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Makled S, Abbas H, Ali ME, Zewail M. Melatonin hyalurosomes in collagen thermosensitive gel as a potential repurposing approach for rheumatoid arthritis management via the intra-articular route. Int J Pharm 2024; 661:124449. [PMID: 38992734 DOI: 10.1016/j.ijpharm.2024.124449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 06/30/2024] [Accepted: 07/07/2024] [Indexed: 07/13/2024]
Abstract
Despite the fact that several rheumatoid arthritis treatments have been utilized, none of them achieved complete joint healing and has been accompanied by several side effects that compromise patient compliance. This study aims to provide an effective safe RA treatment with minimum side effects through the encapsulation of melatonin (MEL) in hyalurosomes and loading these hyalurosomes in collagen thermos-sensitive poloxamer 407 (PCO) hydrogels, followed by their intra-articular administration in AIA model rats. In vitro characterization of MEL-hyalurosomes and PCO hydrogel along with in vivo evaluation of the selected formulation were conducted. Particle size, PDI and EE % of the selected formulation were 71.5 nm, 0.09 and 90 %. TEM micrographs demonstrated that the particles had spherical shape with no aggregation signs. Loading PCO hydrogels with MEL-hyalurosomes did not cause significant changes in pH although it increased its viscosity and injection time. FTIR analysis showed that no interactions were noted among the delivery system components. In vivo results revealed the superior effect of MEL-hyalurosomes PCO hydrogel over MEL-PCO hydrogel and blank PCO hydrogels in improving joint healing, cartilage repair, pannus formation and cell infiltrations. Also, MEL-hyalurosomes PCO hydrogel group showed comparable levels of TNF-α, IL1, MDA, NRF2 and HO-1 with the negative control group. These findings highlight the MEL encapsulation role in augmenting its pharmacological effects along with the synergistic effect of hyaluronic acid in hyalurosomes and collagen in PCO hydrogel in promoting joint healing.
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Affiliation(s)
- Shaimaa Makled
- Department of Pharmaceutics, Faculty of Pharmacy, Alexandria University, 21521, Egypt
| | - Haidy Abbas
- Department of Pharmaceutics, Faculty of Pharmacy, Damanhour University, Egypt P.O. Box 22511, Damanhour, Egypt.
| | - Merhan E Ali
- Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
| | - Mariam Zewail
- Department of Pharmaceutics, Faculty of Pharmacy, Damanhour University, Egypt P.O. Box 22511, Damanhour, Egypt
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Kamran G, Kharl HAA, Malik MNH, Younis W, Nadeem H, Zubair AM, Malik MAH, Jahan S, Ahmed I, Shabbir R, Akram A, Anjum I, Atif M, Raza M, Kamla GEZ. Novel mannich-based derivative of 2-mercaptobenzimidazole (AK7): a new candidate for the treatment of inflammatory arthritis owing to its NF-κB1 inhibitory potential. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2023; 396:811-827. [PMID: 36512053 DOI: 10.1007/s00210-022-02359-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 11/30/2022] [Indexed: 12/15/2022]
Abstract
This study investigated the anti-arthritic potential of novel mannich-based derivatives of 2-mercaptobenzimidazole (AK7 and AK9) in rats. The compounds were characterized by NMR and FTIR spectroscopies and their acute anti-inflammatory effects were measured by carrageenan (CRG)-induced paw edema model. The most potent doses of AK7 and AK9 were subsequently evaluated in the complete Freund's adjuvant (CFA)-induced inflammatory arthritis model. AK7 and AK9 inhibited CRG-induced inflammation in a dose-dependent fashion and a similar reduction in CFA-induced paw inflammation was observed. Moreover, X-ray and histopathological analyses of AK7-treated animals displayed normal joint structure whereas AK9, despite of its anti-inflammatory effects, failed to protect against cartilage destruction. Interestingly, biochemical analysis revealed a better safety profile for AK7 than for AK9 and methotrexate. Both compounds suppressed mRNA levels of pro-inflammatory mediators (IRAK1, NF-κB1, TNF-α, IL1B) while only AK7 reduced the transcript levels of interstitial collagenase (MMP1). Molecular docking analysis of AK7 and AK9 with TNF-α and MMP1 also supported the experimental data. These findings clearly highlight the beneficial effects of AK7 in the prevention and/or treatment of inflammatory arthritis.
