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Chen SY, You JW, Cho YC, Huang BH, Kuo HH, Huang J, Hsieh CC, Lan WC, Ou KL. Biomechanical stress distribution of medical inelastic fabrics with different porosity structures. J Mech Behav Biomed Mater 2023; 147:106105. [PMID: 37716207 DOI: 10.1016/j.jmbbm.2023.106105] [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: 05/23/2023] [Revised: 08/31/2023] [Accepted: 09/03/2023] [Indexed: 09/18/2023]
Abstract
Clothing fit and pressure comfort play important role in clothing comfort, especially in medical body sculpting clothing (MBSC). In the present study, different body movements (forward bending, side bending, and twisting) were adopted to simulate and investigate the biomechanical stress distribution of the human body with three kinds of porosity inelastic MBSCs through the finite element analysis method. The elastic modulus of the investigated MBSCs was also measured by means of tensile testing. Analytical results showed that in the compression region during body movements, the investigated inelastic MBSCs endured less compression stress, and most of the stress was transmitted to the human body. Moreover, the stresses on the body surface were decreased with the porosity increasing. However, most of the von Mises stresses on the human body were in the desired pressure comfort range. Therefore, these results could provide potential information in the modification of MBSC for medical applications.
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Affiliation(s)
- Shyuan-Yow Chen
- Department of Dentistry, Cathay General Hospital, Taipei, 106, Taiwan
| | - Jia-Wei You
- Division of Family and Operative Dentistry, Department of Dentistry, Taipei Medical University Hospital, Taipei, 110, Taiwan
| | - Yung-Chieh Cho
- School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, 110, Taiwan
| | - Bai-Hung Huang
- Graduate Institute of Dental Science, College of Dentistry, China Medical University, Taichung, 404, Taiwan
| | - Hsin-Hui Kuo
- Research Center for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei, 110, Taiwan
| | | | - Chia-Chien Hsieh
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei, 110, Taiwan
| | - Wen-Chien Lan
- Department of Oral Hygiene Care, Ching Kuo Institute of Management and Health, Keelung, 203, Taiwan.
| | - Keng-Liang Ou
- Department of Dentistry, Taipei Medical University-Shuang Ho Hospital, New Taipei City, 235, Taiwan; 3D Global Biotech Inc. (Spin-off Company from Taipei Medical University), New Taipei City, 221, Taiwan.
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Simon D, Kleyer A, Bayat S, Knitza J, Valor-Mendez L, Schweiger M, Schett G, Tascilar K, Hueber AJ. Biomechanical stress in the context of competitive sports training triggers enthesitis. Arthritis Res Ther 2021; 23:172. [PMID: 34154651 PMCID: PMC8215784 DOI: 10.1186/s13075-021-02530-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 04/05/2021] [Accepted: 05/11/2021] [Indexed: 01/22/2023] Open
Abstract
OBJECTIVE To evaluate the influence of mechanical stress on the development of immediate enthesitis. METHODS The BEAT study is an interventional study that assessed entheses in competitive badminton players before and immediately after a 60-min intensive training session. Power Doppler (PD) signal and Gray scale (GS) changes were assessed in the insertion sites of both Achilles tendon, patellar tendons, and lateral humeral epicondyles and quantified using a validated scoring system. RESULTS Thirty-two badminton players were included. One hundred ninety-two entheseal sites were examined twice. The respective empirical total scores for PD examination were 0.1 (0.3) before and 0.5 (0.9) after training. Mean total GS scores were 2.9 (2.5) and 3.1 (2.5) before and after training, respectively. The mean total PD score difference of 0.4 between pre- and post-training was significant (p = 0.0014), whereas no significant difference for the mean total GS score was observed. Overall, seven participants (22%) showed an increased empirical total PD score. A mixed effects model showed a significant increase of PD scores after training, with a mean increase per site of 0.06 (95% CI 0.01 to 0.12, p = 0.017). CONCLUSIONS Mechanical stress leads to rapid inflammatory responses in the entheseal structures of humans. These data support the concept of mechanoinflammation in diseases associated with enthesitis.
