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Sayin D, Gundogdu G, Kilic-Erkek O, Gundogdu K, Coban HS, Abban-Mete G. Silk protein sericin: a promising therapy for Achilles tendinopathy-evidence from an experimental rat model. Clin Rheumatol 2023; 42:3361-3373. [PMID: 37733079 DOI: 10.1007/s10067-023-06767-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 08/29/2023] [Accepted: 09/02/2023] [Indexed: 09/22/2023]
Abstract
OBJECTIVE This study investigated the efficacy of sericin in treating experimental Achilles tendinopathy (AT) in rats via the transforming growth factor-beta (TGF-β)/mothers against decapentaplegic (Smad) pathway compared with diclofenac sodium (DS). METHOD An AT model was induced in rats using collagenase enzyme type I and divided into 5 groups: C (control), AT (diseased control), ATS (AT treated with sericin), ATN (AT treated with DS), and ATSN (AT treated with sericin and DS). Sericin injection was given on the 3rd and 6th days by intratendinous injection (0.8 g/kg/mL), and DS was administered for 14 days by oral gavage (1.1 mg/kg/day). Serum concentrations of total oxidant-antioxidant status (TOS-TAS), TGF-β1, decorin, Smad2, and connective tissue growth factor (CTGF) were measured. Histopathologic and immunohistochemical (IHC) studies were conducted on Achilles tendon samples. RESULTS The TOS, oxidative stress index (OSI), TGF-β1, Smad2, CTGF, and decorin serum concentrations were significantly higher in AT than in C and significantly lower in ATS than in AT (P<0.05). Histopathological examination revealed that irregular fibers, degeneration, and round cell nuclei were significantly elevated in AT. Spindle-shaped fibers were similar to those in C, and degeneration was reduced in ATS. TGF-β1 and Smad2/3 expression was increased, and collagen type I alpha-1 (Col1A1) expression was decreased in AT vs. C (P=0.001). In the ATS, TGF-β1 and Smad2/3 expression decreased, and Col1A1 expression increased. The Bonar score significantly increased in the AT group (P =0.001) and significantly decreased in the ATS group (P =0.027). CONCLUSION Sericin shows potential efficacy in reducing oxidative stress and modulating the TGF-β/Smad pathway in experimental AT models in rats. It may be a promising therapeutic agent for AT, warranting further clinical studies for validation. Key Points • This study revealed that sericin mitigates AT-induced damage through the TGF-β/Smad pathway in an AT rat model. • ELISA and IHC investigations corroborated the effectiveness of sericin via the pivotal TGF-β/Smad pathway in tissue repair. • Evidence indicates that sericin enhances collagen synthesis,shapes tendon fiber structure, and diminishes histopathological degeneration. • Sericin's antioxidant properties were reaffirmed in its AT treatment application.
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Affiliation(s)
- Dilek Sayin
- Department of Physiology, Faculty of Medicine, Pamukkale University, Denizli, Turkey
| | - Gulsah Gundogdu
- Department of Physiology, Faculty of Medicine, Pamukkale University, Denizli, Turkey.
| | - Ozgen Kilic-Erkek
- Department of Physiology, Faculty of Medicine, Pamukkale University, Denizli, Turkey
| | - Koksal Gundogdu
- Department of Orthopedics and Traumatology, Denizli State Hospital, Denizli, Turkey
| | - Hatice Siyzen Coban
- Department of Histology and Embryology, Zeynep Kamil Women and Children Diseases Training and Research Hospital, Istanbul, Turkey
| | - Gulcin Abban-Mete
- Department of Histology and Embryology, Faculty of Medicine, Pamukkale University, Denizli, Turkey
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Yu YH, Lee CH, Hsu YH, Chou YC, Yu PC, Huang CT, Liu SJ. Anti-Adhesive Resorbable Indomethacin/Bupivacaine-Eluting Nanofibers for Tendon Rupture Repair: In Vitro and In Vivo Studies. Int J Mol Sci 2023; 24:16235. [PMID: 38003425 PMCID: PMC10671766 DOI: 10.3390/ijms242216235] [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: 10/20/2023] [Revised: 11/08/2023] [Accepted: 11/09/2023] [Indexed: 11/26/2023] Open
Abstract
The treatment and surgical repair of torn Achilles tendons seldom return the wounded tendon to its original elasticity and stiffness. This study explored the in vitro and in vivo simultaneous release of indomethacin and bupivacaine from electrospun polylactide-polyglycolide composite membranes for their capacity to repair torn Achilles tendons. These membranes were fabricated by mixing polylactide-polyglycolide/indomethacin, polylactide-polyglycolide/collagen, and polylactide-polyglycolide/bupivacaine with 1,1,1,3,3,3-hexafluoro-2-propanol into sandwich-structured composites. Subsequently, the in vitro pharmaceutic release rates over 30 days were determined, and the in vivo release behavior and effectiveness of the loaded drugs were assessed using an animal surgical model. High concentrations of indomethacin and bupivacaine were released for over four weeks. The released pharmaceutics resulted in complete recovery of rat tendons, and the nanofibrous composite membranes exhibited exceptional mechanical strength. Additionally, the anti-adhesion capacity of the developed membrane was confirmed. Using the electrospinning technique developed in this study, we plan on manufacturing degradable composite membranes for tendon healing, which can deliver sustained pharmaceutical release and provide a collagenous habitat.
