Bcl2-negative follicular lymphomas frequently have Bcl6 translocation and/or Bcl6 or p53 expression.
Bcl2 is an important protein involved in the pathogenesis of follicular lymphoma (FL). However, approximately 10% of FL cases do not express Bcl2. The present study was designed to compare gene aberrations, prosurvival gene expression, apoptosis and proliferation rates in Bcl2-positive and -negative FL cases. Bcl2 translocation and Bcl6 translocation were detected and compared using fluorescence in situ hybridization (FISH). A tendency for Bcl6 translocation to occur was found more frequently in Bcl2-negative FL than in the Bcl2-positive cases. The expression of Bcl-X, BAX, p53, Bcl6 was analyzed by immunohistochemistry. Bcl2 family proteins Bcl-X and BAX were expressed similarly in the two FL types. In some cases of Bcl2-negative FL there was high expression of Bcl6 or p53 but no such Bcl2-positive FL cases were detected. Furthermore, there was an inverse relationship between the expression of Bcl6 and p53. These results indicate that the Bcl6 translocation occurs more frequently in Bcl2-negative FL. Furthermore, other prosurvival proteins such as p53 and Bcl6 may play an important role in the pathogenesis of Bcl2-negative FL.
Guo
Ying
Y
Department of Pathology, School of Medicine, Fukuoka University, Fukuoka, Japan.
Karube
Kennosuke
K
Kawano
Riko
R
Suzumiya
Junji
J
Takeshita
Morishige
M
Kikuchi
Masahiro
M
Huang
Gao-Sheng
GS
Li
Qing
Q
Ohshima
Koichi
K
D017209:Apoptosis; D014408:Biomarkers, Tumor / Q000378:metabolism; D049109:Cell Proliferation; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007124:Immunoenzyme Techniques; D017404:In Situ Hybridization, Fluorescence; D008198:Lymph Nodes / Q000378:metabolism / Q000473:pathology; D008224:Lymphoma, Follicular / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics* / Q000378:metabolism; D051560:Proto-Oncogene Proteins c-bcl-6; D014178:Translocation, Genetic; D016159:Tumor Suppressor Protein p53 / Q000235:genetics* / Q000378:metabolism; D051028:bcl-2-Associated X Protein / Q000378:metabolism; D051020:bcl-X Protein / Q000378:metabolism
C084103:BCL6 protein, human; D014408:Biomarkers, Tumor; D004268:DNA-Binding Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D051560:Proto-Oncogene Proteins c-bcl-6; D016159:Tumor Suppressor Protein p53; D051028:bcl-2-Associated X Protein; D051020:bcl-X Protein