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Jiménez-Holguín J, Lozano D, Saiz-Pardo M, de Pablo D, Ortega L, Enciso S, Fernández-Tomé B, Díaz-Güemes I, Sánchez-Margallo FM, Portolés MT, Arcos D. Osteogenic-angiogenic coupled response of cobalt-containing mesoporous bioactive glasses in vivo. Acta Biomater 2024; 176:445-457. [PMID: 38190928 DOI: 10.1016/j.actbio.2024.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 12/15/2023] [Accepted: 01/03/2024] [Indexed: 01/10/2024]
Abstract
The incorporation of cobalt ions into the composition of bioactive glasses has emerged as a strategy of interest for bone regeneration purposes. In the present work, we have designed a set of bioactive mesoporous glasses SiO2-CaO-P2O5-CoO (Co-MBGs) with different amounts of cobalt. The physicochemical changes introduced by the Co2+ ion, the in vitro effects of Co-MBGs on preosteoblasts and endothelial cells and their in vivo behaviour using them as bone grafts in a sheep model were studied. The results show that Co2+ ions neither destroy mesoporous ordering nor inhibit in vitro bioactive behaviour, exerting a dual role as network former and modifier for CoO concentrations above 3 % mol. On the other hand, the activity of Co-MBGs on MC3T3-E1 preosteoblasts and HUVEC vascular endothelial cells is dependent on the concentration of CoO present in the glass. For low Co-MBGs concentrations (1mg/ml) cell viability is not affected, while the expression of osteogenic (ALP, RUNX2 and OC) and angiogenic (VEGF) genes is stimulated. For Co-MBGs concentration of 5 mg/ml, cell viability decreases as a function of the CoO content. In vivo studies show that the incorporation of Co2+ ions to the MBGs improves the bone regeneration activity of these materials, despite the deleterious effect that this ion has on bone-forming cells for any of the Co-MBG compositions studied. This contradictory effect is explained by the marked increase in angiogenesis that takes place inside the bone defect, leading to an angiogenesis-osteogenesis coupling that compensates for the partial decrease in osteoblast cells. STATEMENT OF SIGNIFICANCE: The development of new bone grafts implies to address the need for osteogenesis-angiogenesis coupling that allows bone regeneration with viable tissue in the long term. In this sense the incorporation of cobalt ions into the composition of bioactive glasses has emerged as a strategy of great interest in this field. Due to the potential cytotoxic effect of cobalt ions, there is an important controversy regarding the suitability of their incorporation in bone grafts. In this work, we address this controversy after the implantation of cobalt-doped mesoporous bioactive glasses in a sheep model. The incorporation of cobalt ions in bioactive glasses improves the bone regeneration ability of these bone grafts, due to enhancement of the angiogenesis-osteogenesis coupling.
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Affiliation(s)
- J Jiménez-Holguín
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, Madrid 28040, Spain
| | - D Lozano
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, Madrid 28040, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Madrid 28040, Spain
| | - M Saiz-Pardo
- Servicio de Anatomía Patológica, Hospital Clínico San Carlos, Facultad de Medicina Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), Madrid 28040, Spain
| | - D de Pablo
- Servicio de Anatomía Patológica, Hospital Clínico San Carlos, Facultad de Medicina Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), Madrid 28040, Spain
| | - L Ortega
- Servicio de Anatomía Patológica, Hospital Clínico San Carlos, Facultad de Medicina Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital Clínico San Carlos (IdISSC), Madrid 28040, Spain
| | - S Enciso
- Centro de Cirugía de Mínima Invasión Jesús Usón, NANBIOSIS, Cáceres, Spain
| | - B Fernández-Tomé
- Centro de Cirugía de Mínima Invasión Jesús Usón, NANBIOSIS, Cáceres, Spain
| | - I Díaz-Güemes
- Centro de Cirugía de Mínima Invasión Jesús Usón, NANBIOSIS, Cáceres, Spain
| | | | - M T Portolés
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid 28040, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Madrid 28040, Spain.
| | - D Arcos
- Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Plaza Ramón y Cajal s/n, Madrid 28040, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Madrid 28040, Spain.
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2
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Baino F, Montazerian M, Verné E. Cobalt-Doped Bioactive Glasses for Biomedical Applications: A Review. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4994. [PMID: 37512268 PMCID: PMC10382018 DOI: 10.3390/ma16144994] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/08/2023] [Accepted: 07/11/2023] [Indexed: 07/30/2023]
Abstract
Improving angiogenesis is the key to the success of most regenerative medicine approaches. However, how and to which extent this may be performed is still a challenge. In this regard, cobalt (Co)-doped bioactive glasses show promise being able to combine the traditional bioactivity of these materials (especially bone-bonding and osteo-stimulatory properties) with the pro-angiogenic effect associated with the release of cobalt. Although the use and local delivery of Co2+ ions into the body have raised some concerns about the possible toxic effects on living cells and tissues, important biological improvements have been highlighted both in vitro and in vivo. This review aims at providing a comprehensive overview of Co-releasing glasses, which find biomedical applications as various products, including micro- and nanoparticles, composites in combination with biocompatible polymers, fibers and porous scaffolds. Therapeutic applications in the field of bone repair, wound healing and cancer treatment are discussed in the light of existing experimental evidence along with the open issues ahead.
