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低氧工作站在敲除OLFM4/HIF1α减少非小细胞肺癌的低氧诱...

2021.3.01

低氧工作站在敲除OLFM4/HIF1α减少非小细胞肺癌的低氧诱导损伤的应用


图1:西班牙肝脏和消化系统疾病网络生物医学研究中心在EBioMedicine发表文献
工作站及气体使用情况:Invivo2 400,低氧(1% O2),常氧(5%CO2,95%空气)
 

文章主要内容:OLFM4 参与增殖、分化、侵袭、凋亡和细胞粘附等多种细胞活动,而在NSCLC 中,HIF-1α因子也参与了细胞内多种反应,包括耐药、增殖和侵袭。本研究发现,在低氧条件下,HIF-1α可以调控 OLFM4 蛋白,且 NSCLC 细胞中OLFM4 的缺失可阻断癌细胞的侵袭及加速癌细胞对顺铂药物的敏感性,证明OLFM4 是化疗耐药的关键调控因子,提示 OLFM4 /HIF-1α轴可作为一种很有前途的 NSCLC 治疗靶点,沉默OLFM4 可用于克服缺氧诱导的顺铂耐药性。
图2:Expression of OLFM4 is upregulated in NSCLC cell lines. (d, g) RT‐PCR was applied to measure the expression of OLFM4 and HIF‐1α in hypoxic A549 (d) and H1299 (g) cells. (e, f, h, i) Western blot assay was conducted to determine the protein expression of OLFM4 and HIF‐1α in A549 (e, f) and H1299 (h, i) cells under
the hypoxic condition. Data represent the mean ± SD of three independent experiments.

与常氧(20.9% O2)条件相比,缺氧(1%  O2)环境下非小细胞肺癌(A549 和 H1299) 细胞中的 OLFM4 和 HIF‐1αmRNA (d,g)及蛋白表达(f,i)水平均显著增加。敲除 HIF‐1α基因后,随着 HIF‐1 基因与蛋白表达的减弱,OLFM4 基因与蛋白的表达也明显降低(f,g,i),表明 OLFM4 由 HIF‐1α调控。

图3: Depletion of OLFM4 enhances the drug sensitivity of cisplatin under hypoxia. (a) A549 cells were treated with different dosages of cisplatin for 24 hr under normoxia or hypoxia. Cell viabilities were measured by the MTT assay. A549 cells were treated with 20 μM cisplatin for 24 hr under normoxia or hypoxia. (b) Cell viabilities
were monitored by MTT assay. (c) Cell apoptosis was evaluated using ELISA‐based Cell Death Detection
ELISAPLUS Kit. (d–f) The protein expression levels of MDR1 and caspase 3 were determined using western blot assay.
与常氧(20.9%  O2)条件相比,A549 细胞在低氧(1%  O2)环境下对顺铂药物表现出较高的耐药性。敲除 OLFM4 基因后,缺氧条件下 A549 细胞不仅对顺铂的敏感性增强(细胞生存能力降低),凋亡速度也明显加快。



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