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Wu Y, Wang Y, Chen F, Wang B. Loading rutin on surfaces by the layer-by-layer assembly technique to improve the oxidation resistance and osteogenesis of titanium implants in osteoporotic rats. Biomed Mater 2024; 19:045011. [PMID: 38740037 DOI: 10.1088/1748-605x/ad4aa8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 05/13/2024] [Indexed: 05/16/2024]
Abstract
The purpose of this study was to construct a rutin-controlled release system on the surface of Ti substrates and investigate its effects on osteogenesis and osseointegration on the surface of implants. The base layer, polyethylenimine (PEI), was immobilised on a titanium substrate. Then, hyaluronic acid (HA)/chitosan (CS)-rutin (RT) multilayer films were assembled on the PEI using layer-by-layer (LBL) assembly technology. We used scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and contact angle measurements to examine all Ti samples. The drug release test of rutin was also carried out to detect the slow-release performance. The osteogenic abilities of the samples were evaluated by experiments on an osteoporosis rat model and MC3T3-E1 cells. The results (SEM, FTIR and contact angle measurements) all confirmed that the PEI substrate layer and HA/CS-RT multilayer film were effectively immobilised on titanium. The drug release test revealed that a rutin controlled release mechanism had been successfully established. Furthermore, thein vitrodata revealed that osteoblasts on the coated titanium matrix had greater adhesion, proliferation, and differentiation capacity than the osteoblasts on the pure titanium surface. When MC3T3-E1 cells were exposed to H2O2-induced oxidative stressin vitro, cell-based tests revealed great tolerance and increased osteogenic potential on HA/CS-RT substrates. We also found that the HA/CS-RT coating significantly increased the new bone mass around the implant. The LBL-deposited HA/CS-RT multilayer coating on the titanium base surface established an excellent rutin-controlled release system, which significantly improved osseointegration and promoted osteogenesis under oxidative stress conditions, suggesting a new implant therapy strategy for patients with osteoporosis.
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Affiliation(s)
- Yinsheng Wu
- Department of Orthopedics, Wenzhou Hospital of Integrated Traditional Chinese and Western Medicine, No. 75, JinXiu Road, Lucheng District, Wenzhou 325000, Zhejiang Province, People's Republic of China
| | - Yong Wang
- Department of Orthopedics, Wenzhou Hospital of Integrated Traditional Chinese and Western Medicine, No. 75, JinXiu Road, Lucheng District, Wenzhou 325000, Zhejiang Province, People's Republic of China
| | - Fengyan Chen
- Department of Orthopedics, Wenzhou Hospital of Integrated Traditional Chinese and Western Medicine, No. 75, JinXiu Road, Lucheng District, Wenzhou 325000, Zhejiang Province, People's Republic of China
| | - Bingzhang Wang
- Department of Orthopedics, Wenzhou Hospital of Integrated Traditional Chinese and Western Medicine, No. 75, JinXiu Road, Lucheng District, Wenzhou 325000, Zhejiang Province, People's Republic of China
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Zhang YY, Xie N, Sun XD, Nice EC, Liou YC, Huang C, Zhu H, Shen Z. Insights and implications of sexual dimorphism in osteoporosis. Bone Res 2024; 12:8. [PMID: 38368422 PMCID: PMC10874461 DOI: 10.1038/s41413-023-00306-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 11/04/2023] [Accepted: 11/27/2023] [Indexed: 02/19/2024] Open
Abstract
Osteoporosis, a metabolic bone disease characterized by low bone mineral density and deterioration of bone microarchitecture, has led to a high risk of fatal osteoporotic fractures worldwide. Accumulating evidence has revealed that sexual dimorphism is a notable feature of osteoporosis, with sex-specific differences in epidemiology and pathogenesis. Specifically, females are more susceptible than males to osteoporosis, while males are more prone to disability or death from the disease. To date, sex chromosome abnormalities and steroid hormones have been proven to contribute greatly to sexual dimorphism in osteoporosis by regulating the functions of bone cells. Understanding the sex-specific differences in osteoporosis and its related complications is essential for improving treatment strategies tailored to women and men. This literature review focuses on the mechanisms underlying sexual dimorphism in osteoporosis, mainly in a population of aging patients, chronic glucocorticoid administration, and diabetes. Moreover, we highlight the implications of sexual dimorphism for developing therapeutics and preventive strategies and screening approaches tailored to women and men. Additionally, the challenges in translating bench research to bedside treatments and future directions to overcome these obstacles will be discussed.
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Affiliation(s)
- Yuan-Yuan Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China
| | - Na Xie
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China
| | - Xiao-Dong Sun
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China
| | - Edouard C Nice
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC, 3800, Australia
| | - Yih-Cherng Liou
- Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore, 117543, Republic of Singapore
| | - Canhua Huang
- Department of Biotherapy, Cancer Center and State Key Laboratory of Biotherapy, West China Hospital, and West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, 610041, China
| | - Huili Zhu
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education, Department of Reproductive Medicine, West China Second University Hospital of Sichuan University, Chengdu, China.
| | - Zhisen Shen
- Department of Otorhinolaryngology and Head and Neck Surgery, The Affiliated Lihuili Hospital, Ningbo University, 315040, Ningbo, Zhejiang, China.
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3
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Zhang H, Hao J, Hong H, Gu W, Li Z, Sun J, Zhan H, Wei X, Zhou L. Redox signaling regulates the skeletal tissue development and regeneration. Biotechnol Genet Eng Rev 2023:1-24. [PMID: 37043672 DOI: 10.1080/02648725.2023.2199244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Skeletal tissue development and regeneration in mammals are intricate, multistep, and highly regulated processes. Various signaling pathways have been implicated in the regulation of these processes, including redox. Redox signaling is the signal transduction by electron transfer reactions involving free radicals or related species. Redox homeostasis is essential to cell metabolic states, as the ROS not only regulates cell biological processes but also mediates physiological processes. Following a bone fracture, redox signaling is also triggered to regulate bone healing and regeneration by targeting resident stromal cells, osteoblasts, osteoclasts and endothelial cells. This review will focus on how the redox signaling impact the bone development and bone regeneration.
