title: Expression of LAZ3/BCL6 in follicular center (FC) B cells of reactive lymph nodes and FC-derived non-Hodgkin lymphomas.
abstract: Chromosomal translocation resulting in abnormal expression of the LAZ3/BCL6 gene in B cells has been implicated in the tumorigenesis of non-Hodgkin lymphoma (NHL). Therefore we studied the expression pattern of LAZ3/BCL6 by in situ hybridization with synthetic oligonucleotide probes in frozen tissue sections from five reactive lymph nodes and 38 B cell and non-B NHL. In addition, we investigated the expression of LAZ3/BCL6 by Northern blot analysis on multiple human tissues. The LAZ3/BCL6 transcript was found in a variety of tissues, including skeletal muscle, peripheral blood leukocytes, and weakly in normal lymph nodes. In the tumor samples, expression of LAZ3/BCL6 was observed in 68% of all B cell NHL and none of the non-B lymphomas. All cases of follicular, mixed small and large cell lymphomas showed LAZ3/BCL6 expression confined to the neoplastic follicles. A follicular expression pattern was also found in all non-malignant reactive lymph nodes. Hence, the expression of LAZ3/BCL6 does not correlate to malignancy, but reflects the origin of B cells from the germinal centers.
authors.affiliation: Department of Molecular Medicine, Karolinska Hospital, Stockholm, Sweden.
authors.forename: S
authors.initials: S
authors.lastname: Bajalica-Lagercrantz
authors.forename: F
authors.initials: F
authors.lastname: Piehl
authors.forename: J
authors.initials: J
authors.lastname: Lagercrantz
authors.forename: J
authors.initials: J
authors.lastname: Lindahl
authors.forename: G
authors.initials: G
authors.lastname: Weber
authors.forename: J P
authors.initials: JP
authors.lastname: Kerckeart
authors.forename: A
authors.initials: A
authors.lastname: Porwit-MacDonald
authors.forename: M
authors.initials: M
authors.lastname: Nordenskjöld
mesh_terms: D001402:B-Lymphocytes / Q000378:metabolism*; D001706:Biopsy; D015152:Blotting, Northern; D004268:DNA-Binding Proteins / Q000378:metabolism*; D015870:Gene Expression; D006801:Humans; D017403:In Situ Hybridization; D008198:Lymph Nodes / Q000378:metabolism*; D008228:Lymphoma, Non-Hodgkin / Q000235:genetics / Q000276:immunology*; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D051560:Proto-Oncogene Proteins c-bcl-6; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: C084103:BCL6 protein, human; D004268:DNA-Binding Proteins; D011518:Proto-Oncogene Proteins; D051560:Proto-Oncogene Proteins c-bcl-6; D014157:Transcription Factors