1
|
Liu Y, Chu W, Ma H, Peng W, Li Q, Han L, Wang H, Wang L, Zhang B, Yang J, Lu X. Fisetin orchestrates neuroinflammation resolution and facilitates spinal cord injury recovery through enhanced autophagy in pro-inflammatory glial cells. Int Immunopharmacol 2024; 130:111738. [PMID: 38428149 DOI: 10.1016/j.intimp.2024.111738] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 02/11/2024] [Accepted: 02/19/2024] [Indexed: 03/03/2024]
Abstract
BACKGROUND Neuroinflammation, a critical component of the secondary injury cascade post-spinal cord injury, involves the activation of pro-inflammatory cells and release of inflammatory mediators. Resolution of neuroinflammation is closely linked to cellular autophagy. This study investigates the potential of Fisetin, a natural anti-inflammatory compound, to ameliorate neuroinflammation and confer spinal cord injury protection through the regulation of autophagy in pro-inflammatory cells. METHODS Utilizing a rat T10 spinal cord injury model with distinct treatment groups (Sham, Fisetin-treated, and Fisetin combined with autophagy inhibitor), alongside in vitro models involving lipopolysaccharide (LPS)-stimulated microglial cell activation and co-culture with neurons, we employed techniques such as transcriptomic sequencing, histological assessments (immunofluorescence staining, etc.), molecular analyses (PCR, WB, ELISA, etc.), and behavioral evaluations to discern differences in neuroinflammation, autophagy, neuronal apoptosis, and neurological function recovery. RESULTS Fisetin significantly augmented autophagic activity in injured spinal cord tissue, crucially contributing to neurological function recovery in spinal cord-injured rats. Fisetin's autophagy-dependent effects were associated with a reduction in neuronal apoptosis at the injury site. The treatment reduced the population of CD68+ and iNOS+ cells, coupled with decreased pro-inflammatory cytokines IL-6 and TNF-α levels, through autophagy-dependent pathways. Fisetin pre-treatment attenuated LPS-induced pro-inflammatory polarization of microglial cells, with this protective effect partially blocked by autophagy inhibition. Fisetin-induced autophagy in the injured spinal cord and pro-inflammatory microglial cells was associated with significant activation of AMPK and inhibition of mTOR. CONCLUSION Fisetin orchestrates enhanced autophagy in pro-inflammatory microglial cells through the AMPK-mTOR signaling pathway, thereby mitigating neuroinflammation and reducing the apoptotic effects of neuroinflammation on neurons. This mechanistic insight significantly contributes to the protection and recovery of neurological function following spinal cord injury, underscoring the vital nature of Fisetin as a potential therapeutic agent.
Collapse
Affiliation(s)
- Yishan Liu
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu, People's Republic of China; Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China; Department of Spinal Surgery, Subei People's Hospital, Clinical Medical School, Yangzhou University Affiliated Hospital, Yangzhou, China
| | - Wenxiang Chu
- Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Hongdao Ma
- Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Weilin Peng
- Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Qisheng Li
- Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Lin Han
- Department of Orthopaedics, Third Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Haibin Wang
- Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Liang Wang
- Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Bangke Zhang
- Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China
| | - Jiandong Yang
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, Jiangsu, People's Republic of China; Department of Spinal Surgery, Subei People's Hospital, Clinical Medical School, Yangzhou University Affiliated Hospital, Yangzhou, China.
| | - Xuhua Lu
- Department of Orthopaedic Surgery, Changzheng Hospital, Naval Medical University, Shanghai, China.
| |
Collapse
|
2
|
Li J, Cao Y, Li LN, Chu X, Wang YS, Cai JJ, Zhao J, Ma S, Li G, Fan ZK. Neuroprotective Effects of Oxymatrine via Triggering Autophagy and Inhibiting Apoptosis Following Spinal Cord Injury in Rats. Mol Neurobiol 2023; 60:4450-4471. [PMID: 37115405 DOI: 10.1007/s12035-023-03364-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 04/20/2023] [Indexed: 04/29/2023]
Abstract
Spinal cord injury (SCI) is a devastating neurological disorder characterized by high morbidity and disability. However, there is still a lack of effective treatments for it. The identification of drugs that promote autophagy and inhibit apoptosis in neurons is critical for improving patient outcomes following SCI. Previous studies have shown that increasing the activity of silent information regulator 1 (SIRT1) and downstream protein AMP-activated protein kinase (AMPK) in rat models of SCI is highly neuroprotective. Oxymatrine (OMT), a quinolizidine alkaloid, has exhibited neuroprotective effects in various central nervous system (CNS) diseases. However, its explicit effect and molecular mechanism in SCI are still unclear. Herein, we aimed to investigate the therapeutic effects of OMT and explore the potential role of autophagy regulation following SCI in rats. A modified compressive device (weight 35 g, time 5 min) was applied to induce moderate SCI in all groups except the sham group. After treatment with drugs or vehicle (saline), our results indicated that OMT treatment significantly reduced the lesion size, promoted survival of motor neurons, and subsequently attenuated motor dysfunction following SCI in rats. OMT significantly enhanced autophagy activity, inhibited apoptosis in neurons, and increased SIRT1 and p-AMPK expression levels. Interestingly, these effects of OMT on SCI were partially prevented by co-treatment with SIRT1 inhibitor EX527. Furthermore, combining OMT with the potent autophagy inhibitor chloroquine (CQ) could effectively abolish its promotion of autophagic flux. Taken together, these data revealed that OMT exerts a neuroprotective role in functional recovery against SCI in rats, and these effects are potentially associated with OMT-induced activation of autophagy via the SIRT1/AMPK signaling pathway.
Collapse
Affiliation(s)
- Jian Li
- Department of Orthopedics, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China
| | - Yang Cao
- Department of Orthopedics, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China
| | - Lin-Na Li
- Departments of Endocrinology, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China
| | - Xin Chu
- Department of Orthopedics, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China
| | - Yan-Song Wang
- Department of Orthopedics, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China
| | - Jia-Jun Cai
- Department of Orthopedics, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China
| | - Jin Zhao
- Department of Orthopedics, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China
| | - Song Ma
- Department of Orthopedics, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China
| | - Gang Li
- Department of Orthopedics, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Qingdao, 266035, China.
| | - Zhong-Kai Fan
- Department of Orthopedics, First Affiliated Hospital, Jinzhou Medical University, Jinzhou, 121000, China.
| |
Collapse
|
3
|
Haggerty AE, Maldonado-Lasunción I, Nitobe Y, Yamane K, Marlow MM, You H, Zhang C, Cho B, Li X, Reddy S, Mao HQ, Oudega M. The Effects of the Combination of Mesenchymal Stromal Cells and Nanofiber-Hydrogel Composite on Repair of the Contused Spinal Cord. Cells 2022; 11:cells11071137. [PMID: 35406701 PMCID: PMC8997442 DOI: 10.3390/cells11071137] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/17/2022] [Accepted: 03/23/2022] [Indexed: 02/01/2023] Open
Abstract
A bone marrow-derived mesenchymal stromal cell (MSC) transplant and a bioengineered nanofiber-hydrogel composite (NHC) have been shown to stimulate nervous tissue repair in the contused spinal cord in rodent models. Here, these two modalities were combined to assess their repair effects in the contused spinal cord in adult rats. Cohorts of contused rats were treated with MSC in NHC (MSC-NHC), MSC in phosphate-buffered saline (MSC-PBS), NHC, or PBS injected into the contusion site at 3 days post-injury. One week after injury, there were significantly fewer CD68+ cells in the contusion with MSC-NHC and NHC, but not MSC-PBS. The reduction in CD86+ cells in the injury site with MSC-NHC was mainly attributed to NHC. One and eight weeks after injury, we found a greater CD206+/CD86+ cell ratio with MSC-NHC or NHC, but not MSC-PBS, indicating a shift from a pro-inflammatory towards an anti-inflammatory milieu in the injury site. Eight weeks after injury, the injury size was significantly reduced with MSC-NHC, NHC, and MSC-PBS. At this time, astrocyte, and axon presence in the injury site was greater with MSC-NHC compared with MSC-PBS. We did not find a significant effect of NHC on MSC transplant survival, and hind limb function was similar across all groups. However, we did find fewer macrophages at 1 week post-injury, more macrophages polarized towards a pro-regenerative phenotype at 1 and 8 weeks after injury, and reduced injury volume, more astrocytes, and more axons at 8 weeks after injury in rats with MSC-NHC and NHC alone compared with MSC-PBS; these findings were especially significant between rats with MSC-NHC and MSC-PBS. The data support further study in the use of an NHC-MSC combination transplant in the contused spinal cord.
Collapse
Affiliation(s)
- Agnes E. Haggerty
- The Miami Project to Cure Paralysis, University of Miami, Miami, FL 33136, USA; (A.E.H.); (I.M.-L.); (Y.N.); (K.Y.); (M.M.M.)
| | - Ines Maldonado-Lasunción
- The Miami Project to Cure Paralysis, University of Miami, Miami, FL 33136, USA; (A.E.H.); (I.M.-L.); (Y.N.); (K.Y.); (M.M.M.)
- Department of Regeneration of Sensorimotor Systems, Netherlands Institute for Neuroscience, Institute of the Royal Netherlands Academy of Arts and Sciences, 1105 BA Amsterdam, The Netherlands
- Shirley Ryan AbilityLab, Chicago, IL 60611, USA
- Department of Physical Therapy and Human Movements Sciences, Northwestern University, Chicago, IL 60611, USA
| | - Yohshiro Nitobe
- The Miami Project to Cure Paralysis, University of Miami, Miami, FL 33136, USA; (A.E.H.); (I.M.-L.); (Y.N.); (K.Y.); (M.M.M.)
- Department of Orthopedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki 036-8562, Japan
| | - Kentaro Yamane
- The Miami Project to Cure Paralysis, University of Miami, Miami, FL 33136, USA; (A.E.H.); (I.M.-L.); (Y.N.); (K.Y.); (M.M.M.)
- Department of Orthopedic Surgery, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Science, Kitaku, Okayama 700-8558, Japan
| | - Megan M. Marlow
- The Miami Project to Cure Paralysis, University of Miami, Miami, FL 33136, USA; (A.E.H.); (I.M.-L.); (Y.N.); (K.Y.); (M.M.M.)
| | - Hua You
- Department of Oncology and Hematology, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou 510095, China;
| | - Chi Zhang
- Translational Tissue Engineering Center, Johns Hopkins School of Medicine, Baltimore, MD 21231, USA; (C.Z.); (B.C.); (X.L.)
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA;
| | - Brian Cho
- Translational Tissue Engineering Center, Johns Hopkins School of Medicine, Baltimore, MD 21231, USA; (C.Z.); (B.C.); (X.L.)
- Department of Plastic and Reconstructive Surgery, Johns Hopkins School of Medicine, Baltimore, MD 21287, USA
| | - Xiaowei Li
- Translational Tissue Engineering Center, Johns Hopkins School of Medicine, Baltimore, MD 21231, USA; (C.Z.); (B.C.); (X.L.)
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA;
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Sashank Reddy
- Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA;
- Department of Plastic and Reconstructive Surgery, Johns Hopkins School of Medicine, Baltimore, MD 21287, USA
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Hai-Quan Mao
- Translational Tissue Engineering Center, Johns Hopkins School of Medicine, Baltimore, MD 21231, USA; (C.Z.); (B.C.); (X.L.)
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA;
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
- Correspondence: (H.-Q.M.); (M.O.)
| | - Martin Oudega
- Shirley Ryan AbilityLab, Chicago, IL 60611, USA
- Department of Physical Therapy and Human Movements Sciences, Northwestern University, Chicago, IL 60611, USA
- Department of Neuroscience, Northwestern University, Chicago, IL 60611, USA
- Edward Hines Jr. VA Hospital, Hines, IL 60141, USA
- Correspondence: (H.-Q.M.); (M.O.)
| |
Collapse
|
4
|
Zhu Y, Uezono N, Yasui T, Nakajo M, Nagai T, Wang D, Nishibori M, Nakashima K. Combinatrial treatment of anti-High Mobility Group Box-1 monoclonal antibody and epothilone B improves functional recovery after spinal cord contusion injury. Neurosci Res 2021:S0168-0102(21)00076-6. [PMID: 33864880 DOI: 10.1016/j.neures.2021.04.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 04/08/2021] [Accepted: 04/12/2021] [Indexed: 11/23/2022]
Abstract
Spinal cord injury (SCI) causes motor and sensory deficits and is currently considered an incurable disease. We have previously reported that administration of anti-High Mobility Group Box-1 monoclonal antibody (anti-HMGB1 mAb) preserved lesion area and improved locomotion recovery in mouse model of SCI. In order to further enhance the recovery, we here examined combinatorial treatment of anti-HMGB1 mAb and epothilone B (Epo B), which has been reported to promote axon regeneration. This combinatorial treatment significantly increased hindlimb movement compared with anti-HMGB1 mAb alone, although Epo B alone failed to increase functional recovery. These results are in agreement with that anti-HMGB1 mAb alone was able to decrease the lesion area spreading and increase the surviving neuron numbers around the lesion, whereas Epo B facilitated axon outgrowth only in combination with anti-HMGB1 mAb, suggesting that anti-HMGB1 mAb-dependent tissue preservation is necessary for Epo B to exhibit its therapeutic effect. Taken together, the combinatorial treatment can be considered as a novel and clinically applicable strategy for SCI.