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Affiliation(s)
- Hao Zhang
- Department of Orthopedics, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, East China, Shanghai, China
| | - Jin Hao
- Department of Orthopedics, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, East China, Shanghai, China
| | - HaiPing Hong
- FangTa Hospital of Traditional Chinese Medicine, Songjiang Branch, Shanghai, East China, China
| | - Wei Gu
- Department of Orthopedics, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, East China, Shanghai, China
| | | | - Jun Sun
- Department of Orthopedics, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, East China, Shanghai, China
| | - Hongsheng Zhan
- Department of Orthopedics, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, East China, Shanghai, China
| | - Xiaoen Wei
- Department of Orthopedics, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, East China, Shanghai, China
| | - Lin Zhou
- Department of Orthopedics, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, East China, Shanghai, China
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ROS-reactive PMS/PC drug delivery system improves new bone formation under diabetic conditions by promoting angiogenesis-osteogenesis coupling via down-regulating NOX2-ROS signalling axis. Biomaterials 2022; 291:121900. [DOI: 10.1016/j.biomaterials.2022.121900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 10/13/2022] [Accepted: 11/01/2022] [Indexed: 11/10/2022]
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Ma XY, Cui D, Wang Z, Liu B, Yu HL, Yuan H, Xiang LB, Zhou DP. Silk Fibroin/Hydroxyapatite Coating Improved Osseointegration of Porous Titanium Implants under Diabetic Conditions via Activation of the PI3K/Akt Signaling Pathway. ACS Biomater Sci Eng 2022; 8:2908-2919. [PMID: 35723990 DOI: 10.1021/acsbiomaterials.2c00023] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The application of three-dimensional printed porous titanium implants (TIs) is compromised in patients suffering from diabetes mellitus (DM), which disturbs the normal process of implant osseointegration, resulting in fixation failure. It was possibly because of reactive oxygen species (ROS) overproduction at the bone-implant interface. A silk fibroin-based hydroxyapatite (SF/HA) hybrid material emerged as a novel biological material for accelerating new bone formation. We proposed that the SF/HA hybrid coated titanium implant (SHT) could mitigate DM-mediated impaired osseointegration, which had never been reported previously. To test this assumption and further elucidate the mechanisms, primary rabbit osteoblasts were seeded on TIs or SHTs and cultured with normal serum, diabetic serum (DS), DS + N-acetyl-L-cysteine (NAC) (a potent ROS inhibitor), and DS + LY294002 (a specific PI3K/Akt inhibitor) for osteoblast behavior examinations. An animal study was performed on diabetic rabbits implanted with the two kinds of implants for osseointegration tests. DM-mediated ROS overproduction caused osteoblastic biological dysfunctions and apoptotic injury, associated with suppression of PI3K/Akt signaling in osteoblasts cultured on a TI substrate. Of note, the SHT substrate significantly suppressed ROS overproduction under diabetic conditions, improved osteoblast functional recovery including ameliorative osteoblast adhesion and morphology, improved cellular proliferation and differentiation, and abrogated apoptosis, which exhibited the same effect as NAC administration on the TI. The in vitro results were further corroborated in vivo by enhanced osteogenesis and osseointegration of SHTs in diabetic rabbits. Moreover, the aforesaid promotive effects afforded by the SF/HA coating were totally abolished with administration of LY294002 for blocking PI3K/Akt signaling. The above results collectively demonstrated that the SF/HA hybrid coating significantly ameliorated DM-mediated impaired osseointegration of the TI via reactivation of the ROS-mediated PI3K/Akt signaling pathway. The hybrid coating elicited a novel surface biofunctionalization strategy to attain favorable clinical performance of TI in diabetics.
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Affiliation(s)
- Xiang-Yu Ma
- Department of Orthopedics of General Hospital of Northern Theater Command, Shenyang 110016, Liaoning Province, China
| | - Dong Cui
- Department of Cardiology of No. 967 Hospital of PLA Joint Logistics Support Force, Dalian 116011, Liaoning Province, China
| | - Zheng Wang
- Department of Orthopedics of General Hospital of Northern Theater Command, Shenyang 110016, Liaoning Province, China
| | - Bing Liu
- Department of Orthopedics of General Hospital of Northern Theater Command, Shenyang 110016, Liaoning Province, China
| | - Hai-Long Yu
- Department of Orthopedics of General Hospital of Northern Theater Command, Shenyang 110016, Liaoning Province, China
| | - Hong Yuan
- Department of Orthopedics of General Hospital of Northern Theater Command, Shenyang 110016, Liaoning Province, China
| | - Liang-Bi Xiang
- Department of Orthopedics of General Hospital of Northern Theater Command, Shenyang 110016, Liaoning Province, China
| | - Da-Peng Zhou
- Department of Orthopedics of General Hospital of Northern Theater Command, Shenyang 110016, Liaoning Province, China
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Wang Z, Chen T, Wu Z, Jiang X, Hou Q, Miao S, Xia R, Wang L. The dual-effects of PLGA@MT electrospun nanofiber coatings on promoting osteogenesis at the titanium-bone interface under diabetic conditions. J Mater Chem B 2022; 10:4020-4030. [PMID: 35506736 DOI: 10.1039/d2tb00120a] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The high failure risk of endosseous titanium implants under diabetes conditions appeals to strengthen the osteointegration on the titanium-bone (Ti-B) interface. Melatonin (MT) is a neurohormone involved in bone homeostasis, which can promote osteogenesis and inhibit ROS overproduction through multiple pathways, but its effects on the Ti-B interface in diabetes remain elusive. The biodegradable poly(lactic-co-glycolic acid) (PLGA) has excellent controlled and sustained release properties, low cytotoxicity, and biocompatibility. Our study fabricated a nanofiber in which MT was encapsulated in PLGA to generate a nanofiber coating on a polydopamine (PDA)-modified titanium surface using electrospinning technology. The surface characteristic showed that MT was fully encapsulated in the PLGA carrier, and PLGA@MT was strongly coupled to the titanium matrix. Furthermore, the PLGA@MT-Ti nanofiber could release MT for at least 30 days. In vitro cellular tests demonstrated that PLGA@MT-Ti directly stimulates osteogenesis on the Ti-B interface by activating the BMP-4/WNT pathway in a dose-dependent manner. The effect of suppressing diabetes-induced ROS overproduction and promoting cell proliferation was not proportional to the content of MT. In vivo experiments revealed that PLGA@MT-Ti screws promoted the bone formation and osteointegration in type 1 diabetes mellitus (T1DM) mice with tibial bone defects. Our findings demonstrate that PLGA@MT-Ti exerted dual effects through activating the BMP-4/WNT pathway and attenuating ROS overproduction to promote osteogenesis and osteointegration at the Ti-B interface, providing a novel strategy to fabricate biomaterial modification and biofunctionalization under diabetic conditions.
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Affiliation(s)
- Zijie Wang
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Tingting Chen
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Zimei Wu
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Xingzhu Jiang
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Qiaodan Hou
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Sikai Miao
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Ruihao Xia
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China.
| | - Lin Wang
- School of Medicine, Southern University of Science and Technology, Shenzhen, 518055, China. .,Southern University of Science and Technology Hospital, Shenzhen, 518055, China
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Saito N, Mikami R, Mizutani K, Takeda K, Kominato H, Kido D, Ikeda Y, Buranasin P, Nakagawa K, Takemura S, Ueno T, Hosaka K, Hanawa T, Shinomura T, Iwata T. Impaired dental implant osseointegration in rat with streptozotocin-induced diabetes. J Periodontal Res 2022; 57:412-424. [PMID: 35037248 DOI: 10.1111/jre.12972] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/03/2021] [Accepted: 01/06/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Few studies have reported on the impact of oxidative stress on the dental implant failure. The aim of this study was to investigate the impact of hyperglycemia-induced oxidative stress on dental implant osseointegration in diabetes mellitus (DM). METHODS Acid-treated titanium implants were bilaterally placed in the maxillary alveolar ridge of streptozotocin-induced diabetic (DM group) and control rats after extraction of first molars. Histological analysis and micro-push-out test were performed 4 weeks after surgery. Oxidative stress and osteogenic markers in the surrounding bone were quantified by real-time polymerase chain reaction. In the in vitro study, rat bone marrow-derived mesenchymal stem cells (BMMSCs) were cultured on acid-treated titanium discs in a high-glucose (HG) or normal environment. Intracellular reactive oxygen species (ROS), cell proliferation, alkaline phosphatase (ALP) activity, and extracellular calcification were evaluated following antioxidant treatment with N-acetyl-L-cysteine (NAC). RESULTS The implant survival rate was 92.9% and 75.0% in control and DM group, respectively. Bone-implant contact and push-out loads were significantly lower in the DM group. Expression of superoxide dismutase 1 at the mRNA level and on immunohistochemistry was significantly lower in the DM group. In vitro experiments revealed that the HG condition significantly increased ROS expression and suppressed the proliferation and extracellular calcification of BMMSCs, while NAC treatment significantly restored ROS expression, cell proliferation, and calcification. The ALP activity of both groups was not significantly different. CONCLUSION In diabetes, high-glucose-induced oxidative stress downregulates proliferation and calcification of BMMSCs, impairing osseointegration and leading to implant failure.