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Affiliation(s)
- Yi-Hsun Yu
- Department of Orthopedic Surgery, Bone and Joint Research Center, Chang Gung Memorial Hospital-Linkou, Taoyuan 33305, Taiwan; (Y.-H.Y.)
| | - Chen-Hung Lee
- Division of Cardiology, Department of Internal Medicine, Chang Gung Memorial Hospital-Linkou, Chang Gung University College of Medicine, Taoyuan 33305, Taiwan
| | - Yung-Heng Hsu
- Department of Orthopedic Surgery, Bone and Joint Research Center, Chang Gung Memorial Hospital-Linkou, Taoyuan 33305, Taiwan; (Y.-H.Y.)
| | - Ying-Chao Chou
- Department of Orthopedic Surgery, Bone and Joint Research Center, Chang Gung Memorial Hospital-Linkou, Taoyuan 33305, Taiwan; (Y.-H.Y.)
| | - Ping-Chun Yu
- Department of Mechanical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Chao-Tsai Huang
- Department of Chemical and Materials Engineering, Tamkang University, New Taipei City 25137, Taiwan;
| | - Shih-Jung Liu
- Department of Orthopedic Surgery, Bone and Joint Research Center, Chang Gung Memorial Hospital-Linkou, Taoyuan 33305, Taiwan; (Y.-H.Y.)
- Department of Mechanical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
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Kulesza A, Zielniok K, Hawryluk J, Paczek L, Burdzinska A. Ibuprofen in Therapeutic Concentrations Affects the Secretion of Human Bone Marrow Mesenchymal Stromal Cells, but Not Their Proliferative and Migratory Capacity. Biomolecules 2022; 12:biom12020287. [PMID: 35204788 PMCID: PMC8961564 DOI: 10.3390/biom12020287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 01/28/2022] [Accepted: 02/03/2022] [Indexed: 11/29/2022] Open
Abstract
Mesenchymal stromal cells (MSCs) are able to modulate the immune system activity and the regeneration processes mainly through the secretion of multiple soluble factors, including prostaglandin E2 (PGE2). PGE2 is produced as a result of cyclooxygenases (COX) activity. In the present study, we investigated how ibuprofen, a nonselective COX inhibitor, affects the proliferation, migration and secretion of human bone marrow MSCs (hBM-MSCs). For this purpose, six hBM-MSCs populations were treated with ibuprofen at doses which do not differ from maximum serum concentrations during standard pharmacotherapy. Ibuprofen treatment (25 or 50 µg/mL) substantially reduced the secretion of PGE2 in all tested populations. Following ibuprofen administration, MSCs were subjected to proliferation (BrdU), transwell migration, and scratch assays, while its effect on MSCs secretome was evaluated by Proteome Profiler and Luminex immunoassays. Ibuprofen did not cause statistically significant changes in the proliferation rate and migration ability of MSCs (p > 0.05). However, ibuprofen (25 µg/mL for 3 days) significantly decreased mean secretion of: CCL2 (by 44%), HGF (by 31%), IL-6 (by 22%), VEGF (by 20%) and IL-4 (by 8%) compared to secretion of control MSCs (p < 0.05). Our results indicate that ibuprofen at therapeutic concentrations may impair the pro-regenerative properties of hBM-MSCs.
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Affiliation(s)
- Agnieszka Kulesza
- Department of Immunology, Transplantology and Internal Diseases, Faculty of Medicine, Medical University of Warsaw, Nowogrodzka 59, 02-006 Warsaw, Poland; (A.K.); (J.H.); (L.P.)
| | - Katarzyna Zielniok
- Department of Clinical Immunology, Faculty of Medicine, Medical University of Warsaw, Nowogrodzka 59, 02-006 Warsaw, Poland;
| | - Jakub Hawryluk
- Department of Immunology, Transplantology and Internal Diseases, Faculty of Medicine, Medical University of Warsaw, Nowogrodzka 59, 02-006 Warsaw, Poland; (A.K.); (J.H.); (L.P.)
| | - Leszek Paczek
- Department of Immunology, Transplantology and Internal Diseases, Faculty of Medicine, Medical University of Warsaw, Nowogrodzka 59, 02-006 Warsaw, Poland; (A.K.); (J.H.); (L.P.)
- Department of Bioinformatics, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warsaw, Poland
| | - Anna Burdzinska
- Department of Immunology, Transplantology and Internal Diseases, Faculty of Medicine, Medical University of Warsaw, Nowogrodzka 59, 02-006 Warsaw, Poland; (A.K.); (J.H.); (L.P.)
- Correspondence:
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Kurzyk A. Mesenchymal Stem Cell Seeding on 3D Scaffolds. Methods Mol Biol 2022; 2429:417-434. [PMID: 35507178 DOI: 10.1007/978-1-0716-1979-7_28] [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] [Indexed: 06/14/2023]
Abstract
Evaluation of mesenchymal stem cell seeding efficiency in three-dimensional (3D) scaffolds is a critical step for constructing a potent and useful tissue engineering product for regenerative medicine. To determine the quantity of cells seeded on a scaffold, their condition and viability, and/or to confirm cell adhesion to the scaffold surface, a number of cellular assays are used. The assays are most often based on a direct or indirect colorimetric-, fluorimetric-, bioluminescent-, or isotope-based measurement of changes reflecting the activity of cellular processes. This chapter presents a selection of assays measuring the efficiency of cell seeding on scaffolds, that is, the MTS (3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium)) assay, the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay, the ATP (adenosine triphosphate), DAPI (4',6-diamidino-2-phenylindole) assay, the Alamar Blue (7-hydroxy-10-oxidophenoxazin-10-ium-3-one, resazurin) assay and the Pico Green dsDNA (N'-[3-(dimethylamino)propyl]-N,N-dimethyl-N'-[4-[(E)-(3-methyl-1,3-benzothiazol-2-ylidene)methyl]-1-phenylquinolin-1-ium-2-yl]propane-1,3-diamine) assay. These assays monitor the number of viable cells, sometimes in conjunction with specifying cell membrane integrity, determine enzymatic activity associated with cell metabolism, measure cell proliferation rate, and assess the total protein or DNA content in the cell-scaffold construct. The choice of the appropriate methods and the details for testing 3D cultures are of utmost importance to properly evaluate tissue engineering products. Still, developing standards for assessment of cell-scaffold constructs remains a challenge in tissue engineering.
