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Entezari A, Wu Q, Mirkhalaf M, Lu Z, Roohani I, Li Q, Dunstan CR, Jiang X, Zreiqat H. Unraveling the influence of channel size and shape in 3D printed ceramic scaffolds on osteogenesis. Acta Biomater 2024:S1742-7061(24)00193-4. [PMID: 38642786 DOI: 10.1016/j.actbio.2024.04.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 03/31/2024] [Accepted: 04/11/2024] [Indexed: 04/22/2024]
Abstract
Bone has the capacity to regenerate itself for relatively small defects; however, this regenerative capacity is diminished in critical-size bone defects. The development of synthetic materials has risen as a distinct strategy to address this challenge. Effective synthetic materials to have emerged in recent years are bioceramic implants, which are biocompatible and highly bioactive. Yet nothing suitable for the repair of large bone defects has made the transition from laboratory to clinic. The clinical success of bioceramics has been shown to depend not only on the scaffold's intrinsic material properties but also on its internal porous geometry. This study aimed to systematically explore the implications of varying channel size, shape, and curvature in tissue scaffolds on in vivo bone regeneration outcomes. 3D printed bioceramic scaffolds with varying channel sizes (0.3 mm to 1.5 mm), shapes (circular vs rectangular), and curvatures (concave vs convex) were implanted in rabbit femoral defects for 8 weeks, followed by histological evaluation. We demonstrated that circular channel sizes of around 0.9 mm diameter significantly enhanced bone formation, compared to channel with diameters of 0.3 mm and 1.5 mm. Interestingly, varying channel shapes (rectangular vs circular) had no significant effect on the volume of newly formed bone. Furthermore, the present study systematically demonstrated the beneficial effect of concave surfaces on bone tissue growth in vivo, reinforcing previous in silico and in vitro findings. This study demonstrates that optimizing architectural configurations within ceramic scaffolds is crucial in enhancing bone regeneration outcomes. STATEMENT OF SIGNIFICANCE: Despite the explosion of work on developing synthetic scaffolds to repair bone defects, the amount of new bone formed by scaffolds in vivo remains suboptimal. Recent studies have illuminated the pivotal role of scaffolds' internal architecture in osteogenesis. However, these investigations have mostly remained confined to in silico and in vitro experiments. Among the in vivo studies conducted, there has been a lack of systematic analysis of individual architectural features. Herein, we utilized bioceramic 3D printing to conduct a systematic exploration of the effects of channel size, shape, and curvature on bone formation in vivo. Our results demonstrate the significant influence of channel size and curvature on in vivo outcomes. These findings provide invaluable insights into the design of more effective bone scaffolds.
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Affiliation(s)
- Ali Entezari
- School of Biomedical Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, NSW 2007, Australia; Tissue Engineering and Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia
| | - Qianju Wu
- Department of Prosthodontics, Oral Bioengineering, and Regenerative Medicine Lab, Ninth People's Hospital, Shanghai Jiao Tong University, Shanghai 200011, China; Stomatological Hospital of Xiamen Medical College, Xiamen Key Laboratory of Stomatological Disease Diagnosis and Treatment, Xiamen, Fujian, China
| | - Mohammad Mirkhalaf
- School of Mechanical, Medical and Process Engineering, Queensland University of Technology, 2 George St Brisbane, QLD 4000, Australia; Centre for Biomedical Technologies, Queensland University of Technology (QUT), Brisbane, QLD 4059, Australia; Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, QLD 4000, Australia
| | - Zufu Lu
- Tissue Engineering and Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia
| | - Iman Roohani
- Tissue Engineering and Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia
| | - Qing Li
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Colin R Dunstan
- Tissue Engineering and Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia
| | - Xinquan Jiang
- Department of Prosthodontics, Oral Bioengineering, and Regenerative Medicine Lab, Ninth People's Hospital, Shanghai Jiao Tong University, Shanghai 200011, China.
| | - Hala Zreiqat
- Tissue Engineering and Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia.
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2
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Holmes NP, Roohani I, Entezari A, Guagliardo P, Mirkhalaf M, Lu Z, Chen YS, Yang L, Dunstan CR, Zreiqat H, Cairney JM. Discovering an unknown territory using atom probe tomography: Elemental exchange at the bioceramic scaffold/bone tissue interface. Acta Biomater 2023; 162:199-210. [PMID: 36893955 DOI: 10.1016/j.actbio.2023.02.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 02/08/2023] [Accepted: 02/28/2023] [Indexed: 03/09/2023]
Abstract
Here we report the first atom probe study to reveal the atomic-scale composition of in vivo bone formed in a bioceramic scaffold (strontium-hardystonite-gahnite) after 12-month implantation in a large bone defect in sheep tibia. The composition of the newly formed bone tissue differs to that of mature cortical bone tissue, and elements from the degrading bioceramic implant, particularly aluminium (Al), are present in both the newly formed bone and in the original mature cortical bone tissue at the perimeter of the bioceramic implant. Atom probe tomography confirmed that the trace elements are released from the bioceramic and are actively transported into the newly formed bone. NanoSIMS mapping, as a complementary technique, confirmed the distribution of the released ions from the bioceramic into the newly formed bone tissue within the scaffold. This study demonstrated the combined benefits of atom probe and nanoSIMS in assessing nanoscopic chemical composition changes at precise locations within the tissue/biomaterial interface. Such information can assist in understanding the interaction of scaffolds with surrounding tissue, hence permitting further iterative improvements to the design and performance of biomedical implants, and ultimately reducing the risk of complications or failure while increasing the rate of tissue formation. STATEMENT OF SIGNIFICANCE: The repair of critical-sized load-bearing bone defects is a challenge, and precisely engineered bioceramic scaffold implants is an emerging potential treatment strategy. However, we still do not understand the effect of the bioceramic scaffold implants on the composition of newly formed bone in vivo and surrounding existing mature bone. This article reports an innovative route to solve this problem, the combined power of atom probe tomography and nanoSIMS is used to spatially define elemental distributions across bioceramic implant sites. We determine the nanoscopic chemical composition changes at the Sr-HT Gahnite bioceramic/bone tissue interface, and importantly, provide the first report of in vivo bone tissue chemical composition formed in a bioceramic scaffold.
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Affiliation(s)
- Natalie P Holmes
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia; School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia; The University of Sydney Nano Institute, Faculty of Science, University of Sydney, Sydney, NSW 2006, Australia.
| | - Iman Roohani
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia; Australian Research Council Training Centre for Innovative Bioengineering, Sydney, NSW 2006, Australia
| | - Ali Entezari
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia; School of Biomedical Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, NSW 2007, Australia
| | - Paul Guagliardo
- Centre for Microscopy, Characterisation and Analysis, University of Western Australia, Perth, WA 6009, Australi
| | - Mohammad Mirkhalaf
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia; Australian Research Council Training Centre for Innovative Bioengineering, Sydney, NSW 2006, Australia; School of Mechanical, Medical and Process Engineering, Queensland University of Technology, 2 George St Brisbane, QLD 4000, Australia
| | - Zufu Lu
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia; Australian Research Council Training Centre for Innovative Bioengineering, Sydney, NSW 2006, Australia
| | - Yi-Sheng Chen
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia; School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia
| | - Limei Yang
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia; School of Civil & Environmental Engineering, University of Technology Sydney, 81 Broadway, Ultimo, NSW 2007, Australia
| | - Colin R Dunstan
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia; Australian Research Council Training Centre for Innovative Bioengineering, Sydney, NSW 2006, Australia
| | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW 2006, Australia; Australian Research Council Training Centre for Innovative Bioengineering, Sydney, NSW 2006, Australia.
| | - Julie M Cairney
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia; School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia
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3
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Lu Z, Jiang L, Lesani P, Zhang W, Li N, Luo D, Li Y, Ye Y, Bian J, Wang G, Dunstan CR, Jiang X, Zreiqat H. Nicotinamide Mononucleotide Alleviates Osteoblast Senescence Induction and Promotes Bone Healing in Osteoporotic Mice. J Gerontol A Biol Sci Med Sci 2023; 78:186-194. [PMID: 36037105 DOI: 10.1093/gerona/glac175] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Indexed: 11/13/2022] Open
Abstract
Combating the accumulated senescent cells and the healing of osteoporotic bone fractures in the older remains a significant challenge. Nicotinamide mononucleotide (NMN), a precursor of NAD+, is an excellent candidate for mitigating aging-related disorders. However, it is unknown if NMN can alleviate senescent cell induction and enhance osteoporotic bone fracture healing. Here we show that NMN treatment partially reverses the effects of tumor necrosis factor-alpha (TNF-α) on human primary osteoblasts (HOBs): senescent cell induction, diminished osteogenic differentiation ability, and intracellular NAD+ and NADH levels. Mechanistically, NMN restores the mitochondrial dysfunction in HOBs induced by TNF-α evidenced by increased mitochondrial membrane potential and reduced reactive oxidative species and mitochondrial mass. NMN also increases mitophagy activity by down-regulating P62 expression and up-regulating light chain 3B-II protein expression. In addition, the cell senescence protective effects of NMN on HOBs are mitigated by a mitophagy inhibitor (Bafilomycin A1). In vivo, NMN supplementation attenuates senescent cell induction in growth plates, partially prevents osteoporosis in an ovariectomized mouse model, and accelerates bone healing in osteoporotic mice. We conclude that NMN can be a novel and promising therapeutic candidate to enhance bone fracture healing capacity in the older.
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Affiliation(s)
- ZuFu Lu
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, the University of Sydney, Sydney, New South Wales, Australia.,ARC Training Centre for Innovative BioEngineering, the University of Sydney, Sydney, New South Wales, Australia
| | - Liting Jiang
- Department of Stomatology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine.,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Pooria Lesani
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, the University of Sydney, Sydney, New South Wales, Australia.,ARC Training Centre for Innovative BioEngineering, the University of Sydney, Sydney, New South Wales, Australia
| | - WenJie Zhang
- Department of Prosthodontics, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine.,National Clinical Research Center for Oral diseases, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai, China
| | - Ning Li
- Department of Stomatology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine.,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Danyang Luo
- Department of Stomatology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine.,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Yusi Li
- Department of Stomatology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine.,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Yulin Ye
- Department of Stomatology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine.,College of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Ji Bian
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, the University of Sydney, Sydney, New South Wales, Australia
| | - Guocheng Wang
- Research Center for Human Tissues and Organs Degeneration, Shenzhen Institute of Advanced Technology, Chinese Academy of Science, Shenzhen, Guangdong, China
| | - Colin R Dunstan
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, the University of Sydney, Sydney, New South Wales, Australia.,ARC Training Centre for Innovative BioEngineering, the University of Sydney, Sydney, New South Wales, Australia
| | - XinQuan Jiang
- Department of Prosthodontics, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine.,National Clinical Research Center for Oral diseases, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai, China
| | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, the University of Sydney, Sydney, New South Wales, Australia.,ARC Training Centre for Innovative BioEngineering, the University of Sydney, Sydney, New South Wales, Australia
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4
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Rahman MK, Umashankar B, Choucair H, Pazderka C, Bourget K, Chen Y, Dunstan CR, Rawling T, Murray M. Inclusion of the in-chain sulfur in 3-thiaCTU increases the efficiency of mitochondrial targeting and cell killing by anticancer aryl-urea fatty acids. Eur J Pharmacol 2023; 939:175470. [PMID: 36543287 DOI: 10.1016/j.ejphar.2022.175470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/14/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022]
Abstract
Mitochondria in tumor cells are functionally different from those in normal cells and could be targeted to develop new anticancer agents. We showed recently that the aryl-ureido fatty acid CTU is the prototype of a new class of mitochondrion-targeted agents that kill cancer cells by increasing the production of reactive oxygen species (ROS), activating endoplasmic reticulum (ER)-stress and promoting apoptosis. However, prolonged treatment with high doses of CTU were required for in vivo anti-tumor activity. Thus, new strategies are now required to produce agents that have enhanced anticancer activity over CTU. In the present study we prepared a novel aryl-urea termed 3-thiaCTU, that contained an in-chain sulfur heteroatom, for evaluation in tumor cell lines and in mice carrying tumor xenografts. The principal finding to emerge was that 3-thiaCTU was several-fold more active than CTU in the activation of aryl-urea mechanisms that promoted cancer cell killing. Thus, in in vitro studies 3-thiaCTU disrupted the mitochondrial membrane potential, increased ROS production, activated ER-stress and promoted tumor cell apoptosis more effectively than CTU. 3-ThiaCTU was also significantly more active than CTUin vivo in mice that carried MDA-MB-231 cell xenografts. Compared to CTU, 3-thiaCTU prevented tumor growth more effectively and at much lower doses. These findings indicate that, in comparison to CTU, 3-thiaCTU is an aryl-urea with markedly enhanced activity that could now be suitable for development as a novel anticancer agent.
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Affiliation(s)
- Md Khalilur Rahman
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, and School of Pharmacy, Faculty of Medicine and Health, University of Sydney, New South Wales, 2006, Australia
| | - Balasubrahmanyam Umashankar
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, and School of Pharmacy, Faculty of Medicine and Health, University of Sydney, New South Wales, 2006, Australia
| | - Hassan Choucair
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, and School of Pharmacy, Faculty of Medicine and Health, University of Sydney, New South Wales, 2006, Australia
| | - Curtis Pazderka
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Ultimo, New South Wales, 2007, Australia
| | - Kirsi Bourget
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, and School of Pharmacy, Faculty of Medicine and Health, University of Sydney, New South Wales, 2006, Australia
| | - Yongjuan Chen
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, and School of Pharmacy, Faculty of Medicine and Health, University of Sydney, New South Wales, 2006, Australia; Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, University of Sydney, New South Wales, 2006, Australia
| | - Colin R Dunstan
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, University of Sydney, New South Wales, 2006, Australia
| | - Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Ultimo, New South Wales, 2007, Australia
| | - Michael Murray
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, and School of Pharmacy, Faculty of Medicine and Health, University of Sydney, New South Wales, 2006, Australia.
