51
|
Noristani HN, Boukhaddaoui H, Saint-Martin G, Auzer P, Sidiboulenouar R, Lonjon N, Alibert E, Tricaud N, Goze-Bac C, Coillot C, Perrin FE. A Combination of Ex vivo Diffusion MRI and Multiphoton to Study Microglia/Monocytes Alterations after Spinal Cord Injury. Front Aging Neurosci 2017; 9:230. [PMID: 28769787 PMCID: PMC5515855 DOI: 10.3389/fnagi.2017.00230] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 07/04/2017] [Indexed: 12/11/2022] Open
Abstract
Central nervous system (CNS) injury has been observed to lead to microglia activation and monocytes infiltration at the lesion site. Ex vivo diffusion magnetic resonance imaging (diffusion MRI or DWI) allows detailed examination of CNS tissues, and recent advances in clearing procedures allow detailed imaging of fluorescent-labeled cells at high resolution. No study has yet combined ex vivo diffusion MRI and clearing procedures to establish a possible link between microglia/monocytes response and diffusion coefficient in the context of spinal cord injury (SCI). We carried out ex vivo MRI of the spinal cord at different time-points after spinal cord transection followed by tetrahydrofuran based clearing and examined the density and morphology of microglia/monocytes using two-photon microscopy. Quantitative analysis revealed an early marked increase in microglial/monocytes density that is associated with an increase in the extension of the lesion measured using diffusion MRI. Morphological examination of microglia/monocytes somata at the lesion site revealed a significant increase in their surface area and volume as early as 72 hours post-injury. Time-course analysis showed differential microglial/monocytes response rostral and caudal to the lesion site. Microglia/monocytes showed a decrease in reactivity over time caudal to the lesion site, but an increase was observed rostrally. Direct comparison of microglia/monocytes morphology, obtained through multiphoton, and the longitudinal apparent diffusion coefficient (ADC), measured with diffusion MRI, highlighted that axonal integrity does not correlate with the density of microglia/monocytes or their somata morphology. We emphasize that differential microglial/monocytes reactivity rostral and caudal to the lesion site may thus coincide, at least partially, with reported temporal differences in debris clearance. Our study demonstrates that the combination of ex vivo diffusion MRI and two-photon microscopy may be used to follow structural tissue alteration. Lesion extension coincides with microglia/monocytes density; however, a direct relationship between ADC and microglia/monocytes density and morphology was not observed. We highlighted a differential rostro-caudal microglia/monocytes reactivity that may correspond to a temporal difference in debris clearance and axonal integrity. Thus, potential therapeutic strategies targeting microglia/monocytes after SCI may need to be adjusted not only with the time after injury but also relative to the location to the lesion site.
Collapse
Affiliation(s)
- Harun N Noristani
- Institut National de la Santé et de la Recherche Médicale, U1051Montpellier, France.,University of Montpellier, Montpellier; Institut National de la Santé et de la Recherche Médicale, U1198, Montpellier; École Pratique des Hautes ÉtudesParis, France
| | - Hassan Boukhaddaoui
- Institut National de la Santé et de la Recherche Médicale, U1051Montpellier, France
| | - Guillaume Saint-Martin
- University of Montpellier, Montpellier; Institut National de la Santé et de la Recherche Médicale, U1198, Montpellier; École Pratique des Hautes ÉtudesParis, France.,Charles Coulomb Laboratory, UMR 5221 Centre National de la Recherche ScientifiqueMontpellier, France
| | - Pauline Auzer
- Institut National de la Santé et de la Recherche Médicale, U1051Montpellier, France
| | - Rahima Sidiboulenouar
- Charles Coulomb Laboratory, UMR 5221 Centre National de la Recherche ScientifiqueMontpellier, France
| | - Nicolas Lonjon
- University of Montpellier, Montpellier; Institut National de la Santé et de la Recherche Médicale, U1198, Montpellier; École Pratique des Hautes ÉtudesParis, France.,Centre Hospitalier Universitaire de Montpellier (CHRU), Gui de Chauliac HospitalMontpellier, France
| | - Eric Alibert
- Charles Coulomb Laboratory, UMR 5221 Centre National de la Recherche ScientifiqueMontpellier, France
| | - Nicolas Tricaud
- Institut National de la Santé et de la Recherche Médicale, U1051Montpellier, France
| | - Christophe Goze-Bac
- Charles Coulomb Laboratory, UMR 5221 Centre National de la Recherche ScientifiqueMontpellier, France
| | - Christophe Coillot
- Charles Coulomb Laboratory, UMR 5221 Centre National de la Recherche ScientifiqueMontpellier, France
| | - Florence E Perrin
