LncRNA HOXA11-AS intercepts the POU2F2-mediated downregulation of SLC3A2 in osteoarthritis to suppress ferroptosis

• Published in: Cellular signalling 2024-12, Vol.124, p.111399, Article 111399
• Main Authors: Yu, Baoxi, Zeng, Anyu, Liu, Hailong, Yang, Zhijian, Gu, Cheng, Luo, Xuming, Fu, Ming
• Format: Article
• Language: English
• Subjects: Amino Acid Transport System y+ - genetics; Amino Acid Transport System y+ - metabolism; Animals; Chondrocytes - metabolism; Chondrocytes - pathology; Down-Regulation; Ferroptosis; Ferroptosis - genetics; HOXA11-AS; Humans; Male; Mice; Mice, Inbred C57BL; Osteoarthritis; Osteoarthritis - genetics; Osteoarthritis - metabolism; Osteoarthritis - pathology; POU2F2; RNA, Long Noncoding - genetics; RNA, Long Noncoding - metabolism; SLC3A2
• ISSN: 0898-6568; 1873-3913; 1873-3913
• DOI: 10.1016/j.cellsig.2024.111399

Osteoarthritis (OA) is a prevalent ailment characterized by the gradual degradation of joints, resulting in discomfort and restricted movement. The recently proposed mechanism of ferroptosis is intricately associated with the initiation and progression of OA. Our study found that the long non-coding RNA HOXA11-AS reduces ferroptosis by increasing the expression of SLC3A2 through the transcription factor POU2F2. HOXA11-AS was identified through lncRNA microarray analysis, and its impact on chondrocytes and extracellular matrix was assessed using real-time quantitative PCR, western blotting, and CCK8 assays. Subsequently, overexpression of HOXA11-AS in the knee joints of mice confirmed its protective efficacy on chondrocyte phenotype in the OA model. The involvement of HOXA11-AS in regulating ferroptosis via SLC3A2 was further validated through RNA sequencing analysis of mouse cartilage and the assessment of malondialdehyde levels and glutathione peroxidase activity. Finally, a combination of RNA sequencing, pull-down assays, mass spectrometry (MS), and chromatin immunoprecipitation (ChIP) techniques was employed to identify POU2F2 as the crucial transcription factor responsible for repressing the expression of SLC3A2, which can be effectively inhibited by HOXA11-AS. Our study demonstrated that HOXA11-AS effectively enhanced the metabolic homeostasis of chondrocytes, and alleviated the progression of OA in vitro and in vivo experiments. Furthermore, HOXA11-AS was found to enhance SLC3A2 expression, a key regulator of ferroptosis, by interacting with the transcriptional repressor POU2F2. HOXA11-AS promotes SLC3A2 expression and inhibits chondrocyte ferroptosis, by binding to the transcriptional repressor POU2F2, offering a promising and innovative therapeutic approach for OA. •HOXA11-AS downregulation disrupts chondrocyte metabolic homeostasis, contributing to osteoarthritis(OA) progression.•HOXA11-AS enhances the expression of SLC3A2 and suppresses ferroptosis in chondrocytes.•The downregulated SLC3A2 in OA is mediated by POU2F2, a process that can be intercepted by HOXA11-AS.