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5
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Newsom ET, Sadeghpour A, Entezari A, Vinzons JLU, Stanford RE, Mirkhalaf M, Chon D, Dunstan CR, Zreiqat H. Design and evaluation of 3D-printed Sr-HT-Gahnite bioceramic for FDA regulatory submission: A Good Laboratory Practice sheep study. Acta Biomater 2023; 156:214-221. [PMID: 35063706 DOI: 10.1016/j.actbio.2022.01.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/13/2021] [Accepted: 01/14/2022] [Indexed: 01/18/2023]
Abstract
There is an unmet clinical need for a spinal fusion implant material that recapitulates the biological and mechanical performance of natural bone. We have developed a bioceramic, Sr-HT-Gahnite, which has been identified as a potential fusion device material. This material has the capacity to transform the future of the global interbody devices market, with follow on social, economic, and environmental benefits, rooted in its remarkable combination of mechanical properties and bioactivity. In this study, and in line with FDA requirements, the in vivo preclinical systemic biological safety of a Sr-HT-Gahnite interbody fusion device is assessed over 26 weeks in sheep under good laboratory practice (GLP). Following the in-life phase, animals are assessed for systemic biological effects via blood haematology and clinical biochemistry, strontium dosage analysis in the blood and wool, and histopathology examination of the distant organs including adrenals, brain, heart, kidneys, liver, lungs and bronchi, skeletal muscle, spinal nerves close to the implanted sites, ovaries, and draining lymph nodes. Our results show that no major changes in blood haematology or biochemistry parameters are observed, no systemic distribution of strontium to the blood and wool, and no macroscopic or histopathological abnormalities in the distant organs when Sr-HT-Gahnite was implanted, compared to baseline and control values. Together, these results indicate the systemic safety of the Sr-HT-Gahnite interbody fusion device. The results of this study extend to the systemic safety of other Sr-HT-Gahnite implanted medical devices in contact with bone or tissue, of similar size and manufactured using the described processes. STATEMENT OF SIGNIFICANCE: This paper is considered original and innovative as it is the first that thoroughly reports the systemic biological safety of previously undescribed bioceramic material, Sr-HT-Gahnite. The study has been performed under good laboratory practice, in line with FDA requirements for assessment of a new interbody fusion device, making the results broadly applicable to the translation of sheep models to the human cervical spine; and also the translation of Sr-HT-Gahnite as a biomaterial for use in additional applications. We expect this study to be of broad interest to the readership of Acta Biomaterilia. Its findings are directly applicable to researchers and clinicians working in bone repair and the development of synthetic biomaterials.
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Affiliation(s)
- Ellen T Newsom
- Allegra Orthopaedics, 18-20 Orion Rd, Lane Cove West, NSW, 2066, Australia; Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW, 2006, Australia
| | - Ameneh Sadeghpour
- Allegra Orthopaedics, 18-20 Orion Rd, Lane Cove West, NSW, 2066, Australia
| | - Ali Entezari
- Allegra Orthopaedics, 18-20 Orion Rd, Lane Cove West, NSW, 2066, Australia; Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW, 2006, Australia
| | | | - Ralph E Stanford
- Faculty of Medicine, University of New South Wales, NSW, 2052, Australia
| | - Mohammad Mirkhalaf
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW, 2006, Australia; Australian Research Council Training Centre for Innovative Bioengineering, Sydney, NSW, 2006, Australia
| | - Daniel Chon
- CTL Amedica, 4550 Excel Pkwy #300, Addison, TX, 75001, United States
| | - Colin R Dunstan
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW, 2006, Australia; Australian Research Council Training Centre for Innovative Bioengineering, Sydney, NSW, 2006, Australia
| | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research Unit, School of Biomedical Engineering, The University of Sydney, NSW, 2006, Australia; Australian Research Council Training Centre for Innovative Bioengineering, Sydney, NSW, 2006, Australia.
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Wahed SB, Dunstan CR, Boughton PA, Ruys AJ, Faisal SN, Wahed TB, Salahuddin B, Cheng X, Zhou Y, Wang CH, Islam MS, Aziz S. Functional Ultra-High Molecular Weight Polyethylene Composites for Ligament Reconstructions and Their Targeted Applications in the Restoration of the Anterior Cruciate Ligament. Polymers (Basel) 2022; 14:polym14112189. [PMID: 35683861 PMCID: PMC9182730 DOI: 10.3390/polym14112189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 05/20/2022] [Accepted: 05/25/2022] [Indexed: 11/16/2022] Open
Abstract
The selection of biomaterials as biomedical implants is a significant challenge. Ultra-high molecular weight polyethylene (UHMWPE) and composites of such kind have been extensively used in medical implants, notably in the bearings of the hip, knee, and other joint prostheses, owing to its biocompatibility and high wear resistance. For the Anterior Cruciate Ligament (ACL) graft, synthetic UHMWPE is an ideal candidate due to its biocompatibility and extremely high tensile strength. However, significant problems are observed in UHMWPE based implants, such as wear debris and oxidative degradation. To resolve the issue of wear and to enhance the life of UHMWPE as an implant, in recent years, this field has witnessed numerous innovative methodologies such as biofunctionalization or high temperature melting of UHMWPE to enhance its toughness and strength. The surface functionalization/modification/treatment of UHMWPE is very challenging as it requires optimizing many variables, such as surface tension and wettability, active functional groups on the surface, irradiation, and protein immobilization to successfully improve the mechanical properties of UHMWPE and reduce or eliminate the wear or osteolysis of the UHMWPE implant. Despite these difficulties, several surface roughening, functionalization, and irradiation processing technologies have been developed and applied in the recent past. The basic research and direct industrial applications of such material improvement technology are very significant, as evidenced by the significant number of published papers and patents. However, the available literature on research methodology and techniques related to material property enhancement and protection from wear of UHMWPE is disseminated, and there is a lack of a comprehensive source for the research community to access information on the subject matter. Here we provide an overview of recent developments and core challenges in the surface modification/functionalization/irradiation of UHMWPE and apply these findings to the case study of UHMWPE for ACL repair.
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Affiliation(s)
- Sonia B. Wahed
- School of Biomedical Engineering, University of Sydney, Sydney, NSW 2006, Australia; (C.R.D.); (P.A.B.); (A.J.R.); (X.C.)
- Correspondence: (S.B.W.); (S.A.)
| | - Colin R. Dunstan
- School of Biomedical Engineering, University of Sydney, Sydney, NSW 2006, Australia; (C.R.D.); (P.A.B.); (A.J.R.); (X.C.)
| | - Philip A. Boughton
- School of Biomedical Engineering, University of Sydney, Sydney, NSW 2006, Australia; (C.R.D.); (P.A.B.); (A.J.R.); (X.C.)
| | - Andrew J. Ruys
- School of Biomedical Engineering, University of Sydney, Sydney, NSW 2006, Australia; (C.R.D.); (P.A.B.); (A.J.R.); (X.C.)
| | - Shaikh N. Faisal
- ARC Centre of Excellence for Electromaterials Science & Intelligent Polymer Research Institute, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW 2522, Australia;
| | - Tania B. Wahed
- Department of Pharmacy, Jahangirnagar University, Savar 1342, Bangladesh;
| | - Bidita Salahuddin
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia;
| | - Xinying Cheng
- School of Biomedical Engineering, University of Sydney, Sydney, NSW 2006, Australia; (C.R.D.); (P.A.B.); (A.J.R.); (X.C.)
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia; (Y.Z.); (C.H.W.); (M.S.I.)
| | - Yang Zhou
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia; (Y.Z.); (C.H.W.); (M.S.I.)
| | - Chun H. Wang
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia; (Y.Z.); (C.H.W.); (M.S.I.)
| | - Mohammad S. Islam
- School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia; (Y.Z.); (C.H.W.); (M.S.I.)
| | - Shazed Aziz
- School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia;
- Correspondence: (S.B.W.); (S.A.)
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7
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Al-Zubaidi Y, Chen Y, Khalilur Rahman M, Umashankar B, Choucair H, Bourget K, Chung L, Qi Y, Witting PK, Anderson RL, O'Neill GM, Dunstan CR, Rawling T, Murray M. PTU, a novel ureido-fatty acid, inhibits MDA-MB-231 cell invasion and dissemination by modulating Wnt5a secretion and cytoskeletal signaling. Biochem Pharmacol 2021; 192:114726. [PMID: 34389322 DOI: 10.1016/j.bcp.2021.114726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/02/2021] [Accepted: 08/06/2021] [Indexed: 11/26/2022]
Abstract
Migration and invasion promote tumor cell metastasis, which is the leading cause of cancer death. At present there are no effective treatments. Epidemiological studies have suggested that ω-3 polyunsaturated fatty acids (PUFA) may decrease cancer aggressiveness. In recent studies epoxide metabolites of ω-3 PUFA exhibited anti-cancer activity, although increased in vivo stability is required to develop useful drugs. Here we synthesized novel stabilized ureido-fatty acid ω-3 epoxide isosteres and found that one analogue - p-tolyl-ureidopalmitic acid (PTU) - inhibited migration and invasion by MDA-MB-231 breast cancer cells in vitro and in vivo in xenografted nu/nu mice. From proteomics analysis of PTU-treated cells major regulated pathways were linked to the actin cytoskeleton and actin-based motility. The principal finding was that PTU impaired the formation of actin protrusions by decreasing the secretion of Wnt5a, which dysregulated the Wnt/planar cell polarity (PCP) pathway and actin cytoskeletal dynamics. Exogenous Wnt5a restored invasion and Wnt/PCP signalling in PTU-treated cells. PTU is the prototype of a novel class of agents that selectively dysregulate the Wnt/PCP pathway by inhibiting Wnt5a secretion and actin dynamics to impair MDA-MB-231 cell migration and invasion.
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Affiliation(s)
- Yassir Al-Zubaidi
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia; College of Pharmacy, The University of Mashreq, Baghdad, Iraq
| | - Yongjuan Chen
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Md Khalilur Rahman
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Bala Umashankar
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Hassan Choucair
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Kirsi Bourget
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Long Chung
- Centenary Institute, The University of Sydney, NSW 2050, Australia
| | - Yanfei Qi
- Centenary Institute, The University of Sydney, NSW 2050, Australia
| | - Paul K Witting
- Discipline of Pathology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Robin L Anderson
- Translational Breast Cancer Program, Olivia Newton-John Cancer Research Institute, Heidelberg, VIC 3084, Australia; School of Cancer Medicine, La Trobe University, Bundoora, VIC 3083, Australia
| | - Geraldine M O'Neill
- Children's Cancer Research Unit, the Children's Hospital at Westmead, Westmead, NSW 2145, Australia; Children's Hospital Westmead Clinical School, Faculty of Medicine and Health, University of Sydney, NSW 2006, Australia
| | - Colin R Dunstan
- School of Biomedical Engineering, University of Sydney, NSW 2006, Australia
| | - Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Michael Murray
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia.
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8
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Lu Z, Zhang W, No YJ, Lu Y, Mirkhalaf Valashani SM, Rollet P, Jiang L, Ramaswamy Y, Dunstan CR, Jiang X, Zreiqat H. Baghdadite Ceramics Prevent Senescence in Human Osteoblasts and Promote Bone Regeneration in Aged Rats. ACS Biomater Sci Eng 2020; 6:6874-6885. [PMID: 33320606 DOI: 10.1021/acsbiomaterials.0c01120] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Bone fractures and critical-sized bone defects present significant health threats for the elderly who have limited capacity for regeneration due to the presence of functionally compromised senescent cells. A wide range of synthetic materials has been developed to promote the regeneration of critical-sized bone defects, but it is largely unknown if a synthetic biomaterial (scaffold) can modulate cellular senescence and improve bone regeneration in aged scenarios. The current study investigates the interaction of Baghdadite (Ca3ZrSi2O9) ceramic scaffolds with senescent human primary osteoblast-like cells (HOBs) and its bone regeneration capacity in aged rats. A senescent HOB model was established by repeatedly passaging HOBs till passage 7 (P7). Compared to the clinically used hydroxyapatite/tricalcium phosphate (HA/TCP), Baghdadite prevented senescence induction in P7 HOBs and markedly negated the paracrine effect of P7 HOB secretomes that mediated the up-regulations of cellular senescence-associated gene expression levels in P2 HOBs. We further demonstrated that conditioned media extracted from Baghdadite corrected the dysfunctional mitochondria in P7 HOBs. In vivo, the bone regeneration capacity was enhanced when 3D printed Baghdadite scaffolds were implanted in a calvaria critical-sized bone defect model in both young and aged rats compared to HA/TCP scaffolds, but a better effect was observed in aged rats than in young rats. This study suggests that Baghdadite ceramic represents a novel and promising biomaterial approach to promote bone regeneration capacity in the elderly by providing an anti-senescent microenvironment.