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Affiliation(s)
- Natsumi Saito
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Risako Mikami
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Koji Mizutani
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Kohei Takeda
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Hiromi Kominato
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Daisuke Kido
- Oral Diagnosis and General Dentistry, Dental Hospital, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Yuichi Ikeda
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Prima Buranasin
- Department of Conservative Dentistry and Prosthodontics, Faculty of Dentistry, Srinakharinwirot University, Bangkok, Thailand
| | - Keita Nakagawa
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Shu Takemura
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Takeshi Ueno
- Department of Advanced Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Keiichi Hosaka
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.,Department of Regenerative Dental Medicine, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Takao Hanawa
- Department of Metallic Biomaterials, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Tamayuki Shinomura
- Department of Tissue Regeneration, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Takanori Iwata
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
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Zhu C, Shen S, Zhang S, Huang M, Zhang L, Chen X. Autophagy in Bone Remodeling: A Regulator of Oxidative Stress. Front Endocrinol (Lausanne) 2022; 13:898634. [PMID: 35846332 PMCID: PMC9279723 DOI: 10.3389/fendo.2022.898634] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 06/01/2022] [Indexed: 12/25/2022] Open
Abstract
Bone homeostasis involves bone formation and bone resorption, which are processes that maintain skeletal health. Oxidative stress is an independent risk factor, causing the dysfunction of bone homeostasis including osteoblast-induced osteogenesis and osteoclast-induced osteoclastogenesis, thereby leading to bone-related diseases, especially osteoporosis. Autophagy is the main cellular stress response system for the limination of damaged organelles and proteins, and it plays a critical role in the differentiation, apoptosis, and survival of bone cells, including bone marrow stem cells (BMSCs), osteoblasts, osteoclasts, and osteocytes. High evels of reactive oxygen species (ROS) induced by oxidative stress induce autophagy to protect against cell damage or even apoptosis. Additionally, pathways such as ROS/FOXO3, ROS/AMPK, ROS/Akt/mTOR, and ROS/JNK/c-Jun are involved in the regulation of oxidative stress-induced autophagy in bone cells, including osteoblasts, osteocytes and osteoclasts. This review discusses how autophagy regulates bone formation and bone resorption following oxidative stress and summarizes the potential protective mechanisms exerted by autophagy, thereby providing new insights regarding bone remodeling and potential therapeutic targets for osteoporosis.
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Affiliation(s)
- Chenyu Zhu
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
- School of Sports Science, Wenzhou Medical University, Wenzhou, China
| | - Shiwei Shen
- The Second School of Medicine, Wenzhou Medical University, Wenzhou, China
| | - Shihua Zhang
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
- College of Sports and Health, Shandong Sport University, Jinan, China
| | - Mei Huang
- School of Kinesiology, Shanghai University of Sport, Shanghai, China
| | - Lan Zhang
- College of Sports and Health, Shandong Sport University, Jinan, China
- *Correspondence: Xi Chen, ; Lan Zhang,
| | - Xi Chen
- School of Sports Science, Wenzhou Medical University, Wenzhou, China
- *Correspondence: Xi Chen, ; Lan Zhang,
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Li Y, He Y, Chen G, Huang Z, Yi C, Zhang X, Deng F, Yu D. Selenomethionine protects oxidative-stress-damaged bone-marrow-derived mesenchymal stem cells via an antioxidant effect and the PTEN/PI3K/AKT pathway. Exp Cell Res 2021; 408:112864. [PMID: 34626586 DOI: 10.1016/j.yexcr.2021.112864] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 10/01/2021] [Accepted: 10/03/2021] [Indexed: 11/24/2022]
Abstract
Dental implant surgery is currently a routine therapy for the repair of missing dentition or dentition defects. Both clinical and basic research have elucidated that oxidative stress caused by the accumulation of reactive oxygen species (ROS) for various reasons impairs the process of osteointegration after dental implantation. Therefore, the osteogenic micro-environment must be ameliorated to decrease the damage caused by oxidative stress. Selenomethionine (SEMET) has been reported to play an important role in alleviating oxidative stress and accelerating cell viability and growth. However, it remains unclear whether it exerts protective effects on bone-marrow-derived mesenchymal stem cells (BMSCs) under oxidative stress. In this study, we explored the influence of selenomethionine on the viability and osteogenic differentiation of BMSCs under oxidative stress and the underlying mechanisms. Results showed that 1 μM selenomethionine was the optimum concentration for BMSCs under H2O2 stimulation. H2O2-induced oxidative stress suppressed the viability and osteogenic differentiation of BMSCs, manifested by the increases in ROS production and cell apoptosis rates, and by the decrease of osteogenic differentiation-related markers. Notably, the aforementioned oxidative damage and osteogenic dysfunction induced by H2O2 were rescued by selenomethionine. Furthermore, we found that the PTEN expression level was suppressed and its downstream PI3K/AKT pathway was activated by selenomethionine. However, when PTEN was stimulated, the PI3K/AKT pathway was down-regulated, and the protective effects of selenomethionine on BMSC osteogenic differentiation diminished, while the inhibition of PTEN up-regulated the protective effects of selenomethionine. Together, these results revealed that selenomethionine could attenuate H2O2-induced BMSC dysfunction through an antioxidant effect, modulated via the PTEN/PI3K/AKT pathway, suggesting that selenomethionine is a promising antioxidant candidate for reducing oxidative stress during the process of dental implant osteointegration.
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Affiliation(s)
- Yiming Li
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, 510055, PR China
| | - Yi He
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, 510055, PR China
| | - Guanhui Chen
- Department of Stomatology, The Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong, 518107, China
| | - Ziqing Huang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, 510055, PR China
| | - Chen Yi
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, 510055, PR China
| | - Xiliu Zhang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, 510055, PR China
| | - Feilong Deng
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, 510055, PR China.
| | - Dongsheng Yu
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, 510055, PR China.
