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. 2021 Dec 15;9:774370. doi: 10.3389/fcell.2021.774370

FIGURE 5.

FIGURE 5

circRNA–miRNA–mRNA axis in OA. circRNAs can combine with miRNAs to promote the expression of related target genes. (A) circRNAs that play a role in cell proliferation and apoptosis. (B) circRNAs that play a role in degradation of the extracellular matrix and apoptosis. (C) circRNAs that play a role in degradation of the extracellular matrix, cell proliferation, apoptosis, and inflammation. NAMPT = nicotinamide phosphoribosyltransferase; MMP13 = matrix metalloproteinase.