TXNIP positively regulates the autophagy and apoptosis in the rat muller cell of diabetic retinopathy

LIFE SCIENCES

卷:267

Article

Ao, Haocheng¹  Li, Haichun¹  Zhao, Xiujuan¹  Liu, Bingqian¹  Lu, Lin¹ 

[1] Sun Yat Sen Univ, Zhongshan Ophthalm Ctr, State Key Lab Ophthalmol, Guangzhou 510060, Peoples R China

关键词: Diabetic retinopathy;    TXNIP;    Autophagy;    Apoptosis;    CRISPR/cas9;   

DOI  :  10.1016/j.lfs.2020.118988

来源: Elsevier

【 摘 要 】

Aims: Diabetic retinopathy (DR) can cause vision loss in patients with diabetes. The present study evaluated the expression of thioredoxin interacting protein (TXNIP) and investigated the role of TXNIP in autophagy and apoptosis of DR. Main methods: Reverse transcription-quantitative polymerase chain reaction (RT-qPCR) and western blotting were used to measure the expression level of the targets. Clustered regularly interspaced short palindromic repeats/CRISPR-associated 9 (CRISPR/cas9) method was applied for knockout of TXNIP. TdT-mediated dUTP Nick-End Labeling (TUNEL) assay and flow cytometry were utilized to detect the apoptosis. Cell Counting Kit-8 (CCK-8) assay was used to evaluate the cell viability. EdU assay was carried out to measure the cell proliferation ability. Retinal immunohistochemistry, retinal frozen section immunofluorescence as well as the electroretinogram (ERG) recording were implemented to detect the function of the retina. Key findings: TXNIP was up-regulated under hyperglycemic condition both in vivo and in vitro. Overexpression of TXNIP activated the autophagy and apoptosis in the rat muller cell. Knockout of TXNIP reduced the autophagy and apoptosis in the rat muller cell under high glucose condition. TXNIP positively regulates autophagy via inhibition of the PI3K/AKT/mTOR signaling pathway. Knockdown of TXNIP improved the visual response to light stimulus of DR. Significance: Our study unraveled for the first time that TXNIP positively regulates the autophagy in rat muller cell under high glucose condition by inhibiting the PI3K/AKT/mTOR signaling pathway, providing a novel understanding in the pathogenesis of DR and suggesting a potential new therapeutic target of DR.

【 授权许可】

Free