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Affiliation(s)
- ZuFu Lu
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, Sydney, NSW 2006, Australia.,ARC Training Centre for Innovative BioEngineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - WenJie Zhang
- Department of Prosthodontics, Shanghai Ninth People's Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,National Clinical Research Center of Stomatology, Shanghai 200011, China.,Oral Bioengineering and Regenerative Medicine Lab, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai 200011, China
| | - Young Jung No
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, Sydney, NSW 2006, Australia.,ARC Training Centre for Innovative BioEngineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Yuezhi Lu
- Department of Prosthodontics, Shanghai Ninth People's Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,National Clinical Research Center of Stomatology, Shanghai 200011, China.,Oral Bioengineering and Regenerative Medicine Lab, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai 200011, China
| | - Seyed Mohammad Mirkhalaf Valashani
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, Sydney, NSW 2006, Australia.,ARC Training Centre for Innovative BioEngineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Paul Rollet
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, Sydney, NSW 2006, Australia.,ARC Training Centre for Innovative BioEngineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Liting Jiang
- Department of Prosthodontics, Shanghai Ninth People's Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,National Clinical Research Center of Stomatology, Shanghai 200011, China.,Oral Bioengineering and Regenerative Medicine Lab, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai 200011, China
| | - Yogambha Ramaswamy
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, Sydney, NSW 2006, Australia.,ARC Training Centre for Innovative BioEngineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Colin R Dunstan
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, Sydney, NSW 2006, Australia.,ARC Training Centre for Innovative BioEngineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - XinQuan Jiang
- Department of Prosthodontics, Shanghai Ninth People's Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,National Clinical Research Center of Stomatology, Shanghai 200011, China.,Oral Bioengineering and Regenerative Medicine Lab, Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology, Shanghai 200011, China
| | - Hala Zreiqat
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical Engineering, The University of Sydney, Sydney, NSW 2006, Australia.,ARC Training Centre for Innovative BioEngineering, The University of Sydney, Sydney, NSW 2006, Australia
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9
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Lu Z, Chiu J, Lee LR, Schindeler A, Jackson M, Ramaswamy Y, Dunstan CR, Hogg PJ, Zreiqat H. Reprogramming of human fibroblasts into osteoblasts by insulin-like growth factor-binding protein 7. Stem Cells Transl Med 2020; 9:403-415. [PMID: 31904196 PMCID: PMC7031646 DOI: 10.1002/sctm.19-0281] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 11/16/2019] [Indexed: 12/22/2022] Open
Abstract
The induced pluripotent stem cell (iPSC) is a promising cell source for tissue regeneration. However, the therapeutic value of iPSC technology is limited due to the complexity of induction protocols and potential risks of teratoma formation. A trans-differentiation approach employing natural factors may allow better control over reprogramming and improved safety. We report here a novel approach to drive trans-differentiation of human fibroblasts into functional osteoblasts using insulin-like growth factor binding protein 7 (IGFBP7). We initially determined that media conditioned by human osteoblasts can induce reprogramming of human fibroblasts to functional osteoblasts. Proteomic analysis identified IGFBP7 as being significantly elevated in media conditioned with osteoblasts compared with those with fibroblasts. Recombinant IGFBP7 induced a phenotypic switch from fibroblasts to osteoblasts. The switch was associated with senescence and dependent on autocrine IL-6 signaling. Our study supports a novel strategy for regenerating bone by using IGFBP7 to trans-differentiate fibroblasts to osteoblasts.
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Affiliation(s)
- ZuFu Lu
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical EngineeringThe University of SydneyCamperdownNew South WalesAustralia
- ARC Training Centre for Innovative BioEngineeringThe University of SydneyCamperdownNew South WalesAustralia
| | - Joyce Chiu
- The Centenary InstituteNHMRC Clinical Trial Centre, The University of SydneyCamperdownNew South WalesAustralia
| | - Lucinda R. Lee
- Bioengineering & Molecular MedicineThe Children's Hospital at WestmeadWestmeadNew South WalesAustralia
- Discipline of Child and Adolescent MedicineThe University of SydneyCamperdownNew South WalesAustralia
| | - Aaron Schindeler
- Bioengineering & Molecular MedicineThe Children's Hospital at WestmeadWestmeadNew South WalesAustralia
- Discipline of Child and Adolescent MedicineThe University of SydneyCamperdownNew South WalesAustralia
| | - Miriam Jackson
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical EngineeringThe University of SydneyCamperdownNew South WalesAustralia
| | - Yogambha Ramaswamy
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical EngineeringThe University of SydneyCamperdownNew South WalesAustralia
- ARC Training Centre for Innovative BioEngineeringThe University of SydneyCamperdownNew South WalesAustralia
| | - Colin R. Dunstan
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical EngineeringThe University of SydneyCamperdownNew South WalesAustralia
- ARC Training Centre for Innovative BioEngineeringThe University of SydneyCamperdownNew South WalesAustralia
| | - Philip J. Hogg
- The Centenary InstituteNHMRC Clinical Trial Centre, The University of SydneyCamperdownNew South WalesAustralia
| | - Hala Zreiqat
- Tissue Engineering & Biomaterials Research Unit, School of Biomedical EngineeringThe University of SydneyCamperdownNew South WalesAustralia
- ARC Training Centre for Innovative BioEngineeringThe University of SydneyCamperdownNew South WalesAustralia
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10
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Li JJ, Dunstan CR, Entezari A, Li Q, Steck R, Saifzadeh S, Sadeghpour A, Field JR, Akey A, Vielreicher M, Friedrich O, Roohani-Esfahani SI, Zreiqat H. A Novel Bone Substitute with High Bioactivity, Strength, and Porosity for Repairing Large and Load-Bearing Bone Defects. Adv Healthc Mater 2019; 8:e1900641. [PMID: 31310457 DOI: 10.1002/adhm.201900641] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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11
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Li JJ, Dunstan CR, Entezari A, Li Q, Steck R, Saifzadeh S, Sadeghpour A, Field JR, Akey A, Vielreicher M, Friedrich O, Roohani‐Esfahani S, Zreiqat H. Bone Regeneration: A Novel Bone Substitute with High Bioactivity, Strength, and Porosity for Repairing Large and Load‐Bearing Bone Defects (Adv. Healthcare Mater. 8/2019). Adv Healthc Mater 2019. [DOI: 10.1002/adhm.201970031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jiao Jiao Li
- Biomaterials and Tissue Engineering Research UnitSchool of Aerospace, Mechanical and Mechatronic EngineeringUniversity of Sydney Sydney NSW 2006 Australia
- Raymond Purves Bone and Joint Research LaboratoriesInstitute of Bone and Joint ResearchKolling InstituteNorthern Sydney Local Health DistrictFaculty of Medicine and HealthUniversity of Sydney St Leonards NSW 2065 Australia
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
| | - Colin R. Dunstan
- Biomaterials and Tissue Engineering Research UnitSchool of Aerospace, Mechanical and Mechatronic EngineeringUniversity of Sydney Sydney NSW 2006 Australia
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
| | - Ali Entezari
- School of Aerospace, Mechanical and Mechatronic EngineeringUniversity of Sydney Sydney NSW 2006 Australia
| | - Qing Li
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
- School of Aerospace, Mechanical and Mechatronic EngineeringUniversity of Sydney Sydney NSW 2006 Australia
| | - Roland Steck
- Medical Engineering Research Facility (MERF)Institute of Health and Biomedical Innovation (IHBI)Queensland University of Technology Prince Charles Hospital Campus Brisbane QLD 4000 Australia
| | - Siamak Saifzadeh
- Medical Engineering Research Facility (MERF)Institute of Health and Biomedical Innovation (IHBI)Queensland University of Technology Prince Charles Hospital Campus Brisbane QLD 4000 Australia
| | - Ameneh Sadeghpour
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
- Allegra Orthopaedics Limited Sydney NSW 2000 Australia
| | - John R. Field
- Centre for Orthopaedic Trauma and ResearchUniversity of Adelaide Adelaide SA 5000 Australia
| | - Austin Akey
- Center for Nanoscale SystemsHarvard University Cambridge MA 02138 USA
| | - Martin Vielreicher
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich Alexander University of Erlangen‐Nürnberg Erlangen 91052 Germany
| | - Oliver Friedrich
- Institute of Medical BiotechnologyDepartment of Chemical and Biological EngineeringFriedrich Alexander University of Erlangen‐Nürnberg Erlangen 91052 Germany
| | | | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research UnitSchool of Aerospace, Mechanical and Mechatronic EngineeringUniversity of Sydney Sydney NSW 2006 Australia
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
- Radcliffe Institute for Advanced StudyHarvard University Cambridge MA 02138 USA
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12
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Li JJ, Dunstan CR, Entezari A, Li Q, Steck R, Saifzadeh S, Sadeghpour A, Field JR, Akey A, Vielreicher M, Friedrich O, Roohani‐Esfahani S, Zreiqat H. A Novel Bone Substitute with High Bioactivity, Strength, and Porosity for Repairing Large and Load-Bearing Bone Defects. Adv Healthc Mater 2019; 8:e1801298. [PMID: 30773833 DOI: 10.1002/adhm.201801298] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Revised: 01/18/2019] [Indexed: 12/18/2022]
Abstract
Achieving adequate healing in large or load-bearing bone defects is highly challenging even with surgical intervention. The clinical standard of repairing bone defects using autografts or allografts has many drawbacks. A bioactive ceramic scaffold, strontium-hardystonite-gahnite or "Sr-HT-Gahnite" (a multi-component, calcium silicate-based ceramic) is developed, which when 3D-printed combines high strength with outstanding bone regeneration ability. In this study, the performance of purely synthetic, 3D-printed Sr-HT-Gahnite scaffolds is assessed in repairing large and load-bearing bone defects. The scaffolds are implanted into critical-sized segmental defects in sheep tibia for 3 and 12 months, with bone autografts used for comparison. The scaffolds induce substantial bone formation and defect bridging after 12 months, as indicated by X-ray, micro-computed tomography, and histological and biomechanical analyses. Detailed analysis of the bone-scaffold interface using focused ion beam scanning electron microscopy and multiphoton microscopy shows scaffold degradation and maturation of the newly formed bone. In silico modeling of strain energy distribution in the scaffolds reveal the importance of surgical fixation and mechanical loading on long-term bone regeneration. The clinical application of 3D-printed Sr-HT-Gahnite scaffolds as a synthetic bone substitute can potentially improve the repair of challenging bone defects and overcome the limitations of bone graft transplantation.
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Affiliation(s)
- Jiao Jiao Li
- Biomaterials and Tissue Engineering Research Unit School of Aerospace, Mechanical and Mechatronic Engineering University of Sydney Sydney NSW 2006 Australia
- Raymond Purves Bone and Joint Research Laboratories Institute of Bone and Joint Research Kolling Institute Northern Sydney Local Health District Faculty of Medicine and Health University of Sydney St Leonards NSW 2065 Australia
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
| | - Colin R. Dunstan
- Biomaterials and Tissue Engineering Research Unit School of Aerospace, Mechanical and Mechatronic Engineering University of Sydney Sydney NSW 2006 Australia
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
| | - Ali Entezari
- School of Aerospace, Mechanical and Mechatronic Engineering University of Sydney Sydney NSW 2006 Australia
| | - Qing Li
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
- School of Aerospace, Mechanical and Mechatronic Engineering University of Sydney Sydney NSW 2006 Australia
| | - Roland Steck
- Medical Engineering Research Facility (MERF) Institute of Health and Biomedical Innovation (IHBI) Queensland University of Technology Prince Charles Hospital Campus Brisbane QLD 4000 Australia
| | - Siamak Saifzadeh
- Medical Engineering Research Facility (MERF) Institute of Health and Biomedical Innovation (IHBI) Queensland University of Technology Prince Charles Hospital Campus Brisbane QLD 4000 Australia
| | - Ameneh Sadeghpour
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
- Allegra Orthopaedics Limited Sydney NSW 2000 Australia
| | - John R. Field
- Centre for Orthopaedic Trauma and Research University of Adelaide Adelaide SA 5000 Australia
| | - Austin Akey
- Center for Nanoscale Systems Harvard University Cambridge MA 02138 USA
| | - Martin Vielreicher
- Institute of Medical Biotechnology Department of Chemical and Biological Engineering Friedrich Alexander University of Erlangen‐Nürnberg Erlangen 91052 Germany
| | - Oliver Friedrich
- Institute of Medical Biotechnology Department of Chemical and Biological Engineering Friedrich Alexander University of Erlangen‐Nürnberg Erlangen 91052 Germany
| | | | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research Unit School of Aerospace, Mechanical and Mechatronic Engineering University of Sydney Sydney NSW 2006 Australia
- Australian Research Council Training Centre for Innovative BioEngineering Sydney NSW 2006 Australia
- Radcliffe Institute for Advanced Study Harvard University Cambridge MA 02138 USA
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13
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Entezari A, Roohani I, Li G, Dunstan CR, Rognon P, Li Q, Jiang X, Zreiqat H. Architectural Design of 3D Printed Scaffolds Controls the Volume and Functionality of Newly Formed Bone. Adv Healthc Mater 2019; 8:e1801353. [PMID: 30536610 DOI: 10.1002/adhm.201801353] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 11/17/2018] [Indexed: 02/01/2023]
Abstract
The successful regeneration of functional bone tissue in critical-size defects remains a significant clinical challenge. To address this challenge, synthetic bone scaffolds are widely developed, but remarkably few are translated to the clinic due to poor performance in vivo. Here, it is demonstrated how architectural design of 3D printed scaffolds can improve in vivo outcomes. Ceramic scaffolds with different pore sizes and permeabilities, but with similar porosity and interconnectivity, are implanted in rabbit calvaria for 12 weeks, and then the explants are harvested for microcomputed tomography evaluation of the volume and functionality of newly formed bone. The results indicate that scaffold pores should be larger than 390 µm with an upper limit of 590 µm to enhance bone formation. It is also demonstrated that a bimodal pore topology-alternating large and small pores-enhances the volume and functionality of new bone substantially. Moreover, bone formation results indicate that stiffness of new bone is highly influenced by the scaffold's permeability in the direction concerned. This study demonstrates that manipulating pore size and permeability in a 3D printed scaffold architecture provides a useful strategy for enhancing bone regeneration outcomes.
