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Rat achilles tendon

Siwei Chen, Ganming Deng, Kaiqun Li, Haonan Zheng, Gang Wang, Bin Yu, Kairui Zhang
BACKGROUND Previous studies demonstrated that tendon-derived stem cells (TDSCs) were vital healing cells and that mRNA expression of anti-inflammatory cytokine IL-6 was significantly upregulated in injured tendons. The aim of the present study was to investigate the effects of IL-6 on the TDSCs in vitro. MATERIAL AND METHODS TDSCs isolated from the Achilles tendons in SD rats were co-cultured with various concentrations of IL-6. Cell proliferation, cell cycle analysis, quantitative real-time PCR, western blotting analysis, and statistical analysis were used in the study...
March 16, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Chandong Jeong, Sung Eun Kim, Kyu-Sik Shim, Hak-Jun Kim, Mi Hyun Song, Kyeongsoon Park, Hae-Ryong Song
Tendon rupture induces an inflammatory response characterized by release of pro-inflammatory cytokines and impaired tendon performance. This study sought to investigate the therapeutic effects of simvastatin-loaded porous microspheres (SIM/PMSs) on inflamed tenocytes in vitro and collagenase-induced Achilles tendinitis in vivo. The treatment of SIM/PMSs in lipopolysaccharide (LPS)-treated tenocytes reduced the mRNA expressions of pro-inflammatory cytokines (Matrix metalloproteinase-3 ( MMP-3 ), cyclooxygenase-2 ( COX-2 ), interleukin-6 ( IL-6 ), and tumor necrosis factor-α ( TNF-α ))...
March 12, 2018: International Journal of Molecular Sciences
Alper Çıraklı, Pınar Naile Gürgör, Erdal Uzun, Havva Erdem, Soner Çankaya, Orhan Baş
OBJECTIVES: This study aims to evaluate the potential adverse effects of tranexamic acid (TA) on tendon healing. MATERIALS AND METHODS: Twelve male Wistar-Albino rats (weighing 300 g to 350 g) were used in the study. Rats were divided into two groups. Right legs of the rats were determined as the TA group and left legs as the serum physiologic (SP) group. Bilateral Achilles tenotomy was performed and surgically repaired. For the right side, 1 mL of TA and for the left side, 1 mL of SP were applied...
April 2018: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
Yılmaz Eren, Oktay Adanır, Yaşar Mahsut Dinçel, Erdinç Genç, Yunus Ziya Arslan, Aysel Çağlar
OBJECTIVES: This study aims to compare the histopathological and biomechanical effects of low molecular weight heparin (LMWH) and rivaroxaban, which are frequently used in orthopedic surgery for thromboembolic prophylaxis, on rat Achilles tendon healing. MATERIALS AND METHODS: In the study, 36 adult, male Sprague Dawley rats weighing between 300 g and 400 g were used. Three groups were formed including 12 rats in each. Achilles tendons of all rats were cut and repaired...
April 2018: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
Sebastian A Müller, Christopher H Evans, Patricia E Heisterbach, Martin Majewski
BACKGROUND: The role of the paratenon in tendon healing is unknown. The present study compares healing in the presence or absence of the paratenon in an Achilles tendon defect model in rats. HYPOTHESIS: Resection of the paratenon impairs tendon healing. STUDY DESIGN: Controlled laboratory study. METHODS: Sixty skeletally mature Sprague Dawley rats were randomly assigned to either a resected paratenon (RP) group or an intact paratenon (IP) group...
March 1, 2018: American Journal of Sports Medicine
Geir Aasmund Hjorthaug, Endre Søreide, Lars Nordsletten, Jan Erik Madsen, Finn P Reinholt, Sanyalak Niratisairak, Sigbjørn Dimmen
Background and purpose - Outcome after ligament reconstruction or tendon repair depends on secure tendon-to-bone healing. Increased osteoclastic activity resulting in local bone loss may contribute to delayed healing of the tendon-bone interface. The objective of this study was to evaluate the effect of the bisphosphonate zoledronic acid (ZA) on tendon-to-bone healing. Methods - Wistar rats (n = 92) had their right Achilles tendon cut proximally, pulled through a bone tunnel in the distal tibia and sutured anteriorly...
March 1, 2018: Acta Orthopaedica
Erdinç Genç, Ozan Beytemur, Serdar Yuksel, Yılmaz Eren, Aysel Çağlar, Bedri Onur Küçükyıldırım, Mehmet Akif Güleç
OBJECTIVE: The aim of this study to evaluate the effects of autologous conditioned serum (ACS) on the healing of transected rat Achilles tendons via the assessment of biomechanical and histological parameters. METHODS: The study was conducted on 45 male Sprague-Dawley rats. Five rats were used as donors for ACS preparation. Animals were randomly assigned to the experimental or control group. In both groups, the Achilles tendon was cut transversally and then sutured...
