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Flannery CR, Buddin KE, Begum L, Nasert MA, Catalfamo B, Semler EJ, Fortier LA. Composition and Bioactivity of a Placental Tissue Particulate (PTP-001) Indicate Greater Potential than Platelet-Rich Plasma for the Treatment of Osteoarthritis. Cartilage 2023; 14:467-472. [PMID: 36912174 PMCID: PMC10807739 DOI: 10.1177/19476035231159748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 01/23/2023] [Accepted: 02/09/2023] [Indexed: 03/14/2023] Open
Abstract
OBJECTIVE This study was conducted to compare therapeutically relevant properties of platelet-rich plasma (PRP), a commonly used autologous intra-articular treatment for osteoarthritis (OA), with those of a novel placental tissue particulate, PTP-001, which is in development as a regulated biologic treatment for knee OA. DESIGN Quantitative immunoassays were performed to determine the content of key growth/regulatory biofactors in PTP-001, and in leukocyte-rich (LR)-PRP or leukocyte-poor (LP)-PRP. An anti-inflammatory bioassay was used to evaluate the effects of each treatment on pro-inflammatory cytokine (tumor necrosis factor (TNF)-α) production in a macrophage cell culture system. Gene expression experiments were conducted using a co-culture system of human synoviocytes (pre-stimulated with interleukin (IL)-1β) and articular chondrocytes, with quantitative polymerase chain reaction analyses of the separate cellular compartments. RESULTS The concentrations of several biofactors (e.g., basic fibroblast growth factor, tissue inhibitor of metalloproteases-3, interleukin-1 receptor antagonist) representative of diverse disease-relevant mechanisms of action were significantly higher for PTP-001 relative to LR-PRP or LP-PRP. PTP-001 and PRP preparations were able to reduce TNF-α production in macrophage cell cultures; however, greater variability was observed for PRP in comparison with PTP-001. In the chondrocyte/synoviocyte co-culture experiments, PTP-001 and LR-PRP (but not LP-PRP) significantly reduced chondrocyte MMP13 expression in cultures containing IL-1-pretreated synoviocytes. In addition, ADAMTS5 expression was reduced in the chondrocyte compartment following treatment with PTP-001 relative to PRP. CONCLUSION These findings support evidence of a potent, multifactorial mechanism of action for a consistently manufactured biologic (PTP-001), which may be of greater therapeutic benefit in comparison with more heterogeneous preparations of PRP which may be generated at the time of treatment.
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Keller LE, Tait Wojno ED, Begum L, Fortier LA. T Helper 17-Like Regulatory T Cells in Equine Synovial Fluid Are Associated With Disease Severity of Naturally Occurring Posttraumatic Osteoarthritis. Am J Sports Med 2023; 51:1047-1058. [PMID: 36794851 PMCID: PMC10375548 DOI: 10.1177/03635465231153588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
BACKGROUND Infiltration of cluster of differentiation (CD) 3+ (CD3+) T cells into the synovium and synovial fluid occurs in most patients with posttraumatic osteoarthritis. During disease progression, proinflammatory T helper 17 cells and anti-inflammatory regulatory T cells infiltrate the joint in response to inflammation. This study aimed to characterize the dynamics of regulatory T and T helper 17 cell populations in synovial fluid from equine clinical patients with posttraumatic osteoarthritis to determine whether phenotype and function are associated with potential immunotherapeutic targets. HYPOTHESIS An imbalance of the ratio of regulatory T cells and T helper 17 cells would be associated with disease progression in posttraumatic osteoarthritis, suggesting opportunities for immunomodulatory therapy. STUDY DESIGN Descriptive laboratory study. METHODS Synovial fluid was aspirated from the joints of equine clinical patients undergoing arthroscopic surgery for posttraumatic osteoarthritis resulting from intra-articular fragmentation. Joints were classified as having mild or moderate posttraumatic osteoarthritis. Synovial fluid was also obtained from nonoperated horses with normal cartilage. Peripheral blood was obtained from horses with normal cartilage and those with mild and moderate posttraumatic osteoarthritis. Synovial fluid and peripheral blood cells were analyzed by flow cytometry, and native synovial fluid was analyzed by enzyme-linked immunosorbent assay. RESULTS CD3+ T cells represented 81% of lymphocytes in synovial fluid, which increased in animals with moderate posttraumatic osteoarthritis to 88.3% (P = .02). CD14+ macrophages were doubled in those with moderate posttraumatic osteoarthritis compared with mild posttraumatic osteoarthritis and controls (P < .001). Less than 5% of CD3+ T cells found within the joint were forkhead box P3 protein+ (Foxp3+) regulatory T cells, but a 4- to 8-times higher percentage of nonoperated and mild posttraumatic osteoarthritis joint regulatory T cells secreted interleukin (IL)-10 than peripheral blood Tregs (P < .005). T regulatory-1 cells that secreted IL-10 but did not express Foxp3 accounted for approximately 5% of CD3+ T cells in all joints. T helper 17 cells and Th17-like regulatory T cells were increased in those with moderate posttraumatic osteoarthritis (P < .0001) compared with mild and nonoperated patients. IL-10, IL-17A, IL-6, chemokine (C-C motif) ligand (CCL) 2 (CCL2), and CCL5 concentrations detected by enzyme-linked immunosorbent assay in synovial fluid were not different between groups. CONCLUSIONS An imbalance of the ratio of regulatory T cells and T helper 17 cells and an increase in T helper 17 cell-like regulatory T cells in synovial fluid from joints with more severe disease provide novel insights into immunological mechanisms that are associated with posttraumatic osteoarthritis progression and pathogenesis. CLINICAL RELEVANCE Early and targeted use of immunotherapeutics in the mitigation of posttraumatic osteoarthritis may improve patient clinical outcomes.
