Bcl-x rather than Bcl-2 mediates CD40-dependent centrocyte survival in the germinal center.
Bcl-x rather than Bcl-2 mediates CD40-dependent centrocyte survival in the germinal center.
复制标题
Bcl-x 而不是 Bcl-2 介导生发中心 CD40 依赖性中心细胞的存活。
作者:
Joseph Tuscano;Kirk M. Druey;Agostino Riva;John Pena;Craig B. Thompson;J. Kehrl
Both rapid B-cell proliferation and programmed cell death (PCD) occur during the differentiation and selection of B cells within the germinal center. To help elucidate the role of Bcl-x in B-cell antigen selection and PCD within the germinal center, we examined its expression in defined B-cell populations and by immunochemistry of tonsil tissue. Purified B-cell fractions enriched for centrocytes express high amounts of Bcl-x and relatively low amounts of Bcl-2, whereas fractions enriched for centroblasts lack significant levels of both proteins. Consistent with this observation, immunocytochemistry localized Bcl-x within cells scattered throughout the germinal center. Stimulation of tonsil B cells with either CD40 or Staphylococcus aureus Cowan increase bcl-x mRNA and protein levels. Treatment of a cell line with a germinal center phenotype (RAMOS) or the tonsillar B-cell centroblast fraction with CD40 rapidly increased Bcl-x levels and partially rescued B cells from PCD. These data suggest that Bcl-x rather than Bcl-2 may rescue centrocytes during selection in the germinal center.
DOI:
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发表时间:
1995
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Wang,Z;Karras,JG;Howard,RG;Rothstein,TL
通讯作者:
Rothstein,TL
DOI:
--
发表时间:
1994
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Fang,W;Rivard,JJ;Mueller,DL;Behrens,TW
通讯作者:
Behrens,TW
DOI:
10.1073/pnas.91.9.3700
发表时间:
1994-04-26
影响因子:
11.1
作者:
NAKAYAMA, K;NAKAYAMA, K;LOH, DY
通讯作者:
LOH, DY