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Affiliation(s)
- Agata Kurzyk
- Department of Cancer Biology, Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland.
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Sea Bass Primary Cultures versus RTgill-W1 Cell Line: Influence of Cell Model on the Sensitivity to Nanoparticles. NANOMATERIALS 2021; 11:nano11113136. [PMID: 34835900 PMCID: PMC8620814 DOI: 10.3390/nano11113136] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/14/2021] [Accepted: 11/15/2021] [Indexed: 01/09/2023]
Abstract
Determination of acute toxicity to vertebrates in aquatic environments is mainly performed following OECD test guideline 203, requiring the use of a large number of fish and with mortality as endpoint. This test is also used to determine toxicity of nanomaterials in aquatic environments. Since a replacement method for animal testing in nanotoxicity studies is desirable, the feasibility of fish primary cultures or cell lines as a model for nanotoxicity screenings is investigated here. Dicentrarchus labrax primary cultures and RTgill-W1 cell line were exposed to several concentrations (0.1 to 200 ug/mL) of different nanoparticles (TiO2, polystyrene and silver), and cytotoxicity, metabolic activity and reactive oxygen species formation were investigated after 24 and 48 h of exposure. Protein corona as amount of protein bound, as well as the influence of surface modification (-COOH, -NH2), exposure media (Leibovitz’s L15 or seawater), weathering and cell type were the experimental variables included to test their influence on the results of the assays. Data from all scenarios was split based on the significance each experimental variable had in the result of the cytotoxicity tests, in an exploratory approach that allows for better understanding of the determining factors affecting toxicity. Data shows that more variables significantly influenced the outcome of toxicity tests when the primary cultures were exposed to the different nanoparticles. Toxicity tests performed in RTgill-W1 were influenced only by exposure time and nanoparticle concentration. The whole data set was integrated in a biological response index to show the overall impact of nanoparticle exposures.
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Kraus NR, Garvey KD, Higgins LD, Matzkin E. Ibuprofen Use Did Not Affect Outcome Metrics After Arthroscopic Rotator Cuff Repair. Arthrosc Sports Med Rehabil 2021; 3:e491-e497. [PMID: 34027460 PMCID: PMC8129460 DOI: 10.1016/j.asmr.2020.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 11/15/2020] [Indexed: 01/02/2023] Open
Abstract
Purpose To determine whether patients who are prescribed ibuprofen after arthroscopic rotator cuff repair have significantly different patient-reported outcomes for pain, function, and overall health at baseline and 1 and 2 years after operation relative to patients only prescribed opioids. Methods Patients who underwent a rotator cuff repair by a total of 3 surgeons and participated in the outcomes registry from 2012 to 2016 were screened for inclusion in this study. Inclusion criteria were primary arthroscopic rotator cuff repair, at least 2 years from the date of surgery and over the age of 18. Exclusion criteria were revision and open rotator cuff repair. All patients followed the standard postoperative rehabilitation protocol for rotator cuff repair. Patients were divided into 2 cohorts. Group I included patients who received ibuprofen/nonsteroidal anti-inflammatory agents (NSAID) after surgery (n = 281), and Group II consisted of patients who did not receive ibuprofen/NSAID after surgery (n = 182). Patient-reported outcome measures for Visual Analogue Scale, American Shoulder Elbow Surgeons score, Single Assessment Numeric Evaluation score, Simple Shoulder Test and The Veterans Rand 12-Item Health Survey were collected preoperatively and at 3 and 6 months, 1 year, and 2 years after surgery. Statistical analysis was performed to compare patient-reported outcome measures between Group I and II. Results This study consisted of 463 patients who underwent arthroscopic rotator cuff repair, and patients were divided into 2 cohorts. There were 281 patients who did not receive ibuprofen/NSAID after operation in Group I and 182 patients who did receive ibuprofen in Group II. There were no statistically significant differences between the 2 groups in age at treatment, mean body mass index, gender, ethnicity, diabetes, and number of rotator cuff tendons involved; however, there was a statistically significant difference in receiving worker’s compensation (P = .005), and this was subsequently adjusted for in our analysis. There were no significant differences in patient-reported outcomes for all metrics between the group prescribed ibuprofen and the group that was not prescribed ibuprofen at 1 and 2 years after surgery or in change from baseline. Conclusion Patients receiving ibuprofen did as well as patients who did not receive ibuprofen after arthroscopic rotator cuff repair on patient-reported outcome measures assessing shoulder pain, function, and overall health. Level of Evidence Level III, retrospective comparative study.
