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Gao Y, Huang A, Zhao Y, Du Y. PMAIP1 regulates autophagy in osteoblasts via the AMPK/mTOR pathway in osteoporosis. Hum Cell 2024; 37:1024-1038. [PMID: 38691334 DOI: 10.1007/s13577-024-01067-w] [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: 11/28/2023] [Accepted: 04/22/2024] [Indexed: 05/03/2024]
Abstract
Osteoporosis (OP) is a highly prevalent disorder characterized by low bone mass that severely reduces patient quality of life. Although numerous treatments for OP have been introduced in clinic, many have side effects and high costs. Therefore, there is still an unmet need for optimal solutions. Here, raw signal analysis was used to identify potential high-risk factors for OP, and the biological functions and possible mechanisms of action (MOAs) of these factors were explored via gene set enrichment analysis (GSEA). Subsequently, molecular biological experiments were performed to verify and analyze the discovered risk factors in vitro and in vivo. PMAIP1 was identified as a potential risk factor for OP and significantly suppressed autophagy in osteoblasts via the AMPK/mTOR pathway, thereby inhibiting the proliferation and differentiation of osteoblasts. Furthermore, we constructed an ovariectomy (OVX) model of OP in rats and simultaneously applied si-PMAIP1 for in vivo interference. si-PMAIP1 upregulated the expression of LC3B and p-AMPK and downregulated the expression of p-mTOR, and these effects were reversed by the autophagy inhibitor. Micro-CT revealed that, si-PMAIP1 significantly inhibited the development of osteoporosis in OVX model rats, and this therapeutic effect was attenuated by treatment with an autophagy inhibitor. This study explored the role and mechanism of PMAIP1 in OP and demonstrated that PMAIP1 may serve as a novel target for OP treatment.
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Affiliation(s)
- Yijie Gao
- Department of Rehabilitation Medicine, The Second Hospital of Dalian Medical University, Dalian, Liaoning, People's Republic of China
- Dalian Medical University, Dalian, Liaoning, People's Republic of China
| | - Anquan Huang
- Department of Joint Surgery, Dalian Municipal Central Hospital, Dalian, Liaoning, People's Republic of China
| | - Yantao Zhao
- Department of Joint Surgery, Dalian Municipal Central Hospital, Dalian, Liaoning, People's Republic of China.
| | - Yunxia Du
- Department of Rehabilitation Medicine, The Second Hospital of Dalian Medical University, Dalian, Liaoning, People's Republic of China.
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Trojani MC, Clavé A, Bereder I, Camuzard O, Bernard De Dompsure R, Gonzalez JF, Trojani C, Santucci-Darmanin S, Carle GF, Breuil V, Pierrefite-Carle V. Autophagy markers are decreased in bone of osteoporotic patients: a monocentric comparative study. Eur J Endocrinol 2024; 190:K27-K31. [PMID: 38430550 DOI: 10.1093/ejendo/lvae017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 02/02/2024] [Accepted: 02/06/2024] [Indexed: 03/04/2024]
Abstract
BACKGROUND Osteoporosis (OP) is a pathology characterized by bone fragility affecting 30% of postmenopausal women, mainly due to estrogen deprivation and increased oxidative stress. An autophagy involvement is suspected in OP pathogenesis but a definitive proof in humans remains to be obtained. METHODS Postmenopausal women hospitalized for femoral neck fracture (OP group) or total hip replacement (Control group) were enrolled using very strict exclusion criteria. Western blot was used to analyze autophagy level. RESULTS The protein expression level of the autophagosome marker LC3-II was significantly decreased in bone of OP patients relative to the control group. In addition, the protein expression of the hormonally upregulated neu-associated kinase (HUNK), which is upregulated by female hormones and promotes autophagy, was also significantly reduced in bone of the OP group. CONCLUSIONS These results demonstrate for the first time that postmenopausal OP patients have a deficit in bone autophagy level and suggest that HUNK could be the factor linking estrogen loss and autophagy decline. CLINICAL TRIAL REGISTRATION NUMBER ClinicalTrials.gov Identifier: NCT03175874, 2/6/2017.
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Affiliation(s)
- Marie-Charlotte Trojani
- Université Côte d'Azur, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), UMR E4320 TIRO-MATOs, 06107 Nice, France
- Service de Rhumatologie, Centre Hospitalier Universitaire de Nice, Hôpital Pasteur II, 06000 Nice, France
| | - Arnaud Clavé
- Université Côte d'Azur, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), UMR E4320 TIRO-MATOs, 06107 Nice, France
- Service de Chirurgie Orthopédique, Clinique Saint Georges, 06105 Nice, France
| | - Isabelle Bereder
- Service de Gériatrie, Centre Hospitalier Universitaire de Nice, Hôpital de Cimiez, 06000 Nice, France
| | - Olivier Camuzard
- Université Côte d'Azur, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), UMR E4320 TIRO-MATOs, 06107 Nice, France
- Service de Chirurgie Réparatrice, Centre Hospitalier Universitaire de Nice, Hôpital Pasteur II, 06000 Nice, France
| | - Régis Bernard De Dompsure
- Service de Chirurgie Orthopédique, Centre Hospitalier Universitaire de Nice, Hôpital Pasteur II, 06000 Nice, France
| | - Jean-François Gonzalez
- Service de Chirurgie Orthopédique, Centre Hospitalier Universitaire de Nice, Hôpital Pasteur II, 06000 Nice, France
| | | | - Sabine Santucci-Darmanin
- Université Côte d'Azur, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), UMR E4320 TIRO-MATOs, 06107 Nice, France
- CNRS, 75005 Paris, France
| | - Georges F Carle
- Université Côte d'Azur, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), UMR E4320 TIRO-MATOs, 06107 Nice, France
- CNRS, 75005 Paris, France
| | - Véronique Breuil
- Université Côte d'Azur, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), UMR E4320 TIRO-MATOs, 06107 Nice, France
- Service de Rhumatologie, Centre Hospitalier Universitaire de Nice, Hôpital Pasteur II, 06000 Nice, France
| | - Valérie Pierrefite-Carle
- Université Côte d'Azur, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), UMR E4320 TIRO-MATOs, 06107 Nice, France
- INSERM, 75013 Paris, France
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Azuma K, Ikeda K, Shiba S, Sato W, Horie K, Hasegawa T, Amizuka N, Tanaka S, Inoue S. EBAG9-deficient mice display decreased bone mineral density with suppressed autophagy. iScience 2024; 27:108871. [PMID: 38313054 PMCID: PMC10835455 DOI: 10.1016/j.isci.2024.108871] [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: 03/25/2023] [Revised: 11/22/2023] [Accepted: 01/08/2024] [Indexed: 02/06/2024] Open
Abstract
Estrogen receptor-binding fragment associated antigen 9 (EBAG9) exerts tumor-promoting effects by inducing immune escape. We focused on the physiological functions of EBAG9 by investigating the bone phenotypes of Ebag9-knockout mice. Female Ebag9-knockout mice have fragile bones with lower bone mineral density (BMD) compared with wild-type mice. Histomorphometric analyses demonstrated that lower BMD was mainly caused by decreased bone formation. Serum bone turnover markers showed that enhanced bone resorption also contributed to this phenotype. We revealed that EBAG9 promoted autophagy in both osteoblastic and osteoclastic lineages. In addition, the knockdown of Tm9sf1, a gene encoding a protein that functionally interacts with EBAG9, suppressed autophagy and osteoblastic differentiation of the murine preosteoblastic cell line MC3T3-E1. Finally, overexpression of TM9SF1 rescued the suppression of autophagy caused by the silencing of Ebag9. These results suggest that EBAG9 plays a physiological role in bone maintenance by promoting autophagy together with its interactor TM9SF1.
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Affiliation(s)
- Kotaro Azuma
- Department of Systems Aging Science and Medicine, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Itabashi-ku, Tokyo 173-0015, Japan
- Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Kazuhiro Ikeda
- Division of Systems Medicine and Gene Therapy, Saitama Medical University, Hidaka, Saitama 350-1241, Japan
| | - Sachiko Shiba
- Division of Systems Medicine and Gene Therapy, Saitama Medical University, Hidaka, Saitama 350-1241, Japan
| | - Wataru Sato
- Division of Systems Medicine and Gene Therapy, Saitama Medical University, Hidaka, Saitama 350-1241, Japan
| | - Kuniko Horie
- Division of Systems Medicine and Gene Therapy, Saitama Medical University, Hidaka, Saitama 350-1241, Japan
| | - Tomoka Hasegawa
- Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Hokkaido 060-8586, Japan
| | - Norio Amizuka
- Department of Developmental Biology of Hard Tissue, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Hokkaido 060-8586, Japan
| | - Shinya Tanaka
- Department of Orthopedic Surgery, Saitama Medical University, Moroyama, Saitama 350-0495, Japan
- Department of Orthopedic Surgery, Japan Community Health Care Organization Saitama Northern Medical Center, Saitama, Saitama 331-8625, Japan
| | - Satoshi Inoue
- Department of Systems Aging Science and Medicine, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Itabashi-ku, Tokyo 173-0015, Japan
- Division of Systems Medicine and Gene Therapy, Saitama Medical University, Hidaka, Saitama 350-1241, Japan
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Xue H, Feng Z, Yuan P, Qiao L, Lou Q, Zhao X, Ma Q, Wang S, Shen Y, Ye H, Cheng J, Wang J, Wan S, Zhang B, Shi P, Sun X. Restrained Mitf-associated autophagy by Mulberroside A ameliorates osteoclastogenesis and counteracts OVX-Induced osteoporosis in mice. Cell Death Discov 2024; 10:80. [PMID: 38360705 PMCID: PMC10869803 DOI: 10.1038/s41420-024-01847-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 01/28/2024] [Accepted: 02/02/2024] [Indexed: 02/17/2024] Open
Abstract
Bone and mineral metabolism homeostasis accounts for the maintenance of normal skeletal remodeling. However, with aging and changes in hormone levels, over-activated osteoclasts disrupt homeostasis, induce osteoporosis, and even cause osteoporotic fractures, leading to an enormous economic burden. Despite the rapid development of pharmacological therapy for osteoporosis, safer and more effective treatments remain to be explored. Here, we demonstrate that Mulberroside A (Mul-A), a natural component extracted from mulberry bark and branches, effectively suppresses osteoclastogenesis in vitro and counteracts bone loss caused by ovariectomy (OVX). The mechanism underlying this effect involves the repression of autophagic flux during osteoclastogenesis by Mul-A, which can be attributed to the restrained expression of microphthalmia-related transcription factor (Mitf) and its nuclear translocation. Importantly, Mitf overexpression partially reverses the inhibitory effects of Mul-A on autophagy and osteoclastogenesis. Moreover, applying two autophagy agonizts, rapamycin and Torin 1, attenuates the osteoclastogenic regulatory role of Mul-A. Collectively, our study demonstrates that Mul-A damages osteoclast differentiation and ameliorates osteoporosis caused by estrogen deficiency by modulation of Mitf-associated autophagy, indicating its therapeutic potential against osteoporosis.
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Affiliation(s)
- Hong Xue
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Zhenhua Feng
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Putao Yuan
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Li Qiao
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Qiliang Lou
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Xiangde Zhao
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Qingliang Ma
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Shiyu Wang
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Yang Shen
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Huali Ye
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Jiao Cheng
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Jiying Wang
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Shuanglin Wan
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Boya Zhang
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China
| | - Peihua Shi
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
| | - Xuewu Sun
- Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.
- Key Laboratory of Musculoskeletal System Degeneration and Regeneration Translational Research of Zhejiang Province, Hangzhou, China.
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Cheng T, Zhang YC, Fan KY, Hu JX, Wang Q, Wang Q, Liu L, Zhang HY, Hou YP, Li XF, Zhang SX. Genetic Evidence Supporting a Causal Association Between mTOR-Dependent EIF-4E Circulating Protein Level and Osteoporosis. Adv Ther 2023; 40:4987-4998. [PMID: 37728694 DOI: 10.1007/s12325-023-02676-x] [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: 07/24/2023] [Accepted: 08/31/2023] [Indexed: 09/21/2023]
Abstract
INTRODUCTION The mechanistic target of rapamycin (mTOR) regulates bone homeostasis, a crucial factor in osteoporosis (OP) development. However, most research is based on observational studies, and the causality remains uncertain. Therefore, we analyzed two samples of mendelian randomization (MR) to determine whether there is a causal relationship between mTOR-dependent circulating proteins and OP. METHODS Mendelian weighting (weighted median [WM], inverse variance weighting [IVW], and MR-Egger regression) were applied to analyze the causality between bone phenotypes (bone mineral density [BMD] in forearm, femoral neck, lumbar spine, and heel) and mTOR-dependent circulating proteins (RP-S6K, 4EBP, EIF-4E, EIF-4A, and EIF-4G). Horizontal pleiotropy and heterogeneities were detected using Cochran's Q test, MR-Pleiotropy RE-Sidual Sum and Outlier (MR-PRESSO), and "leave-one-out" analysis. The proteomics-GWAS INTERVAL study was used to select the instrumental variables (IVs) for mTOR proteins. RESULTS As phenotypes for OP, estimations of BMD were taken in four different sites: forearm (FA) (n = 8143), femoral neck (FN) (n = 32,735), lumbar spine (LS) (n = 28,498), and heel (eBMD) (n = 426,824). Based on IVW analysis, EIF4E is causally related to FA-BMD (OR = 0.938, 95% CI 0.887, 0.991, p = 0.024) but not to BMD elsewhere. CONCLUSION MR analysis revealed a causal relationship between EIF-4E and FA-BMD, which may provide new insights into the underlying pathogenesis of OP and a new therapeutic target for OP.
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Affiliation(s)
- Ting Cheng
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi, China
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - Yao-Chen Zhang
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - Ke-Yi Fan
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - Jing-Xi Hu
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - Qian Wang
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - Qi Wang
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
- School of Basic Medical Sciences, Shanxi Medical University, Taiyuan, China
- Shanxi Key Laboratory of Big Data for Clinical Decision Research, Taiyuan, China
| | - Liu Liu
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - He-Yi Zhang
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - Yao-Pu Hou
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - Xiao-Feng Li
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi, China
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China
| | - Sheng-Xiao Zhang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, Taiyuan, Shanxi, China.
- Shanxi Provincial Key Laboratory of Rheumatism Immune Microecology, Taiyuan, Shanxi, China.
- Key Laboratory of Cellular Physiology at Shanxi Medical University, Ministry of Education, Taiyuan, Shanxi, China.
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Yang YY, Soh R, Vera-Colón M, Huang M, Zur Nieden NI, Wang Y. Targeted Proteomic Profiling Revealed Roles of Small GTPases during Osteogenic Differentiation. Anal Chem 2023; 95:6879-6887. [PMID: 37083350 PMCID: PMC10290900 DOI: 10.1021/acs.analchem.2c05781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
The small GTPase superfamily of proteins are crucial for numerous cellular processes, including early development. The roles of these proteins in osteogenic differentiation, however, remained poorly explored. In this study, we employed a high-throughput targeted proteomic method, relying on scheduled liquid chromatography-multiple-reaction monitoring (LC-MRM) coupled with synthetic stable isotope-labeled peptides, to interrogate systematically the temporal responses of the entire small GTPase proteome during the course of osteogenic differentiation of H9 human embryonic stem cells. Our results demonstrated that the method offers high quantification accuracy, reproducibility, and throughput. In addition, the quantification results revealed altered expression of a large number of small GTPases accompanied with osteogenic differentiation, especially those involved with autophagy. We also documented a previously unrecognized role of KRAS in osteogenesis, where it regulates the accumulation of extracellular matrix for mineralization through attenuating the activity of secreted matrix metalloproteinase 9 (MMP9). Together, this study represents a novel application of a state-of-the-art analytical method, i.e., targeted quantitative proteomics, for revealing the progressive reprogramming of the small GTPase proteome during osteogenic differentiation of human embryonic stem cells, and our results revealed KRAS as a new regulator for osteogenesis.