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Affiliation(s)
- Laura E Keller
- Cornell University, College of Veterinary Medicine, Department of Clinical Sciences, Ithaca, New York, USA
| | - Elia D Tait Wojno
- University of Washington, Department of Immunology, Seattle, Washington, USA
| | - Laila Begum
- Cornell University, College of Veterinary Medicine, Department of Clinical Sciences, Ithaca, New York, USA
| | - Lisa A Fortier
- Cornell University, College of Veterinary Medicine, Department of Clinical Sciences, Ithaca, New York, USA
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Keller LE, Tait Wojno ED, Begum L, Fortier LA. Interleukin-6 neutralization and regulatory T cells are additive in chondroprotection from IL-1β-induced inflammation. J Orthop Res 2022; 41:942-950. [PMID: 36205183 PMCID: PMC10079781 DOI: 10.1002/jor.25453] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 08/25/2022] [Accepted: 10/01/2022] [Indexed: 02/04/2023]
Abstract
Anti-inflammatory Regulatory T cells (Tregs) are enriched in the joints of patients with osteoarthritis (OA) compared to healthy joints. Tregs maintain homeostasis through secretion of anti-inflammatory cytokines and cell-to-cell interactions including immune checkpoint signaling. Interleukin-6 (IL-6) is a pleiotropic cytokine secreted by inflamed synoviocytes and chondrocytes that can inhibit or alter Treg function. This study tested the hypothesis that neutralization of IL-6 would enable Treg anti-inflammatory function to resolve inflammation and catabolism elicited by IL-1β in an equine chondrocyte/synoviocyte/Treg tri-culture OA model. Synoviocyte/chondrocyte co-cultures were stimulated with IL-1β, and treated with αIL-6 neutralizing antibody. Activated Tregs secreting IL-10 were added in direct contact with synoviocytes to create a tri-culture. Neutralization of IL-6 partially restored Treg anti-inflammatory functions and, in combination, reduced IL-1β-stimulated synoviocyte MMP13 expression to control levels and restored Acan expression in chondrocytes. IL-6 neutralization alone decreased Il6 expression in chondrocytes and synoviocytes, mitigating IL-6 positive feedback loop. Although Tregs were the primary producers of anti-inflammatory IL-10 and IL-4, they also produced pro-inflammatory IL-17A, as detected by ELIA, which may have been responsible for incomplete rescue of synoviocyte/chondrocyte homeostasis following IL-1β stimulation. Treg secretion of IL-10, IL-4, and IL-17A was not altered by tri-culture conditions or presence of αIL-6, therefore, it was unlikely that Treg phenotype instability occurred. The significant effect of chondrocyte/synoviocyte donor, but not Treg donor, on gene expression and IL-6 concentration in conditioned media, indicated that personalized therapy considering the patient's OA status might be needed for successful implementation of immunotherapy in the context of OA.
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Affiliation(s)
- Laura E Keller
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
| | - Elia D Tait Wojno
- Department of Immunology, University of Washington, Seattle, Washington, USA
| | - Laila Begum
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
| | - Lisa A Fortier
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
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Hernandez SM, Begum L, Keller LE, Fu Q, Zhang S, Fortier LA. Synovium secretome as a disease-modifying treatment for equine osteoarthritis. Am J Vet Res 2022; 83:ajvr.22.05.0082. [PMID: 35986909 DOI: 10.2460/ajvr.22.05.0082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To identify chondroprotective factors as potential disease-modifying osteoarthritis treatments using an unbiased, bottom-up proteomics approach. SAMPLES Paired equine cartilage explants and synovial membrane were collected postmortem from 4 horses with no history of lameness and grossly normal joints at necropsy. PROCEDURES Six groups were established: cartilage, synoviocytes, and cartilage + synoviocytes (coculture), all with or without interleukin (IL)-1β. The catabolic effect of IL-1β was verified by glycosaminoglycan (GAG) released from cartilage into media by 1,9-dimethyl-methylene blue assay and cartilage toluidine blue histochemistry. Conditioned media from cocultures with or with IL-1β were submitted for bottom-up proteomic analysis. Synoviocyte gene expression was evaluated using reverse transcription-quantitative PCR (RT-qPCR) for proteins of interest identified in the proteomics scan. RESULTS GAG content was retained in cartilage when in cocultures treated with IL-1β. Fourteen proteins of interest were selected from the proteomic analysis. From these 14 proteins, metalloproteinase inhibitor 3 precursor (TIMP3), tumor necrosis factor receptor superfamily member 11B (TNFRSF11B), insulin-like growth factor-binding protein 2 (IGFBP2), and alpha-2 macroglobulin (A2M) were selected for synoviocyte gene expression analysis by RT-qPCR. Gene expression of TIMP3 (P = .02) and TNFRSF11B (P = .04) were significantly increased in synoviocytes from cocultures treated with IL-1β compared to controls. Contrary to expectations based on protein expression, IGFBP2 gene expression (P = .04) was significantly decreased in IL-1β-stimulated coculture synoviocytes compared to control coculture synoviocytes. A2M gene expression in synoviocytes was not different between coculture groups. CLINICAL RELEVANCE The secretome from synoviocytes could provide a milieu of bioactive factors to restore joint homeostasis in osteoarthritis.
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Affiliation(s)
| | - Laila Begum
- Department of Clinical Sciences, Cornell University, Ithaca, NY
| | - Laura E Keller
- Department of Clinical Sciences, Cornell University, Ithaca, NY
| | - Qin Fu
- Proteomics and Metabolomics Facility, Cornell University, Ithaca, NY
| | - Sheng Zhang
- Proteomics and Metabolomics Facility, Cornell University, Ithaca, NY
| | - Lisa A Fortier
- Department of Clinical Sciences, Cornell University, Ithaca, NY
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Flannery C, Buddin K, Begum L, Nasert M, Catalfamo B, Semler E, Fortier L. QUANTITATIVE COMPOSITIONAL AND BIOACTIVITY ANALYSES OF A NOVEL PLACENTAL TISSUE BIOLOGIC (PTP-001) COMPARED WITH PLATELET RICH PLASMA (PRP). Osteoarthritis Cartilage 2022. [DOI: 10.1016/j.joca.2022.02.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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Becktell L, Matuska AM, Hon S, Delco ML, Cole BJ, Begum L, Zhang S, Fortier LA. Proteomic Analysis and Cell Viability of Nine Amnion, Chorion, Umbilical Cord, and Amniotic Fluid-Derived Products. Cartilage 2021; 13:495S-507S. [PMID: 33356465 PMCID: PMC8804846 DOI: 10.1177/1947603520976767] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE Amnion products are used in various musculoskeletal surgeries and as injections for joint pain with conflicting reports of cell viability and protein contents. The objective of this study was to determine the full proteome and examine cell viability in 9 commercial amnion products using an unbiased bottom-up shotgun proteomics approach and confocal microscopy. DESIGN Products were subjected to liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis and searched against a UniProt Homo sapiens database. Relative protein abundance was determined for each sample. Based on proteomics results, lumican was measured by enzyme-linked immunosorbent assay (ELISA) and Western blot analysis was performed for interleukin-1 receptor antagonist (IL-1Ra) and tissue inhibitor of matrix metalloproteinase-2 (TIMP-2). Cell viability was determined by calcein AM (live) and ethidium homodimer (dead) staining and confocal microscopy. RESULTS Proteomic analysis revealed 919 proteins in the nine products. Proteins were primarily collagens, keratin, and albumin. Lumican, a small leucine-rich proteoglycan (SLRP) was found in all samples. Western blot analysis for IL-1Ra and TIMP-2 indicated presence of both proteins, with nonspecific antibody binding also present in all samples. No live cells were identified in any product. CONCLUSIONS Several novel proteins were identified through proteomics that might impart the beneficial effects of amnion products, including SLRPs, collagens, and regulators of fibroblast activity. IL-1Ra and TIMP-2 were identified, but concentrations measured by ELISA may be falsely increased due to nonspecific antibody binding. The concept that the amnion tissues provide live cells to aid in tissue regeneration cannot be supported by the findings of this study.