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Affiliation(s)
- Francesco Baino
- Institute of Materials Physics and Engineering, Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy
| | - Maziar Montazerian
- Northeastern Laboratory for Evaluation and Development of Biomaterial (CERTBIO), Federal University of Campina Grande, Campina Grande 58429-900, PB, Brazil
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, State College, PA 16801, USA
| | - Enrica Verné
- Institute of Materials Physics and Engineering, Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy
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3
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Choi BH, Cho TJ, Lee T, Park CS. Hypoxia-inducible factor-1α-mediated SERPINE-1 expression in ischemic urinary bladder. Mol Cell Toxicol 2023. [DOI: 10.1007/s13273-023-00334-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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4
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Yuan T, Tan M, Xu Y, Xiao Q, Wang H, Wu C, Li F, Peng L. All-in-one smart dressing for simultaneous angiogenesis and neural regeneration. J Nanobiotechnology 2023; 21:38. [PMID: 36737778 PMCID: PMC9896818 DOI: 10.1186/s12951-023-01787-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 01/15/2023] [Indexed: 02/05/2023] Open
Abstract
Wound repair, along with skin appendage regeneration, is challenged by insufficient angiogenesis and neural regeneration. Therefore, promoting both proangiogenic and neuro-regenerative therapeutic effects is essential for effective wound repair. However, most therapeutic systems apply these strategies separately or ineffectively. This study investigates the performance of an all-in-one smart dressing (ASD) that integrates angiogenic functional materials and multiple biological factors within a light crosslinked hydrogel, forming a multi-functional dressing capable of facilitating simultaneous micro-vascularization and neural regeneration. The ASD uses a zeolite-imidazolate framework 67 with anchored vanadium oxide (VO2@ZIF-67) that allows for the on-demand release of Co2+ with fluctuations in pH at the wound site to stimulate angiogenesis. It can simultaneously release CXCL12, ligustroflavone, and ginsenoside Rg1 in a sustained manner to enhance the recruitment of endogenous mesenchymal stem cells, inhibit senescence, and induce neural differentiation to achieve in situ nerve regeneration. The ASD can stimulate rapid angiogenesis and nerve regeneration within 17 days through multiple angiogenic and neuro-regenerative cues within one dressing. This study provides a proof-of-concept for integrating functional nanomaterials and multiple complementary drugs within a smart dressing for simultaneous angiogenesis and neural regeneration.
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Affiliation(s)
- Tiejun Yuan
- grid.13402.340000 0004 1759 700XCollege of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058 People’s Republic of China
| | - Minhong Tan
- grid.13402.340000 0004 1759 700XCollege of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058 People’s Republic of China ,grid.13402.340000 0004 1759 700XCollege of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027 People’s Republic of China
| | - Yang Xu
- grid.13402.340000 0004 1759 700XCollege of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058 People’s Republic of China
| | - Qiyao Xiao
- grid.13402.340000 0004 1759 700XCollege of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058 People’s Republic of China
| | - Hui Wang
- grid.13402.340000 0004 1759 700XCollege of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027 People’s Republic of China
| | - Chen Wu
- grid.13402.340000 0004 1759 700XCollege of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027 People’s Republic of China
| | - Fulun Li
- grid.412540.60000 0001 2372 7462Department of Dermatology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 200437 People’s Republic of China
| | - Lihua Peng
- grid.13402.340000 0004 1759 700XCollege of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058 People’s Republic of China ,grid.259384.10000 0000 8945 4455State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, People’s Republic of China
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Yuan T, Wang H, Tan M, Xu Y, Xiao Q, Wu C, Peng L. ZIF@VO 2 as an Intelligent Nano-Reactor for On-Demand Angiogenesis and Disinfection. Adv Healthc Mater 2023; 12:e2201608. [PMID: 36251588 DOI: 10.1002/adhm.202201608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Indexed: 02/03/2023]
Abstract
Absent angiogenesis and bacterial infection are two major challenges that simultaneously delay the repair of injured tissues and organs. However, most current therapeutic systems deliver therapeutic cues in a separate and inaccurate manner which stimulates angiogenesis or inhibits infection leading to limited repair and side effects. Advanced therapeutic systems capable of providing accurate angiogenic stimulation and anti-infection signals in response to the changing microenvironment are urgently needed. Herein, a nano-reactor (ZFVO) involving zeolitic imidazolate framework-67 (ZIF-67)-deposited hollow vanadium oxide (VO2 ) is developed to intelligently execute pro-angiogenesis and/or disinfection via the responsive release of cobalt ions and hydroxyl radicals to the injury and infection sites, respectively. ZFVO nano-reactor demonstrates a novel strategy for constructing drug-free nano-platforms with a hierarchical structure which has potential for the accurate treatment of trauma and orthopedic diseases.