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Affiliation(s)
- Gagun Kamran
- Department of Pharmacology, Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
| | - Hafiz Amir Ali Kharl
- Riphah Institute of Pharmaceutical Sciences, Riphah International University, Islamabad, Pakistan
| | | | - Waqas Younis
- Department of Pharmacology, Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
| | - Humaira Nadeem
- Riphah Institute of Pharmaceutical Sciences, Riphah International University, Islamabad, Pakistan
| | - Aymun Madni Zubair
- Department of Pharmacology, Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
| | | | - Shah Jahan
- Department of Immunology, University of Health Sciences, Lahore, Pakistan
| | - Ishtiaq Ahmed
- Department of Pathobiology, University of Veterinary and Animal Sciences (Jhang Campus), Lahore, Pakistan
| | - Ramla Shabbir
- Department of Pharmacology, Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
| | - Asma Akram
- Department of Orthopedics, Govt Khawaja Muhammad Safdar Medical College, Sialkot, Pakistan
| | - Irfan Anjum
- Department of Pharmacology, Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
| | - Muhammad Atif
- Department of Pharmacology, Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
| | - Moosa Raza
- Department of Pharmacology, Faculty of Pharmacy, The University of Lahore, Lahore, Pakistan
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Induced Models of Osteoarthritis in Animal Models: A Systematic Review. BIOLOGY 2023; 12:biology12020283. [PMID: 36829562 PMCID: PMC9953428 DOI: 10.3390/biology12020283] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 02/05/2023] [Accepted: 02/06/2023] [Indexed: 02/15/2023]
Abstract
The most common induction methods for OA are mechanical, surgical and chemical. However, there is not a gold standard in the choice of OA animal models, as different animals and induction methods are helpful in different contexts. Reporting the latest evidence and results in the literature could help researchers worldwide to define the most appropriate indication for OA animal-model development. This review aims to better define the most appropriate animal model for various OA conditions. The research was conducted on the following literature databases: Medline, Embase, Cinahl, Scopus, Web of Science and Google Scholar. Studies reporting cases of OA in animal models and their induction from January 2010 to July 2021 were included in the study and reviewed by two authors. The literature search retrieved 1621 articles, of which 36 met the selection criteria and were included in this review. The selected studies included 1472 animals. Of all the studies selected, 8 included information about the chemical induction of OA, 19 were focused on mechanical induction, and 9 on surgical induction. Nevertheless, it is noteworthy that several induction models, mechanical, surgical and chemical, have been proven suitable for the induction of OA in animals.
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Mélou C, Pellen-Mussi P, Jeanne S, Novella A, Tricot-Doleux S, Chauvel-Lebret D. Osteoarthritis of the Temporomandibular Joint: A Narrative Overview. MEDICINA (KAUNAS, LITHUANIA) 2022; 59:medicina59010008. [PMID: 36676632 PMCID: PMC9866170 DOI: 10.3390/medicina59010008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/14/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022]
Abstract
Background and Objectives: This study reviewed the literature to summarize the current and recent knowledge of temporomandibular joint osteoarthritis (TMJOA). Methods: Through a literature review, this work summarizes many concepts related to TMJOA. Results: Although many signaling pathways have been investigated, the etiopathogenesis of TMJOA remains unclear. Some clinical signs are suggestive of TMJOA; however, diagnosis is mainly based on radiological findings. Treatment options include noninvasive, minimally invasive, and surgical techniques. Several study models have been used in TMJOA studies because there is no gold standard model. Conclusion: More research is needed to develop curative treatments for TMJOA, which could be tested with reliable in vitro models, and to explore tissue engineering to regenerate damaged temporomandibular joints.
