Cell Metab:魏海明/田志刚合作组揭示NK细胞丧失抗肿瘤功能背后的代谢调控过程

2018-07-20 BioArt BioArt

自然杀伤细胞 (natural killer cell,NK细胞) 是一种效应淋巴细胞,在机体抵抗肿瘤过程中发挥至关重要的作用。NK细胞无需预先致敏,即能够直接杀伤肿瘤细胞,并且能够通过分泌细胞因子促进适应性免疫的抗肿瘤作用。基于上述原理,NK细胞在肿瘤免疫治疗中的价值已得到广泛认可。然而,越来越多的研究表明,肿瘤生长过程中,肿瘤细胞可以通过多种机制诱导NK细胞功能紊乱,从而逃避NK细胞的监视,这

自然杀伤细胞 (natural killer cell,NK细胞) 是一种效应淋巴细胞,在机体抵抗肿瘤过程中发挥至关重要的作用。NK细胞无需预先致敏,即能够直接杀伤肿瘤细胞,并且能够通过分泌细胞因子促进适应性免疫的抗肿瘤作用。基于上述原理,NK细胞在肿瘤免疫治疗中的价值已得到广泛认可。然而,越来越多的研究表明,肿瘤生长过程中,肿瘤细胞可以通过多种机制诱导NK细胞功能紊乱,从而逃避NK细胞的监视,这主要是由于肿瘤细胞分泌的转化生长因子-β (TGF-β) 、前列腺素E2 (prostaglandin, PGE2) 和IL-10等因素造成的。肿瘤发生发展是一个漫长的过程,主要包括起始期、促进期和进展期三个阶段,然而在这整个过程中,NK细胞与肿瘤细胞如何相互作用仍不得而知。

近几年来,代谢调控在肿瘤、免疫、表观遗传等领域越来越受重视,对于NK细胞来说相关的代谢研究较少,目前主要集中在糖代谢调控与NK细胞功能方面。然而糖代谢的变化与NK细胞在肿瘤中的效应功能相关的而研究目前并不清楚。

2018年7月19日,Cell Metabolism在线发表了中国科学技术大学生命科学与医学部、中科院天然免疫与慢性疾病重点实验室和合肥微尺度物质科学国家研究中心魏海明教授和田志刚教授课题组合作研究的论文Dysfunction of Natural Killer Cells by FBP1-induced Inhibition of Glycolysis during Lung Cancer Progression,该项研究成果展示了肿瘤发生发展过程中自然杀伤细胞(NK细胞)的动态改变,并从糖代谢调控的角度揭示了一种NK细胞功能紊乱的新机制。

在这项研究中,研究人员利用Kras突变自发肺癌小鼠模型。研究表明,在肿瘤起始期,NK细胞有强大的抗肿瘤功能,但是在肿瘤促进期和进展期,NK细胞丧失了抗肿瘤能力。进一步研究发现,NK细胞丢失抗肿瘤能力与其自身功能紊乱密切相关,当肺癌发生后,肿瘤微环境累积大量TGF-β,进而促进NK细胞上调表达果糖-1,6-二磷酸酶 (Fructose 1,6-bisphosphatase,FBP1) 基因(FBP1是糖异生途径中的关键酶,该酶缺陷导致糖异生障碍,致使上游底物堆积和低血糖)。异常表达的FBP1抑制细胞自身糖酵解代谢,同时破坏细胞存活能力,最终导致NK细胞功能紊乱。而抑制NK细胞的FBP1活性,能够恢复NK细胞效应功能、存活能力和体内杀瘤能力。

总的来说,该研究通过小鼠肺癌模型,发现在肿瘤生发展过程中NK细胞是如何受肿瘤微环境的影响通过糖代谢调控逐步功能紊乱最终丧失其强大的抗肿瘤功能(FBP1能够通过抑制NK细胞糖酵解代谢从而削弱NK细胞功能)。这从一定程度上丰富了人们对NK细胞在与肿瘤细胞相互较量过程的认识,而靶向FBP1提高NK细胞功能可以作为优化NK细胞肿瘤免疫治疗的新策略。

肿瘤微环境通过诱导NK细胞代谢重编程抑制其功能

据悉,第一作者为中国科大丛靖婧博士,魏海明教授和田志刚教授为论文共同通讯作者。

原始出处:
Jingjing Cong, Xianwei Wang, Xiaohu Zheng,et al.Dysfunction of Natural Killer Cells by FBP1-Induced Inhibition of Glycolysis during Lung Cancer Progression.Cell Metabolism.DOI: https://doi.org/10.1016/j.cmet.2018.06.021

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    2018-07-20 wzb521zf

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研究结论:GS-9620的12周治疗对患者血清HBsAg水平无显著影响,但似乎增加了T细胞和NK细胞的反应,降低了NK抑制T细胞的能力。

Blood:IL-15强兴奋剂复合物ALT-803用于干细胞移植后复发的恶性血液病的效果

对于异体造血干细胞移植(allo-HCT)后复发的恶性血液肿瘤患者,需探寻新的治疗手段。白介素(IL)-15是可刺激CD8+T细胞和NK细胞产生抗肿瘤反应的细胞因子,现有研究人员推测,IL-15或可增强体内的抗白血病/淋巴瘤免疫。为验证上述推测,Rizwan Romee等人进行一多中心的一期试验,招募allo-HCT治疗60天后复发的患者,评估IL-15强兴奋剂复合物ALT-803用于该患者人群的

Immunity:这种细胞可帮助胎儿生长,可为治疗反复性流产提供新思路

胚胎发育受限和反复流产是临床常见的妊娠相关疾病,与母胎免疫系统的微环境异常密切相关。12月19日,发表在《Immunity》杂志封面的一项研究揭示了子宫内的一种自然杀伤细胞,通过分泌生长因子促进胚胎的发育。这为临床治疗胎儿生长受限和反复性流产提供了新思路。