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Affiliation(s)
- Yen-Yu Yang
- Department of Chemistry, University of California, Riverside, Riverside, California 92521-0403, United States
| | - Ruthia Soh
- Department of Molecular, Cell, and Systems Biology, University of California, Riverside, Riverside, California 92521-0403, United States
| | - Madeline Vera-Colón
- Environmental Toxicology Graduate Program, University of California, Riverside, Riverside, California 92521-0403, United States
| | - Ming Huang
- Environmental Toxicology Graduate Program, University of California, Riverside, Riverside, California 92521-0403, United States
| | - Nicole I Zur Nieden
- Department of Molecular, Cell, and Systems Biology, University of California, Riverside, Riverside, California 92521-0403, United States
- Environmental Toxicology Graduate Program, University of California, Riverside, Riverside, California 92521-0403, United States
| | - Yinsheng Wang
- Department of Chemistry, University of California, Riverside, Riverside, California 92521-0403, United States
- Environmental Toxicology Graduate Program, University of California, Riverside, Riverside, California 92521-0403, United States
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Jiang Y, Luo W, Zhou F, Gong P, Xiong Y. The role of FOXO1-mediated autophagy in the regulation of bone formation. Cell Cycle 2023; 22:829-840. [PMID: 36510368 PMCID: PMC10026867 DOI: 10.1080/15384101.2022.2155443] [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] [Indexed: 12/15/2022] Open
Abstract
Autophagy is essential for the maintenance of intracellular homeostasis, implicated in various biological processes. Forkhead box protein O1 (FOXO1) is regarded as a key mediator regulating skeletal development. Recent studies indicate that FOXO1 has a multifaceted role in autophagy regulation and dysregulation. Here, we aimed to elucidate the role of FOXO1-autophagy axis in osteogenesis. Osteoblast conditional Foxo1-knockout mice (Foxo1OB-/-, KO) and FOXO1 lentivirus overexpression (Len-FoxO1) model were constructed in vivo. Primary osteoblasts were isolated from KO and their wild-type (WT) littermates. And we also applied overexpression lentivirus to investigate the effects of FOXO1 in vitro. Using Micro-CT, fluorescence labeling detection, real-time qPCR and western blot analyses, we found that bone formation was promoted in Len-FOXO1 mice, which was impaired in KO group. Similarly, FOXO1 overexpression enhanced proliferation, migration and differentiation of osteoblasts, while FOXO1 ablation resulted in poor biological functions of osteoblasts. Through the investigation of autophagic process using mRFP-GFP-LC3 fluorescence labeling and co-immunoprecipitation, we observed that overexpression of FOXO1 initiated autophagy induction, with enhanced FOXO1 interaction with autophagy-related protein 7 (ATG7). On the contrary, FOXO1 knockout in osteoblasts impeded FOXO1-ATG7 conjugation, leading to impaired autophagic activity. Furthermore, inhibition of autophagy by chloroquine (CQ) could reverse favorable influences in bone formation induced by FOXO1 overexpression. Our findings confirmed that FOXO1 was an important regulator of bone formation and autophagy might be part of the underlying mechanisms, offering a significant avenue for the potential strategy in the treatment of bone-related disorders.
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Affiliation(s)
- Yixuan Jiang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Wenqiong Luo
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Feng Zhou
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Ping Gong
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Yi Xiong
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu, China
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8
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Yun H, Kim B, Jeong YH, Hong JT, Park K. Suffruticosol A elevates osteoblast differentiation targeting BMP2-Smad/1/5/8-RUNX2 in pre-osteoblasts. Biofactors 2023; 49:127-139. [PMID: 35852295 PMCID: PMC10947220 DOI: 10.1002/biof.1878] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 07/03/2022] [Indexed: 11/11/2022]
Abstract
The Paeonia suffruticosa ANDR. (P. suffruticosa) is commonly used in traditional medicine for various purposes. Suffruticosol A (Suf-A), isolated from P. suffruticosa, is a beneficial compound with antibiofilm, antivirulence, and anti-inflammatory properties. The aim of the present study was to investigate the biological effects of Suf-A on osteogenic processes in pre-osteoblasts. It was determined here in that Suf-A (>98.02%), isolated from P. suffruticosa, showed no cytotoxicity at 0.1-30 μM; however, it induced cytotoxicity at 50-100 μM in pre-osteoblasts. Suf-A increased osteogenic alkaline phosphatase activity and expression levels of noncollagenous proteins. Adhesion and trans-migration on the extracellular matrix were potentiated by Suf-A, but not by wound-healing migration. Suf-A did not affect autophagy or necroptosis during osteoblast differentiation. We found that Suf-A increased runt-related transcription factor 2 (RUNX2) levels and mineralized matrix formation. RUNX2 expression was mediated by Suf-A-induced BMP2-Smad1/5/8 and mitogen-activated protein kinase signaling, as demonstrated by Noggin, a BMP2 inhibitor. These results suggest that Suf-A is a potential natural osteogenic compound.
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Affiliation(s)
- Hyung‐Mun Yun
- Department of Oral and Maxillofacial PathologySchool of Dentistry, Kyung Hee UniversitySeoulRepublic of Korea
| | - Bomi Kim
- National Development Institute of Korean MedicineGyeongsanRepublic of Korea
| | - Yun Hee Jeong
- National Development Institute of Korean MedicineGyeongsanRepublic of Korea
| | - Jin Tae Hong
- College of Pharmacy and Medical Research Center, Chungbuk National UniversityChungbukRepublic of Korea
| | - Kyung‐Ran Park
- Gwangju CenterKorea Basic Science Institute (KBSI)GwangjuRepublic of Korea
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Zhu S, Liu J, Zhao J, Zhou B, Zhang Y, Wang H. HIF-1α-mediated autophagy and canonical Wnt/β-catenin signalling activation are involved in fluoride-induced osteosclerosis in rats. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 315:120396. [PMID: 36220573 DOI: 10.1016/j.envpol.2022.120396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 09/23/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
Abstract
Fluoride (F) exposure can cause osteosclerosis, which is characterised by a high bone mass, but its mechanism is not fully illustrated. Here, we aimed to evaluate the effects of excessive F exposure on the bone lesion by treating female Sprague-Dawley rats with different concentrations of sodium fluoride (NaF) (0, 55, 110 and 221 mg/L) for 90 days and the corresponding concentrations of fluorine ion (0, 25, 50 and 100 mg/L, respectively). Histopathological results showed that excessive F exposure caused the enlargement of trabeculae and their integration into one large piece, growth plate thickening, articular cartilage impairment and bone collagen abnormality. Meanwhile, F promoted calcium deposition and bone mineralisation, and induced abnormal osteogenesis increased. The results of micro-computed tomography also confirmed that excessive F destroyed the bone microstructure and induced a high-bone-mass phenotype, consistent with the results of pathomorphology. Mechanistically, excessive amounts of F led to angiogenesis inhibition and HIF-1α signalling enhancement. Subsequently, F induced autophagy and canonical Wnt/β-catenin signalling pathway activation. Collectively, these results manifested that F enhanced the hypoxia inducible factor-1α signalling, which in turn triggered autophagy and canonical Wnt/β-catenin signalling activation, ultimately leading to osteosclerosis in the rats.
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Affiliation(s)
- Shiquan Zhu
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Jing Liu
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Jing Zhao
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Bianhua Zhou
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Yuling Zhang
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
| | - Hongwei Wang
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang, 471000, Henan, People's Republic of China.
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10
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Yang C, Tao H, Zhang H, Xia Y, Bai J, Ge G, Li W, Zhang W, Xiao L, Xu Y, Wang Z, Gu Y, Yang H, Liu Y, Geng D. TET2 regulates osteoclastogenesis by modulating autophagy in OVX-induced bone loss. Autophagy 2022; 18:2817-2829. [PMID: 35255774 PMCID: PMC9673923 DOI: 10.1080/15548627.2022.2048432] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Increased bone resorption by osteoclasts after estrogen deficiency is the main cause of postmenopausal osteoporosis. TET2 (tet methylcytosine dioxygenase 2) is a DNA demethylase that regulates cellular function and differentiation potential. Macroautophagy/autophagy maintains cellular homeostasis by recycling unnecessary and damaged organelles. This study revealed that TET2 promoted bone loss in oophorectomized (OVX) mice and that TET2 promoted osteoclast differentiation by regulating autophagy. Tet2 knockdown inhibited autophagy and osteoclast differentiation in vitro. Mechanistically, Tet2 knockdown increased BCL2 (B cell leukemia/lymphoma 2) expression and BCL2 exhibited increased binding to BECN1 and negatively regulated autophagy. Small interfering RNA specific to Bcl2 interfered with BCL2 expression in Tet2-knockdown bone marrow cells/precursors, partially reversing autophagy dysregulation and promoting osteoclast differentiation. Moreover, the LV-shTet2 lentivirus prevented bone loss in OVX mice. In summary, our findings provide evidence that TET2 promotes osteoclast differentiation by inhibiting BCL2 expression and positively regulating BECN1-dependent autophagy.Abbreviations: ACP5/TRAP: acid phosphatase 5, tartrate resistant; ATP6V0D2: ATPase, H+ transporting, lysosomal V0 subunit D2; BCL2: B cell leukemia/lymphoma 2; BECN1: beclin 1, autophagy related; BMs: bone marrow cells; CTSK: cathepsin K; MAP1LC3B/LC3B: microtubule-associated protein 1 light chain 3 beta; MMP9: matrix metallopeptidase 9; OVX: oophorectomy; RUNX1: runt related transcription factor 1; SOCS3: suppressor of cytokine signaling 3; SPI1/PU.1: Spi-1 proto-oncogene; TNFSF11/RANKL: tumor necrosis factor (ligand) superfamily, member 11; TET2: tet methylcytosine dioxygenase 2.
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Affiliation(s)
- Chen Yang
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Huaqiang Tao
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
- CONTACT Jiaxiang Bai Department of Orthopedics, The First Affiliated Hospital of Soochow University, No. 188 Shizi StreetSuzhou, Jiangsu, 215006, China
| | - Haifeng Zhang
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
- Dechun Geng
| | - Yu Xia
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
- Huilin Yang
| | - Jiaxiang Bai
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
- Yu Liu Department of Orthopedics, Wuxi Ninth People’s Hospital Affiliated to Soochow University, Wuxi, Jiangsu214062, China
| | - Gaoran Ge
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Wenming Li
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Wei Zhang
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Long Xiao
- Department of Orthopedics, Zhangjiagang Tcm Hospital Affiliated to Nanjing University of Chinese Medicine, Zhangjiagang, Jiangsu, China
| | - Yaozeng Xu
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Zhirong Wang
- Department of Orthopedics, Zhangjiagang Tcm Hospital Affiliated to Nanjing University of Chinese Medicine, Zhangjiagang, Jiangsu, China
| | - Ye Gu
- Department of Orthopedics, Central Laboratory, Changshu Hospital Affiliated to Soochow University, First People’s Hospital of Changshu City, Changshu, Jiangsu, China
| | - Huilin Yang
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
| | - Yu Liu
- Department of Orthopedics, Wuxi Ninth People’s Hospital Affiliated to Soochow University, Wuxi, Jiangsu, China
| | - Dechun Geng
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China
- Department of Orthopedics, Central Laboratory, Changshu Hospital Affiliated to Soochow University, First People’s Hospital of Changshu City, Changshu, Jiangsu, China
- Dechun Geng
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11
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Xing L, Li Y, Li W, Liu R, Geng Y, Ma W, Qiao Y, Li J, Lv Y, Fang Y, Xu P. Expression of RUNX2/LAPTM5 in the Induction of MC3T3-e1 Mineralization and Its Possible Relationship with Autophagy. Tissue Eng Regen Med 2022; 19:1223-1235. [PMID: 36121636 PMCID: PMC9679133 DOI: 10.1007/s13770-022-00477-x] [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: 02/22/2022] [Revised: 04/13/2022] [Accepted: 06/27/2022] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND The study aims to correlate osteogenesis with autophagy during the mineralization induction of MC3T3-e1 through exploring the expression of runt-related transcription factor 2 (RUNX2)/lysosomal-associated transmembrane protein 5 (LAMPT5). METHODS The induction of mineralization in MC3T3-e1 was followed by detecting the expressions of osteogenesis-related indexes such as RUNX2, alkaline phosphatase (ALP), osteocalcin (OCN), and LAPTM5 using RT-qPCR and Western blot from 0 to 14 days. Transmission electron microscope was utilised in visualizing the alterations of autophagosomes, which was followed by immunofluorescence detecting the subcellular localization of autophagy-related index sequestosome 1 (P62) and microtubule-associated protein 1 light 3 (LC3) protein and scrutinising the expression of P62 mRNA and P62 and LC3 proteins. RESULTS Induction of MC3T3-e1 mineralization demonstrated an increased expression of osteogenesis-related indicators such as RUNX2, ALP, OCN, and LAPTM5 (p < 0.05), as evident from the results of RT-qPCR and Western blot. Meanwhile, the expression of autophagosomes increased one day after mineralization induction and then experienced a gradual decline, and enhanced expression of LC3 protein was noted on days 1-2 of mineralization induction but was then followed by a corresponding reduce. In contrast, a continuous increase was reported in the expression of P62 mRNA and protein, respectively (p < 0.05). Up- and down-regulating RUNX2/LAPTM5 expression alone confirmed the aforementioned results. CONCLUSION It was therefore proposed that RUNX2 may be responsible for an early increase and then a gradual decrease in LAPTM5-mediated autophagy through the regulation of its high expression. Meanwhile, increased LAPTM5 expression in osteogenic mineralization presumed that RUNX2/LAPTM5 promoted autophagy and osteogenic expression, which may play a bridging role in the regulation of autophagy and osteogenesis.
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Affiliation(s)
- Lei Xing
- Department of Dental Implantology, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, 510150, China
- Stomatological Hospital, Southern Medical University, Guangzhou, China
| | - Yanqin Li
- South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
| | - Wenhao Li
- Stomatological Hospital, Southern Medical University, Guangzhou, China
| | - Rong Liu
- Department of Dental Implantology, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, 510150, China
| | - Yuanming Geng
- Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Weiqun Ma
- Stomatological Hospital, Southern Medical University, Guangzhou, China
| | - Yu Qiao
- Department of Dental Implantology, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, 510150, China
| | - Jianwen Li
- Department of Dental Implantology, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, 510150, China
| | - Yingtao Lv
- Stomatological Hospital, Southern Medical University, Guangzhou, China
| | - Ying Fang
- Department of Dental Implantology, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, 510150, China.
| | - Pingping Xu
- Stomatological Hospital, Southern Medical University, Guangzhou, China.
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12
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Yoshida G, Kawabata T, Takamatsu H, Saita S, Nakamura S, Nishikawa K, Fujiwara M, Enokidani Y, Yamamuro T, Tabata K, Hamasaki M, Ishii M, Kumanogoh A, Yoshimori T. Degradation of the NOTCH intracellular domain by elevated autophagy in osteoblasts promotes osteoblast differentiation and alleviates osteoporosis. Autophagy 2022; 18:2323-2332. [PMID: 35025696 PMCID: PMC9542956 DOI: 10.1080/15548627.2021.2017587] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Maintenance of bone integrity is mediated by the balanced actions of osteoblasts and osteoclasts. Because macroautophagy/autophagy regulates osteoblast mineralization, osteoclast differentiation, and their secretion from osteoclast cells, autophagy deficiency in osteoblasts or osteoclasts can disrupt this balance. However, it remains unclear whether upregulation of autophagy becomes beneficial for suppression of bone-associated diseases. In this study, we found that genetic upregulation of autophagy in osteoblasts facilitated bone formation. We generated mice in which autophagy was specifically upregulated in osteoblasts by deleting the gene encoding RUBCN/Rubicon, a negative regulator of autophagy. The rubcnflox/flox;Sp7/Osterix-Cre mice showed progressive skeletal abnormalities in femur bones. Consistent with this, RUBCN deficiency in osteoblasts resulted in elevated differentiation and mineralization, as well as an increase in the elevated expression of key transcription factors involved in osteoblast function such as Runx2 and Bglap/Osteocalcin. Furthermore, RUBCN deficiency in osteoblasts accelerated autophagic degradation of NOTCH intracellular domain (NICD) and downregulated the NOTCH signaling pathway, which negatively regulates osteoblast differentiation. Notably, osteoblast-specific deletion of RUBCN alleviated the phenotype in a mouse model of osteoporosis. We conclude that RUBCN is a key regulator of bone homeostasis. On the basis of these findings, we propose that medications targeting RUBCN or autophagic degradation of NICD could be used to treat age-related osteoporosis and bone fracture.Abbreviations: ALPL: alkaline phosphatase, liver/bone/kidney; BCIP/NBT: 5-bromo-4-chloro-3'-indolyl phosphate/nitro blue tetrazolium; BMD: bone mineral density; BV/TV: bone volume/total bone volume; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; MTOR: mechanistic target of rapamycin kinase; NICD: NOTCH intracellular domain; RB1CC1/FIP200: RB1-inducible coiled-coil 1; RUBCN/Rubicon: RUN domain and cysteine-rich domain containing, Beclin 1-interacting protein; SERM: selective estrogen receptor modulator; TNFRSF11B/OCIF: tumor necrosis factor receptor superfamily, member 11b (osteoprotegerin).
