PO.CL05.02 · 临床研究
IL-21 增强的 NK 细胞：一种针对胶质母细胞瘤干细胞的线粒体健适度增强策略
IL-21-Enhanced NK cells: A mitochondrial fitness enhancement for targeting glioblastoma stem cells
作者与单位 Authors & Affiliations
摘要 Abstract
中文摘要
胶质母细胞瘤（GBM）是一种侵袭性脑癌，由于胶质母细胞瘤干细胞（GSC）对常规疗法的耐药而复发。我们近期发现，用 IL-21 等细胞因子武装的脐带血来源 NK 细胞（CBNK）对 GSC 表现出增强的抗肿瘤活性，在多次再攻击后显示出更优的杀伤能力。IL-21 转导增强了 NK 细胞的多样性、多功能性和线粒体健适度，在体内胶质母细胞瘤模型中改善了肿瘤控制和生存期且无毒性。对细胞机制的深入研究揭示，IL-21 转导引发 NK 细胞代谢和线粒体特征的显著变化。RNA 测序显示，IL-21 转导上调了参与代谢重编程、线粒体自噬和线粒体健康的基因，包括 KLF2、GZMH、CLIC3 和 CEBPD。对线粒体功能的进一步研究证实，IL-21 CBNK 细胞的线粒体呼吸（OCR）改善，糖酵解活性（ECAR）降低，表明线粒体健适度增强。共聚焦显微镜显示，IL-21 CBNK 细胞的线粒体较小（线粒体自噬的标志），这与其他细胞因子转导或未转导的 CBNK 细胞有显著差异。此外，包括 Mitofusin-2 和 DRP1 在内的线粒体相关蛋白在 IL-21 NK 细胞中上调，证实了线粒体动力学的改善。抑制线粒体自噬可逆转 IL-21 转导 CBNK 细胞增强的杀伤能力。Seahorse Mito Fuel 检测确定葡萄糖和脂肪酸是 IL-21 CBNK 线粒体的主要燃料来源。阻断这些燃料会损害其抗肿瘤活性，进一步支持了线粒体代谢在 IL-21 驱动的 NK 细胞健适度中的作用。此外，CEBPD 作为参与线粒体自噬和线粒体代谢的关键转录因子，在 IL-21 转导的 CBNK 细胞中上调，进一步增强了其线粒体功能和抗肿瘤疗效。这些结果表明，IL-21 通过代谢重编程、线粒体健适度和 CEBPD 驱动的线粒体自噬增强了 NK 细胞的抗肿瘤效力，为胶质母细胞瘤提供了一种有前景的治疗策略。
查看英文原文 English abstract
Glioblastoma (GBM), an aggressive brain cancer, recurs due to the resistance of glioblastoma stem cells (GSCs) to conventional therapies. We recently showed that cord blood-derived NK cells (CBNK) armed with cytokines like IL-21 exhibit enhanced anti-tumor activity against GSCs, showing superior killing capacity after multiple re-challenges. IL-21 transduction enhances NK cell diversity, polyfunctionality, and mitochondrial fitness, improving tumor control and survival in an in vivo glioblastoma model without toxicity. A deeper dive into the cellular mechanisms revealed that IL-21 transduction triggers significant changes in the metabolic and mitochondrial profiles of NK cells. RNA sequencing revealed that IL-21 transduction upregulates genes involved in metabolic reprogramming, mitophagy, and mitochondrial health, including KLF2 , GZMH , CLIC3 , and CEBPD . Further investigations into mitochondrial function confirmed improved mitochondrial respiration (OCR) and reduced glycolytic activity (ECAR) in IL-21 CBNK cells, indicating enhanced mitochondrial fitness. Confocal microscopy revealed that IL-21 CBNK cells had smaller mitochondria, a hallmark of mitophagy, which was significantly different from other cytokine-transduced or non-transduced CBNK cells. Furthermore, mitochondrial-related proteins, including Mitofusin-2 and DRP1, were upregulated in IL-21 NK cells, confirming improved mitochondrial dynamics. Inhibition of mitophagy reversed the enhanced killing ability of IL-21 transduced CBNK cells. Seahorse Mito Fuel tests identified glucose and fatty acids as the primary fuel sources for IL-21 CBNK mitochondria. Blocking these fuels impaired their anti-tumor activity, further supporting the role of mitochondrial metabolism in IL-21-driven NK cell fitness. Additionally, CEBPD, a key transcription factor involved in mitophagy and mitochondrial metabolism, was upregulated in IL-21 transduced CBNK cells, further enhancing their mitochondrial function and anti-tumor efficacy. These results suggest that IL-21 enhances NK cell anti-tumor potency through metabolic reprogramming, mitochondrial fitness, and CEBPD-driven mitophagy, offering a promising therapeutic strategy for glioblastoma.
利益披露 Disclosure
M. Shanley, None..
S. Li, None..
M. Manandhar, None..
G. Sferruzza, None..
R. Basar, None..
M. Daher, None..
J. Dou, None..
J. Gumin, None..
A. Nunez Cortes, None..
S. Acharya, None..
D. Xiong, None..
N. Varadarajan, None.