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Affiliation(s)
- Nicholas R Kraus
- Tufts University School of Medicine, Boston, Massachusetts.,Department of Orthopaedic Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Kirsten D Garvey
- Tufts University School of Medicine, Boston, Massachusetts.,Department of Orthopaedic Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Laurence D Higgins
- Department of Orthopaedic Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Elizabeth Matzkin
- Department of Orthopaedic Surgery, Brigham and Women's Hospital, Boston, Massachusetts
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7
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Ghosh N, Kolade OO, Shontz E, Rosenthal Y, Zuckerman JD, Bosco JA, Virk MS. Nonsteroidal Anti-Inflammatory Drugs (NSAIDs) and Their Effect on Musculoskeletal Soft-Tissue Healing: A Scoping Review. JBJS Rev 2020; 7:e4. [PMID: 31851037 DOI: 10.2106/jbjs.rvw.19.00055] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Nonsteroidal anti-inflammatory drugs (NSAIDs) are being increasingly employed as a part of multimodal non-opioid strategies to treat postoperative pain. In the present study, we sought to review the effects of short-term NSAID use on musculoskeletal soft-tissue healing. METHODS We performed a scoping review of all studies that included the use of NSAIDs and their effect on healing of soft tissues, which for the purpose of this review refers to non-osseous musculoskeletal tissue such as ligament, tendon, labrum, and meniscus. The inclusion criteria encompassed all studies (human, animal, and in vitro) that evaluated the effect of NSAIDs on soft-tissue healing. Subgroup analyses, wherever applicable, were conducted on the basis of the type of NSAID (cyclooxygenase [COX]-specific or nonspecific) and the type of study (human, animal, or in vitro). Relevant metadata from each study were abstracted, and descriptive statistics were used to summarize the results. RESULTS A total of 44 studies met the inclusion criteria, including 3 human studies, 33 animal studies, and 8 in vitro studies. These studies included 4 different NSAIDs in the human subgroup, 16 different NSAIDs in the animal subgroup, and 7 different NSAIDs in the in vitro subgroup. The majority of reported studies (including 1 of 2 human studies, 10 of 14 animal studies, and 3 of 3 in vitro studies) demonstrated that COX-2-selective inhibitors had negative impact on soft-tissue healing. In contrast, the majority of human and animal studies (2 of 2 and 19 of 30, respectively) demonstrated that nonselective COX inhibitors had no negative effect on the healing of labrum, tendons, and ligaments. The majority of in vitro studies demonstrated that NSAIDs have a harmful effect on biological processes involved in tendon-healing and regeneration (tenocyte proliferation, collagen and glycosaminoglycan synthesis). CONCLUSIONS Current limited evidence demonstrates that selective COX-2 inhibitors can negatively affect healing of musculoskeletal soft tissue after surgical repair. In contrast, the majority of studies demonstrate that nonselective COX inhibitors have no negative effect on musculoskeletal soft-tissue healing. Additional high-quality human clinical trials are necessary to provide more definitive conclusions.
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Affiliation(s)
- Niloy Ghosh
- Department of Orthopedic Surgery, NYU Langone Orthopedic Hospital, New York, NY
| | | | | | - Yoav Rosenthal
- Department of Orthopedic Surgery, NYU Langone Orthopedic Hospital, New York, NY
| | - Joseph D Zuckerman
- Department of Orthopedic Surgery, NYU Langone Orthopedic Hospital, New York, NY
| | - Joseph A Bosco
- Department of Orthopedic Surgery, NYU Langone Orthopedic Hospital, New York, NY
| | - Mandeep S Virk
- Department of Orthopedic Surgery, NYU Langone Orthopedic Hospital, New York, NY
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8
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El Jamal A, Briolay A, Mebarek S, Le Goff B, Blanchard F, Magne D, Brizuela L, Bougault C. Cytokine-Induced and Stretch-Induced Sphingosine 1-Phosphate Production by Enthesis Cells Could Favor Abnormal Ossification in Spondyloarthritis. J Bone Miner Res 2019; 34:2264-2276. [PMID: 31373726 DOI: 10.1002/jbmr.3844] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 07/11/2019] [Accepted: 07/19/2019] [Indexed: 12/12/2022]
Abstract
Spondyloarthritis (SpA) is a common rheumatic disease characterized by enthesis inflammation (enthesitis) and ectopic ossification (enthesophytes). The current pathogenesis model suggests that inflammation and mechanical stress are both strongly involved in SpA pathophysiology. We have previously observed that the levels of sphingosine 1-phosphate (S1P), a bone anabolic molecule, were particularly high in SpA patients' serum compared to healthy donors. Therefore, we wondered how this deregulation was related to SpA molecular mechanisms. Mouse primary osteoblasts, chondrocytes, and tenocytes were used as cell culture models. The sphingosine kinase 1 (Sphk1) gene expression and S1P secretion were significantly enhanced by cyclic stretch in osteoblasts and chondrocytes. Further, TNF-α and IL-17, cytokines implicated in enthesitis, increased Sphk1 mRNA in chondrocytes in an additive manner when combined to stretch. The immunochemistry on mouse ankles showed that sphingosine kinase 1 (SK1) was localized in some chondrocytes; the addition of a pro-inflammatory cocktail augmented Sphk1 expression in cultured ankles. Subsequently, fingolimod was used to block S1P metabolism in cell cultures. It inhibited S1P receptors (S1PRs) signaling and SK1 and SK2 activity in both osteoblasts and chondrocytes. Fingolimod also reduced S1PR-induced activation by SpA patients' synovial fluid (SF), demonstrating that the stimulation of chondrocytes by SFs from SpA patients involves S1P. In addition, when the osteogenic culture medium was supplemented with fingolimod, alkaline phosphatase activity, matrix mineralization, and bone formation markers were significantly reduced in osteoblasts and hypertrophic chondrocytes. Osteogenic differentiation was accompanied by an increase in S1prs mRNA, especially S1P1/3 , but their contribution to S1P-impact on mineralization seemed limited. Our results suggest that S1P might be overproduced in SpA enthesis in response to cytokines and mechanical stress, most likely by chondrocytes. Moreover, S1P could locally favor the abnormal ossification of the enthesis; therefore, blocking the S1P metabolic pathway could be a potential therapeutic approach for the treatment of SpA. © 2019 American Society for Bone and Mineral Research.