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Affiliation(s)
- David Simon
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany. .,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany. .,Rheumazentrum Erlangen, 91054, Erlangen, Germany.
| | - Arnd Kleyer
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Rheumazentrum Erlangen, 91054, Erlangen, Germany
| | - Sara Bayat
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Rheumazentrum Erlangen, 91054, Erlangen, Germany
| | - Johannes Knitza
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Rheumazentrum Erlangen, 91054, Erlangen, Germany
| | - Larissa Valor-Mendez
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Rheumazentrum Erlangen, 91054, Erlangen, Germany
| | - Marina Schweiger
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Rheumazentrum Erlangen, 91054, Erlangen, Germany
| | - Georg Schett
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Rheumazentrum Erlangen, 91054, Erlangen, Germany
| | - Koray Tascilar
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.,Rheumazentrum Erlangen, 91054, Erlangen, Germany
| | - Axel J Hueber
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany. .,Deutsches Zentrum Immuntherapie, Friedrich-Alexander University (FAU) Erlangen-Nürnberg and Universitätsklinikum Erlangen, 91054, Erlangen, Germany. .,Rheumazentrum Erlangen, 91054, Erlangen, Germany. .,Section Rheumatology, Sozialstiftung Bamberg, 96049, Bamberg, Germany.
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Kasahara Y, Takamizawa T, Hirokane E, Tsujimoto A, Ishii R, Barkmeier WW, Latta MA, Miyazaki M. Comparison of different etch-and-rinse adhesive systems based on shear fatigue dentin bond strength and morphological features the interface. Dent Mater 2020; 37:e109-e117. [PMID: 33248806 DOI: 10.1016/j.dental.2020.11.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 04/17/2020] [Revised: 07/13/2020] [Accepted: 11/02/2020] [Indexed: 10/22/2022]
Abstract
OBJECTIVES The aim of this study was to investigate dentin bonding durability of different etch-and-rinse (ER) adhesive systems under fatigue stress and to compare morphological features of resin/dentin interfaces using SEM. METHODS Two three-step ER adhesives, a two-step ER adhesive, and a universal adhesive in ER mode were evaluated. Before application of either primer or adhesive, phosphoric acid etching of human dentin was completed. Fifteen bonded specimens for each adhesive system were stored in distilled water at 37 °C for 24 h, then subjected to a shear bond strength (SBS) test. Bonding durability was assessed from the perspective of biomechanical stress. 25 bonded specimens for each adhesive system were subjected to shear fatigue strength (SFS) testing with a repeated subcritical load at a frequency of 20 Hz for 50,000 cycles or until failure. RESULTS Mean SBS and SFS values ranged from 33.3 to 41.2 MPa, and from 18.3 to 20.3 MPa, respectively. Three-step adhesives showed higher SBS and SFS values than the other adhesive systems. Under SEM, resin tags in different adhesive systems showed similar features, but morphology below the hybrid layer was material dependent. The universal adhesive in ER mode showed an obvious thin, high-density reaction layer below the hybrid layer. SIGNIFICANCE Three-step adhesives showed higher dentin bond durability than the other ER adhesives; no significant differences in SFS were found between the universal adhesive in ER mode and the three-step ER adhesives. The results of this in vitro study indicate that some ER adhesives might establish chemical bonding with intact dentin below the hybrid layer in addition to micromechanical retention.
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Affiliation(s)
- Yuta Kasahara
- Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
| | - Toshiki Takamizawa
- Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan.
| | - Eizo Hirokane
- Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
| | - Akimasa Tsujimoto
- Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
| | - Ryo Ishii
- Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
| | - Wayne W Barkmeier
- Department of General Dentistry, Creighton University School of Dentistry, Omaha, Nebraska, USA
| | - Mark A Latta
- Department of General Dentistry, Creighton University School of Dentistry, Omaha, Nebraska, USA
| | - Masashi Miyazaki
- Department of Operative Dentistry, Nihon University School of Dentistry, Tokyo, Japan
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Wu XS, Wang F, Li A, Wang SL. [The pattern and regulatory mechanism of mammalian diphyodont tooth replacement]. Zhonghua Kou Qiang Yi Xue Za Zhi 2020; 55:367-372. [PMID: 32486564 DOI: 10.3760/cma.j.cn112144-20200311-00144] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Although the dental lamina of permanent teeth in human being has been developed as early as the embryo stage, the replacement of the deciduous teeth by permanent teeth does not take place untill the age of 6 to 12 years old. The molecular mechanism of the initiation of permanent teeth is still unclear. The rodent species are usually used for the tooth development research in the past. However, this animal model is not suitable for the tooth replacement study because of the absence of tooth replacement in rodents. After 10 years of efforts, our team has established the animal model of miniature pig for tooth replacement research. Using this model, we firstly defined the spatiotemporal pattern of teeth replacement. In the further mechanism research, results showed that the growing rate of the deciduous teeth was faster than that of the surrounding alveolar bone, and biomechanical stress inside mandible was generated due to the fast growth of deciduous teeth. The stress might up-regulate the signal of Runt-related transcription factor 2 (RUNX2)-Wnt pathway in the mesenchyme between the deciduous and permanent teeth, sustain the successional dental lamina at the resting stage and inhibit the development of permanent teeth. A similar expression pattern was also found in the mesenchyme between the deciduous and permanent teeth in human. Our findings demonstrated that the eruption of deciduous tooth released the stress inside mandible, thus induced the "Wnt translocation" from the mesenchyme into the epithelium of permanent counterpart and therefore initiated the development of permanent teeth. The underlying mechanism of the replacement of deciduous teeth by permanent teeth is the regulation of biomechanical stress throughout the initiation process. Based on the findings, we proposed the theory of "biomechanical stress regulation of the tooth replacement" . The replacement pattern and regulatory mechanism provide a scientific foundation for the organ development and regeneration by regulating the biomechanical stress and Wnt pathway in the future.