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Affiliation(s)
- Gota Yoshida
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Tsuyoshi Kawabata
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Stem Cell Biology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Hyota Takamatsu
- Department of Respiratory Medicine, Allergy and Rheumatic Disease, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Shotaro Saita
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Shuhei Nakamura
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Keizo Nishikawa
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan,Faculty of Life and Medical Sciences, Department of Medical Life Systems, Doshisha University, Kyoto, Japan
| | - Mari Fujiwara
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Yusuke Enokidani
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Tadashi Yamamuro
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Keisuke Tabata
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Maho Hamasaki
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
| | - Masaru Ishii
- Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan
| | - Atsushi Kumanogoh
- Department of Respiratory Medicine, Allergy and Rheumatic Disease, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Tamotsu Yoshimori
- Department of Genetics, Graduate School of Medicine, Osaka University, Osaka, Japan,Department of Intracellular Membrane Dynamics, Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan,CONTACT Tamotsu Yoshimori Osaka University, Osaka, Japan
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13
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Zhang L, Zheng YL, Wang R, Wang XQ, Zhang H. Exercise for osteoporosis: A literature review of pathology and mechanism. Front Immunol 2022; 13:1005665. [PMID: 36164342 PMCID: PMC9509020 DOI: 10.3389/fimmu.2022.1005665] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 08/18/2022] [Indexed: 11/13/2022] Open
Abstract
Osteoporosis (OP) is a disease that weakens bones and has a high morbidity rate worldwide, which is prevalent among the elderly, particularly, women of postmenopausal age. The dynamic balance between bone formation and resorption is necessary for normal bone metabolism. Many factors, including aging, estrogen deficiency, and prolonged immobilization, disrupt normal apoptosis, autophagy, and inflammation, leading to abnormal activation of osteoclasts, which gradually overwhelm bone formation by bone resorption. Moderate exercise as an effective non-drug treatment helps increase bone formation and helps relieve OP. The possible mechanisms are that exercise affects apoptosis and autophagy through the release of exercise-stimulated myohormone and the secretion of anti-inflammatory cytokines via mechanical force. In addition, exercise may also have an impact on the epigenetic processes involved in bone metabolism. Mechanical stimulation promotes bone marrow mesenchymal stem cells (BMSCs) to osteogenic differentiation by altering the expression of non-coding RNAs. Besides, by reducing DNA methylation, the mechanical stimulus can also alter the epigenetic status of osteogenic genes and show associated increased expression. In this review, we reviewed the possible pathological mechanisms of OP and summarized the effects of exercise on bone metabolism, and the mechanisms by which exercise alleviates the progression of OP, to provide a reference for the prevention and treatment of OP.
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Affiliation(s)
- Lin Zhang
- Department of Sport Rehabilitation, Shanghai University of Sport, Shanghai, China
| | - Yi-Li Zheng
- Department of Sport Rehabilitation, Shanghai University of Sport, Shanghai, China
| | - Rui Wang
- Department of Sport Rehabilitation, Shanghai University of Sport, Shanghai, China
| | - Xue-Qiang Wang
- Department of Sport Rehabilitation, Shanghai University of Sport, Shanghai, China
- Department of Rehabilitation Medicine, Shanghai Shangti Orthopaedic Hospital, Shanghai, China
- *Correspondence: Xue-Qiang Wang, ; Hao Zhang,
| | - Hao Zhang
- Department of Orthopedics, Changhai Hospital Affiliated to the Navy Military Medical University, Shanghai, China
- *Correspondence: Xue-Qiang Wang, ; Hao Zhang,
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14
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Doxorubicin Induces Bone Loss by Increasing Autophagy through a Mitochondrial ROS/TRPML1/TFEB Axis in Osteoclasts. Antioxidants (Basel) 2022; 11:antiox11081476. [PMID: 36009195 PMCID: PMC9404930 DOI: 10.3390/antiox11081476] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/20/2022] [Accepted: 07/25/2022] [Indexed: 12/10/2022] Open
Abstract
Doxorubicin (DOX), a widely used chemotherapeutic agent, has been linked to an increased risk of bone damage in human patients and induces bone loss in mice. DOX induces autophagy, which contributes to bone homeostasis and excess autophagy in osteoclasts (OCs), resulting in bone loss. We hypothesized that DOX-induced bone loss is caused by the induction of autophagy in OCs. In vitro, DOX significantly increased the area of OCs and bone resorption activity, whereas it decreased OC number through apoptosis. DOX enhanced the level of LC3II and acidic vesicular organelles-containing cells in OCs, whereas an autophagy inhibitor, 3-methyladenine (3-MA), reversed these, indicating that enhanced autophagy was responsible for the effects of DOX. Increased mitochondrial reactive oxygen species (mROS) by DOX oxidized transient receptor potential mucolipin 1 (TRPML1) on the lysosomal membrane, which led to nuclear localization of transcription factor EB (TFEB), an autophagy-inducing transcription factor. In vivo, micro-computerized tomography analysis revealed that the injection of 3-MA reversed DOX-induced bone loss, and tartrate-resistant acid phosphatase staining showed that 3-MA reduced the area of OCs on the bone surface, which was enhanced upon DOX administration. Collectively, DOX-induced bone loss is at least partly attributable to autophagy upregulation in OCs via an mROS/TRPML1/TFEB axis.
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15
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Park KR, Kim B, Lee JY, Moon HJ, Kwon IK, Yun HM. Effects of Scoparone on differentiation, adhesion, migration, autophagy and mineralization through the osteogenic signalling pathways. J Cell Mol Med 2022; 26:4520-4529. [PMID: 35796406 PMCID: PMC9357629 DOI: 10.1111/jcmm.17476] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 05/30/2022] [Accepted: 06/15/2022] [Indexed: 12/18/2022] Open
Abstract
Scoparone (SCOP), an active and efficient coumarin compound derived from Artemisia capillaris Thunb, has been used as a traditional Chinese herbal medicine. Herein, we investigated the effects of SCOP on the osteogenic processes using MC3T3‐E1 pre‐osteoblasts in in vitro cell systems. SCOP (C11H10O4, > 99.17%) was purified and identified from A. capillaries. SCOP (0.1 to 100 μM concentrations) did not have cytotoxic effects in pre‐osteoblasts; however, it promoted alkaline phosphatase (ALP) staining and activity, and mineralized nodule formation under early and late osteogenic induction. SCOP elevated osteogenic signals through the bone morphogenetic protein 2 (BMP2)‐Smad1/5/8 pathway, leading to the increased expression of runt‐related transcription factor 2 (RUNX2) with its target protein, matrix metallopeptidase 13 (MMP13). SCOP also induced the non‐canonical BMP2‐MAPKs pathway, but not the Wnt3a‐β‐catenin pathway. Moreover, SCOP promoted autophagy, migration and adhesion under the osteogenic induction. Overall, the findings of this study demonstrated that SCOP has osteogenic effects associated with cell differentiation, adhesion, migration, autophagy and mineralization.
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Affiliation(s)
- Kyung-Ran Park
- Gwangju Center, Korea Basic Science Institute (KBSI), Gwangju, Korea
| | - Bomi Kim
- National Development Institute of Korean Medicine, Gyeongsan, Korea
| | - Joon Yeop Lee
- National Development Institute of Korean Medicine, Gyeongsan, Korea
| | - Ho-Jin Moon
- Department of Dental Materials, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Il Keun Kwon
- Department of Dental Materials, School of Dentistry, Kyung Hee University, Seoul, Korea.,Medical Device Research Center, Medical Science Research Institute, Kyung Hee University Medical Center, Seoul, Korea
| | - Hyung-Mun Yun
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul, Korea
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16
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Ma Y, Di R, Zhao H, Song R, Zou H, Liu Z. P2X7 receptor knockdown suppresses osteoclast differentiation by inhibiting autophagy and Ca 2+/calcineurin signaling. Mol Med Rep 2022; 25:160. [PMID: 35266012 PMCID: PMC8941524 DOI: 10.3892/mmr.2022.12677] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 01/11/2022] [Indexed: 11/06/2022] Open
Abstract
Bone is continuously remodeled in a dynamic process maintained by osteoclasts and osteoblasts, and imbalances in the relative activities of these cell types can cause various pathological conditions, including rheumatoid arthritis and osteoporosis. Osteoclasts are multinucleated cells that serve an important role in regulating the development of osteoporosis. Furthermore, P2X7 receptor activation has a vital role in physiological and pathological reactions in bone, including bone disease. Therefore, the present study aimed to investigate the effect of P2X7 receptor on osteoclast differentiation and to explore the underlying molecular mechanism by western blotting and tartrate‑resistant acid phosphatase staining. The results indicated that the expression levels of P2X7 receptor and intracellular Ca2+ concentration levels were very high in mature osteoclasts. Furthermore, P2X7 receptor overexpression increased the number of multinucleated osteoclasts and the expression of osteoclastogenesis‑related proteins. P2X7 receptor overexpression was also associated with downstream activation of Ca2+/calcineurin/nuclear factor of activated T cells c1 (NFATc1) signaling and increased expression of autophagy‑related proteins during osteoclast differentiation. By contrast, knockdown of P2X7 receptor exerted the opposite effects. Notably, FK506 (a Ca2+/calcineurin/NFATc1 signaling inhibitor) abrogated P2X7 receptor overexpression‑induced osteoclast differentiation and activation of autophagy. Moreover, 3‑MA (an autophagy inhibitor) significantly suppressed P2X7 receptor overexpression‑induced osteoclast differentiation. In conclusion, P2X7 receptor knockdown may suppress osteoclast differentiation by modulating autophagy and the Ca2+/calcineurin/NFATc1 signaling pathway.
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Affiliation(s)
- Yonggang Ma
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Ran Di
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Hongyan Zhao
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Ruilong Song
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Hui Zou
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
| | - Zongping Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu 225009, P.R. China
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17
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Chiu HW, Hou YC, Lu CL, Lu KC, Liu WC, Shyu JF, Chang JF, Zheng CM. Cinacalcet Improves Bone Parameters Through Regulation of Osteoclast Endoplasmic Reticulum Stress, Autophagy, and Apoptotic Pathways in Chronic Kidney Disease-Mineral and Bone Disorder. J Bone Miner Res 2022; 37:215-225. [PMID: 34633122 DOI: 10.1002/jbmr.4459] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 09/13/2021] [Accepted: 10/02/2021] [Indexed: 12/13/2022]
Abstract
The possible mechanisms underlying the quantitative and qualitative effects of cinacalcet on bone were explored in a chronic kidney disease-mineral and bone disorder (CKD-MBD) mouse model in relation to the influence of the interactions among the osteoclast (OC) endoplasmic reticulum (ER) stress, autophagy and apoptosis pathways on OC differentiation. Body weight and biochemical parameters improved significantly in the CKD + cinacalcet groups compared to the CKD group. Micro-computed tomography (μCT) revealed both cortical and trabecular parameters deteriorated significantly in the CKD group and were reversed by cinacalcet in a dose-dependent manner. Nanoindentation analysis of bone quality proved that both cortical hardness and elastic modulus improved significantly with high dose cinacalcet treatment. In vitro studies revealed that cinacalcet inhibited receptor activator of NF-κB ligand (RANKL)/receptor activator of NF-κB (RANK)-induced OC differentiation in a concentration-dependent manner through a close interaction between activation of caspase-related apoptosis, reversal of OC autophagy through the protein kinase B (Akt)/mammalian target of rapamycin (mTOR) and adenosine monophosphate-activated protein kinase (AMPK) pathways, and attenuation of the OC ER stress/CREBH/NFATc1 signaling pathway. Cinacalcet improves both bone quantity and bone quality in CKD mouse model and inhibits OC differentiation through regulation of the interactions among the apoptosis, ER stress, and autophagy pathways within OCs. © 2021 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Hui-Wen Chiu
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan.,TMU Research Centre of Urology and Kidney, Taipei Medical University, Taipei, Taiwan.,Department of Medical Research, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan
| | - Yi-Chou Hou
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Division of Nephrology, Department of Medicine, Cardinal-Tien Hospital, New Taipei City, Taiwan.,School of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan
| | - Chien-Lin Lu
- School of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan.,Division of Nephrology, Department of Medicine, Fu-Jen Catholic University Hospital, New Taipei City, Taiwan
| | - Kuo-Cheng Lu
- School of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan.,Division of Nephrology, Department of Medicine, Fu-Jen Catholic University Hospital, New Taipei City, Taiwan.,Division of Nephrology, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, and School of Medicine, Buddhist Tzu Chi University, Hualien, Taiwan
| | - Wen-Chih Liu
- Division of Nephrology, Department of Internal Medicine, Taipei Hospital, Ministry of Health and Welfare, New Taipei City, Taiwan.,Department of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan.,Division of Nephrology, Department of Internal Medicine, Taipei Medical University Hospital, Taipei Medical University, Taipei, Taiwan
| | - Jia-Fwu Shyu
- Department of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan
| | - Jia-Feng Chang
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan.,TMU Research Centre of Urology and Kidney, Taipei Medical University, Taipei, Taiwan.,Department of Nursing, Yuanpei University of Medical Technology, Hsinchu, Taiwan.,Division of Nephrology, Department of Internal Medicine, En Chu Kong Hospital, New Taipei City, Taiwan
| | - Cai-Mei Zheng
- Division of Nephrology, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan.,TMU Research Centre of Urology and Kidney, Taipei Medical University, Taipei, Taiwan.,Division of Nephrology, Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
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18
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Chen T, Gao F, Luo D, Wang S, Zhao Y, Liu S, Huang J, Lin Y, Zhang Z, Huang H, Wan L. Cistanoside A promotes osteogenesis of primary osteoblasts by alleviating apoptosis and activating autophagy through involvement of the Wnt/β-catenin signal pathway. ANNALS OF TRANSLATIONAL MEDICINE 2022; 10:64. [PMID: 35282110 PMCID: PMC8848445 DOI: 10.21037/atm-21-6742] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 01/07/2022] [Indexed: 11/22/2022]
Abstract
Background As a phenylethanoid glycoside extracted from Cistanche deserticola, cistanoside A has been shown to have antioxidative effects. In recent years, it has been found to play an important role in osteoporosis. Methods Primary osteoblasts were randomly divided into a cistanoside A (Cis A)-1 group (5 µM), a Cis A-2 group (10 µM), and a Cis A-3 group (20 µM) to screen the optimal dose. Then, cells were treated with Rapamycin (Rapa), 3-MA, Dickkopf-1 (DKK-1), 3MA + Cis A (10 µM), and DKK-1 + Cis A (10 µM). After a certain period of routine culture, Alkaline Phosphatase (ALP) and Alizarin Red S Staining were performed again and the cells were collected for subsequent experiments including immunofluorescence staining, western blotting, transmission electron microscopy, mitochondrial membrane measurement, and Annexin-V-Fluorescein isothiocyanate (Annexin-V-FITC). Results The optimal Cis A dose that preserved osteoblast viability and activated osteogenesis was 10 µM. It appeared that Cis A (10 µM) decreased apoptosis and augmented autophagy via increasing microtubule-associated protein light chain 3 (LC3)-I/II expressions as well as raising Wnt/β-catenin signal pathway activity. The addition of 3-MA further inhibited osteogenic differentiation and suppressed Wnt/β-catenin signal pathway activity to increase apoptosis while reducing autophagy levels. A combination of Cis A and DKK-1 resulted in higher levels of apoptosis but lower levels of autophagy. Conclusions Cis A appears to be a potent inducer of autophagy and inhibitor of apoptosis in primary osteoblasts by working through the Wnt/β-catenin signal pathway, thereby resulting in enhanced osteogenic differentiation.