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Affiliation(s)
- Ali Entezari
- Australian Research Council Centre in Innovative BioEngineering School of Aerospace Mechanical and Mechatronic Engineering University of Sydney NSW 2006 Australia
- Shanghai‐Sydney Joint Bioengineering and Regenerative Medicine Lab at Shanghai JiaoTong Shanghai 200011 China
| | - Iman Roohani
- School of Chemistry University of New South Wales NSW 2052 Australia
| | - Guanglong Li
- Shanghai‐Sydney Joint Bioengineering and Regenerative Medicine Lab at Shanghai JiaoTong Shanghai 200011 China
- Department of Prosthodontics Oral Bioengineering and Regenerative Medicine Lab Ninth People's Hospital affiliated to Shanghai Jiao Tong University School of Medicine 639 Zhizaoju Road Shanghai 200011 China
| | - Colin R. Dunstan
- Australian Research Council Centre in Innovative BioEngineering School of Aerospace Mechanical and Mechatronic Engineering University of Sydney NSW 2006 Australia
- Shanghai‐Sydney Joint Bioengineering and Regenerative Medicine Lab at Shanghai JiaoTong Shanghai 200011 China
| | - Pierre Rognon
- School of Civil Engineering University of Sydney NSW 2006 Australia
| | - Qing Li
- Australian Research Council Centre in Innovative BioEngineering School of Aerospace Mechanical and Mechatronic Engineering University of Sydney NSW 2006 Australia
- Shanghai‐Sydney Joint Bioengineering and Regenerative Medicine Lab at Shanghai JiaoTong Shanghai 200011 China
| | - Xinquan Jiang
- Shanghai‐Sydney Joint Bioengineering and Regenerative Medicine Lab at Shanghai JiaoTong Shanghai 200011 China
- Department of Prosthodontics Oral Bioengineering and Regenerative Medicine Lab Ninth People's Hospital affiliated to Shanghai Jiao Tong University School of Medicine 639 Zhizaoju Road Shanghai 200011 China
| | - Hala Zreiqat
- Australian Research Council Centre in Innovative BioEngineering School of Aerospace Mechanical and Mechatronic Engineering University of Sydney NSW 2006 Australia
- Shanghai‐Sydney Joint Bioengineering and Regenerative Medicine Lab at Shanghai JiaoTong Shanghai 200011 China
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14
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Li JJ, Akey A, Dunstan CR, Vielreicher M, Friedrich O, Bell DC, Zreiqat H. Effects of Material-Tissue Interactions on Bone Regeneration Outcomes Using Baghdadite Implants in a Large Animal Model. Adv Healthc Mater 2018; 7:e1800218. [PMID: 29877058 DOI: 10.1002/adhm.201800218] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 04/03/2018] [Indexed: 12/13/2022]
Abstract
Extensive bone loss due to trauma or disease leads to impaired healing. Current bone grafts and substitutes have major drawbacks that limit their effectiveness for treating large bone defects. A number of bone substitutes in development are undergoing preclinical testing, but few studies specifically investigate the in vivo material-tissue interactions that provide an important indicator to long-term implant safety and efficacy. This study is the first of its kind to specifically investigate in vivo material-tissue interactions at the bone-implant interface. Baghdadite scaffolds implanted in critical-sized segmental defects in sheep tibia for 26 weeks are analyzed by focused ion beam scanning electron microscopy, multiphoton microscopy, and histology. The scaffolds are seen to induce extensive bone formation that directly abut the implant surfaces with no evidence of chronic inflammation or fibrous capsule formation. Bone remodeling is influenced by slow in vivo degradation around and within the implant, causing portions of the implant to be incorporated into the newly formed bone. These findings have important implications for predicting the long-term effects of baghdadite ceramics in promoting defect healing, and support the translation of baghdadite scaffolds as a new generation of bone graft substitutes with improved properties for the repair of large bone defects.
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Affiliation(s)
- Jiao Jiao Li
- Biomaterials and Tissue Engineering Research Unit, School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, 2006, Australia
- Raymond Purves Bone and Joint Research Laboratories, Institute of Bone and Joint Research, Kolling Institute, Northern Sydney Local Health District, Faculty of Medicine and Health, University of Sydney, St Leonards, NSW, 2065, Australia
| | - Austin Akey
- Center for Nanoscale Systems, Harvard University, Cambridge, MA, 02138, USA
| | - Colin R Dunstan
- Biomaterials and Tissue Engineering Research Unit, School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, 2006, Australia
| | - Martin Vielreicher
- Department of Chemical and Biological Engineering, Institute of Medical Biotechnology, Friedrich Alexander University of Erlangen-Nürnberg, Erlangen, 91052, Germany
| | - Oliver Friedrich
- Department of Chemical and Biological Engineering, Institute of Medical Biotechnology, Friedrich Alexander University of Erlangen-Nürnberg, Erlangen, 91052, Germany
| | - David C Bell
- Center for Nanoscale Systems, Harvard University, Cambridge, MA, 02138, USA
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research Unit, School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, 2006, Australia
- Radcliffe Institute for Advanced Study, Harvard University, Cambridge, MA, 02138, USA
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15
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Trivedi T, Zheng Y, Fournier PGJ, Murthy S, John S, Schillo S, Dunstan CR, Mohammad KS, Zhou H, Seibel MJ, Guise TA. The vitamin D receptor is involved in the regulation of human breast cancer cell growth via a ligand-independent function in cytoplasm. Oncotarget 2018; 8:26687-26701. [PMID: 28460457 PMCID: PMC5432290 DOI: 10.18632/oncotarget.15803] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 02/15/2017] [Indexed: 12/31/2022] Open
Abstract
Vitamin D has pleiotropic effects on multiple tissues, including malignant tumors. Vitamin D inhibits breast cancer growth through activation of the vitamin D receptor (VDR) and via classical nuclear signaling pathways. Here, we demonstrate that the VDR can also function in the absence of its ligand to control behaviour of human breast cancer cells both outside and within the bone microenvironment. Stable shRNA expression was used to knock down VDR expression in MCF-7 cells, generating two VDR knockdown clonal lines. In ligand-free culture, knockdown of VDR in MCF-7 cells significantly reduced proliferation and increased apoptosis, suggesting that the VDR plays a ligand-independent role in cancer cell growth. Implantation of these VDR knockdown cells into the mammary fat pad of nude mice resulted in reduced tumor growth in vivo compared with controls. In the intra-tibial xenograft model, VDR knockdown greatly reduced the ability of the cells to form tumors in the bone microenvironment. The in vitro growth of VDR knockdown cells was rescued by the expression of a mutant form of VDR which is unable to translocate to the nucleus and hence accumulates in the cytoplasm. Thus, our data indicate that in the absence of ligand, the VDR promotes breast cancer growth both in vitro and in vivo and that cytoplasmic accumulation of VDR is sufficient to produce this effect in vitro. This new mechanism of VDR action in breast cancer cells contrasts the known anti-proliferative nuclear actions of the VDR-vitamin D ligand complex.
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Affiliation(s)
- Trupti Trivedi
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, Australia.,Division of Endocrinology, Department of Medicine, Indiana University-Purdue University at Indianapolis, Indianapolis, Indiana, USA
| | - Yu Zheng
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, Australia
| | - Pierrick G J Fournier
- Division of Endocrinology, Department of Medicine, Indiana University-Purdue University at Indianapolis, Indianapolis, Indiana, USA.,Biomedical Innovation Department, Scientific Research and High Education Center from Ensenada (CICESE), Ensenada, Baja California, Mexico
| | - Sreemala Murthy
- Division of Endocrinology, Department of Medicine, Indiana University-Purdue University at Indianapolis, Indianapolis, Indiana, USA
| | - Sutha John
- Division of Endocrinology, Department of Medicine, Indiana University-Purdue University at Indianapolis, Indianapolis, Indiana, USA
| | - Suzanne Schillo
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, Australia
| | - Colin R Dunstan
- Department of Biomedical Engineering, University of Sydney, Sydney, Australia
| | - Khalid S Mohammad
- Division of Endocrinology, Department of Medicine, Indiana University-Purdue University at Indianapolis, Indianapolis, Indiana, USA
| | - Hong Zhou
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, Australia
| | - Markus J Seibel
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, Australia.,Department of Endocrinology and Metabolism, Concord Hospital, Concord, Sydney, Australia
| | - Theresa A Guise
- Division of Endocrinology, Department of Medicine, Indiana University-Purdue University at Indianapolis, Indianapolis, Indiana, USA
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16
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Rawling T, Choucair H, Koolaji N, Bourget K, Allison SE, Chen YJ, Dunstan CR, Murray M. A Novel Arylurea Fatty Acid That Targets the Mitochondrion and Depletes Cardiolipin To Promote Killing of Breast Cancer Cells. J Med Chem 2017; 60:8661-8666. [DOI: 10.1021/acs.jmedchem.7b00701] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tristan Rawling
- School
of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
| | - Hassan Choucair
- Discipline
of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Nooshin Koolaji
- Discipline
of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Kirsi Bourget
- Discipline
of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Sarah E. Allison
- Discipline
of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Yong-Juan Chen
- School
of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Colin R. Dunstan
- School
of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Michael Murray
- Discipline
of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, Sydney, New South Wales 2006, Australia
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17
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Allison SE, Chen Y, Petrovic N, Zimmermann S, Moosmann B, Jansch M, Cui PH, Dunstan CR, Mackenzie PI, Murray M. Activation of the pro-migratory bone morphogenetic protein receptor 1B gene in human MDA-MB-468 triple-negative breast cancer cells that over-express CYP2J2. Int J Biochem Cell Biol 2016; 80:173-178. [PMID: 27720933 DOI: 10.1016/j.biocel.2016.10.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 09/16/2016] [Accepted: 10/04/2016] [Indexed: 01/08/2023]
Abstract
Secondary metastases are the leading cause of mortality in patients with breast cancer. Cytochrome P450 (CYP) 2J2 (CYP2J2) is upregulated in many human tumors and generates epoxyeicosanoids from arachidonic acid that promote tumorigenesis and metastasis, but at present there is little information on the genes that mediate these actions. In this study MDA-MB-468 breast cancer cells were stably transfected with CYP2J2 (MDA-2J2 cells) and Affymetrix microarray profiling was undertaken. We identified 182 genes that were differentially expressed in MDA-2J2 cells relative to control (MDA-CTL) cells (log[fold of control] ≥2). From gene ontology pathway analysis bone morphogenetic protein (BMP) receptor 1B (BMPR1B) emerged as an important upregulated gene in MDA-2J2 cells. Addition of the BMPR1B ligand BMP2 stimulated the migration of MDA-2J2 cells, but not MDA-CTL cells, from 3D-matrigel droplets. Migration of MDA-2J2 cells was prevented by the BMPR antagonist dorsomorphin. These findings indicate that over-expression of CYP2J2 in MDA-MB-468-derived breast cancer cells activates BMPR1B expression that may contribute to increased migration. Targeting BMPR1B may be a novel approach to inhibit the metastatic activity of breast cancers that contain high levels of CYP2J2.
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Affiliation(s)
- Sarah E Allison
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Yongjuan Chen
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, NSW 2006, Australia
| | - Nenad Petrovic
- School of Pharmacy and Medical Sciences, University of South Australia, GPO Box 2471, Adelaide, SA 5001, Australia
| | - Stefanie Zimmermann
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Bjoern Moosmann
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Mirko Jansch
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Pei H Cui
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia
| | - Colin R Dunstan
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, NSW 2006, Australia
| | - Peter I Mackenzie
- Clinical Pharmacology, Flinders University of South Australia, Bedford Park, SA 5042, Australia
| | - Michael Murray
- Pharmacogenomics and Drug Development Group, Discipline of Pharmacology, School of Medical Sciences, Sydney Medical School, University of Sydney, NSW 2006, Australia.
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18
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Li JJ, Roohani-Esfahani SI, Dunstan CR, Quach T, Steck R, Saifzadeh S, Pivonka P, Zreiqat H. Efficacy of novel synthetic bone substitutes in the reconstruction of large segmental bone defects in sheep tibiae. ACTA ACUST UNITED AC 2016; 11:015016. [PMID: 26894676 DOI: 10.1088/1748-6041/11/1/015016] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The treatment of large bone defects, particularly those with segmental bone loss, remains a significant clinical challenge as current approaches involving surgery or bone grafting often do not yield satisfactory long-term outcomes. This study reports the evaluation of novel ceramic scaffolds applied as bone graft substitutes in a clinically relevant in vivo model. Baghdadite scaffolds, unmodified or modified with a polycaprolactone coating containing bioactive glass nanoparticles, were implanted into critical-sized segmental bone defects in sheep tibiae for 26 weeks. Radiographic, biomechanical, μ-CT and histological analyses showed that both unmodified and modified baghdadite scaffolds were able to withstand physiological loads at the defect site, and induced substantial bone formation in the absence of supplementation with cells or growth factors. Notably, all samples showed significant bridging of the critical-sized defect (average 80%) with evidence of bone infiltration and remodelling within the scaffold implant. The unmodified and modified baghdadite scaffolds achieved similar outcomes of defect repair, although the latter may have an initial mechanical advantage due to the nanocomposite coating. The baghdadite scaffolds evaluated in this study hold potential for use as purely synthetic bone graft substitutes in the treatment of large bone defects while circumventing the drawbacks of autografts and allografts.
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Affiliation(s)
- Jiao Jiao Li
- Biomaterials and Tissue Engineering Research Unit, School of AMME, University of Sydney, Sydney, NSW 2006, Australia. These authors contributed equally
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19
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Sirisa-Ard A, Woodroffe Michael SN, Ahmed K, Dunstan CR, Pearce SG, Bilgin AA, Dalci O, Darendeliler MA. Histomorphological and torque removal comparison of 6 mm orthodontic miniscrews with and without surface treatment in New Zealand rabbits. Eur J Orthod 2015; 37:578-83. [PMID: 25608834 DOI: 10.1093/ejo/cju077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AIM The purpose of this study was to assess the difference of removal torque values (RTV) and the bone-to-implant contact (BIC) between the sand-blasted, large grit, and acid-etched (SLA) surface-treated and the machined surface (MA) miniscrews. MATERIAL AND METHODS Miniscrews used in this study were 6mm long with a diameter of 1.5mm. A total of 23 SLA miniscrews and 24 MA miniscrews were placed into the distal femoral condyle of 24 New Zealand rabbits. Removal torque test and the BIC was histologically evaluated at 0 and 8 weeks. RESULTS There was no statistical difference between the RTV in the MA group versus the SLA group at both 0 and 8 weeks. Comparing 0-8 weeks, there was no significant difference in RTV of the SLA group (P = 0.48), however the change in the MA group was statistically significant (P = 0.006). Histological observation showed a significant decrease in BIC comparing 0 and 8 weeks for the MA group. The BIC ratio at 8 weeks was statistically significantly higher in the SLA group compared to the MA group. CONCLUSION SLA surface preparation does not increase the RTV of miniscrews. Further investigations under loading and a large sample size are required.