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Affiliation(s)
- Tiejun Yuan
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Hui Wang
- College of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027, P. R. China
| | - Minhong Tan
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, P. R. China
- College of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027, P. R. China
| | - Yang Xu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Qiyao Xiao
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Chen Wu
- College of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027, P. R. China
| | - Lihua Peng
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, P. R. China
- State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau, 999078, P. R. China
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6
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Li J, Zhao C, Liu C, Wang Z, Ling Z, Lin B, Tan B, Zhou L, Chen Y, Liu D, Zou X, Liu W. Cobalt-doped bioceramic scaffolds fabricated by 3D printing show enhanced osteogenic and angiogenic properties for bone repair. Biomed Eng Online 2021; 20:70. [PMID: 34303371 PMCID: PMC8306242 DOI: 10.1186/s12938-021-00907-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 07/15/2021] [Indexed: 11/22/2022] Open
Abstract
Background The bone regeneration of artificial bone grafts is still in need of a breakthrough to improve the processes of bone defect repair. Artificial bone grafts should be modified to enable angiogenesis and thus improve osteogenesis. We have previously revealed that crystalline Ca10Li(PO4)7 (CLP) possesses higher compressive strength and better biocompatibility than that of pure beta-tricalcium phosphate (β-TCP). In this work, we explored the possibility of cobalt (Co), known for mimicking hypoxia, doped into CLP to promote osteogenesis and angiogenesis. Methods We designed and manufactured porous scaffolds by doping CLP with various concentrations of Co (0, 0.1, 0.25, 0.5, and 1 mol%) and using 3D printing techniques. The crystal phase, surface morphology, compressive strength, in vitro degradation, and mineralization properties of Co-doped and -undoped CLP scaffolds were investigated. Next, we investigated the biocompatibility and effects of Co-doped and -undoped samples on osteogenic and angiogenic properties in vitro and on bone regeneration in rat cranium defects. Results With increasing Co-doping level, the compressive strength of Co-doped CLP scaffolds decreased in comparison with that of undoped CLP scaffolds, especially when the Co-doping concentration increased to 1 mol%. Co-doped CLP scaffolds possessed excellent degradation properties compared with those of undoped CLP scaffolds. The (0.1, 0.25, 0.5 mol%) Co-doped CLP scaffolds had mineralization properties similar to those of undoped CLP scaffolds, whereas the 1 mol% Co-doped CLP scaffolds shown no mineralization changes. Furthermore, compared with undoped scaffolds, Co-doped CLP scaffolds possessed excellent biocompatibility and prominent osteogenic and angiogenic properties in vitro, notably when the doping concentration was 0.25 mol%. After 8 weeks of implantation, 0.25 mol% Co-doped scaffolds had markedly enhanced bone regeneration at the defect site compared with that of the undoped scaffold. Conclusion In summary, CLP doped with 0.25 mol% Co2+ ions is a prospective method to enhance osteogenic and angiogenic properties, thus promoting bone regeneration in bone defect repair. Supplementary Information The online version contains supplementary material available at 10.1186/s12938-021-00907-2.
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Affiliation(s)
- Jungang Li
- Department of Orthopaedics, Fujian Medical University Union Hospital, Fuzhou, 350001, China
| | - Chaoqian Zhao
- Key Laboratory of Optoelectronic Materials Chemical and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China
| | - Chun Liu
- Guangdong Provincial Key Laboratory of Orthopaedics and Traumatology, Department of Spine Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Zhenyu Wang
- Department of Orthopaedics, Fujian Medical University Union Hospital, Fuzhou, 350001, China
| | - Zeming Ling
- Guangdong Provincial Key Laboratory of Orthopaedics and Traumatology, Department of Spine Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Bin Lin
- Department of Orthopaedics, Fujian Medical University Union Hospital, Fuzhou, 350001, China
| | - Bizhi Tan
- Guangdong Provincial Key Laboratory of Orthopaedics and Traumatology, Department of Spine Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Linquan Zhou
- Department of Orthopaedics, Fujian Medical University Union Hospital, Fuzhou, 350001, China
| | - Yan Chen
- Guangdong Provincial Key Laboratory of Orthopaedics and Traumatology, Department of Spine Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Delong Liu
- Guangdong Provincial Key Laboratory of Orthopaedics and Traumatology, Department of Spine Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Xuenong Zou
- Guangdong Provincial Key Laboratory of Orthopaedics and Traumatology, Department of Spine Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China.
| | - Wenge Liu
- Department of Orthopaedics, Fujian Medical University Union Hospital, Fuzhou, 350001, China.
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7
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Taulescu CA, Taulescu M, Suciu M, Bolunduț LC, Pășcuța P, Toma C, Urda-Cîmpean A, Dreanca A, Șenilă M, Cadar O, Ștefan R. A novel therapeutic phosphate-based glass improves full-thickness wound healing in a rat model. Biotechnol J 2021; 16:e2100031. [PMID: 34242476 DOI: 10.1002/biot.202100031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 06/16/2021] [Accepted: 06/21/2021] [Indexed: 01/06/2023]
Abstract
Wound healing is a highly dynamic process and innovative therapeutic approaches are currently developed to address challenges of providing optimal wound care. In this study, phosphate-based glasses in the (CuO)x ·(KPO3 )79.5-x ·(ZnO)20 ·(Ag2 O)0.5 system (CuKPO3 ZnAg), with different CuO/ KPO3 ratios were prepared by melt-quenching technique. Constant Cu concentrations were released from the samples during immersion in Simulated Body Fluid (SBF), while Zn concentrations were slightly decreased over time. Glass surface phosphatation leading to formation of Zn crystalline salts was revealed through spectroscopic techniques. This finding was supported by SEM images that illustrated new compound formation. Subsequent cytotoxicity evaluation on HaCaT Keratinocytes using the indirect MTT cell viability assay revealed a CuO concentration-dependent cytotoxicity profile and excellent biocompatibility at low CuO concentrations, in all CuKPO3 ZnAg glasses. Furthermore, the (CuO)5 ·(KPO3 )74.5 ·(ZnO)20 ·(Ag2 O)0.5 sample (5CuKPO3 ZnAg), demonstrated superior antibacterial potency against S. aureus (ATCC 25923) strain compared to amoxicillin and ciprofloxacin. In vivo full-thickness wound healing evaluation showed a significantly higher regenerative effect of the 5CuKPO3 ZnAg sample, in terms of angiogenesis, collagen synthesis and re-epithelialization compared to non-treated wounds. These findings advance our understanding of the therapeutic perspectives of phosphate-based glasses, showing promising potential for wound-healing applications.