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Affiliation(s)
- Tongying Chen
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Fenghe Gao
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Dan Luo
- Research Laboratory of Spine Degenerative Disease, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Shihao Wang
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yu Zhao
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Shuhua Liu
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jiachun Huang
- Department of Osteoporosis, The Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yanping Lin
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zhihai Zhang
- Department of Osteoporosis, The Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Hongxing Huang
- Department of Osteoporosis, The Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Lei Wan
- Department of Osteoporosis, The Third Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
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19
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Trojani MC, Santucci-Darmanin S, Breuil V, Carle GF, Pierrefite-Carle V. Autophagy and bone diseases. Joint Bone Spine 2021; 89:105301. [PMID: 34673234 DOI: 10.1016/j.jbspin.2021.105301] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/28/2021] [Indexed: 12/13/2022]
Abstract
Autophagy is a ubiquitous cellular process, allowing the removal and recycling of damaged proteins and organelles. At the basal level, this process plays a role in quality control, thus participating in cellular homeostasis. Autophagy can also be induced by various stresses, such as nutrient deprivation or hypoxia, to allow the cell to survive until conditions improve. In recent years, the role of this process has been widely studied in many pathologies such as neurodegenerative diseases or cancers. In bone tissue, various studies have shown that autophagy is involved in the survival, differentiation and activity of osteoblasts, osteocytes and osteoclasts. The evolution of this knowledge has led to the identification of new molecular pathophysiological mechanisms in bone pathologies. This review reports the current state of knowledge on the role of autophagy in 4 bone diseases: osteoporosis, which seems to be associated with a decrease in autophagy, osteopetrosis and Paget's disease where the course of the autophagic process is disturbed, and finally osteosarcoma where autophagy seems to play a protumoral role. A better understanding of the involvement of autophagy in these pathologies should eventually lead to the identification of new potential therapeutic targets.
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Affiliation(s)
- Marie-Charlotte Trojani
- UMR E-430 TIRO-MATOS CEA/DRF Institut Joliot, faculté de médecine de Nice, université Nice Côte d'Azur, 28, avenue de Valombrose, 06107 Nice cedex 2, France; Service de rhumatologie, CHU de Nice, Nice, France
| | - Sabine Santucci-Darmanin
- UMR E-430 TIRO-MATOS CEA/DRF Institut Joliot, faculté de médecine de Nice, université Nice Côte d'Azur, 28, avenue de Valombrose, 06107 Nice cedex 2, France
| | - Véronique Breuil
- UMR E-430 TIRO-MATOS CEA/DRF Institut Joliot, faculté de médecine de Nice, université Nice Côte d'Azur, 28, avenue de Valombrose, 06107 Nice cedex 2, France; Service de rhumatologie, CHU de Nice, Nice, France
| | - Georges F Carle
- UMR E-430 TIRO-MATOS CEA/DRF Institut Joliot, faculté de médecine de Nice, université Nice Côte d'Azur, 28, avenue de Valombrose, 06107 Nice cedex 2, France
| | - Valérie Pierrefite-Carle
- UMR E-430 TIRO-MATOS CEA/DRF Institut Joliot, faculté de médecine de Nice, université Nice Côte d'Azur, 28, avenue de Valombrose, 06107 Nice cedex 2, France; Inserm, Paris, France.
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20
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Klionsky DJ, Petroni G, Amaravadi RK, Baehrecke EH, Ballabio A, Boya P, Bravo‐San Pedro JM, Cadwell K, Cecconi F, Choi AMK, Choi ME, Chu CT, Codogno P, Colombo M, Cuervo AM, Deretic V, Dikic I, Elazar Z, Eskelinen E, Fimia GM, Gewirtz DA, Green DR, Hansen M, Jäättelä M, Johansen T, Juhász G, Karantza V, Kraft C, Kroemer G, Ktistakis NT, Kumar S, Lopez‐Otin C, Macleod KF, Madeo F, Martinez J, Meléndez A, Mizushima N, Münz C, Penninger JM, Perera R, Piacentini M, Reggiori F, Rubinsztein DC, Ryan K, Sadoshima J, Santambrogio L, Scorrano L, Simon H, Simon AK, Simonsen A, Stolz A, Tavernarakis N, Tooze SA, Yoshimori T, Yuan J, Yue Z, Zhong Q, Galluzzi L, Pietrocola F. Autophagy in major human diseases. EMBO J 2021; 40:e108863. [PMID: 34459017 PMCID: PMC8488577 DOI: 10.15252/embj.2021108863] [Citation(s) in RCA: 602] [Impact Index Per Article: 200.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 07/07/2021] [Accepted: 07/12/2021] [Indexed: 02/06/2023] Open
Abstract
Autophagy is a core molecular pathway for the preservation of cellular and organismal homeostasis. Pharmacological and genetic interventions impairing autophagy responses promote or aggravate disease in a plethora of experimental models. Consistently, mutations in autophagy-related processes cause severe human pathologies. Here, we review and discuss preclinical data linking autophagy dysfunction to the pathogenesis of major human disorders including cancer as well as cardiovascular, neurodegenerative, metabolic, pulmonary, renal, infectious, musculoskeletal, and ocular disorders.
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Affiliation(s)
| | - Giulia Petroni
- Department of Radiation OncologyWeill Cornell Medical CollegeNew YorkNYUSA
| | - Ravi K Amaravadi
- Department of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
- Abramson Cancer CenterUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Eric H Baehrecke
- Department of Molecular, Cell and Cancer BiologyUniversity of Massachusetts Medical SchoolWorcesterMAUSA
| | - Andrea Ballabio
- Telethon Institute of Genetics and MedicinePozzuoliItaly
- Department of Translational Medical SciencesSection of PediatricsFederico II UniversityNaplesItaly
- Department of Molecular and Human GeneticsBaylor College of Medicine, and Jan and Dan Duncan Neurological Research InstituteTexas Children HospitalHoustonTXUSA
| | - Patricia Boya
- Margarita Salas Center for Biological ResearchSpanish National Research CouncilMadridSpain
| | - José Manuel Bravo‐San Pedro
- Faculty of MedicineDepartment Section of PhysiologyComplutense University of MadridMadridSpain
- Center for Networked Biomedical Research in Neurodegenerative Diseases (CIBERNED)MadridSpain
| | - Ken Cadwell
- Kimmel Center for Biology and Medicine at the Skirball InstituteNew York University Grossman School of MedicineNew YorkNYUSA
- Department of MicrobiologyNew York University Grossman School of MedicineNew YorkNYUSA
- Division of Gastroenterology and HepatologyDepartment of MedicineNew York University Langone HealthNew YorkNYUSA
| | - Francesco Cecconi
- Cell Stress and Survival UnitCenter for Autophagy, Recycling and Disease (CARD)Danish Cancer Society Research CenterCopenhagenDenmark
- Department of Pediatric Onco‐Hematology and Cell and Gene TherapyIRCCS Bambino Gesù Children's HospitalRomeItaly
- Department of BiologyUniversity of Rome ‘Tor Vergata’RomeItaly
| | - Augustine M K Choi
- Division of Pulmonary and Critical Care MedicineJoan and Sanford I. Weill Department of MedicineWeill Cornell MedicineNew YorkNYUSA
- New York‐Presbyterian HospitalWeill Cornell MedicineNew YorkNYUSA
| | - Mary E Choi
- New York‐Presbyterian HospitalWeill Cornell MedicineNew YorkNYUSA
- Division of Nephrology and HypertensionJoan and Sanford I. Weill Department of MedicineWeill Cornell MedicineNew YorkNYUSA
| | - Charleen T Chu
- Department of PathologyUniversity of Pittsburgh School of MedicinePittsburghPAUSA
| | - Patrice Codogno
- Institut Necker‐Enfants MaladesINSERM U1151‐CNRS UMR 8253ParisFrance
- Université de ParisParisFrance
| | - Maria Isabel Colombo
- Laboratorio de Mecanismos Moleculares Implicados en el Tráfico Vesicular y la Autofagia‐Instituto de Histología y Embriología (IHEM)‐Universidad Nacional de CuyoCONICET‐ Facultad de Ciencias MédicasMendozaArgentina
| | - Ana Maria Cuervo
- Department of Developmental and Molecular BiologyAlbert Einstein College of MedicineBronxNYUSA
- Institute for Aging StudiesAlbert Einstein College of MedicineBronxNYUSA
| | - Vojo Deretic
- Autophagy Inflammation and Metabolism (AIMCenter of Biomedical Research ExcellenceUniversity of New Mexico Health Sciences CenterAlbuquerqueNMUSA
- Department of Molecular Genetics and MicrobiologyUniversity of New Mexico Health Sciences CenterAlbuquerqueNMUSA
| | - Ivan Dikic
- Institute of Biochemistry IISchool of MedicineGoethe UniversityFrankfurt, Frankfurt am MainGermany
- Buchmann Institute for Molecular Life SciencesGoethe UniversityFrankfurt, Frankfurt am MainGermany
| | - Zvulun Elazar
- Department of Biomolecular SciencesThe Weizmann Institute of ScienceRehovotIsrael
| | | | - Gian Maria Fimia
- Department of Molecular MedicineSapienza University of RomeRomeItaly
- Department of EpidemiologyPreclinical Research, and Advanced DiagnosticsNational Institute for Infectious Diseases ‘L. Spallanzani’ IRCCSRomeItaly
| | - David A Gewirtz
- Department of Pharmacology and ToxicologySchool of MedicineVirginia Commonwealth UniversityRichmondVAUSA
| | - Douglas R Green
- Department of ImmunologySt. Jude Children's Research HospitalMemphisTNUSA
| | - Malene Hansen
- Sanford Burnham Prebys Medical Discovery InstituteProgram of DevelopmentAging, and RegenerationLa JollaCAUSA
| | - Marja Jäättelä
- Cell Death and MetabolismCenter for Autophagy, Recycling & DiseaseDanish Cancer Society Research CenterCopenhagenDenmark
- Department of Cellular and Molecular MedicineFaculty of Health SciencesUniversity of CopenhagenCopenhagenDenmark
| | - Terje Johansen
- Department of Medical BiologyMolecular Cancer Research GroupUniversity of Tromsø—The Arctic University of NorwayTromsøNorway
| | - Gábor Juhász
- Institute of GeneticsBiological Research CenterSzegedHungary
- Department of Anatomy, Cell and Developmental BiologyEötvös Loránd UniversityBudapestHungary
| | | | - Claudine Kraft
- Institute of Biochemistry and Molecular BiologyZBMZFaculty of MedicineUniversity of FreiburgFreiburgGermany
- CIBSS ‐ Centre for Integrative Biological Signalling StudiesUniversity of FreiburgFreiburgGermany
| | - Guido Kroemer
- Centre de Recherche des CordeliersEquipe Labellisée par la Ligue Contre le CancerUniversité de ParisSorbonne UniversitéInserm U1138Institut Universitaire de FranceParisFrance
- Metabolomics and Cell Biology PlatformsInstitut Gustave RoussyVillejuifFrance
- Pôle de BiologieHôpital Européen Georges PompidouAP‐HPParisFrance
- Suzhou Institute for Systems MedicineChinese Academy of Medical SciencesSuzhouChina
- Karolinska InstituteDepartment of Women's and Children's HealthKarolinska University HospitalStockholmSweden
| | | | - Sharad Kumar
- Centre for Cancer BiologyUniversity of South AustraliaAdelaideSAAustralia
- Faculty of Health and Medical SciencesUniversity of AdelaideAdelaideSAAustralia
| | - Carlos Lopez‐Otin
- Departamento de Bioquímica y Biología MolecularFacultad de MedicinaInstituto Universitario de Oncología del Principado de Asturias (IUOPA)Universidad de OviedoOviedoSpain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC)MadridSpain
| | - Kay F Macleod
- The Ben May Department for Cancer ResearchThe Gordon Center for Integrative SciencesW‐338The University of ChicagoChicagoILUSA
- The University of ChicagoChicagoILUSA
| | - Frank Madeo
- Institute of Molecular BiosciencesNAWI GrazUniversity of GrazGrazAustria
- BioTechMed‐GrazGrazAustria
- Field of Excellence BioHealth – University of GrazGrazAustria
| | - Jennifer Martinez
- Immunity, Inflammation and Disease LaboratoryNational Institute of Environmental Health SciencesNIHResearch Triangle ParkNCUSA
| | - Alicia Meléndez
- Biology Department, Queens CollegeCity University of New YorkFlushingNYUSA
- The Graduate Center Biology and Biochemistry PhD Programs of the City University of New YorkNew YorkNYUSA
| | - Noboru Mizushima
- Department of Biochemistry and Molecular BiologyGraduate School of MedicineThe University of TokyoTokyoJapan
| | - Christian Münz
- Viral ImmunobiologyInstitute of Experimental ImmunologyUniversity of ZurichZurichSwitzerland
| | - Josef M Penninger
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA)Vienna BioCenter (VBC)ViennaAustria
- Department of Medical GeneticsLife Sciences InstituteUniversity of British ColumbiaVancouverBCCanada
| | - Rushika M Perera
- Department of AnatomyUniversity of California, San FranciscoSan FranciscoCAUSA
- Department of PathologyUniversity of California, San FranciscoSan FranciscoCAUSA
- Helen Diller Family Comprehensive Cancer CenterUniversity of California, San FranciscoSan FranciscoCAUSA
| | - Mauro Piacentini
- Department of BiologyUniversity of Rome “Tor Vergata”RomeItaly
- Laboratory of Molecular MedicineInstitute of Cytology Russian Academy of ScienceSaint PetersburgRussia
| | - Fulvio Reggiori
- Department of Biomedical Sciences of Cells & SystemsMolecular Cell Biology SectionUniversity of GroningenUniversity Medical Center GroningenGroningenThe Netherlands
| | - David C Rubinsztein
- Department of Medical GeneticsCambridge Institute for Medical ResearchUniversity of CambridgeCambridgeUK
- UK Dementia Research InstituteUniversity of CambridgeCambridgeUK
| | - Kevin M Ryan
- Cancer Research UK Beatson InstituteGlasgowUK
- Institute of Cancer SciencesUniversity of GlasgowGlasgowUK
| | - Junichi Sadoshima
- Department of Cell Biology and Molecular MedicineCardiovascular Research InstituteRutgers New Jersey Medical SchoolNewarkNJUSA
| | - Laura Santambrogio
- Department of Radiation OncologyWeill Cornell Medical CollegeNew YorkNYUSA
- Sandra and Edward Meyer Cancer CenterNew YorkNYUSA
- Caryl and Israel Englander Institute for Precision MedicineNew YorkNYUSA
| | - Luca Scorrano
- Istituto Veneto di Medicina MolecolarePadovaItaly
- Department of BiologyUniversity of PadovaPadovaItaly
| | - Hans‐Uwe Simon
- Institute of PharmacologyUniversity of BernBernSwitzerland
- Department of Clinical Immunology and AllergologySechenov UniversityMoscowRussia
- Laboratory of Molecular ImmunologyInstitute of Fundamental Medicine and BiologyKazan Federal UniversityKazanRussia
| | | | - Anne Simonsen
- Department of Molecular MedicineInstitute of Basic Medical SciencesUniversity of OsloOsloNorway
- Centre for Cancer Cell ReprogrammingInstitute of Clinical MedicineUniversity of OsloOsloNorway
- Department of Molecular Cell BiologyInstitute for Cancer ResearchOslo University Hospital MontebelloOsloNorway
| | - Alexandra Stolz
- Institute of Biochemistry IISchool of MedicineGoethe UniversityFrankfurt, Frankfurt am MainGermany
- Buchmann Institute for Molecular Life SciencesGoethe UniversityFrankfurt, Frankfurt am MainGermany
| | - Nektarios Tavernarakis
- Institute of Molecular Biology and BiotechnologyFoundation for Research and Technology‐HellasHeraklion, CreteGreece
- Department of Basic SciencesSchool of MedicineUniversity of CreteHeraklion, CreteGreece
| | - Sharon A Tooze
- Molecular Cell Biology of AutophagyThe Francis Crick InstituteLondonUK
| | - Tamotsu Yoshimori
- Department of GeneticsGraduate School of MedicineOsaka UniversitySuitaJapan
- Department of Intracellular Membrane DynamicsGraduate School of Frontier BiosciencesOsaka UniversitySuitaJapan
- Integrated Frontier Research for Medical Science DivisionInstitute for Open and Transdisciplinary Research Initiatives (OTRI)Osaka UniversitySuitaJapan
| | - Junying Yuan
- Interdisciplinary Research Center on Biology and ChemistryShanghai Institute of Organic ChemistryChinese Academy of SciencesShanghaiChina
- Department of Cell BiologyHarvard Medical SchoolBostonMAUSA
| | - Zhenyu Yue
- Department of NeurologyFriedman Brain InstituteIcahn School of Medicine at Mount SinaiNew YorkNYUSA
| | - Qing Zhong
- Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of EducationDepartment of PathophysiologyShanghai Jiao Tong University School of Medicine (SJTU‐SM)ShanghaiChina
| | - Lorenzo Galluzzi
- Department of Radiation OncologyWeill Cornell Medical CollegeNew YorkNYUSA
- Sandra and Edward Meyer Cancer CenterNew YorkNYUSA
- Caryl and Israel Englander Institute for Precision MedicineNew YorkNYUSA
- Department of DermatologyYale School of MedicineNew HavenCTUSA
- Université de ParisParisFrance
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21
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Abstract
Objectives
This study aims to explore the mechanism by which osteoblast autophagy participated in glucocorticoid-induced femoral head necrosis (FHN). Materials and methods
Thirty male specific-pathogen-free C57 mice (age, one month; weighing 20-25 g) were randomly divided into blank control, dexamethasone and rapamycin-dexamethasone groups (n=10). After six weeks of intervention, right femoral head was obtained to observe morphology and to calculate percentage of empty lacunae. MC3T3-E1 cells were randomly divided into normal, dexamethasone, rapamycin and dexamethasone-rapamycin groups, and cultured for 24 h. Microtubule-associated protein 1 light chain 3 (LC3)-I, LC3-II, mammalian target of rapamycin (mTOR) and Beclin-1 protein expressions were detected by Western blot. Results
In rapamycin-dexamethasone group, some bone trabeculae in medullary cavity ruptured and atrophied, and subchondral bone underwent local necrosis. The total apoptosis rates of dexamethasone and rapamycin-dexamethasone groups surpassed that of blank control group, and the former two groups had significantly different rates (p<0.001). LC3-II/LC3-I of dexamethasone group was lower than those of rapamycin and dexamethasone-rapamycin groups (p<0.001), and the ratio of rapamycin group surpassed that of dexamethasone-rapamycin group (p<0.001). Dexamethasone group had higher mTOR protein expression than those of rapamycin and dexamethasone- rapamycin groups (p<0.001), and the expression of rapamycin group was lower than that of dexamethasone-rapamycin group (p<0.001). The Beclin-1 protein expression of dexamethasone group was lower than those of rapamycin and dexamethasone- rapamycin groups (p<0.001), and the expression of rapamycin group exceeded that of dexamethasone-rapamycin group (p<0.05). Conclusion Osteoblast autophagy may play a crucial protective role in dexamethasone-induced FHN. The attenuation of autophagy may be related to the affected expressions of key autophagy regulators mTOR and Beclin-1.