- Institut National de la Santé et de la Recherche Médicale, U1051Montpellier, France.,University of Montpellier, Montpellier; Institut National de la Santé et de la Recherche Médicale, U1198, Montpellier; École Pratique des Hautes ÉtudesParis, France
| |
Collapse
|
52
|
Wang-Leandro A, Siedenburg JS, Hobert MK, Dziallas P, Rohn K, Stein VM, Tipold A. Comparison of Preoperative Quantitative Magnetic Resonance Imaging and Clinical Assessment of Deep Pain Perception as Prognostic Tools for Early Recovery of Motor Function in Paraplegic Dogs with Intervertebral Disk Herniations. J Vet Intern Med 2017; 31:842-848. [PMID: 28440586 PMCID: PMC5435037 DOI: 10.1111/jvim.14715] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 01/25/2017] [Accepted: 03/16/2017] [Indexed: 01/12/2023] Open
Abstract
Background Prognostic tools to predict early postoperative motor function recovery (MFR) after thoracolumbar intervertebral disk herniation (IVDH) in paraplegic dogs represent an opportunity to timely implement novel therapies that could shorten recovery times and diminish permanent neurological dysfunctions. Hypothesis Fractional anisotropy (FA) values obtained using diffusion tensor imaging have a higher prognostic value than a lesion extension ratio in T2‐weighted images (T2W‐LER) and clinical assessment of deep pain perception (DPP) for MFR. Animals Thirty‐five paraplegic dogs with diagnosis of acute or subacute thoracolumbar IVDH. Methods Prospective, descriptive observational study. At admission, absence or presence of DPP, T2W‐LER, and FA values was evaluated. MFR was assessed within 4 weeks after decompressive surgery. Values of T2W‐LER and FA of dogs with and without MFR were compared using t‐tests. All 3 methods were evaluated for their sensitivity and specificity as a prognostic factor. Results No differences were found between groups regarding T2W‐LER. FA values differed statistically when measured caudally of lesion epicenter being higher in dogs without MFR compared to dogs with MFR (P = .023). Logistic regression analysis revealed significance in FA values measured caudally of the lesion epicenter (P = .033, area under the curve = 0.72). Using a cutoff value of FA = 0.660, the technique had a sensitivity of 80% and a specificity of 55%. Evaluation of DPP had a sensitivity of 73.3% and specificity of 75% (P = .007). Conclusions and Clinical Importance Evaluation of DPP showed a similar sensitivity and a better specificity predicting early MFR than quantitative magnetic resonance imaging.
Collapse
Affiliation(s)
- A Wang-Leandro
- Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hannover, Hannover, Germany.,Centre of Systems Neuroscience, Hannover, Germany
| | - J S Siedenburg
- Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hannover, Hannover, Germany
| | - M K Hobert
- Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hannover, Hannover, Germany
| | - P Dziallas
- Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hannover, Hannover, Germany
| | - K Rohn
- Institute of Biometry, Epidemiology, and Information Processing, University of Veterinary Medicine Hannover, Hannover, Germany
| | - V M Stein
- Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hannover, Hannover, Germany
| | - A Tipold
- Department of Small Animal Medicine and Surgery, University of Veterinary Medicine Hannover, Hannover, Germany.,Centre of Systems Neuroscience, Hannover, Germany
| |
Collapse
|
53
|
Cohen Y, Anaby D, Morozov D. Diffusion MRI of the spinal cord: from structural studies to pathology. NMR IN BIOMEDICINE 2017; 30:e3592. [PMID: 27598689 DOI: 10.1002/nbm.3592] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 06/01/2016] [Accepted: 07/05/2016] [Indexed: 05/27/2023]
Abstract
Diffusion MRI is extensively used to study brain microarchitecture and pathologies, and water diffusion appears highly anisotropic in the white matter (WM) of the spinal cord (SC). Despite these facts, the use of diffusion MRI to study the SC, which has increased in recent years, is much less common than that in the brain. In the present review, after a brief outline of early studies of diffusion MRI (DWI) and diffusion tensor MRI (DTI) of the SC, we provide a short survey on DTI and on diffusion MRI methods beyond the tensor that have been used to study SC microstructure and pathologies. After introducing the porous view of WM and describing the q-space approach and q-space diffusion MRI (QSI), we describe other methodologies that can be applied to study the SC. Selected applications of the use of DTI, QSI, and other more advanced diffusion MRI methods to study SC microstructure and pathologies are presented, with some emphasis on the use of less conventional diffusion methodologies. Because of length constraints, we concentrate on structural studies and on a few selected pathologies. Examples of the use of diffusion MRI to study dysmyelination, demyelination as in experimental autoimmune encephalomyelitis and multiple sclerosis, amyotrophic lateral sclerosis, and traumatic SC injury are presented. We conclude with a brief summary and a discussion of challenges and future directions for diffusion MRI of the SC. Copyright © 2016 John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- Yoram Cohen