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Affiliation(s)
| | | | - Kamal Ahmed
- *Discipline of Orthodontics, Faculty of Dentistry and
| | - Colin R Dunstan
- **Department of Biomedical Engineering, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales
| | - Simon G Pearce
- ***Surgical Research Australia Pty Ltd, North Adelaide, South Australia, and
| | - Ayse Aysin Bilgin
- ****Department of Statistics, Faculty of Science, Macquarie University, Sydney, New South Wales, Australia
| | - Oyku Dalci
- *Discipline of Orthodontics, Faculty of Dentistry and
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20
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Chen Y, Roohani-Esfahani SI, Lu Z, Zreiqat H, Dunstan CR. Zirconium ions up-regulate the BMP/SMAD signaling pathway and promote the proliferation and differentiation of human osteoblasts. PLoS One 2015; 10:e0113426. [PMID: 25602473 PMCID: PMC4300214 DOI: 10.1371/journal.pone.0113426] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 10/27/2014] [Indexed: 11/19/2022] Open
Abstract
Zirconium (Zr) is an element commonly used in dental and orthopedic implants either as zirconia (ZrO2) or in metal alloys. It can also be incorporated into calcium silicate-based ceramics. However, the effects of in vitro culture of human osteoblasts (HOBs) with soluble ionic forms of Zr have not been determined. In this study, primary culture of human osteoblasts was conducted in the presence of medium containing either ZrCl4 or Zirconium (IV) oxynitrate (ZrO(NO3)2) at concentrations of 0, 5, 50 and 500 µM, and osteoblast proliferation, differentiation and calcium deposition were assessed. Incubation of human osteoblast cultures with Zr ions increased the proliferation of human osteoblasts and also gene expression of genetic markers of osteoblast differentiation. In 21 and 28 day cultures, Zr ions at concentrations of 50 and 500 µM increased the deposition of calcium phosphate. In addition, the gene expression of BMP2 and BMP receptors was increased in response to culture with Zr ions and this was associated with increased phosphorylation of SMAD1/5. Moreover, Noggin suppressed osteogenic gene expression in HOBs co-treated with Zr ions. In conclusion, Zr ions appear able to induce both the proliferation and the differentiation of primary human osteoblasts. This is associated with up-regulation of BMP2 expression and activation of BMP signaling suggesting this action is, at least in part, mediated by BMP signaling.
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Affiliation(s)
- Yongjuan Chen
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Seyed-Iman Roohani-Esfahani
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - ZuFu Lu
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Colin R. Dunstan
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, New South Wales 2006, Australia
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21
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Zheng Y, Chow SO, Boernert K, Basel D, Mikuscheva A, Kim S, Fong-Yee C, Trivedi T, Buttgereit F, Sutherland RL, Dunstan CR, Zhou H, Seibel MJ. Direct crosstalk between cancer and osteoblast lineage cells fuels metastatic growth in bone via auto-amplification of IL-6 and RANKL signaling pathways. J Bone Miner Res 2014; 29:1938-49. [PMID: 24676805 DOI: 10.1002/jbmr.2231] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 03/13/2014] [Accepted: 03/17/2014] [Indexed: 01/09/2023]
Abstract
The bone microenvironment and its modification by cancer and host cell interactions is a key driver of skeletal metastatic growth. Interleukin-6 (IL-6) stimulates receptor activator of NF-κB ligand (RANKL) expression in bone cells, and serum IL-6 levels are associated with poor clinical outcomes in cancer patients. We investigated the effects of RANKL on cancer cells and the role of tumor-derived IL-6 within the bone microenvironment. Using human breast cancer cell lines to induce tumors in the bone of immune-deficient mice, we first determined whether RANKL released by cells of the osteoblast lineage directly promotes IL-6 expression by cancer cells in vitro and in vivo. We then disrupted of IL-6 signaling in vivo either via knockdown of IL-6 in tumor cells or through treatment with specific anti-human or anti-mouse IL-6 receptor antibodies to investigate the tumor effect. Finally, we tested the effect of RANK knockdown in cancer cells on cancer growth. We demonstrate that osteoblast lineage-derived RANKL upregulates secretion of IL-6 by breast cancers in vivo and in vitro. IL-6, in turn, induces expression of RANK by cancer cells, which sensitizes the tumor to RANKL and significantly enhances cancer IL-6 release. Disruption in vivo of this auto-amplifying crosstalk by knockdown of IL-6 or RANK in cancer cells, or via treatment with anti-IL-6 receptor antibodies, significantly reduces tumor growth in bone but not in soft tissues. RANKL and IL-6 mediate direct paracrine-autocrine signaling between cells of the osteoblast lineage and cancer cells, significantly enhancing the growth of metastatic breast cancers within bone.
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Affiliation(s)
- Yu Zheng
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, Australia; The Kinghorn Cancer Centre and Cancer Research Program, Garvan Institute of Medical Research, Sydney, Australia
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22
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Lu Z, Wang G, Roohani-Esfahani I, Dunstan CR, Zreiqat H. Baghdadite Ceramics Modulate the Cross Talk Between Human Adipose Stem Cells and Osteoblasts for Bone Regeneration. Tissue Eng Part A 2014; 20:992-1002. [DOI: 10.1089/ten.tea.2013.0470] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- ZuFu Lu
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
| | - GuoCheng Wang
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
| | - Iman Roohani-Esfahani
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
| | - Colin R. Dunstan
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
| | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
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23
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Scheiner S, Pivonka P, Smith DW, Dunstan CR, Hellmich C. Mathematical modeling of postmenopausal osteoporosis and its treatment by the anti-catabolic drug denosumab. Int J Numer Method Biomed Eng 2014; 30:1-27. [PMID: 24039120 PMCID: PMC4291103 DOI: 10.1002/cnm.2584] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Revised: 07/03/2013] [Accepted: 07/09/2013] [Indexed: 06/02/2023]
Abstract
Denosumab, a fully human monoclonal antibody, has been approved for the treatment of postmenopausal osteoporosis. The therapeutic effect of denosumab rests on its ability to inhibit osteoclast differentiation. Here, we present a computational approach on the basis of coupling a pharmacokinetics model of denosumab with a pharmacodynamics model for quantifying the effect of denosumab on bone remodeling. The pharmacodynamics model comprises an integrated systems biology-continuum micromechanics approach, including a bone cell population model, considering the governing biochemical factors of bone remodeling (including the action of denosumab), and a multiscale micromechanics-based bone mechanics model, for implementing the mechanobiology of bone remodeling in our model. Numerical studies of postmenopausal osteoporosis show that denosumab suppresses osteoclast differentiation, thus strongly curtailing bone resorption. Simulation results also suggest that denosumab may trigger a short-term bone volume gain, which is, however, followed by constant or decreasing bone volume. This evolution is accompanied by a dramatic decrease of the bone turnover rate by more than one order of magnitude. The latter proposes dominant occurrence of secondary mineralization (which is not anymore impeded through cellular activity), leading to higher mineral concentration per bone volume. This explains the overall higher bone mineral density observed in denosumab-related clinical studies.
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Affiliation(s)
- S Scheiner
- Institute for Mechanics of Materials and Structures, Vienna University of Technology, Austria
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24
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Roohani-Esfahani SI, Dunstan CR, Li JJ, Lu Z, Davies B, Pearce S, Field J, Williams R, Zreiqat H. Unique microstructural design of ceramic scaffolds for bone regeneration under load. Acta Biomater 2013; 9:7014-24. [PMID: 23467040 DOI: 10.1016/j.actbio.2013.02.039] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 01/23/2013] [Accepted: 02/22/2013] [Indexed: 11/28/2022]
Abstract
During the past two decades, research on ceramic scaffolds for bone regeneration has progressed rapidly; however, currently available porous scaffolds remain unsuitable for load-bearing applications. The key to success is to apply microstructural design strategies to develop ceramic scaffolds with mechanical properties approaching those of bone. Here we report on the development of a unique microstructurally designed ceramic scaffold, strontium-hardystonite-gahnite (Sr-HT-gahnite), with 85% porosity, 500μm pore size, a competitive compressive strength of 4.1±0.3MPa and a compressive modulus of 170±20MPa. The in vitro biocompatibility of the scaffolds was studied using primary human bone-derived cells. The ability of Sr-HT-gahnite scaffolds to repair critical-sized bone defects was also investigated in a rabbit radius under normal load, with β-tricalcium phosphate/hydroxyapatite scaffolds used in the control group. Studies with primary human osteoblast cultures confirmed the bioactivity of these scaffolds, and regeneration of rabbit radial critical defects demonstrated that this material induces new bone defect bridging, with clear evidence of regeneration of original radial architecture and bone marrow environment.
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Affiliation(s)
- S I Roohani-Esfahani
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney 2006, Australia
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25
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Lu Z, Wang G, Dunstan CR, Chen Y, Yenn-Ru Lu W, Davies B, Zreiqat H. Activation and promotion of adipose stem cells by tumour necrosis factor-alpha preconditioning for bone regeneration. J Cell Physiol 2013; 228:1737-44. [DOI: 10.1002/jcp.24330] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Accepted: 01/16/2013] [Indexed: 12/11/2022]
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26
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Zheng Y, Zhou H, Dunstan CR, Sutherland RL, Seibel MJ. The role of the bone microenvironment in skeletal metastasis. J Bone Oncol 2012; 2:47-57. [PMID: 26909265 PMCID: PMC4723345 DOI: 10.1016/j.jbo.2012.11.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 11/22/2012] [Accepted: 11/22/2012] [Indexed: 01/27/2023] Open
Abstract
The bone microenvironment provides a fertile soil for cancer cells. It is therefore not surprising that the skeleton is a frequent site of cancer metastasis. It is believed that reciprocal interactions between tumour and bone cells, known as the “vicious cycle of bone metastasis” support the establishment and orchestrate the expansion of malignant cancers in bone. While the full range of molecular mechanisms of cancer metastasis to bone remain to be elucidated, recent research has deepened our understanding of the cell-mediated processes that may be involved in cancer cell survival and growth in bone. This review aims to address the importance of the bone microenvironment in skeletal cancer metastasis and discusses potential therapeutic implications of novel insights.
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Affiliation(s)
- Yu Zheng
- Bone Research Program, ANZAC Research Institute, University of Sydney, NSW 2139, Australia; The Kinghorn Cancer Centre and Cancer Research Program, Garvan Institute of Medical Research, Sydney, NSW 2010, Australia
| | - Hong Zhou
- Bone Research Program, ANZAC Research Institute, University of Sydney, NSW 2139, Australia
| | - Colin R Dunstan
- Bone Research Program, ANZAC Research Institute, University of Sydney, NSW 2139, Australia; Department of Biomedical Engineering, University of Sydney, NSW 2006, Australia
| | - Robert L Sutherland
- The Kinghorn Cancer Centre and Cancer Research Program, Garvan Institute of Medical Research, Sydney, NSW 2010, Australia
| | - Markus J Seibel
- Bone Research Program, ANZAC Research Institute, University of Sydney, NSW 2139, Australia; Department of Endocrinology & Metabolism, Concord Hospital, Concord, Sydney, NSW 2139, Australia
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27
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Abstract
Bone fracture healing is a complex physiological process commonly described by a four-phase model consisting of an inflammatory phase, two repair phases with soft callus formation followed by hard callus formation, and a remodeling phase, or more recently by an anabolic/catabolic model. Data from humans and animal models have demonstrated crucial environmental conditions for optimal fracture healing, including the mechanical environment, blood supply and availability of mesenchymal stem cells. Fracture healing spans multiple length and time scales, making it difficult to know precisely which factors and/or phases to manipulate in order to obtain optimal fracture-repair outcomes. Deformations resulting from physiological loading or fracture fixation at the organ scale are sensed at the cellular scale by cells inside the fracture callus. These deformations together with autocrine and paracrine signals determine cellular differentiation, proliferation and migration. The local repair activities lead to new bone formation and stabilization of the fracture. Although experimental data are available at different spatial and temporal scales, it is not clear how these data can be linked to provide a holistic view of fracture healing. Mathematical modeling is a powerful tool to quantify conceptual models and to establish the missing links between experimental data obtained at different scales. The objective of this review is to introduce mathematical modeling to readers who are not familiar with this methodology and to demonstrate that once validated, such models can be used for hypothesis testing and to assist in clinical treatment as will be shown for the example of atrophic nonunions.
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Affiliation(s)
- Peter Pivonka
- Faculty of Engineering, Computing and Mathematics, University of Western Australia, WA, Australia
| | - Colin R Dunstan
- Biomedical Engineering, University of Sydney, Sydney, NSW, Australia
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28
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Brennan-Speranza TC, Henneicke H, Gasparini SJ, Blankenstein KI, Heinevetter U, Cogger VC, Svistounov D, Zhang Y, Cooney GJ, Buttgereit F, Dunstan CR, Gundberg C, Zhou H, Seibel MJ. Osteoblasts mediate the adverse effects of glucocorticoids on fuel metabolism. J Clin Invest 2012; 122:4172-89. [PMID: 23093779 DOI: 10.1172/jci63377] [Citation(s) in RCA: 132] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Accepted: 08/23/2012] [Indexed: 12/11/2022] Open
Abstract
Long-term glucocorticoid treatment is associated with numerous adverse outcomes, including weight gain, insulin resistance, and diabetes; however, the pathogenesis of these side effects remains obscure. Glucocorticoids also suppress osteoblast function, including osteocalcin synthesis. Osteocalcin is an osteoblast-specific peptide that is reported to be involved in normal murine fuel metabolism. We now demonstrate that osteoblasts play a pivotal role in the pathogenesis of glucocorticoid-induced dysmetabolism. Osteoblast-targeted disruption of glucocorticoid signaling significantly attenuated the suppression of osteocalcin synthesis and prevented the development of insulin resistance, glucose intolerance, and abnormal weight gain in corticosterone-treated mice. Nearly identical effects were observed in glucocorticoid-treated animals following heterotopic (hepatic) expression of both carboxylated and uncarboxylated osteocalcin through gene therapy, which additionally led to a reduction in hepatic lipid deposition and improved phosphorylation of the insulin receptor. These data suggest that the effects of exogenous high-dose glucocorticoids on insulin target tissues and systemic energy metabolism are mediated, at least in part, through the skeleton.