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Affiliation(s)
- Caroline Mélou
- CNRS, ISCR (Institut des Sciences Chimiques de Rennes), University Rennes, UMR 6226, 35000 Rennes, France
- CHU Rennes, Pôle d’Odontologie, 35033 Rennes, France
- UFR Odontologie, 35043 Rennes, France
| | - Pascal Pellen-Mussi
- CNRS, ISCR (Institut des Sciences Chimiques de Rennes), University Rennes, UMR 6226, 35000 Rennes, France
| | - Sylvie Jeanne
- CNRS, ISCR (Institut des Sciences Chimiques de Rennes), University Rennes, UMR 6226, 35000 Rennes, France
- CHU Rennes, Pôle d’Odontologie, 35033 Rennes, France
- UFR Odontologie, 35043 Rennes, France
| | - Agnès Novella
- CNRS, ISCR (Institut des Sciences Chimiques de Rennes), University Rennes, UMR 6226, 35000 Rennes, France
| | - Sylvie Tricot-Doleux
- CNRS, ISCR (Institut des Sciences Chimiques de Rennes), University Rennes, UMR 6226, 35000 Rennes, France
| | - Dominique Chauvel-Lebret
- CNRS, ISCR (Institut des Sciences Chimiques de Rennes), University Rennes, UMR 6226, 35000 Rennes, France
- CHU Rennes, Pôle d’Odontologie, 35033 Rennes, France
- UFR Odontologie, 35043 Rennes, France
- Correspondence: ; Tel.: +33-2-23-23-43-64; Fax: +33-2-23-23-43-93
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Yang D, Hu W, Li H, Shao YC, Shan JC, Xiong X, Shuang F. Establishment of a bipedal rat model of lumbar facet joint osteoarthritis using intraarticular injection of urinary plasminogen activator. J Orthop Surg Res 2022; 17:447. [PMID: 36224572 PMCID: PMC9555121 DOI: 10.1186/s13018-022-03339-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 09/25/2022] [Indexed: 11/26/2022] Open
Abstract
Background Previous studies have demonstrated that by injecting uPA into the lumbar facet joints (LFJ) of normal rats, a rat LFJOA animal model can be successfully established. However, there is no evidence that intraarticular injection of uPA can induce or much serious osteoarthritis in bipedal rats, which biomechanics is much more similar to human than normal rats. To investigate whether intraarticular injection of urinary plasminogen activator (uPA) can induce LFJOA and low back pain symptoms in bipedal rats. Methods An experimental study on the construction of a modified animal model of lumbar facet joints osteoarthritis (LFJOA) which biomechanics is similar to human. Sprague–Dawley rats were treated with intraarticular injection of uPA in the L5–L6 facet joints (uPA group, n = 15) or saline (saline group, n = 15). The forelimbs of both two group rats were amputated. Mechanical and thermal hyperalgesia in the ipsilateral hind paws were evaluated using von Frey hairs and a thermoalgesia instrument, respectively. Toluidine blue staining, hematoxylin–eosin staining, and immunohistochemical examination of the LFJ was performed. Results The saline group rats have not demonstrated significant osteoarthritis in rats LFJ after surgery. The uPA group has not been induced significantly higher mechanical and thermal hyperalgesia in comparison with the saline group. But intraarticular injection of uPA in biped rats induced significantly stronger articular cartilage damage, synovitis, and proliferation of synovial cells in the LFJ. Inflammatory factors such as iNOS, IL-1β, and TNF-a were more significantly expressed in bipedal rat injected with uPA (p < 0.05). Conclusions Intraarticular injection of uPA can induce LFJOA in bipedal rats, while upright posture does not induce osteoarthritis in rats LFJ in the short term.
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Affiliation(s)
- Di Yang
- Department of Orthopedics, The 908th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army, No.1028 Jinggangshan Street, Qingyunpu District, Nanchang, 330002, Jiangxi Province, China
| | - Wei Hu
- Department of Orthopedics, The 908th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army, No.1028 Jinggangshan Street, Qingyunpu District, Nanchang, 330002, Jiangxi Province, China
| | - Hao Li
- Department of Orthopedics, The 908th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army, No.1028 Jinggangshan Street, Qingyunpu District, Nanchang, 330002, Jiangxi Province, China
| | - Yin-Chu Shao
- Department of Orthopedics, The 908th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army, No.1028 Jinggangshan Street, Qingyunpu District, Nanchang, 330002, Jiangxi Province, China
| | - Ji-Chun Shan
- Department of Orthopedics, The 908th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army, No.1028 Jinggangshan Street, Qingyunpu District, Nanchang, 330002, Jiangxi Province, China
| | - Xu Xiong
- Department of Orthopedics, The 908th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army, No.1028 Jinggangshan Street, Qingyunpu District, Nanchang, 330002, Jiangxi Province, China
| | - Feng Shuang
- Department of Orthopedics, The 908th Hospital of Joint Logistics Support Force of Chinese People's Liberation Army, No.1028 Jinggangshan Street, Qingyunpu District, Nanchang, 330002, Jiangxi Province, China.
