Nat Commun:揭示巨噬细胞活化与肿瘤进展相关的调节机制

2018-07-04 胖胖同学 iNature

2018年7月3日,第三军医大学缪洪明课题组、梁后杰课题组、李咏生课题组与南方医科大学等研究人员合作在Nature Communications上在线发表了题为“Monoacylglycerol lipase regulates cannabinoid receptor 2-dependent macrophage activation and cancer progression"的研究论文。研

2018年7月3日,第三军医大学缪洪明课题组、梁后杰课题组、李咏生课题组与南方医科大学等研究人员合作在Nature Communications上在线发表了题为“Monoacylglycerol lipase regulates cannabinoid receptor 2-dependent macrophage activation and cancer progression"的研究论文。研究人员确定单酰基甘油脂肪酶(MGLL)缺乏会导致TAMS脂质超载。在功能上,巨噬细胞MGLL抑制CB2大麻素受体依赖的肿瘤进展在接种和基因癌症模型。机制上,MGLL缺陷可促进CB2/TLR 4依赖的巨噬细胞活化,进一步抑制肿瘤相关CD8 T细胞的功能。用CB2拮抗剂治疗可延缓接种和基因肿瘤模型的肿瘤进展。最后,研究证实巨噬细胞MGLL在肿瘤组织中的表达降低,并与肿瘤患者的生存呈正相关。综上所述,该研究发现MGLL是CB2/TLR 4依赖的巨噬细胞活化的一种开关,并为肿瘤治疗提供了潜在的靶点。

传统的癌症治疗,包括外科手术、细胞毒性化疗和放射治疗,旨在根除恶性细胞。然而,肿瘤细胞不能分离生长,肿瘤微环境中的间质细胞(T细胞、巨噬细胞等)也需要靶向以获得有效的治疗结果。这些结果可以直接通过免疫系统的主要效应物-细胞毒性CD8 T细胞(如检查点阻断策略中使用的)来实现,也可以通过间接地针对其他免疫细胞类型,如巨噬细胞3来实现。阻断CSF-1/CSF-1R信号通路可减弱巨噬细胞,刺激CD8 T细胞反应,从而降低小鼠乳腺癌和宫颈癌模型的肿瘤进展。


肿瘤相关巨噬细胞缺乏MGLL可导致脂质积聚

尽管病毒具有复杂的表型(异质性),但在体外,巨噬细胞被理想地定义为两个极端:“经典激活”(或“M1”)巨噬细胞或“交替激活”(或“M2”)巨噬细胞。M1巨噬细胞在局部干扰素γ(IFNγ)产生Th1反应的环境中极化,而M2巨噬细胞则对Th2反应的细胞因子(如IL-4和IL-13)作出反应。值得注意的是,肿瘤相关巨噬细胞(TAMS)容易出现M2样表型,产生Th2细胞因子,进而促进肿瘤的进展。然而,TAMS是如何再培养成M2样表型尚不清楚。


巨噬细胞MGLL通过CD8 +T细胞抑制肿瘤的进展

新的证据表明,代谢重编程极大地有助于巨噬细胞活化的调节。在脂质代谢中,饱和游离脂肪酸通过Toll样受体4(TLR4)和随后的NF-κB以及JNK途径诱导促炎活性;在先前的工作中,发现AB水解酶含有5(ABHD5),脂肪甘油三酯LIPASE9,ST的共激活剂。模拟NLRP3炎性体依赖性促炎活性。肿瘤微环境是一种特殊的小生境,其特点是缺血、缺氧、酸度和营养不良。所有的基质细胞都可能经过特殊的代谢重编程,以适应和生存在这种环境中。我们和其他人已经报道,癌相关骨髓细胞的脂质代谢在很大程度上改变了。然而,脂质的积累和相应的功能在TAMs尚不清楚。


靶向CB2延缓肿瘤进展

代谢重组对巨噬细胞活化的调节有重要作用。然而,肿瘤相关巨噬细胞(TAMS)脂质积聚的机制及相应的功能尚不清楚。通过对结肠癌的初步研究和其他癌症模型的证实,研究人员确定单酰基甘油脂肪酶(MGLL)缺乏会导致TAMS脂质超载。在功能上,巨噬细胞MGLL抑制CB2大麻素受体依赖的肿瘤进展在接种和基因癌症模型。机制上,MGLL缺陷可促进CB2/TLR 4依赖的巨噬细胞活化,进一步抑制肿瘤相关CD8 T细胞的功能。用CB2拮抗剂治疗可延缓接种和基因肿瘤模型的肿瘤进展。最后,研究证实巨噬细胞MGLL在肿瘤组织中的表达降低,并与肿瘤患者的生存呈正相关。综上所述,该研究发现MGLL是CB2/TLR 4依赖的巨噬细胞活化的一种开关,并为肿瘤治疗提供了潜在的靶点。

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    2018-09-29 liye789132251
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    2018-08-20 liuli5079
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    2018-07-06 jyzxjiangqin

    巨噬细胞活化与肿瘤进展相关.

    0

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    2018-07-05 zwjnj2

    好好学习天天向上认真学习

    0

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    2018-07-04 kafei

    学习了谢谢分享

    0

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干细胞能够分化成几种不同类型的细胞。乳腺干细胞在青春期促进乳房发育并且在妊娠和哺乳期间是非常活跃的。

Blood:受体骨髓固有巨噬细胞可显著影响造血干细胞移植预后!

中心点:受体巨噬细胞持续存在于在造血组织,并可在同基因移植后通过原位增殖进行自我定植。移植后,靶向耗竭受体CD169+巨噬细胞可破坏造血干细胞的长期骨髓植入。摘要:常驻组织巨噬细胞的不同亚群在造血干细胞壁龛稳态和红细胞生成过程中具有重要作用。近日,Blood杂志上发表一篇文章,Simranpreet Kaur等人在小鼠模型中利用髓系报告基因(Csf1r-eGFP)对骨髓和脾巨噬细胞亚集在经过致死性

Nat Biomed Eng:期待!这种免疫疗法能”吃掉“癌细胞,有望治疗多种恶性癌症

人体内的免疫细胞是抗击病原体的一支大军。无论是病毒、细菌、还是寄生虫,免疫细胞对大多数入侵者都能发动有效的攻击,保护我们免受疾病的困扰。

J Gastroenterol Hepatol:sCD163和sMR与CHB患者的组织学炎症活动度和纤维化有关;抗病毒治疗后,两者水平均降低

巨噬细胞活化标志物-sCD163和sMR均与CHB患者的组织学炎症活动度和纤维化有关。两种血清标志物在抗病毒治疗后,均降低,同时肝CD163表达也降低。