title: Biased VH family usage in primary gastric B cell lymphoma of mucosa-associated lymphoid tissue-type and the selected V beta expression of T cells infiltrating into the lymphoma cells.
abstract: Seven cases of primary gastric low-grade B cell lymphoma of mucosa-associated lymphoid tissue (MALT) type, two cases of high-grade B cell lymphoma with a low-grade component and three cases of pure high-grade lymphoma were selected for the current study. The Ig VH gene use of lymphoma cells and the V beta repertoires of infiltrating T cells were investigated. The VH gene analysis showed multiple VH family usage in 12 cases, but the MALT-type lymphoma cell usage was found to be biased for the families that have a low number of VH genes (VHIV and V). Another analysis of lymphoma-infiltrating T cells showed restricted expressions of the V beta repertoire in all seven low-grade cases and three high-grade cases. In those 10 cases, a considerable number of CD4-positive T cells infiltrated into lymphoma cells and RAG-1 was also prominently expressed. Based on these findings, it was thus assumed that the normal counterpart of gastric B cell lymphoma of MALT type is different from the conventional B cell lymphoma, and the restricted expression of V beta repertoires is therefore considered to be a characteristic finding in low-grade B cell lymphomas of MALT type as well as in a proportion of high-grade lymphomas (the so called 'high-grade lymphoma of MALT type').
authors.affiliation: First Department of Pathology, School of Medicine, Fukuoka University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shibata
authors.forename: K
authors.initials: K
authors.lastname: Ohshima
authors.forename: M
authors.initials: M
authors.lastname: Kikuchi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017931:DNA Primers / Q000737:chemistry; D005260:Female; D005803:Genes, Immunoglobulin; D018398:Homeodomain Proteins; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics / Q000276:immunology*; D007150:Immunohistochemistry; D016246:Lymphocytes, Tumor-Infiltrating / Q000276:immunology*; D018442:Lymphoma, B-Cell, Marginal Zone / Q000276:immunology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000096:biosynthesis; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000096:biosynthesis*; D013274:Stomach Neoplasms / Q000276:immunology* / Q000473:pathology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D017931:DNA Primers; D018398:Homeodomain Proteins; D007143:Immunoglobulin Heavy Chains; D012333:RNA, Messenger; D016693:Receptors, Antigen, T-Cell, alpha-beta; C064658:RAG-1 protein