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22
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Gene commander in the trash heap: Transcriptional regulation and ubiquitination modification mediated by RNF6 in carcinogenesis. Exp Cell Res 2021; 401:112396. [PMID: 33485842 DOI: 10.1016/j.yexcr.2020.112396] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/13/2020] [Accepted: 11/21/2020] [Indexed: 02/06/2023]
Abstract
RING finger protein 6 (RNF6), a RING finger protein, has been identified as a potential tumor promoter in several cancers. However, the exact mechanism of RNF6 in cancer remains elusive. As in various diseases, RNF6 may be involved in regulating cell growth, cell proliferation, invasion, cell cycle progression, apoptosis and cell adhesion through E3 ligase-mediated ubiquitination. Thus, the research on RNF6 is mainly focused on the ubiquitination of RNF6 in recent years. This article summarizes the role of RNF6 ubiquitination in various physiological and pathological mechanisms, such as Akt/mTOR signaling pathway, Wnt/β-catenin pathway, RNF6/ERα/Bcl-xL axis, and provides knowledge and understanding for the treatment of diseases.
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23
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Zhang F, Liu F, Yu S, Zhang G, Li J, Sun X. Protective Effect of Curcumin on Bone Trauma in a Rat Model via Expansion of Myeloid Derived Suppressor Cells. Med Sci Monit 2020; 26:e924724. [PMID: 33184252 PMCID: PMC7670833 DOI: 10.12659/msm.924724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Bone fracture, a common injury to bones leads to various biophysiological changes and pathological responses in the body. The current study investigated curcumin for treatment of bone fracture in a rat model of bone trauma, and evaluated the related mechanism. MATERIAL AND METHODS The rats were separated randomly into 3 groups; sham, model, and curcumin treatment groups. The fracture rat model was established by transverse osteotomy in the right femur bone at the mid-shaft. The osteoblast count was determined using hematoxylin and eosin staining. Vascular endothelial growth factor (VEGF) and proliferating cell nuclear antigen (PCNA) expression were measured by western blotting. RESULTS The rpS6-phosphorylation was suppressed and light chain 3 (LC3II) expression elevated in the curcumin treated group of the fracture rat model. In the curcumin-treated group, mineralization of fracture calluses was markedly higher on day 14 of fracture. The formation of osteoblasts was observed at a greater rate in the curcumin treated group compared to the model rat group. Treatment of rats with curcumin significantly (P<0.05) promoted expression of PCNA and VEGF. The decrease in CD11b+/Gr-1+ cell expansion in rats with bone trauma was alleviated significantly by curcumin treatment. A marked increase in arginase-1 expression in rats with bone trauma was caused by curcumin treatment. CONCLUSIONS In summary, curcumin activates autophagy and inhibits mTOR activation in bone tissues of rats with trauma. The curcumin promoted myeloid-derived suppressor cell (MDSC) proliferation and increased expansion of MDSCs in a rat model of trauma. Therefore, curcumin may have beneficial effect in patients with bone trauma and should be evaluated further for development of treatment.
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Affiliation(s)
- Futian Zhang
- Department of Orthopaedic Trauma, The 80th Group Army Hospital of The People's Liberation Army of China, Weifang, Shandong, China (mainland)
| | - Fu Liu
- Department of Orthopaedic Trauma, The 80th Group Army Hospital of The People's Liberation Army of China, Weifang, Shandong, China (mainland)
| | - Shaofen Yu
- Department of Orthopaedic Trauma, The 80th Group Army Hospital of The People's Liberation Army of China, Weifang, Shandong, China (mainland)
| | - Guihong Zhang
- Department of Orthopaedic Trauma, The 80th Group Army Hospital of The People's Liberation Army of China, Weifang, Shandong, China (mainland)
| | - Jie Li
- Department of Orthopaedic Trauma, The 80th Group Army Hospital of The People's Liberation Army of China, Weifang, Shandong, China (mainland)
| | - Xinjun Sun
- Department of Orthopaedic Trauma, The 80th Group Army Hospital of The People's Liberation Army of China, Weifang, Shandong, China (mainland)
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Moss JJ, Hammond CL, Lane JD. Zebrafish as a model to study autophagy and its role in skeletal development and disease. Histochem Cell Biol 2020; 154:549-564. [PMID: 32915267 PMCID: PMC7609422 DOI: 10.1007/s00418-020-01917-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/31/2020] [Indexed: 12/13/2022]
Abstract
In the last twenty years, research using zebrafish as a model organism has increased immensely. With the many advantages that zebrafish offer such as high fecundity, optical transparency, ex vivo development, and genetic tractability, they are well suited to studying developmental processes and the effect of genetic mutations. More recently, zebrafish models have been used to study autophagy. This important protein degradation pathway is needed for cell and tissue homeostasis in a variety of contexts. Correspondingly, its dysregulation has been implicated in multiple diseases including skeletal disorders. In this review, we explore how zebrafish are being used to study autophagy in the context of skeletal development and disease, and the ways these areas are intersecting to help identify potential therapeutic targets for skeletal disorders.
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Affiliation(s)
- Joanna J Moss
- School of Biochemistry, Biomedical Sciences Building, University of Bristol, Bristol, UK.,School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences Building, University of Bristol, Bristol, UK
| | - Chrissy L Hammond
- School of Physiology, Pharmacology and Neuroscience, Biomedical Sciences Building, University of Bristol, Bristol, UK.
| | - Jon D Lane
- School of Biochemistry, Biomedical Sciences Building, University of Bristol, Bristol, UK.
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Zhang Y, Zhang Z, Zhang Z, Zhao L, Xue Y, Wu H, Hou J. The influence of rs139416141 in neighbor of Brca1 gene (NBR1) on bone mineral density in postmenopausal Chinese women. Acta Biochim Biophys Sin (Shanghai) 2020; 52:1047-1049. [PMID: 32577726 DOI: 10.1093/abbs/gmaa070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 01/17/2020] [Accepted: 01/17/2020] [Indexed: 11/12/2022] Open
Affiliation(s)
- Yang Zhang
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou 350001, China
| | - Zhenlin Zhang
- Deptpartment of Osteoporosis and Bone Disease, Metabolic Bone Disease and Genetic Research Unit, Shanghai Jiao Tong University Affiliated Six People’s Hospital, Shanghai 200233, China
| | - Zinan Zhang
- Department of Neurological Rehabilitation, The Second Rehabilitation Hospital of Shanghai, Shanghai 200431,China
| | - Lijie Zhao
- Department of Geriatrics, General Hospital of Daqing Oil Field, Daqing 163311, China
| | - Ying Xue
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou 350001, China
| | - Haojie Wu
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou 350001, China
| | - Jianming Hou
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou 350001, China
- Endocrinology Department, Fujian Provincial Hospital, Fuzhou 350001, China
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Li X, Xu J, Dai B, Wang X, Guo Q, Qin L. Targeting autophagy in osteoporosis: From pathophysiology to potential therapy. Ageing Res Rev 2020; 62:101098. [PMID: 32535273 DOI: 10.1016/j.arr.2020.101098] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/26/2020] [Accepted: 06/03/2020] [Indexed: 12/19/2022]
Abstract
Osteoporosis is a highly prevalent disorder characterized by the loss of bone mass and microarchitecture deterioration of bone tissue, attributed to various factors, including menopause (primary), aging (primary) and adverse effects of relevant medications (secondary). In recent decades, knowledge regarding the etiological mechanisms underpinning osteoporosis emphasizes that bone cellular homeostasis, including the maintenance of cell functions, differentiation, and the response to stress, is tightly regulated by autophagy, which is a cell survival mechanism for eliminating and recycling damaged proteins and organelles. With the important roles in the maintenance of cellular homeostasis and organ function, autophagy has emerged as a potential target for the prevention and treatment of osteoporosis. In this review, we update and discuss the pathophysiology of autophagy in normal bone cell life cycle and metabolism. Then, the alternations of autophagy in primary and secondary osteoporosis, and the accompanied pathological process are discussed. Finally, we discuss current strategies, limitations, and challenges involved in targeting relevant pathways and propose strategies by which such hurdles may be circumvented in the future for their translation into clinical validations and applications for the prevention and treatment of osteoporosis.
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Chen XD, Tan JL, Feng Y, Huang LJ, Zhang M, Cheng B. Autophagy in fate determination of mesenchymal stem cells and bone remodeling. World J Stem Cells 2020; 12:776-786. [PMID: 32952858 PMCID: PMC7477662 DOI: 10.4252/wjsc.v12.i8.776] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/17/2020] [Accepted: 06/20/2020] [Indexed: 02/06/2023] Open
Abstract
Mesenchymal stem cells (MSCs) have been widely exploited as promising candidates in clinical settings for bone repair and regeneration in view of their self-renewal capacity and multipotentiality. However, little is known about the mechanisms underlying their fate determination, which would illustrate their effectiveness in regenerative medicine. Recent evidence has shed light on a fundamental biological role of autophagy in the maintenance of the regenerative capability of MSCs and bone homeostasis. Autophagy has been implicated in provoking an immediately available cytoprotective mechanism in MSCs against stress, while dysfunction of autophagy impairs the function of MSCs, leading to imbalances of bone remodeling and a wide range of aging and degenerative bone diseases. This review aims to summarize the up-to-date knowledge about the effects of autophagy on MSC fate determination and its role as a stress adaptation response. Meanwhile, we highlight autophagy as a dynamic process and a double-edged sword to account for some discrepancies in the current research. We also discuss the contribution of autophagy to the regulation of bone cells and bone remodeling and emphasize its potential involvement in bone disease.
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Affiliation(s)
- Xiao-Dan Chen
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Jia-Li Tan
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Yi Feng
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Li-Jia Huang
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Mei Zhang
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
| | - Bin Cheng
- Hospital of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology; Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, Guangdong Province, China
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Ran D, Ma Y, Liu W, Luo T, Zheng J, Wang D, Song R, Zhao H, Zou H, Gu J, Yuan Y, Bian J, Liu Z. TGF-β-activated kinase 1 (TAK1) mediates cadmium-induced autophagy in osteoblasts via the AMPK / mTORC1 / ULK1 pathway. Toxicology 2020; 442:152538. [PMID: 32693121 DOI: 10.1016/j.tox.2020.152538] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 06/23/2020] [Accepted: 07/13/2020] [Indexed: 01/28/2023]
Abstract
Cadmium (Cd) is one of worldwide environmental pollutants that causes bone homeostasis, which depends on the resorption of bones by osteoclasts and formation of bones by the osteoblasts (OB). However, the Cd toxicity on OB and its mechanism are unclear. Autophagy is an evolutionarily conserved degradation process in which domestic intracellular components are selectively digested for the recycling of nutrients and energy. This process is indispensable for cell homeostasis maintenance and stress responses. Dysregulation at the level of autophagic activity consequently disturbs the balance between bone formation and bone resorption and mediates the onset and progression of multiple bone diseases, including osteoporosis. TAK1 has been recently emerged as an activator of AMPK and hence an autophagy inducer. AMPK is a key molecule that induces autophagy and regulates cellular metabolism to maintain energy homeostasis. Conversely, autophagy is inhibited by mTORC1. In this study, we found that Cd treatment caused the formation of autophagosomes, LC3-II lipidation and p62 downregulation, and the increased autophagic flux, indicating that Cd treatment induced autophagy in OBs. Cd treatment induced TAK1 activation mediated AMPK phosphorylation, which promoted autophagy via phosphorylation of ULK1 at S317. Meanwhile, Cd treatment dramatically decreased mTORC1, S6K1, 4E-BP1, S6, ULK1S555 and ULK1S757 phosphorylation, suggesting that mTORC1 activity was inhibited and inactive mTORC1 prevents ULK1 activation by phosphorylating ULK1 at SerS555 and Ser757. Our data strongly suggest that TAK1 mediates AMPK activation, which activates ULK1 by phosphorylating ULK1S317 and suppressing mTORC1-mediated ULK1S555 and ULK1S757 phosphorylation. Our study has revealed a signaling mechanism for TAK1 in Cd-induced autophagy in OBs.
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Affiliation(s)
- Di Ran
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Yonggang Ma
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Wei Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Tongwang Luo
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Jiaming Zheng
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Dedong Wang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Ruilong Song
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Hongyan Zhao
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Hui Zou
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Jianhong Gu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Yan Yuan
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Jianchun Bian
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China
| | - Zongping Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, 225009, PR China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, 225009, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education of China, Yangzhou University, PR China.