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Affiliation(s)
- Alaeddine El Jamal
- Univ Lyon, Univ Claude Bernard Lyon 1 (UCBL), CNRS, UMR5246, Lyon, France
| | - Anne Briolay
- Univ Lyon, Univ Claude Bernard Lyon 1 (UCBL), CNRS, UMR5246, Lyon, France
| | - Saida Mebarek
- Univ Lyon, Univ Claude Bernard Lyon 1 (UCBL), CNRS, UMR5246, Lyon, France
| | - Benoit Le Goff
- INSERM UMR1238, Nantes University, Nantes, France.,Rheumatology Department, Nantes University, Nantes, France
| | | | - David Magne
- Univ Lyon, Univ Claude Bernard Lyon 1 (UCBL), CNRS, UMR5246, Lyon, France
| | - Leyre Brizuela
- Univ Lyon, Univ Claude Bernard Lyon 1 (UCBL), CNRS, UMR5246, Lyon, France
| | - Carole Bougault
- Univ Lyon, Univ Claude Bernard Lyon 1 (UCBL), CNRS, UMR5246, Lyon, France
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Zhang L, Xu J, Fu S, Qin B, Liu Y, Yang Y, Wang M, Li D, Zhong S, Huang W. Distribution and Morphological Measurement of Bony Spurs on the Coracoid Process in a Chinese Population. Med Sci Monit 2019; 25:2527-2534. [PMID: 30953435 PMCID: PMC6463619 DOI: 10.12659/msm.913658] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Background There are few studies on distributions or morphological measurements for bony spurs form at the attachment points of the ligaments and tendons on the coracoid process. The aim of this study was to investigate their most common sites and morphological characteristics, and to propose possible reasons. Material/Methods Scapulae with bony spurs on the coracoid process were selected from 377 intact and dry Chinese scapulae. The distribution, height, and transverse and longitudinal diameter of the bony spurs were measured in each coracoid process. Results We selected 71 scapulae, 36 left and 35 right, that had bony spurs, from 377 scapulae. The bony spurs were most commonly located at the attachment point of the superior transverse scapular ligament (STSL) (31, 23.66%), while the trapezoid ligament (TL) accounted for the smaller proportion (8, 6.11%). The TSL was the highest, with the minimum transverse and longitudinal diameter, while the TL had the greatest transverse and longitudinal diameters. Only the TSL and TL had a statistically significant difference between the left and the right bony spur regarding the longitudinal diameter (P<0.05). Conclusions Bony spurs are more likely to form at the attachment points of ligaments and tendons on the coracoid process, which has a greater risk of traction injuries or attachment points avulsion fractures.
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Affiliation(s)
- Lei Zhang
- National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China (mainland).,Department of Orthopedics, Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou, Sichuan, China (mainland).,Academician Workstation in Luzhou, Luzhou, Sichuan, China (mainland)
| | - Jie Xu
- School of Traditional Chinese Medicine, Southwest Medical University, Luzhou, Sichuan, China (mainland).,Southern Medical University Technology, Ltd., Shunde Science Park, Guangzhou, Guangdong, China (mainland)
| | - Shijie Fu
- Department of Orthopedics, Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou, Sichuan, China (mainland).,Academician Workstation in Luzhou, Luzhou, Sichuan, China (mainland)
| | - Bo Qin
- Department of Orthopedics, Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou, Sichuan, China (mainland).,Academician Workstation in Luzhou, Luzhou, Sichuan, China (mainland)
| | - Yang Liu
- Department of Orthopedics, Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou, Sichuan, China (mainland).,Academician Workstation in Luzhou, Luzhou, Sichuan, China (mainland)
| | - Yang Yang
- National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China (mainland).,Southern Medical University Technology, Ltd., Shunde Science Park, Guangzhou, Guangdong, China (mainland).,Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangzhou, Guangdong, China (mainland)
| | - Mian Wang
- National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China (mainland).,Southern Medical University Technology, Ltd., Shunde Science Park, Guangzhou, Guangdong, China (mainland).,Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangzhou, Guangdong, China (mainland)
| | - Ding Li
- National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China (mainland).,Southern Medical University Technology, Ltd., Shunde Science Park, Guangzhou, Guangdong, China (mainland).,Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangzhou, Guangdong, China (mainland)
| | - Shizhen Zhong
- National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China (mainland).,Academician Workstation in Luzhou, Luzhou, Sichuan, China (mainland)
| | - Wenhua Huang
- National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China (mainland).,Academician Workstation in Luzhou, Luzhou, Sichuan, China (mainland).,Southern Medical University Technology, Ltd., Shunde Science Park, Guangzhou, Guangdong, China (mainland).,Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangzhou, Guangdong, China (mainland)
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10
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Lisowska B, Kosson D, Domaracka K. Positives and negatives of nonsteroidal anti-inflammatory drugs in bone healing: the effects of these drugs on bone repair. DRUG DESIGN DEVELOPMENT AND THERAPY 2018; 12:1809-1814. [PMID: 29950815 PMCID: PMC6016595 DOI: 10.2147/dddt.s164565] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Tissue damage following injury triggers the processes of coagulation, inflammation and healing. In tissues surrounding the bone, the result of the healing process is a scar, while bone tissue has a unique ability to achieve shape, strength and pre-injury function. Bone healing is a process of regeneration rather than classic recovery. The result of this process is the formation of new, healthy bone tissue instead of a scar. Many factors can inhibit or impair the bone healing process, and their influence is critical during the stages of inflammation and angiogenesis and finally on the clinical outcome. Nonsteroidal anti-inflammatory drugs (NSAIDs) play an essential role associated with their analgesic potency and anti-inflammatory effects. NSAIDs are also the most often used drugs in patients who require pain control and inflammation reduction due to musculoskeletal diseases or injures. Although their analgesic effect is well documented, NSAIDs also interfere with bone healing; therefore, the relative benefits and disadvantages connected with their administration should be taken into consideration. Despite the negative effect, NSAIDs have beneficial properties, but their clinical benefits in relation to dose and time of use are still unclear. Therefore, in this review, we focus on bone healing with relation to the impact of NSAIDs.
