CYP2E1 and miRNA‐378a‐3p contribute to acetaminophen‐ or tripterygium glycosides‐induced hepatotoxicity

Increased expression of CYP2E1 may represent the main factor contributing to oxidative stress‐mediated liver damage in drug‐induced liver injury (DILI). However, the regulation mechanism of CYP2E1 expression is poorly described. The present study was aimed to investigate the role of CYP2E1 in acetaminophen (APAP)‐ or tripterygium glycosides (TG)‐induced hepatotoxicity as well as the regulation of CYP2E1 and miR‐378a‐3p expression by APAP or TG. Rats were randomly divided and treated with APAP, TG, chlormethiazole (CMZ), APAP + CMZ and TG + CMZ, respectively, for 4 weeks. Then, blood and liver samples were collected. Serum and hepatic biochemical parameters were measured using commercial kits. Liver histopathology was tested by H&E staining. Expression levels of CYP2E1 mRNA and miR‐378a‐3p were detected by qRT‐PCR. CYP2E1 protein expression was determined by Western blot. Our results showed that CMZ effectively restored the hepatic histopathological changes, oxidative stress biomarkers and TNF‐α levels induced by APAP or TG. CYP2E1 mRNA and/or protein expression levels were dramatically increased after chronic APAP or TG treatment, while this induction was significantly reversed by CMZ co‐treatment. Of note, miR‐378a‐3p expression levels were significantly suppressed after APAP, TG and/or CMZ treatment. These results suggested that CYP2E1 were highly induced after chronic APAP or TG treatment, which in turn play an important role in APAP‐ or TG‐induced hepatotoxicity. These inductions of CYP2E1 expression were probably carried out by inhibition of miR‐378a‐3p. Our findings might provide a new molecular basis for DILI.     

LncRNA OIP5-AS1靶向miR-511-3p抑制肺癌细胞的增殖、迁移和侵袭的影响

目的研究LncRNA OIP5-AS1对肺癌细胞的增殖、迁移和侵袭的影响以及作用机制。方法采用qRT-PCR法检测OIP5-AS1和miR-511-3p的表达量;采用MTT法检测细胞增殖;采用Transwell小室实验检测细胞迁移和侵袭;蛋白免疫印迹法检测CyclinD1、MMP-2蛋白表达量;双荧光素酶报告实验检测OIP5-AS1和miR-511-3p的靶向关系。结果与正常细胞肺上皮细胞BEAS-2B相比,肺癌细胞A549、NCI-H23和NCI-H2170中OIP5-AS1表达显著增加,miR-511-3表达显著降低,差异有统计学意义(P<0.05);敲低OIP5-AS1或者过表达miR-511-3p显著抑制了肺癌细胞A549的增殖、迁移和侵袭;OIP5-AS1可以靶向负调控miR-511-3p的表达,抑制miR-511-3p可以部分回复敲低OIP5-AS1对肺癌细胞A549的增殖、迁移和侵袭的影响(P<0.05)。结论 LncRNA OIP5-AS1通过靶向调控miR-511-3p的表达抑制肺癌细胞的增殖、迁移和侵袭。