Collapse
|
5
|
Karahan G, Kaya H, Eyceyurt RS, Erdogan MA, Yigitturk G, Erbas O. Dexpanthenol reduces fibrosis and aids repair following nerve laceration and neurorrhaphy. Exp Ther Med 2021; 21:207. [PMID: 33574908 PMCID: PMC7818528 DOI: 10.3892/etm.2021.9639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 12/01/2020] [Indexed: 11/17/2022] Open
Abstract
The aim of the present study was to investigate the effect of dexpanthenol on nerve healing following neurorrhaphy in lacerated peripheral nerves. A total of 30 mature Sprague Dawley rats were used. Surgical sciatic nerve dissection and repair was performed on an experimental group of 20 rats. The remaining 10 rats were designated as the control group. The experimental group was divided into 2 subgroups. The surgery + saline group (SSLE; n=10) was given 1 ml/kg 0.9% sodium chloride saline intraperitoneally. The surgery + dexpanthenol group (SDPL; n=10) rats were given 500 mg/kg/day dexpanthenol intraperitoneally. Histological evaluation of the sciatic nerve tissue revealed that the fibrosis score was significantly lower in the SDPL group than in the SSLE group (P<0.001). Electrophysiological evaluation of compound muscle action potential (CMAP) indicated that the CMAP level in the SDPL group was significantly higher than that of the SSLE group (P<0.001), and the CMAP latency period was lower in the SDPL group compared with the SSLE group (P<0.001). In addition, the SDPL group malondialdehyde level was significantly lower than that of the SSLE group (P<0.001). Functional evaluation with an inclined plane test revealed a significant difference between the SSLE (39.6±5.5˚) and SDPL (79.1±6.93˚) groups (P<0.001). Dexpanthenol was observed to have a positive effect on nerve tissue repaired with neurorrhaphy in a rat sciatic model of laceration-type injuries similar to those frequently encountered in the clinic.
Collapse
Affiliation(s)
- Gokhan Karahan
- Orthopedics and Traumatology Department, Bozyaka Training and Research Hospital, Izmir 35110, Turkey
| | - Huseyin Kaya
- Orthopedics and Traumatology Department, Faculty of Medicine, Ege University, Izmir 35040, Turkey
| | - Recep Selçuk Eyceyurt
- Orthopedics and Traumatology Department, Bozyaka Training and Research Hospital, Izmir 35110, Turkey
| | - Mumin Alper Erdogan
- Faculty of Medicine, Department of Physiology, Izmir Katip Celebi University, Karabaglar, Izmir 35000, Turkey
| | - Gurkan Yigitturk
- Department of Histology and Embryology, Faculty of Medicine, Muğla University, Menteşe, Muğla 48000, Turkey
| | - Oytun Erbas
- Department of Physiology, Faculty of Medicine, Istanbul Bilim University, Şişli, Istanbul 34000, Turkey
| |
Collapse
|
6
|
Lezcano LB, Alberti Amador E, González Fraguela ME, Zaldívar Lelo de Larrea G, Serrano RMP, Jiménez Luna NA, Camejo Rodríguez D, Serrano Sánchez T, Francis Turner L, Estupiñán Díaz B, Vega Hurtado Y, Fernández Jiménez I. Motor Coordination Disorders Evaluated through the Grid Test and Changes in the Nigral Nrf2 mRNA Expression in Rats with Pedunculopontine Lesion. Behav Sci (Basel) 2020; 10:E156. [PMID: 33066049 DOI: 10.3390/bs10100156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 09/22/2020] [Accepted: 09/30/2020] [Indexed: 11/16/2022] Open
Abstract
Neurotoxic lesion of the pedunculopontine nucleus (PPN) is known to cause subtle motor dysfunctions. However, motor coordination during advance on a discontinuous and elevated surface has not been studied. It is also not known whether there are changes in the mRNA expression of nuclear factor (erythroid-derived 2)-like 2 (Nrf2) in nigral tissue. Methods: The effects of the unilateral neurotoxic lesion of the PPN in motor coordination evaluated through grid test and Nrf2 mRNA expression in nigral tissue were evaluated. Two experimental designs (ED) were organized: ED#1 behavioral study (7 and 30 days after PPN lesion) and ED#2 molecular biology study (24 h, 48 h and 7 days) after PPN lesion. Results: ED#1—The number of faults made with left limbs, were significant higher in the lesioned groups (p < 0.01) both 7 and 30 days post-lesion. The number of failures made by the right limbs, was also significantly higher (p < 0.05) vs. control groups. ED#2—Nrf2 mRNA expression showed an increase 24 h after PPN injury (p < 0.01), followed by a peak of expression 48 h post injury (p < 0.001). Conclusions: Disorders of motor coordination associated with PPN injury are bilateral. The increased Nrf2 mRNA expression could represent an adaptive response to oxidative stress in the nigral tissue following pontine injury.
Collapse
|
7
|
Carvajal-González A, Jacobson L, Clover L, Wickremaratchi M, Shields S, Lang B, Vincent A. Systemic delivery of human GlyR IgG antibody induces GlyR internalization into motor neurons of brainstem and spinal cord with motor dysfunction in mice. Neuropathol Appl Neurobiol 2020; 47:316-327. [PMID: 32910464 PMCID: PMC7873718 DOI: 10.1111/nan.12666] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 08/22/2020] [Indexed: 01/24/2023]
Abstract
Aims Progressive encephalomyelitis with rigidity and myoclonus (PERM) is a life‐threatening condition often associated with highly raised serum antibodies to glycine receptors (GlyRs); these bind to the surface of large neurons and interneurons in rodent brain and spinal cord sections and, in vitro, inhibit function and reduce surface expression of the GlyRs. The effects in vivo have not been reported. Methods Purified plasma IgG from a GlyR antibody‐positive patient with PERM, and a healthy control (HC), was injected daily into the peritoneal cavity of mice for 12 days; lipopolysaccharide (LPS) to open the blood–brain barrier, was injected on days 3 and 8. Based on preliminary data, behavioural tests were only performed 48 h post‐LPS on days 5–7 and 10–12. Results The GlyR IgG injected mice showed impaired ability on the rotarod from days 5 to 10 but this normalized by day 12. There were no other behavioural differences but, at termination (d13), the GlyR IgG‐injected mice had IgG deposits on the neurons that express GlyRs in the brainstem and spinal cord. The IgG was not only on the surface but also inside these large GlyR expressing neurons, which continued to express surface GlyR. Conclusions Despite the partial clinical phenotype, not uncommon in passive transfer studies, the results suggest that the antibodies had accessed the GlyRs in relevant brain regions, led to antibody‐mediated internalization and increased GlyR synthesis, compatible with the temporary loss of function.
Collapse
Affiliation(s)
- A Carvajal-González
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK
| | - L Jacobson
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK
| | - L Clover
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK
| | - M Wickremaratchi
- Hurstwood Park Neurological Centre, Brighton and Sussex University Hospitals NHS Trust, West Sussex, UK
| | - S Shields
- Neurosciences Department, Taunton and Somerset NS Foundation Trust, Musgrove Park Hospital, Taunton, UK
| | - B Lang
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK
| | - A Vincent
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford, UK
| |
Collapse
|
8
|
Fan L, Li X, Liu T. Asiaticoside Inhibits Neuronal Apoptosis and Promotes Functional Recovery After Spinal Cord Injury in Rats. J Mol Neurosci 2020; 70:1988-96. [PMID: 32529536 DOI: 10.1007/s12031-020-01601-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 10/10/2019] [Indexed: 12/17/2022]
Abstract
Spinal cord injury is a critical traumatic injury. This study aimed to investigate the possible protective effects of asiaticoside on neuronal injury in a rat model of spinal cord injury and to clarify the possible molecular mechanisms underlying these protective effects. Rats were randomly divided into the following four groups: naïve, sham, spinal cord injury (moderate mechanical compression injury model), and spinal cord injury + asiaticoside. Time to spontaneous urination after spinal cord injury was measured. The Basso-Beattie-Bresnahan scoring method, inclined plate grasp experiments, and footprint experiments were used to evaluate motor function. Neuritin and TNF-α levels in the spinal cord were detected via ELISA, and caspase-3 level was detected via Western blotting. Spinal cord morphology was assessed via hematoxylin-eosin staining. Apoptosis in the spinal cord was assessed using Fluoro-Jade B staining. Recovery times for spontaneous urination and motor function were shorter in the spinal cord injury + asiaticoside group than in the spinal cord injury group. The neuritin level was increased and TNF-α and caspase-3 levels were decreased in the spinal cord injury + asiaticoside group. Morphological integrity of neurons was better in the spinal cord injury + asiaticoside group than in the spinal cord injury group. It can thus be said that asiaticoside decreased apoptosis of spinal cord neurons. Asiaticoside exerts protective effects against spinal cord injury in rats, possibly by inhibiting the apoptosis of neurons and anti-inflammatory mechanisms.
Collapse
|
9
|
Richards TM, Sharma P, Kuang A, Whitty D, Ahmed Z, Shah PK. Novel Speed-Controlled Automated Ladder Walking Device Reveals Walking Speed as a Critical Determinant of Skilled Locomotion after a Spinal Cord Injury in Adult Rats. J Neurotrauma 2019; 36:2698-2721. [DOI: 10.1089/neu.2018.6152] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Affiliation(s)
- Tiffany M. Richards
- Department of Neurobiology and Behavior, Stony Brook University, Stony Brook, New York
| | - Pawan Sharma
- Department of Physical Therapy, Stony Brook University, Stony Brook, New York
| | - Aaron Kuang
- Department of Physical Therapy, Stony Brook University, Stony Brook, New York
| | - Douglas Whitty
- Department of Physical Therapy, Stony Brook University, Stony Brook, New York
| | - Zaghloul Ahmed
- Department of Physical Therapy, Center for Developmental Neuroscience, The College of Staten Island, Staten Island, New York
- Graduate Center, City University of New York, New York, New York
| | - Prithvi K. Shah
- Department of Neurobiology and Behavior, Stony Brook University, Stony Brook, New York
- Department of Physical Therapy, Stony Brook University, Stony Brook, New York
| |
Collapse
|
10
|
Ahmed RU, Alam M, Zheng YP. Experimental spinal cord injury and behavioral tests in laboratory rats. Heliyon 2019; 5:e01324. [PMID: 30906898 PMCID: PMC6411514 DOI: 10.1016/j.heliyon.2019.e01324] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 11/01/2018] [Accepted: 03/04/2019] [Indexed: 12/15/2022] Open
Abstract
Traumatic spinal cord injury (SCI) results in some serious neurophysiological consequences that alter healthy body functions and devastate the quality of living of individuals. To find a cure for SCI, researchers around the world are working on different neurorepair and neurorehabilitation modalities. To test a new treatment for SCI as well as to understand the mechanism of recovery, animal models are being widely used. Among them, SCI rat models are arguably the most prominent. Furthermore, it is important to select a suitable behavioral test to evaluate both the motor and sensory recovery following any therapeutic intervention. In this paper, we review the rat models of spinal injury and commonly used behavioral tests to serve as a useful guideline for neuroscientists in the field of SCI research.
Collapse
Affiliation(s)
- Rakib Uddin Ahmed
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong
| | - Monzurul Alam
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong
| | - Yong-Ping Zheng
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong
| |
Collapse
|
11
|
Magaz A, Faroni A, Gough JE, Reid AJ, Li X, Blaker JJ. Bioactive Silk-Based Nerve Guidance Conduits for Augmenting Peripheral Nerve Repair. Adv Healthc Mater 2018; 7:e1800308. [PMID: 30260575 DOI: 10.1002/adhm.201800308] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Revised: 05/22/2018] [Indexed: 02/03/2023]
Abstract
Repair of peripheral nerve injuries depends upon complex biology stemming from the manifold and challenging injury-healing processes of the peripheral nervous system. While surgical treatment options are available, they tend to be characterized by poor clinical outcomes for the injured patients. This is particularly apparent in the clinical management of a nerve gap whereby nerve autograft remains the best clinical option despite numerous limitations; in addition, effective repair becomes progressively more difficult with larger gaps. Nerve conduit strategies based on tissue engineering approaches and the use of silk as scaffolding material have attracted much attention in recent years to overcome these limitations and meet the clinical demand of large gap nerve repair. This review examines the scientific advances made with silk-based conduits for peripheral nerve repair. The focus is on enhancing bioactivity of the conduits in terms of physical guidance cues, inner wall and lumen modification, and imbuing novel conductive functionalities.
Collapse
Affiliation(s)
- Adrián Magaz
- Bio‐Active Materials GroupSchool of MaterialsMSS TowerThe University of Manchester Manchester M13 9PL UK
- Institute of Materials Research and Engineering (IMRE)Agency for Science Technology and Research (A*STAR) 2 Fusionopolis, Way, Innovis #08‐03 Singapore 138634 Singapore
| | - Alessandro Faroni
- Blond McIndoe LaboratoriesDivision of Cell Matrix Biology and Regenerative MedicineSchool of Biological SciencesFaculty of Biology, Medicine and HealthThe University of ManchesterManchester Academic Health Science Centre Manchester M13 9PL UK
| | - Julie E. Gough
- School of MaterialsThe University of Manchester Manchester M13 9PL UK
| | - Adam J. Reid
- Blond McIndoe LaboratoriesDivision of Cell Matrix Biology and Regenerative MedicineSchool of Biological SciencesFaculty of Biology, Medicine and HealthThe University of ManchesterManchester Academic Health Science Centre Manchester M13 9PL UK
- Department of Plastic Surgery and BurnsWythenshawe HospitalManchester University NHS Foundation TrustManchester Academic Health Science Centre Manchester M23 9LT UK
| | - Xu Li
- Institute of Materials Research and Engineering (IMRE)Agency for Science Technology and Research (A*STAR) 2 Fusionopolis, Way, Innovis #08‐03 Singapore 138634 Singapore
| | - Jonny J. Blaker
- Bio‐Active Materials GroupSchool of MaterialsMSS TowerThe University of Manchester Manchester M13 9PL UK
- School of MaterialsThe University of Manchester Manchester M13 9PL UK
| |
Collapse
|
12
|
Valdez SI, González-Sandoval J, Dueñas-Jiménez S, Franco Rodríguez NE, Torres-Ramos S, Mendizabal-Ruiz G. Modeling hind-limb kinematics using a bio-inspired algorithm with a local search. Biomed Eng Online 2018; 17:134. [PMID: 30458788 PMCID: PMC6245690 DOI: 10.1186/s12938-018-0565-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Laboratory rats play a critical role in research because they provide a biological model that can be used for evaluating the affectation of diseases and injuries, and for the evaluation of the effectiveness of new drugs and treatments. The analysis of locomotion in laboratory rats facilitates the understanding of motor defects in many diseases, as well as the damage and recovery after peripheral and central nervous system injuries. However, locomotion analysis of rats remains a great challenge due to the necessity of labor intensive manual annotations of video data required to obtain quantitative measurements of the kinematics of the rodent extremities. In this work, we present a method that is based on the use of a bio-inspired algorithm that fits a kinematic model of the hind limbs of rats to binary images corresponding to the segmented marker of images corresponding to the rat's gait. The bio-inspired algorithm combines a genetic algorithm for a group of the optimization variables with a local search for a second group of the optimization variables. RESULTS Our results indicate the feasibility of employing the proposed approach for the automatic annotation and analysis of the locomotion patterns of the posterior extremities of laboratory rats. CONCLUSIONS The adjustment of the hind limb kinematic model to markers of the video frames corresponding to rat's gait sequences could then be used to analyze the motion patterns during the steps, which, in turn, can be useful for performing quantitative evaluations of the effect of lesions and treatments on rats models.
