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Pohl C, Kunzmann M, Brandt N, Koppe C, Waletzko-Hellwig J, Bader R, Kalle F, Kersting S, Behrendt D, Schlosser M, Hoene A. Quantitative analysis of trabecular bone tissue cryosections via a fully automated neural network-based approach. PLoS One 2024; 19:e0298830. [PMID: 38625969 PMCID: PMC11020490 DOI: 10.1371/journal.pone.0298830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 01/30/2024] [Indexed: 04/18/2024] Open
Abstract
Cryosectioning is known as a common and well-established histological method, due to its easy accessibility, speed, and cost efficiency. However, the creation of bone cryosections is especially difficult. In this study, a cryosectioning protocol for trabecular bone that offers a relatively cheap and undemanding alternative to paraffin or resin embedded sectioning was developed. Sections are stainable with common histological dying methods while maintaining sufficient quality to answer a variety of scientific questions. Furthermore, this study introduces an automated protocol for analysing such sections, enabling users to rapidly access a wide range of different stainings. Therefore, an automated 'QuPath' neural network-based image analysis protocol for histochemical analysis of trabecular bone samples was established, and compared to other automated approaches as well as manual analysis regarding scattering, quality, and reliability. This highly automated protocol can handle enormous amounts of image data with no significant differences in its results when compared with a manual method. Even though this method was applied specifically for bone tissue, it works for a wide variety of different tissues and scientific questions.
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Affiliation(s)
- Christopher Pohl
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Moritz Kunzmann
- University of Heidelberg, BioQuant Center, Heidelberg, Germany
| | - Nico Brandt
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Charlotte Koppe
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Janine Waletzko-Hellwig
- Department of Oral, Maxillofacial and Plastic Surgery, Rostock University Medical Center, Rostock, Germany
- Department of Orthopaedics, Research Laboratory of Biomechanics and Implant Technology, Rostock University Medical Center, Rostock, Germany
| | - Rainer Bader
- Department of Orthopaedics, Research Laboratory of Biomechanics and Implant Technology, Rostock University Medical Center, Rostock, Germany
| | - Friederike Kalle
- Department of Oto-Rhino-Laryngology, Head and Neck Surgery, Rostock University Medical Center, Rostock, Germany
| | - Stephan Kersting
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Daniel Behrendt
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Michael Schlosser
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Andreas Hoene
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
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Abstract
Collagen is commonly used as a regenerative biomaterial due to its excellent biocompatibility and wide distribution in tissues. Different kinds of hybridization or cross-links are favored to offer improvements to satisfy various needs of biomedical applications. Previous reviews have been made to introduce the sources and structures of collagen. In addition, biological and mechanical properties of collagen-based biomaterials, their modification and application forms, and their interactions with host tissues are pinpointed. However, there is still no review about collagen-based biomaterials for tissue engineering. Therefore, we aim to summarize and discuss the progress of collagen-based materials for tissue regeneration applications in this review. We focus on the utilization of collagen-based biomaterials for bones, cartilages, skin, dental, neuron, cornea, and urological applications and hope these experiences and outcomes can provide inspiration and practical techniques for the future development of collagen-based biomaterials in related application fields. Moreover, future improving directions and challenges for collagen-based biomaterials are proposed as well.
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Affiliation(s)
- Yiyu Wang
- Department of Prosthodontics, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310029, China
| | - Zhengke Wang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
- Department of Hepatobiliary and Pancreatic Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310029, China
| | - Yan Dong
- Department of Prosthodontics, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310029, China
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Li W, Xiong F, Yao C, Zhang T, Zhou L, Zhang Z, Wang Z, Mao Y, Zhou P, Guan J. The impact of Allgower-Donati suture pattern and postoperative sweet foods on wound suture breakage in experimental rats. Heliyon 2023; 9:e13934. [PMID: 36915567 PMCID: PMC10006471 DOI: 10.1016/j.heliyon.2023.e13934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 02/07/2023] [Accepted: 02/15/2023] [Indexed: 02/27/2023] Open
Abstract
Background Wound gnawing and/or scratching in rats often occurs in experimental models, causing suture breakage and wound dehiscence, and consequently affecting experimental results and wasting resources. This study aimed to investigate the impact of the combined postoperative use of the Allgower-Donati (A-D) suture pattern and sweet foods on suture breakage, inflammation, and healing in wounds. Materials and methods Sprague Dawley (SD) rats (n = 48) were treated for linear wounds on the back by four procedures: simple suture, simple suture with postoperative sweet foods, A-D suture, and A-D suture with postoperative sweet foods. Additionally, CD68 immunofluorescence and CD31 immunohistochemistry were used to analyze wound inflammation and vascularization, respectively, on postoperative day 7. Sirius red staining was used to assess collagen deposition on postoperative day 14. Results Gnawing and scratching of wound sutures were significantly reduced in treated rats (P < 0.01). Neovascularization and collagen deposition were significantly increased (P < 0.001), and inflammatory responses were significantly reduced (P < 0.001) in animals receiving AD sutures and postoperative sweet foods. CD31/CD68 analyses showed that A-D suture and postoperative sweet foods regulated wound angiogenesis and attenuated wound inflammation. Conclusions Sweet food provision after A-D suture union surgery could reduce wound gnawing and/or scratching, suture breakage, incisional dehiscence, wound inflammation, and promote wound healing in rats.