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10
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Shi Z, Wang S, Deng J, Gong Z. PGC-1α attenuates the oxidative stress-induced impaired osteogenesis and angiogenesis regulation effects of mesenchymal stem cells in the presence of diabetic serum. Biochem Biophys Rep 2021; 27:101070. [PMID: 34286110 PMCID: PMC8278528 DOI: 10.1016/j.bbrep.2021.101070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 06/28/2021] [Accepted: 06/29/2021] [Indexed: 11/30/2022] Open
Abstract
Oxidative stress is believed to induce dysfunction of the bone remodeling process and be associated with progressive loss of bone mass. The peroxisome proliferator-activated receptor gamma coactivator 1α (PGC-1α) is a master controller during mitochondrial biogenesis and the antioxidant response. We postulated that PGC-1α could function as a cyto-protective effector in mesenchymal stem cells (MSCs) under oxidative stress conditions. In this study, diabetic serum was firstly used to treat MSCs to induce oxidative damage. The anti-oxidative protective effects of PGC-1α overexpression on MSCs, as well as MSCs' osteogenesis and angiogenic regulation effects were investigated in vitro. Results showed that diabetic conditions induced significantly increase of intracellular oxidative damage and mitochondrial permeability transition pore (mPTP) opening activity, decrease of cellular viability, and osteogenic differentiation and pro-angiogenic regulation effects of MSCs. However, the diabetic conditions induced oxidative impair on MSCs were significantly alleviated via PGC-1α overexpression under diabetic conditions. Taken together, this study indicates the anti-oxidative treatment potential of PGC-1α regulation as a promising strategy to promote coupling pro-osteogenesis and pro-angiogenesis effects of MSCs.
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Affiliation(s)
- Zongxin Shi
- Department of Orthopedic Surgery, Liangxiang Hospital of Beijing Fangshan District, and Liangxiang Teaching Hospital of Capital Medical University, No.45, Gongchen Ave., Liangxiang, Fangshan Dist., Beijing, 102488, China
| | - Shikun Wang
- Department of Orthopedic Surgery, Liangxiang Hospital of Beijing Fangshan District, and Liangxiang Teaching Hospital of Capital Medical University, No.45, Gongchen Ave., Liangxiang, Fangshan Dist., Beijing, 102488, China
| | - Jiechao Deng
- Department of Orthopedic Surgery, Liangxiang Hospital of Beijing Fangshan District, and Liangxiang Teaching Hospital of Capital Medical University, No.45, Gongchen Ave., Liangxiang, Fangshan Dist., Beijing, 102488, China
| | - Zishun Gong
- Department of Orthopedic Surgery, Liangxiang Hospital of Beijing Fangshan District, and Liangxiang Teaching Hospital of Capital Medical University, No.45, Gongchen Ave., Liangxiang, Fangshan Dist., Beijing, 102488, China
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11
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miR-124-3p promotes BMSC osteogenesis via suppressing the GSK-3β/β-catenin signaling pathway in diabetic osteoporosis rats. In Vitro Cell Dev Biol Anim 2020; 56:723-734. [PMID: 33085064 DOI: 10.1007/s11626-020-00502-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 08/31/2020] [Indexed: 10/23/2022]
Abstract
The purpose of this study is to investigate miRNAs' effects, targeting the Wnt signaling pathway, on osteogenic differentiation to provide new targets for diabetic osteoporosis treatments. Twelve male rats were divided into a normal rat group (NOR group) and a model rat group (MOD group). Cluster analysis of differentially expressed miRNAs and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis were performed. Primary rat bone marrow mesenchymal stem cells (BMSCs) were divided into a high-glucose group and a low-glucose group, and osteogenic differentiation was induced. Alkaline phosphatase (ALP) staining and Alizarin Red staining were used for pathological analysis of the cells. Western blot analysis was used to measure GSK-3β, β-catenin, p-β-catenin, c-Myc, and CyclinD1 expression. Immunofluorescence (IF) was used to analyze the effect of GSK-3β inhibitor (CHIR99021) on β-catenin and CyclinD1 expressions levels in BMSCs. A total of 428 differentially expressed miRNAs were found between the NOR and MOD groups. KEGG analysis showed that the target genes were mostly enriched in signaling pathways, including PI3K-Akt, focal adhesion, AGE-RAGE, HIF-1, and Wnt. qPCR verification demonstrated that miR-124-3p exhibited the greatest difference in expression level. In BMSCs, miR-124-3p overexpression could reverse the inhibited expression of BMSC osteogenic markers, including Alpl, Bglap, and Runx2, induced by high glucose. Western blot analysis revealed that the transfection of miR-124-3p mimics could further reverse the upregulated p-β-catenin and GSK-3β levels and the downregulated c-Myc and CyclinD1 levels induced by high glucose. IF results revealed that BMSCs treated CHIR99021 under high glucose showed the reduced GSK-3β and increased β-catenin and CyclinD1 expression levels. Our research highlighted miRNAs' important roles in regulating the Wnt pathway and provided new information for the diagnosis and treatment of diabetic osteoporosis.
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Lee CS, Hwang HS, Kim S, Fan J, Aghaloo T, Lee M. Inspired by nature: facile design of nanoclay-organic hydrogel bone sealant with multifunctional properties for robust bone regeneration. ADVANCED FUNCTIONAL MATERIALS 2020; 30:2003717. [PMID: 33122980 PMCID: PMC7591105 DOI: 10.1002/adfm.202003717] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Indexed: 05/19/2023]
Abstract
Bone repair is a complex process involving the sophisticated interplay of osteogenic stem cells, extracellular matrix, and osteoinductive factors, and it is affected by bacterial toxins and oxidative stress. Inspired by the nature of plant-derived phytochemicals and inorganic-organic analogues of the bone extracellular matrix, we report herein the facile design of a nanoclay-organic hydrogel bone sealant (NoBS) that integrates multiple physico-chemical cues for bone regeneration into a single system. Assembly of phytochemical-modified organic chitosan and silica-rich inorganic nanoclay serves as highly biocompatible and osteoconductive extracellular matrix mimics. The decorated phytochemical exerts inherent bactericidal and antioxidant activities, and acts as an intermolecular networking precursor for gelation with injectable and self-healing capabilities. Moreover, the NoBS exerts osteoinductive effects mediated by the nanoclay, which regulates the Wnt/β-catenin pathway, along with the addition of osteoinductive signals, resulting in bone regeneration in a non-healing cranial defect. Engineering of this integrated bone graft substitute with multifunctional properties inspired by natural materials may suggest a promising and effective approach for creating a favorable microenvironment for optimal bone healing.