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Affiliation(s)
- Barbara Lisowska
- Department of Anesthesiology and Intensive Care, John Paul II Western Hospital, Grodzisk Mazowiecki, Poland
| | - Dariusz Kosson
- Department of Anaesthesiology and Intensive Care, Medical University of Warsaw, Division of Teaching Warsaw, Warsaw, Poland
| | - Karolina Domaracka
- Department of Anaesthesiology and Intensive Care, Medical University of Warsaw, Warsaw, Poland
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11
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Bougault C, El Jamal A, Briolay A, Mebarek S, Boutet MA, Garraud T, Le Goff B, Blanchard F, Magne D, Brizuela L. Involvement of sphingosine kinase/sphingosine 1-phosphate metabolic pathway in spondyloarthritis. Bone 2017; 103:150-158. [PMID: 28684192 DOI: 10.1016/j.bone.2017.07.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 06/23/2017] [Accepted: 07/01/2017] [Indexed: 12/13/2022]
Abstract
Spondyloarthritis (SpA) is a relatively common chronic inflammatory joint disorder, with a prevalence of about 0.2-0.5% worldwide. The primary target of the pathological process is the enthesis, where tendons and ligaments attach to underlying bone. These insertion sites are hotspots of bone formation (enthesophytes), which can lead to ankylosis. Unfortunately, the mechanisms causing the onset and progression of entheseal ossification remain largely unknown. Sphingosine 1-phosphate (S1P), a lipid generated after sphingosine phosphorylation by sphingosine kinases 1 and 2 (SK1/2), plays important roles in cell proliferation, differentiation and survival. S1P regulates fundamental biological processes such as cell cycle, inflammatory response or bone homeostasis. Indeed, S1P has been involved in some of most-spread skeletal diseases such as rheumatoid arthritis or osteoarthritis. On the other hand, the implication of S1P in SpA has not been explored yet. In the present work, we observed by ELISA that S1P content was significantly increased in the serum of SpA patients (6.1±4.2μM, n=21) compared to healthy donors (1.6±0.9μM, n=12). In vitro, gene expression of SK1 and SK2 as well as their activity were increased during differentiation of primary murine chondrocytes and osteoblasts into mineralizing cells. In addition, mRNA of the S1P-specific transporter Spns2 and S1P secretion were augmented. Using the pharmacological drugs SKi (SK pan-inhibitor), PF-543 (SK1 specific inhibitor) or K-145 (SK2 specific inhibitor), we showed that the inhibition of SK1 and/or SK2 decreased matrix mineralization, alkaline phosphatase activity and the mRNA expression of Runx2 and Bglap in chondrocytes and osteoblasts. To our knowledge, this is the first study indicating that S1P levels are significantly increased in serum from SpA patients. Moreover, we showed in vitro that SK activity was involved in the mineralization capacity of osteoblasts and chondrocytes. S1P metabolic pathway may represent an ingenious therapeutic target for SpA in the future.
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Affiliation(s)
- Carole Bougault
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS UMR 5246, ICBMS, F-69622 Lyon, France
| | - Alaeddine El Jamal
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS UMR 5246, ICBMS, F-69622 Lyon, France
| | - Anne Briolay
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS UMR 5246, ICBMS, F-69622 Lyon, France
| | - Saida Mebarek
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS UMR 5246, ICBMS, F-69622 Lyon, France
| | | | | | | | | | - David Magne
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS UMR 5246, ICBMS, F-69622 Lyon, France
| | - Leyre Brizuela
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS UMR 5246, ICBMS, F-69622 Lyon, France.
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12
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Bougault C, Briolay A, Boutet MA, Pilet P, Delplace S, Le Goff B, Guicheux J, Blanchard F, Magne D. Wnt5a is expressed in spondyloarthritis and exerts opposite effects on enthesis and bone in murine organ and cell cultures. Transl Res 2015; 166:627-38. [PMID: 26163991 DOI: 10.1016/j.trsl.2015.06.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 06/07/2015] [Accepted: 06/16/2015] [Indexed: 12/17/2022]
Abstract
Spondyloarthritis (SpA) is a chronic inflammatory joint disorder that initiates at the enthesis, where tendons attach to bone through a fibrocartilage zone. At late stages, excessive bone apposition appears within the diseased enthesis. Because Wnt5a participates to normal bone formation and appears related to inflammatory processes, we investigated the role of this Wnt growth factor in inflammation-associated ossification in SpA. The concentration of Wnt5a assessed by enzyme-linked immunosorbent assay in synovial fluids of patients with SpA (2.58 ± 0.98 ng/mL) was higher than in osteoarthritic patients (1.33 ± 0.71 ng/mL). In murine primary cultures of tendon cells, chondrocytes, and osteoblasts and in an organotypic model of mouse ankle, we showed that tumor necrosis factor α reversibly diminished Wnt5a expression and secretion, respectively. Wnt5a decreased gene expression of differentiation markers and mineralization in cultured chondrocytes and reduced alkaline phosphatase activity in Achilles tendon enthesis (-14%) and osteocalcin protein levels released by ankle explants (-36%). On the contrary, Wnt5a stimulated ossification markers' expression in cultured osteoblasts and increased the bone volume of the tibial plateau of the cultured explants (+19%). In conclusion, our results suggest that Wnt5a is expressed locally in the joints of patients with SpA. Wnt5a appears more associated with ossification than with inflammation and tends to inhibit mineralization in chondrocytes and enthesis, whereas it seems to favor the ossification process in osteoblasts and bone. Further studies are needed to decipher the opposing effects observed locally in enthesis and systemically in bone in SpA.