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Affiliation(s)
- Liliya Becktell
- College of Veterinary Medicine, Cornell
University, Ithaca, NY, USA
| | | | - Stephanie Hon
- College of Veterinary Medicine, Cornell
University, Ithaca, NY, USA
| | | | - Brian J. Cole
- Midwest Orthopedics at Rush, Rush
University Medical Center, Chicago, IL, USA
| | - Laila Begum
- College of Veterinary Medicine, Cornell
University, Ithaca, NY, USA
| | - Sheng Zhang
- Proteomics and Metabolomics Facility,
Institute of Biotechnology, Cornell University, Ithaca, NY, USA
| | - Lisa A. Fortier
- College of Veterinary Medicine, Cornell
University, Ithaca, NY, USA,Lisa A. Fortier, Department of Clinical
Sciences, College of Veterinary Medicine, Cornell University, 930 Campus Road,
Ithaca, NY 14853, USA.
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Keller LE, Tait Wojno ED, Begum L, Fortier LA. Regulatory T cells provide chondroprotection through increased TIMP1, IL-10 and IL-4, but cannot mitigate the catabolic effects of IL-1β and IL-6 in a tri-culture model of osteoarthritis. Osteoarthritis and Cartilage Open 2021; 3:100193. [DOI: 10.1016/j.ocarto.2021.100193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 07/11/2021] [Accepted: 07/12/2021] [Indexed: 01/19/2023] Open
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Nixon AJ, Grol MW, Lang HM, Ruan MZC, Stone A, Begum L, Chen Y, Dawson B, Gannon F, Plutizki S, Lee BHL, Guse K. Disease-Modifying Osteoarthritis Treatment With Interleukin-1 Receptor Antagonist Gene Therapy in Small and Large Animal Models. Arthritis Rheumatol 2018; 70:1757-1768. [PMID: 30044894 DOI: 10.1002/art.40668] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 07/10/2018] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Gene therapy holds great promise for the treatment of osteoarthritis (OA) because a single intraarticular injection can lead to long-term expression of therapeutic proteins within the joint. This study was undertaken to investigate the use of a helper-dependent adenovirus (HDAd)-mediated intraarticular gene therapy approach for long-term expression of interleukin-1 receptor antagonist (IL-1Ra) as sustained symptomatic and disease-modifying therapy for OA. METHODS In mouse models of OA, efficacy of HDAd-IL-1Ra was evaluated by histologic analysis, micro-computed tomography (micro-CT), and hot plate analysis. In a horse OA model, safety and efficacy of HDAd-IL-1Ra were evaluated by blood chemistry, analyses of synovial fluid, synovial membrane, and cartilage, and gross pathology and lameness assessments. RESULTS In skeletally immature mice, HDAd-IL-1Ra prevented development of cartilage damage, osteophytes, and synovitis. In skeletally immature and mature mice, treatment with HDAd-interleukin-1 receptor antagonist post-OA induction resulted in improved-albeit not significantly-cartilage status assessed histologically and significantly increased cartilage volume, cartilage surface, and bone surface covered by cartilage as assessed by micro-CT. Fewer osteophytes were observed in HDAd-IL-1Ra-treated skeletally immature mice. Synovitis was not affected in skeletally immature or mature mice. HDAd-IL-1Ra protected against disease-induced thermal hyperalgesia in skeletally mature mice. In the horse OA model, HDAd-IL-1Ra therapy significantly improved lameness parameters, indicating efficient symptomatic treatment. Moreover, macroscopically and histologically assessed cartilage and synovial membrane parameters were significantly improved, suggesting disease-modifying efficacy. CONCLUSION These data from OA models in small and large animals demonstrated safe symptomatic and disease-modifying treatment with an HDAd-expressing IL-1Ra. Furthermore, this study establishes HDAd as a vector for joint gene therapy.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Kilian Guse
- Baylor College of Medicine, Houston, Texas, and GeneQuine Biotherapeutics GmbH, Hamburg, Germany
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Ortved KF, Begum L, Stefanovski D, Nixon AJ. AAV-mediated Overexpression of IL-10 Mitigates the Inflammatory Cascade in Stimulated Equine Chondrocyte Pellets. Curr Gene Ther 2018; 18:171-179. [DOI: 10.2174/1566523218666180510165123] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 05/03/2018] [Accepted: 05/09/2018] [Indexed: 11/22/2022]
Affiliation(s)
- Kyla F. Ortved
- Department of Clinical Sciences, Cornell University, Ithaca, NY 14853, United States
| | - Laila Begum
- Department of Clinical Sciences, Cornell University, Ithaca, NY 14853, United States
| | - Darko Stefanovski
- Department of Clinical Studies, New Bolton Center, University of Pennsylvania, Kennett Square, PA 19348, United States
| | - Alan J. Nixon
- Department of Clinical Sciences, Cornell University, Ithaca, NY 14853, United States
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Nixon AJ, Sparks HD, Begum L, McDonough S, Scimeca MS, Moran N, Matthews GL. Matrix-Induced Autologous Chondrocyte Implantation (MACI) Using a Cell-Seeded Collagen Membrane Improves Cartilage Healing in the Equine Model. J Bone Joint Surg Am 2017; 99:1987-1998. [PMID: 29206788 DOI: 10.2106/jbjs.16.00603] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Autologous chondrocyte implantation (ACI) using a collagen scaffold (matrix-induced ACI; MACI) is a next-generation approach to traditional ACI that provides the benefit of autologous cells and guided tissue regeneration using a biocompatible collagen scaffold. The MACI implant also has inherent advantages including surgical implantation via arthroscopy or miniarthrotomy, the elimination of periosteal harvest, and the use of tissue adhesive in lieu of sutures. This study evaluated the efficacy of the MACI implant in an equine full-thickness cartilage defect model at 1 year. METHODS Autologous chondrocytes were seeded onto a collagen type-I/III membrane and implanted into one of two 15-mm defects in the femoral trochlear ridge of 24 horses. Control defects either were implanted with cell-free collagen type-I/III membrane (12 horses) or were left ungrafted as empty defects (12 horses). An additional 3 horses had both 15-mm defects remain empty as nonimplanted joints. The repair was scored by second-look arthroscopy (12 weeks), and necropsy examination (53 weeks). Healing was assessed by arthroscopic scoring, gross assessment, histology and immunohistology, cartilage matrix component assay, and gene expression determination. Toxicity was examined by prostaglandin E2 formation in joint fluid, and lymph node morphology combined with histologic screening of organs. RESULTS MACI-implanted defects had improved gross healing and composite histologic scores, as well as increases in chondrocyte predominance, toluidine blue-stained matrix, and collagen type-II content compared with scaffold-only implanted or empty defects. There was minimal evidence of reaction to the implant in the synovial membrane (minor perivascular cuffing), subchondral bone, or cartilage. There were no adverse clinical effects, signs of organ toxicity, or evidence of chondrocytes or collagen type-I/III membrane in draining lymph nodes. CONCLUSIONS The MACI implant appeared to improve cartilage healing in a critical-sized defect in the equine model compared with collagen matrix alone. CLINICAL RELEVANCE These results indicate that the MACI implant is quick to insert, provides chondrocyte security in the defect, and improves cartilage healing compared with ACI.