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29
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Lu Z, Wang G, Dunstan CR, Zreiqat H. Short-Term Exposure to Tumor Necrosis Factor-Alpha Enables Human Osteoblasts to Direct Adipose Tissue-Derived Mesenchymal Stem Cells into Osteogenic Differentiation. Stem Cells Dev 2012; 21:2420-9. [DOI: 10.1089/scd.2011.0589] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- ZuFu Lu
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
| | - Guocheng Wang
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
| | - Colin R. Dunstan
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
| | - Hala Zreiqat
- Biomaterials and Tissue Engineering Research Unit, School of AMME, The University of Sydney, Sydney, Australia
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30
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Wang Y, Pivonka P, Buenzli PR, Smith DW, Dunstan CR. Computational modeling of interactions between multiple myeloma and the bone microenvironment. PLoS One 2011; 6:e27494. [PMID: 22110661 PMCID: PMC3210790 DOI: 10.1371/journal.pone.0027494] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Accepted: 10/18/2011] [Indexed: 01/25/2023] Open
Abstract
Multiple Myeloma (MM) is a B-cell malignancy that is characterized by osteolytic bone lesions. It has been postulated that positive feedback loops in the interactions between MM cells and the bone microenvironment form reinforcing ‘vicious cycles’, resulting in more bone resorption and MM cell population growth in the bone microenvironment. Despite many identified MM-bone interactions, the combined effect of these interactions and their relative importance are unknown. In this paper, we develop a computational model of MM-bone interactions and clarify whether the intercellular signaling mechanisms implemented in this model appropriately drive MM disease progression. This new computational model is based on the previous bone remodeling model of Pivonka et al. [1], and explicitly considers IL-6 and MM-BMSC (bone marrow stromal cell) adhesion related pathways, leading to formation of two positive feedback cycles in this model. The progression of MM disease is simulated numerically, from normal bone physiology to a well established MM disease state. Our simulations are consistent with known behaviors and data reported for both normal bone physiology and for MM disease. The model results suggest that the two positive feedback cycles identified for this model are sufficient to jointly drive the MM disease progression. Furthermore, quantitative analysis performed on the two positive feedback cycles clarifies the relative importance of the two positive feedback cycles, and identifies the dominant processes that govern the behavior of the two positive feedback cycles. Using our proposed quantitative criteria, we identify which of the positive feedback cycles in this model may be considered to be ‘vicious cycles’. Finally, key points at which to block the positive feedback cycles in MM-bone interactions are identified, suggesting potential drug targets.
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Affiliation(s)
- Yan Wang
- Department of Infrastructure Engineering, School of Engineering, University of Melbourne, Melbourne, Victoria, Australia
- * E-mail: (YW); (DWS)
| | - Peter Pivonka
- Faculty of Engineering, Computing and Mathematics, University of Western Australia, Perth, Western Australia, Australia
| | - Pascal R. Buenzli
- Faculty of Engineering, Computing and Mathematics, University of Western Australia, Perth, Western Australia, Australia
| | - David W. Smith
- Faculty of Engineering, Computing and Mathematics, University of Western Australia, Perth, Western Australia, Australia
- * E-mail: (YW); (DWS)
| | - Colin R. Dunstan
- Department of Biomedical Engineering, School of Engineering, University of Sydney, Sydney, New South Wales, Australia
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31
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Henneicke H, Herrmann M, Kalak R, Brennan-Speranza TC, Heinevetter U, Bertollo N, Day RE, Huscher D, Buttgereit F, Dunstan CR, Seibel MJ, Zhou H. Corticosterone selectively targets endo-cortical surfaces by an osteoblast-dependent mechanism. Bone 2011; 49:733-42. [PMID: 21722764 DOI: 10.1016/j.bone.2011.06.013] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 06/01/2011] [Accepted: 06/13/2011] [Indexed: 11/29/2022]
Abstract
BACKGROUND The pathogenesis of glucocorticoid-induced osteoporosis remains ill defined. In this study, we examined the role of the osteoblast in mediating the effects of exogenous glucocorticoids on cortical and trabecular bone, employing the Col2.3-11βHSD2 transgenic mouse model of osteoblast-targeted disruption of glucocorticoid signalling. METHODS Eight week-old male transgenic (tg) and wild-type (WT) mice (n=20-23/group) were treated with either 1.5 mg corticosterone (CS) or placebo for 4 weeks. Serum tartrate-resistant acid phosphatase 5b (TRAP5b) and osteocalcin (OCN) were measured throughout the study. Tibiae and lumbar vertebrae were analysed by micro-CT and histomorphometry at endpoint. RESULTS CS suppressed serum OCN levels in WT and tg mice, although they remained higher in tg animals at all time points (p<0.05). Serum TRAP5b levels increased in WT mice only. The effect of CS on cortical bone differed by site: At the endosteal surface, exposure to CS significantly increased bone resorption and reduced bone formation, resulting in a larger bone marrow cavity cross-sectional area (p<0.01). In contrast, at the pericortical surface bone resorption was significantly decreased accompanied with a significant increase in pericortical cross-sectional area (p<0.05) while bone formation remained unaffected. Vertebral cortical thickness and area were reduced in CS treatment mice. Tg mice were partially protected from the effects of exogenous CS, both on a cellular and structural level. At the CS doses used in this study, trabecular bone remained largely unaffected. CONCLUSION Endocortical osteoblasts appear to be particularly sensitive to the detrimental actions of exogenous glucocorticoids. The increase in tibial pericortical cross-sectional area and the according changes in pericortical circumference suggest an anabolic bone response to GC treatment at this site. The protection of tg mice from these effects indicates that both catabolic and anabolic action of glucocorticoids are, at least in part, mediated by osteoblasts.
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Affiliation(s)
- Holger Henneicke
- Bone Research Program, ANZAC Research Institute, The University of Sydney, Sydney, Australia
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Zheng Y, Zhou H, Ooi LL, Snir AD, Dunstan CR, Seibel MJ. Vitamin D deficiency promotes prostate cancer growth in bone. Prostate 2011; 71:1012-21. [PMID: 21541977 DOI: 10.1002/pros.21316] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2010] [Accepted: 11/08/2010] [Indexed: 11/11/2022]
Abstract
BACKGROUND Vitamin D is considered as an important determinant of bone turnover as well as cancer growth. Using a murine model of bone metastasis, we investigated the effect of vitamin D deficiency on prostate cancer cell growth in bone. METHODS Three-week-old male nude mice were fed either normal chow (control) or a diet deficient in vitamin D. The latter diet resulted in severe hypovitaminosis D within 6 weeks. At this point of time, 5 × 10(4) cells of the prostate cancer cell line, PC-3, were injected either into the bone marrow (tibia) or subcutaneously into soft tissues. Osteoprotegerin (OPG) was co-administered in subgroups of mice to suppress bone remodeling. Osteolytic lesions were monitored by serial X-ray, while soft tissue tumor growth was measured by caliper. All tissues were analyzed by micro-CT and histology at endpoint. RESULTS Bone turnover was significantly accelerated in vitamin D deficient compared to vitamin D sufficient mice from week 6 onwards. Intra-tibially implanted PC-3 cells resulted in mixed osteolytic and osteosclerotic lesion. At endpoint, osteolytic and osteosclerotic lesion areas, total tumor area, and tumor mitotic activity were all significantly increased in vitamin D deficient mice compared to controls. Regardless of diet, OPG reduced bone turnover, total tumor, and osteosclerotic area as well as tumor mitotic activity, while promoting cell apoptosis. In contrast, vitamin D deficiency did not alter tumor growth in soft tissues. CONCLUSION Vitamin D deficiency stimulates prostate cancer growth in bone through modulating the bone microenvironment.
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Affiliation(s)
- Yu Zheng
- Bone Research Program, ANZAC Research Institute, University of Sydney, Concord, Sydney, NSW, Australia
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Stalgis‐Bilinski KL, Boyages J, Salisbury EL, Dunstan CR, Henderson SI, Talbot PL. Burning daylight: balancing vitamin D requirements with sensible sun exposure. Med J Aust 2011; 194:345-8. [DOI: 10.5694/j.1326-5377.2011.tb03003.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Accepted: 01/24/2011] [Indexed: 11/17/2022]
Affiliation(s)
| | - John Boyages
- Westmead Breast Cancer Institute, University of Sydney, Sydney, NSW
| | | | - Colin R Dunstan
- Biomedical Engineering, School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW
| | - Stuart I Henderson
- Non‐ionising Radiation Branch, Australian Radiation Protection and Nuclear Safety Agency, Yallambie, VIC
| | - Peter L Talbot
- Department of Dietetics and Nutrition, Westmead Hospital, Sydney, NSW
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Ooi LL, Zheng Y, Stalgis-Bilinski K, Dunstan CR. The bone remodeling environment is a factor in breast cancer bone metastasis. Bone 2011; 48:66-70. [PMID: 20472107 DOI: 10.1016/j.bone.2010.05.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Revised: 05/05/2010] [Accepted: 05/08/2010] [Indexed: 12/19/2022]
Abstract
The bone microenvironment is clearly an important determinant of breast cancer metastasis to bone. Once established in bone, the ability for breast cancer cells to hijack normal regulatory pathways for osteoclast differentiation, activation, and survival is known to form the basis of a vicious cycle that promotes both bone destruction and tumor growth. However, the importance of the background remodeling activity in the early stages of breast cancer metastatic establishment in bone has not been systematically investigated. Here we review recent studies that indicate that bone remodeling levels, as influenced by calcium and vitamin D status, do impact the ability of human breast cancer cells to grow in the bones of nude mice. These studies support the assessment and correction of calcium and vitamin D deficient states in women at risk of developing advanced breast cancer.
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Affiliation(s)
- Li Laine Ooi
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, Australia
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Ooi LL, Zheng Y, Zhou H, Trivedi T, Conigrave AD, Seibel MJ, Dunstan CR. Vitamin D deficiency promotes growth of MCF-7 human breast cancer in a rodent model of osteosclerotic bone metastasis. Bone 2010; 47:795-803. [PMID: 20638491 DOI: 10.1016/j.bone.2010.07.012] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 07/09/2010] [Accepted: 07/10/2010] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Breast cancer metastases to bone are common in advanced stage disease. We have recently demonstrated that vitamin D deficiency enhances breast cancer growth in an osteolytic mouse model of breast cancer metastasis. In this study, we examined the effects of vitamin D deficiency on tumor growth in an osteosclerotic model of intra-skeletal breast cancer in mice. METHODS The effects of 1,25-dihydroxyvitamin D(3) [1,25(OH)(2)D(3)] on proliferation and apoptosis of MCF-7 breast cancer cells, and changes in the expression of genes within the vitamin D metabolic pathway (VDR, 1α- and 24-hydroxylase) were examined in vitro. MCF-7 breast cancer cells were injected intra-tibially into vitamin D deficient and vitamin D sufficient mice co-treated with and without osteoprotegerin (OPG). The development of tumor-related lesions was monitored via serial X-ray analysis. Tumor burden and indices of proliferation and apoptosis were determined by histology along with markers of bone turnover and serum intact PTH levels. RESULTS In vitro, MCF-7 cells expressed critical genes for vitamin D signalling and metabolism. Treatment with 1,25(OH)(2)D(3) inhibited cell growth and proliferation, and increased apoptosis. In vivo, osteosclerotic lesions developed faster and were larger at endpoint in the tibiae of vitamin D deficient mice compared to vitamin D sufficient mice (1.49±0.08 mm(2) versus 1.68±0.15 mm(2), P<0.05). Tumor area was increased by 55.8% in vitamin D deficient mice (0.81±0.13 mm(2) versus 0.52±0.11 mm(2) in vitamin D sufficient mice). OPG treatment inhibited bone turnover and caused an increase in PTH levels, while tumor burden was reduced by 90.4% in vitamin D sufficient mice and by 92.6% in vitamin D deficient mice. Tumor mitotic activity was increased in the tibiae of vitamin D deficient mice and apoptosis was decreased, consistent with faster growth. CONCLUSION Vitamin D deficiency enhances both the growth of tumors and the tumor-induced osteosclerotic changes in the tibiae of mice following intratibial implantation of MCF-7 cells. Enhancement of tumor growth appears dependent on increased bone resorption rather than increased bone formation induced by these tumors.
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Affiliation(s)
- Li Laine Ooi
- Bone Research Program, ANZAC Research Institute, University of Sydney, Australia
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Liu PY, Kalak R, Lue Y, Jia Y, Erkkila K, Zhou H, Seibel MJ, Wang C, Swerdloff RS, Dunstan CR. Genetic and hormonal control of bone volume, architecture, and remodeling in XXY mice. J Bone Miner Res 2010; 25:2148-54. [PMID: 20499350 PMCID: PMC3153317 DOI: 10.1002/jbmr.104] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Klinefelter syndrome is the most common chromosomal aneuploidy in men (XXY karyotype, 1 in 600 live births) and results in testicular (infertility and androgen deficiency) and nontesticular (cognitive impairment and osteoporosis) deficits. The extent to which skeletal changes are due to testosterone deficiency or arise directly from gene overdosage cannot be determined easily in humans. To answer this, we generated XXY mice through a four-generation breeding scheme. Eight intact XXY and 9 XY littermate controls and 8 castrated XXY mice and 8 castrated XY littermate controls were euthanized at 1 year of age. Castration occurred 6 months prior to killing. A third group of 9 XXY and 11 XY littermates were castrated and simultaneously implanted with a 1-cm Silastic testosterone capsule 8 weeks prior to sacrifice. Tibias were harvested from all three groups and examined by micro-computed tomography and histomorphometry. Blood testosterone concentration was assayed by radioimmunoassay. Compared with intact XY controls, intact androgen-deficient XXY mice had lower bone volume (6.8% +/- 1.2% versus 8.8% +/- 1.7%, mean +/- SD, p = .01) and thinner trabeculae (50 +/- 4 µm versus 57 +/- 5 µm, p = .007). Trabecular separation (270 +/- 20 µm versus 270 +/- 20 µm) or osteoclast number relative to bone surface (2.4 +/- 1.0/mm2 versus 2.7 +/- 1.5/mm2) did not differ significantly. Testosterone-replaced XXY mice continued to show lower bone volume (5.5% +/- 2.4% versus 8.1% +/- 3.5%, p = .026). They also exhibited greater trabecular separation (380 +/- 69 µm versus 324 +/- 62 µm, p = .040) but equivalent blood testosterone concentrations (6.3 +/- 1.8 ng/mL versus 8.2 +/- 4.2 ng/mL, p = .28) compared with testosterone-replaced XY littermates. In contrast, castration alone drastically decreased bone volume (p < .001), trabecular thickness (p = .05), and trabecular separation (p < .01) to such a great extent that differences between XXY and XY mice were undetectable. In conclusion, XXY mice replicate many features of human Klinefelter syndrome and therefore are a useful model for studying bone. Testosterone deficiency does not explain the bone phenotype because testosterone-replaced XXY mice show reduced bone volume despite similar blood testosterone levels.