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Affiliation(s)
- X S Wu
- Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing 100050, China(Wu Xiaoshan is working on the Department of Oral and Maxillofacial Surgery, Center of Stomatology, Xiangya Hospital, Central South University, Changsha 410008, China)
| | - F Wang
- Department of Oral and Maxillofacial Surgery, School of Stomatology, Dalian Medical University, Dalian 116044, China
| | - A Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710004, China
| | - S L Wang
- Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing 100050, China
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Yang G, Li F, Lu J, Niu Y, Dai Y, Zuo L, Tian G, Wang F. The dysplastic trochlear sulcus due to the insufficient patellar stress in growing rats. BMC Musculoskelet Disord 2019; 20:411. [PMID: 31488123 PMCID: PMC6729031 DOI: 10.1186/s12891-019-2802-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 08/29/2019] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Developmental factors were assumed to be the key factors that influenced the morphology of femoral trochlea. This study investigated the effects of insufficient patellar stress after birth on the morphological development of the femoral trochlea. Effects of insufficient patellar stress on femoral trochlea were investigated using surgical induced patellectomy and patellar dislocation in growing rat model. METHODS In this study, two experimental groups and one sham group (SG) were established. Thirty-six Wistar rats (female, 28 days of age) were randomly assigned to three groups. The patellectomy group (PG), rats underwent the patellectomy in this group. The dislocation group (DG), rats underwent the surgery-induced patellar dislocation. Histological staining (Safranin-O and fast green), Micro-computed tomographic (Micro-CT) analysis in two experimental endpoints (3, 12 weeks postoperatively) were selected to evaluate morphological changes of the femoral trochlea. RESULTS Articular cartilage on the trochlear sulcus was remodeled at 3 weeks after the surgery, and degenerated at 12 weeks through the histological staining. The femoral trochlear angle (FTA) did not show a significant difference at 3 week between the experimental groups and the sham group (PG vs SG P = 0.38, DG vs SG p = 0.05), but the FTA was significantly increased in experimental groups at 12 weeks(PG vs SG P = 0.001, DG vs SG p = 0.005). The Bone volume density (BV/TV), Trabecular number (Tb.N) under the trochlea groove were significantly reduced at 3 weeks postoperatively in the experimental groups (PG vs SG p = 0.001, DG vs SG p = 0.002). No significant difference was found in BV/TV and Tb. N among the three groups at 12 weeks postoperatively. CONCLUSION Surgical induced patellectomy and patellar dislocation leads to the dysplastic trochlear sulcus in growing rats. Besides the bone morphology of trochlear sulcus, the articular cartilage and subchondral trabecula under the trochlear sulcus were remodeled early stage after the surgery.
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Affiliation(s)
- Guangmin Yang
- Department of joint surgery, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, Hebei, China
| | - Faquan Li
- Department of joint surgery, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, Hebei, China
| | - Jiangfeng Lu
- Department of joint surgery, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, Hebei, China
| | - Yingzhen Niu
- Department of joint surgery, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, Hebei, China
| | - Yike Dai
- Department of joint surgery, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, Hebei, China
| | - Lixiong Zuo
- Department of joint surgery, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, Hebei, China
| | - Gengshuang Tian
- Department of joint surgery, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, Hebei, China
| | - Fei Wang
- Department of joint surgery, Third Hospital of Hebei Medical University, Shijiazhuang, 050051, Hebei, China.