February 14, 2018: Acta Orthopaedica et Traumatologica Turcica
Rene B Svensson, Stuart T Smith, Patrick J Moyer, S Peter Magnusson
Connective tissues are ubiquitous throughout the body and consequently affect the function of many organs. In load bearing connective tissues like tendon, the mechanical functionality is provided almost exclusively by collagen fibrils that in turn are stabilized by covalent cross-links. Functionally distinct tendons display different cross-link patterns, which also change with maturation, but these differences have not been studied in detail at the fibril level. In the present study, a custom built nanomechanical test platform was designed and fabricated to measure tensile mechanics of individual fibrils from rat tendons...
February 12, 2018: Acta Biomaterialia
Jie Sun, Chenchen Mou, Qin Shi, Bing Chen, Xianglin Hou, Wen Zhang, Xiaoran Li, Yan Zhuang, Jiajia Shi, Yanyan Chen, Jianwu Dai
It had been demonstrated that stromal cell-derived factor-1α (SDF-1α) could promote in situ tendon regeneration by recruiting endogenous cells. However, native SDF-1α diffuses too fast in vivo, reducing its local concentration and efficacy. In this study, we prepared a recombinant SDF-1α containing a collagen-binding domain (CBD-SDF-1α) and developed a functional collagen scaffold by tethering CBD-SDF-1α on the collagen scaffold for in situ tendon regeneration. CBD-SDF-1α could induce the migration of mesenchymal stem cells, dermal fibroblasts and Achilles tendon fibroblasts in vitro, and achieve controlled release from the collagen scaffold...
February 4, 2018: Biomaterials
Emily C Vafek, Johannes F Plate, Eric Friedman, Sandeep Mannava, Aaron T Scott, Kerry A Danelson
Background: Achilles tendon (AT) ruptures are common in the middle age population; however, the pathophysiology and influence of age on AT ruptures is not fully understood. This study evaluates the effect and interactions between, strain and age on the in vitro biomechanical properties of ATs. Methods: Bilateral ATs were harvested from 17 young (8 months) and 14 middle-aged (24 months) rats and underwent stress-relaxation using Fung's quasilinear viscoelastic (QLV) modeling and load-to-failure testing...
July 2017: Muscles, Ligaments and Tendons Journal
Marc Soubeyrand, Elisabeth Laemmel, Nathalie Maurel, Amadou Diop, Thierry Lazure, Jacques Duranteau, Eric Vicaut
BACKGROUND: Surgical reconstruction of ligaments and tendons is frequently required in clinical practice. The commonly used autografts, allografts, or synthetic transplants present limitations in terms of availability, biocompatibility, cost, and mechanical properties that tissue bioengineering aims to overcome. It classically combines an exogenous extracellular matrix with cells, but this approach remains complex and expensive. Using a rat model, we tested a new bioengineering strategy for the in vivo and de novo generation of autologous grafts without the addition of extracellular matrix or cells, and analyzed their biomechanical and structural properties...
December 14, 2017: Clinical Biomechanics
Cristiano Pedrozo Vieira, Manuela Viola, Giane Daniela Carneiro, Maria Luisa D'Angelo, Cristina Pontes Vicente, Alberto Passi, Edson Rosa Pimentel
Tendinitis changes the biochemical and morphological properties of the tendon, promoting an increase of activity of metalloproteinases and disorganization of collagen bundles. Tenocytes, the primary cells in tendon, are scattered throughout the collagenic fibers, and are responsible of tendon remodeling and tissue repair in pathological condition. In vivo, glycine, component of the typical Gly-X-Y collagen tripeptide, showed beneficial effects in biochemical and biomechanical properties of Achilles tendon with tendinitis...
January 18, 2018: Cell Biology International
Taija Finni, Michel Bernabei, Guus C Baan, Wendy Noort, Chris Tijs, Huub Maas
Achilles tendon (AT) comprises of three subtendons arising from the soleus (SOL) and the lateral (LG) and medial (MG) heads of the gastrocnemius muscle. While recent human studies show differential displacement within AT, these displacement have not been attributed to specific subtendons. We tested the hypothesis that the SOL and LG subtendons show differential displacement and strain during various combinations of SOL, LG and MG excitations. Movement of knots, sutured onto SOL and LG subtendons of 12 Wistar rats, was videotaped while the muscles were stimulated intramuscularly and ankle torque was assessed...