Collapse
Affiliation(s)
- S Ivvan Valdez
- División de Ingenierías, Universidad de Guanajuato, Carr. Salamanca-Valle de Santiago km 3.5+1.8, 36885, Salamanca, Guanajuato, México
| | - Josué González-Sandoval
- Departamento de Ciencias Computacionales, Universidad de Guadalajara, Av.Revolución 1500, Guadalajara, Jalisco, México
| | - Sergio Dueñas-Jiménez
- Departamento de Neurociencias, Universidad de Guadalajara, Sierra Mojada 950, Guadalajara, Jalisco, México
| | - Nancy Elizabeth Franco Rodríguez
- Departamento de Farmacobiología, Universidad de Guadalajara, Blvd. Marcelino García Barragan, 1421, Guadalajara, Jalisco, México
| | - Sulema Torres-Ramos
- Departamento de Ciencias Computacionales, Universidad de Guadalajara, Av.Revolución 1500, Guadalajara, Jalisco, México
| | - Gerardo Mendizabal-Ruiz
- Departamento de Ciencias Computacionales, Universidad de Guadalajara, Av.Revolución 1500, Guadalajara, Jalisco, México.
| |
Collapse
|
13
|
Lee YS, Funk LH, Lee JK, Bunge MB. Macrophage depletion and Schwann cell transplantation reduce cyst size after rat contusive spinal cord injury. Neural Regen Res 2018; 13:684-691. [PMID: 29722321 PMCID: PMC5950679 DOI: 10.4103/1673-5374.230295] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/22/2018] [Indexed: 01/07/2023] Open
Abstract
Schwann cell transplantation is a promising therapy for the treatment of spinal cord injury (SCI) and is currently in clinical trials. In our continuing efforts to improve Schwann cell transplantation strategies, we sought to determine the combined effects of Schwann cell transplantation with macrophage depletion. Since macrophages are major inflammatory contributors to the acute spinal cord injury, and are the major phagocytic cells, we hypothesized that transplanting Schwann cells after macrophage depletion will improve cell survival and integration with host tissue after SCI. To test this hypothesis, rat models of contusive SCI at thoracic level 8 were randomly subjected to macrophage depletion or not. In rat subjected to macrophage depletion, liposomes filled with clodronate were intraperitoneally injected at 1, 3, 6, 11, and 18 days post injury. Rats not subjected to macrophage depletion were intraperitoneally injected with liposomes filled with phosphate buffered saline. Schwann cells were transplanted 1 week post injury in all rats. Biotinylated dextran amine (BDA) was injected at thoracic level 5 to evalute axon regeneration. The Basso, Beattie, and Bresnahan locomotor test, Gridwalk test, and sensory test using von Frey filaments were performed to assess functional recovery. Immunohistochemistry was used to detect glial fibrillary acidic protein, neurofilament, and green fluorescent protein (GFP), and also to visulize BDA-labelled axons. The GFP labeled Schwann cell and cyst and lesion volumes were quantified using stained slides. The numbers of BDA-positive axons were also quantified. At 8 weeks after Schwann cell transplantation, there was a significant reduction in cyst and lesion volumes in the combined treatment group compared to Schwann cell transplantation alone. These changes were not associated, however, with improved Schwann cell survival, axon growth, or locomotor recovery. Although combining Schwann cell transplantation with macrophage depletion does improve histopathology of the injury site, the effect on axon growth and behavioral recovery appears no better than what can be achieved with Schwann cell transplants alone.
Collapse
Affiliation(s)
- Yee-Shuan Lee
- The Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Lucy H. Funk
- The Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Jae K. Lee
- The Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, FL, USA
- Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Mary Bartlett Bunge
- The Miami Project to Cure Paralysis, University of Miami Miller School of Medicine, Miami, FL, USA
- Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, FL, USA
- Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL, USA
| |
Collapse
|
14
|
Uezono N, Zhu Y, Fujimoto Y, Yasui T, Matsuda T, Nakajo M, Abematsu M, Setoguchi T, Mori S, Takahashi HK, Komiya S, Nishibori M, Nakashima K. Prior Treatment with Anti-High Mobility Group Box-1 Antibody Boosts Human Neural Stem Cell Transplantation-Mediated Functional Recovery After Spinal Cord Injury. Stem Cells 2018. [PMID: 29517828 DOI: 10.1002/stem.2802] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Together with residual host neurons, transplanted neural stem cell (NSC)-derived neurons play a critical role in reconstructing disrupted neural circuits after spinal cord injury (SCI). Since a large number of tracts are disrupted and the majority of host neurons die around the lesion site as the damage spreads, minimizing this spreading and preserving the lesion site are important for attaining further improvements in reconstruction. High mobility group box-1 (HMGB1) is a damage-associated molecular pattern protein that triggers sterile inflammation after tissue injury. In the ischemic and injured brain, neutralization of HMGB1 with a specific antibody reportedly stabilizes the blood-brain barrier, suppresses inflammatory cytokine expression, and improves functional recovery. Using a SCI model mouse, we here developed a combinatorial treatment for SCI: administering anti-HMGB1 antibody prior to transplantation of NSCs derived from human induced pluripotent stem cells (hiPSC-NSCs) yielded a dramatic improvement in locomotion recovery after SCI. Even anti-HMGB1 antibody treatment alone alleviated blood-spinal cord barrier disruption and edema formation, and increased the number of neurites from spared axons and the survival of host neurons, resulting in functional recovery. However, this recovery was greatly enhanced by the subsequent hiPSC-NSC transplantation, reaching an extent that has never before been reported. We also found that this improved recovery was directly associated with connections established between surviving host neurons and transplant-derived neurons. Taken together, our results highlight combinatorial treatment with anti-HMGB1 antibody and hiPSC-NSC transplantation as a promising novel therapy for SCI. Stem Cells 2018;36:737-750.
Collapse
Affiliation(s)
- Naohiro Uezono
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan.,Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Yicheng Zhu
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan
| | - Yusuke Fujimoto
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Tetsuro Yasui
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan
| | - Taito Matsuda
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan
| | - Masahide Nakajo
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan.,Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Masahiko Abematsu
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Takao Setoguchi
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Shuji Mori
- Department of Pharmacology, School of Pharmacy, Shujitsu University, Naka-ku, Okayama, Japan
| | - Hideo K Takahashi
- Department of Pharmacology, Kinki University, Faculty of Medicine, Osaka-Sayama, Japan
| | - Setsuro Komiya
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Masahiro Nishibori
- Department of Pharmacology, Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University, Kita-ku, Okayama, Japan
| | - Kinichi Nakashima
- Department of Stem Cell Biology and Medicine, Graduate School of Medical Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan
| |
Collapse
|
15
|
Grünewald B, Lange MD, Werner C, O'Leary A, Weishaupt A, Popp S, Pearce DA, Wiendl H, Reif A, Pape HC, Toyka KV, Sommer C, Geis C. Defective synaptic transmission causes disease signs in a mouse model of juvenile neuronal ceroid lipofuscinosis. eLife 2017; 6:28685. [PMID: 29135436 PMCID: PMC5724993 DOI: 10.7554/elife.28685] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 11/13/2017] [Indexed: 12/21/2022] Open
Abstract
Juvenile neuronal ceroid lipofuscinosis (JNCL or Batten disease) caused by mutations in the CLN3 gene is the most prevalent inherited neurodegenerative disease in childhood resulting in widespread central nervous system dysfunction and premature death. The consequences of CLN3 mutation on the progression of the disease, on neuronal transmission, and on central nervous network dysfunction are poorly understood. We used Cln3 knockout (Cln3Δex1-6) mice and found increased anxiety-related behavior and impaired aversive learning as well as markedly affected motor function including disordered coordination. Patch-clamp and loose-patch recordings revealed severely affected inhibitory and excitatory synaptic transmission in the amygdala, hippocampus, and cerebellar networks. Changes in presynaptic release properties may result from dysfunction of CLN3 protein. Furthermore, loss of calbindin, neuropeptide Y, parvalbumin, and GAD65-positive interneurons in central networks collectively support the hypothesis that degeneration of GABAergic interneurons may be the cause of supraspinal GABAergic disinhibition.
Collapse
Affiliation(s)
- Benedikt Grünewald
- Hans-Berger Department of Neurology, Jena University Hospital, Jena, Germany.,Integrated Research and Treatment Center-Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| | - Maren D Lange
- Institute of Physiology I, University of Münster, Münster, Germany
| | - Christian Werner
- Hans-Berger Department of Neurology, Jena University Hospital, Jena, Germany.,Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| | - Aet O'Leary
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital Frankfurt, Frankfurt, Germany
| | - Andreas Weishaupt
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| | - Sandy Popp
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Würzburg, Würzburg, Germany
| | - David A Pearce
- Sanford Children's Health Research Center, Sanford Research, Sioux Falls, United States
| | - Heinz Wiendl
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany.,Department of Neurology, University of Münster, Münster, Germany
| | - Andreas Reif
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital Frankfurt, Frankfurt, Germany
| | - Hans C Pape
- Institute of Physiology I, University of Münster, Münster, Germany
| | - Klaus V Toyka
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| | - Claudia Sommer
- Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| | - Christian Geis
- Hans-Berger Department of Neurology, Jena University Hospital, Jena, Germany.,Integrated Research and Treatment Center-Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany.,Department of Neurology, University Hospital Würzburg, Würzburg, Germany
| |
Collapse
|
16
|
von Leden RE, Khayrullina G, Moritz KE, Byrnes KR. Age exacerbates microglial activation, oxidative stress, inflammatory and NOX2 gene expression, and delays functional recovery in a middle-aged rodent model of spinal cord injury. J Neuroinflammation 2017; 14:161. [PMID: 28821269 PMCID: PMC5563003 DOI: 10.1186/s12974-017-0933-3] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 08/04/2017] [Indexed: 12/17/2022] Open
Abstract
Background Spinal cord injury (SCI) among people over age 40 has been steadily increasing since the 1980s and is associated with worsened outcome than injuries in young people. Age-related increases in reactive oxygen species (ROS) are suggested to lead to chronic inflammation. The NADPH oxidase 2 (NOX2) enzyme is expressed by microglia and is a primary source of ROS. This study aimed to determine the effect of age on inflammation, oxidative damage, NOX2 gene expression, and functional performance with and without SCI in young adult (3 months) and middle-aged (12 months) male rats. Methods Young adult and middle-aged rats were assessed in two groups—naïve and moderate contusion SCI. Functional recovery was determined by weekly assessment with the Basso, Beattie, and Breshnahan general motor score (analyzed two-way ANOVA) and footprint analysis (analyzed by Chi-square analysis). Tissue was analyzed for markers of oxidative damage (8-OHdG, Oxyblot, and 3-NT), microglial-related inflammation (Iba1), NOX2 component (p47PHOX, p22PHOX, and gp91PHOX), and inflammatory (CD86, CD206, TNFα, and NFκB) gene expression (all analyzed by unpaired Student’s t test). Results In both naïve and injured aged rats, compared to young rats, tissue analysis revealed significant increases in 8-OHdG and Iba1, as well as inflammatory and NOX2 component gene expression. Further, injured aged rats showed greater lesion volume rostral and caudal to the injury epicenter. Finally, injured aged rats showed significantly reduced Basso–Beattie–Bresnahan (BBB) scores and stride length after SCI. Conclusions These results show that middle-aged rats demonstrate increased microglial activation, oxidative stress, and inflammatory gene expression, which may be related to elevated NOX2 expression, and contribute to worsened functional outcome following injury. These findings are essential to elucidating the mechanisms of age-related differences in response to SCI and developing age-appropriate therapeutics.
