Abstract
Introduction
Osteoarthritis (OA) compromises patients’ quality of life and requires further study. Although miR-92a-3p was reported to possess chondroprotective effects, the underlying mechanism requires further clarification. The objectives of this study were to elucidate the mechanism by which miR-92a-3p alleviates OA and to examine the efficacy of shRNA-92a-3p, which was designed based on mature miR-92a-3p.
Materials and methods
TargetScan and luciferase reporter assay were used to predict the target of miR-92a-3p. Adipose-derived stem cells (ADSCs) were transfected with miR-92a-3p/miR-NC mimic for the analysis of chondrogenic biomarkers and SMAD proteins. ADSCs and osteoarthritic chondrocytes were transduced with shRNA-92a-3p for the analysis of chondrogenic biomarkers and SMAD proteins. OA was surgically induced in C57BL/6JJcl mice, and ADSCs with/without shRNA-92a-3p transduction were intra-articularly injected for the assessment of cartilage damage.
Results
SMAD6 and SMAD7 were predicted as direct targets of miR-92a-3p by TargetScan and luciferase reporter assay. Transfection of the miR-92a-3p mimic resulted in a decrease in SMAD6 and SMAD7 levels and an increase in phospho-SMAD2/3, phospho-SMAD1/5/9, SOX9, collagen type II, and aggrecan levels in ADSCs. Furthermore, shRNA-92a-3p decreased SMAD6 and SMAD7 levels, and increased phospho-SMAD2/3, phospho-SMAD1/5/9, SOX9, collagen type II, and aggrecan levels in ADSCs and osteoarthritic chondrocytes. Additionally, ADSC-shRNA-92a-3p-EVs reduced the rate of decrease of SOX9, collagen type II, and aggrecan in osteoarthritic chondrocytes. In mice with surgically induced OA, shRNA-92a-3p-treated ADSCs alleviated cartilage damage more effectively than nontreated ADSCs.
Conclusions
miR-92a-3p and shRNA-92a-3p exhibit therapeutic effects in treating OA by targeting SMAD6 and SMAD7, thereby enhancing TGF-β signaling.
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Acknowledgements
This work is supported by Japan Society for the Promotion of Science KAKENHI [grant numbers #19K22700, #21H03136]. P0 Human ADSCs were kindly provided by a previous laboratory member Dr. Inaki (Miyagi National Hospital). P0 mouse ADSCs were kindly provided by Dr. IGARASHI (the department of Sensory and Motor System Medicine, the University of Tokyo). P0 Human OA chondrocytes were kindly provided by Dr. Saito (the department of orthopedic surgery and spinal surgery, the University of Tokyo Hospital).
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All authors contributed to the study conception and design. CZ prepared materials, performed the majority of the experiments described in this manuscript, and participated in the analysis of the histological data. AH and KH supervised the studies, provided technical support, and directed the interpretations of the result. Also, the first draft of the manuscript was written by CZ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Atsuhiko Hikita held an endowed chair supported by FUJISOFT INCORPORATED (until 31 October 2020) and an endowed chair supported by CPC corporation, Kyowa Co., Ltd., Kanto Chemical Co., Inc., and Nichirei Corporation (from 1 July, 2021, to 30 June, 2022), and is affiliated with the social cooperation program of Kohjin Bio Co., Ltd. (since 1 July, 2022). All other authors have no conflicts of interest.
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Zheng, C., Hoshi, K. & Hikita, A. miR-92a-3p-inspired shRNA exhibits pro-chondrogenic and chondrocyte protective effects in osteoarthritis treatment through targeting SMAD6/7. J Bone Miner Metab 42, 1–16 (2024). https://doi.org/10.1007/s00774-023-01474-3
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DOI: https://doi.org/10.1007/s00774-023-01474-3