title: Expression pattern of MUM1/IRF4 in the spectrum of pathology of Hodgkin's disease.
abstract: Biological and clinical studies have shown that Hodgkin's disease (HD) can be divided into two major categories, termed nodular lymphocyte predominance HD (NLP HD) and classic HD (CHD). Within CHD four subtypes have been distinguished: nodular sclerosis, mixed cellularity, lymphocyte rich and lymphocyte depletion. To refine the histogenesis of the pathological spectrum of HD, 75 CHD and 13 NLP HD were analysed for the expression pattern of MUM1/IRF4 (Multiple Myeloma-1/Interferon Regulatory Factor-4), a lymphocyte-specific member of the IRF family, that is expressed by late centrocytes and post-germinal centre (GC) B cells. MUM1 reacted with Hodgkin's and Reed-Sternberg (HRS) cells of all CHD cases (75/75 cases), with a moderate to strong staining intensity. Conversely, lymphocyte and histiocyte (L & H) cells, the putative tumour cells of NLP HD, were negative for MUM-1 expression (9/13 cases) or displayed a weak reactivity for the antigen in < 10% neoplastic cells (4/13 cases). With respect to HD microenvironment, NLP HD displayed numerous MUM1-positive T lymphocytes located in close proximity to L & H cells whereas, in CHD, MUM1-positive T lymphocytes appeared to be distributed randomly with no specific relationship with HRS cells. Overall, this study shows that MUM1 expression differs in L & H cells versus HRS cells, corroborating the notion that NLP HD and CHD represent different stages of B-cell differentiation. As MUM1-positive T lymphocytes form rosettes around tumour cells of NLP HD, but not of CHD, these data point also to differences in the microenvironment of NLP HD and CHD, and postulate an interactive role of MUM1-positive T lymphocytes with L & H cells.
authors.affiliation: Division of Pathology, Centro di Riferimento Oncologico, IRCCS, Istituto Nazionale Tumori, via Pedemontali Occidentale, Aviano I-33081, Italy. acarbone@cro.it
authors.forename: Antonino
authors.initials: A
authors.lastname: Carbone
authors.forename: Annunziata
authors.initials: A
authors.lastname: Gloghini
authors.forename: Donatella
authors.initials: D
authors.lastname: Aldinucci
authors.forename: Valter
authors.initials: V
authors.lastname: Gattei
authors.forename: Riccardo
authors.initials: R
authors.lastname: Dalla-Favera
authors.forename: Gianluca
authors.initials: G
authors.lastname: Gaidano
mesh_terms: D015496:CD4-Positive T-Lymphocytes / Q000737:chemistry; D023201:CD40 Ligand / Q000032:analysis; D018959:CD57 Antigens / Q000032:analysis; D004268:DNA-Binding Proteins / Q000032:analysis*; D006644:Histiocytes / Q000737:chemistry; D006689:Hodgkin Disease / Q000145:classification* / Q000378:metabolism / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D050835:Interferon Regulatory Factors; D008221:Lymphoid Tissue / Q000737:chemistry; D016539:Reed-Sternberg Cells / Q000737:chemistry*; D013601:T-Lymphocytes / Q000737:chemistry*; D014157:Transcription Factors / Q000032:analysis*; D000099218:Interferon Regulatory Factor-4
chemical_list: D023201:CD40 Ligand; D018959:CD57 Antigens; D004268:DNA-Binding Proteins; D050835:Interferon Regulatory Factors; D014157:Transcription Factors; D000099218:Interferon Regulatory Factor-4