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Affiliation(s)
- Alan J Nixon
- Comparative Orthopaedics Laboratory, Department of Clinical Sciences (A.J.N., H.D.S., L.B., and M.S.S.), and Department of Biomedical Sciences, College of Veterinary Medicine (S.M.), Cornell University, Ithaca, New York
| | - Holly D Sparks
- Comparative Orthopaedics Laboratory, Department of Clinical Sciences (A.J.N., H.D.S., L.B., and M.S.S.), and Department of Biomedical Sciences, College of Veterinary Medicine (S.M.), Cornell University, Ithaca, New York
| | - Laila Begum
- Comparative Orthopaedics Laboratory, Department of Clinical Sciences (A.J.N., H.D.S., L.B., and M.S.S.), and Department of Biomedical Sciences, College of Veterinary Medicine (S.M.), Cornell University, Ithaca, New York
| | - Sean McDonough
- Comparative Orthopaedics Laboratory, Department of Clinical Sciences (A.J.N., H.D.S., L.B., and M.S.S.), and Department of Biomedical Sciences, College of Veterinary Medicine (S.M.), Cornell University, Ithaca, New York
| | - Michael S Scimeca
- Comparative Orthopaedics Laboratory, Department of Clinical Sciences (A.J.N., H.D.S., L.B., and M.S.S.), and Department of Biomedical Sciences, College of Veterinary Medicine (S.M.), Cornell University, Ithaca, New York
| | - Nance Moran
- Histogenics Corporation, Waltham, Massachusetts
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Begum L, Chow Y, Falola A, Meltzer M, Shah N. A measles outbreak in the London Borough of Hammersmith and Fulham, September–November 2016. Eur J Public Health 2017. [DOI: 10.1093/eurpub/ckx187.375] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- L Begum
- Public Health England, North West London, UK
| | - Y Chow
- Public Health England, North West London, UK
| | - A Falola
- Public Health England, North West London, UK
| | - M Meltzer
- Public Health England, North West London, UK
| | - N Shah
- Public Health England, North West London, UK
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Ortved KF, Begum L, Mohammed HO, Nixon AJ. Implantation of rAAV5-IGF-I transduced autologous chondrocytes improves cartilage repair in full-thickness defects in the equine model. Mol Ther 2014; 23:363-73. [PMID: 25311491 DOI: 10.1038/mt.2014.198] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 10/02/2014] [Indexed: 01/18/2023] Open
Abstract
Cartilage injury often precipitates osteoarthritis which has driven research to bolster repair in cartilage impact damage. Autologous chondrocytes transduced with rAAV5-IGF-I were evaluated in chondral defects in a well-established large animal model. Cartilage was harvested from the talus of 24 horses; chondrocytes were isolated and stored frozen. Twenty million cells were cultured and transduced with 10(5) AAV vg/cell prior to implantation. Chondrocytes from eight horses were transduced with rAAV5-IGF-I, chondrocytes from eight horses with rAAV5-GFP, and chondrocytes from eight horses were not transduced. A 15 mm full-thickness chondral defect was created arthroscopically in the lateral trochlear ridge of the femur in both femoropatellar joints. Treated defects were filled with naive or gene-enhanced chondrocytes, in fibrin vehicle. Control defects in the opposite limb received fibrin alone. rAAV5-IGF-I transduced chondrocytes resulted in significantly better healing at 8 week arthroscopy and 8 month necropsy examination when compared to controls. At 8 months, defects implanted with cells expressing IGF-I had better histological scores compared to control defects and defects repaired with naive chondrocytes. This included increased chondrocyte predominance and collagen type II, both features of hyaline-like repair tissue. The equine model closely approximates human cartilage healing, indicating AAV-mediated genetic modification of chondrocytes may be clinically beneficial to humans.
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Affiliation(s)
- Kyla F Ortved
- Comparative Orthopaedics Laboratory, Cornell University, Ithaca, New York, USA
| | - Laila Begum
- Comparative Orthopaedics Laboratory, Cornell University, Ithaca, New York, USA
| | - Hussni O Mohammed
- Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
| | - Alan J Nixon
- Comparative Orthopaedics Laboratory, Cornell University, Ithaca, New York, USA
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Nixon AJ, Begum L, Mohammed HO, Huibregtse B, O'Callaghan MM, Matthews GL. Autologous chondrocyte implantation drives early chondrogenesis and organized repair in extensive full- and partial-thickness cartilage defects in an equine model. J Orthop Res 2011; 29:1121-30. [PMID: 21319216 DOI: 10.1002/jor.21366] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Accepted: 12/27/2010] [Indexed: 02/04/2023]
Abstract
Autologous chondrocyte implantation (ACI) has been used clinically for over 15 years and yet definitive evidence of chondrocyte persistence and direct impact on cartilage repair in full-thickness lesions is scant and no data are available on ACI in partial-thickness defects in any animal model. This study assessed the effect of chondrocytes secured using periosteal overlay in partial- and full-thickness cartilage defects in the equine model. Paired cartilage defects 15 mm in diameter were made in the patellofemoral joint of 16 horse and repaired with ACI or periosteal flap alone. Response was assessed at 8 weeks by clinical, microradiographic, and histologic appearance, and by collagen type II immunohistochemistry, and proteoglycan and DNA quantification. ACI improved histologic scores in partial- and full-thickness cartilage defects, including defect filling, attachment to the underlying subchondral bone, and presence of residual chondrocyte accumulations. For partial-thickness defects chondrocyte predominance, collagen type II content, and toluidine stained matrix were enhanced, and attachment to the surrounding cartilage improved. DNA and PG content of grafted partial-thickness defects was improved by chondrocyte implantation. Periosteal patches alone did not induce cartilage repair. This study indicated implantation of chondrocytes to cartilage defects improved healing with a combination of persisting chondrocyte regions, enhanced collagen type II formation, and better overall cartilage healing scores. Use of ACI in the more challenging partial-thickness defects also improved histologic indices and biochemical content. The equine model of cartilage healing closely resembles cartilage repair in man, and results of this study confirm cell persistence and improved early cartilage healing events after ACI.
