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J CIin Invest:华人科学家发现增强肿瘤免疫治疗的潜在新靶点

2018-05-24 佚名 细胞

PIM激酶是一个高度保守的丝氨酸/酪氨酸激酶家族,由PIM-1,PIM-2和PIM-3三个成员组成,其中PIM-2在造血细胞中表达,通过对靶向底物进行磷酸化来影响细胞存活,增殖,转录激活和蛋白质翻译。之前一些研究表明PIM-2激酶参与多种癌细胞类型的存活和增殖,其中包括B细胞淋巴瘤,多发性骨髓瘤和前列腺癌,表明PIM-2可能是癌症治疗的一个潜在靶点。

PIM激酶是一个高度保守的丝氨酸/酪氨酸激酶家族,由PIM-1,PIM-2和PIM-3三个成员组成,其中PIM-2在造血细胞中表达,通过对靶向底物进行磷酸化来影响细胞存活,增殖,转录激活和蛋白质翻译。之前一些研究表明PIM-2激酶参与多种癌细胞类型的存活和增殖,其中包括B细胞淋巴瘤,多发性骨髓瘤和前列腺癌,表明PIM-2可能是癌症治疗的一个潜在靶点。

最近来自南卡罗来纳医科大学的华人科学家Xue-Zhong Yu等人研究了PIM激酶在骨髓移植和肿瘤免疫的T细胞应答过程中发挥的作用。他们首先发现PIM-2能够对同种异型抗原产生的T细胞应答进行负调控,而PIM-1和PIM-3发挥正向调控作用。在进行了异源基因骨髓移植之后,缺失了PIM-2的T细胞出现向Th1亚群分化,增殖和向靶器官迁移增加的情况,这导致出现更加严重的移植物抗宿主疾病,重新恢复PIM-2的表达能够显着改善因T细胞缺失PIM-2而出现的移植物抗宿主疾病。

从另一方面来说,缺失了PIM-2的小鼠也会排斥同基因肿瘤,这种情况主要依赖CD8阳性的T细胞。更进一步的实验结果表明,在多克隆或抗原特异性CD8阳性T细胞中沉默PIM-2能够显着增强这些细胞在过继性T细胞免疫治疗中的抗肿瘤应答。

综上所述,PIM-2激酶在抑制T细胞应答方面发挥重要作用,这一发现为靶向PIM-2提高癌症免疫治疗效果提供了重要的理论支持。

原始出处:
Anusara Daenthanasanmak, et al. PIM-2 protein kinase negatively regulates T cell responses in transplantation and tumor immunity. JCI, https://doi.org/10.1172/JCI95407.

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    2018-05-26 lsndxfj
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    2018-05-25 大爰

    学习了谢谢分享!!

    0

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