Collapse
Affiliation(s)
- Ramona E von Leden
- Neuroscience Program, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA. .,Department of Anatomy, Physiology, and Genetics, Uniformed Services University, Room C2099, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - Guzal Khayrullina
- Neuroscience Program, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.,Department of Anatomy, Physiology, and Genetics, Uniformed Services University, Room C2099, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA
| | - Kasey E Moritz
- Neuroscience Program, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA
| | - Kimberly R Byrnes
- Neuroscience Program, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.,Department of Anatomy, Physiology, and Genetics, Uniformed Services University, Room C2099, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA
| |
Collapse
|
17
|
Kappos EA, Sieber PK, Engels PE, Mariolo AV, D'Arpa S, Schaefer DJ, Kalbermatten DF. Validity and reliability of the CatWalk system as a static and dynamic gait analysis tool for the assessment of functional nerve recovery in small animal models. Brain Behav 2017; 7:e00723. [PMID: 28729931 PMCID: PMC5516599 DOI: 10.1002/brb3.723] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Revised: 11/15/2016] [Accepted: 03/22/2017] [Indexed: 12/21/2022] Open
Abstract
INTRODUCTION A range of behavioral testing paradigms have been developed for the research of central and peripheral nerve injuries with the help of small animal models. Following any nerve repair strategy, improved functional outcome may be the most important evidence of axon regeneration. A novel automated gait analysis system, the CatWalk™, can measure dynamic as well as static gait patterns of small animals. Of most interest in detecting functional recovery are in particular dynamic gait parameters, coordination measures, and the intensity of the animals paw prints. This article is designed to lead to a more efficient choice of CatWalk parameters in future studies concerning the functional evaluation of nerve regeneration and simultaneously add to better interstudy comparability. METHODS The aims of the present paper are threefold: (1) to describe the functional method of CatWalk gait analysis, (2) to characterize different parameters acquired by CatWalk gait analysis, and to find the most frequently used parameters as well as (3) to compare their reliability and validity throughout the different studies. RESULTS In the reviewed articles, the most frequently used parameters were Swing Duration (30), Print Size (27), Stride Length (26), and Max Contact Area (24). Swing Duration was not only frequently used but was also the most reliable and valid parameter. Therefore, we hypothesize that Swing Duration constitutes an important parameter to be chosen for future studies, as it has the highest level of reliability and validity. CONCLUSION In conclusion, CatWalk can be used as a complementary approach to other behavioral testing paradigms to assess clinically relevant behavioral benefits, with the main advantage that this system demonstrates both static and dynamic gait parameters at the same time. Due to limited reliability and validity of certain parameters, we recommend that only the most frequently assessed parameters should be used in the future.
Collapse
Affiliation(s)
- Elisabeth A Kappos
- Division of Plastic, Reconstructive, Aesthetic and Hand Surgery Department of Surgery University Hospital of Basel Basel Switzerland.,Division of Neuropathology Institute of Pathology University Hospital of Basel Basel Switzerland
| | - Patricia K Sieber
- Division of Plastic, Reconstructive, Aesthetic and Hand Surgery Department of Surgery University Hospital of Basel Basel Switzerland.,Division of Neuropathology Institute of Pathology University Hospital of Basel Basel Switzerland
| | - Patricia E Engels
- Division of Plastic, Reconstructive, Aesthetic and Hand Surgery Department of Surgery University Hospital of Basel Basel Switzerland.,Division of Neuropathology Institute of Pathology University Hospital of Basel Basel Switzerland
| | - Alessio V Mariolo
- Plastic and Reconstructive Surgery Department of Surgery, Oncology and Stomatology University of Palermo Palermo Italy
| | - Salvatore D'Arpa
- Division of Plastic and Reconstructive Surgery Department of Surgery Ghent University Hospital Gent Belgium
| | - Dirk J Schaefer
- Division of Plastic, Reconstructive, Aesthetic and Hand Surgery Department of Surgery University Hospital of Basel Basel Switzerland
| | - Daniel F Kalbermatten
- Division of Plastic, Reconstructive, Aesthetic and Hand Surgery Department of Surgery University Hospital of Basel Basel Switzerland.,Division of Neuropathology Institute of Pathology University Hospital of Basel Basel Switzerland
| |
Collapse
|
18
|
Tuszynski MH, Murai K, Blesch A, Grill R, Miller I. Functional Characterization of Ngf-Secreting Cell Grafts to the Acutely Injured Spinal Cord. Cell Transplant 2017; 6:361-8. [PMID: 9171168 DOI: 10.1177/096368979700600318] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [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: 11/17/2022] Open
Abstract
Previously we reported that grafts of cells genetically modified to produce human nerve growth factor (hNGF) promoted specific and robust sprouting of spinal sensory, motor, and noradrenergic axons. In the present study we extend these investigations to assess NGF effects on corticospinal motor axons and on functional outcomes after spinal cord injury. Fibroblasts from adult rats were transduced to express human NGF; control cells were not genetically modified. Fibroblasts were then grafted to sites of midthoracic spinal cord dorsal hemisection lesions. Three months later, recipients of NGF-secreting grafts showed deficits on conditioned locomotion over a wire mesh that did not differ in extent from control-lesioned animals. On histological examination, NGF-secreting grafts elicited specific sprouting from spinal primary sensory afferent axons, local motor axons, and putative cerulospinal axons as previously reported, but no specific responses from corticospinal axons. Axons responding to NGF robustly penetrated the grafts but did not exit the grafts to extend to normal innervation territories distal to grafts. Grafted cells continued to express NGF protein through the experimental period of the study. These findings indicate that 1) spinal cord axons show directionally sensitive growth responses to neurotrophic factors, 2) growth of axons responding to a neurotrophic factor beyond an injury site and back to their natural target regions will likely require delivery of concentration gradients of neurotrophic factors toward the target, 3) corticospinal axons do not grow toward a cellular source of NGF, and 4) functional impairments are not improved by strictly local sprouting response of nonmotor systems.
Collapse
Affiliation(s)
- M H Tuszynski
- Department of Neurosciences, University of California-San Diego, La Jolla 92093-0608, USA
| | | | | | | | | |
Collapse
|
19
|
Batty NJ, Fenrich KK, Fouad K. The role of cAMP and its downstream targets in neurite growth in the adult nervous system. Neurosci Lett 2016; 652:56-63. [PMID: 27989572 DOI: 10.1016/j.neulet.2016.12.033] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 12/13/2016] [Accepted: 12/14/2016] [Indexed: 01/23/2023]
Abstract
Injured neurons in the adult mammalian central nervous system (CNS) have a very limited capacity for axonal regeneration and neurite outgrowth. This inability to grow new axons or to regrow injured axons is due to the presence of molecules that inhibit axonal growth, and age related changes in the neuron's innate growth capabilities. Available levels of cAMP are thought to have an important role in linking both of these factors. Elevated levels of cAMP in the developing nervous system are important for the guidance and stability of growth cones. As the nervous system matures, cAMP levels decline and the growth promoting effects of cAMP diminish. It has frequently been demonstrated that increasing neuronal cAMP can enhance neurite growth and regeneration. Some methods used to increase cAMP include administration of cAMP agonists, conditioning lesions, or electrical stimulation. Furthermore, it has been proposed that multiple stages of cAMP induced growth exist, one directly caused by its downstream effector Protein Kinase A (PKA) and one caused by the eventual upregulation of gene transcription. Although the role cAMP in promoting axon growth is well accepted, the downstream pathways that mediate cAMP-mediated axonal growth are less clear. This is partly because various key studies that explored the link between PKA and axonal outgrowth relied on the PKA inhibitors KT5720 and H89. More recent studies have shown that both of these drugs are less specific than initially thought and can inhibit a number of other signalling molecules including the Exchange Protein Activated by cAMP (EPAC). Consequently, it has recently been shown that a number of intracellular signalling pathways previously attributed to PKA can now be attributed solely to activation of EPAC specific pathways, or the simultaneous co-activation of PKA and EPAC specific pathways. These new studies open the door to new potential treatments for repairing the injured spinal cord.
Collapse
Affiliation(s)
- Nicholas J Batty
- Neuroscience and Mental Health Institute, 3-88 Corbett Hall, University of Alberta, Edmonton, AB T6E 2G4, Canada
| | - Keith K Fenrich
- Neuroscience and Mental Health Institute, 3-88 Corbett Hall, University of Alberta, Edmonton, AB T6E 2G4, Canada; Department of Physical Therapy, 3-88 Corbett Hall, University of Alberta, Edmonton, AB T6E 2G4, Canada
| | - Karim Fouad
- Neuroscience and Mental Health Institute, 3-88 Corbett Hall, University of Alberta, Edmonton, AB T6E 2G4, Canada; Department of Physical Therapy, 3-88 Corbett Hall, University of Alberta, Edmonton, AB T6E 2G4, Canada.
| |
Collapse
|
20
|
Hansen C, Dinis TM, Vidal G, Ben-Mansour K, Bresson D, Egles C, Marin F. In-vivo analysis of nerve regeneration after sciatic nerve injury in a rat model. Int Biomech 2016. [DOI: 10.1080/23335432.2016.1233077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Affiliation(s)
- Clint Hansen
- Sorbonne Universités, Université de Technologie de Compiègne (UTC), Compiègne, France
| | - Tony M. Dinis
- Sorbonne Universités, Université de Technologie de Compiègne (UTC), Compiègne, France
| | - Guillaume Vidal
- Sorbonne Universités, Université de Technologie de Compiègne (UTC), Compiègne, France
| | - Khalil Ben-Mansour
- Sorbonne Universités, Université de Technologie de Compiègne (UTC), Compiègne, France
| | - Damien Bresson
- Sorbonne Universités, Université de Technologie de Compiègne (UTC), Compiègne, France
| | - Christophe Egles
- Sorbonne Universités, Université de Technologie de Compiègne (UTC), Compiègne, France
- Department of Oral and Maxillofacial Pathology, School of Dental Medicine, Tufts University, Boston, MA, USA
| | - Frédéric Marin
- Sorbonne Universités, Université de Technologie de Compiègne (UTC), Compiègne, France
| |
Collapse
|
21
|
Dhillon RS, Parker J, Syed YA, Edgley S, Young A, Fawcett JW, Jeffery ND, Franklin RJM, Kotter MRN. Axonal plasticity underpins the functional recovery following surgical decompression in a rat model of cervical spondylotic myelopathy. Acta Neuropathol Commun 2016; 4:89. [PMID: 27552807 PMCID: PMC4994254 DOI: 10.1186/s40478-016-0359-7] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 08/01/2016] [Indexed: 02/02/2023] Open
Abstract
Cervical spondylotic myelopathy (CSM) is the most common spinal cord disorder and a major cause of disability in adults. Improvements following surgical decompression are limited and patients often remain severely disabled. Post mortem studies indicate that CSM is associated with profound axonal loss. However, our understanding of the pathophysiology of CSM remains limited.To investigate the hypothesis that axonal plasticity plays a role in the recovery following surgical decompression, we adopted a novel preclinical model of mild to moderate CSM. Spinal cord compression resulted in significant locomotor deterioration, increased expression of the axonal injury marker APP, and loss of serotonergic fibres. Surgical decompression partially reversed the deficits and attenuated APP expression. Decompression was also associated with axonal sprouting, reflected in the restoration of serotonergic fibres and an increase of GAP43 expression. The re-expression of synaptophysin indicated the restoration of functional synapses following decompression. Promoting axonal plasticity may therefore be a therapeutic strategy for promoting neurological recovery in CSM.
Collapse
Affiliation(s)
- Rana S. Dhillon
- Department of Clinical Neurosciences, Anne McLaren Laboratory, Wellcome Trust-MRC Cambridge Stem Cell Institute, John van Geest Centre for Brain Repair, Academic Neurosurgery Unit, University of Cambridge, Cambridge Biomedical Campus, West Forvie Building, Forvie Site, Robinson Way, Cambridge, CB2 0SZ UK
| | - John Parker
- Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Clifford Allbutt Building, Cambridge Biomedical Campus, Cambridge, CB2 0AH UK
| | - Yasir A. Syed
- Department of Clinical Neurosciences, Anne McLaren Laboratory, Wellcome Trust-MRC Cambridge Stem Cell Institute, John van Geest Centre for Brain Repair, Academic Neurosurgery Unit, University of Cambridge, Cambridge Biomedical Campus, West Forvie Building, Forvie Site, Robinson Way, Cambridge, CB2 0SZ UK
| | - Steve Edgley
- Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge, CB2 3DY UK
| | - Adam Young
- Department of Clinical Neurosciences, Anne McLaren Laboratory, Wellcome Trust-MRC Cambridge Stem Cell Institute, John van Geest Centre for Brain Repair, Academic Neurosurgery Unit, University of Cambridge, Cambridge Biomedical Campus, West Forvie Building, Forvie Site, Robinson Way, Cambridge, CB2 0SZ UK
| | - James W. Fawcett
- Department of Clinical Neurosciences, John van Geest Centre for Brain Repair, University of Cambridge, E.D. Adrian Building, Forvie Site, Robinson Way, Cambridge, CB2 0PY UK
| | - Nick D. Jeffery
- College of Veterinary Medicine, Iowa State University, 1800 Christensen Drive, Ames, IA 50011-1134 USA
| | - Robin J. M. Franklin
- Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Clifford Allbutt Building, Cambridge Biomedical Campus, Cambridge, CB2 0AH UK
| | - Mark R. N. Kotter
- Department of Clinical Neurosciences, Anne McLaren Laboratory, Wellcome Trust-MRC Cambridge Stem Cell Institute, John van Geest Centre for Brain Repair, Academic Neurosurgery Unit, University of Cambridge, Cambridge Biomedical Campus, West Forvie Building, Forvie Site, Robinson Way, Cambridge, CB2 0SZ UK
| |
Collapse
|
22
|
Ward PJ, Herrity AN, Harkema SJ, Hubscher CH. Training-Induced Functional Gains following SCI. Neural Plast 2016; 2016:4307694. [PMID: 27403345 DOI: 10.1155/2016/4307694] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 04/27/2016] [Indexed: 12/30/2022] Open
Abstract
We previously demonstrated that daily, hour-long training sessions significantly improved both locomotor (limb kinematics, gait, and hindlimb flexor-extensor bursting patterns) and nonlocomotor (bladder function and at-level mechanical allodynia) functions following a moderate contusive spinal cord injury. The amount of training needed to achieve this recovery is unknown. Furthermore, whether this recovery is induced primarily by neuronal activity below the lesion or other aspects related to general exercise is unclear. Therefore, the current study objectives were to (1) test the efficacy of 30 minutes of step training for recovery following a clinically relevant contusion injury in male Wistar rats and (2) test the efficacy of training without hindlimb engagement. The results indicate that as little as 30 minutes of step training six days per week enhances overground locomotion in male rats with contusive spinal cord injury but does not alter allodynia or bladder function. Thirty minutes of forelimb-only exercise did not alter locomotion, allodynia, or bladder function, and neither training protocol altered the amount of in-cage activity. Taken together, locomotor improvements were facilitated by hindlimb step training for 30 minutes, but longer durations of training are required to affect nonlocomotor systems.