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Affiliation(s)
- Alan J Nixon
- Comparative Orthopaedics Laboratory, Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, USA.
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Yoshida G, Li MX, Horiuchi M, Nakagawa S, Sakata M, Kuchiiwa S, Kuchiiwa T, Jalil MA, Begum L, Lu YB, Iijima M, Hanada T, Nakazato M, Huang ZL, Eguchi N, Kobayashi K, Saheki T. Fasting-induced reduction in locomotor activity and reduced response of orexin neurons in carnitine-deficient mice. Neurosci Res 2006; 55:78-86. [PMID: 16540195 DOI: 10.1016/j.neures.2006.02.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2005] [Revised: 02/02/2006] [Accepted: 02/02/2006] [Indexed: 11/30/2022]
Abstract
We found reduced locomotor activity (LA) under fasting in systemic carnitine-deficient juvenile visceral steatosis (jvs(-/-)) mice. When food was withdrawn at 8:00 a.m. (lights-off at 7:00 p.m., 12h/cycle), the nocturnal LA of jvs(-/-) mice was much less than the control (jvs(+/+) and jvs(+/-)) mice. LA recovered under carnitine or sucrose administration, but not under medium-chain triglyceride. In addition, fasted jvs(-/-) mice, without any energy supply, were activated by modafinil, a stimulator of the dopamine pathway. These results suggest that the reduced LA is not adequately explained by energy deficit. As the fasted jvs(-/-) mice showed lower body core temperature (BT), we examined the central nervous system regulating LA and BT. We found lower percentage of c-Fos positive orexin neurons in the lateral hypothalamus and reduced orexin-A concentration in the cerebrospinal fluid of fasted jvs(-/-) mice. Sleep analysis revealed that fasted jvs(-/-) mice had disruption of prolonged wakefulness, with a higher frequency of brief episodes of non-REM sleep during the dark period than fasted jvs(+/+) mice. These results strongly suggest that the reduced LA in fasted jvs(-/-) mice is related to the inhibition of orexin neuronal activity.
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Affiliation(s)
- Goichiro Yoshida
- Department of Molecular Metabolism and Biochemical Genetics, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan
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15
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Jalil MA, Horiuchi M, Wakamatsu M, Li MX, Begum L, Suzuki K, Kobayashi K, Oka T, Saheki T. Attenuation of Cardiac Hypertrophy in Carnitine-Deficient Juvenile Visceral Steatosis (JVS) Mice Achieved by Lowering Dietary Lipid. ACTA ACUST UNITED AC 2006; 139:263-70. [PMID: 16452314 DOI: 10.1093/jb/mvj032] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
We examined the development of cardiac hypertrophy in juvenile visceral steatosis (JVS) mice, a model of systemic carnitine deficiency, by varying the amount of lipid in the diet. Cardiac hypertrophy was markedly attenuated by decreasing soy bean oil (SBO) from 5% (w/w) to 1%. Triglyceride contents of the ventricles of JVS mice fed 1% SBO were significantly lower than in JVS mice fed 5% SBO. The addition of medium-chain triglycerides metabolically utilized by JVS mice did not affect the development of cardiac hypertrophy. On the other hand, the mRNA levels of atrial natriuretic peptide and skeletal alpha-actin, which are related to cardiac hypertrophy, were also attenuated by decreasing lipid in the diet. Adenylate energy charge and creatine phosphate in the heart of JVS mice at the early stage of hypertrophy were not significantly different from control mice given the same laboratory chow (4.6% of lipid). Although urinary prostaglandin F(2alpha) levels were found to be increased in JVS mice at 15 days of age when they developed cardiac hypertrophy, administration of aspirin was not efficacious. We, therefore, propose that the proportion of lipid in the diet is important in the development of cardiac hypertrophy in carnitine-deficient JVS mice, and that this is not related to prostaglandin formation.
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Affiliation(s)
- Md Abdul Jalil
- Department of Molecular Metabolism and Biochemical Genetics and Laboratory for Neuroanatomy, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan
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16
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Takahashi H, Kagawa T, Kobayashi K, Hirabayashi H, Yui M, Begum L, Mine T, Takagi S, Saheki T, Shinohara Y. A case of adult-onset type II citrullinemia--deterioration of clinical course after infusion of hyperosmotic and high sugar solutions. Med Sci Monit 2006; 12:CS13-5. [PMID: 16449956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2005] [Accepted: 11/22/2005] [Indexed: 05/06/2023] Open
Abstract
BACKGROUND Adult-onset type II citrullinemia (CTLN2) is an autosomal recessive disorder caused by mutations of SLC25A13 gene encoding citrin and is characterized by recurrent encephalopathy with hyperammonemia. Factors affecting disease progression remain unknown. We report a case with CTLN2, whose clinical course was rapidly worsened by the administration of Glyceol, a hyperosmotic diuretic solution consisting of 10% glycerol and 5% fructose in saline. CASE REPORT A 34-year-old man was admitted in coma after repeated episodes of altered consciousness. His plasma ammonia level was markedly elevated without any evidence of liver diseases. Brain MRI revealed high signal intensities at the bilateral cingulate gyri and insular cortices, suggesting hepatic encephalopathy. We administered Glyceol. intravenously to alleviate brain edema, however, he developed intractable seizures along with steep increase in plasma ammonia levels (from 808 to 2210 microg/dL) and died. The diagnosis of CTLN2 was confirmed by elevations of plasma citrulline level (384.3 nmol/mL; normal 17-43 nmol/mL) and serum pancreatic secretory trypsin inhibitor (PSTI) (110 ng/mL; normal 4.6-12.2 ng/mL), decrease in hepatic argininosuccinate synthetase activity (5.5% of control), lack of hepatic citrin protein expression and mutations in SLC25A13 gene (compound heterozygote with S225X and Ex1-1G>A). CONCLUSIONS Physicians should take CTLN2 into consideration as a differential diagnosis in Asian patients with a history of repeated unconsciousness with hyperammonemia and use D-mannitol but not glycerol to treat brain edema in patients with CTLN2.