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Affiliation(s)
- Peter Y Liu
- Division of Endocrinology, Department of Medicine, Harbor-UCLA Medical Center and Los Angeles Biomedical Research Institute (LA BioMed) at Harbor-UCLA Medical Center, Torrance, CA, USA.
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Weber AJ, Li G, Kalak R, Street J, Buttgereit F, Dunstan CR, Seibel MJ, Zhou H. Osteoblast-targeted disruption of glucocorticoid signalling does not delay intramembranous bone healing. Steroids 2010; 75:282-6. [PMID: 20096296 DOI: 10.1016/j.steroids.2010.01.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Revised: 01/06/2010] [Accepted: 01/07/2010] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Glucocorticoids at pharmacological doses have been shown to interfere with fracture repair. The role of endogenous glucocorticoids in fracture healing is not well understood. We examined whether endogenous glucocorticoids affect bone healing in an in vivo model of cortical defect repair. METHODS Experiments were performed using a well characterised mouse model in which intracellular glucocorticoid signalling was disrupted in osteoblasts through transgenic overexpression of 11beta-hydroxysteroid-dehydrogenase type 2 (11beta-HSD2) under the control of a collagen type I promoter (Col2.3-11beta-HSD2). Unicortical bone defects (ø 0.8mm) were created in the tibiae of 7-week-old male transgenic mice and their wild-type littermates. Repair was assessed via histomorphometry, immunohistochemistry and microcomputed tomography (micro-CT) analysis at 1-3 weeks after defect creation. RESULTS At week 1, micro-CT images of the defect demonstrated formation of mineralized intramembranous bone which increased in volume and density by week 2. At week 3, healing of the defect was nearly complete in all animals. Analysis by histomorphometry and micro-CT revealed that repair of the bony defect was similar in Col2.3-11beta-HSD2 transgenic animals and their wild-type littermates at all time-points. CONCLUSION Disrupting endogenous glucocorticoid signalling in mature osteoblasts did not affect intramembranous fracture healing in a tibia defect repair model. It remains to be shown whether glucocorticoid signalling has a role in endochondral fracture healing.
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Affiliation(s)
- Agnes J Weber
- Bone Research Program, ANZAC Research Institute, The University of Sydney, Hospital Road, Concord NSW 2139, Sydney, Australia
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Ooi LL, Zhou H, Kalak R, Zheng Y, Conigrave AD, Seibel MJ, Dunstan CR. Vitamin D deficiency promotes human breast cancer growth in a murine model of bone metastasis. Cancer Res 2010; 70:1835-44. [PMID: 20160035 DOI: 10.1158/0008-5472.can-09-3194] [Citation(s) in RCA: 108] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Vitamin D exerts antiproliferative, prodifferentiation, and proapoptotic effects on nonclassic target tissues such as breast. Blood levels of 25-hydroxyvitamin D [25(OH)D], the most sensitive indicator of vitamin D status, are inversely correlated with breast cancer risk; however, a causal relationship between vitamin D deficiency and breast cancer growth in bone has not been assessed. We examined the effect of vitamin D deficiency on the intraskeletal growth of the human breast cancer cell line MDA-MB-231-TxSA in a murine model of malignant bone lesions. Subsets of mice were treated concurrently with osteoprotegerin (OPG) to abrogate bone resorption. Outcomes were assessed by repeated radiographic and end-point micro-computed tomography and histologic analyses. Mice weaned onto a vitamin D-free diet developed vitamin D deficiency within 4 weeks [mean +/- SE serum 25(OH)D: 11.5 +/- 0.5 nmol/L], which was sustained throughout the study and was associated with secondary hyperparathyroidism and accelerated bone turnover. Osteolytic lesions appeared earlier and were significantly larger in vitamin D-deficient than in vitamin D-sufficient mice after 2 weeks (radiographic osteolysis: +121.5%; histologic tumor area: +314%; P < 0.05). Although OPG treatment reduced the size of radiographic osteolyses and tumor area in both groups, tumors remained larger in OPG-treated vitamin D-deficient compared with OPG-treated vitamin D-sufficient mice (0.53 +/- 0.05 mm(2) versus 0.19 +/- 0.05 mm2; P < 0.05). We conclude that vitamin D deficiency promotes the growth of human breast cancer cells in the bones of nude mice. These effects are partly mediated through secondary changes in the bone microenvironment, along with direct effects of vitamin D on tumor growth.
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Affiliation(s)
- Li Laine Ooi
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, New South Wales, Australia
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Mak W, Shao X, Dunstan CR, Seibel MJ, Zhou H. Biphasic glucocorticoid-dependent regulation of Wnt expression and its inhibitors in mature osteoblastic cells. Calcif Tissue Int 2009; 85:538-45. [PMID: 19876584 DOI: 10.1007/s00223-009-9303-1] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Accepted: 09/30/2009] [Indexed: 11/26/2022]
Abstract
Glucocorticoids exert both anabolic and catabolic effects on bone. Previously, we reported that endogenous glucocorticoids control mesenchymal lineage commitment and osteoblastogenesis through regulation of Wnt signaling in osteoblasts. Here, we investigated the effects of glucocorticoids on Wnt expression in mature osteoblasts. Mature osteoblasts and their immature progenitors were separately isolated from Col2.3-GFP transgenic mice in which mature osteoblasts are identifiable through GFP expression. mRNA levels of Wnt2, Wnt2b, Wnt4, Wnt5a, Wnt10b, and Wnt11 were 4- to 12-fold higher in osteoblasts compared to their progenitors (P < 0.05). Expression of Wnt7b and Wnt10b in osteoblasts was modulated by corticosterone (CS), in a biphasic fashion with 3- to 3.5-fold upregulation at 10 nM CS (P < 0.01) and 50% downregulation at 100 nM CS (P < 0.05). CS 100 nM also increased expression of the Wnt inhibitors sFRP-1 and DKK-1 two- to threefold (P < 0.05). We conclude that the contrasting anabolic and catabolic effects of glucocorticoids on bone are, at least in part, mediated through the regulation of Wnt expression and its inhibitors in mature osteoblasts.
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Affiliation(s)
- Wendy Mak
- Bone Research Program, ANZAC Research Institute, The University of Sydney, Hospital Road, Concord, 2139, Sydney, NSW, Australia
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Ramaswamy Y, Wu C, Dunstan CR, Hewson B, Eindorf T, Anderson GI, Zreiqat H. Sphene ceramics for orthopedic coating applications: an in vitro and in vivo study. Acta Biomater 2009; 5:3192-204. [PMID: 19457458 DOI: 10.1016/j.actbio.2009.04.028] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2009] [Revised: 04/20/2009] [Accepted: 04/23/2009] [Indexed: 11/18/2022]
Abstract
The host response to titanium alloy (Ti-6Al-4V) is not always favorable as a fibrous layer may form at the skeletal tissue-device interface, causing aseptic loosening. Recently, sphene (CaTiSiO(5)) ceramics were developed by incorporating Ti in the Ca-Si system, and found to exhibit improved chemical stability. The aim of this study is to evaluate the in vitro response of human osteoblast-like cells, human osteoclasts and human microvascular endothelial cells to sphene ceramics and determine whether coating Ti-6Al-4V implants with sphene enhances anchorage to surrounding bone. The study showed that sphene ceramics support human osteoblast-like cell attachment with organized cytoskeleton structure and express increased mRNA levels of osteoblast-related genes. Sphene ceramics were able to induce the differentiation of monocytes to form functional osteoclasts with the characteristic features of f-actin and alpha(v)beta(3) integrin, and express osteoclast-related genes. Human endothelial cells were also able to attach and express the endothelial cell markers ZO-1 and VE-Cadherin when cultured on sphene ceramics. Histological staining, enzyme histochemistry and immunolabelling were used for identification of mineralized bone and bone remodelling around the coated implants. Ti-6Al-4V implants coated with sphene showed new bone formation and filled the gap between the implants and existing bone in a manner comparable to that of the hydroxyapatite coatings used as control. The new bone was in direct contact with the implants, whereas fibrous tissue formed between the bone and implant with uncoated Ti-6Al-4V. The in vivo assessment of sphene-coated implants supports our in vitro observation and suggests that they have the ability to recruit osteogenic cells, and thus support bone formation around the implants and enhance osseointegration.
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Affiliation(s)
- Yogambha Ramaswamy
- Tissue Engineering and Biomaterials Research Unit, Biomedical Engineering, School of AMME, Sydney, NSW 2006, Australia
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Pivonka P, Zimak J, Smith DW, Gardiner BS, Dunstan CR, Sims NA, Martin TJ, Mundy GR. Theoretical investigation of the role of the RANK-RANKL-OPG system in bone remodeling. J Theor Biol 2009; 262:306-16. [PMID: 19782692 DOI: 10.1016/j.jtbi.2009.09.021] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2009] [Revised: 08/07/2009] [Accepted: 09/10/2009] [Indexed: 11/17/2022]
Abstract
The RANK-RANKL-OPG system is an essential signaling pathway involved in bone cell-cell communication, with ample evidence that modification of the RANK-RANKL-OPG signaling pathway has major effects on bone remodeling. The first focus of this paper is to demonstrate that a theoretical model of bone cell-cell interactions is capable of qualitatively reproducing changes in bone associated with RANK-RANKL-OPG signaling. To do this we consider either biological experiments or bone diseases related to receptor and/or ligand deficiencies, including RANKL over-expression, ablation of OPG production and/or RANK receptor modifications. The second focus is to investigate a wide range of possible therapeutic strategies for re-establishing bone homeostasis for various pathologies of the RANK-RANKL-OPG pathway. These simulations indicate that bone diseases associated with the RANK-RANKL-OPG pathway are very effective in triggering bone resorption compared to bone formation. These results align with Hofbauer's "convergence hypothesis", which states that catabolic bone diseases most effectively act through the RANK-RANKL-OPG system. Additionally, we demonstrate that severity of catabolic bone diseases strongly depends on how many components of this pathway are affected. Using optimization algorithms and the theoretical model, we identify a variety of successful "virtual therapies" for different disease states using both single and dual therapies.
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Affiliation(s)
- Peter Pivonka
- University of Western Australia, WA 6009, Australia.
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Wang C, Karlis GA, Anderson GI, Dunstan CR, Carbone A, Berger G, Ploska U, Zreiqat H. Bone growth is enhanced by novel bioceramic coatings on Ti alloy implants. J Biomed Mater Res A 2009; 90:419-28. [PMID: 18523954 DOI: 10.1002/jbm.a.32111] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Calcium phosphate ceramics are widely used as coating materials to orthopedic implants and are found to enhance initial bony ingrowth by stimulating osseous apposition to the implant surface. In this study, two novel calcium orthophosphate materials were selected for coating onto the commonly used orthopedic implant material Ti-6Al- 4V. One was calcium alkali orthophosphate with the crystalline phase Ca10[K/Na](PO4)7 with a small addition of SiO2 (AW-Si) and the other was calcium orthophosphate composed of 70 mol % fluorapatite, Ca10(PO4)6F2 and 30 mol % CaZr4(PO4)6 (FA7Z). The coated implants were placed in cortical and cortico-cancellous bone of sheep femur for six weeks. Retrieved samples were tested for osseointegration and mechanical strength. It was found that both coatings produced enhanced bone/implant contact rate compared to the control when implanted in cortico-cancellous bone. This study demonstrates that the two coatings have the capability of encouraging bone growth, and hence the potential for being used as coating materials on Ti implants.
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Affiliation(s)
- Chaoyuan Wang
- Biomedical and Tissue Engineering Research Unit, School of AMME, University of Sydney, New South Wales 2006, Australia
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43
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Buttgereit F, Zhou H, Kalak R, Gaber T, Spies CM, Huscher D, Straub RH, Modzelewski J, Dunstan CR, Seibel MJ. Transgenic disruption of glucocorticoid signaling in mature osteoblasts and osteocytes attenuates K/BxN mouse serum-induced arthritis in vivo. ACTA ACUST UNITED AC 2009; 60:1998-2007. [DOI: 10.1002/art.24619] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Kalak R, Zhou H, Street J, Day RE, Modzelewski JRK, Spies CM, Liu PY, Li G, Dunstan CR, Seibel MJ. Endogenous glucocorticoid signalling in osteoblasts is necessary to maintain normal bone structure in mice. Bone 2009; 45:61-7. [PMID: 19358901 DOI: 10.1016/j.bone.2009.03.673] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Revised: 03/19/2009] [Accepted: 03/25/2009] [Indexed: 11/26/2022]
Abstract
The role of endogenous glucocorticosteroids (GC) in bone development is ill-defined. Using the Col2.3-11betaHSD2 transgenic (tg) mouse model, we examined the effect of osteoblast-targeted disruption of intracellular GC signalling on bone growth and strength, and its modulation by factors such as age, gender and skeletal site. Tibiae and L3 vertebrae of 3 and 7-week-old, male and female wild type (WT) mice and their tg, age and sex matched littermates were analysed by micro-CT and mechanical testing. Data were analysed separately for 3 and 7-week-old mice by 2-way ANOVA using genotype (WT, tg), gender and their interactions as factors. Transgenic mice were characterised by lower bone volume, lower trabecular number and higher trabecular separation in tibial trabecular bone, as well as lower tibial cortical bone area and periosteal and endosteal perimeters. These changes resulted in a marked decrease in mechanical bone strength and stiffness in sexually mature, 7-week-old mice. In the tibia, the observed transgene effect was present in 3 and 7-week-old animals, indicating that the biological effect of disrupted GC signalling was independent of sexual maturity. This was not the case for the vertebral bones, where significant differences between tg and WT mice were seen in 7 but not in 3-week-old animals, suggesting that the effects of the transgene at this site may be modulated by age and/or changes in circulating sex hormone levels. Taken together, our results demonstrate that endogenous glucocorticoids may be required for normal bone growth but that their effect on bone structure and strength varies according to the skeletal site and sexual maturity of the animals.