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Li G, Qian L, Tang X, Chen Y, Zhao Z, Zhang C. Long non‑coding RNA growth arrest‑specific 5 (GAS5) acts as a tumor suppressor by promoting autophagy in breast cancer. Mol Med Rep 2020; 22:2460-2468. [PMID: 32705220 PMCID: PMC7411390 DOI: 10.3892/mmr.2020.11334] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 06/04/2020] [Indexed: 01/27/2023] Open
Abstract
Growth arrest-specific 5 (GAS5) is a known tumor suppressor which negatively regulates cell survival and malignancy in several cancer cell types. The present study aimed to establish the correlation between GAS5 and unc-51 like autophagy activating kinase (ULK)1/2, two key regulators of autophagy initiation in breast cancer (BC). To address this, expression levels of these genes were quantitively analyzed in BC clinical samples by performing reverse transcription-quantitative PCR. GAS5 was downregulated in BC clinical samples compared with adjacent samples and was positively correlated with ULK1/2. Detection methods including cell cycle analysis, annexin V-FITC/PI double staining and flow cytometry analysis, Transwell cell invasion assay, transfection and western blotting were used for BC cells. In MCF-7 cells, it was also observed that overexpression of GAS5 upregulated ULK1/2 protein levels without disturbing other autophagy initiation-associated proteins and inhibited cell proliferation, invasion and tumor formation. These effects were reversed by blocking autophagy with 3-methyladenine (3-MA). These results demonstrated that the suppressive effects of overexpressed GAS5 were mediated via autophagy induction, at least in part. Overexpression of GAS5 induced chemoresistance to cisplatin, which was not reversed by 3-MA-mediated inhibition of autophagy, indicating that GAS5 promotes chemosensitivity in an autophagy-independent manner. Collectively, these results indicated that GAS5 contributes to the pathogenesis of BC potentially by promoting autophagy. However, the mechanism by which GAS5 functions as a tumor suppressor in an autophagy-independent manner remains unknown.
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Affiliation(s)
- Guangping Li
- Integration of Traditional and Western Medicine and Oncology, Chengdu, Sichuan 610072, P.R. China
| | - Lin Qian
- The Teaching Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan 610072, P.R. China
| | - Xiaoqin Tang
- Department of Pathology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
| | - Yuan Chen
- Department of Pathology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
| | - Ziyi Zhao
- The Teaching Hospital of Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan 610072, P.R. China
| | - Cuiwei Zhang
- Department of Pathology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
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Fu L, Wu W, Sun X, Zhang P. Glucocorticoids Enhanced Osteoclast Autophagy Through the PI3K/Akt/mTOR Signaling Pathway. Calcif Tissue Int 2020; 107:60-71. [PMID: 32274533 DOI: 10.1007/s00223-020-00687-2] [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: 12/18/2019] [Accepted: 03/26/2020] [Indexed: 12/23/2022]
Abstract
Autophagy is an evolutionarily conserved dynamic process and present in variety of cells at basal levels to maintain homeostasis and to promote cell survival in response to stresses. The early bone loss with excessive glucocorticoids (GCs) was reported to be related with the extension of the life span of osteoclasts. However, the connection between GCs induced bone loss and osteoclast autophagy remains to be elucidated. Autophagy was detected in a Dexamethasone (Dex) induced osteoporotic mice model and primary osteoclast cultures by autophagosome detection kit, and autophagy-related proteins were assayed by Western blotting and Immunostaining. The bone morphology was examined by micro-CT and TRAP staining. The trabecular bone micro-architecture was deteriorated, and the osteoclast number and spread area were increased in the Dex-treated mice compared with the control group (P < 0.01). Meanwhile, autophagy in pre-osteoclasts was increased in mice under Dex administration evidenced by the increased number of autophagosome and up-regulation of autophagy-related protein levels. Further, the enhanced autophagy under Dex treatment was verified in primary cultured osteoclasts, as shown by the increased levels of Beclin 1 and LC3-II/LC3-I and the autophagy complex formation members including Atg1, Atg13, and Atg7. However, the expressions of PI3K, p-Akt and p-mTOR in primary cultured osteoclasts were inhibited under Dex induced autophagy. Using the selective PTEN inhibitor SF1670 to activate the PI3K/Akt/mTOR pathway reversed this osteoclast autophagy under Dex treatment. Our study suggests that osteoclast autophagy was enhanced in glucocorticoids induced bone loss, and the PI3K/Akt/mTOR signaling pathway mediated the increased autophagy in primary cultured osteoclasts under glucocorticoids treatment.
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Affiliation(s)
- Lingjie Fu
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, People's Republic of China
| | - Wen Wu
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, People's Republic of China
| | - Xiaojiang Sun
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, People's Republic of China
| | - Pu Zhang
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, People's Republic of China.
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Liu X, Zhang Y, Tian J, Gao F. Analyzing Genome-Wide Association Study Dataset Highlights Immune Pathways in Lip Bone Mineral Density. Front Genet 2020; 11:4. [PMID: 32211016 PMCID: PMC7077504 DOI: 10.3389/fgene.2020.00004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 01/06/2020] [Indexed: 12/27/2022] Open
Abstract
Osteoporosis is a common complex human disease. Until now, large-scale genome-wide association studies (GWAS) using single genetic variant have reported some novel osteoporosis susceptibility variants. However, these risk variants only explain a small proportion of osteoporosis genetic risk, and most genetic risk is largely unknown. Interestingly, the pathway analysis method has been used in investigation of osteoporosis mechanisms and reported some novel pathways. Until now, it remains unclear whether there are other risk pathways involved in BMD. Here, we selected a lip BMD GWAS with 301,019 SNPs in 5,858 Europeans, and conducted a gene-based analysis (SET SCREEN TEST) and a pathway-based analysis (WebGestalt). On the gene level, BMD susceptibility genes reported by previous GWAS were identified to be the top 10 significant signals. On the pathway level, we identified 27 significant KEGG pathways. Three immune pathways including T cell receptor signaling pathway (hsa04660), complement and coagulation cascades (hsa04610), and intestinal immune network for IgA production (hsa04672) are ranked the top three significant signals. Evidence from the PubMed and Google Scholar databases further supports our findings. In summary, our findings provide complementary information to these nine risk pathways.
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Affiliation(s)
- Xiaodong Liu
- Department of Trauma and Emergency Surgeon, The Second Affiliated Hospital, Harbin Medical University, Harbin, China
| | - Yiwei Zhang
- Department of Trauma and Emergency Surgeon, The Second Affiliated Hospital, Harbin Medical University, Harbin, China
| | - Jun Tian
- Department of Trauma and Emergency Surgeon, The Second Affiliated Hospital, Harbin Medical University, Harbin, China
| | - Feng Gao
- Department of Trauma and Emergency Surgeon, The Second Affiliated Hospital, Harbin Medical University, Harbin, China
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Yang TL, Shen H, Liu A, Dong SS, Zhang L, Deng FY, Zhao Q, Deng HW. A road map for understanding molecular and genetic determinants of osteoporosis. Nat Rev Endocrinol 2020; 16:91-103. [PMID: 31792439 PMCID: PMC6980376 DOI: 10.1038/s41574-019-0282-7] [Citation(s) in RCA: 184] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/18/2019] [Indexed: 12/16/2022]
Abstract
Osteoporosis is a highly prevalent disorder characterized by low bone mineral density and an increased risk of fracture, termed osteoporotic fracture. Notably, bone mineral density, osteoporosis and osteoporotic fracture are highly heritable; however, determining the genetic architecture, and especially the underlying genomic and molecular mechanisms, of osteoporosis in vivo in humans is still challenging. In addition to susceptibility loci identified in genome-wide association studies, advances in various omics technologies, including genomics, transcriptomics, epigenomics, proteomics and metabolomics, have all been applied to dissect the pathogenesis of osteoporosis. However, each technology individually cannot capture the entire view of the disease pathology and thus fails to comprehensively identify the underlying pathological molecular mechanisms, especially the regulatory and signalling mechanisms. A change to the status quo calls for integrative multi-omics and inter-omics analyses with approaches in 'systems genetics and genomics'. In this Review, we highlight findings from genome-wide association studies and studies using various omics technologies individually to identify mechanisms of osteoporosis. Furthermore, we summarize current studies of data integration to understand, diagnose and inform the treatment of osteoporosis. The integration of multiple technologies will provide a road map to illuminate the complex pathogenesis of osteoporosis, especially from molecular functional aspects, in vivo in humans.
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Affiliation(s)
- Tie-Lin Yang
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - Hui Shen
- Center of Bioinformatics and Genomics, Department of Global Biostatistics and Data Science, Tulane University, New Orleans, LA, USA
| | - Anqi Liu
- Center of Bioinformatics and Genomics, Department of Global Biostatistics and Data Science, Tulane University, New Orleans, LA, USA
| | - Shan-Shan Dong
- Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - Lei Zhang
- Center for Genetic Epidemiology and Genomics, School of Public Health, Medical College of Soochow University, Jiangsu, China
| | - Fei-Yan Deng
- Center for Genetic Epidemiology and Genomics, School of Public Health, Medical College of Soochow University, Jiangsu, China
| | - Qi Zhao
- Department of Preventive Medicine, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Hong-Wen Deng
- Center of Bioinformatics and Genomics, Department of Global Biostatistics and Data Science, Tulane University, New Orleans, LA, USA.
- School of Basic Medical Science, Central South University, Changsha, China.
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He S, Zhou Q, Luo B, Chen B, Li L, Yan F. Chloroquine and 3-Methyladenine Attenuates Periodontal Inflammation and Bone Loss in Experimental Periodontitis. Inflammation 2019; 43:220-230. [DOI: 10.1007/s10753-019-01111-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Thomas N, Choi HK, Wei X, Wang L, Mishina Y, Guan JL, Liu F. Autophagy Regulates Craniofacial Bone Acquisition. Calcif Tissue Int 2019; 105:518-530. [PMID: 31372669 PMCID: PMC6801085 DOI: 10.1007/s00223-019-00593-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 07/26/2019] [Indexed: 10/26/2022]
Abstract
Increasing evidence has demonstrated the important role of autophagy in skeletal homeostasis; however, the role of autophagy in craniofacial bone development and acquisition is largely unknown. In this study, we investigated the effect of autophagy suppression on craniofacial bone acquisition by deleting Fip200 or Atg5, two essential autophagy genes, using Osterix-Cre (Osx-Cre). We found that the Osx-Cre transgene mildly decreased the bone mass of parietal bone but not frontal bone, and did not affect cranial base bone mass in adult mice. In the cranial vault, Fip200 or Atg5 deletion similarly decreased 50% bone mass of neural crest-derived frontal bone; Atg5 deletion decreased 50% and Fip200 deletion decreased 30% bone mass of mesoderm-derived parietal bone. In the cranial base, Fip200 or Atg5 deletion similarly decreased 30% bone mass of neural crest-derived presphenoid bone; Atg5 deletion decreased 30% and Fip200 deletion decreased 16% bone mass of mesoderm-derive basioccipital bone. Lastly, we used doxycycline treatment to inhibit the Osx-Cre expression until 2 months of age and showed that postnatal Fip200 deletion led to cranial vault bone mass decrease in association with a small increase in both bone volume/tissue volume and tissue mineral density. Altogether, this study demonstrated the important role of autophagy in craniofacial bone acquisition during development and postnatal growth.
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Affiliation(s)
- Neil Thomas
- Department of Biologic and Materials Sciences & Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Han Kyoung Choi
- Department of Biologic and Materials Sciences & Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Xiaoxi Wei
- Department of Biologic and Materials Sciences & Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
- Department of Orthodontics, Jilin University School and Hospital of Stomatology, Changchun, 130021, Jilin, China
| | - Li Wang
- Department of Biologic and Materials Sciences & Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Yuji Mishina
- Department of Biologic and Materials Sciences & Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
| | - Jun-Lin Guan
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Fei Liu
- Department of Biologic and Materials Sciences & Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA.
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Autophagy in bone homeostasis and the onset of osteoporosis. Bone Res 2019; 7:28. [PMID: 31666998 PMCID: PMC6804951 DOI: 10.1038/s41413-019-0058-7] [Citation(s) in RCA: 113] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 05/28/2019] [Accepted: 06/02/2019] [Indexed: 02/06/2023] Open
Abstract
Autophagy is an evolutionarily conserved intracellular process, in which domestic cellular components are selectively digested for the recycling of nutrients and energy. This process is indispensable for cell homeostasis maintenance and stress responses. Both genetic and functional studies have demonstrated that multiple proteins involved in autophagic activities are critical to the survival, differentiation, and functioning of bone cells, including osteoblasts, osteocytes, and osteoclasts. Dysregulation at the level of autophagic activity consequently disturbs the balance between bone formation and bone resorption and mediates the onset and progression of multiple bone diseases, including osteoporosis. This review aims to introduce the topic of autophagy, summarize the understanding of its relevance in bone physiology, and discuss its role in the onset of osteoporosis and therapeutic potential.
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Chen L, Mo S, Hua Y. Compressive force-induced autophagy in periodontal ligament cells downregulates osteoclastogenesis during tooth movement. J Periodontol 2019; 90:1170-1181. [PMID: 31077358 DOI: 10.1002/jper.19-0049] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 03/19/2019] [Accepted: 04/28/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND Autophagy has recently emerged as a protective mechanism in response to compressive force and an important process in maintenance of bone homeostasis. It appears to be involved in the degradation of osteoclasts, osteoblasts, and osteocytes. The aim of this study was to investigate the role of compressive force-induced autophagy in periodontal ligament (PDL) cells in regulating osteoclastogenesis of orthodontic tooth movement (OTM). METHODS An OTM model and compressive force on PDL cells were employed to investigate the expression of autophagy markers in vivo and in vitro, respectively. Autophagosomes and autolysosomes were observed in PDL cells by transmission electron microscope (TEM) and autophagy LC3 double labelling. 3-Methyladenine (3-MA) and rapamycin were respectively used to inhibit and promote autophagy, and the effect of autophagy on osteoclastogenesis was explored via microcomputed tomography, hematoxylin and eosin (H&E) staining, histochemistry of titrate-resistant acid phosphatase, and real-time polymerase chain reaction (RT-PCR) in vivo. Receptor activator of nuclear factor-kappa B ligand/osteoprotegerin (RANKL/OPG) was investigated by RT-PCR and ELISA in vitro. RESULTS Orthodontic force-induced autophagy was prominent on the pressured side of PDL tissues. Administration of 3-MA downregulated bone density and upregulated osteoclasts, while rapamycin had reverse results in OTM. The autophagy activity increased initially then decreased in PDL cells during compressive force application and responded to light force. In PDL cells, administration of 3-MA upregulated while rapamycin downregulated the RANKL/OPG ratio. CONCLUSION Autophagy is activated by compressive force in PDL cells. Besides, it could modulate OTM by negatively regulating osteoclastogenesis and keep bone homeostasis via RANKL/OPG signaling.
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Affiliation(s)
- Liyuan Chen
- Department of Orthodontics, School of Stomatology, Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Shenzheng Mo
- Department of Orthodontics, School of Stomatology, Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
| | - Yongmei Hua
- Department of Orthodontics, School of Stomatology, Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration, Shanghai, China
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Sul OJ, Sung YB, Rajasekaran M, Ke K, Yu R, Back SH, Choi HS. MicroRNA-155 induces autophagy in osteoclasts by targeting transforming growth factor β-activated kinase 1-binding protein 2 upon lipopolysaccharide stimulation. Bone 2018; 116:279-289. [PMID: 30144578 DOI: 10.1016/j.bone.2018.08.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Revised: 08/20/2018] [Accepted: 08/21/2018] [Indexed: 12/30/2022]
Abstract
The autophagy pathway has been suggested to influence skeletal structure by modulating bone metabolism. Recent findings suggest that microRNAs (miR) play a critical role in autophagy. We hypothesized that inflammation induces miR-155, which enhances autophagy in osteoclasts (OC), leading to inflammatory bone loss. The expression of miR-155 was elevated in tibiae from LPS-injected mice and in OC stimulated by lipopolysaccharide (LPS) compared with vehicle treatment. Overexpression of miR-155 enhanced autophagy as well as differentiation in OC, whereas inhibition of endogenous miR-155 decreased both. Transforming growth factor β-activated kinase 1-binding protein 2 (TAB2) was identified as a target gene of miR-155 via binding to the 3'-UTR of TAB2, which directly interacts with BECLIN1. BECLIN1 was dissociated from TAB2, which started to associate with TAK1 when autophagy was induced. Our data demonstrate that LPS-induced miR-155 promoted autophagy to increase OC formation via decreased TAB2.
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Affiliation(s)
- Ok-Joo Sul
- Department of Biological Sciences, University of Ulsan, Ulsan 680-749, Republic of Korea
| | - You-Bin Sung
- Department of Food Science and Nutrition, University of Ulsan, Ulsan 680-749, Republic of Korea
| | - Monisha Rajasekaran
- Department of Biological Sciences, University of Ulsan, Ulsan 680-749, Republic of Korea
| | - Ke Ke
- Department of Biological Sciences, University of Ulsan, Ulsan 680-749, Republic of Korea
| | - Rina Yu
- Department of Food Science and Nutrition, University of Ulsan, Ulsan 680-749, Republic of Korea
| | - Sung-Hoon Back
- Department of Biological Sciences, University of Ulsan, Ulsan 680-749, Republic of Korea
| | - Hye-Seon Choi
- Department of Biological Sciences, University of Ulsan, Ulsan 680-749, Republic of Korea.