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Affiliation(s)
- Hirohide Takahashi
- Division of Neurology, Department of Internal Medicine, Tokai University School of Medicine, Isehara, Japan
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17
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Jalil MA, Begum L, Contreras L, Pardo B, Iijima M, Li MX, Ramos M, Marmol P, Horiuchi M, Shimotsu K, Nakagawa S, Okubo A, Sameshima M, Isashiki Y, Del Arco A, Kobayashi K, Satrústegui J, Saheki T. Reduced N-Acetylaspartate Levels in Mice Lacking Aralar, a Brain- and Muscle-type Mitochondrial Aspartate-glutamate Carrier. J Biol Chem 2005; 280:31333-9. [PMID: 15987682 DOI: 10.1074/jbc.m505286200] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Aralar is a mitochondrial calcium-regulated aspartate-glutamate carrier mainly distributed in brain and skeletal muscle, involved in the transport of aspartate from mitochondria to cytosol, and in the transfer of cytosolic reducing equivalents into mitochondria as a member of the malate-aspartate NADH shuttle. In the present study, we describe the characteristics of aralar-deficient (Aralar-/-) mice, generated by a gene-trap method, showing no aralar mRNA and protein, and no detectable malate-aspartate shuttle activity in skeletal muscle and brain mitochondria. Aralar-/- mice were growth-retarded, exhibited generalized tremoring, and had pronounced motor coordination defects along with an impaired myelination in the central nervous system. Analysis of lipid components showed a marked decrease in the myelin lipid galactosyl cerebroside. The content of the myelin lipid precursor, N-acetylaspartate, and that of aspartate are drastically decreased in the brain of Aralar-/- mice. The defect in N-acetylaspartate production was also observed in cell extracts from primary neuronal cultures derived from Aralar-/- mouse embryos. These results show that aralar plays an important role in myelin formation by providing aspartate for the synthesis of N-acetylaspartate in neuronal cells.
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Affiliation(s)
- Md Abdul Jalil
- Department of Molecular Metabolism and Biochemical Genetics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima 890-8544, Japan
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18
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Saheki T, Kobayashi K, Iijima M, Horiuchi M, Begum L, Jalil MA, Li MX, Lu YB, Ushikai M, Tabata A, Moriyama M, Hsiao KJ, Yang Y. Adult-onset type II citrullinemia and idiopathic neonatal hepatitis caused by citrin deficiency: involvement of the aspartate glutamate carrier for urea synthesis and maintenance of the urea cycle. Mol Genet Metab 2004; 81 Suppl 1:S20-6. [PMID: 15050970 DOI: 10.1016/j.ymgme.2004.01.006] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2003] [Revised: 10/04/2003] [Accepted: 10/21/2003] [Indexed: 10/26/2022]
Abstract
Citrin is a mitochondrial aspartate glutamate carrier primarily expressed in the liver, heart, and kidney. We found that adult-onset type II citrullinemia is caused by mutations in the SLC25A13 gene that encodes for citrin. In this report, we describe the frequency of SLC25A13 mutations, the roles of citrin as a member of the urea cycle and as a member of the malate-aspartate shuttle, the relationship between its functions and symptoms of citrin deficiency, and therapeutic issues.
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Affiliation(s)
- Takeyori Saheki
- Department of Molecular Metabolism and Biochemical Genetics, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
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19
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Sinasac DS, Moriyama M, Jalil MA, Begum L, Li MX, Iijima M, Horiuchi M, Robinson BH, Kobayashi K, Saheki T, Tsui LC. Slc25a13-knockout mice harbor metabolic deficits but fail to display hallmarks of adult-onset type II citrullinemia. Mol Cell Biol 2004; 24:527-36. [PMID: 14701727 PMCID: PMC343808 DOI: 10.1128/mcb.24.2.527-536.2004] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Adult-onset type II citrullinemia (CTLN2) is an autosomal recessive disease caused by mutations in SLC25A13, the gene encoding the mitochondrial aspartate/glutamate carrier citrin. The absence of citrin leads to a liver-specific, quantitative decrease of argininosuccinate synthetase (ASS), causing hyperammonemia and citrullinemia. To investigate the physiological role of citrin and the development of CTLN2, an Slc25a13-knockout (also known as Ctrn-deficient) mouse model was created. The resulting Ctrn-/- mice were devoid of Slc25a13 mRNA and citrin protein. Liver mitochondrial assays revealed markedly decreased activities in aspartate transport and the malate-aspartate shuttle. Liver perfusion also demonstrated deficits in ureogenesis from ammonia, gluconeogenesis from lactate, and an increase in the lactate-to-pyruvate ratio within hepatocytes. Surprisingly, Ctrn-/- mice up to 1 year of age failed to show CTLN2-like symptoms due to normal hepatic ASS activity. Serological measures of glucose, amino acid, and ammonia metabolism also showed no significant alterations. Nitrogen-loading treatments produced only minor changes in the hepatic ammonia and amino acid levels. These results suggest that citrin deficiency alone may not be sufficient to produce a CTLN2-like phenotype in mice. These observations are compatible, however, with the variable age of onset, incomplete penetrance, and strong ethnic bias seen in CTLN2 where additional environmental and/or genetic triggers are now suspected.
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Affiliation(s)
- David S Sinasac
- Genetics & Genomic Biology, The Hospital for Sick Children, Toronto, Ontario, Canada M5G 1X8
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20
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Sabin KM, Rahman M, Hawkes S, Ahsan K, Begum L, Black RE, Baqui AH. Sexually transmitted infections prevalence rates in slum communities of Dhaka, Bangladesh. Int J STD AIDS 2003; 14:614-21. [PMID: 14511498 DOI: 10.1258/095646203322301077] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The study objective was to estimate the prevalence of selected sexually transmitted infections (STIs) and associated factors among Dhaka slum dwellers. Blood and urine specimens were collected from 1534 men and women. Participants in this cross-sectional study responded to a questionnaire, providing socioeconomic data, symptomatology and treatment-seeking behaviour. Specimens were tested for syphilis, hepatitis B (HBsAg), Neisseria gonorrhoeae, Chlamydia trachomatis, and HIV. Serologic evidence of syphilis infection was found in 6.0% of respondents, HBsAg in 3.8%. Prevalence rates of gonorrhoea and chlamydia were 1.7% and <1%, respectively. No HIV infections were found. Men were more than twice as likely as women to be infected with syphilis or HBsAg carriers. Behaviours facilitating STI transmission were common among men. Syphilis infection is prevalent enough to warrant the initiation of screening programmes in this population. The prevalence rate of hepatitis B carriage suggests that this population would benefit from universal vaccination against hepatitis B.
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Affiliation(s)
- K M Sabin
- International Centre for Diarrhoeal Disease Research, Bangladesh.