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BAG3 protects chondrocytes against lumbar facet joint osteoarthritis by regulating autophagy and apoptosis. J Physiol Biochem 2022; 78:427-437. [DOI: 10.1007/s13105-021-00865-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 12/14/2021] [Indexed: 11/30/2022]
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Klahsen O, Clark AL, Brown SHM. Investigating how combined multifidus injury and facet joint compression influence changes in surrounding muscles and facet degeneration in the rat. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2021; 30:2613-2621. [PMID: 34050807 DOI: 10.1007/s00586-021-06877-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 05/10/2021] [Accepted: 05/13/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE To examine whether unilateral multifidus damage could promote degeneration at the L5-6 facet joint (FJ) and compensatory changes in lumbo-pelvic muscles in rats. METHODS 12 facet clamp, 12 facet sham and 7 control rats were studied. Facet clamp and sham animals had the left L5-6 FJ exposed, and the clamp group had a mild compressive clamp applied using hemostatic forceps to model post-traumatic arthritis. Both groups then had the left multifidus detached from the L1-L6 spinous processes. Animals were euthanized 28 days post-surgery. Muscle mass and fascicle length were evaluated bilaterally for the paraspinal muscles, gluteal muscles and biceps femoris. Intra-muscular collagen of the paraspinal muscles was measured histologically. FJ transverse plane angles were measured from micro-computed tomography scans. L5-6 FJ degeneration was evaluated through the 24-point OARSI scale. RESULTS Differences, compared to control, were observed in the detached multifidus from both facet clamp and sham groups; namely decreased mass and fascicle length and increased collagen content. However, no between group differences were found for any other muscle. Further, mild FJ degeneration was more prevalent in the groups that had experienced multifidus injury but was not exacerbated by the mild compressive clamping of the FJ. CONCLUSION Unilateral multifidus injury with or without FJ compressive clamping does not have a clear impact on the characteristics of surrounding spinal musculature within 28 days post-surgery in rats. Mild FJ degeneration was present in some animals from all three groups, and the impact of multifidus injury on this degeneration is inconclusive.
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Affiliation(s)
- Olena Klahsen
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
| | - Andrea L Clark
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada
| | - Stephen H M Brown
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada.
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Lu Y, Pei S, Hou S. Development of a novel rat model of lumbar facet joint osteoarthritis induced by persistent compressive injury. Exp Ther Med 2020; 20:3740-3748. [PMID: 32855725 PMCID: PMC7444380 DOI: 10.3892/etm.2020.9117] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 03/06/2020] [Indexed: 12/16/2022] Open
Abstract
The aim of the present study was to develop a novel animal model of lumbar facet joint osteoarthritis induced by persistent compressive injury. An intraspinal compression spring was randomly implanted into either the L4/5 or the L5/6 spinal segments of 40 Sprague Dawley (SD) rats to induce compression. Sham-operations were used in the other segment of the same rats as the control levels. The animals were sacrificed at 7, 14, 28, 42 and 56 days after surgery, prior to the radiological confirmation of the spring location. Degeneration of the lumbar facet joints was evaluated by macroscopic observation in addition to histological and immunohistological analyses. The results of this present study revealed the absence of spring dislocation during the entire observation period. Macroscopic and Osteoarthritis Research Society International scores of the compression levels were found to be higher in the compression levels compared with those noted in the control levels (P<0.05). In addition, interleukin-1β and tumor necrosis factor-α expression in the compression levels were increased over time compared with those recorded in the control levels. In conclusion, persistent compressive injury may induce degeneration of the lumbar facet joint. This novel animal model could serve as a useful tool for further studies into the mechanisms of action and potential treatment of lumbar facet joint osteoarthritis.
