title: Expression of intracellular signaling molecules in classical and lymphocyte predominance Hodgkin disease.
abstract: The neoplastic cells in classical Hodgkin disease (Reed-Sternberg cells) are of B-lymphoid origin, but they lack many markers of this cell lineage, for example, immunoglobulin, CD20, and B-cell-associated transcription factors. In contrast, the neoplastic cells ("L&H" cells) in lymphocyte predominance Hodgkin disease retain the molecular profile of germinal center B cells. In this paper, we investigated the expression in Hodgkin disease (45 cases and 3 cell lines) of 5 intracellular signaling molecules found in B cells. The Src family kinase Syk, the B-cell adaptor protein BLNK, and phospholipase C (PLC)-gamma2 were consistently absent from Reed-Sternberg cells, whereas 2 other Src kinases (Lyn and Fyn) were heterogeneously expressed in a proportion of cases (12% and 42%, respectively). In contrast, the tumor cells in all cases of lymphocyte predominance Hodgkin disease were positive for Fyn, Syk, BLNK, and PLC-gamma2, and Lyn immunostaining was seen in a minority of biopsies. These results indicate that in Reed-Sternberg cells, the defect in B-cell lineage marker expression includes a spectrum of molecules involved in intracellular signaling, a finding in keeping with recent gene expression profiling studies. Furthermore, the clear difference in expression of signaling proteins between the 2 major subtypes of Hodgkin disease may be of diagnostic value.
authors.affiliation: Nuffield Department of Clinical Laboratory Sciences, John Radcliffe Hospital, Oxford, United Kingdom. teresa.marafioti@ndcls.ox.ac.uk
authors.forename: Teresa
authors.initials: T
authors.lastname: Marafioti
authors.forename: Michela
authors.initials: M
authors.lastname: Pozzobon
authors.forename: Martin-Leo
authors.initials: ML
authors.lastname: Hansmann
authors.forename: Georges
authors.initials: G
authors.lastname: Delsol
authors.forename: Stefano A
authors.initials: SA
authors.lastname: Pileri
authors.forename: David Y
authors.initials: DY
authors.lastname: Mason
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D002352:Carrier Proteins / Q000378:metabolism; D045744:Cell Line, Tumor; D004792:Enzyme Precursors / Q000378:metabolism; D006689:Hodgkin Disease / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D007424:Intracellular Fluid / Q000276:immunology / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D051966:Phospholipase C gamma; D010750:Phosphoproteins / Q000378:metabolism; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D051076:Proto-Oncogene Proteins c-fyn; D015398:Signal Transduction; D000072377:Syk Kinase; D010738:Type C Phospholipases / Q000378:metabolism; D019061:src-Family Kinases / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C113939:B cell linker protein; D002352:Carrier Proteins; D004792:Enzyme Precursors; D047908:Intracellular Signaling Peptides and Proteins; D010750:Phosphoproteins; D011518:Proto-Oncogene Proteins; D011505:Protein-Tyrosine Kinases; C494957:FYN protein, human; D051076:Proto-Oncogene Proteins c-fyn; C000606896:SYK protein, human; D000072377:Syk Kinase; C060902:lyn protein-tyrosine kinase; D019061:src-Family Kinases; D010738:Type C Phospholipases; D051966:Phospholipase C gamma