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Shabestari M, Kise NJ, Landin MA, Sesseng S, Hellund JC, Reseland JE, Eriksen EF, Haugen IK. Enhanced angiogenesis and increased bone turnover characterize bone marrow lesions in osteoarthritis at the base of the thumb. Bone Joint Res 2018; 7:406-413. [PMID: 30034794 PMCID: PMC6035357 DOI: 10.1302/2046-3758.76.bjr-2017-0083.r3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Objectives Little is known about tissue changes underlying bone marrow lesions (BMLs) in non-weight-bearing joints with osteoarthritis (OA). Our aim was to characterize BMLs in OA of the hand using dynamic histomorphometry. We therefore quantified bone turnover and angiogenesis in subchondral bone at the base of the thumb, and compared the findings with control bone from hip OA. Methods Patients with OA at the base of the thumb, or the hip, underwent preoperative MRI to assess BMLs, and tetracycline labelling to determine bone turnover. Three groups were compared: trapezium bones removed by trapeziectomy from patients with thumb base OA (n = 20); femoral heads with (n = 24); and those without (n = 9) BMLs obtained from patients with hip OA who underwent total hip arthroplasty. Results All trapezium bones demonstrated MRI-defined BMLs. Compared with femoral heads without BMLs, the trapezia demonstrated significantly higher bone turnover (mean sd 0.2 (0.1) versus 0.01 (0.01) µm3/µm2/day), mineralizing surface (18.5% (13.1) versus 1.4% (1.3)) and vascularity (5.2% (1.1) versus 1.2% (0.6)). Femoral heads with BMLs exhibited higher bone turnover (0.3 (0.2) versus 0.2 (0.1) µm3/µm2/day), a higher mineralization rate (26.6% (10.6) versus 18.6% (11.9)) and greater trabecular thickness (301.3 µm (108) versus 163.6 µm (24.8)) than the trapezia. Conclusion Bone turnover and angiogenesis were enhanced in BMLs of both the thumb base and hip OA, of which the latter exhibited the highest bone turnover. Thus, the increase in bone turnover in weight-bearing joints like the hip may be more pronounced than less mechanically loaded osteoarthritic joints demonstrating BMLs. The histological changes observed may explain the water signal from BMLs on MRI.Cite this article: M. Shabestari, N. J. Kise, M. A. Landin, S. Sesseng, J. C. Hellund, J. E. Reseland, E. F. Eriksen, I. K. Haugen. Enhanced angiogenesis and increased bone turnover characterize bone marrow lesions in osteoarthritis at the base of the thumb. Bone Joint Res 2018;7:406-413. DOI: 10.1302/2046-3758.76.BJR-2017-0083.R3.
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Affiliation(s)
- M Shabestari
- Department of Biomaterials, Faculty of Dentistry, Institute of Clinical Dentistry, University of Oslo, Oslo, Norway
| | - N J Kise
- Department of Orthopaedic Surgery, Martina Hansens Hospital, Akershus, Norway
| | - M A Landin
- Department of Oral Biology, Faculty of Dentistry University of Oslo, Oslo, Norway
| | - S Sesseng
- Department of Radiology,Diakonhjemmet Hospital, Oslo, Norway
| | - J C Hellund
- Department of Radiology and Nuclear Medicine, Oslo University Hospital, Ullevål, Oslo, Norway
| | - J E Reseland
- Department of Biomaterials, Faculty of Dentistry University of Oslo, Oslo, Norway
| | - E F Eriksen
- Department of Endocrinology, Oslo University Hospital, Ullevål, Oslo, Norway and Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - I K Haugen
- Department of Rheumatology, Diakonhjemmet Hospital, Oslo, Norway
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Zhang X, Di G, Dong M, Qu M, Zhao X, Duan H, Hu X, Liu T, Zhou Q, Shi W. Epithelium-derived miR-204 inhibits corneal neovascularization. Exp Eye Res 2017; 167:122-127. [PMID: 29246498 DOI: 10.1016/j.exer.2017.12.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [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: 09/01/2017] [Revised: 12/05/2017] [Accepted: 12/10/2017] [Indexed: 11/28/2022]
Abstract
MicroRNA-204 (miR-204) is highly expressed in cornea, here we explored the role and mechanism of miR-204 in corneal neovascularization (CNV). Mouse CNV was induced by intrastromal placement of suture in BALB/c mice with the subconjunctival injection of miR-204 agomir or negative control. Human primary limbal epithelial cells (LECs) and immortalized microvascular endothelial cells (HMECs) were used to evaluate the expression changes and anti-angiogenic effects of miR-204 under biomechanical stress (BS). The expression and localization of miR-204, vascular endothelial growth factor (VEGF) and their receptors were detected by quantitative real-time PCR, in situ hybridization, immunohistochemistry and Western blot. The results showed that miR-204 expression was mainly localized in epithelium and down-expressed in vascularized cornea. Subconjunctival injection of miR-204 agomir inhibited CNV and reduced the expression of VEGF and VEGF receptor 2. Similarly, miR-204 overexpression attenuated the increased expression of VEGF by biomechanical stress in LECs, and suppressed the proliferation, migration, and tube formation of HMECs. These novel findings indicate that epithelium-derived miR-204 inhibits suture-induced CNV through regulating VEGF and VEGF receptor 2.