Collapse
|
23
|
Üçeyler N, Biko L, Hose D, Hofmann L, Sommer C. Comprehensive and differential long-term characterization of the alpha-galactosidase A deficient mouse model of Fabry disease focusing on the sensory system and pain development. Mol Pain 2016; 12:12/0/1744806916646379. [PMID: 27145802 PMCID: PMC4956180 DOI: 10.1177/1744806916646379] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 03/29/2016] [Indexed: 12/19/2022] Open
Abstract
Background Fabry disease is an X-linked lysosomal storage disorder due to impaired activity of alpha-galactosidase A with intracellular accumulation of globotriaosylceramide. Associated small fiber pathology leads to characteristic pain in Fabry disease. We systematically assessed sensory system, physical activity, metabolic parameters, and morphology of male and female mice with alpha-galactosidase A deficiency (Fabry ko) from 2 to 27 months of age and compared results with those of age- and gender-matched wild-type littermates of C57Bl/6J background. Results From the age of two months, male and female Fabry mice showed mechanical hypersensitivity (p < 0.001 each) compared to wild-type littermates. Young Fabry ko mice of both genders were hypersensitive to heat stimulation (p < 0.01) and developed heat hyposensitivity with aging (p < 0.05), while cold hyposensitivity was present constantly in young (p < 0.01) and old (p < 0.05) Fabry ko mice compared to wild-type littermates. Stride angle increased only in male Fabry ko mice with aging (p < 0.01) in comparison to wild-type littermates. Except for young female mice, male (p < 0.05) and female (p < 0.01) Fabry ko mice had a higher body weight than wild-type littermates. Old male Fabry ko mice were physically less active than their wild-type littermates (p < 0.05), had lower chow intake (p < 0.001), and lost more weight (p < 0.001) in a one-week treadmill experiment than wild-type littermates. Also, Fabry ko mice showed spontaneous pain protective behavior and developed orofacial dysmorphism resembling patients with Fabry disease. Conclusions Mice with alpha-galactosidase A deficiency show age-dependent and distinct deficits of the sensory system. alpha-galactosidase A-deficient mice seem to model human Fabry disease and may be helpful when studying the pathophysiology of Fabry-associated pain.
Collapse
Affiliation(s)
- Nurcan Üçeyler
- Department of Neurology, University of Würzburg, Würzburg, Germany
| | - Lydia Biko
- Department of Neurology, University of Würzburg, Würzburg, Germany
| | - Dorothea Hose
- Department of Neurology, University of Würzburg, Würzburg, Germany
| | - Lukas Hofmann
- Department of Neurology, University of Würzburg, Würzburg, Germany
| | - Claudia Sommer
- Department of Neurology, University of Würzburg, Würzburg, Germany
| |
Collapse
|
24
|
Song R, Oldach M, Basso D, da Costa R, Fisher L, Mo X, Moore S. A simplified method of walking track analysis to assess short-term locomotor recovery after acute spinal cord injury caused by thoracolumbar intervertebral disc extrusion in dogs. Vet J 2016; 210:61-67. [PMID: 26900008 PMCID: PMC4811708 DOI: 10.1016/j.tvjl.2016.01.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 12/03/2015] [Accepted: 01/13/2016] [Indexed: 12/12/2022]
Abstract
The purpose of this study was to evaluate a simplified method of walking track analysis to assess treatment outcome in canine spinal cord injury. Measurements of stride length (SL) and base of support (BS) were made using a 'finger painting' technique for footprint analysis in all limbs of 20 normal dogs and 27 dogs with 28 episodes of acute thoracolumbar spinal cord injury (SCI) caused by spontaneous intervertebral disc extrusion. Measurements were determined at three separate time points in normal dogs and on days 3, 10 and 30 following decompressive surgery in dogs with SCI. Values for SL, BS and coefficient of variance (COV) for each parameter were compared between groups at each time point. Mean SL was significantly shorter in all four limbs of SCI-affected dogs at days 3, 10, and 30 compared to normal dogs. SL gradually increased toward normal in the 30 days following surgery. As measured by this technique, the COV-SL was significantly higher in SCI-affected dogs than normal dogs in both thoracic limbs (TL) and pelvic limbs (PL) only at day 3 after surgery. BS-TL was significantly wider in SCI-affected dogs at days 3, 10 and 30 following surgery compared to normal dogs. These findings support the use of footprint parameters to compare locomotor differences between normal and SCI-affected dogs, and to assess recovery from SCI. Additionally, our results underscore important changes in TL locomotion in thoracolumbar SCI-affected dogs.
Collapse
Affiliation(s)
- R.B. Song
- Department of Veterinary Clinical Sciences, College of
Veterinary Medicine, The Ohio State University, 601 Vernon Tharp St., Columbus, OH 43210
USA
| | - M.S. Oldach
- Department of Veterinary Clinical Sciences, College of
Veterinary Medicine, The Ohio State University, 601 Vernon Tharp St., Columbus, OH 43210
USA
| | - D.M. Basso
- School of Health and Rehabilitation Sciences, The Ohio State
Unversity, 453 West Tenth Ave, Columbus, OH 43210 USA
| | - R.C. da Costa
- Department of Veterinary Clinical Sciences, College of
Veterinary Medicine, The Ohio State University, 601 Vernon Tharp St., Columbus, OH 43210
USA
| | - L.C. Fisher
- School of Health and Rehabilitation Sciences, The Ohio State
Unversity, 453 West Tenth Ave, Columbus, OH 43210 USA
| | - X. Mo
- Center for Biostatistics, The Ohio State University, 601 Vernon
Tharp St., Columbus, OH 43210 USA
| | - S.A. Moore
- Department of Veterinary Clinical Sciences, College of
Veterinary Medicine, The Ohio State University, 601 Vernon Tharp St., Columbus, OH 43210
USA
| |
Collapse
|
25
|
Korner G, Noain D, Ying M, Hole M, Flydal MI, Scherer T, Allegri G, Rassi A, Fingerhut R, Becu-Villalobos D, Pillai S, Wueest S, Konrad D, Lauber-Biason A, Baumann CR, Bindoff LA, Martinez A, Thöny B. Brain catecholamine depletion and motor impairment in a Th knock-in mouse with type B tyrosine hydroxylase deficiency. Brain 2015; 138:2948-63. [PMID: 26276013 DOI: 10.1093/brain/awv224] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 06/17/2015] [Indexed: 12/16/2023] Open
Abstract
Tyrosine hydroxylase catalyses the hydroxylation of L-tyrosine to l-DOPA, the rate-limiting step in the synthesis of catecholamines. Mutations in the TH gene encoding tyrosine hydroxylase are associated with the autosomal recessive disorder tyrosine hydroxylase deficiency, which manifests phenotypes varying from infantile parkinsonism and DOPA-responsive dystonia, also termed type A, to complex encephalopathy with perinatal onset, termed type B. We generated homozygous Th knock-in mice with the mutation Th-p.R203H, equivalent to the most recurrent human mutation associated with type B tyrosine hydroxylase deficiency (TH-p.R233H), often unresponsive to l-DOPA treatment. The Th knock-in mice showed normal survival and food intake, but hypotension, hypokinesia, reduced motor coordination, wide-based gate and catalepsy. This phenotype was associated with a gradual loss of central catecholamines and the serious manifestations of motor impairment presented diurnal fluctuation but did not improve with standard l-DOPA treatment. The mutant tyrosine hydroxylase enzyme was unstable and exhibited deficient stabilization by catecholamines, leading to decline of brain tyrosine hydroxylase-immunoreactivity in the Th knock-in mice. In fact the substantia nigra presented an almost normal level of mutant tyrosine hydroxylase protein but distinct absence of the enzyme was observed in the striatum, indicating a mutation-associated mislocalization of tyrosine hydroxylase in the nigrostriatal pathway. This hypomorphic mouse model thus provides understanding on pathomechanisms in type B tyrosine hydroxylase deficiency and a platform for the evaluation of novel therapeutics for movement disorders with loss of dopaminergic input to the striatum.
Collapse
Affiliation(s)
- Germaine Korner
- 1 Division of Metabolism, Department of Paediatrics, University of Zürich, Zürich, Switzerland 2 Affiliated with the Neuroscience Centre Zurich ZNZ, Zürich, Switzerland 3 Affiliated with the Children's Research Centre CRC, Zürich, Switzerland
| | - Daniela Noain
- 4 Department of Neurology, University Hospital of Zurich, Zürich, Switzerland
| | - Ming Ying
- 5 Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Magnus Hole
- 5 Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Marte I Flydal
- 5 Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Tanja Scherer
- 1 Division of Metabolism, Department of Paediatrics, University of Zürich, Zürich, Switzerland 3 Affiliated with the Children's Research Centre CRC, Zürich, Switzerland
| | - Gabriella Allegri
- 1 Division of Metabolism, Department of Paediatrics, University of Zürich, Zürich, Switzerland 3 Affiliated with the Children's Research Centre CRC, Zürich, Switzerland
| | - Anahita Rassi
- 6 Division of Clinical Chemistry and Biochemistry, Department of Paediatrics, University of Zürich, Zürich, Switzerland
| | - Ralph Fingerhut
- 7 Swiss Newborn Screening Laboratory, University Children's Hospital, Zurich, Switzerland 3 Affiliated with the Children's Research Centre CRC, Zürich, Switzerland
| | | | - Samyuktha Pillai
- 9 Institute of Physiology, University of Zurich, Zürich, Switzerland
| | - Stephan Wueest
- 3 Affiliated with the Children's Research Centre CRC, Zürich, Switzerland 10 Division of Endocrinology, Department of Pediatrics, University of Zurich, Switzerland
| | - Daniel Konrad
- 3 Affiliated with the Children's Research Centre CRC, Zürich, Switzerland 10 Division of Endocrinology, Department of Pediatrics, University of Zurich, Switzerland
| | - Anna Lauber-Biason
- 11 Department of Medicine, University of Fribourg, Fribourg, Switzerland
| | - Christian R Baumann
- 2 Affiliated with the Neuroscience Centre Zurich ZNZ, Zürich, Switzerland 4 Department of Neurology, University Hospital of Zurich, Zürich, Switzerland
| | - Laurence A Bindoff
- 12 Department of Clinical Medicine K1, University of Bergen, Norway 13 Department of Neurology, Haukeland University Hospital, Bergen, Norway
| | - Aurora Martinez
- 5 Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Beat Thöny
- 1 Division of Metabolism, Department of Paediatrics, University of Zürich, Zürich, Switzerland 2 Affiliated with the Neuroscience Centre Zurich ZNZ, Zürich, Switzerland 3 Affiliated with the Children's Research Centre CRC, Zürich, Switzerland
| |
Collapse
|
26
|
Lee CS, Bentley RT, Weng HY, Breur GJ. A preliminary evaluation of the reliability of a modified functional scoring system for assessing neurologic function in ambulatory thoracolumbar myelopathy dogs. BMC Vet Res 2015; 11:241. [PMID: 26403185 PMCID: PMC4583166 DOI: 10.1186/s12917-015-0557-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 09/21/2015] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND The objective of this study was to develop and assess the reliability of a modified scoring system for evaluating the function of the two pelvic limbs separately, in ambulatory thoracolumbar myelopathy dogs. A previously established neurologic score scale for dogs with T3-L3 lesions was modified in order to provide a separate score for each pelvic limb. RESULTS Seventeen ambulatory dogs with thoracolumbar myelopathies were evaluated. Using the new scale, two observers independently performed 22 observational gait analyses (OGAs) in ten dogs without videotape. Another 18 OGAs were performed in seven dogs by watching videotapes of them ambulating. There was poor agreement (concordance correlation coefficient, 0.87) between the two observers for all 40 OGAs. When stratified, the agreement was moderate (concordance correlation coefficient, 0.90) in the OGAs without videotaping and poor (concordance correlation coefficient, 0.80) for the OGAs based on videotapes. For the decision regarding which pelvic limb was more severely affected, a fair agreement (kappa value, 0.30) between the two observers was noted. Without videotape there was only slight agreement (kappa value, 0.05), but with videotape there was moderate agreement (kappa value, 0.56). CONCLUSIONS The modified scoring system in this study provides moderate reliability in assessing the functional neurologic status of each pelvic limb, by OGA without videotape, in canine T3-L3 patients. Further development of this scoring system is required. However, imperfect agreement when visually quantifying neurological deficits is not unexpected.