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38
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Shen G, Ren H, Shang Q, Qiu T, Yu X, Zhang Z, Huang J, Zhao W, Zhang Y, Liang D, Jiang X. Autophagy as a target for glucocorticoid-induced osteoporosis therapy. Cell Mol Life Sci 2018; 75:2683-2693. [PMID: 29427075 PMCID: PMC11105583 DOI: 10.1007/s00018-018-2776-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 01/25/2018] [Accepted: 02/06/2018] [Indexed: 02/07/2023]
Abstract
Autophagy takes part in regulating the eukaryotic cells function and the progression of numerous diseases, but its clinical utility has not been fully developed yet. Recently, mounting evidences highlight an important correlation between autophagy and bone homeostasis, mediated by osteoclasts, osteocytes, bone marrow mesenchymal stem cells, and osteoblasts, and autophagy plays a vital role in the pathogenesis of glucocorticoid-induced osteoporosis (GIOP). The combinations of autophagy activators/inhibitors with anti-GIOP first-line drugs or some new autophagy-based manipulators, such as regulation of B cell lymphoma 2 family proteins and caspase-dependent clearance of autophagy-related gene proteins, are likely to be the promising approaches for GIOP clinical treatments. In view of the important role of autophagy in the pathogenesis of GIOP, here we review the potential mechanisms about the impacts of autophagy in GIOP and its association with GIOP therapy.
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Affiliation(s)
- Gengyang Shen
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Hui Ren
- Department of Spinal Surgery, The First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Qi Shang
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Ting Qiu
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Xiang Yu
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Zhida Zhang
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Jinjing Huang
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Wenhua Zhao
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Yuzhuo Zhang
- Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - De Liang
- Department of Spinal Surgery, The First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China
| | - Xiaobing Jiang
- Department of Spinal Surgery, The First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China.
- Laboratory Affiliated to National Key Discipline of Orthopaedic and Traumatology of Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, 510405, China.
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39
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Li H, Li D, Ma Z, Qian Z, Kang X, Jin X, Li F, Wang X, Chen Q, Sun H, Wu S. Defective autophagy in osteoblasts induces endoplasmic reticulum stress and causes remarkable bone loss. Autophagy 2018; 14:1726-1741. [PMID: 29962255 PMCID: PMC6135623 DOI: 10.1080/15548627.2018.1483807] [Citation(s) in RCA: 126] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 05/15/2018] [Accepted: 05/24/2018] [Indexed: 12/13/2022] Open
Abstract
Macroautophagy/autophagy is a highly regulated process involved in the turnover of cytosolic components, however its pivotal role in maintenance of bone homeostasis remains elusive. In the present study, we investigated the direct role of ATG7 (autophagy related 7) during developmental and remodeling stages in vivo using osteoblast-specific Atg7 conditional knockout (cKO) mice. Atg7 cKO mice exhibited a reduced bone mass at both developmental and adult age. The trabecular bone volume of Atg7 cKO mice was significantly lower than that of controls at 5 months of age. This phenotype was attributed to decreased osteoblast formation and matrix mineralization, accompanied with an increased osteoclast number and the extent of the bone surface covered by osteoclasts as well as an elevated secretion of TNFSF11/RANKL (tumor necrosis factor [ligand] superfamily, member 11), and a decrease in TNFRSF11B/OPG (tumor necrosis factor receptor superfamily, member 11b [osteoprotegerin]). Remarkably, Atg7 deficiency in osteoblasts triggered endoplasmic reticulum (ER) stress, whereas attenuation of ER stress by administration of phenylbutyric acid in vivo abrogated Atg7 ablation-mediated effects on osteoblast differentiation, mineralization capacity and bone formation. Consistently, Atg7 deficiency impeded osteoblast mineralization and promoted apoptosis partially in DDIT3/CHOP (DNA-damage-inducible transcript 3)- and MAPK8/JNK1 (mitogen-activated protein kinase 8)-SMAD1/5/8-dependent manner in vitro, while reconstitution of Atg7 could improve ER stress and restore skeletal balance. In conclusion, our findings provide direct evidences that autophagy plays crucial roles in regulation of bone homeostasis and suggest an innovative therapeutic strategy against skeletal diseases.
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Affiliation(s)
- Huixia Li
- The First Affiliated Hospital of Xi’an Jiaotong University; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University Health Science Center, Xi’an, Shaanxi, China
| | - Danhui Li
- The First Affiliated Hospital of Xi’an Jiaotong University; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University Health Science Center, Xi’an, Shaanxi, China
| | - Zhengmin Ma
- The First Affiliated Hospital of Xi’an Jiaotong University; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University Health Science Center, Xi’an, Shaanxi, China
| | - Zhuang Qian
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Xiaomin Kang
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Xinxin Jin
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Fang Li
- The First Affiliated Hospital of Xi’an Jiaotong University; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University Health Science Center, Xi’an, Shaanxi, China
| | - Xinluan Wang
- Translational Medicine R&D Center, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Qian Chen
- Department of Orthopaedics, Alpert Medical School of Brown University, Rhode Island Hospital, Providence, RI, USA
- Bone and Joint Research Center, the First Affiliated Hospital of Medical School, Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Hongzhi Sun
- The First Affiliated Hospital of Xi’an Jiaotong University; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University Health Science Center, Xi’an, Shaanxi, China
| | - Shufang Wu
- The First Affiliated Hospital of Xi’an Jiaotong University; Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi’an Jiaotong University Health Science Center, Xi’an, Shaanxi, China
- Center for Translational Medicine, the First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
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40
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4-Phenylbutyric acid protects against lipopolysaccharide-induced bone loss by modulating autophagy in osteoclasts. Biochem Pharmacol 2018; 151:9-17. [DOI: 10.1016/j.bcp.2018.02.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 02/14/2018] [Indexed: 11/20/2022]
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41
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Sylvester FA. Inflammatory Bowel Disease: Effects on Bone and Mechanisms. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1033:133-150. [PMID: 29101654 DOI: 10.1007/978-3-319-66653-2_7] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Inflammatory bowel disease (IBD) is associated with decreased bone mass and alterations in bone geometry from the time of diagnosis, before anti-inflammatory therapy is instituted. Deficits in bone mass can persist despite absence of symptoms of active IBD. The effects of IBD on the skeleton are complex. Protein-calorie malnutrition, inactivity, hypogonadism, deficits in calcium intake and vitamin D consumption and synthesis, stunted growth in children, decreased skeletal muscle mass, and inflammation all likely play a role. Preliminary studies suggest that the dysbiotic intestinal microbial flora present in IBD may also affect bone at a distance. Several mechanisms are possible. T cells activated by the gut microbiota may serve as "inflammatory shuttles" between the intestine and bone. Microbe-associated molecular patterns leaked into the circulation in IBD may activate immune responses in the bone marrow by immune cells and by osteocytes, osteoblasts, and osteoclasts that lead to decreased bone formation and increased resorption. Finally, intestinal microbial metabolites such as H2S may also affect bone cell function. Uncovering these mechanisms will enable the design of microbial cocktails to help restore bone mass in patients with IBD.
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Affiliation(s)
- Francisco A Sylvester
- Division Chief of Pediatric Gastroenterology, The University of North Carolina at Chapel Hil, 333 South Columbia Street, MacNider Hall 247, Chapel Hill, NC, 27599-7229, USA.
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42
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Camuzard O, Santucci-Darmanin S, Breuil V, Cros C, Gritsaenko T, Pagnotta S, Cailleteau L, Battaglia S, Panaïa-Ferrari P, Heymann D, Carle GF, Pierrefite-Carle V. Sex-specific autophagy modulation in osteoblastic lineage: a critical function to counteract bone loss in female. Oncotarget 2018; 7:66416-66428. [PMID: 27634908 PMCID: PMC5341810 DOI: 10.18632/oncotarget.12013] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 09/09/2016] [Indexed: 01/06/2023] Open
Abstract
Age-related bone loss is associated with an increased oxidative stress which is worsened by estrogen fall during menauposis. This observation has drawn attention to autophagy, a major cellular catabolic process, able to alleviate oxidative stress in osteoblasts (OB) and osteocytes (OST), two key bone cell types. Moreover, an autophagy decline can be associated with aging, suggesting that an age-related autophagy deficiency in OB and/or OST could contribute to skeletal aging and osteoporosis onset. In the present work, autophagy activity was analyzed in OST and OB in male and female mice according to their age and hormonal status. In OST, autophagy decreases with aging in both sexes. In OB, although a 95% decrease in autophagy is observed in OB derived from old females, this activity remains unchanged in males. In addition, while ovariectomy has no effect on OB autophagy levels, orchidectomy appears to stimulate this process. An inverse correlation between autophagy and the oxidative stress level was observed in OB derived from males or females. Finally, using OB-specific autophagy-deficient mice, we showed that autophagy deficiency aggravates the bone loss associated with aging and estrogen deprivation. Taken together, our data indicate that autophagic modulation in bone cells differs according to sex and cell type. The lowering of autophagy in female OB, which is associated with an increased oxidative stress, could play a role in osteoporosis pathophysiology and suggests that autophagy could be a new therapeutic target for osteoporosis in women.
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Affiliation(s)
- Olivier Camuzard
- UMR E-4320 TIRO-MATOs CEA/DRF/BIAM, Université Nice Sophia Antipolis, Faculté de Médecine Nice, Nice, France.,Service de Chirurgie Réparatrice et de la Main, CHU de Nice, Nice, France
| | - Sabine Santucci-Darmanin
- UMR E-4320 TIRO-MATOs CEA/DRF/BIAM, Université Nice Sophia Antipolis, Faculté de Médecine Nice, Nice, France
| | - Véronique Breuil
- UMR E-4320 TIRO-MATOs CEA/DRF/BIAM, Université Nice Sophia Antipolis, Faculté de Médecine Nice, Nice, France.,Service de Rhumatologie, CHU de Nice, Nice, France
| | - Chantal Cros
- UMR E-4320 TIRO-MATOs CEA/DRF/BIAM, Université Nice Sophia Antipolis, Faculté de Médecine Nice, Nice, France
| | - Tatiana Gritsaenko
- UMR E-4320 TIRO-MATOs CEA/DRF/BIAM, Université Nice Sophia Antipolis, Faculté de Médecine Nice, Nice, France
| | - Sophie Pagnotta
- Centre Commun de Microscopie Appliquee, Université Nice Sophia Antipolis, Nice, France
| | - Laurence Cailleteau
- Plateforme Imagerie IRCAN, Faculté de Médecine, Université Nice Sophia Antipolis, Nice, France
| | - Séverine Battaglia
- INSERM UMR 957 Université de Nantes, Equipe labellisée Ligue Nationale Contre le Cancer, Nantes, France
| | | | - Dominique Heymann
- INSERM UMR 957 Université de Nantes, Equipe labellisée Ligue Nationale Contre le Cancer, Nantes, France.,Department of Oncology and Metabolism, The Medical School, University of Sheffield, Sheffield, UK
| | - Georges F Carle
- UMR E-4320 TIRO-MATOs CEA/DRF/BIAM, Université Nice Sophia Antipolis, Faculté de Médecine Nice, Nice, France
| | - Valérie Pierrefite-Carle
- UMR E-4320 TIRO-MATOs CEA/DRF/BIAM, Université Nice Sophia Antipolis, Faculté de Médecine Nice, Nice, France
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43
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Integrating genome-wide association study and expression quantitative trait locus study identifies multiple genes and gene sets associated with schizophrenia. Prog Neuropsychopharmacol Biol Psychiatry 2018; 81:50-54. [PMID: 29024729 DOI: 10.1016/j.pnpbp.2017.10.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/25/2017] [Accepted: 10/04/2017] [Indexed: 02/02/2023]
Abstract
Schizophrenia is a serious mental disease with high heritability. To better understand the genetic basis of schizophrenia, we conducted a large scale integrative analysis of genome-wide association study (GWAS) and expression quantitative trait loci (eQTLs) data. GWAS summary data was derived from a published GWAS of schizophrenia, containing 9394 schizophrenia patients and 12,462 healthy controls. The eQTLs dataset was obtained from an eQTLs meta-analysis of 5311 subjects, containing 923,021 cis-eQTLs for 14,329 genes and 4732 trans-eQTLs for 2612 genes. Genome-wide single gene expression association analysis was conducted by SMR software. The SMR analysis results were further subjected to gene set enrichment analysis (GSEA) to identify schizophrenia associated gene sets. SMR detected 49 genes significantly associated with schizophrenia. The top five significant genes were CRELD2 (p value=1.65×10-11), DIP2B (p value=3.94×10-11), ZDHHC18 (p value=1.52×10-10) and ZDHHC5 (p value=7.45×10-10), C11ORF75 (p value=3.70×10-9). GSEA identified 80 gene sets with p values <0.01. The top five significant gene sets were COWLING_MYCN_TARGETS (p value <0.001) and CHR16P11 (p value <0.001), ACTACCT_MIR196A_MIR196B (p value=0.002), CELLULAR_COMPONENT_DISASSEMBLY (p value=0.002) and GRAESSMANN_RESPONSE_TO_MC_AND_DOXORUBICIN_DN (p value=0.002). Our results provide useful information for revealing the genetic basis of schizophrenia.
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44
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Florencio-Silva R, Sasso GRS, Sasso-Cerri E, Simões MJ, Cerri PS. Effects of estrogen status in osteocyte autophagy and its relation to osteocyte viability in alveolar process of ovariectomized rats. Biomed Pharmacother 2017; 98:406-415. [PMID: 29276969 DOI: 10.1016/j.biopha.2017.12.089] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 12/05/2017] [Accepted: 12/18/2017] [Indexed: 12/13/2022] Open
Abstract
Estrogen maintains osteocyte viability, whereas its deficiency induces osteocyte apoptosis. As autophagy is important for osteocyte viability, we hypothesized whether the anti-apoptotic effect of estrogen is related to autophagy in osteocytes. Thirty adult female rats were sham-operated (SHAM) or ovariectomized (OVX). After three weeks, twelve rats of SHAM and OVX groups were killed before treatment (basal period), whereas the remaining rats received estrogen (OVXE) or vehicle (OVX) for 45 days. Fragments of maxilla containing alveolar process of the first molars were embedded in paraffin or Araldite. Paraffin-sections were stained with hematoxylin/eosin for histomorphometry, or subjected to the silver impregnation method for morphological analysis of osteocyte cytoplasmic processes. Autophagy was analyzed by immunohistochemical detections of beclin-1, MAP-LC3α and p62, whereas apoptosis was evaluated by immunohistochemical detections of cleaved caspase-3 and BAX, TUNEL (Terminal deoxynucleotidyl transferase dUTP nick end labeling) method and by ultrastructural analysis. Araldite-semithin sections were subjected to the Sudan-black method for detection of lipids. OVX-basal group showed high frequency of caspase-3-, TUNEL- and p62-positive osteocytes accompanied with low frequency of beclin-1- and MAP-LC3α-positive osteocytes. At 45 days, OVXE group exhibited higher number of osteocytes, higher frequency of beclin-1- and MAP-LC3α-positive osteocytes, and lower frequency of caspase-3, BAX-, TUNEL- and p62-positive osteocytes than OVX group. Significant reduction in bone area was observed in the OVX compared to OVXE and SHAM groups. The highest frequency of Sudan-Black-positive osteocytes and osteocytes with scarce cytoplasmic processes, or showing apoptotic features were mainly observed in OVX groups. Our results indicate that estrogen deficiency decreases autophagy and increases apoptosis, whereas estrogen replacement enhances osteocyte viability by inhibiting apoptosis and maintaining autophagy in alveolar process osteocytes. These results suggest that the anti-apoptotic effect of estrogen may be, at least in part, related to autophagy regulation in osteocytes.
