism; D000099218:Interferon Regulatory Factor-4
chemical_list: D000911:Antibodies, Monoclonal; D004268:DNA-Binding Proteins; D050835:Interferon Regulatory Factors; D008562:Membrane Glycoproteins; D011509:Proteoglycans; D053668:Syndecan-1; D053667:Syndecans; D014157:Transcription Factors; D000099218:Interferon Regulatory Factor-4; C508241:SDC1 protein, human; C100347:VS38 monoclonal antibody