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Diao F, Chen K, Wang Y, Li Y, Xu W, Lu J, Chen YX. Involvement of small G protein RhoB in the regulation of proliferation, adhesion and migration by dexamethasone in osteoblastic cells. PLoS One 2017; 12:e0174273. [PMID: 28323887 PMCID: PMC5360316 DOI: 10.1371/journal.pone.0174273] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 03/06/2017] [Indexed: 12/02/2022] Open
Abstract
Long-term exposure to therapeutic doses of glucocorticoids (GCs) results in bone remodeling, which frequently causes osteoporosis and fracture healing retardation because of the abnormality of osteoblastic proliferation and differentiation. The mechanisms of GCs’ effect on osteoblasts are largely unknown. In this present study, we found that dexamethasone (Dex) could induce the expression of the small G protein, RhoB, in mRNA and protein levels in the osteoblast-derived osteosarcoma cell lines MG-63. The up-regulation of RhoB mRNA by Dex mainly occurs at posttranscriptional level by increasing its mRNA stability through PI-3K/Akt and p38 mitogen-activated protein kinase signaling pathways. Over-expression of RhoB in MG-63 cells magnified while down-regulation of RhoB level by RNA interference impaired Dex-induced growth inhibition but not differentiation. What’s more, over-expression of RhoB mimicked the effect of Dex on cell adhesion and migration. And interfering RhoB expression partially suppressed Dex-induced pro-adhesion and anti-migration in MG-63 cells. In conclusion, these results indicate that RhoB plays an important role in the pathological effect of Dex on osteoblastic growth and migration, which is a part of the mechanisms of GCs’ adverse effect on bone remodeling.
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Affiliation(s)
- Fei Diao
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
| | - Kangyao Chen
- Department of Orthopedics, Changhai Hospital affiliated to Second Military Medical University, Shanghai, China
- Department of -Orthopedics, Fuzhou Second Hospital affiliated to Xiamen University, Fuzhou, Fujian Province, China
| | - Yan Wang
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
| | - Yidong Li
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
| | - Weidong Xu
- Department of Orthopedics, Changhai Hospital affiliated to Second Military Medical University, Shanghai, China
| | - Jian Lu
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
- * E-mail: (JL); (YXC)
| | - Yu-Xia Chen
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
- * E-mail: (JL); (YXC)
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Luo X, Chen J, Song WX, Tang N, Luo J, Deng ZL, Sharff KA, He G, Bi Y, He BC, Bennett E, Huang J, Kang Q, Jiang W, Su Y, Zhu GH, Yin H, He Y, Wang Y, Souris JS, Chen L, Zuo GW, Montag AG, Reid RR, Haydon RC, Luu HH, He TC. Osteogenic BMPs promote tumor growth of human osteosarcomas that harbor differentiation defects. J Transl Med 2008; 88:1264-77. [PMID: 18838962 PMCID: PMC9901484 DOI: 10.1038/labinvest.2008.98] [Citation(s) in RCA: 167] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Osteosarcoma (OS) is the most common primary malignancy of bone. Here, we investigated a possible role of defective osteoblast differentiation in OS tumorigenesis. We found that basal levels of the early osteogenic marker alkaline phosphatase (ALP) activity were low in OS lines. Osteogenic regulators Runx2 and OSX, and the late marker osteopontin (OPN) expressed at low levels in most OS lines, indicating that most OS cells fail to undergo terminal differentiation. Furthermore, OS cells were refractory to osteogenic BMP-induced increases in ALP activity. Osteogenic BMPs were shown to upregulate early target genes, but not late osteogenic markers OPN and osteocalcin (OC). Furthermore, osteogenic BMPs failed to induce bone formation from human OS cells, rather effectively promoted OS tumor growth in an orthotopic OS model. Exogenous expression of early target genes enhanced BMP-stimulated OS tumor growth, whereas osteogenic BMP-promoted OS tumor growth was inhibited by exogenous Runx2 expression. These results suggest that alterations in osteoprogenitors may disrupt osteogenic differentiation pathway. Thus, identifying potential differentiation defects in OS tumors would allow us to reconstruct the tumorigenic events in osteoprogenitors and to develop rational differentiation therapies for clinical OS management.
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Affiliation(s)
- Xiaoji Luo
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA,These authors contributed equally to this work
| | - Jin Chen
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA,These authors contributed equally to this work
| | - Wen-Xin Song
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Ni Tang
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Jinyong Luo
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Zhong-Liang Deng
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Katie A Sharff
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Gary He
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA,Department of Pathology, The University of Chicago, Chicago, IL, USA
| | - Yang Bi
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Bai-Cheng He
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Erwin Bennett
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Jiayi Huang
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Quan Kang
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Wei Jiang
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Yuxi Su
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Gao-Hui Zhu
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Hong Yin
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Yun He
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Yi Wang
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Jeffrey S Souris
- Optical Imaging Core Facility, The University of Chicago, Chicago, IL, USA,Department of Radiology, The University of Chicago, Chicago, IL, USA
| | - Liang Chen
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Guo-Wei Zuo
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Anthony G Montag
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA,Department of Pathology, The University of Chicago, Chicago, IL, USA
| | - Russell R Reid
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Rex C Haydon
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Hue H Luu
- Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
| | - Tong-Chuan He
- Key Laboratory of Diagnostic Medicine designated by the Chinese Ministry of Education and the Department of Pediatric Surgery, the Children’s Hospital of Chongqing Medical University, Chongqing, China,Molecular Oncology Laboratory, Department of Surgery, The University of Chicago, Chicago, IL, USA
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