通过cGAMP介导的保护性抗瘤免疫反应可以在没有LRRC8/VRAC通道的情况下进行
Fabian M B Thöne1, Maya M Polovitskaya2, Uta E Höpken3
1Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Berlin; Graduate program of the Freie Universität Berlin, Germany.
The Journal of biological chemistry
|December 19, 2025
概括
体积调节的离子通道 (VRAC) 运输2'3'-cGAMP,这对于抗瘤免疫是至关重要的. 然而,这项研究发现瘤生长和免疫反应独立于小鼠的VRAC介导cGAMP运输.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 癌症研究 癌症研究
背景情况:
- 容量调节的离子通道 (VRAC),一个LRRC8A-异质六合体,运输化物和有机分子,如2'3'-cGAMP (cGAMP).
- 从瘤转移到宿主细胞的cGAMP对于抗瘤免疫至关重要,但VRAC的体内作用尚不清楚.
研究的目的:
- 在体内研究VRAC在cGAMP传输中的作用,以获得抗瘤免疫力.
- 为了确定瘤或宿主VRAC表达是否影响抗瘤免疫反应和瘤生长.
主要方法:
- 研究了同基因小鼠的皮下MC38和B16-F10瘤.
- 利用了LRRC8A缺乏的瘤细胞和具有选择性LRRC8亚单元破坏的小鼠.
- 评估瘤生长,血清细胞因子和抗瘤免疫反应.
主要成果:
- 缺乏cGAMP生产的MC38瘤显示增长,证实了cGAMP的重要性.
- 从MC38瘤中输出VRAC介导的cGAMP对血清细胞因子具有中度的免疫调节作用.
- 瘤生长和cGAMP介导的抗瘤免疫独立于瘤和宿主表达的VRAC.
- 对LRRC8B-LRRC8E亚单元的破坏没有影响T或B细胞发育.
结论:
- 虽然瘤产生的cGAMP抑制了瘤的生长,但其向瘤微环境的传输依赖于除VRAC之外的传送器.
- 在这种小鼠模型中,VRAC对cGAMP介导的抗瘤免疫不必.
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