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Mével E, Shutter JA, Ding X, Mattingly BT, Williams JN, Li Y, Huls A, Kambrath AV, Trippel SB, Wagner D, Allen MR, O'Keefe R, Thompson WR, Burr DB, Sankar U. Systemic inhibition or global deletion of CaMKK2 protects against post-traumatic osteoarthritis. Osteoarthritis Cartilage 2022; 30:124-136. [PMID: 34506942 PMCID: PMC8712369 DOI: 10.1016/j.joca.2021.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 08/17/2021] [Accepted: 09/01/2021] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To investigate the role of Ca2+/calmodulin-dependent protein kinase 2 (CaMKK2) in post-traumatic osteoarthritis (PTOA). METHODS Destabilization of the medial meniscus (DMM) or sham surgeries were performed on 10-week-old male wild-type (WT) and Camkk2-/- mice. Half of the DMM-WT mice and all other cohorts (n = 6/group) received tri-weekly intraperitoneal (i.p.) injections of saline whereas the remaining DMM-WT mice (n = 6/group) received i.p. injections of the CaMKK2 inhibitor STO-609 (0.033 mg/kg body weight) thrice a week. Study was terminated at 8- or 12-weeks post-surgery, and knee joints processed for microcomputed tomography imaging followed by histology and immunohistochemistry. Primary articular chondrocytes were isolated from knee joints of 4-6-day-old WT and Camkk2-/- mice, and treated with 10 ng/ml interleukin-1β (IL)-1β for 24 or 48 h to investigate gene and protein expression. RESULTS CaMKK2 levels and activity became elevated in articular chondrocytes following IL-1β treatment or DMM surgery. Inhibition or absence of CaMKK2 protected against DMM-associated destruction of the cartilage, subchondral bone alterations and synovial inflammation. When challenged with IL-1β, chondrocytes lacking CaMKK2 displayed attenuated inflammation, cartilage catabolism, and resistance to suppression of matrix synthesis. IL-1β-treated CaMKK2-null chondrocytes displayed decreased IL-6 production, activation of signal transducer and activator of transcription 3 (Stat3) and matrix metalloproteinase 13 (MMP13), indicating a potential mechanism for the regulation of inflammatory responses in chondrocytes by CaMKK2. CONCLUSIONS Our findings reveal a novel function for CaMKK2 in chondrocytes and highlight the potential for its inhibition as an innovative therapeutic strategy in the prevention of PTOA.
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Affiliation(s)
- E Mével
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - J A Shutter
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - X Ding
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - B T Mattingly
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - J N Williams
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - Y Li
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - A Huls
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - A V Kambrath
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - S B Trippel
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - D Wagner
- Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Department of Mechanical and Energy Engineering, School of Engineering and Technology, Indianapolis, IN, 46202, USA.
| | - M R Allen
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - R O'Keefe
- Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO, 63110, USA.
| | - W R Thompson
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Department of Physical Therapy, School of Health and Rehabilitation Sciences, Indianapolis, IN, 46202, USA.
| | - D B Burr
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
| | - U Sankar
- Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine, Indianapolis, IN, 46202, USA; Indiana Center for Musculoskeletal Health, Indiana University School of Medicine, Indianapolis, IN, 46202, USA.
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Qian X, Lin G, Wang J, Zhang S, Ma J, Yu B, Wu R, Liu M. CircRNA_01477 influences axonal growth via regulating miR-3075/FosB/Stat3 axis. Exp Neurol 2021; 347:113905. [PMID: 34699790 DOI: 10.1016/j.expneurol.2021.113905] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 10/21/2021] [Accepted: 10/21/2021] [Indexed: 01/13/2023]
Abstract
Circular RNAs (circRNAs) are important for the development and regeneration of the nervous system. We investigated the differential expression profiles of circRNA induced by spinal cord injury and reported that circRNA_01477 facilitates spinal astrocyte proliferation and migration after injury in rats. In this study, we further clarified the function and possible mechanism of action of circRNA_01477 in neurons. Fluorescence in situ hybridization assay revealed that circRNA_01477 is mainly localized in the neuronal cytoplasm. Knockdown of circRNA_01477 significantly increased axonal length. The circRNA_01477/microRNAs (miRNA)/messenger RNA (mRNA) interaction network was investigated using RNA sequencing. miRNA-3075 showed a remarkable increase after circRNA_01477 depletion, and either overexpression of miRNA-3075 or downregulation of its target gene FosB significantly promoted axonal growth. Luciferase reporter assay showed that miRNA-3075 could directly bind to the 3'UTR of FosB and negatively regulated FosB transcription. Dual silencing of circRNA_01477 and miR-3075 revealed that miR-3075 inhibition rescued the increased axon length caused by siCircRNA_01477. Finally, we verified that the Stat3 pathway was activated after FosB protein depletion in rat spinal neurons, while the NF-κB pathway was not altered. In summary, our study is the first to report that circRNA_01477 contributes to axon growth by functioning as miRNA sponge by regulating the miRNA-3075/FosB/Stat3 axis.
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Affiliation(s)
- Xiaowei Qian
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, China; Medical School, Nantong University, China; School of Life Sciences, Nantong University, China
| | - Ge Lin
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, China
| | - Junpei Wang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, China
| | - Siming Zhang
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, China
| | - Jingyi Ma
- Medical School, Nantong University, China
| | - Bin Yu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, China
| | - Ronghua Wu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, China.
| | - Mei Liu
- Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, NMPA Key Laboratory for Research and Evaluation of Tissue Engineering Technology Products, Nantong University, China.
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