AUTOPHAGY:黄酮B诱导内质网应激,抑制胶质瘤生长

2018-08-18 海北 MedSci原创

黄酮B(FKB)是一种天然的卡瓦查尔酮,在各种癌症中表现出强大的抗肿瘤活性。然而,至今为止,其作用机制仍不清楚。

黄酮BFKB)是一种天然的卡瓦查尔酮,在各种癌症中表现出强大的抗肿瘤活性。然而,至今为止,其作用机制仍不清楚。最近,山东大学的研究人员评估了FKB在治疗人类多形性胶质母细胞瘤(GBM)中的功效,以及其在癌症中抑制作用的分子基础。

使用衰老相关(SA-GLB1 / SA-β-半乳糖苷酶测定法,研究人员发现,在用FKB处理后,大约60%的GBM细胞变得衰老。自噬的细胞过程可能有助于衰老的建立。透射电子显微镜显示,在FKB处理下细胞内会形成自噬囊泡,并且MAP1LC3B(微管相关蛋白1轻链-II有所增加。

转染ATG5ATG7小干扰RNAsiRNA)可以抑制UKB1细胞中FKB诱导的自噬。蛋白质印迹揭示内质网应激通路的分子成分被激活,包括ATF4(激活转录因子4)和DDIT3DNA损伤诱导转录物3),而TRIB3tribbles假激酶3)水平增加。

此外,基于磷酸化状态,研究人员发现AKT-MTOR-RPS6KB1途径被抑制,其诱导GBM细胞中的自噬。通过自噬抑制剂3-甲基腺嘌呤和氯喹,或ATG5ATG7的敲低来抑制自噬,可以导致FKB处理的U251细胞从衰老转变为凋亡。最后,敲除ATG5或用氯喹与FKB组合处理显着抑制体内肿瘤生长。

因此,该结果证明,FKB通过GBM细胞中的ATF4-DDIT3-TRIB3-AKT-MTOR-RPS6KB1信号传导途径诱导保护性自噬,表明FKB与自噬抑制剂的组合治疗可能是GBM的有效治疗策略。


原始出处:

Jiwei Wang et al. Inhibition of glioma growth by flavokawain B is mediated through endoplasmic reticulum stress induced autophagyAutophagy, 2018; DOI: https://doi.org/10.1080/15548627.2018.1501133


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    2018-09-03 fengyi821
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    2018-08-19 wxl882001

    了解一下

    0

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    2018-08-19 kafei

    学习了谢谢

    0