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Affiliation(s)
- Xiaoping Zhang
- The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China; Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China
| | - Guohu Di
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China
| | - Muchen Dong
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China; School of Medicine and Life Sciences, University of Jinan-Shandong Academy of Medical Sciences, Jinan, Shandong, China
| | - Mingli Qu
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China
| | - Xiaowen Zhao
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China
| | - Haoyun Duan
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China
| | - Xiaoli Hu
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China
| | - Ting Liu
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China
| | - Qingjun Zhou
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China.
| | - Weiyun Shi
- Shandong Provincial Key Laboratory of Ophthalmology, Shandong Eye Institute, Shandong Academy of Medical Sciences, Qingdao, Shandong, China.
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Rangrez AY, Pott J, Kluge A, Frauen R, Stiebeling K, Hoppe P, Sossalla S, Frey N, Frank D. Myeloid leukemia factor-1 is a novel modulator of neonatal rat cardiomyocyte proliferation. Biochim Biophys Acta Mol Cell Res 2017; 1864:634-644. [PMID: 28087342 DOI: 10.1016/j.bbamcr.2017.01.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 01/03/2017] [Accepted: 01/06/2017] [Indexed: 10/20/2022]
Abstract
The present study focuses on the identification of the gene expression profile of neonatal rat cardiomyocytes (NRVCMs) after dynamic mechanical stretch through microarrays of RNA isolated from cells stretched for 2, 6 or 24h. In this analysis, myeloid leukemia factor-1 (MLF1) was found to be significantly downregulated during the course of stretch. We found that MLF1 is highly expressed in the heart, however, its cardiac function is unknown yet. In line with microarray data, MLF1 was profoundly downregulated in in vivo mouse models of cardiomyopathy, and also significantly reduced in the hearts of human patients with dilated cardiomyopathy. Our data indicates that the overexpression of MLF1 in NRVCMs inhibited cell proliferation while augmenting apoptosis. Conversely, knockdown of MLF1 protected NRVCMs from apoptosis and promoted cell proliferation. Moreover, we found that knockdown of MLF1 protected NRVCMs from hypoxia-induced cell death. The observed accelerated apoptosis is attributed to the activation of caspase-3/-7/PARP-dependent apoptotic signaling and upregulation of p53. Most interestingly, MLF1 knockdown significantly upregulated the expression of D cyclins suggesting its possible role in cyclin-dependent cell proliferation. Taken together, we, for the first time, identified an important role for MLF1 in NRVCM proliferation.
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Affiliation(s)
- Ashraf Yusuf Rangrez
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, 24105 Kiel, Germany; DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, 24105 Kiel, Germany
| | - Jost Pott
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, 24105 Kiel, Germany
| | - Annika Kluge
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, 24105 Kiel, Germany
| | - Robert Frauen
- University Medical Center Eppendorf, 20246 Hamburg, Germany
| | - Katharina Stiebeling
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, 24105 Kiel, Germany
| | - Phillip Hoppe
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, 24105 Kiel, Germany
| | - Samuel Sossalla
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, 24105 Kiel, Germany; DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, 24105 Kiel, Germany
| | - Norbert Frey
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, 24105 Kiel, Germany; DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, 24105 Kiel, Germany
| | - Derk Frank
- Department of Internal Medicine III (Cardiology, Angiology, Intensive Care), University Medical Center Kiel, 24105 Kiel, Germany; DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, 24105 Kiel, Germany.
