Abstract
Fibroblast growth factor 2 (FGF2) plays an important role in the development of osteoarthritis (OA) through the regulation of cartilage degradation. However, the molecular mechanism underlying FGF2-induced OA is poorly characterized. MicroRNAs (miRNAs) maintain cartilage homeostasis. To examine whether FGF2 regulates OA through the modulation of miRNA, we screened potential miRNA molecules that could be regulated through FGF2 using microarray analysis. The results showed that microRNA-105 (miR-105) was significantly downregulated in chondrocytes stimulated with FGF2. Runt-related transcription factor 2 (Runx2), a key transcription factor involved in OA, has been identified as a novel potential target of miR-105. FGF2 suppressed miR-105 expression through the recruitment of the subunit of the nuclear factor kappa B transcription complex p65 to the miR-105 promoter. The knockdown of Runx2 mimicked the effect of miR-105 and abolished the ability of miR-105 to regulate the expression of a disintegrin-like and metalloproteinase with thrombospondin 4 (ADAMTS4), ADAMTS5, ADAMTS7 and ADAMTS12, both of which are responsible for the degradation of collagen 2A1 (COL2A1) and aggrecan (ACAN). miR-105 is also required for FGF2/p65-induced Runx2 activation and ADAMTS expression. Moreover, miR-105 expression was downregulated in OA patients and inversely correlated with the expression of Runx2, ADAMTS7 and ADAMTS12, which were upregulated in OA patients. These data highlight that the FGF2/p65/miR-105/Runx2/ADAMTS axis might play an important role in OA pathogenesis and that miR-105 might be a potential diagnostic target and useful strategy for OA treatment.
Key message
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Runx2 was identified as a novel direct target of miR-105.
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FGF2 inhibits miR-105 transcription through recruitment of p65 to miR-105 promoter.
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p65/miR-105 is essential for FGF2-mediated Runx2 and ADAMTS upregulation.
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miR-105 is downregulated in OA and inversely correlated with Runx2 expression.
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Acknowledgments
The authors would like to thank Dr. Jiying Chen and Dr. Zhigang Wang for collecting the data and Dr. Min Wei for valuable comments and sample provision. The work was financially supported through grants from the National Natural Science Foundation (81330053, 81472589, 81101387, 81371976, 31100604 and 81372161), Beijing Natural Science Foundation (7152135) and Beijing Nova Program (Z141102001814055). The General Hospital of Chinese People’s Liberation Army and Beijing Institute of Biotechnology contributed equally to this work.
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Quanbo Ji, Xiaojie Xu, Yameng Xu and Zhongyi Fan contributed equally to this work.
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Fig. S1
Potential target genes of miR-105 screened. a Candidate target genes of miR-105 were found using publicly available databases (TargetScan and miRanda). b Immunoblot analysis showing the expression of the candidate target genes in chondrocytes infected with miR-105. (TIF 369 kb)
Fig. S2
FGF2/p65 promotes Runx2 and ADAMTS expression through miR-105 in human chondrocytes. Human cultured chondrocytes (passage 1) were infected with miR-105 mimics or miR-105 inhibitor and the non-target control for 48 h as described in the Methods section. Then, the infected cells were stimulated with or without FGF2. Chondrocytes were subjected to quantitative RT-PCR to determine the expression of miR-105 and the mRNA levels of Runx2, ADAMTS4. ADAMTS5, ADAMTS7 and ADAMTS12. Values are the mean of at least three independent experiments performed in triplicate ± standard deviation. * P < 0.05; ** P < 0.01. (TIF 307 kb)
Fig. S3
Knockdown of Runx2 in chondrocytes results in decreased pro-catabolic responses. a Human cultured chondrocytes (passage 1) were infected with Runx2, Runx2 shRNA or a non-target control for 48 h as described in the Methods section. ADAMTS7, ADAMTS12, ADAMTS4 or ADAMTS5 expression was examined by western blot. b Quantitative RT-PCR was performed to evaluate the mRNA levels of ADAMTS4, ADAMTS5, ADAMTS7 and ADAMTS12. Values are the mean of at least three independent experiments performed in triplicate ± standard deviation. * P < 0.05; ** P < 0.01. (TIF 397 kb)
Fig. S4
Expression of miR-105, Runx2, ADAMTS7 and ADAMTS12 in patients with CA. Runx2, ADAMTS7 and ADAMTS12 scores and miR-105 expression in CA and normal tissue were plotted and compared. (TIF 290 kb)
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Ji, Q., Xu, X., Xu, Y. et al. miR-105/Runx2 axis mediates FGF2-induced ADAMTS expression in osteoarthritis cartilage. J Mol Med 94, 681–694 (2016). https://doi.org/10.1007/s00109-016-1380-9
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DOI: https://doi.org/10.1007/s00109-016-1380-9