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Affiliation(s)
- Cristina A Taulescu
- Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Romania
| | - Marian Taulescu
- Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Romania.,Synevovet laboratory, Bucharest, Romania
| | - Maria Suciu
- Electron Microscopy Integrated Laboratory (LIME-CETATEA), National Institute for R&D of Isotopic and Molecular Technologies (INCDTIM), Cluj-Napoca, Romania.,Faculty of Biology and Geology, Babeș-Bolyai University, Cluj-Napoca, Romania
| | - Liviu C Bolunduț
- Physics and Chemistry Department, Technical University of Cluj-Napoca, Cluj-Napoca, Romania
| | - Petru Pășcuța
- Physics and Chemistry Department, Technical University of Cluj-Napoca, Cluj-Napoca, Romania
| | - Corina Toma
- Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Romania
| | - Andrada Urda-Cîmpean
- Faculty of Medicine, "Iuliu Hațieganu" University of Medicine and Pharmacy, Cluj-Napoca, Romania
| | - Alexandra Dreanca
- Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Romania
| | - Marin Șenilă
- INCDO-INOE 2000, Research Institute for Analytical Instrumentation, Cluj-Napoca, Romania
| | - Oana Cadar
- INCDO-INOE 2000, Research Institute for Analytical Instrumentation, Cluj-Napoca, Romania
| | - Răzvan Ștefan
- Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine, Cluj-Napoca, Romania
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8
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Zheng Y, Yang Y, Deng Y. Dual therapeutic cobalt-incorporated bioceramics accelerate bone tissue regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 99:770-782. [PMID: 30889752 DOI: 10.1016/j.msec.2019.02.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 01/16/2019] [Accepted: 02/06/2019] [Indexed: 01/28/2023]
Abstract
Bone grafting on defects caused by trauma or tumor stimulates bone regeneration, a complex process requiring highly orchestrated cell-signal interactions. Bone vascular growth is coupled with osteogenesis, but less is known about the interplay between angiogenesis and osteogenesis. Understanding this relationship is relevant to improved bone regeneration. Here, tricalcium phosphate (TCP) scaffolds doped with varying concentration of cobalt (Co-TCP) were designed to investigate the dosage effect of vascularization on bone formation. The surface structure, phase composition, mechanical features, and chemical composition were investigated. Co doping improved the mechanical properties of TCP. Co-TCP, particularly 2% and 5% Co-TCP, boosted cell viability of bone marrow stromal cells (BMSCs). The 2% Co-TCP promoted alkaline phosphatase activity, matrix mineralization, and expression of osteogenic genes in BMSCs in vitro. However, excessive Co doping decreased TCP-induced osteogenesis. Meanwhile, Co-TCP dose-dependently favored the growth and migration of human umbilical vein endothelial cells (HUVECs), and the expression of vascular endothelial growth factor (VEGF). The 2% Co-TCP significantly shrank the defect area in rat alveolar bone compared with TCP. Smaller bone volume and more abundant blood vessels were observed for 5% Co-TCP compared with 2% Co-TCP. The CD31 immunostaining in the 5% Co-TCP group was more intense than the other two groups, indicating of the increment of endothelium cells. Besides, 5% Co-TCP led to mild inflammatory response in bone defect area. Overall, TCP doped appropriately with Co has positive effect on osteogenesis, while excessive Co suppressed osteoblast differentiation and bone formation. These data indicate that vascularization within a proper range promotes osteogenesis, which may be a design consideration for bone grafts.
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Affiliation(s)
- Yunfei Zheng
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China
| | - Yuanyi Yang
- Department of Materials Engineering, Sichuan College of Architectural Technology, Deyang 618000, China
| | - Yi Deng
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China; Department of Mechanical Engineering, The University of Hong Kong, Hong Kong SAR, China.
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9
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Raja FNS, Worthington T, Isaacs MA, Forto Chungong L, Burke B, Addison O, Martin RA. The Antimicrobial Efficacy of Hypoxia Mimicking Cobalt Oxide Doped Phosphate-Based Glasses against Clinically Relevant Gram Positive, Gram Negative Bacteria and a Fungal Strain. ACS Biomater Sci Eng 2019; 5:283-293. [PMID: 33405859 DOI: 10.1021/acsbiomaterials.8b01045] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Bioactive phosphate glasses are of considerable interest for a range of soft and hard tissue engineering applications. The glasses are degradable and can release biologically important ions in a controlled manner. The glasses can also potentially be used as an antimicrobial delivery system. In the given study, novel cobalt-doped phosphate-based glasses, (P2O5)50(Na2O)20(CaO)30-x(CoO)x where 0 ≤ x (mol %) ≤ 10, were manufactured and characterized. As the cobalt oxide concentration increased, the rate of dissolution was observed to decrease. The antimicrobial potential of the glasses was studied using direct and indirect contact methods against both Escherichia coli (NCTC 10538) Staphylococcus aureus (ATCC 6538) and Candida albicans (ATCC 76615). The results showed strong, time dependent, and strain specific antimicrobial activity of the glasses against microorganisms when in direct contact. Antimicrobial activity (R) ≥ 2 was observed within 2 h against Escherichia coli, whereas a similar effect was achieved in 6 h against Staphylococcus aureus and Candida albicans. However, when in indirect contact, the dissolution products from the bioactive glasses failed to show an antimicrobial effect. Following direct exposure to the glasses for 7 days, osteoblast-like SAOS-2 cells showed a 5-fold increase in VEGF mRNA while THP-1 monocytic cells showed a 4-fold increase in VEGF mRNA expression when exposed to 10% CoO-doped glass compared with the cobalt free control glass. Endothelial cells stimulated with conditioned medium taken from cell cultures of THP-1 monocytes exposed to 10% CoO doped glass showed clear tubelike structure (blood vessel) formation after 4 h.