Collapse
Affiliation(s)
- Chung-Sheng Lee
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University, 625 Harrison Street, West Lafayette, IN, 47907, USA. .,Present Address: Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Starkville, MS, 39762, USA.
| | - R Timothy Bentley
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University, 625 Harrison Street, West Lafayette, IN, 47907, USA.
| | - Hsin-Yi Weng
- Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University, 625 Harrison Street, West Lafayette, IN, 47907, USA.
| | - Gert J Breur
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Purdue University, 625 Harrison Street, West Lafayette, IN, 47907, USA.
| |
Collapse
|
27
|
Bonetti LV, Ilha J, Schneider APK, Barbosa S, Faccioni-Heuser MC. Balance and coordination training, but not endurance training, enhances synaptophysin and neurotrophin-3 immunoreactivity in the lumbar spinal cord after sciatic nerve crush. Muscle Nerve 2015; 53:617-25. [PMID: 26316168 DOI: 10.1002/mus.24889] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 08/19/2015] [Accepted: 08/25/2015] [Indexed: 11/08/2022]
Abstract
INTRODUCTION Numerous rehabilitation treatments have been shown to be useful for peripheral and central restoration after (PNI). METHODS After sciatic nerve crush, we investigated 4 weeks of endurance training (ET) and balance and coordination training (BCT) with sciatic function index, hind-paw stride length, and spinal cord dorsal horn synaptophysin and neurotrophin-3 immunoreactivity. RESULTS Our results demonstrated no significant differences between the non-trained (NT), ET, and BCT groups in sciatic functional index, and in stride-length analysis, but the ET showed higher values compared with the NT group. Synaptophysin immunoreactivity was higher in the BCT group compared with the NT group, and neurotrophin-3 immunoreactivity in the BCT group was greater compared with the other groups. CONCLUSION BCT can positively affect spinal cord plasticity after a (PNI), and these modifications are important in the rehabilitation process.
Collapse
Affiliation(s)
- Leandro Viçosa Bonetti
- Programa de Pós-Graduação em Neurociências, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.,Laboratório de Histofisiologia Comparada, Departamento de Ciências Morfológicas, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Sarmento Leite 500, CEP 90050-170, Porto Alegre, Rio Grande do Sul, Brazil
| | - Jocemar Ilha
- Laboratório de Pesquisa Experimental, Departamento de Fisioterapia, Universidade do Estado de Santa Catarina, Santa Catarina, Brazil
| | - Ana Paula Krauthein Schneider
- Laboratório de Histofisiologia Comparada, Departamento de Ciências Morfológicas, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Sarmento Leite 500, CEP 90050-170, Porto Alegre, Rio Grande do Sul, Brazil
| | - Silvia Barbosa
- Laboratório de Histofisiologia Comparada, Departamento de Ciências Morfológicas, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Sarmento Leite 500, CEP 90050-170, Porto Alegre, Rio Grande do Sul, Brazil
| | - Maria Cristina Faccioni-Heuser
- Programa de Pós-Graduação em Neurociências, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.,Laboratório de Histofisiologia Comparada, Departamento de Ciências Morfológicas, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Sarmento Leite 500, CEP 90050-170, Porto Alegre, Rio Grande do Sul, Brazil
| |
Collapse
|
28
|
Nishida F, Zanuzzi CN, Martínez A, Barbeito CG, Portiansky EL. Functional and histopathological changes induced by intraparenchymal injection of kainic acid in the rat cervical spinal cord. Neurotoxicology 2015; 49:68-78. [PMID: 26014486 DOI: 10.1016/j.neuro.2015.05.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 04/27/2015] [Accepted: 05/12/2015] [Indexed: 01/04/2023]
Abstract
Kainic acid (KA) is an analog of the neurotransmitter glutamate and is widely used as an excitotoxic agent to lesion spinal cord networks, thus, providing an interesting model to learn basic mechanisms of spinal cord injury. The present work was aimed to evaluate motor and sensory performance of rats and analyze morphometric parameters of spinal cord neurons after KA injection. Animals were injected either with 0.75, 1 or 1.25 mM of KA at the C5 segment of the cervical spinal cord. Motor and sensory performance of the rats were evaluate at day 0 (before injection) and at days 1, 2, 3 and 7 post-injection (pi) and compared with those of saline-treated and non-operated animals. Animals were sacrificed at each time point for morphometric and histopathological analysis and compared among groups. All KA-treated animals showed a significant impairment at the motor and sensory tests for the ipsilateral forelimb in a concentration-dependent manner in comparison to saline-treated and non-operated animals. Neuronal cell count showed a significant loss of neurons at C4, C5 and C6 cervical segments when compared with those of saline-treated and non-operated animals. The contralateral side of the cervical segments in KA-treated rats remained unchanged. Some improvement at the motor and sensory tests was observed in animals injected with 0.75 and 1mM KA. Moreover, a mild increase in the neuronal count of the damaged segments was also recorded. The improvement recorded in the motor and sensory tests by day 7 pi may be a consequence of a neuron repairing mechanism triggered soon after the KA excitotoxic effect.
Collapse
Affiliation(s)
- Fabián Nishida
- Image Analysis Laboratory, School of Veterinary Sciences, National University of La Plata (UNLP), Buenos Aires, Argentina; National Research Council of Science and Technology (CONICET), Argentina.
| | - Carolina N Zanuzzi
- Image Analysis Laboratory, School of Veterinary Sciences, National University of La Plata (UNLP), Buenos Aires, Argentina; Department of Histology and Embryology, School of Veterinary Sciences, National University of La Plata, Buenos Aires, Argentina; National Research Council of Science and Technology (CONICET), Argentina.
| | - Agustín Martínez
- National Institute of Agricultural Technology (INTA), Bariloche, Argentina.
| | - Claudio G Barbeito
- Image Analysis Laboratory, School of Veterinary Sciences, National University of La Plata (UNLP), Buenos Aires, Argentina; Department of Histology and Embryology, School of Veterinary Sciences, National University of La Plata, Buenos Aires, Argentina; National Research Council of Science and Technology (CONICET), Argentina.
| | - Enrique L Portiansky
- Image Analysis Laboratory, School of Veterinary Sciences, National University of La Plata (UNLP), Buenos Aires, Argentina; National Research Council of Science and Technology (CONICET), Argentina.
| |
Collapse
|
29
|
Abstract
Because there is no curative treatment for spinal cord injury, establishing an ideal animal model is important to identify injury mechanisms and develop therapies for individuals suffering from spinal cord injuries. In this article, we systematically review and analyze various kinds of animal models of spinal cord injury and assess their advantages and disadvantages for further studies.
Collapse
Affiliation(s)
- Ning Zhang
- Department of Medical Sciences, Jinhua Polytechnic, Jinhua, Zhejiang Province, China
| | - Marong Fang
- Institute of Neuroscience, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, China
| | - Haohao Chen
- Department of Medical Sciences, Jinhua Polytechnic, Jinhua, Zhejiang Province, China
| | - Fangming Gou
- Department of Medical Sciences, Jinhua Polytechnic, Jinhua, Zhejiang Province, China
| | - Mingxing Ding
- Department of Medical Sciences, Jinhua Polytechnic, Jinhua, Zhejiang Province, China ; Institute of Neuroscience, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, China
| |
Collapse
|
30
|
Fenrich KK, May Z, Hurd C, Boychuk CE, Kowalczewski J, Bennett DJ, Whishaw IQ, Fouad K. Improved single pellet grasping using automated ad libitum full-time training robot. Behav Brain Res 2014; 281:137-48. [PMID: 25523027 DOI: 10.1016/j.bbr.2014.11.048] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 11/14/2014] [Accepted: 11/20/2014] [Indexed: 12/15/2022]
Abstract
The single pellet grasping (SPG) task is a skilled forelimb motor task commonly used to evaluate reaching and grasp kinematics and recovery of forelimb function in rodent models of CNS injuries and diseases. To train rats in the SPG task, the animals are usually food restricted then placed in an SPG task enclosure and presented food pellets on a platform located beyond a slit located at the front of the task enclosure for 10-30 min, normally every weekday for several weeks. When the SPG task is applied in studies involving various experimental groups, training quickly becomes labor intensive, and can yield results with significant day-to-day variability. Furthermore, training is frequently done during the animals' light-cycle, which for nocturnal rodents such as mice and rats could affect performance. Here we describe an automated pellet presentation (APP) robotic system to train and test rats in the SPG task that reduces some of the procedural weaknesses of manual training. We found that APP trained rats performed significantly more trials per 24 h period, and had higher success rates with less daily and weekly variability than manually trained rats. Moreover, the results show that success rates are positively correlated with the number of dark-cycle trials, suggesting that dark-cycle training has a positive effect on success rates. These results demonstrate that automated training is an effective method for evaluating and training skilled reaching performance of rats, opening up the possibility for new approaches to investigating the role of motor systems in enabling skilled forelimb use and new approaches to investigating rehabilitation following CNS injury.
Collapse
Affiliation(s)
- Keith K Fenrich
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6E 2G4, Canada; Faculty of Rehabilitation Medicine, University of Alberta, 3-88 Corbett Hall, Edmonton, AB T6E 2G4, Canada.
| | - Zacnicte May
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6E 2G4, Canada; Faculty of Rehabilitation Medicine, University of Alberta, 3-88 Corbett Hall, Edmonton, AB T6E 2G4, Canada
| | - Caitlin Hurd
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6E 2G4, Canada; Faculty of Rehabilitation Medicine, University of Alberta, 3-88 Corbett Hall, Edmonton, AB T6E 2G4, Canada
| | - Carolyn E Boychuk
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6E 2G4, Canada; Faculty of Rehabilitation Medicine, University of Alberta, 3-88 Corbett Hall, Edmonton, AB T6E 2G4, Canada
| | - Jan Kowalczewski
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6E 2G4, Canada
| | - David J Bennett
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6E 2G4, Canada; Faculty of Rehabilitation Medicine, University of Alberta, 3-88 Corbett Hall, Edmonton, AB T6E 2G4, Canada
| | - Ian Q Whishaw
- Canadian Centre for Behavioural Neuroscience, University of Lethbridge, 4401 University Drive West, Lethbridge, AB T1K 3M4, Canada
| | - Karim Fouad
- Neuroscience and Mental Health Institute, University of Alberta, Edmonton, AB T6E 2G4, Canada; Faculty of Rehabilitation Medicine, University of Alberta, 3-88 Corbett Hall, Edmonton, AB T6E 2G4, Canada
| |
Collapse
|
31
|
Peperidou A, Kapoukranidou D, Kontogiorgis C, Hadjipavlou-Litina D. Multitarget molecular hybrids of cinnamic acids. Molecules 2014; 19:20197-226. [PMID: 25474291 PMCID: PMC6271731 DOI: 10.3390/molecules191220197] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 11/14/2014] [Accepted: 11/25/2014] [Indexed: 11/18/2022] Open
Abstract
In an attempt to synthesize potential new multitarget agents, 11 novel hybrids incorporating cinnamic acids and paracetamol, 4-/7-hydroxycoumarin, benzocaine, p-aminophenol and m-aminophenol were synthesized. Three hybrids—2e, 2a, 2g—and 3b were found to be multifunctional agents. The hybrid 2e derived from the phenoxyphenyl cinnamic acid and m-acetamidophenol showed the highest lipoxygenase (LOX) inhibition and analgesic activity (IC50 = 0.34 μM and 98.1%, whereas the hybrid 3b of bromobenzyloxycinnamic acid and hymechromone exhibited simultaneously good LOX inhibitory activity (IC50 = 50 μM) and the highest anti-proteolytic activity (IC50= 5 μM). The hybrid 2a of phenyloxyphenyl acid with paracetamol showed a high analgesic activity (91%) and appears to be a promising agent for treating peripheral nerve injuries. Hybrid 2g which has an ester and an amide bond presents an interesting combination of anti-LOX and anti-proteolytic activity. The esters were found very potent and especially those derived from paracetamol and m-acetamidophenol. The amides follow. Based on 2D-structure–activity relationships it was observed that both steric and electronic parameters play major roles in the activity of these compounds. Molecular docking studies point to the fact that allosteric interactions might govern the LOX-inhibitor binding.
Collapse
Affiliation(s)
- Aikaterini Peperidou
- Department of Pharmaceutical Chemistry, School of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
| | - Dorothea Kapoukranidou
- Department of Physiology, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
| | - Christos Kontogiorgis
- Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace, Dragana (Campus), Alexandroupolis 68100, Greece.
| | - Dimitra Hadjipavlou-Litina
- Department of Pharmaceutical Chemistry, School of Pharmacy, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
| |
Collapse
|
32
|
Desclaux M, Perrin FE, Do-Thi A, Prieto-Cappellini M, Gimenez Y Ribotta M, Mallet J, Privat A. Lentiviral-mediated silencing of glial fibrillary acidic protein and vimentin promotes anatomical plasticity and functional recovery after spinal cord injury. J Neurosci Res 2014; 93:43-55. [PMID: 25131829 DOI: 10.1002/jnr.23468] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 07/12/2014] [Accepted: 07/15/2014] [Indexed: 12/24/2022]
Abstract
In spinal cord injury (SCI), absence of functional recovery and lack of spontaneous axonal regeneration are attributed, among other factors, to the formation of a glial scar that forms both physical and chemical barriers. The glial scar is composed mainly of reactive astrocytes that overexpress two intermediate filament proteins, glial fibrillary acidic protein (GFAP) and vimentin (VIM). To promote regeneration and sprouting of spared axons after spinal cord trauma and with the objective of translation to clinics, we designed an original in vivo gene transfer strategy to reduce glial scar formation after SCI, based on the RNA interference (RNAi)-mediated inhibition of GFAP and VIM. We first show that direct injection of lentiviral vectors expressing short hairpin RNA (shRNA) against GFAP and VIM in a mouse model of SCI allows efficient and specific targeting of astrocytes. We then demonstrate that the lentiviral-mediated and stable expression of shGFAP and shVIM leads to a strong reduction of astrogliosis, improves functional motor recovery, and promotes axonal regrowth and sprouting of spared axons. This study thus examplifies how the nonneuronal environment might be a major target within the lesioned central nervous system to promote axonal regeneration (and sprouting) and validates the use of lentiviral-mediated RNAi in SCI.