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21
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Gao HZ, Kobayashi K, Tabata A, Tsuge H, Iijima M, Yasuda T, Kalkanoglu HS, Dursun A, Tokatli A, Coskun T, Trefz FK, Skladal D, Mandel H, Seidel J, Kodama S, Shirane S, Ichida T, Makino S, Yoshino M, Kang JH, Mizuguchi M, Barshop BA, Fuchinoue S, Seneca S, Zeesman S, Knerr I, Rodés M, Wasant P, Yoshida I, De Meirleir L, Abdul Jalil M, Begum L, Horiuchi M, Katunuma N, Nakagawa S, Saheki T. Identification of 16 novel mutations in the argininosuccinate synthetase gene and genotype-phenotype correlation in 38 classical citrullinemia patients. Hum Mutat 2003; 22:24-34. [PMID: 12815590 DOI: 10.1002/humu.10230] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Classical citrullinemia (CTLN1), a rare autosomal recessive disorder, is caused by mutations of the argininosuccinate synthetase (ASS) gene, localized on chromosome 9q34.1. ASS functions as a rate-limiting enzyme in the urea cycle. Previously, we identified 32 mutations in the ASS gene of CTLN1 patients mainly in Japan and the United States, and to date 34 different mutations have been described in 50 families worldwide. In the present study, we report ASS mutations detected in 35 additional CTLN1 families from 11 countries. By analyzing the entire coding sequence and the intron-exon boundaries of the ASS gene using RT-PCR and/or genomic DNA-PCR, we have identified 16 novel mutations (two different 1-bp deletions, a 67-bp insertion, and 13 missense) and have detected 12 known mutations. Altogether, 50 different mutations (seven deletion, three splice site, one duplication, two nonsense, and 37 missense) in 85 CTLN1 families were identified. On the basis of primary sequence comparisons with the crystal structure of E. coli ASS protein, it may be concluded that any of the 37 missense mutations found at 30 different positions led to structural and functional impairments of the human ASS protein. It has been found that three mutations are particularly frequent: IVS6-2A>G in 23 families (Japan: 20 and Korea: three), G390R in 18 families (Turkey: six, U.S.: five, Spain: three, Israel: one, Austria: one, Canada: one, and Bolivia: one), and R304W in 10 families (Japan: nine and Turkey: one). Most mutations of the ASS gene are "private" and are distributed throughout the gene, except for exons 5 and 12-14. It seems that the clinical course of the patients with truncated mutations or the G390R mutation is early-onset/severe. The phenotype of the patients with certain missense mutations (G362V or W179R) is more late-onset/mild. Eight patients with R86H, A118T, R265H, or K310R mutations were adult/late-onset and four of them showed severe symptoms during pregnancy or postpartum. However, it is still difficult to prove the genotype-phenotype correlation, because many patients were compound heterozygotes (with two different mutations), lived in different environments at the time of diagnosis, and/or had several treatment regimes or various knowledge of the disease.
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Affiliation(s)
- Hong-Zhi Gao
- Department of Biochemistry, Faculty of Medicine, Kagoshima University, Kagoshima, Japan
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22
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Saheki T, Kobayashi K, Iijima M, Nishi I, Yasuda T, Yamaguchi N, Gao HZ, Jalil MA, Begum L, Li MX. Pathogenesis and pathophysiology of citrin (a mitochondrial aspartate glutamate carrier) deficiency. Metab Brain Dis 2002; 17:335-46. [PMID: 12602510 DOI: 10.1023/a:1021961919148] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Adult-onset type II citrullinemia (CTLN2), characterized by a liver-specific deficiency of urea cycle enzyme, argininosuccinate synthetase, is caused by mutations in SLC25A13 that encodes a calcium binding mitochondrial solute carrier protein, citrin. Citrin deficiency causes not only CTLN2 but also neonatal intrahepatic cholestasis caused by citrin deficiency at neonatal period. Moreover citrin and its isoform aralar were found to be aspartate glutamate carrier. From the viewpoint of the metabolic functions of citrin as aspartate glutamate carrier in urea synthesis and NADH shuttle, symptoms of CTLN2 and neonatal intrahepatic cholestasis caused by citrin deficiency are analyzed.
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Affiliation(s)
- Takeyori Saheki
- Department of Biochemistry, Faculty of Medicine, Kagoshima University, Kagoshima, Japan.
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23
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Fukumaru S, Horiuchi M, Kobayashi K, Jalil MA, Iijima M, Masuda M, Begum L, Higashi M, Wakana S, Kanzaki T, Saheki T. Novel mRNA molecules are induced in hypertrophied ventricles of carnitine-deficient mice and belong to a family of up-regulated gene in cells overexpressing c-erbB-2. Biochim Biophys Acta 2002; 1577:437-44. [PMID: 12359334 DOI: 10.1016/s0167-4781(02)00447-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To clarify the pathogenesis of cardiac hypertrophy in carnitine-deficient juvenile visceral steatosis (JVS) mice, we performed differential mRNA display analysis with the ventricles of control and JVS mice. We found a novel up-regulated gene, designated as carnitine deficiency-associated gene expressed in ventricle (CDV)-3. Northern blot analysis with a cDNA probe derived from the novel gene revealed two substantial mRNA species of prominent 4.1- and faint 3.5-kb in examined tissues of control and JVS mice. In spite of their widely expressed features, up-regulation of the gene was found predominantly in the ventricles and slightly in the auricles and skeletal muscles of JVS mice. The up-regulation of CDV-3 gene in the ventricles of JVS mice was significantly relieved by carnitine administration within 6 h. The entire cDNA nucleotide sequences showed that two kinds of cDNA, long and short versions (CDV-3A and -3B), corresponding to the detected mRNAs, are different in a 711 base fragment. Analysis of genomic DNA revealed that the two mRNAs were derived from a single CDV-3 gene with five exons by alternative splicing. The deduced amino acid sequences indicated that the isoforms consist of 236 and 281 residues, differing at regions near the carboxy-terminus but sharing 231 residues of the amino-terminal regions. A BLAST search revealed that they show a high similarity to a human predicted nuclear protein (H41), which has been reported to be up-regulated in breast cancer cells overexpressing cellular-erythroblastosis B-2 (c-erbB-2, a kind of tyrosine kinase).We report the identification and characterization of novel transcripts that may be involved in the development of cardiac hypertrophy caused by carnitine deficiency.