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Affiliation(s)
- Chung-Sung Lee
- Division of Advanced Prosthodontics, University of California Los Angeles, CA 90095, USA
| | - Hee Sook Hwang
- Division of Advanced Prosthodontics, University of California Los Angeles, CA 90095, USA
| | - Soyon Kim
- Division of Advanced Prosthodontics, University of California Los Angeles, CA 90095, USA
| | - Jiabing Fan
- Division of Advanced Prosthodontics, University of California Los Angeles, CA 90095, USA
| | - Tara Aghaloo
- Division of Diagnostic and Surgical Sciences, University of California Los Angeles, CA 90095, USA
| | - Min Lee
- Division of Advanced Prosthodontics, University of California Los Angeles, CA 90095, USA
- Department of Bioengineering, University of California Los Angeles, CA 90095, USA
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13
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Orapiriyakul W, Tsimbouri MP, Childs P, Campsie P, Wells J, Fernandez-Yague MA, Burgess K, Tanner KE, Tassieri M, Meek D, Vassalli M, Biggs MJP, Salmeron-Sanchez M, Oreffo ROC, Reid S, Dalby MJ. Nanovibrational Stimulation of Mesenchymal Stem Cells Induces Therapeutic Reactive Oxygen Species and Inflammation for Three-Dimensional Bone Tissue Engineering. ACS NANO 2020; 14:10027-10044. [PMID: 32658450 PMCID: PMC7458485 DOI: 10.1021/acsnano.0c03130] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
There is a pressing clinical need to develop cell-based bone therapies due to a lack of viable, autologous bone grafts and a growing demand for bone grafts in musculoskeletal surgery. Such therapies can be tissue engineered and cellular, such as osteoblasts, combined with a material scaffold. Because mesenchymal stem cells (MSCs) are both available and fast growing compared to mature osteoblasts, therapies that utilize these progenitor cells are particularly promising. We have developed a nanovibrational bioreactor that can convert MSCs into bone-forming osteoblasts in two- and three-dimensional, but the mechanisms involved in this osteoinduction process remain unclear. Here, to elucidate this mechanism, we use increasing vibrational amplitude, from 30 nm (N30) to 90 nm (N90) amplitudes at 1000 Hz and assess MSC metabolite, gene, and protein changes. These approaches reveal that dose-dependent changes occur in MSCs' responses to increased vibrational amplitude, particularly in adhesion and mechanosensitive ion channel expression and that energetic metabolic pathways are activated, leading to low-level reactive oxygen species (ROS) production and to low-level inflammation as well as to ROS- and inflammation-balancing pathways. These events are analogous to those that occur in the natural bone-healing processes. We have also developed a tissue engineered MSC-laden scaffold designed using cells' mechanical memory, driven by the stronger N90 stimulation. These mechanistic insights and cell-scaffold design are underpinned by a process that is free of inductive chemicals.
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Affiliation(s)
- Wich Orapiriyakul
- Centre
for the Cellular Microenvironment, Institute of Molecular, Cell and
Systems Biology, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- Department
of Orthopedics, Faculty of Medicine, Prince
of Songkla University, Songkhla 90110, Thailand
| | - Monica P. Tsimbouri
- Centre
for the Cellular Microenvironment, Institute of Molecular, Cell and
Systems Biology, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Peter Childs
- Centre
for the Cellular Microenvironment, Division of Biomedical Engineering,
School of Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom
| | - Paul Campsie
- SUPA
Department of Biomedical Engineering, University
of Strathclyde, Glasgow G1 1QE, United Kingdom
| | - Julia Wells
- Bone
and Joint Research Group, Centre for Human Development, Stem Cells
and Regeneration, Institute of Developmental Sciences, University of Southampton, Southampton SO16 6YD, United Kingdom
| | - Marc A. Fernandez-Yague
- Centre for
Research in Medical Devices (CÚRAM), National University of Ireland Galway, Galway, Ireland
| | - Karl Burgess
- Glasgow
Polyomics, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Switchback Rd, Bearsden, Glasgow G61 1BD, United
Kingdom
| | - K. Elizabeth Tanner
- Centre
for the Cellular Microenvironment, Division of Biomedical Engineering,
School of Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom
- School
of Engineering and Materials Science, Queen
Mary University of London, Mile End Road, London E1 4NS, United Kingdom
| | - Manlio Tassieri
- Centre
for the Cellular Microenvironment, Division of Biomedical Engineering,
School of Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom
| | - Dominic Meek
- Department
of Orthopedics, Queen Elizabeth II University
Hospital, Glasgow G51 4TF, United Kingdom
| | - Massimo Vassalli
- Centre
for the Cellular Microenvironment, Division of Biomedical Engineering,
School of Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom
| | - Manus J. P. Biggs
- Centre for
Research in Medical Devices (CÚRAM), National University of Ireland Galway, Galway, Ireland
| | - Manuel Salmeron-Sanchez
- Centre
for the Cellular Microenvironment, Division of Biomedical Engineering,
School of Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom
| | - Richard O. C. Oreffo
- Bone
and Joint Research Group, Centre for Human Development, Stem Cells
and Regeneration, Institute of Developmental Sciences, University of Southampton, Southampton SO16 6YD, United Kingdom
| | - Stuart Reid
- SUPA
Department of Biomedical Engineering, University
of Strathclyde, Glasgow G1 1QE, United Kingdom
| | - Matthew J. Dalby
- Centre
for the Cellular Microenvironment, Institute of Molecular, Cell and
Systems Biology, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom
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14
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de Oliveira PGFP, Bonfante EA, Bergamo ETP, de Souza SLS, Riella L, Torroni A, Benalcazar Jalkh EB, Witek L, Lopez CD, Zambuzzi WF, Coelho PG. Obesity/Metabolic Syndrome and Diabetes Mellitus on Peri-implantitis. Trends Endocrinol Metab 2020; 31:596-610. [PMID: 32591106 DOI: 10.1016/j.tem.2020.05.005] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/08/2020] [Accepted: 05/26/2020] [Indexed: 12/27/2022]
Abstract
Literature has reported that up to 50% of dental implants may be affected by peri-implantitis, a bacteria-induced chronic inflammatory process, which promotes osteoclast-mediated bone resorption and inhibits bone formation, leading to progressive bone loss around implants. Current evidence points toward an increased risk for the development of peri-implantitis in both obesity/metabolic syndrome (MetS) and diabetes mellitus (DM) conditions relative to the healthy population. Currently, there is no effective treatment for peri-implantitis and the 50% prevalence in MetS and DM, along with its predicted increase in the worldwide population, presents a major concern in implant dentistry as hyperglycemic conditions are associated with bone-healing impairment; this may be through dysfunction of osteocalcin-induced glucose metabolism. The MetS/DM proinflammatory systemic condition and altered immune/microbiome response affect both catabolic and anabolic events of bone-healing that include increased osteoclastogenesis and compromised osteoblast activity, which could be explained by the dysfunction of insulin receptor that led to activation of signals related with osteoblast differentiation. Furthermore, chronic hyperglycemia along with associated micro- and macro-vascular ailments leads to delayed/impaired wound healing due to activation of pathways that are particularly important in initiating events linked to inflammation, oxidative stress, and cell apoptosis; this may be through deactivation of AKT/PKB protein, which possesses a pivotal role in drive survival and eNOS signaling. This review presents an overview of the local and systemic mechanisms synergistically affecting bone-healing impairment in MetS/DM individuals, as well as a rationale for hierarchical animal model selection, in an effort to characterize peri-implantitis disease and treatment.