Collapse
Affiliation(s)
- Mathieu Desclaux
- Biotechnology and Biotherapy, Centre de Recherche de l'Institut du Cerveau et de la Moelle Epiniere, Centre National de la Recherche Scientifique (CNRS) UMR 7225, Institut National de la Santé et de la Recherche Médicale (INSERM) UMRS 975, Université Pierre et Marie Curie (UPMC), Hôpital de la Pitié Salpêtrière, Paris, France; Columbia University, Department of Pathology and Cell Biology Project A.L.S.-Jenifer Estess Laboratory for Stem Cell Research, New York, New York
| | | | | | | | | | | | | |
Collapse
|
33
|
Hou J, Nelson R, Nissim N, Parmer R, Thompson FJ, Bose P. Effect of combined treadmill training and magnetic stimulation on spasticity and gait impairments after cervical spinal cord injury. J Neurotrauma 2014; 31:1088-106. [PMID: 24552465 DOI: 10.1089/neu.2013.3096] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Spasticity and gait impairments are two common disabilities after cervical spinal cord injury (C-SCI). In this study, we tested the therapeutic effects of early treadmill locomotor training (Tm) initiated at postoperative (PO) day 8 and continued for 6 weeks with injury site transcranial magnetic stimulation (TMSsc) on spasticity and gait impairments after low C6/7 moderate contusion C-SCI in a rat model. The combined treatment group (Tm+TMSsc) showed the most robust decreases in velocity-dependent ankle torques and triceps surae electromyography burst amplitudes that were time locked to the initial phase of lengthening, as well as the most improvement in limb coordination quantitated using three-dimensional kinematics and CatWalk gait analyses, compared to the control or single-treatment groups. These significant treatment-associated decreases in measures of spasticity and gait impairment were also accompanied by marked treatment-associated up-regulation of dopamine beta-hydroxylase, glutamic acid decarboxylase 67, gamma-aminobutyric acid B receptor, and brain-derived neurotrophic factor in the lumbar spinal cord (SC) segments of the treatment groups, compared to tissues from the C-SCI nontreated animals. We propose that the treatment-induced up-regulation of these systems enhanced the adaptive plasticity in the SC, in part through enhanced expression of pre- and postsynaptic reflex regulatory processes. Further, we propose that locomotor exercise in the setting of C-SCI may decrease aspects of the spontaneous maladaptive segmental and descending plasticity. Accordingly, TMSsc treatment is characterized as an adjuvant stimulation that may further enhance this capacity. These data are the first to suggest that a combination of Tm and TMSsc across the injury site can be an effective treatment modality for C-SCI-induced spasticity and gait impairments and provided a pre-clinical demonstration for feasibility and efficacy of early TMSsc intervention after C-SCI.
Collapse
Affiliation(s)
- Jiamei Hou
- 1 Department of Physiological Sciences, University of Florida , Gainesville, Florida
| | | | | | | | | | | |
Collapse
|
34
|
Olby NJ, Lim JH, Babb K, Bach K, Domaracki C, Williams K, Griffith E, Harris T, Muguet-Chanoit A. Gait scoring in dogs with thoracolumbar spinal cord injuries when walking on a treadmill. BMC Vet Res 2014; 10:58. [PMID: 24597771 PMCID: PMC3996037 DOI: 10.1186/1746-6148-10-58] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 02/15/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND An inexpensive method of generating continuous data on hind limb function in dogs with spinal cord injury is needed to facilitate multicentre clinical trials. This study aimed to define normal fore limb, hind limb coordination in dogs walking on a treadmill and then to determine whether reliable data could be generated on the frequency of hind limb stepping and the frequency of coordinated stepping in dogs with a wide range of severities of thoracolumbar spinal cord injury. RESULTS Sixty-nine neurologically normal dogs of different body sizes including seven lame dogs were videotaped walking on the treadmill without prior training and all used the lateral gait of right fore, left hind, left fore, right hind (RF-LH-LF-RH). Severely paraparetic dogs were able to walk on the treadmill for a minimum of 75 seconds, scoring of which generated data representative of function in animals with extremely variable gaits. Fifty consecutive stepping cycles were scored by three observers in 18 dogs with a wide range of disability due to acute thoracolumbar spinal cord injury using a stepping score (hind limb steps/fore limb steps ×100), and a coordination score (coordinated hind limb steps/total hind limb steps ×100). Dogs were also scored using a previously validated ordinal open field score (OFS). Inter- and intraobserver agreement was high as assessed with Cronbach's alpha test for internal reliability. The stepping and coordination scores were significantly correlated to each other and to the OFS. CONCLUSIONS Dogs with naturally occurring spinal cord injury can walk on a treadmill without prior training and their hind limb function can be scored reliably using a stepping score and coordination score. The only requirements for data acquisition are a treadmill and appropriately positioned video camera and so the system can be used in multicentre clinical trials to generate continuous data on neurologic recovery in dogs.
Collapse
Affiliation(s)
- Natasha J Olby
- College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Abstract
Animal models are important to develop therapies for individuals suffering from spinal cord injuries. For this purpose, rats are commonly preferred. In sharp injury models, spinal cord is completely or incompletely cut to assess axonal regeneration. On the other hand, spinal cord is compressed or contused to mimic the human injury in blunt injury models for understanding as well as managing the secondary pathophysiologic processes following injury. Especially, contusions are thought to be biomechanically similar to vertebral fractures and/or dislocations and thus provide the most realistic experimental setting in which to test potential neuroprotective and regenerative strategies.
Collapse
|
36
|
Li S, Shi Z, Zhang H, Liu X, Chen S, Jin J, Wang Y, Jia W, Li H. Assessing gait impairment after permanent middle cerebral artery occlusion in rats using an automated computer-aided control system. Behav Brain Res 2013; 250:174-91. [DOI: 10.1016/j.bbr.2013.04.044] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Revised: 04/20/2013] [Accepted: 04/25/2013] [Indexed: 10/26/2022]
|
37
|
|
38
|
Ricci-Vitiani L, Casalbore P, Petrucci G, Lauretti L, Montano N, Larocca LM, Falchetti ML, Lombardi DG, Gerevini VDG, Cenciarelli C, D'Alessandris QG, Fernandez E, De Maria R, Maira G, Peschle C, Parati E, Pallini R. Influence of local environment on the differentiation of neural stem cells engrafted onto the injured spinal cord. Neurol Res 2013; 28:488-92. [PMID: 16808877 DOI: 10.1179/016164106x115134] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [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: 10/31/2022]
Abstract
OBJECTIVES In vitro, neural stem cells (NSCs) proliferate as undifferentiated spheroids and differentiate into neurons, astrocytes and oligodendrocytes. These features make NSCs suitable for spinal cord (SC) reconstruction. However, in vivo experiments have demonstrated that in the injured SC transplanted NSCs either remain undifferentiated or differentiate into the astrocytic phenotype. The microenvironment of the injured SC is believed to play a crucial role in driving the differentiation of the engrafted NSCs. Here, we tested the hypothesis that inflammatory cytokines (ICs) may be involved in the restricted differentiation of NSCs after grafting onto the injured SC. METHODS As the first step, we used immunohistochemistry to analyse the expression of tumor necrosis factor (TNF)-alpha, interleukin (IL)-1beta and interferon (IFN)-gamma in the normal SC of mice and following traumatic injury. Then, we investigated whether a combination of TNF-alpha, IL-1beta and IFN-gamma may affect the phenotype of murine NSCs in vitro. RESULTS We found that TNF-alpha, IL-1beta and IFN-gamma, which are absent in the normal SC, are all expressed in the injured SC and the expression of these cytokines follows a timely tuned fashion with IFN-gamma being detectable as long as 4 weeks after injury. In culture, exposure of proliferating NSCs to a combination of TNF-alpha, IL-1beta and IFN-gamma was per se sufficient to induce the astrocytic differentiation of these cells even in the absence of serum. CONCLUSIONS In the traumatically injured SC, differentiation of engrafted NSCs is restricted towards the astrocytic lineage because of the inflammatory environment. ICs are likely to play a major role in differentiation of NSCs in the in vivo conditions.
Collapse
Affiliation(s)
- Lucia Ricci-Vitiani
- Department of Hematology, Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Liu Z, Chopp M, Ding X, Cui Y, Li Y. Axonal remodeling of the corticospinal tract in the spinal cord contributes to voluntary motor recovery after stroke in adult mice. Stroke 2013; 44:1951-6. [PMID: 23696550 DOI: 10.1161/strokeaha.113.001162] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE We sought to demonstrate the contribution of axonal remodeling of the corticospinal tract (CST) in the spinal cord to functional outcome after stroke. METHODS Bilateral pyramidotomy (BPT) or sham-BPT was performed in mice with transgenic yellow fluorescent protein labeling in the CST subjected to middle cerebral artery occlusion (MCAo). Foot-fault and single pellet reaching tests were performed 3 days after MCAo and weekly thereafter. Mice were euthanized at day 14 or 28 after stroke. Immunofluorescent staining for growth-associated protein-43 and Synaptophysin was performed on cervical sections. RESULTS Functional improvements were evident during the initial 14 days in both MCAo-sham-BPT and MCAo-BPT mice (P<0.01, versus day 3). Progressive recovery was present during the subsequent 14 days in MCAo-sham-BPT mice (P<0.001, versus day 14) but not in MCAo-BPT mice. In the stroke-affected cervical gray matter of MCAo-sham-BPT mice, growth-associated protein-43-Cy3 staining on CST axons were significantly increased at day 14 after stroke compared with normal mice (P<0.001), and CST axonal density and Synaptophysin-Cy3 staining of CST-yellow fluorescent protein axonal terminals were significantly increased at day 28 compared with day 14 after MCAo (P<0.001). CONCLUSIONS Our data demonstrate that voluntary motor recovery is associated with CST axonal outgrowth and synaptic formation in the denervated side of the spinal gray matter during the later phase after stroke, suggesting that the CST axonal plasticity in the spinal cord contributes to neurological recovery.
Collapse
Affiliation(s)
- Zhongwu Liu
- Department of Neurology, Henry Ford Hospital, Detroit, MI 48202, USA
| | | | | | | | | |
Collapse
|
40
|
Schiaveto-de-Souza A, da-Silva CA, Defino HLA, Del Bel EA. Effect of melatonin on the functional recovery from experimental traumatic compression of the spinal cord. Braz J Med Biol Res 2013; 46:348-58. [PMID: 23579633 PMCID: PMC3854406 DOI: 10.1590/1414-431x20132322] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Accepted: 01/21/2013] [Indexed: 01/27/2024] Open
Abstract
Spinal cord injury is an extremely severe condition with no available effective therapies. We examined the effect of melatonin on traumatic compression of the spinal cord. Sixty male adult Wistar rats were divided into three groups: sham-operated animals and animals with 35 and 50% spinal cord compression with a polycarbonate rod spacer. Each group was divided into two subgroups, each receiving an injection of vehicle or melatonin (2.5 mg/kg, intraperitoneal) 5 min prior to and 1, 2, 3, and 4 h after injury. Functional recovery was monitored weekly by the open-field test, the Basso, Beattie and Bresnahan locomotor scale and the inclined plane test. Histological changes of the spinal cord were examined 35 days after injury. Motor scores were progressively lower as spacer size increased according to the motor scale and inclined plane test evaluation at all times of assessment. The results of the two tests were correlated. The open-field test presented similar results with a less pronounced difference between the 35 and 50% compression groups. The injured groups presented functional recovery that was more evident in the first and second weeks. Animals receiving melatonin treatment presented more pronounced functional recovery than vehicle-treated animals as measured by the motor scale or inclined plane. NADPH-d histochemistry revealed integrity of the spinal cord thoracic segment in sham-operated animals and confirmed the severity of the lesion after spinal cord narrowing. The results obtained after experimental compression of the spinal cord support the hypothesis that melatonin may be considered for use in clinical practice because of its protective effect on the secondary wave of neuronal death following the primary wave after spinal cord injury.
Collapse
Affiliation(s)
- A Schiaveto-de-Souza
- Departamento de Morfofisiologia, Universidade Federal do Mato Grosso do Sul, Campo Grande, MS, Brasil
| | | | | | | |
Collapse
|
41
|
Costa LM, Pereira JE, Filipe VM, Magalhães LG, Couto PA, Gonzalo-Orden JM, Raimondo S, Geuna S, Maurício AC, Nikulina E, Filbin MT, Varejão AS. Rolipram promotes functional recovery after contusive thoracic spinal cord injury in rats. Behav Brain Res 2013; 243:66-73. [DOI: 10.1016/j.bbr.2012.12.056] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2012] [Revised: 12/24/2012] [Accepted: 12/29/2012] [Indexed: 01/28/2023]
|
42
|
Rangasamy SB. Locomotor recovery after spinal cord hemisection/contusion injures in bonnet monkeys: footprint testing--a minireview. Synapse 2013; 67:427-53. [PMID: 23401170 DOI: 10.1002/syn.21645] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Accepted: 02/01/2013] [Indexed: 12/12/2022]
Abstract
Spinal cord injuries usually produce loss or impairment of sensory, motor and reflex function below the level of damage. In the absence of functional regeneration or manipulations that promote regeneration, spontaneous improvements in motor functions occur due to the activation of multiple compensatory mechanisms in animals and humans following the partial spinal cord injury. Many studies were performed on quantitative evaluation of locomotor recovery after induced spinal cord injury in animals using behavioral tests and scoring techniques. Although few studies on rodents have led to clinical trials, it would appear imperative to use nonhuman primates such as macaque monkeys in order to relate the research outcomes to recovery of functions in humans. In this review, we will discuss some of our research evidences concerning the degree of spontaneous recovery in bipedal locomotor functions of bonnet monkeys that underwent spinal cord hemisection/contusion lesions. To our knowledge, this is the first report to discuss on the extent of spontaneous recovery in bipedal locomotion of macaque monkeys through the application of footprint analyzing technique. In addition, the results obtained were compared with the published data on recovery of quadrupedal locomotion of spinally injured rodents. We propose that the mechanisms underlying spontaneous recovery of functions in spinal cord lesioned monkeys may be correlated to the mature function of spinal pattern generator for locomotion under the impact of residual descending and afferent connections. Moreover, based on analysis of motor functions observed in locomotion in these subjected monkeys, we understand that spinal automatism and development of responses by afferent stimuli from outside the cord could possibly contribute to recovery of paralyzed hindlimbs. This report also emphasizes the functional contribution of progressive strengthening of undamaged nerve fibers through a collateral sprouts/synaptic plasticity formed in partially lesioned cord of monkeys.