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Affiliation(s)
- Farah N S Raja
- School of Life & Health Science and Aston Research Centre for Healthy Ageing, Aston University, Aston Triangle, Birmingham, B4 7ET, United Kingdom
| | - T Worthington
- School of Life & Health Science and Aston Research Centre for Healthy Ageing, Aston University, Aston Triangle, Birmingham, B4 7ET, United Kingdom
| | - Mark A Isaacs
- Department of Chemistry, University College London, 20 Gordon Street, Kings Cross, London, WC1H 0AJ, United Kingdom
| | - Louis Forto Chungong
- School of Engineering & Applied Science and Aston Institute of Materials Research. Aston University, Aston Triangle, Birmingham, B4 7ET, United Kingdom
| | - Bernard Burke
- School of Life Sciences, Coventry University, Coventry, CV1 2DS, United Kingdom.,Biomaterials Unit, University of Birmingham School of Dentistry, Birmingham, B5 7EG, United Kingdom
| | - Owen Addison
- Biomaterials Unit, University of Birmingham School of Dentistry, Birmingham, B5 7EG, United Kingdom.,University of Alberta, School of Dentistry, Edmonton, Alberta Canada, T6G 1C9
| | - Richard A Martin
- School of Engineering & Applied Science and Aston Institute of Materials Research. Aston University, Aston Triangle, Birmingham, B4 7ET, United Kingdom
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10
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Erbay AR, Ede H, Zengin K, Erkoc MF, Tanık S, Albayrak S, Yetkin E. Association of Prostatic Volume and Carotid Intima-media Thickness in Patients With Benign Prostatic Hyperplasia. Urology 2018; 113:166-170. [DOI: 10.1016/j.urology.2017.11.051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 11/20/2017] [Accepted: 11/30/2017] [Indexed: 11/30/2022]
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11
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Iguchi N, Malykhina AP, Wilcox DT. Inhibition of HIF Reduces Bladder Hypertrophy and Improves Bladder Function in Murine Model of Partial Bladder Outlet Obstruction. J Urol 2016; 195:1250-6. [PMID: 26926557 DOI: 10.1016/j.juro.2015.08.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/01/2015] [Indexed: 01/31/2023]
Abstract
PURPOSE Posterior urethral valves are the most common cause of partial bladder outlet obstruction in the pediatric population. However, to our knowledge the etiology and the detailed mechanisms underlying pathological changes in the bladder following partial bladder outlet obstruction remain to be elucidated. Recent findings suggest that hypoxia and associated up-regulation of HIFs (hypoxia-inducible factors) have a key role in partial bladder outlet obstruction induced pathology in the bladder. We examined the effects of pharmacological inhibition of HIF pathways by 17-DMAG (17-(dimethylaminoethylamino)-17-demethoxygeldanamycin) in pathophysiological phenotypes after partial bladder outlet obstruction. MATERIALS AND METHODS Partial bladder outlet obstruction was surgically created in male C57BL/6J mice. The animals received oral administration of 17-DMAG or vehicle daily starting from the initiation of obstruction up to 5 days. Sham operated mice served as controls. Bladders were harvested from each group 2, 4 and 7 days postoperatively, and analyzed for histological and biochemical changes. Bladder function was assessed by in vitro muscle contractility recordings. RESULTS Partial bladder outlet obstruction caused a significant increase in the bladder mass accompanying enhanced collagen deposition in the bladder wall while 17-DMAG treatment suppressed those increases. Treatment with 17-DMAG attenuated the degree of up-regulation of HIFs and their target genes involving the development of tissue fibrosis in obstructed bladders. Treatment with 17-DMAG improved the decreased responses of obstructed bladder strips to electrical field stimulation and KCl. CONCLUSIONS In vivo 17-DMAG treatment decreased partial bladder outlet obstruction induced pathophysiological changes in the bladder. HIF pathway inhibition has a potential clinical implication for the development of novel pharmacological therapies to treat bladder pathology associated with partial bladder outlet obstruction.
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Affiliation(s)
- Nao Iguchi
- Division of Urology, Department of Surgery, University of Colorado School of Medicine, Aurora, Colorado
| | - Anna P Malykhina
- Division of Urology, Department of Surgery, University of Colorado School of Medicine, Aurora, Colorado
| | - Duncan T Wilcox
- Division of Urology, Department of Surgery, University of Colorado School of Medicine, Aurora, Colorado; Children's Hospital Colorado, Aurora, Colorado.
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Hoppe A, Brandl A, Bleiziffer O, Arkudas A, Horch RE, Jokic B, Janackovic D, Boccaccini AR. In vitro cell response to Co-containing 1393 bioactive glass. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 57:157-63. [DOI: 10.1016/j.msec.2015.07.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Revised: 06/21/2015] [Accepted: 07/09/2015] [Indexed: 02/07/2023]
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Ekman M, Uvelius B, Albinsson S, Swärd K. HIF-mediated metabolic switching in bladder outlet obstruction mitigates the relaxing effect of mitochondrial inhibition. J Transl Med 2014; 94:557-68. [PMID: 24589856 DOI: 10.1038/labinvest.2014.48] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Revised: 01/27/2014] [Accepted: 02/10/2014] [Indexed: 12/21/2022] Open
Abstract
Prior work demonstrated increased levels of hypoxia-inducible factor-1α (HIF-1α) in the bladder following outlet obstruction, associated with bladder growth and fibrosis. Here we hypothesized that HIF induction in outlet obstruction also switches energetic support of contraction from mitochondrial respiration to glycolysis. To address this hypothesis, we created infravesical outlet obstruction in female Sprague-Dawley rats and examined HIF induction and transcriptional activation. HIF-1α increased after 6 weeks of outlet obstruction as assessed by western blotting and yet transcription factor-binding site analysis indicated HIF activation already at 10 days of obstruction. Accumulation HIF-2α and of Arnt2 proteins were found at 10 days, providing an explanation for the lack of correlation between HIF-1α protein and transcriptional activation. HIF signature targets, including Slc2a1, Tpi1, Eno1 and Ldha increased in obstructed compared with sham-operated bladders. The autophagy markers Bnip3 and LC3B-II were also increased at 6 week of obstruction, but electron microscopy did not support mitophagy. Mitochondria were, however, remodeled with increased expression of Cox4 compared with other markers. In keeping with a switch toward glycolytic support of contraction, we found that relaxation by the mitochondrial inhibitor cyanide was reduced in obstructed bladders. This was mimicked by organ culture with the HIF-inducer dimethyloxalylglycine, which also upregulated expression of Ldha. On the basis of these findings, we conclude that HIF activation in outlet obstruction involves mechanisms beyond the accumulation of HIF-1α protein and that it results in a switch of the energetic support of contraction to anaerobic glycolysis. This metabolic adaptation encompasses increased expression of glucose transporters and glycolytic enzymes combined with mitochondrial remodeling. Together, these changes uphold contractility when mitochondrial respiration is limited.