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Chorro FJ, Canto ID, Brines L, Such-Miquel L, Calvo C, Soler C, Zarzoso M, Trapero I, Tormos Á, Such L. Experimental Study of the Effects of EIPA, Losartan, and BQ-123 on Electrophysiological Changes Induced by Myocardial Stretch. ACTA ACUST UNITED AC 2015; 68:1101-10. [PMID: 25985899 DOI: 10.1016/j.rec.2014.12.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 09/08/2014] [Accepted: 12/12/2014] [Indexed: 11/26/2022]
Abstract
INTRODUCTION AND OBJECTIVES Mechanical response to myocardial stretch has been explained by various mechanisms, which include Na(+)/H(+) exchanger activation by autocrine-paracrine system activity. Drug-induced changes were analyzed to investigate the role of these mechanisms in the electrophysiological responses to acute myocardial stretch. METHODS Multiple epicardial electrodes and mapping techniques were used to analyze changes in ventricular fibrillation induced by acute myocardial stretch in isolated perfused rabbit hearts. Four series were studied: control (n = 9); during perfusion with the angiotensin receptor blocker losartan (1 μM, n = 8); during perfusion with the endothelin A receptor blocker BQ-123 (0.1 μM, n = 9), and during perfusion with the Na(+)/H(+) exchanger inhibitor EIPA (5-[N-ethyl-N-isopropyl]-amiloride) (1 μM, n = 9). RESULTS EIPA attenuated the increase in the dominant frequency of stretch-induced fibrillation (control=40.4%; losartan=36% [not significant]; BQ-123=46% [not significant]; and EIPA=22% [P<.001]). During stretch, the activation maps were less complex (P<.0001) and the spectral concentration of the arrhythmia was greater (greater regularity) in the EIPA series: control=18 (3%); EIPA = 26 (9%) (P < .02); losartan=18 (5%) (not significant); and BQ-123=18 (4%) (not significant). CONCLUSIONS The Na(+)/H(+) exchanger inhibitor EIPA attenuated the electrophysiological effects responsible for the acceleration and increased complexity of ventricular fibrillation induced by acute myocardial stretch. The angiotensin II receptor antagonist losartan and the endothelin A receptor blocker BQ-123 did not modify these effects.
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Affiliation(s)
- Francisco J Chorro
- Servicio de Cardiología, Hospital Clínico Universitario de Valencia, INCLIVA, Valencia, Spain; Departamento de Medicina, Universidad de Valencia-Estudi General, Valencia, Spain.
| | - Irene Del Canto
- Departamento de Medicina, Universidad de Valencia-Estudi General, Valencia, Spain
| | - Laia Brines
- Departamento de Fisiología, Universidad de Valencia-Estudi General, Valencia, Spain
| | - Luis Such-Miquel
- Departamento de Fisioterapia, Universidad de Valencia-Estudi General, Valencia, Spain
| | - Conrado Calvo
- Departamento de Electrónica, Universidad Politécnica de Valencia, Valencia, Spain
| | - Carlos Soler
- Departamento de Fisiología, Universidad de Valencia-Estudi General, Valencia, Spain
| | - Manuel Zarzoso
- Departamento de Fisioterapia, Universidad de Valencia-Estudi General, Valencia, Spain
| | - Isabel Trapero
- Departamento de Enfermería, Universidad de Valencia-Estudi General, Valencia, Spain
| | - Álvaro Tormos
- Departamento de Electrónica, Universidad Politécnica de Valencia, Valencia, Spain
| | - Luis Such
- Departamento de Fisiología, Universidad de Valencia-Estudi General, Valencia, Spain
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Steinhilber B, Seibt R, Reiff F, Rieger MA, Kraemer B, Rothmund R. Effect of a laparoscopic instrument with rotatable handle piece on biomechanical stress during laparoscopic procedures. Surg Endosc 2015; 30:78-88. [PMID: 25829062 DOI: 10.1007/s00464-015-4164-3] [Citation(s) in RCA: 8] [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: 11/22/2014] [Accepted: 03/09/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To investigate the effect of a pistol grip laparoscopic instrument with a rotatable handle piece (rot-HP) on biomechanical stress and precision as well as a possible interaction between the instrument and working height (WH). BACKGROUND Biomechanical stress induced by laparoscopic surgery (LS) is associated with work-related upper limb musculoskeletal disorders in surgeons. Ergonomic handle designs of laparoscopic instruments may reduce the risk of musculoskeletal disorders. METHODS Without LS experience, 57 healthy subjects (30 women; 27 men, median age: 26) were observed while performing a laparoscopic exercise. Subjects had to pick up coloured pins and place them