RETRACTED: MiR-125b Inhibits LPS-Induced Inflammatory Injury via Targeting MIP-1α in Chondrogenic Cell ATDC5 (Retracted Article)

Background/Aims: Chondrocyte apoptosis is largely responsible for cartilage degeneration in osteoarthritis (OA). MicroRNAs (miRNAs) play an important role in chondrogenesis and cartilage remodeling. This study explored the effect of miR-125b on inflammatory injury in chondrogenic cells. Methods: LPS was used to simulate inflammatory injury in murine chondrogenic ATDC5 cell lines. Targeting effect of miR-125b on MIP-1 alpha 3'UTR was assessed by dual luciferase activity assay. Regulatory effect of miR-125b on MIP-1 alpha expression and the potential regulatory mechanism on inflammatory injury were assessed by Western blot. Results: miR-125b expression was decreased in LPS-induced ATDC5 cells and overexpression of miR-125b inhibited LPS-induced cell viability decline, the rise of apoptosis and inflammatory factors' productions. MIP-1 alpha expression was negatively related to miR-125b, and miR-125b directly targeted with 3'UTR of MIP-1 alpha. Knockdown of miR-125b promoted LPS-induced inflammatory response via upregulation of MIP-1 alpha. miR-125b expression in LPS-induced ATDC5 cells was negatively related with activations of NF-kappa B and JNK signaling pathways. Overexpression of miR-125b inhibited LPS-induced inflammation injury via suppressing MIP-1 alpha expression and inhibiting activations of NF-kappa B and JNK signaling pathways. Conclusion: miR-125b could play an important role in inflammatory injury of chondrogenic cells and miR-125b affected inflammatory injury of ATDC5 cells via regulating expression of MIP-1 alpha and regulating NF-kappa B and JNK signaling pathways. (C) 2018 The Author(s) Published by S. Karger AG, Basel