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Affiliation(s)
- Mari Ekman
- 1] Department of Experimental Medical Science, Lund University, Biomedical Centre, BMC D12, Lund, Sweden [2] Department of Biology, Faculty of Science, Sölvegatan 35, Lund, Sweden
| | - Bengt Uvelius
- Department of Urology, Clinical Sciences, Lund University, Lund, Sweden
| | - Sebastian Albinsson
- Department of Experimental Medical Science, Lund University, Biomedical Centre, BMC D12, Lund, Sweden
| | - Karl Swärd
- Department of Experimental Medical Science, Lund University, Biomedical Centre, BMC D12, Lund, Sweden
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Hoppe A, Jokic B, Janackovic D, Fey T, Greil P, Romeis S, Schmidt J, Peukert W, Lao J, Jallot E, Boccaccini AR. Cobalt-releasing 1393 bioactive glass-derived scaffolds for bone tissue engineering applications. ACS APPLIED MATERIALS & INTERFACES 2014; 6:2865-77. [PMID: 24476347 DOI: 10.1021/am405354y] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Loading biomaterials with angiogenic therapeutics has emerged as a promising approach for developing superior biomaterials for engineering bone constructs. In this context, cobalt-releasing materials are of interest as Co is a known angiogenic agent. In this study, we report on cobalt-releasing three-dimensional (3D) scaffolds based on a silicate bioactive glass. Novel melt-derived "1393" glass (53 wt % SiO2, 6 wt % Na2O, 12 wt % K2O, 5 wt % MgO, 20 wt % CaO, and 4 wt % P2O5) with CoO substituted for CaO was fabricated and was used to produce a 3D porous scaffold by the foam replica technique. Glass structural and thermal properties as well as scaffold macrostructure, compressive strength, acellular bioactivity, and Co release in simulated body fluid (SBF) were investigated. In particular, detailed insights into the physicochemical reactions occurring at the scaffold-fluid interface were derived from advanced micro-particle-induced X-ray emission/Rutherford backscattering spectrometry analysis. CoO is shown to act in a concentration-dependent manner as both a network former and a network modifier. At a concentration of 5 wt % CoO, the glass transition point (Tg) of the glass was reduced because of the replacement of stronger Si-O bonds with Co-O bonds in the glass network. Compressive strengths of >2 MPa were measured for Co-containing 1393-derived scaffolds, which are comparable to values of human spongy bone. SBF studies showed that all glass scaffolds form a calcium phosphate (CaP) layer, and for 1393-1Co and 1393-5Co, CaP layers with incorporated traces of Co were observed. The highest Co concentrations of ∼12 ppm were released in SBF after reaction for 21 days, which are known to be within therapeutic ranges reported for Co(2+) ions.
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Affiliation(s)
- Alexander Hoppe
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg , Cauerstrasse 6, 91058 Erlangen, Germany
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15
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Tsaryk R, Peters K, Unger RE, Feldmann M, Hoffmann B, Heidenau F, Kirkpatrick CJ. Improving cytocompatibility of Co28Cr6Mo by TiO2 coating: gene expression study in human endothelial cells. J R Soc Interface 2013; 10:20130428. [PMID: 23825117 DOI: 10.1098/rsif.2013.0428] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Cobalt-based materials are widely used for coronary stents, as well as bone and joint implants. However, their use is associated with high corrosion incidence. Titanium alloys, by contrast, are more biocompatible owing to the formation of a relatively inactive titanium oxide (TiO2) layer on their surface. This study was aimed at improving Co28Cr6Mo alloy cytocompatibility via sol-gel TiO2 coating to reduce metal corrosion and metal ion release. Owing to their role in inflammation and tissue remodelling around an implant, endothelial cells present a suitable in vitro model for testing the biological response to metallic materials. Primary human endothelial cells seeded on Co28Cr6Mo showed a stress phenotype with numerous F-actin fibres absent on TiO2-coated material. To investigate this effect at the gene expression level, cDNA microarray analysis of in total 1301 genes was performed. Compared with control cells, 247 genes were expressed differentially in the cells grown on Co28Cr6Mo, among them genes involved in proliferation, oxidative stress response and inflammation. TiO2 coating reduced the effects of Co28Cr6Mo on gene expression in endothelial cells, with only 34 genes being differentially expressed. Quantitative real-time polymerase chain reaction and protein analysis confirmed microarray data for selected genes. The effect of TiO2 coating can be, in part, attributed to the reduced release of Co(2+), because addition of CoCl2 resulted in similar cellular responses. TiO2 coating of cobalt-based materials, therefore, could be used in the production of cobalt-based devices for cardiovascular and skeletal applications to reduce the adverse effects of metal corrosion products and to improve the response of endothelial and other cell types.
