Cancer Cell:科学家找到阻碍免疫系统绞杀癌细胞的“重要障碍”

2017-11-15 佚名 肿瘤免疫细胞治疗资讯

与以前认为的相反,免疫系统的癌症杀伤性T细胞在肿瘤的缺氧环境中更有效,尤其是接近生长因子VEGF-A时。研究人员在卡罗林斯卡研究所发表的一项研究中显示,在转录因子HIF-1a的帮助下,T细胞不仅能够在这种缺氧的微环境中生存下来,而且还能更有效地杀死癌细胞。

与以前认为的相反,免疫系统的癌症杀伤性T细胞在肿瘤的缺氧环境中更有效,尤其是接近生长因子VEGF-A时。研究人员在卡罗林斯卡研究所发表的一项研究中显示,在转录因子HIF-1a的帮助下,T细胞不仅能够在这种缺氧的微环境中生存下来,而且还能更有效地杀死癌细胞。

细胞毒性T细胞对于免疫系统杀死肿瘤细胞的能力是重要的。当T细胞进入肿瘤时,它们被认为是利用转录因子HIF,其与所有转录因子一样是调节基因表达从而调节细胞功能的蛋白质。转录因子HIF也特别能够帮助T细胞适应肿瘤的缺氧微环境。

研究人员现在表明,变体HIF-1a能使T细胞适应这种缺氧的环境,从而成功杀死肿瘤。在分析了变体HIF-2a之后,他们发现T细胞适应缺氧和抗肿瘤的能力不如HIF-1a。

Karolinska医学院细胞与分子生物学系的Randall Johnson教授说:“我们观察到T细胞能够检测氧气,并且通过适应有限的氧气量,他们可以进入缺氧的肿瘤,在其中生存,然后有效地杀死它们。

研究人员还使用小鼠模型试图从其T细胞中敲除VEGF-A(一种使血管生长的生长因子和一种HIF的靶基因)。

约翰逊教授解释说:“这样做,我们发现肿瘤增长,新血管的形成发生了变化。 “这很有趣,因为以前认为当你降低VEGF-A时肿瘤会饿死,我们的研究表明事情比这更复杂,我希望我们的发现能够导致更好的肿瘤治疗,最大限度地发挥T细胞的作用。 ”

原始出处:

Asis Palazon, et al.,An HIF-1α/VEGF-A Axis in Cytotoxic T Cells Regulates Tumor Progression.Cancer Cell.Volume 32, Issue 5, p669–683.e5, 13 November 2017.

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    2018-09-18 维他命
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    2017-11-17 yxch36