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Affiliation(s)
- Paula Gabriela Faciola Pessôa de Oliveira
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, SP, Brazil; Department of Periodontology, School of Dentistry, University Center of State of Para, Belem, PA, Brazil
| | - Estevam A Bonfante
- Department of Prosthodontics and Periodontology, Bauru School of Dentistry, University of Sao Paulo, Bauru, SP, Brazil
| | - Edmara T P Bergamo
- Department of Prosthodontics and Periodontology, Bauru School of Dentistry, University of Sao Paulo, Bauru, SP, Brazil
| | - Sérgio Luis Scombatti de Souza
- Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, SP, Brazil
| | - Leonardo Riella
- Division of Nephrology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Andrea Torroni
- Hansjörg Wyss Department of Plastic Surgery, NYU Langone Health School of Medicine, New York, NY, USA
| | - Ernesto B Benalcazar Jalkh
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Department of Prosthodontics and Periodontology, Bauru School of Dentistry, University of Sao Paulo, Bauru, SP, Brazil
| | - Lukasz Witek
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Department of Biomedical Engineering, NYU Tandon School of Engineering, New York University, Brooklyn, NY, USA
| | - Christopher D Lopez
- Department of Plastic and Reconstructive Surgery, Johns Hopkins School of Medicine Baltimore, MD, USA
| | - Willian Fernando Zambuzzi
- Department of Chemical and Biological Sciences, Bioscience Institute (IBB), UNESP - São Paulo State University, Botucatu, São Paulo, Brazil
| | - Paulo G Coelho
- Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA; Hansjörg Wyss Department of Plastic Surgery, NYU Langone Health School of Medicine, New York, NY, USA; Department of Mechanical and Aerospace Engineering, NYU Tandon School of Engineering, Brooklyn, NY, USA.
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15
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Wang S, Yang J, Lin T, Huang S, Ma J, Xu X. Excessive production of mitochondrion‑derived reactive oxygen species induced by titanium ions leads to autophagic cell death of osteoblasts via the SIRT3/SOD2 pathway. Mol Med Rep 2020; 22:257-264. [PMID: 32468046 PMCID: PMC7248520 DOI: 10.3892/mmr.2020.11094] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Accepted: 04/04/2020] [Indexed: 12/29/2022] Open
Abstract
The incidence of peri-implant bone loss is high, and is a difficult condition to treat. Previous studies have shown that titanium (Ti) ions released from implants can lead to osteoblast cell damage, but the specific mechanisms have not been elucidated. The present study established a Ti ion damage osteoblast cell model. The levels of mitochondrion-derived reactive oxygen species (mROS) and autophagy, cell viability and the sirtuin 3 (SIRT3)/superoxide dismutase 2 (SOD2) pathway were examined in this model. It was found that Ti ions decreased osteoblast viability. Moreover, with increased Ti ion concentration, the expression levels of microtubule associated protein 1 light chain 3α (LC3) progressively increased, P62 decreased, autophagic flow increased and mROS levels increased. After the addition of an autophagy inhibitor Bafilomycin A1 and Mito-TEMPO, a mitochondrial antioxidant, the production of mROS was inhibited, the level of autophagy was decreased and cell activity was improved. In addition, with increased Ti ion concentration, the activity of SOD2 decreased, the acetylation level of SOD2 increased, the SIRT3 mRNA and protein expression levels decreased, and the activity of SIRT3 was significantly decreased. Furthermore, it was demonstrated that SIRT3 overexpression reduced the acetylation of SOD2 and increased the activity of SOD2, as well as reducing the production of mROS and the expression level of LC3, thus increasing cell viability. Therefore, the present results suggested that excessive production of mROS induced by Ti ions led to autophagic cell death of osteoblasts, which is dependent on the SIRT3/SOD2 pathway.
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Affiliation(s)
- Siqian Wang
- Department of Implantology, School and Hospital of Stomatology, Shandong University, Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong 250012, P.R. China
| | - Jingyuan Yang
- Department of Implantology, School and Hospital of Stomatology, Shandong University, Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong 250012, P.R. China
| | - Tingting Lin
- Department of Prothodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang 325027, P.R. China
| | - Shengbing Huang
- Department of Prothodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang 325027, P.R. China
| | - Jianfeng Ma
- Department of Prothodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang 325027, P.R. China
| | - Xin Xu
- Department of Implantology, School and Hospital of Stomatology, Shandong University, Shandong Key Laboratory of Oral Tissue Regeneration and Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong 250012, P.R. China
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16
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Lin Z, Wu S, Liu X, Qian S, Chu PK, Zheng Y, Cheung KMC, Zhao Y, Yeung KWK. A surface-engineered multifunctional TiO 2 based nano-layer simultaneously elevates the corrosion resistance, osteoconductivity and antimicrobial property of a magnesium alloy. Acta Biomater 2019; 99:495-513. [PMID: 31518705 DOI: 10.1016/j.actbio.2019.09.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 08/12/2019] [Accepted: 09/06/2019] [Indexed: 12/18/2022]
Abstract
Magnesium biometals exhibit great potentials for orthopeadic applications owing to their biodegradability, bioactive effects and satisfactory mechanical properties. However, rapid corrosion of Mg implants in vivo combined with large amount of hydrogen gas evolution is harmful to bone healing process which seriously confines their clinical applications. Enlightened by the superior biocompatibility and corrosion resistance of passive titanium oxide layer automatically formed on titanium alloy, we employ the Ti and O dual plasma ion immersion implantation (PIII) technique to construct a multifunctional TiO2 based nano-layer on ZK60 magnesium substrates for enhanced corrosion resistance, osteoconductivity and antimicrobial activity. The constructed nano-layer (TiO2/MgO) can effectively suppress degradation rate of ZK60 substrates in vitro and still maintain 94% implant volume after post-surgery eight weeks. In animal study, a large amount of bony tissue with increased bone mineral density and trabecular thickness is formed around the PIII treated group in post-operation eight weeks. Moreover, the newly formed bone in the PIII treated group is well mineralized and its mechanical property almost restores to the level of that of surrounding mature bone. Surprisingly, a remarkable killing ratio of 99.31% against S. aureus can be found on the PIII treated sample under ultra-violet (UV) irradiation which mainly attributes to the oxidative stress induced by the reactive oxygen species (ROS). We believe that this multifunctional TiO2 based nano-layer not only controls the degradation of magnesium implant, but also regulates its implant-to-bone integration effectively. STATEMENT OF SIGNIFICANCE: Rapid corrosion of magnesium implants is the major issue for orthopaedic applications. Inspired by the biocompatibility and corrosion resistance of passive titanium oxide layer automatically formed on titanium alloy, we construct a multifunctional TiO2/MgO nanolayer on magnesium substrates to simultaneously achieve superior corrosion resistance, satisfactory osteoconductivity in rat intramedullary bone defect model and excellent antimicrobial activity against S. aureus under UV irradiation. The current findings suggest that the specific TiO2/MgO nano-layer on magnesium surface can achieve the three objectives aforementioned and we believe this study can demonstrate the potential of biodegradable metals for future clinical applications.
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Affiliation(s)
- Zhengjie Lin
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, PR China; Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, China; Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma, The University of Hong Kong Shenzhen Hospital, 1 Haiyuan 1st Road, Futian District, Shenzhen, China
| | - Shuilin Wu
- School of Materials Science & Engineering, the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China, Tianjin University, Tianjin 300072, China
| | - Xuanyong Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Shi Qian
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; Cixi Center of Biomaterials Surface Engineering, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Ningbo, PR China
| | - Paul K Chu
- Department of Physics, Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Yufeng Zheng
- State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Kenneth M C Cheung
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, China
| | - Ying Zhao
- Centre for Human Tissues and Organs Degeneration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
| | - Kelvin W K Yeung
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, China; Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma, The University of Hong Kong Shenzhen Hospital, 1 Haiyuan 1st Road, Futian District, Shenzhen, China.