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Affiliation(s)
- Carole Bougault
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université Claude Bernard-Lyon 1, Université de Lyon, UMR CNRS 5246, Villeurbanne, France.
| | - Anne Briolay
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université Claude Bernard-Lyon 1, Université de Lyon, UMR CNRS 5246, Villeurbanne, France
| | - Marie-Astrid Boutet
- Physiopathologie de la Résorption Osseuse et Thérapie des Tumeurs Osseuses Primitives, Université de Nantes, INSERM, UMR957, Nantes, France
| | - Paul Pilet
- Laboratoire d'ingénierie ostéoarticulaire et dentaire, INSERM, UMRS 791, Nantes, France
| | - Séverine Delplace
- Physiopathology of Inflammatory Bone Diseases, Université du Littoral-Côte d'Opale, EA 4490, Boulogne-sur-Mer, France
| | - Benoît Le Goff
- Physiopathologie de la Résorption Osseuse et Thérapie des Tumeurs Osseuses Primitives, Université de Nantes, INSERM, UMR957, Nantes, France; Department of Rheumatology, Hôtel-Dieu, CHU de Nantes, Nantes, France
| | - Jérôme Guicheux
- Laboratoire d'ingénierie ostéoarticulaire et dentaire, INSERM, UMRS 791, Nantes, France; UFR Odontologie, Université de Nantes, Nantes, France; PHU4 OTONN, CHU de Nantes, Nantes, France
| | - Frédéric Blanchard
- Physiopathologie de la Résorption Osseuse et Thérapie des Tumeurs Osseuses Primitives, Université de Nantes, INSERM, UMR957, Nantes, France
| | - David Magne
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Université Claude Bernard-Lyon 1, Université de Lyon, UMR CNRS 5246, Villeurbanne, France
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Gaspar D, Spanoudes K, Holladay C, Pandit A, Zeugolis D. Progress in cell-based therapies for tendon repair. Adv Drug Deliv Rev 2015; 84:240-56. [PMID: 25543005 DOI: 10.1016/j.addr.2014.11.023] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 11/08/2014] [Accepted: 11/12/2014] [Indexed: 02/07/2023]
Abstract
The last decade has seen significant developments in cell therapies, based on permanently differentiated, reprogrammed or engineered stem cells, for tendon injuries and degenerative conditions. In vitro studies assess the influence of biophysical, biochemical and biological signals on tenogenic phenotype maintenance and/or differentiation towards tenogenic lineage. However, the ideal culture environment has yet to be identified due to the lack of standardised experimental setup and readout system. Bone marrow mesenchymal stem cells and tenocytes/dermal fibroblasts appear to be the cell populations of choice for clinical translation in equine and human patients respectively based on circumstantial, rather than on hard evidence. Collaborative, inter- and multi-disciplinary efforts are expected to provide clinically relevant and commercially viable cell-based therapies for tendon repair and regeneration in the years to come.
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Affiliation(s)
- Diana Gaspar
- Network of Excellence for Functional Biomaterials (NFB), National University of Ireland, Galway (NUI Galway), Galway, Ireland
| | - Kyriakos Spanoudes
- Network of Excellence for Functional Biomaterials (NFB), National University of Ireland, Galway (NUI Galway), Galway, Ireland
| | - Carolyn Holladay
- Network of Excellence for Functional Biomaterials (NFB), National University of Ireland, Galway (NUI Galway), Galway, Ireland
| | - Abhay Pandit
- Network of Excellence for Functional Biomaterials (NFB), National University of Ireland, Galway (NUI Galway), Galway, Ireland
| | - Dimitrios Zeugolis
- Network of Excellence for Functional Biomaterials (NFB), National University of Ireland, Galway (NUI Galway), Galway, Ireland.
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14
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Zhang Y, Wang X, Qiu Y, Cornish J, Carr AJ, Xia Z. Effect of indomethacin and lactoferrin on human tenocyte proliferation and collagen formation in vitro. Biochem Biophys Res Commun 2014; 454:301-7. [PMID: 25450393 DOI: 10.1016/j.bbrc.2014.10.061] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 10/13/2014] [Indexed: 10/24/2022]
Abstract
Non-steroidal anti-inflammatory drugs (NSAIDs) are widely used in patients with injuries and inflammation of tendon and ligament, and as post-surgical analgesics. The aim of this study is to investigate the effect of indomethacin, a classic NSAID and its combinational effect with an anabolic agent of skeletal tissue, lactoferrin, on the proliferation and collagen formation of human tenocytes in vitro. A factorial experimental design was employed to study the dose-dependent effect of the combination of indomethacin and lactoferrin. The results showed that indomethacin at high concentration (100 μM) inhibited human tenocyte proliferation in culture medium with 1-10% fetal bovine serum (FBS) in vitro. Also, high dose of indomethacin inhibited the collagen formation of human tenocytes in 1% FBS culture medium. Lactoferrin at 50-100 μg/ml promoted human tenocyte survival in serum-free culture medium and enhanced proliferation and collagen synthesis of human tenocytes in 1% FBS culture medium. When 50-100 μg/ml lactoferrin was used in combination with 100-200 μM indomethacin, it partially rescued the inhibitory effects of indomethacin on human tenocyte proliferation, viability and collagen formation. To our knowledge, it is the first evidence that lactoferrin is anabolic to human tenocytes in vitro and reverses potential inhibitory effects of NSAIDs on human tenocytes.
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Affiliation(s)
- Yaonan Zhang
- Centre for Nanohealth, College of Medicine, Swansea University, Singleton Park, Swansea, UK SA2 8PP; Department of Orthopaedic, Beijing Hospital of Ministry of Public Health, Beijing, China 100730
| | - Xiao Wang
- Centre for Nanohealth, College of Medicine, Swansea University, Singleton Park, Swansea, UK SA2 8PP
| | - Yiwei Qiu
- Centre for Nanohealth, College of Medicine, Swansea University, Singleton Park, Swansea, UK SA2 8PP
| | - Jillian Cornish
- Department of Medicine, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Andrew J Carr
- Centre for Nanohealth, College of Medicine, Swansea University, Singleton Park, Swansea, UK SA2 8PP
| | - Zhidao Xia
- Centre for Nanohealth, College of Medicine, Swansea University, Singleton Park, Swansea, UK SA2 8PP.