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Affiliation(s)
- R Tsaryk
- Institute of Pathology, University Medical Center, Johannes Gutenberg University of Mainz, Mainz, Germany.
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Jaal J, Dörr W. Radiation effects on cellularity, proliferation and EGFR expression in mouse bladder urothelium. Radiat Res 2010; 173:479-85. [PMID: 20334520 DOI: 10.1667/rr1759.1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This study was designed to determine changes in cell numbers, proliferation (using Ki-67) and EGFR expression in mouse bladder urothelium during the early and late radiation response. Groups of mice were irradiated with a single dose of 20 Gy and assayed 0-360 days later. Urothelial cells were counted. After immunohistochemistry, the absolute and relative numbers of Ki-67(+) and EGFR(+) cells were analyzed. Radiation exposure resulted in a decrease in total urothelial cell numbers to 49% by day 31, with restoration of cellularity by day 180. In contrast, at day 360, an increase in total cell number (143%) was seen. Slightly increased Ki-67 expression was found at days 120 and 180 after treatment, followed by a pronounced elevation at days 240 and 360. Compared to controls, higher EGFR expression was detected up to day 360 after irradiation. A positive correlation was found between total urothelial cells numbers and Ki-67 as well as EGFR expression. Radiation exposure results in an increased urothelial expression of EGFR that precedes urothelial restoration, indicating a contribution of the EGF/EGFR system to urothelial proliferation and differentiation. Further studies are needed to evaluate the impact of EGFR inhibition on radiation effects in the urinary bladder.
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Affiliation(s)
- Jana Jaal
- Department of Radiotherapy and Oncological Therapy, Clinic of Haematology and Oncology, Tartu University Hospital, Estonia.
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Matsumoto S, Shimizu N, Hanai T, Uemura H, Levin R. Bladder outlet obstruction accelerates bladder carcinogenesis. BJU Int 2008; 103:1436-9. [PMID: 19076130 DOI: 10.1111/j.1464-410x.2008.08261.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To examine the correlation between partial bladder outlet obstruction (PBOO) and bladder carcinogenesis. MATERIALS AND METHODS Female Wistar rats (6 weeks old) were divided into three groups of 10 each: group 1 was exposed to n-butyl-n-butanol nitrosamine (BBN, a carcinogen) in drinking water for 8 weeks; group 2 had PBOO induced surgically after exposure to BBN for 8 weeks; group 3 had a sham operation and the rats drank normal water (control group). After 20 weeks, all of the rats were killed humanely and their bladders analysed. RESULTS There were no significant differences in body weight among the groups. The bladder weight of group 2 was significantly greater than either group 1 or group 3. Histopathologically, bladder smooth muscle hypertrophy was the major cause of the increased bladder weight for group 2. In group 2 there were increases in bladder wall thickness and many nipple-shaped urothelial tumours. Basic fibroblast growth factor and hypoxia-inducible factor-1alpha expression were significantly greater in group 2 than in groups 1 and 3. CONCLUSIONS Exposure of the bladder to carcinogens during bladder hyperplasia and hypertrophy induced by PBOO results in a greater incidence of superficial bladder carcinoma.
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Affiliation(s)
- Seiji Matsumoto
- Urological and Urodynamics Center, Koushinkai Hospital, Osaka, Japan.
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18
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Berger AP, Bartsch G, Deibl M, Alber H, Pachinger O, Fritsche G, Rantner B, Fraedrich G, Pallwein L, Aigner F, Horninger W, Frauscher F. Atherosclerosis as a risk factor for benign prostatic hyperplasia. BJU Int 2006; 98:1038-42. [PMID: 16879445 DOI: 10.1111/j.1464-410x.2006.06400.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To evaluate the relationship between clinical benign prostatic hyperplasia (BPH) and atherosclerosis, using colour Doppler ultrasonography (CDUS) and symptom scores. PATIENTS, SUBJECTS AND METHODS CDUS was used to evaluate prostatic vascularity in four groups of men, comprising young healthy subjects, patients presenting with coronary artery disease (CAD), diabetes mellitus, or peripheral arterial occlusive disease (PAOD). Resistive index (RI) measurements and computer-assisted quantification of colour pixel density (CPD) were used to objectively evaluate perfusion. The International Prostate Symptom Score (IPSS) and the International Index of Erectile Function were used to quantify symptoms. RESULTS In diabetic patients and men with PAOD, perfusion of the transition zone (TZ) of the prostate was significantly lower (P < 0.001) and the RI of the TZ was significantly higher (P < 0.001) than in healthy controls and men with CAD. In diabetics and men with PAOD, the mean prostate volume was greater than in healthy controls and men with CAD. The IPSS in patients with vascular damage (diabetes, PAOD) was significantly worse than in the control group. CONCLUSIONS The significantly lower CPD and higher RI values of the TZ in patients with vascular disease than in healthy subjects support the hypothesis that an age-related impairment of blood supply to the prostate has a key role in the development of BPH.
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Affiliation(s)
- Andreas P Berger
- Department of Urology, Medical University of Innsbruck, Austria.