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17
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A functionalized TiO2/Mg2TiO4 nano-layer on biodegradable magnesium implant enables superior bone-implant integration and bacterial disinfection. Biomaterials 2019; 219:119372. [DOI: 10.1016/j.biomaterials.2019.119372] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 07/01/2019] [Accepted: 07/17/2019] [Indexed: 01/08/2023]
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18
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Li Y, Chen G, He Y, Zhang X, Zeng B, Wang C, Yi C, Yu D. Ebselen rescues oxidative-stress-suppressed osteogenic differentiation of bone-marrow-derived mesenchymal stem cells via an antioxidant effect and the PI3K/Akt pathway. J Trace Elem Med Biol 2019; 55:64-70. [PMID: 31345368 DOI: 10.1016/j.jtemb.2019.06.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 06/06/2019] [Accepted: 06/07/2019] [Indexed: 01/10/2023]
Abstract
BACKGROUND Patients with metabolic bone diseases often have high risk of titanium implant failure due to compromised bone regeneration ability. Clinical evidence indicates that the poor osteogenic ability is partly because of excessive oxidative stress. To date, specific treatments for these patients are urgently needed. Ebselen, a non-toxic organoselenium compound, is reported to be a potent antioxidant agent. In this study, we hypothesized that ebselen exerted protective effects on osteogenic differentiation of bone-marrow-derived mesenchymal stem cells (BMSCs) under oxidative stress. METHODS BMSCs were isolated from SD rats, and their morphology and multiple differentiation abilities were characterized. Proliferation rates of BMSCs treated with different concentrations of ebselen were analyzed. Then BMSCs were pretreated by hydrogen peroxide (H2O2), after which ebselen at different concentrations (0, 1, 5, 10 μM) was added, alkaline phosphatase (ALP) activity, mineralization and osteogenic-related protein levels were evaluated and an optimum concentration of ebselen was selected. Subsequently, intracellular reactive oxygen species (ROS) generation and the role of the PI3K/AKT pathway were also investigated. RESULTS Ebselen within a proper range could promote the proliferation of BMSCs. H2O2-induced oxidative stress suppressed osteogenic differentiation of BMSCs, which was verified by the decrease in ALP activity, calcium deposition, Runx2 and β-catenin expression. However, ebselen could alleviate osteogenic dysfunction of BMSCs. We also observed that ebselen reduced ROS accumulation in H2O2-pretreated BMSCs. Moreover, the pro-osteogenic effects afforded by ebselen were almost abolished by the Akt inhibitor. CONCLUSION We concluded that ebselen could attenuate osteogenic dysfunction of BMSCs induced by H2O2 through an antioxidant effect and the activation of the PI3K/Akt pathway, suggesting that ebselen has a potential therapeutic effect for patients with metabolic bone diseases.
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Affiliation(s)
- Yiming Li
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Guanhui Chen
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Yi He
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Xiliu Zhang
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Binghui Zeng
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Chao Wang
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Chen Yi
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China
| | - Dongsheng Yu
- Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, PR China.
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19
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Geng W, Shi H, Zhang X, Tan W, Cao Y, Mei R. Substance P enhances BMSC osteogenic differentiation via autophagic activation. Mol Med Rep 2019; 20:664-670. [PMID: 31115537 PMCID: PMC6580032 DOI: 10.3892/mmr.2019.10257] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 04/12/2019] [Indexed: 01/09/2023] Open
Abstract
Bone mesenchymal stem cells (BMSCs) are the most commonly investigated progenitor cells in bone tissue engineering for treating severe bone defects. Strategies for regulating BMSC differentiation fate have received wide attention, in which redox homeostasis plays an important role due to the change in energy metabolism during stem cell differentiation. In the present study, it was observed that autophagic activity was induced along with BMSC osteogenic differentiation and subsequently regulated reactive oxygen species (ROS) generation and the level of osteogenesis. Furthermore, it was also observed that neuropeptide substance P (SP) administration could enhance the autophagic activity in rat BMSCs via the AMPK and mTOR pathways, as well as decreasing ROS generation and promoting osteogenic differentiation. Inhibition of autophagic activity by 3‑MA reversed the effects of SP on ROS and osteogenic levels. The present results indicated that autophagic activity participated in the regulation of differentiation fate of BMSCs and SP could promote osteogenic differentiation by activating autophagy, providing a more precise biological mechanism for its application in bone tissue engineering.
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Affiliation(s)
- Wen Geng
- Department of Orthopaedics, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Huimin Shi
- Department of Ophthalmology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Ximin Zhang
- Department of Orthopaedics, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Wei Tan
- Department of Orthopaedics, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Yuan Cao
- Department of Orthopaedics, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Rongcheng Mei
- Department of Orthopaedics, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
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20
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Zhou J, Wang F, Ma Y, Wei F. Vitamin D3 contributes to enhanced osteogenic differentiation of MSCs under oxidative stress condition via activating the endogenous antioxidant system. Osteoporos Int 2018; 29:1917-1926. [PMID: 29860665 DOI: 10.1007/s00198-018-4547-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Accepted: 04/23/2018] [Indexed: 12/23/2022]
Abstract
UNLABELLED The anti-oxidative effects of vitamin D3 (Vd3) on mesenchymal stem cells (MSCs) have not been studied before. The present study suggested that Vd3 could not only promote the osteogenic differentiation of MSCs under normal condition but also partly protect it from oxidative stress damage by activating the endogenous antioxidant system. INTRODUCTION Evolving evidence proved that oxidative stress caused by reactive oxygen species (ROS) overproduction might lead to bone loss. Vd3, a commonly used osteogenic induction drug, was proved to exhibit potent anti-oxidative effects on other cell types. The present study aims to investigate the protective effects of Vd3 on oxidative stress-induced dysfunctions of MSCs, as well as its underlying mechanisms. METHODS The H2O2 was used as exogenous reactive oxygen species (ROS). The influence of ROS and anti-oxidative protection of Vd3 on MSCs were analyzed too. Multi-techniques were used to assess the beneficial effects of Vd3 on MSCs under oxidative stress condition. RESULTS The results demonstrated that Vd3 could significantly attenuate the H2O2-induced cell injury of MSCs via Sirt1/FoxO1 signaling pathway, and reduced the H2O2 exposure-induced intracellular oxidative stress status of MSCs. What's more, the H2O2 exposure resulted in the decreased osteogenic differentiation of MSCs, as evidenced by decreased alkaline phosphatase activity, calcium deposition level, and osteogenic differentiation gene mRNA levels, but the injury was restored via Vd3 administration. CONCLUSIONS The results suggested that Vd3 could not only promote the osteogenic differentiation of osteoblastic cells under normal condition but also partly protect the cell from oxidative stress damage by activating endogenous antioxidant system. The study shed light on the new roles of Vd3 in bone modeling and remodeling regulation.