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Affiliation(s)
- Weifeng Li
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China.,First Department of Orthopedics, People's Hospital of Lixin County, Bozhou, China.,Anhui Province Key Laboratory of Tissue Transplantation, Bengbu, China
| | - Feng Xiong
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China
| | - Cheng Yao
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China
| | - Tingbao Zhang
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China
| | - Liangshuang Zhou
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China
| | - Zhanyue Zhang
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China.,Anhui Province Key Laboratory of Tissue Transplantation, Bengbu, China
| | - Zhaodong Wang
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China.,Anhui Province Key Laboratory of Tissue Transplantation, Bengbu, China
| | - Yingji Mao
- Anhui Province Key Laboratory of Tissue Transplantation, Bengbu, China
| | - Pinghui Zhou
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China.,Anhui Province Key Laboratory of Tissue Transplantation, Bengbu, China
| | - Jianzhong Guan
- Department of Orthopedics, First Affiliated Hospital, Bengbu Medical College, Bengbu, China.,Anhui Province Key Laboratory of Tissue Transplantation, Bengbu, China
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Influence of Cu 2+ on Osteoclast Formation and Activity In Vitro. Int J Mol Sci 2021; 22:ijms22052451. [PMID: 33671069 PMCID: PMC7957576 DOI: 10.3390/ijms22052451] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 02/24/2021] [Accepted: 02/25/2021] [Indexed: 01/28/2023] Open
Abstract
Background: Copper-containing biomaterials are increasingly applied for bone regeneration due to their pro-angiogenetic, pro-osteogenetic and antimicrobial properties. Therefore, the effect of Cu2+ on osteoclasts, which play a major role in bone remodeling was studied in detail. Methods: Human primary osteoclasts, differentiated from human monocytes were differentiated or cultivated in the presence of Cu2+. Osteoclast formation and activity were analyzed by measurement of osteoclast-specific enzyme activities, gene expression analysis and resorption assays. Furthermore, the glutathione levels of the cells were checked to evaluate oxidative stress induced by Cu2+. Results: Up to 8 µM Cu2+ did not induce cytotoxic effects. Activity of tartrate-resistant acid phosphatase (TRAP) was significantly increased, while other osteoclast specific enzyme activities were not affected. However, gene expression of TRAP was not upregulated. Resorptive activity of osteoclasts towards dentin was not changed in the presence of 8 µM Cu2+ but decreased in the presence of extracellular bone matrix. When Cu2+ was added to mature osteoclasts TRAP activity was not increased and resorption decreased only moderately. The glutathione level of both differentiating and mature osteoclasts was significantly decreased in the presence of Cu2+. Conclusions: Differentiating and mature osteoclasts react differently to Cu2+. High TRAP activities are not necessarily related to high resorption.
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Wang Y, Chu X, Sun Y, Teng P, Xia T, Chen Y. A convenient approach by using poly-(HEMA-co-NIPAM)/Cu 2+ solution sol-gel transition for wound protection and healing. J Biomed Mater Res B Appl Biomater 2021; 109:50-59. [PMID: 32627333 DOI: 10.1002/jbm.b.34679] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 05/31/2020] [Accepted: 06/16/2020] [Indexed: 12/16/2022]
Abstract
Rapid and convenient wound healing is crucial for reducing potential post-traumatic wound complications. In this study, a temperature-sensitive polymer of poly-(HEMA-co-NIPAM) (PHN) was synthesized by free-radical polymerization, in which the solution quickly underwent a sol-gel transition above 29°C, thus responding to a typical body temperature and facilitating wound sealing. PHN solution incorporated with copper ions (PHN-Cu) not only exhibited excellent antibacterial properties, but also expedited wound closure and facilitated tissue angiogenesis. The in vivo and in vitro experiments showed that the PHN-Cu had a higher wound closure rate and demonstrated an ability to promote skin tissue angiogenesis. Such a versatile, convenient aqueous solution could enable nonprofessionals to promptly treat wounds in a short time after injury, thus providing suitable conditions for later treatment, and can be used as a convenient method to clean wounds.
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Affiliation(s)
- Yansong Wang
- Department of Orthopedics, First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
| | - Xin Chu
- Department of Orthopedics, First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
| | - Yu Sun
- Department of Orthopedics, First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
| | - Peng Teng
- Department of Orthopedics, First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
| | - Tianzhi Xia
- Department of Orthopedics, First Affiliated Hospital of Jinzhou Medical University, Jinzhou, China
| | - Yisheng Chen
- Department of Orthopedics, Shanghai General Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
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