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Berger AP, Deibl M, Leonhartsberger N, Bektic J, Horninger W, Fritsche G, Steiner H, Pelzer AE, Bartsch G, Frauscher F. Vascular damage as a risk factor for benign prostatic hyperplasia and erectile dysfunction. BJU Int 2005; 96:1073-8. [PMID: 16225531 DOI: 10.1111/j.1464-410x.2005.05777.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To assess benign prostatic hyperplasia (BPH) and erectile dysfunction (ED), both considered to be associated with urogenital ageing, in ageing men in a cross-sectional population study, comparing them with healthy controls by using symptom scores and contrast-enhanced colour Doppler ultrasonography (CDUS). PATIENTS, SUBJECTS AND METHODS Transrectal CDUS and quantitative measurement of colour pixel intensity (CPI) are excellent minimally invasive techniques for assessing normal and pathological blood flow. CDUS was performed using the microbubble-based ultrasound enhancer for evaluating prostate, bladder neck and corpus cavernosum vascularity in young healthy men, men with BPH, and men with severe vascular damage (diabetes mellitus type 2). Resistive index measurements and computer-assisted quantification of CPI were used to objectively evaluate perfusion. The International Prostate Symptom Score (IPSS) and the International Index of Erectile Function (IIEF) were applied to quantify the symptoms. RESULTS In patients with BPH, perfusion of the transition zone (TZ) of the prostate was significantly lower and the resistive index of the TZ significantly higher (both P < 0.001) than in healthy controls. The perfusion patterns of men with BPH and those who also had severe vascular damage (diabetes mellitus type 2) showed that vascularity in the latter group was lower in the prostatic TZ and the corpora cavernosa. In patients with BPH the IPSS, quality-of-life and IIEF scores were significantly worse than in the control group. Men with concomitant atherosclerosis had even worse symptom scores. CONCLUSION These results strongly support the hypothesis that age-related impairment of blood supply to the lower urinary tract is important in the development of BPH and ED. Vascular damage may cause chronic ischaemia and thus be a contributing factor in the pathogenesis of BPH and ED.
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Affiliation(s)
- Andreas P Berger
- Department of Urology, University of Innsbruck, Anichstrasse 35, A-6020 Innsbruck, Austria.
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Berger AP, Deibl M, Halpern EJ, Lechleitner M, Bektic J, Horninger W, Fritsche G, Steiner H, Pelzer A, Bartsch G, Frauscher F. Vascular damage induced by type 2 diabetes mellitus as a risk factor for benign prostatic hyperplasia. Diabetologia 2005; 48:784-9. [PMID: 15756540 DOI: 10.1007/s00125-005-1678-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2004] [Accepted: 11/07/2004] [Indexed: 10/25/2022]
Abstract
AIMS/HYPOTHESIS The aim of this study was to evaluate the relationship between benign prostatic hyperplasia (BPH) and arteriosclerosis shown in a model of type 2 diabetes in a trans-sectional population study using contrast-enhanced colour Doppler ultrasound for exact assessment of prostatic blood flow. METHODS Contrast-enhanced transrectal colour Doppler ultrasound was performed using a microbubble-based ultrasound enhancer SonoVue for evaluating prostate vascularity (transitional zone [TZ] and peripheral zone [PZ]) in diabetic BPH patients, non-diabetic BPH patients and healthy subjects. Computer-assisted quantification of colour pixel intensity (CPI) was used to objectively evaluate the prostate vascularity. Resistive index measurements were obtained in the TZ and the PZ. Findings were compared between these three groups. RESULTS TZ-CPI was significantly lower in diabetic patients than in non-diabetic BPH men (p=0.001), whereas the CPI of the PZ showed no difference between these two groups (p=0.978). TZ-CPI of patients with diabetic and non-diabetic BPH were significantly lower than in controls (p<0.001), but no difference was found between diabetic and healthy patients in the PZ (p=0.022) and borderline significance was seen when comparing patients of the BPH group with the control patients (p=0.019). Resistive index values of the TZ in diabetic patients showed significantly higher values (p<0.001) than the BPH and control groups. CONCLUSIONS/INTERPRETATION The significantly lower CPI and higher resistive index values of the TZ in diabetic patients compared with patients with non-diabetic BPH and healthy subjects indicate considerable vascular damage in the TZ of these patients. Diabetic vascular damage may cause hypoxia and may contribute to the pathogenesis of BPH.
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Affiliation(s)
- A P Berger
- Department of Urology, University of Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria.
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Latunde-Dada GO, Shirali S, McKie AT, Simpson RJ, Peters TJ. Effect of transition metal ions (cobalt and nickel chlorides) on intestinal iron absorption. Eur J Clin Invest 2004; 34:626-30. [PMID: 15379762 DOI: 10.1111/j.1365-2362.2004.01396.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Haem biosynthesis may regulate intestinal iron absorption through changes in cellular levels of delta-aminolaevulinic acid (ALA), haem and perhaps other intermediates. CoCl2 and NiCl2 are activators of haem oxygenase, the rate-limiting enzyme in haem catabolism. Co2+ and Ni2+ may also regulate and increase iron absorption through a mechanism that simulates hypoxic conditions in the tissues. DESIGN We assayed intestinal iron absorption in mice dosed with CoCl2 or NiCl2. The effects of these metal ions on splenic and hepatic levels of ALA synthase and dehydratase as well as urinary levels of ALA and phosphobilinogen were also assayed. RESULTS While Co2+ enhanced iron absorption when administered to mice at doses of 65, 125 and 250 micromoles kg(-1) body weight, Ni2+ was effective only at the highest dose. Ni2+ but not Co2+ at the highest dose reduced urinary ALA in the treated mice. Both metals ions increased splenic expression of haem oxygenase 1 and iron regulated protein 1, proteins involved, respectively, in haem degradation and iron efflux. Co2+ induced erythropoietin expression. CONCLUSIONS The data suggest that while the effect of Ni2+ on iron absorption could be explained by effects on ALA, the effect of Co2+ may not be explained simply by changes in haem metabolism; therefore, effects mediated by alterations of specific haemoproteins by mechanisms that simulate tissue hypoxia could be important.
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