HeLa cells cocultured with peripheral blood lymphocytes acquire an immuno-inhibitory phenotype through up-regulation of indoleamine 2,3-dioxygenase activity

被引:26
作者
Logan, GJ
Smyth, CMF
Earl, JW
Zaikina, I
Rowe, PB
Smythe, JA
Alexander, IE
机构
[1] Childrens Med Res Inst, Gene Therapy Res Unit, Westmead, NSW, Australia
[2] Childrens Hosp, Dept Biochem, Westmead, NSW, Australia
[3] Univ Sydney, Dept Paediat & Child Hlth, Westmead, NSW, Australia
关键词
D O I
10.1046/j.1365-2567.2002.01390.x
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
The mechanisms by which tumour cells escape recognition by the immune system or subvert antitumour effector responses remain poorly understood. In the course of investigating the potential of costimulatory signals in anticancer unmunotherapy strategies, we have observed that HeLa cells (a human cervical carcinoma cell line) cocultured with peripheral blood lymphocytes (PBL) acquire the capacity to inhibit PBL proliferation in response to interleukin-2 (IL-2). This immuno-inhibitory phenotype was further shown to result from induction of the tryptophan-catabolizing enzyme, indoleamine 2,3-dioxygenase (IDO), by interferon-gamma (IFN-gamma) secreted from cocultured allo-reactive PBL. This enzyme has recently been shown to be a critically important modulator of immunological responses, most notably through the capacity to protect allogeneic concepti from alloreactive maternal lymphocytes. While the cytostatic consequences of IDO activity in turnout, cells has received attention, the data presented in this report support the hypothesis that IDO activity may also act to impair antitumour immune responses.
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页码:478 / 487
页数:10
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