November 1, 2017: Scandinavian Journal of Medicine & Science in Sports
Shin Hyuk Kang, Min Seok Choi, Han Koo Kim, Woo Seob Kim, Tae Hui Bae, Mi Kyung Kim, Seung Hwan Chang
Tendon injuries are major musculoskeletal disorders. Polydeoxyribonucleotide activates the adenosine receptor subtype A2A, resulting in tissue growth and neogenesis. This experimental study confirms that polydeoxyribonucleotide can improve secretion of various growth factors, promote collagen synthesis, and restore tensile strength of the Achilles tendon in a rat model with Achilles tendon injury. Thirty-six male Sprague-Dawley rats, aged 7 weeks, were divided into two groups, and the Achilles tendon was transected and repaired using the modified Kessler's method...
November 2, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Zheng Chen, Yongjun Rui, Yajun Xu, Quanrong Zhang, Zhenzhong Sun, Jiandong Zhou, Xueming Chen
Hand trauma arising from postoperative acute or chronic tendon injuries leads to delayed union and is one of the greatest challenges in clinical practice. The present study hypothesized that an extracellular matrix hydrogel made from tendons can promote tendon healing and improve tissue regeneration. To verify this, 36 Wistar rats were subjected to bilateral full-thickness injury of their Achilles tendons, starting from the heel bone along the center line to remove a segment of 5 mm in length and 0.5 mm in width...
November 2017: Experimental and Therapeutic Medicine
Paula Hernandez, Dustin Buller, Thomas Mitchell, Jamie Wright, Haixiang Liang, Kshitij Manchanda, Tre Welch, Ryan M Huebinger, Deborah L Carlson, Steven E Wolf, Juquan Song
Severe burn causes systemic inflammation and hypercatabolism, resulting in damage to multiple organs distant to the burn site, including the musculoskeletal system. Bone mass and muscle loss have been reported. However, tendon that connects bone and muscle has not been studied in comparable detail. Here we aimed to characterize the molecular and functional changes in Achilles tendon triggered by severe burn. Forty male Sprague-Dawley rats received 40% total body surface area scald burn. Achilles tendons were collected up to 14 days post burn...
October 23, 2017: Shock
Hanifeh Khayyeri, Parmis Blomgran, Malin Hammerman, Mikael J Turunen, Annika Löwgren, Manuel Guizar-Sicairos, Per Aspenberg, Hanna Isaksson
Tendon function and homeostasis rely on external loading. This study investigates the biological mechanisms behind tendon biomechanical function and how the mechanical performance is affected by reduced daily loading. The Achilles tendons of 16 weeks old female Sprague Dawley rats (n = 40) were unloaded for 5 weeks by inducing muscle paralysis with botulinum toxin injections in the right gastrocnemius and soleus muscles. The contralateral side was used as control. After harvest, the tendons underwent biomechanical testing to assess viscoelasticity (n = 30 rats) and small angle X-ray scattering to determine the structural properties of the collagen fibrils (n = 10 rats)...
October 12, 2017: Scientific Reports
Jialin Chen, Erchen Zhang, Wei Zhang, Zeyu Liu, Ping Lu, Ting Zhu, Zi Yin, Ludvig J Backman, Huanhuan Liu, Xiao Chen, Hongwei Ouyang
Stem cells have been widely used in tendon tissue engineering. The lack of refined and controlled differentiation strategy hampers the tendon repair and regeneration. This study aims to find new effective differentiation factors for stepwise tenogenic differentiation. By microarray screening, the transcript factor Fos was found to be expressed in significantly higher amounts in postnatal Achilles tendon tissue derived from 1 day as compared with 7-days-old rats. It was further confirmed that expression of Fos decreased with time in postnatal rat Achilles tendon, which was accompanied with the decreased expression of multiply tendon markers...
October 10, 2017: Stem Cells Translational Medicine
Md Abdul Alim, Paul W Ackermann, Pernilla Eliasson, Parmis Blomgran, Per Kristiansson, Gunnar Pejler, Magnus Peterson
The role of inflammation and the mechanism of tendon healing after rupture has historically been a matter of controversy. The purpose of the present study is to investigate the role of mast cells and their relation to the NMDA receptor-1 (a glutamate receptor) during healing after Achilles tendon rupture. Eight female Sprague Dawley rats had their right Achilles tendon transected. Three weeks after rupture, histological quantification of mast cell numbers and their state of degranulation was assessed by histochemistry...
December 2017: Cell and Tissue Research
Parmis Blomgran, Malin Hammerman, Per Aspenberg
Inflammation initiates tendon healing and then normally resolves more or less completely. Unresolved inflammation might disturb the remodeling process. We hypothesized that suppression of inflammation during the early remodeling phase by systemic dexamethasone treatment can improve healing. 36 rats underwent Achilles tendon transection and were randomized to dexamethasone or saline on days 0-4 after surgery (early inflammatory phase), and euthanasia day 7. Another 54 rats received injections days 5-9 (early remodeling phase) and were euthanized day 12 for mechanical, histological and flow cytometric evaluation...
September 29, 2017: Scientific Reports
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