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Affiliation(s)
- You Lu
- Department of Orthopaedics, Chinese PLA Medical School, Beijing 100853, P.R. China.,Department of Orthopaedics, Sixth Medical Center of PLA General Hospital, Beijing 100048, P.R. China
| | - Shishen Pei
- Department of Orthopaedics, The Fourth People's Hospital of Hengshui City, Hengshui, Hebei 053000, P.R. China
| | - Shuxun Hou
- Department of Orthopaedics, Chinese PLA Medical School, Beijing 100853, P.R. China.,Department of Orthopaedics, Fourth Medical Center of PLA General Hospital, Beijing 100048, P.R. China
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Sperry MM, Ita ME, Kartha S, Zhang S, Yu YH, Winkelstein B. The Interface of Mechanics and Nociception in Joint Pathophysiology: Insights From the Facet and Temporomandibular Joints. J Biomech Eng 2017; 139:2597611. [PMID: 28056123 DOI: 10.1115/1.4035647] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Indexed: 12/16/2022]
Abstract
Chronic joint pain is a widespread problem that frequently occurs with aging and trauma. Pain occurs most often in synovial joints, the body's load bearing joints. The mechanical and molecular mechanisms contributing to synovial joint pain are reviewed using two examples, the cervical spinal facet joints and the temporomandibular joint (TMJ). Although much work has focused on the macroscale mechanics of joints in health and disease, the combined influence of tissue mechanics, molecular processes, and nociception in joint pain has only recently become a focus. Trauma and repeated loading can induce structural and biochemical changes in joints, altering their microenvironment and modifying the biomechanics of their constitutive tissues, which themselves are innervated. Peripheral pain sensors can become activated in response to changes in the joint microenvironment and relay pain signals to the spinal cord and brain where pain is processed and perceived. In some cases, pain circuitry is permanently changed, which may be a potential mechanism for sustained joint pain. However, it is most likely that alterations in both the joint microenvironment and the central nervous system (CNS) contribute to chronic pain. As such, the challenge of treating joint pain and degeneration is temporally and spatially complicated. This review summarizes anatomy, physiology, and pathophysiology of these joints and the sensory pain relays. Pain pathways are postulated to be sensitized by many factors, including degeneration and biochemical priming, with effects on thresholds for mechanical injury and/or dysfunction. Initiators of joint pain are discussed in the context of clinical challenges including the diagnosis and treatment of pain.
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Affiliation(s)
- Megan M Sperry
- Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33rd Street, Philadelphia, PA 19104-6321 e-mail:
| | - Meagan E Ita
- Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33rd Street, Philadelphia, PA 19104-6321 e-mail:
| | - Sonia Kartha
- Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33rd Street, Philadelphia, PA 19104-6321 e-mail:
| | - Sijia Zhang
- Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33rd Street, Philadelphia, PA 19104-6321 e-mail:
| | - Ya-Hsin Yu
- Department of Endodontics, School of Dental Medicine, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33rd Street, Philadelphia, PA 19104-6321 e-mail:
| | - Beth Winkelstein
- Departments of Bioengineering and Neurosurgery, University of Pennsylvania, 240 Skirkanich Hall, 210 S. 33rd Street, Philadelphia, PA 19104-6321 e-mail:
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Establishment of a rat model of lumbar facet joint osteoarthritis using intraarticular injection of urinary plasminogen activator. Sci Rep 2015; 5:9828. [PMID: 25892493 PMCID: PMC4402705 DOI: 10.1038/srep09828] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Accepted: 03/20/2015] [Indexed: 12/16/2022] Open
Abstract
Lumbar facet joint (LFJ) osteoarthritis (OA) is an important etiology of low back pain. Several animal models of LFJ OA have been established using intraarticular injection of various chemicals. This study aimed to establish a rat model of LFJ OA using urinary plasminogen activator (uPA). Sprague-Dawley rats were treated with intraarticular injection in the L5-L6 facet joints with uPA (OA group, n = 40) or normal saline (vehicle group, n = 40). Mechanical and thermal hyperalgesia in the ipsilateral hind paws were evaluated using von Frey hairs and a thermoalgesia instrument, respectively. Toluidine blue staining, hematoxylin-eosin staining, and immunohistochemical examination of the LFJ was performed. Treatment with uPA induced cartilage damage, synovitis, and proliferation of synovial cells in the fact joints. The OA group showed significantly higher hyperalgesia in the hind paws in comparison with the vehicle group and normal controls (P < 0.05). Expression of IL-1β, TNF-α, and iNOS in the LFJ cartilage in the OA group was significantly increased (P < 0.05). A rat model of LFJ OA was successfully established using intraarticular injection of uPA. This animal model is convenient and shows good resemblance to human OA pathology.
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