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Affiliation(s)
- Robert Kalak
- Bone Research Program, ANZAC Research Institute, The University of Sydney, Australia
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45
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Zhou H, Mak W, Kalak R, Street J, Fong-Yee C, Zheng Y, Dunstan CR, Seibel MJ. Glucocorticoid-dependent Wnt signaling by mature osteoblasts is a key regulator of cranial skeletal development in mice. Development 2009; 136:427-36. [PMID: 19141672 DOI: 10.1242/dev.027706] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Glucocorticoids are important regulators of bone cell differentiation and mesenchymal lineage commitment. Using a cell-specific approach of osteoblast-targeted transgenic disruption of intracellular glucocorticoid signaling, we discovered a novel molecular pathway by which glucocorticoids, mainly through the mature osteoblast, regulate the cellular mechanisms that govern cranial skeleton development. Embryonic and neonatal transgenic mice revealed a distinct phenotype characterized by hypoplasia and osteopenia of the cranial skeleton; disorganized frontal, parietal and interparietal bones; increased suture patency; ectopic differentiation of cartilage in the sagittal suture; and disturbed postnatal removal of parietal cartilage. Concurrently, expression of Mmp14, an enzyme essential for calvarial cartilage removal, was markedly reduced in parietal bone and cartilage of transgenic animals. Expression of Wnt9a and Wnt10b was significantly reduced in osteoblasts with disrupted glucocorticoid signaling, and accumulation of beta-catenin, the upstream regulator of Mmp14 expression, was decreased in osteoblasts, chondrocytes and mesenchymal progenitors of transgenic mice. Supracalvarial injection of Wnt3a protein rescued the transgenic cranial phenotype. These results define novel roles for glucocorticoids in skeletal development and delineate how osteoblasts--under steroid hormone control--orchestrate the intricate process of intramembranous bone formation by directing mesenchymal cell commitment towards osteoblastic differentiation while simultaneously initiating and controlling cartilage dissolution in the postnatal mouse.
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Affiliation(s)
- Hong Zhou
- Bone Research Program, ANZAC Research Institute, The University of Sydney, Sydney, NSW 2139, Australia.
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Herrmann M, Henneicke H, Street J, Modzelewski J, Kalak R, Buttgereit F, Dunstan CR, Zhou H, Seibel MJ. The challenge of continuous exogenous glucocorticoid administration in mice. Steroids 2009; 74:245-9. [PMID: 19071150 DOI: 10.1016/j.steroids.2008.11.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2008] [Revised: 11/10/2008] [Accepted: 11/12/2008] [Indexed: 11/24/2022]
Abstract
BACKGROUND Chronic administration of exogenous glucocorticoids is often required in experimental research. We compared the efficacy and reliability of three different methods of continuous glucocorticoid administration in mice. MATERIALS AND METHODS Male CD1 Swiss White mice aged 7-9 weeks received corticosterone (CS) or carrier by either subcutaneous (s.c.) injection (n=15), s.c. implantation of micro-osmotic pumps (n=20) or s.c. implantation of slow-release pellets (n=20). Serial blood samples were taken for the measurement of plasma CS and osteocalcin (OC). Bone structural parameters were analysed by micro-computed tomography (micro-CT) in animals treated via slow-release pellets for 4 weeks. RESULTS Injection of CS (10 mg/kg) resulted in peak plasma CS levels of up to 2600 microg/L after 1 h, with levels returning to baseline within 4 h post-injection. Micro-osmotic pumps failed to consistently alter plasma CS levels and had variable effects on plasma OC levels. Implantation of 10 mg CS pellets induced hypercorticosteronemia within 24 h but levels returned to baseline within 7 days. Plasma OC levels fell rapidly on day 1 and remained suppressed until day 7. Weekly replacement of pellets maintained elevated plasma CS and suppressed plasma OC concentrations, and resulted in significant bone loss at the tibia and spine after 28 days. CONCLUSION Once-weekly s.c. implantation of slow-release pellets to mice appears to result in relatively consistent plasma CS and OC levels with significant biological effects. However, at least in our hands, no method delivered CS at a constant rate and variability in plasma CS levels was pronounced.
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Affiliation(s)
- Markus Herrmann
- ANZAC Research Institute, The University of Sydney, and Department of Endocrinology and Metabolism, Concord Hospital, Hospital Road, Gate 3, Concord, NSW 2139, Australia.
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Pivonka P, Zimak J, Smith DW, Gardiner BS, Dunstan CR, Sims NA, John Martin T, Mundy GR. Model structure and control of bone remodeling: a theoretical study. Bone 2008; 43:249-263. [PMID: 18514606 DOI: 10.1016/j.bone.2008.03.025] [Citation(s) in RCA: 149] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Revised: 01/31/2008] [Accepted: 03/17/2008] [Indexed: 10/22/2022]
Abstract
It is generally accepted that RANKL is highly expressed in osteoblast precursor cells while OPG is highly expressed in mature osteoblasts, but to date no functional utility to the BMU has been proposed for this particular ligand-decoy-receptor expression profile. As discovered in the mid 90s, the RANK-RANKL-OPG signaling cascade is a major signaling pathway regulating bone remodeling. In this paper we study theoretically the functional implications of particular RANKL/OPG expression profiles on bone volume. For this purpose we formulate an extended bone-cell dynamics model describing functional behaviour of basic multicellular units (BMUs) responsible for bone resorption and formation. This model incorporates the RANK-RANKL-OPG signaling together with the regulating action of TGF-beta on bone cells. The bone-cell population model employed here builds on the work of Lemaire et al. (2004) [1], but incorporates the following significant modifications: (i) addition of a rate equation describing changes in bone volume with time as the key 'output function' tracking functional behaviour of BMUs, (ii) a rate equation describing release of TGF-beta from the bone matrix, (iii) expression of OPG and RANKL on both osteoblastic cell lines, and (iv) modified activator/repressor functions. Using bone volume as a functional selection criterion, we find that there is a preferred arrangement for ligand expression on particular cell types, and further, that this arrangement coincides with biological observations. We then investigate the model parameter space combinatorially, searching for preferred 'groupings' of changes in differentiation rates of various cell types. Again, a criterion of bone volume change is employed to identify possible ways of optimally controlling BMU responses. While some combinations of changes in differentiation rates are clearly unrealistic, other combinations of changes in differentiation rates are potentially functionally significant. Most importantly, the combination of parameter changes representing the signaling pathway for TGF-beta gives a unique result that appears to have a clear biological rationale. The methodological approach for the investigation of model structure described here offers a theoretical explanation as to why TGF-beta has its particular suite of biological effects on bone-cell differentiation rates.
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Affiliation(s)
- Peter Pivonka
- Department of Civil and Environmental Engineering, University of Melbourne, VIC 3010, Australia
| | - Jan Zimak
- Department of Civil and Environmental Engineering, University of Melbourne, VIC 3010, Australia
| | - David W Smith
- Department of Civil and Environmental Engineering, University of Melbourne, VIC 3010, Australia.
| | - Bruce S Gardiner
- Department of Civil and Environmental Engineering, University of Melbourne, VIC 3010, Australia
| | - Colin R Dunstan
- Bone Biology Unit, ANZAC Research Institute, Concord, NSW 2139, Australia
| | - Natalie A Sims
- Department of Medicine at St. Vincent's Hospital, University of Melbourne, VIC, 3065, Australia
| | - T John Martin
- Department of Medicine at St. Vincent's Hospital, University of Melbourne, VIC, 3065, Australia
| | - Gregory R Mundy
- Center for Bone Biology, Vanderbilt University, Nashville, 37232-0575, USA
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Zheng Y, Zhou H, Fong-Yee C, Modzelewski JRK, Seibel MJ, Dunstan CR. Bone resorption increases tumour growth in a mouse model of osteosclerotic breast cancer metastasis. Clin Exp Metastasis 2008; 25:559-67. [PMID: 18421566 DOI: 10.1007/s10585-008-9172-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2007] [Accepted: 04/03/2008] [Indexed: 11/30/2022]
Abstract
Osteosclerotic metastases account for 20% of breast cancer metastases with the remainder osteolytic or mixed. In mouse models, osteolytic metastases are dependent on bone resorption for their growth. However, whether the growth of osteosclerotic bone metastases depends on osteoclast or osteoblast actions is uncertain. In this study, we investigate the effects of high and low bone resorption on tumour growth in a mouse model of osteosclerotic metastasis. We implanted human breast cancer, MCF-7, cells into the tibiae of mice. Low and high levels of bone resorption were induced by osteoprotegerin (OPG) treatment or calcium deficient diet respectively. We demonstrate that OPG treatment significantly reduces tumour area compared to vehicle (0.42 +/- 0.06 vs. 1.27 +/- 0.16 mm2, P < 0.01) in association with complete inhibition of osteoclast differentiation. In contrast, low calcium diet increases tumour area compared to normal diet (0.90 +/- 0.30 vs. 0.58 +/- 0.20 mm2, P < 0.05) in association with increased osteoclast numbers (84.44 +/- 5.18 vs. 71.11 +/- 3.56 per mm2 bone lesion area, P < 0.05). Osteoblast surfaces and new woven bone formation were similarly increased within the tumour boundaries in all treatment groups. Tumour growth in this model of osteosclerotic metastasis is dependent on ongoing bone resorption, as has been observed in osteolytic models. Bone resorption, rather than bone formation, apparently mediates this effect as osteoblast surfaces in the tumour mass were unchanged by treatments. Treatment of breast cancer patients through correction of calcium deficiency and/or with anti-resorptive agents such as OPG, may improve patient outcomes in the adjuvant as well as palliative settings.
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Affiliation(s)
- Yu Zheng
- Bone Research Program, ANZAC Research Institute, University of Sydney, Hospital Road, Concord, Sydney, Australia
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Zhou H, Mak W, Zheng Y, Dunstan CR, Seibel MJ. Osteoblasts directly control lineage commitment of mesenchymal progenitor cells through Wnt signaling. J Biol Chem 2007; 283:1936-45. [PMID: 18045882 DOI: 10.1074/jbc.m702687200] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Lineage commitment of mesenchymal progenitor cells is still poorly understood. Here we demonstrate that Wnt signaling by osteoblasts is essential for mesenchymal progenitor cells to differentiate away from a default adipogenic into an osteoblastic lineage. Dominant adipogenesis and reduced osteoblastogenesis were observed in calvarial cell cultures from transgenic mice characterized by osteoblast-targeted disruption of glucocorticoid signaling. This phenotypic shift in mesenchymal progenitor cell commitment was associated with reciprocal regulation of early adipogenic and osteoblastogenic transcription factors and with a reduction in Wnt7b and Wnt10b mRNA and beta-catenin protein levels in transgenic versus non-transgenic cultures. Transwell co-culture of transgenic mesenchymal progenitor cells with wild type osteoblasts restored commitment to the osteoblast lineage. This effect was blocked by adding sFRP1, a Wnt inhibitor, to the co-culture. Treatment of transgenic cultures with Wnt3a resulted in stimulation of osteoblastogenesis and suppression of adipogenesis. Our findings suggest a novel cellular mechanism in bone cell biology in which osteoblasts exert direct control over the lineage commitment of their mesenchymal progenitor through Wnt signaling. This glucocorticoid-dependent forward control function indicates a central role for osteoblasts in the regulation of early osteoblastogenesis.
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Affiliation(s)
- Hong Zhou
- Bone Research Program, ANZAC Research Institute, The University of Sydney, Sydney 2139, NSW, Australia.
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Zheng Y, Zhou H, Modzelewski JRK, Kalak R, Blair JM, Seibel MJ, Dunstan CR. Accelerated bone resorption, due to dietary calcium deficiency, promotes breast cancer tumor growth in bone. Cancer Res 2007; 67:9542-8. [PMID: 17909065 DOI: 10.1158/0008-5472.can-07-1046] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The skeleton is a major site of breast cancer metastases. High bone turnover increases risk of disease progression and death. However, there is no direct evidence that high bone turnover is causally associated with the establishment and progression of metastases. In this study, we investigate the effects of high bone turnover in a model of breast cancer growth in bone. Female nude mice commenced a diet containing normal (0.6%; 'Normal-Ca') or low (0.1%; 'Low-Ca') calcium content. Mice were concurrently treated with vehicle or osteoprotegerin (1 mg/kg/d s.c; n = 16 per group). Three days later (day 0), 50,000 Tx-SA cells (variant of MDA-MB-231 cells) were implanted by intratibial injection. On day 0, mice receiving Low-Ca had increased serum parathyroid hormone (PTH) and tartrate-resistant acid phosphatase 5b levels, indicating secondary hyperparathyroidism and high bone turnover, which was maintained until day 17. Osteoprotegerin increased serum PTH but profoundly reduced bone resorption. On day 17, in mice receiving Low-Ca alone, lytic lesion area, tumor area, and cancer cell proliferation increased by 43%, 24%, and 24%, respectively, compared with mice receiving Normal Ca (P < 0.01). Osteoprotegerin treatment completely inhibited lytic lesions, reduced tumor area, decreased cancer cell proliferation, and increased cancer cell apoptosis. Increased bone turnover, due to dietary calcium deficiency, promotes tumor growth in bone, independent of the action of PTH. Breast cancer patients frequently have low dietary calcium intake and high bone turnover. Treatment to correct calcium insufficiency and/or treatment with antiresorptive agents, such as osteoprotegerin, may be of benefit in the adjuvant as well as palliative setting.
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Affiliation(s)
- Yu Zheng
- Bone Research Program, ANZAC Research Institute, University of Sydney, Sydney, New South Wales, Australia
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