Expression of bcl-X(L) restores cell survival, but not proliferation off effector differentiation, in CD28-deficient T lymphocytes.

Expression of bcl-X(L) restores cell survival, but not proliferation off effector differentiation, in CD28-deficient T lymphocytes.
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DOI:
10.1084/jem.191.12.2031
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发表时间:
2000-06-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Abbas AK
Abbas AK
中科院分区:
其他
文献类型:
--
作者:
Dahl AM;Klein C;Andres PG;London CA;Lodge MP;Mulligan RC;Abbas AK

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缺乏T细胞共刺激分子CD 28的淋巴细胞在细胞存活、克隆扩增和分化成效应细胞方面表现出缺陷。已知CD 28介导的信号传导导致Bcl家族成员Bcl-XL的上调。为了研究Bcl-XL在CD 28的各种功能中所起的作用,我们使用逆转录病毒介导的基因转移在CD 28缺陷的原代T淋巴细胞中表达Bcl-XL。T细胞在体外被激活,并用Bcl-XL或对照逆转录病毒感染;这种方法允许在激活的循环细胞中表达基因。Bcl-XL在初始T细胞中的表达是通过用来自CD 28 −/−或野生型供体小鼠的逆转录病毒感染的纯化骨髓干细胞重建致死性辐射受体小鼠的免疫系统来实现的。我们的研究表明,Bcl-XL抑制了CD 28 −/− T细胞的存活,但不能恢复正常的增殖或效应细胞发育。这些结果表明,CD 28的各种功能可以被解离,并提供了一种实验方法,用于测试下游信号在细胞受体如CD 28的功能中的作用。
Lymphocytes deficient in the T cell costimulatory molecule CD28 exhibit defects in cell survival, clonal expansion, and differentiation into effector cells. It is known that CD28-mediated signaling results in the upregulation of the Bcl family member Bcl-XL. To investigate the role that Bcl-XL plays in the various functions of CD28, we expressed Bcl-XL in CD28-deficient primary T lymphocytes using retrovirus-mediated gene transfer. T cells were activated in vitro and infected with Bcl-XL or control retroviruses; this method allows gene expression in activated, cycling cells. Expression of Bcl-XL in naive T cells was achieved by reconstitution of the immune system of lethally irradiated recipient mice with retrovirus-infected purified bone marrow stem cells from CD28−/− or wild-type donor mice. Our studies demonstrate that Bcl-XL prolongs the survival of CD28−/− T cells but does not restore normal proliferation or effector cell development. These results indicate that the various functions of CD28 can be dissociated, and provide an experimental approach for testing the roles of downstream signals in the functions of cellular receptors such as CD28.
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