Collapse
Affiliation(s)
- Suresh Babu Rangasamy
- Department of Neurological Sciences, Rush University Medical Center, Chicago, Illinois, 60612, USA.
| |
Collapse
|
43
|
Abstract
Over the past 2 decades, the biological understanding of the mechanisms underlying structural and functional repair of the injured central nervous system has strongly increased. This has resulted in the development of multiple experimental treatment strategies with the collective aim of enhancing and surpassing the limited spontaneous recovery occurring in animal models and ultimately humans suffering from spinal cord or brain injuries. Several of these experimental treatments have revealed beneficial effects in animal models of spinal cord injury. With the exception of neurorehabilitative therapies, however, therapeutic interventions that enhance recovery are currently absent within the clinical realm of spinal cord injury. The present review surveys the prospects and challenges in experimental and clinical spinal cord repair. Major shortcomings in experimental research center on the difficulty of closely modeling human traumatic spinal cord injury in animals, the small number of investigations done on cervical spinal injury and tetraplegia, and the differences in lesion models, species, and functional outcome parameters used between laboratories. The main challenges in the clinical field of spinal cord repair are associated with the standardization and sensitivity of functional outcome measures, the definition of the inclusion/exclusion criteria for patient recruitment in trials, and the accuracy and reliability of an early diagnosis to predict subsequent neurological outcome. Research and clinical networks were recently created with the goal of optimizing animal studies and human trials. Promising clinical trials are currently in progress. The time has come to translate the biologic-mechanistic knowledge from basic science into efficacious treatments able to improve the conditions of humans suffering from spinal cord injury.
Collapse
Affiliation(s)
- Linard Filli
- Brain Research Institute, University Zurich and Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.
| | | |
Collapse
|
44
|
Górska T, Chojnicka-Gittins B, Majczyński H, Zmysłowski W. Changes in forelimb-hindlimb coordination after partial spinal lesions of different extent in the rat. Behav Brain Res 2013; 239:121-38. [PMID: 23142611 DOI: 10.1016/j.bbr.2012.10.054] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Accepted: 10/15/2012] [Indexed: 11/23/2022]
Abstract
Forelimb-hindlimb coordination in adult rats moving freely along 2m long runway was investigated using the method of footprint recording. Rats were divided into 3 groups with different extent of spinal lesions (T(9)). Before surgery rats moved with a mean locomotor speed of 73±20 to 96±18cms(-1), stride lengths of 17.5±2.0 to 21.2±2.0cm, and trot like coordination. Early after surgery the locomotor speed and the stride lengths were decreased. The forelimb steps were shorter than hindlimb steps, which led to the occurrence of unpaired forelimb steps. Unpaired steps occurred when the hind paw print lay more than half the hindlimb stride length in front of the ipsilateral paw. The number of unpaired steps was negatively correlated with the difference between the fore- and hindlimb step lengths. The recovery of locomotor speed, stride length, and step sequence patterns took up to 3.5 months depending on the extent of lesion. In the last testings the coordination was characterized by increased distances between ipsilateral footprints leading to a change from an almost synchronized trot to a lesion-dependent walk. This change was accompanied by a switch from the use of both patterns A and C to the most frequent use of the Aa pattern that is better adapted to maintain the body balance. All locomotor changes depended on the extent of the injury of lateral and ventral funiculi. These results demonstrate that footprint analysis can be used for the evaluation of forelimb-hindlimb coordination after spinal lesion in rats.
Collapse
|
45
|
Hansen N, Grünewald B, Weishaupt A, Colaço MN, Toyka KV, Sommer C, Geis C. Human Stiff person syndrome IgG-containing high-titer anti-GAD65 autoantibodies induce motor dysfunction in rats. Exp Neurol 2012; 239:202-9. [PMID: 23099416 DOI: 10.1016/j.expneurol.2012.10.013] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 09/11/2012] [Accepted: 10/16/2012] [Indexed: 11/16/2022]
Abstract
Stiff person syndrome (SPS) is an autoimmune CNS disorder characterized by muscle rigidity, spasms and anxiety. The majority of patients have high-titer autoantibodies (ab) against glutamate decarboxylase (GAD65). A pathogenic role of SPS-associated IgG with ab against GAD65 has been shown for anxiety-like behavior but not for the core motor signs. We repetitively injected the purified IgG fraction of an SPS patient with severe motor impairment but without anxious comorbidity containing high titers of anti-GAD65 ab (SPS-IgG) into the lateral ventricle (i.c.v.) or intrathecally (i.th.) at the spinal level in experimental rats. We analyzed the effects on motor and anxiety-like behavior. Non-SPS human IgG fractions served as controls. Animals injected i.c.v. with SPS-IgG showed stiffness-like behavior with impaired walking ability and reduced grip strength of the upper limbs as well as postural and sensorimotor dysfunction. Testing for anxiety-like behavior revealed no significant differences between SPS and control IgG-treated rats. IgG deposits were found only in rats treated with SPS-IgG and were localized predominantly in CNS structures involved in motor control including globus pallidus, internal capsule, striatum and anterior thalamus. Double immunofluorescence staining revealed that predominantly GABAergic interneurons were positive for i.c.v. injected SPS-IgG. Rats injected i.th. with SPS-IgG did not present obvious motor symptoms and had a normal synaptic transmission at the spinal level. We conclude that SPS-like motor dysfunction can be induced in rats by passive transfer of IgG from an SPS-patient with high titer of anti-GAD65 ab. GABAergic dysfunction in supraspinal motor pathways rather than in the spinal cord may lead to motor deficits observed in the rats contrasting observations made in SPS with amphiphysin antibodies.
Collapse
Affiliation(s)
- Niels Hansen
- Department of Neurology, University of Würzburg, Josef-Schneider Strasse 11, 97080 Würzburg, Germany
| | | | | | | | | | | | | |
Collapse
|
46
|
Bose PK, Hou J, Parmer R, Reier PJ, Thompson FJ. Altered patterns of reflex excitability, balance, and locomotion following spinal cord injury and locomotor training. Front Physiol 2012; 3:258. [PMID: 22934014 PMCID: PMC3429034 DOI: 10.3389/fphys.2012.00258] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Accepted: 06/20/2012] [Indexed: 11/13/2022] Open
Abstract
Spasticity is an important problem that complicates daily living in many individuals with spinal cord injury (SCI). While previous studies in human and animals revealed significant improvements in locomotor ability with treadmill locomotor training, it is not known to what extent locomotor training influences spasticity. In addition, it would be of considerable practical interest to know how the more ergonomically feasible cycle training compares with treadmill training as therapy to manage SCI-induced spasticity and to improve locomotor function. Thus the main objective of our present studies was to evaluate the influence of different types of locomotor training on measures of limb spasticity, gait, and reflex components that contribute to locomotion. For these studies, 30 animals received midthoracic SCI using the standard Multicenter Animal Spinal cord Injury Studies (MASCIS) protocol (10 g 2.5 cm weight drop). They were divided randomly into three equal groups: control (contused untrained), contused treadmill trained, and contused cycle trained. Treadmill and cycle training were started on post-injury day 8. Velocity-dependent ankle torque was tested across a wide range of velocities (612-49°/s) to permit quantitation of tonic (low velocity) and dynamic (high velocity) contributions to lower limb spasticity. By post-injury weeks 4 and 6, the untrained group revealed significant velocity-dependent ankle extensor spasticity, compared to pre-surgical control values. At these post-injury time points, spasticity was not observed in either of the two training groups. Instead, a significantly milder form of velocity-dependent spasticity was detected at postcontusion weeks 8-12 in both treadmill and bicycle training groups at the four fastest ankle rotation velocities (350-612°/s). Locomotor training using treadmill or bicycle also produced significant increase in the rate of recovery of limb placement measures (limb axis, base of support, and open field locomotor ability) and reflex rate-depression, a quantitative assessment of neurophysiological processes that regulate segmental reflex excitability, compared with those of untrained injured controls. Light microscopic qualitative studies of spared tissue revealed better preservation of myelin, axons, and collagen morphology in both locomotor trained animals. Both locomotor trained groups revealed decreased lesion volume (rostro-caudal extension) and more spared tissue at the lesion site. These improvements were accompanied by marked upregulation of BDNF, GABA/GABA(b), and monoamines (e.g., norepinephrine and serotonin) which might account for these improved functions. These data are the first to indicate that the therapeutic efficacy of ergonomically practical cycle training is equal to that of the more labor-intensive treadmill training in reducing spasticity and improving locomotion following SCI in an animal model.
Collapse
Affiliation(s)
- Prodip K Bose
- Brain Rehabilitation Research Center, North Florida/South Georgia VA Medical Center Gainesville, FL, USA
| | | | | | | | | |
Collapse
|
47
|
Zurita M, Aguayo C, Bonilla C, Otero L, Rico M, Rodríguez A, Vaquero J. The pig model of chronic paraplegia: A challenge for experimental studies in spinal cord injury. Prog Neurobiol 2012; 97:288-303. [DOI: 10.1016/j.pneurobio.2012.04.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 01/22/2012] [Accepted: 04/17/2012] [Indexed: 12/27/2022]
|
48
|
Jayaraman A, Liu M, Ye F, Walter GA, Vandenborne K. Regenerative responses in slow- and fast-twitch muscles following moderate contusion spinal cord injury and locomotor training. Eur J Appl Physiol 2012; 113:191-200. [DOI: 10.1007/s00421-012-2429-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 05/15/2012] [Indexed: 11/30/2022]
|
49
|
Semler J, Wellmann K, Wirth F, Stein G, Angelova S, Ashrafi M, Schempf G, Ankerne J, Ozsoy O, Ozsoy U, Schönau E, Angelov DN, Irintchev A. Objective measures of motor dysfunction after compression spinal cord injury in adult rats: correlations with locomotor rating scores. J Neurotrauma 2012; 28:1247-58. [PMID: 21428717 DOI: 10.1089/neu.2010.1737] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Precise assessment of motor deficits after traumatic spinal cord injury (SCI) in rodents is crucial for understanding the mechanisms of functional recovery and testing therapeutic approaches. Here we analyzed the applicability to a rat SCI model of an objective approach, the single-frame motion analysis, created and used for functional analysis in mice. Adult female Wistar rats were subjected to graded compression of the spinal cord. Recovery of locomotion was analyzed using video recordings of beam walking and inclined ladder climbing. Three out of four parameters used in mice appeared suitable: the foot-stepping angle (FSA) and the rump-height index (RHI), measured during beam walking, and for estimating paw placement and body weight support, respectively, and the number of correct ladder steps (CLS), assessing skilled limb movements. These parameters, similar to the Basso, Beattie, and Bresnahan (BBB) locomotor rating scores, correlated with lesion volume and showed significant differences between moderately and severely injured rats at 1-9 weeks after SCI. The beam parameters, but not CLS, correlated well with the BBB scores within ranges of poor and good locomotor abilities. FSA co-varied with RHI only in the severely impaired rats, while RHI and CLS were barely correlated. Our findings suggest that the numerical parameters estimate, as intended by design, predominantly different aspects of locomotion. The use of these objective measures combined with BBB rating provides a time- and cost-efficient opportunity for versatile and reliable functional evaluations in both severely and moderately impaired rats, combining clinical assessment with precise numerical measures.
Collapse
Affiliation(s)
- Joerg Semler
- Children's Hospital, University of Cologne, Cologne, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Fernández-Martos CM, González P, Rodriguez FJ. Acute leptin treatment enhances functional recovery after spinal cord injury. PLoS One 2012; 7:e35594. [PMID: 22536415 PMCID: PMC3334982 DOI: 10.1371/journal.pone.0035594] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Accepted: 03/19/2012] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Spinal cord injury is a major cause of long-term disability and has no current clinically accepted treatment. Leptin, an adipocyte-derived hormone, is best known as a regulator of food intake and energy expenditure. Interestingly, several studies have demonstrated that leptin has significant effects on proliferation and cell survival in different neuropathologies. Here, we sought to evaluate the role of leptin after spinal cord injury. FINDINGS Based on its proposed neuroprotective role, we have evaluated the effects of a single, acute intraparenchymal injection of leptin in a clinically relevant animal model of spinal cord injury. As determined by quantitative Real Time-PCR, endogenous leptin and the long isoform of the leptin receptor genes show time-dependent variations in their expression in the healthy and injured adult spinal cord. Immunohistochemical analysis of post-injury tissue showed the long isoform of the leptin receptor expression in oligodendrocytes and, to a lesser extent, in astrocytes, microglia/macrophages and neurons. Moreover, leptin administered after spinal cord injury increased the expression of neuroprotective genes, reduced caspase-3 activity and decreased the expression of pro-inflammatory molecules. In addition, histological analysis performed at the completion of the study showed that leptin treatment reduced microglial reactivity and increased caudal myelin preservation, but it did not modulate astroglial reactivity. Consequently, leptin improved the recovery of sensory and locomotor functioning. CONCLUSIONS Our data suggest that leptin has a prominent neuroprotective and anti-inflammatory role in spinal cord damage and highlights leptin as a promising therapeutic agent.
Collapse
|