微小RNA-26a通过抑制铁死亡减少高糖诱导的肾小管上皮细胞细胞外基质合成

microRNA-26a inhibits extracellular matrix synthesis in high glucose-induced renal tubular epithelial cells by regulating ferroptosis

目的 探究微小RNA-26a(miR-26a)对高糖(HG)诱导的肾小管上皮细胞(RTECs)细胞外基质(ECM)合成的作用及可能机制。方法 通过HG诱导RTECs以构建糖尿病肾病(DKD)模型,在HG诱导的RTECs中过表达miR-26a,使用RT-qPCR和Western blot检测ECM合成及铁死亡相关指标以评估miR-26a对HG诱导的RTECs中ECM合成及铁死亡的作用。使用ferrostatin(Fer-1)抑制DKD模型中铁死亡的发生并进一步评估其对ECM合成的影响。RT-qPCR和Western blot检测铁死亡的相关指标,荧光显微镜观察活性氧(ROS)荧光强度。结果 与Control相比,HG组细胞中miR-26a表达量降低,ECM合成相关指标fibronectin和collagenⅠ表达量升高,过表达miR-26a后,与HG组相比,HG+miR-26a组细胞miR-26a表达量升高,fibronectin和collagenⅠ表达量降低。在铁死亡方面,与Control组相比,HG组SLC7A11和GPX4的蛋白和mRNA表达量降低,TFR-1和ACSL4表达量升高,ROS荧光强度增强。抑制铁死亡后,HG+Fer-1组铁死亡及ECM合成相关指标表达水平较HG组均改变。再次过表达miR-26a后,HG+miR-26a组铁死亡相关指标表达水平较HG组均变化,ROS荧光强度降低。结论 在HG诱导的RTECs中,miR-26a抑制铁死亡的发生进而减少ECM合成。

Objective To investigate the effect and possible mechanism of microRNA-26a(miR-26a) on the synthesis of extracellular matrix(ECM) induced by high glucose(HG)in renal tubular epithelial cells(RTECs).Methods A model of diabetic kidney disease(DKD) was constructed by inducing RTECs with HG.MiR-26a was overexpressed in HG-induced RTECs,and RT-qPCR and Western blot were used to assess the effects of miR-26a on ECM synthesis and ferroptosis-related markers in HG-treated RTECs.Ferrostatin(Fer-1) was used to inhibit ferroptosis in the DKD model,and its impact on ECM synthesis was evaluated.RT-qPCR and Western blot were performed to measure ferroptosis-related markers,and fluorescence microscopy was used to observe the intensity of reactive oxygen species(ROS).Results Compared with the control group,the expression of miR-26a decreased in HG-treated cells,while the expression levels of ECM synthesis-related indexes fibronectin and collagen Ⅰ increased.After overexpressing miR-26a,the HG+miR-26a group showed a significant increase in miR-26a expression and a decrease in fibronectin and collagen Ⅰ expression compared to the HG group.In terms of ferroptosis,the protein and mRNA expression of SLC7A11 and GPX4 significantly decreased,the expression of TFR-1 and ACSL4 significantly increased,and the fluorescence intensity of ROS was significantly enhanced in the HG group compared with the control group.Inhibition of ferroptosis in the HG+Fer-1 group resulted in significant changes in ferroptosis and ECM synthesis-related indicators expression levels compared to the HG group.Furthermore,re-expression of miR-26a in the HG+miR-26a led to significant changes in ferroptosis-related indicators expression levels and decreased ROS fluorescence intensity compared to the HG group.Conclusions In HG-induced RTECs,miR-26a inhibits the occurrence of ferroptosis,thus reducing ECM synthesis.