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Affiliation(s)
- Rinaldo Florencio-Silva
- Universidade Federal de São Paulo - UNIFESP, Escola Paulista de Medicina - EPM, Departamento de Morfologia e Genética, Disciplina de Histologia e Biologia Estrutural, São Paulo, SP, Brazil
| | - Gisela R S Sasso
- Universidade Federal de São Paulo - UNIFESP, Escola Paulista de Medicina - EPM, Departmento de Ginecologia, São Paulo, SP, Brazil
| | - Estela Sasso-Cerri
- São Paulo State University (UNESP), School of Dentistry, Araraquara - Laboratory of Histology and Embryology, Araraquara, SP, Brazil
| | - Manuel J Simões
- Universidade Federal de São Paulo - UNIFESP, Escola Paulista de Medicina - EPM, Departamento de Morfologia e Genética, Disciplina de Histologia e Biologia Estrutural, São Paulo, SP, Brazil
| | - Paulo S Cerri
- São Paulo State University (UNESP), School of Dentistry, Araraquara - Laboratory of Histology and Embryology, Araraquara, SP, Brazil.
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45
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Wei J, Li M, Gao F, Zeng R, Liu G, Li K. Multiple analyses of large-scale genome-wide association study highlight new risk pathways in lumbar spine bone mineral density. Oncotarget 2017; 7:31429-39. [PMID: 27119226 PMCID: PMC5058768 DOI: 10.18632/oncotarget.8948] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 03/29/2016] [Indexed: 11/25/2022] Open
Abstract
Osteoporosis is a common human complex disease. It is mainly characterized by low bone mineral density (BMD) and low-trauma osteoporotic fractures (OF). Until now, a large proportion of heritability has yet to be explained. The existing large-scale genome-wide association studies (GWAS) provide strong support for the investigation of osteoporosis mechanisms using pathway analysis. Recent findings showed that different risk pathways may be involved in BMD in different tissues. Here, we conducted multiple pathway analyses of a large-scale lumbar spine BMD GWAS dataset (2,468,080 SNPs and 31,800 samples) using two published gene-based analysis software including ProxyGeneLD and the PLINK. Using BMD genes from ProxyGeneLD, we identified 51 significant KEGG pathways with adjusted P<0.01. Using BMD genes from PLINK, we identified 38 significant KEGG pathways with adjusted P<0.01. Interestingly, 33 pathways are shared in both methods. In summary, we not only identified the known risk pathway such as Wnt signaling, in which the top GWAS variants are significantly enriched, but also highlight some new risk pathways. Interestingly, evidence from further supports the involvement of these pathways in MBD.
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Affiliation(s)
- Jinsong Wei
- Department of Orthopedic Surgery, Affiliated Hospital of Guangdong Medical University, Zhanjiang, China
| | - Ming Li
- Departmentof Endocrinology and Metabolism, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
| | - Feng Gao
- Department of Trauma and Emergency Surgeon, The Second Affiliated Hospital, Harbin Medical University, Harbin, China
| | - Rong Zeng
- Department of Orthopedic Surgery, Affiliated Hospital of Guangdong Medical University, Zhanjiang, China
| | - Guiyou Liu
- Genome Analysis Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, China
| | - Keshen Li
- Institute of Neurology, Affiliated Hospital of Guangdong Medical University, Zhanjiang, China.,Stroke Center, Neurology & Neurosurgery Division, The Clinical Medicine Research Institute & The First Affiliated Hospital, Jinan University, Guangzhou, China
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46
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He A, Wang W, Prakash NT, Tinkov AA, Skalny AV, Wen Y, Hao J, Guo X, Zhang F. Integrating genome-wide association study summaries and element-gene interaction datasets identified multiple associations between elements and complex diseases. Genet Epidemiol 2017; 42:168-173. [PMID: 29265413 DOI: 10.1002/gepi.22106] [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: 02/26/2017] [Revised: 11/08/2017] [Accepted: 11/08/2017] [Indexed: 12/17/2022]
Abstract
Chemical elements are closely related to human health. Extensive genomic profile data of complex diseases offer us a good opportunity to systemically investigate the relationships between elements and complex diseases/traits. In this study, we applied gene set enrichment analysis (GSEA) approach to detect the associations between elements and complex diseases/traits though integrating element-gene interaction datasets and genome-wide association study (GWAS) data of complex diseases/traits. To illustrate the performance of GSEA, the element-gene interaction datasets of 24 elements were extracted from the comparative toxicogenomics database (CTD). GWAS summary datasets of 24 complex diseases or traits were downloaded from the dbGaP or GEFOS websites. We observed significant associations between 7 elements and 13 complex diseases or traits (all false discovery rate (FDR) < 0.05), including reported relationships such as aluminum vs. Alzheimer's disease (FDR = 0.042), calcium vs. bone mineral density (FDR = 0.031), magnesium vs. systemic lupus erythematosus (FDR = 0.012) as well as novel associations, such as nickel vs. hypertriglyceridemia (FDR = 0.002) and bipolar disorder (FDR = 0.027). Our study results are consistent with previous biological studies, supporting the good performance of GSEA. Our analyzing results based on GSEA framework provide novel clues for discovering causal relationships between elements and complex diseases.
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Affiliation(s)
- Awen He
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Wenyu Wang
- Institute for Molecular Medicine Finland (FIMM), University of Helsinki, Helsinki, Finland
| | | | - Alexey A Tinkov
- Peoples' Friendship University of Russia (RUDN University), Moscow, Russia.,Yaroslavl State University, Yaroslavl, Russia
| | - Anatoly V Skalny
- Peoples' Friendship University of Russia (RUDN University), Moscow, Russia.,Yaroslavl State University, Yaroslavl, Russia.,Orenburg State University, Orenburg, Russia.,Trace Element Institute for UNESCO, Lyon, France
| | - Yan Wen
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Jingcan Hao
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Xiong Guo
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, P. R. China
| | - Feng Zhang
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, P. R. China
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47
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Sul OJ, Park HJ, Son HJ, Choi HS. Lipopolysaccharide (LPS)-Induced Autophagy Is Responsible for Enhanced Osteoclastogenesis. Mol Cells 2017; 40:880-887. [PMID: 29145718 PMCID: PMC5712518 DOI: 10.14348/molcells.2017.0230] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 10/12/2017] [Accepted: 10/16/2017] [Indexed: 11/27/2022] Open
Abstract
We hypothesized that inflammation affects number and activity of osteoclasts (OCs) via enhancing autophagy. Lipopolysaccharide (LPS) induced autophagy, osteoclastogenesis, and cytoplasmic reactive oxygen species (ROS) in bone marrow-derived macrophages that were pre-stimulated with receptor activator of nuclear factor-κB ligand. An autophagy inhibitor, 3-methyladenine (3-MA) decreased LPS-induced OC formation and bone resorption, indicating that autophagy is responsible for increasing number and activity of OCs upon LPS stimulus. Knockdown of autophagy-related protein 7 attenuated the effect of LPS on OC-specific genes, supporting a role of LPS as an autophagy inducer in OC. Removal of ROS decreased LPS-induced OC formation as well as autophagy. However, 3-MA did not affect LPS-induced ROS levels, suggesting that ROS act upstream of phosphatidylinositol-4,5-bisphosphate 3-kinase in LPS-induced autophagy. Our results suggest the possible use of autophagy inhibitors targeting OCs to reduce inflammatory bone loss.
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Affiliation(s)
- Ok-Joo Sul
- Department of Biological Sciences, University of Ulsan, Ulsan 44610,
Korea
| | - Hyun-Jung Park
- Department of Biological Sciences, University of Ulsan, Ulsan 44610,
Korea
| | - Ho-Jung Son
- Department of Biological Sciences, University of Ulsan, Ulsan 44610,
Korea
| | - Hye-Seon Choi
- Department of Biological Sciences, University of Ulsan, Ulsan 44610,
Korea
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48
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Qi M, Zhang L, Ma Y, Shuai Y, Li L, Luo K, Liu W, Jin Y. Autophagy Maintains the Function of Bone Marrow Mesenchymal Stem Cells to Prevent Estrogen Deficiency-Induced Osteoporosis. Theranostics 2017; 7:4498-4516. [PMID: 29158841 PMCID: PMC5695145 DOI: 10.7150/thno.17949] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 09/11/2017] [Indexed: 12/13/2022] Open
Abstract
Rationale: The impaired function of endogenous bone marrow mesenchymal stem cells (BMMSCs) is a determinant in the development of osteoporosis (OP). Recent researches have proved that autophagy plays an important role in maintenance of skeletal phenotype. However, whether autophagy affects the development of OP through regulating the function of BMMSCs remains elusive. Methods: Ovariectomy (OVX)-induced OP model and sham model were established in 8-week-old C57 mice. The differentiation and immunoregulation properties of BMMSCs from two models were examined by osteogenic/adipogenic induction in vitro and treatment of a dextran sulfate sodium (DSS)-induced mice colitis model in vivo. We evaluated autophagy activity in sham and OVX BMMSCs by quantitative real time-polymerase chain reaction (qRT-PCR), western blotting, laser confocal microscopy and transmission electron microscopy (TEM). Finally, to testify the effects of rapamycin, short hairpin RNA (shRNA) -BECN1 (shBECN1) and shRNA-ATG5 (shATG5), we performed Alizarin Red staining and Oil Red O staining to detect lineage differentiations of BMMSCs, and carried out micro-CT, calcein staining and Oil Red O staining to assess the skeletal phenotype. Results: BMMSCs from OVX-induced OP model mice exhibited decreased osteogenic differentiation, increased adipogenic differentiation and impaired immunoregulatory capacity. Furthermore, autophagy decreased both in bone marrow and BMMSCs of osteoporotic mice. Importantly, regulation of autophagy directly affects the functions of BMMSCs, including differentiation and immunoregulatory capacities. Moreover, treatment with rapamycin rescued the function of endogenous BMMSCs and attenuated the osteoporotic phenotype in OVX mice. Conclusion: Our findings suggest that autophagy regulates the regenerative function of BMMSCs and controls the development of OP. The restoration of autophagy by rapamycin may provide an effective therapeutic method for osteoporosis.
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Affiliation(s)
- Meng Qi
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China
- Xi'an Institute of Tissue Engineering and Regenerative Medicine, Xi'an, China
| | - Liqiang Zhang
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China
- Xi'an Institute of Tissue Engineering and Regenerative Medicine, Xi'an, China
| | - Yang Ma
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China
- Xi'an Institute of Tissue Engineering and Regenerative Medicine, Xi'an, China
| | - Yi Shuai
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China
- Xi'an Institute of Tissue Engineering and Regenerative Medicine, Xi'an, China
| | - Liya Li
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China
- Xi'an Institute of Tissue Engineering and Regenerative Medicine, Xi'an, China
| | - Kefu Luo
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Clinical Research Center for Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - Wenjia Liu
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China
- Xi'an Institute of Tissue Engineering and Regenerative Medicine, Xi'an, China
| | - Yan Jin
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, Fourth Military Medical University, Xi'an, China
- Xi'an Institute of Tissue Engineering and Regenerative Medicine, Xi'an, China
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49
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Wang W, Huang S, Hou W, Liu Y, Fan Q, He A, Wen Y, Hao J, Guo X, Zhang F. Integrative analysis of GWAS, eQTLs and meQTLs data suggests that multiple gene sets are associated with bone mineral density. Bone Joint Res 2017; 6:572-576. [PMID: 28978616 PMCID: PMC5670365 DOI: 10.1302/2046-3758.610.bjr-2017-0113.r1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Accepted: 07/05/2017] [Indexed: 11/15/2022] Open
Abstract
Objectives Several genome-wide association studies (GWAS) of bone mineral density (BMD) have successfully identified multiple susceptibility genes, yet isolated susceptibility genes are often difficult to interpret biologically. The aim of this study was to unravel the genetic background of BMD at pathway level, by integrating BMD GWAS data with genome-wide expression quantitative trait loci (eQTLs) and methylation quantitative trait loci (meQTLs) data Method We employed the GWAS datasets of BMD from the Genetic Factors for Osteoporosis Consortium (GEFOS), analysing patients’ BMD. The areas studied included 32 735 femoral necks, 28 498 lumbar spines, and 8143 forearms. Genome-wide eQTLs (containing 923 021 eQTLs) and meQTLs (containing 683 152 unique methylation sites with local meQTLs) data sets were collected from recently published studies. Gene scores were first calculated by summary data-based Mendelian randomisation (SMR) software and meQTL-aligned GWAS results. Gene set enrichment analysis (GSEA) was then applied to identify BMD-associated gene sets with a predefined significance level of 0.05. Results We identified multiple gene sets associated with BMD in one or more regions, including relevant known biological gene sets such as the Reactome Circadian Clock (GSEA p-value = 1.0 × 10-4 for LS and 2.7 × 10-2 for femoral necks BMD in eQTLs-based GSEA) and insulin-like growth factor receptor binding (GSEA p-value = 5.0 × 10-4 for femoral necks and 2.6 × 10-2 for lumbar spines BMD in meQTLs-based GSEA). Conclusion Our results provided novel clues for subsequent functional analysis of bone metabolism, and illustrated the benefit of integrating eQTLs and meQTLs data into pathway association analysis for genetic studies of complex human diseases. Cite this article: W. Wang, S. Huang, W. Hou, Y. Liu, Q. Fan, A. He, Y. Wen, J. Hao, X. Guo, F. Zhang. Integrative analysis of GWAS, eQTLs and meQTLs data suggests that multiple gene sets are associated with bone mineral density. Bone Joint Res 2017;6:572–576.
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Affiliation(s)
- W Wang
- School of Public Health, Department of Breast Surgery, First Affiliated Hospital, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - S Huang
- Department of Radiotherapy, Second Affiliated Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - W Hou
- Department of Joint Surgery, Osteonecrosis and Joint Reconstruction Ward, HongHui Hospital, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Y Liu
- Department of Breast Surgery, First Affiliated Hospital, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Q Fan
- School of Public Health, Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - A He
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Y Wen
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - J Hao
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - X Guo
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - F Zhang
- Key Laboratory of Trace Elements and Endemic Diseases of National Health and Family Planning Commission, School of Public Health, Health Science Center, Xi'an Jiaotong University, Xi'an, Shaanxi, China
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50
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Florencio-Silva R, Sasso GRDS, Simões MDJ, Simões RS, Baracat MCP, Sasso-Cerri E, Cerri PS. Osteoporosis and autophagy: What is the relationship? Rev Assoc Med Bras (1992) 2017; 63:173-179. [PMID: 28355379 DOI: 10.1590/1806-9282.63.02.173] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 05/31/2016] [Indexed: 01/19/2023] Open
Abstract
Autophagy is a survival pathway wherein non-functional proteins and organelles are degraded in lysosomes for recycling and energy production. Therefore, autophagy is fundamental for the maintenance of cell viability, acting as a quality control process that prevents the accumulation of unnecessary structures and oxidative stress. Increasing evidence has shown that autophagy dysfunction is related to several pathologies including neurodegenerative diseases and cancer. Moreover, recent studies have shown that autophagy plays an important role for the maintenance of bone homeostasis. For instance, in vitro and animal and human studies indicate that autophagy dysfunction in bone cells is associated with the onset of bone diseases such as osteoporosis. This review had the purpose of discussing the issue to confirm whether a relationship between autophagy dysfunction and osteoporosis exits.
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Affiliation(s)
- Rinaldo Florencio-Silva
- PhD, Postdoctoral Student, Department of Morphology and Genetics, Division of Histology and Structural Biology, Universidade Federal de São Paulo (Unifesp), São Paulo, SP, Brazil
| | | | - Manuel de Jesus Simões
- Full Professor of the Department of Morphology and Genetics, Division of Histology and Structural Biology, Unifesp, São Paulo, SP, Brazil
| | - Ricardo Santos Simões
- PhD, MD, Department of Obstetrics and Gynecology, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, SP, Brazil
| | | | - Estela Sasso-Cerri
- PhD, Adjunct Professor (Habilitation: BR. Livre-docente) of the Department of Morphology, Laboratory of Histology and Embryology, Faculty of Dentistry of Araraquara, Universidade Estadual Paulista (Unesp), Araraquara, SP, Brazil
| | - Paulo Sérgio Cerri
- PhD, Adjunct Professor (Habilitation: BR. Livre-docente) of the Department of Morphology, Laboratory of Histology and Embryology, Faculty of Dentistry of Araraquara, Universidade Estadual Paulista (Unesp), Araraquara, SP, Brazil
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