into a colour-coded wooden set-up inside a pelvitrainer. The exercise was performed at two WHs using the rot-HP and a standard laparoscopic (fixed) handle piece in randomized sequence. Biomechanical stress was monitored via surface electromyography (sEMG) on fife muscles from the upper limb and shoulder region. Further, the wrist angle (palmar and dorsi flexion) and posture of the dominant upper arm were recorded. Precision was assessed using the number of validly placed pins and process time. RESULTS sEMG parameters and upper arm postures indicated no differences in biomechanical stress related to either laparoscopic handle piece. The higher WH was associated with higher trapezius and deltoid activity and elevated arm postures (p < 0.05). Neutral wrist positions were more frequent using the rot-HP, and the lower WH resulted in slightly more neutral wrist positions. Precision was similar during all experimental conditions. CONCLUSIONS The rot-HP did not decrease biomechanical stress in the shoulder or lower arm muscles. However, wrist angle position may be optimized without affecting precision. Long-term effects of the rot-HP on preventing complaints of the upper extremity should be evaluated. Low WH is recommended to reduce biomechanical stress in the shoulder during laparoscopic surgery.
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Affiliation(s)
- Benjamin Steinhilber
- Institute of Occupational and Social Medicine and Health Services Research, University Hospital Tuebingen, Wilhelmstrasse 27, 72074, Tuebingen, Germany.
| | - Robert Seibt
- Institute of Occupational and Social Medicine and Health Services Research, University Hospital Tuebingen, Wilhelmstrasse 27, 72074, Tuebingen, Germany
| | - Florian Reiff
- Institute of Occupational and Social Medicine and Health Services Research, University Hospital Tuebingen, Wilhelmstrasse 27, 72074, Tuebingen, Germany
| | - Monika A Rieger
- Institute of Occupational and Social Medicine and Health Services Research, University Hospital Tuebingen, Wilhelmstrasse 27, 72074, Tuebingen, Germany
| | - Bernhard Kraemer
- Department of Gyneacological and Obstetrics, University Hospital Tuebingen, Tuebingen, Germany
| | - Ralf Rothmund
- Department of Gyneacological and Obstetrics, University Hospital Tuebingen, Tuebingen, Germany
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11
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Bairdain S, Ricca R, Riehle K, Zurakowski D, Saites CG, Lien C, Anderson GF, Wahoff DC, Linden BC. Early results of an objective feedback-directed system for the staged traction repair of long-gap esophageal atresia. J Pediatr Surg 2013; 48:2027-31. [PMID: 24094952 DOI: 10.1016/j.jpedsurg.2013.05.008] [Citation(s) in RCA: 5] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 05/03/2013] [Accepted: 05/07/2013] [Indexed: 10/26/2022]
Abstract
PURPOSE Treatment of long-gap esophageal atresia challenges pediatric surgeons. Dr. Foker described utilization of external traction sutures to promote in-vivo growth through tension-induced lengthening, but reproducibility of this technique is difficult. We describe a safe and reproducible traction system using transduction of hydrostatic pressure as a surrogate for tension. METHODS We conducted a multi-institutional review of patients treated with this system from 2005 to 2012. All children had sutures applied to both pouches with continuous measurement of associated hydrostatic pressures (tension). Main outcome measures were days to delayed primary repair and thoracotomies prior to primary repair. RESULTS Seven children were included. Median time to delayed repair was 15 days (range: 6-47 days). Three patients required repeat thoracotomies owing to mechanical entrapment of a pouch, all identified early by this system. All required postoperative dilations. Three had self-limited postdilation leaks, and there was one operation-related leak. CONCLUSIONS This system provides reproducible traction application, facilitating staged primary repair by preventing major failures through limiting excessive traction and guides re-exploration for trapped segments. Larger studies are needed to determine the optimal tension protocol, prevent postoperative leaks, while decreasing the need for dilations and time to enteral feeding.
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Affiliation(s)
- Sigrid Bairdain
- Department of Pediatric Surgery, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
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