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15
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Su B, O'Connor JP. NSAID therapy effects on healing of bone, tendon, and the enthesis. J Appl Physiol (1985) 2013; 115:892-9. [PMID: 23869068 DOI: 10.1152/japplphysiol.00053.2013] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Nonsteroidal anti-inflammatory drugs (NSAIDs) are commonly used for the treatment of skeletal injuries. The ability of NSAIDs to reduce pain and inflammation is well-established. However, the effects of NSAID therapy on healing of skeletal injuries is less defined. NSAIDs inhibit cyclooxygenase activity to reduce synthesis of prostaglandins, which are proinflammatory, lipid-signaling molecules. Inhibition of cyclooxygenase activity can impact many physiological processes. The effects of NSAID therapy on healing of bone, tendon, and the tendon-to-bone junction (enthesis) have been studied in animal and cell culture models, but human studies are few. Use of different NSAIDs with different pharmacological properties, differences in dosing regimens, and differences in study models and outcome measures have complicated comparisons between studies. In this review, we summarize the mechanisms by which bone, tendon, and enthesis healing occurs, and describe the effects of NSAID therapy on each of these processes. Determining the impact of NSAID therapy on healing of skeletal tissues will enable clinicians to appropriately manage the patient's condition and improve healing outcomes.
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Affiliation(s)
- Bailey Su
- Rutgers, the State University of New Jersey, New Jersey Medical School, Department of Biochemistry and Molecular Biology, Newark, New Jersey
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16
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Rampersad SN, Teelucksingh LD. Differential Responses of Colletotrichum gloeosporioides and C. truncatum Isolates from Different Hosts to Multiple Fungicides Based on Two Assays. PLANT DISEASE 2012; 96:1526-1536. [PMID: 30727340 DOI: 10.1094/pdis-10-11-0906-re] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Anthracnose is one of the most important postharvest diseases of many economically important crops worldwide. This study was conducted with the objective of investigating the sensitivity of Colletotrichum gloeosporioides and C. truncatum isolates to multiple fungicides with different modes of action. The study analyzed quantitative sensitivity data derived from conventional amended agar (AA) assays and qualitative spore responses obtained from a novel microtiter bioassay that is based on reduction of a viability dye, Alamar blue (AB). Generally, for AA assays, the percent growth inhibition (%RGI) increased with increasing concentration for all isolates and all fungicides, except for copper hydroxide. C. truncatum isolates reacted differently to increasing concentrations of the various fungicides depending on whether the isolates originated from pepper or papaya. C. truncatum from pepper had generally less %RGI than C. truncatum isolates from papaya. C. gloeosporioides isolates from papaya had generally higher %RGI than C. truncatum isolates for all concentrations tested for pyraclostrobin, chlorothalonil, and fosetyl-aluminum. C. gloeosporioides isolates from pepper had generally higher %RGI than C. truncatum isolates for all concentrations tested for most fungicides. In all cases, Colletotrichum sp. and fungicide had significant (P ≤ 0.001) effects on the log concentration of fungicide for which relative growth was inhibited by 50 and 90% (log EC50 and log EC90, respectively) calculated for all isolates, regardless of whether values were compared for only C. gloeosporioides isolates or only C. truncatum isolates. Correlation analyses of log EC50 and log EC90 values of all the isolates revealed a nonsignificant association for pyraclostrobin. In AB assays, all fungicides had an equivalent effect at inhibiting spore germination at the lower concentrations. According to binary logistic regression analyses, species, isolate, and fungicide concentration had significant predictive value in determining whether an AB test would be positive. Sequence alignments between C. gloeosporioides isolates and C. gloeosporioides f. sp. aeschynomene revealed no base substitutions at codons 198, 199, 200, and 240; however, sequence comparisons between C. truncatum isolates and C. gloeosporioides f. sp. aeschynomene revealed two codon changes located outside of the identified codon 198 or 200 associated with the benzimidazole-resistant phenotype of C. gloeosporioides isolates.
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Affiliation(s)
- Sephra N Rampersad
- The University of the West Indies, Department of Life Sciences, Faculty of Science and Agriculture, St. Augustine, Trinidad and Tobago, West Indies
| | - Lisa D Teelucksingh
- The University of the West Indies, Department of Life Sciences, Faculty of Science and Agriculture, St. Augustine, Trinidad and Tobago, West Indies
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17
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Rampersad SN. Multiple applications of Alamar Blue as an indicator of metabolic function and cellular health in cell viability bioassays. SENSORS (BASEL, SWITZERLAND) 2012; 12:12347-60. [PMID: 23112716 PMCID: PMC3478843 DOI: 10.3390/s120912347] [Citation(s) in RCA: 598] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 08/21/2012] [Accepted: 08/31/2012] [Indexed: 02/07/2023]
Abstract
Accurate prediction of the adverse effects of test compounds on living systems, detection of toxic thresholds, and expansion of experimental data sets to include multiple toxicity end-point analysis are required for any robust screening regime. Alamar Blue is an important redox indicator that is used to evaluate metabolic function and cellular health. The Alamar Blue bioassay has been utilized over the past 50 years to assess cell viability and cytotoxicity in a range of biological and environmental systems and in a number of cell types including bacteria, yeast, fungi, protozoa and cultured mammalian and piscine cells. It offers several advantages over other metabolic indicators and other cytotoxicity assays. However, as with any bioassay, suitability must be determined for each application and cell model. This review seeks to highlight many of the important considerations involved in assay use and design in addition to the potential pitfalls.
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Affiliation(s)
- Sephra N Rampersad
- Department of Life Sciences, The University of the West Indies, West Indies, St Augustine, Trinidad and Tobago.
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Abstract
The characteristic cells in tendons and ligaments are called tenocytes, which are responsible for the formation and turnover of the extracellular matrix. They react to external stimuli and facilitate the functional adaptation of the proteoglycan and collagen network to mechanical requirements. Via numerous cellular processes they form a complex communicating network which demonstrates coordinated directional reactions. As is common to all tissues in the human body, tendons are subject to age changes which influence the tenocytes, but additionally the structural organization and hence the function of the extracellular matrix. The function and organization of tendons are also affected by mechanical forces, as well as by various cytokines produced in the tissue and by the application of anti-inflammatory medication.
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