Human B cell precursors proliferate and express CD23 after CD40 ligation

Human B cell precursors proliferate and express CD23 after CD40 ligation
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CD40 连接后人类 B 细胞前体增殖并表达 CD23

DOI:
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发表时间:
1993
影响因子:
15.3
通讯作者:
J. Banchereau
J. Banchereau
中科院分区:
医学1区
文献类型:
--
作者:
S. Saeland;rie Duver;I. Moreau;J. Banchereau

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CD 40表面膜分子在成熟人B细胞的活化中起重要作用,但其在B谱系发育的早期阶段中的作用尚不清楚。在此,我们研究了通过与Fc γ受体II型转染的鼠Ltk-细胞(CD 40系统)呈递的抗CD 40抗体交联来触发CD 40抗原对B细胞前体(BCP)的影响。CD 10+表面免疫球蛋白阴性(sIg-)BCP,新鲜分离的胎儿骨髓或预培养的基质细胞,增殖的CD 40系统。这种效应需要IL-3的存在,IL-3在一组细胞因子中作为一种特异性的共同信号。IL-10和IL-7的联合增强了观察到的IL-3和CD 40依赖性BCP增殖,表明IL-10可以作用于早期B谱系细胞。胎儿BCP的CD 40依赖性激活不利于sIg+ B细胞的成熟,但导致高水平的表面膜CD 23的诱导。新出现的CD 23 + BCP缺乏sIg和CD 10,并代表了CD 40依赖性培养物中循环细胞的重要比例。综上所述,我们的数据表明,刺激的CD 40抗原诱导的CD 23基因的表达,并调节细胞增殖过程中正常的人B细胞个体发育。
The CD40 surface membrane molecule plays an important role in the activation of mature human B cells, but its role in earlier stages of B lineage development is unknown. Here, we have investigated the effects of triggering the CD40 antigen on B cell precursors (BCP) by crosslinking with anti-CD40 antibody presented by Fc gamma-receptor type II-transfected murine Ltk- cells (CD40 system). CD10+ surface immunoglobulin negative (sIg-) BCP, freshly isolated from fetal bone marrow or precultured on stromal cells, proliferated in the CD40 system. This effect required the presence of IL-3, which acted as a specific cosignal among a panel of cytokines examined. The association of IL-10 and IL-7 potentiated the observed IL-3 and CD40-dependent BCP proliferation, demonstrating that IL-10 can act on early B lineage cells. CD40-dependent activation of fetal BCP did not favor maturation to sIg+ B cells, but resulted in the induction of high levels of surface membrane CD23. The emerging CD23+ BCP lacked sIg and CD10, and represented an important proportion of the cycling cells in the CD40- dependent cultures. Taken together, our data demonstrate that stimulation of the CD40 antigen induces expression of the CD23 gene, and regulates cell proliferation during normal human B cell ontogeny.
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