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Affiliation(s)
- J Zhou
- Department of Orthopedics, Beijing Tongren Hospital, Capital Medical University, No.1, Dongjiaominxiang, Dongcheng District, Beijing, 100730, People's Republic of China.
| | - F Wang
- Department of Orthopedics, Beijing Tongren Hospital, Capital Medical University, No.1, Dongjiaominxiang, Dongcheng District, Beijing, 100730, People's Republic of China
| | - Y Ma
- Department of Orthopedics, Beijing Tongren Hospital, Capital Medical University, No.1, Dongjiaominxiang, Dongcheng District, Beijing, 100730, People's Republic of China
| | - F Wei
- Department of Orthopedics, Beijing Tongren Hospital, Capital Medical University, No.1, Dongjiaominxiang, Dongcheng District, Beijing, 100730, People's Republic of China
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Li J, Zhang J, Chen Y, Kawazoe N, Chen G. TEMPO-Conjugated Gold Nanoparticles for Reactive Oxygen Species Scavenging and Regulation of Stem Cell Differentiation. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35683-35692. [PMID: 28944661 DOI: 10.1021/acsami.7b12486] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Controlling the differentiation of human mesenchymal stem cells (hMSCs) shows a great potential in regenerative medicine. Because overproduced reactive oxygen species (ROS) have an obvious inhibitory effect on the differentiation and functions of hMSCs, it is highly desirable to develop an effective strategy for ROS scavenging and stem cell differentiation controlling. In this study, gold nanoparticles (Au NPs) with an average size of 40 nm were conjugated with 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) to endow them with ROS-scavenging capacity while holding the beneficial effect of Au NPs. The TEMPO-conjugated Au NPs (Au-PEG-TEMPO NPs) were used for the culture of hMSCs to investigate their effect on ROS scavenging, proliferation, and osteogenic and adipogenic differentiation of hMSCs. The Au-PEG-TEMPO NPs had a negligible influence on cell viability and proliferation of hMSCs and could effectively reduce the ROS level of hMSCs under H2O2-exposed conditions because of their excellent cellular uptake. Similar to the counterparts without surface TEMPO modification (Au-mPEG NPs), the Au-PEG-TEMPO NPs could promote the osteogenic differentiation of hMSCs, whereas they could inhibit the adipogenic differentiation of hMSCs. The results indicated that the TEMPO-conjugated Au NPs had high scavenging capacity for overproduced ROS and maintained the promotive effect of Au NPs on osteogenic differentiation of hMSCs without the inhibitory effect of free TEMPO. This study offers a promising strategy for ROS scavenging to control stem cell differentiation in stem cell transplantation and regenerative medicine.
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Affiliation(s)
- Jingchao Li
- Research Center for Functional Materials, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Department of Materials Science and Engineering, Graduate School of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Jing Zhang
- Research Center for Functional Materials, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Department of Materials Science and Engineering, Graduate School of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Ying Chen
- Research Center for Functional Materials, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Department of Materials Science and Engineering, Graduate School of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Naoki Kawazoe
- Research Center for Functional Materials, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Guoping Chen
- Research Center for Functional Materials, National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Department of Materials Science and Engineering, Graduate School of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
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Jin YQ, Li JL, Chen JD, Xu CL, Li H. Dalbergioidin (DAL) protects MC3T3-E1 osteoblastic cells against H 2O 2-induced cell damage through activation of the PI3K/AKT/SMAD1 pathway. Naunyn Schmiedebergs Arch Pharmacol 2017; 390:711-720. [PMID: 28374099 DOI: 10.1007/s00210-017-1365-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 03/05/2017] [Indexed: 12/27/2022]
Abstract
Reactive oxygen species (ROS) is a pivotal pathogenic factor in the development of osteoporosis. Dalbergioidin (DAL) can be isolated from Uraria crinite, an edible herb used as a natural food for childhood skeletal dysplasia. Recent research has implicated DAL as having an antiosteoporosis effect, although the mechanism of this is unclear. We used an effective oxidative stress model, induced by hydrogen peroxide (H2O2) in osteoblastic MC3T3-E1 cells, to investigate the protective effects of DAL in osteoporosis and the underlying molecular mechanisms. The results indicated that treatment with DAL maintained redox balance, reduced MC3T3-E1 cell apoptosis, improved alkaline phosphatase activity, and elevated the osteogenic-related protein expression of Runx2, Osterix, and BMP2 against oxidative damage induced by H2O2. The potential molecular mechanism involved in the protective effect of DAL against H2O2-induced cell death in MC3T3-E1 cells may lie in the activation of the PI3K/AKT/SMAD1 cell signal pathway. Taken together, the results indicated that the potential protective effects of DAL against osteoporosis were linked to a reduction in oxidative damage, suggesting that DAL may be useful in bone metabolism diseases, particularly osteoporosis.
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Affiliation(s)
- Yu-Qin Jin
- Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, 210008, China.,Center Laboratory of Stomatology, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Jia-Ling Li
- Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, 210008, China
| | - Jin-Dong Chen
- Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, 210008, China
| | - Chang-Liang Xu
- Key Laboratory of SATCM for Empirical Formulae Evaluation and Achievements Transformation, The No. 1 Clinical Medical College, Nanjing University of Chinese Medicine, Nanjing, China
| | - Huang Li
- Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, 210008, China.
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Chen W, Shen X, Hu Y, Xu K, Ran Q, Yu Y, Dai L, Yuan Z, Huang L, Shen T, Cai K. Surface functionalization of titanium implants with chitosan-catechol conjugate for suppression of ROS-induced cells damage and improvement of osteogenesis. Biomaterials 2017; 114:82-96. [DOI: 10.1016/j.biomaterials.2016.10.055] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 10/07/2016] [Accepted: 10/31/2016] [Indexed: 12/19/2022]
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Zhang Z, Lv L. Effect of local insulin injection on wound vascularization in patients with diabetic foot ulcer. Exp Ther Med 2015; 11:397-402. [PMID: 26893621 PMCID: PMC4734220 DOI: 10.3892/etm.2015.2917] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 09/01/2015] [Indexed: 01/04/2023] Open
Abstract
The aim of the present study was to investigate the effect of local insulin injection on granulation tissue formation in the wounds of patients with diabetic foot ulcer. Thirty-two patients with diabetic foot ulcer were randomly divided into an insulin (n=18) and a control (n=14) group. In the diabetic foot ulcer wound, the insulin group were administered insulin and the control group were administered an equal volume of saline. Prior to injection and at 0.5, 1.0, 2.0 and 4.0 h after injection, the fingertip blood glucose levels were determined. The growth of granulation tissue was assessed continuously for 12 days. Wound tissue was harvested at 0, 5, 7 and 12 days for the detection of CD34 expression by immunohistochemistry. The microvessel density (MVD) was calculated. No significant difference in the fasting blood glucose level was found between the two groups at any time-point (P>0.05). Growth of granulation tissue in the insulin group was more marked from 7 days after local insulin injection (24.87±0.24) and was significantly different from that in the control group (18.66±0.45) (P<0.01). New vessels were observed in the insulin group 3 days after insulin injection; however, there was no significant difference in MVD compared with the control group (P>0.05). The MVD in the insulin group increased markedly from 5 days after treatment, and the difference between the two groups was significant (P<0.01). In conclusion, local injection of insulin into the base of a diabetic foot ulcer has a significant effect on systemic blood glucose and may promote wound healing by improving the growth of granulation tissue.
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Affiliation(s)
- Zhaoxin Zhang
- Department of Burns, People's Hospital of Xinjiang Uygur Autonomous Region, Urumchi, Xinjiang Uygur Autonomous Region 830001, P.R. China
| | - Lei Lv
- Department of Burns, People's Hospital of Xinjiang Uygur Autonomous Region, Urumchi, Xinjiang Uygur Autonomous Region 830001, P.R. China
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