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학술저널
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연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal 제60권 제11호
발행연도
2019.1
수록면
1,081 - 1,092 (12page)

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Purpose: Accumulating evidence suggests that microRNA-145 (miR-145) plays an important role in osteoarthritis (OA), which is achronic progressive joint disease. Long noncoding RNA metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) promotesmetastasis in cancers and functions as a sponge for miR-145. However, the role of MALAT1/miR-145 in OA pathogenesishas not yet been elucidated. Materials and Methods: The expression of MALAT1 and miR-145 was examined by quantitative real-time PCR; the interactionbetween miR-145, MALAT1 and a disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS) 5 was verified by luciferasereporter assay. Correlations among MALAT1, miR-145, and ADAMTS5 were analyzed by Spearman rank analysis. Chondrocytesviability and cartilage extracellular matrix (ECM) degradation were investigated with cell viability assay and Western blottinganalyzing expression of ADAMTS5, collagen type 2 alpha 1 (COL2A1), aggrecan (ACAN), and cartilage oligomeric matrix protein(COMP). Results: MALAT1 was upregulated, and miR-145 was downregulated in OA samples and IL-1β-induced chondrocytes. Mechanically,miR-145 could directly bind to MALAT1 and ADAMTS5. Moreover, miR-145 expression was negatively correlated withMALAT1 and ADAMTS5 expression in OA patients, whereas MALAT1 and ADAMTS5 expression was positively correlated. Functionally,overexpression of MALAT1 inhibited chondrocyte viability and promoted cartilage ECM degradation in IL-1β-inducedchondrocytes. In support thereof, MALAT1 silencing and miR-145 upregulation exerted the opposite effect in IL-1β-inducedchondrocytes. Moreover, the effect of MALAT1 was counteracted by miR-145 upregulation, and ADAMTS5 restoration couldabate miR-145 effects. Conclusion: An MALAT1/miR-145 axis contributes to ECM degradation in IL-1β-induced chondrocytes through targeting ADAMTS5,suggesting that MALAT1/miR-145/ADAMTS5 signaling may underlie human OA pathogenesis.

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