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Affiliation(s)
- Seita Fukumaru
- Department of Biochemistry, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, Japan
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24
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Begum L, Jalil MA, Kobayashi K, Iijima M, Li MX, Yasuda T, Horiuchi M, del Arco A, Satrústegui J, Saheki T. Expression of three mitochondrial solute carriers, citrin, aralar1 and ornithine transporter, in relation to urea cycle in mice. Biochim Biophys Acta 2002; 1574:283-92. [PMID: 11997094 DOI: 10.1016/s0167-4781(01)00376-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The present report describes the expression profiles of different tissues and developmental changes of mouse aspartate/glutamate carrier (AGC) genes, Slc25a13 and Slc25a12, and an ornithine transporter gene, Ornt1, in relation to urea cycle enzyme genes, carbamoylphosphate synthetase I (CPS) and argininosuccinate synthetase (ASS). Slc25a13 encodes citrin, recently found to be deficient in adult-onset type II citrullinemia and to function as AGC together with its isoform and product of Slc25a12, aralar1. Citrin was broadly distributed, but mainly in the liver, kidney and heart. Aralar1 was expressed in diaphragm, skeletal muscle, heart, brain and kidney, but not in the liver. These distribution profiles are different from the restricted of Ornt1, ASS and CPS. Citrin, ASS, CPS and Ornt1 showed similar patterns of developmental changes in the liver and small intestine, where they play a role in urea and arginine synthesis. Dietary, hormonal and physical manipulations caused varied changes of CPS, ASS and Ornt1 in the liver, but the change of citrin was not so marked as that of the others. Analysis using RT-PCR and restriction enzyme digestion revealed that the ornithine transporter most expressed is Ornt1, although Ornt2 is detectable at a minute level. All these results suggest that citrin as AGC plays a role in urea synthesis as well as many fundamental metabolic pathways in the liver, and shares metabolic functions with aralar1 in other tissues, and that Ornt1 is an important component in urea synthesis in the liver and in arginine synthesis in the small intestine during the neonatal period.
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Affiliation(s)
- Laila Begum
- Department of Biochemistry, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, 890-8520, Kagoshima, Japan
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25
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Iijima M, Jalil A, Begum L, Yasuda T, Yamaguchi N, Xian Li M, Kawada N, Endou H, Kobayashi K, Saheki T. Pathogenesis of adult-onset type II citrullinemia caused by deficiency of citrin, a mitochondrial solute carrier protein: tissue and subcellular localization of citrin. Adv Enzyme Regul 2001; 41:325-42. [PMID: 11384753 DOI: 10.1016/s0065-2571(00)00022-4] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- M Iijima
- Department of Biochemistry, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, 890-8520, Kagoshima, Japan
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26
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Abstract
This paper explores the perceived causes of infertility, treatment-seeking for infertility and the consequences of childlessness, particularly for women, among a predominantly Muslim population in urban slums of Dhaka in Bangladesh. In-depth interviews were conducted with 60 women and 60 men randomly selected from Urban Surveillance System clusters of the International Centre for Diarrhoeal Disease Research, Bangladesh. Case studies of 20 self-perceived infertile women who had previously participated in a study on the prevalence of sexually transmitted diseases and other reproductive tract infections were taken, and three traditional healers were interviewed as key informants. In both groups of respondents, the leading causes of infertility were perceived to be evil spirits and physiological defects in women and psychosexual problems and physiological defects in men. Herbalists and traditional healers were considered the leading treatment option for women, while for men it was remarriage, followed by herbalists and traditional healers. Childlessness was found to result in perceived role failure, with social and emotional consequences for both men and women, and often resulted in social stigmatisation of the couple, particularly of the woman. Infertility places women at risk of social and familial displacement, and women clearly bear the greatest burden of infertility. Successful programmes for dealing with infertility in Bangladesh need to include both appropriate and effective sources of treatment at community level and community-based interventions to demystify the causes of infertility, so that people know why infertility occurs in both men and women and and where best to seek care.
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Affiliation(s)
- N Papreen
- ICDDR,B Centre for Health and Population Research, Public Health Sciences Division, Social and Behavioural Sciences Programme, GPO Box 128, Mohakhali 1212, Dhaka 1000, Bangladesh.
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27
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Kobayashi K, Sinasac DS, Iijima M, Boright AP, Begum L, Lee JR, Yasuda T, Ikeda S, Hirano R, Terazono H, Crackower MA, Kondo I, Tsui LC, Scherer SW, Saheki T. The gene mutated in adult-onset type II citrullinaemia encodes a putative mitochondrial carrier protein. Nat Genet 1999; 22:159-63. [PMID: 10369257 DOI: 10.1038/9667] [Citation(s) in RCA: 310] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Citrullinaemia (CTLN) is an autosomal recessive disease caused by deficiency of argininosuccinate synthetase (ASS). Adult-onset type II citrullinaemia (CTLN2) is characterized by a liver-specific ASS deficiency with no abnormalities in hepatic ASS mRNA or the gene ASS (refs 1-17). CTLN2 patients (1/100,000 in Japan) suffer from a disturbance of consciousness and coma, and most die with cerebral edema within a few years of onset. CTLN2 differs from classical citrullinaemia (CTLN1, OMIM 215700) in that CTLN1 is neonatal or infantile in onset, with ASS enzyme defects (in all tissues) arising due to mutations in ASS on chromosome 9q34 (refs 18-21). We collected 118 CTLN2 families, and localized the CTLN2 locus to chromosome 7q21.3 by homozygosity mapping analysis of individuals from 18 consanguineous unions. Using positional cloning we identified a novel gene, SLC25A13, and found five different DNA sequence alterations that account for mutations in all consanguineous patients examined. SLC25A13 encodes a 3.4-kb transcript expressed most abundantly in liver. The protein encoded by SLC25A13, named citrin, is bipartite in structure, containing a mitochondrial carrier motif and four EF-hand domains, suggesting it is a calcium-dependent mitochondrial solute transporter with a role in urea cycle function.
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MESH Headings
- Adult
- Age of Onset
- Amino Acid Metabolism, Inborn Errors/genetics
- Amino Acid Metabolism, Inborn Errors/metabolism
- Amino Acid Sequence
- Animals
- Argininosuccinate Synthase/deficiency
- Argininosuccinate Synthase/genetics
- Brain Edema/genetics
- Caenorhabditis elegans/genetics
- Calcium-Binding Proteins/biosynthesis
- Calcium-Binding Proteins/chemistry
- Calcium-Binding Proteins/genetics
- Chromosome Mapping
- Chromosomes, Human, Pair 9
- Citrulline/blood
- Consanguinity
- Conserved Sequence
- Female
- Genes, Recessive
- Genetic Markers
- Humans
- Infant
- Infant, Newborn
- Male
- Membrane Transport Proteins
- Mitochondria, Liver/metabolism
- Mitochondrial Membrane Transport Proteins
- Mitochondrial Proteins
- Models, Molecular
- Molecular Sequence Data
- Mutation
- Protein Structure, Secondary
- Sequence Alignment
- Sequence Homology, Amino Acid
- Syndrome
- Transcription, Genetic
- Urea/metabolism
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Affiliation(s)
- K Kobayashi
- Department of Biochemistry, Faculty of Medicine, Kagoshima University, Japan.
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