- The Sackler School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
- The Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Debbie Anaby
- The Sackler School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
| | - Darya Morozov
- The Sackler School of Chemistry, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
| |
Collapse
|
54
|
Diffusion Assessment of Cortical Changes, Induced by Traumatic Spinal Cord Injury. Brain Sci 2017; 7:brainsci7020021. [PMID: 28218643 PMCID: PMC5332964 DOI: 10.3390/brainsci7020021] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 12/14/2016] [Accepted: 02/14/2017] [Indexed: 01/21/2023] Open
Abstract
Promising treatments are being developed to promote functional recovery after spinal cord injury (SCI). Magnetic resonance imaging, specifically Diffusion Tensor Imaging (DTI) has been shown to non-invasively measure both axonal and myelin integrity following traumatic brain and SCI. A novel data-driven model-selection algorithm known as Diffusion Basis Spectrum Imaging (DBSI) has been proposed to more accurately delineate white matter injury. The objective of this study was to investigate whether DTI/DBSI changes that extend to level of the cerebral peduncle and internal capsule following a SCI could be correlated with clinical function. A prospective non-randomized cohort of 23 patients with chronic spinal cord injuries and 17 control subjects underwent cranial diffusion weighted imaging, followed by whole brain DTI and DBSI computations. Region-based analyses were performed on cerebral peduncle and internal capsule. Three subgroups of patients were included in the region-based analysis. Tract-Based Spatial Statistics (TBSS) was also applied to allow whole-brain white matter analysis between controls and all patients. Functional assessments were made using International Standards for Neurological Classification of Spinal Cord Injury (ISNCSCI) as modified by the American Spinal Injury Association (ASIA) Scale. Whole brain white matter analysis using TBSS finds no statistical difference between controls and all patients. Only cervical ASIA A/B patients in cerebral peduncle showed differences from controls in DTI and DBSI results with region-based analysis. Cervical ASIA A/B SCI patients had higher levels of axonal injury and edema/tissue loss as measured by DBSI at the level of the cerebral peduncle. DTI Fractional Anisotropy (FA), Axial Diffusivity (AD) and Radial Diffusivity (RD) was able to detect differences in cervical ASIA A/B patients, but were non-specific to pathologies. Increased water fraction indicated by DBSI non-restricted isotropic diffusion fraction in the cerebral peduncle, explains the simultaneously increased DTI AD and DTI RD values. Our results further demonstrate the utility of DTI to detect disruption in axonal integrity in white matter, yet a clear shortcoming in differentiating true axonal injury from inflammation/tissue loss. Our results suggest a preservation of axonal integrity at the cortical level and has implications for future regenerative clinical trials.
Collapse
|
55
|
Vedantam A, Hou P, Chi TL, Dougherty PM, Hess KR, Viswanathan A. Use of Spinal Cord Diffusion Tensor Imaging to Quantify Neural Ablation and Evaluate Outcome after Percutaneous Cordotomy for Intractable Cancer Pain. Stereotact Funct Neurosurg 2017; 95:34-39. [PMID: 28088799 DOI: 10.1159/000453279] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 11/06/2016] [Indexed: 02/01/2023]
Abstract
BACKGROUND Up to 20% of patients experience only partial pain relief after percutaneous cordotomy for cancer pain. OBJECTIVE To determine whether diffusion tensor imaging (DTI) can quantify neural ablation and help evaluate early postoperative outcomes after cordotomy. METHODS Patients undergoing percutaneous CT-guided cordotomy for intractable cancer pain were prospectively studied. Pre- and postoperative assessment was made using the visual analog scale (VAS) on pain and the pain severity scores of the Brief Pain Inventory Short Form. On postoperative day 1, DTI images of the high cervical spinal cord were obtained. DTI metrics were correlated with the number of ablations as well as early postoperative pain outcomes. RESULTS Seven patients (4 male, mean age 53.8 ± 4.6 years) were studied. Fractional anisotropy of the hemicord was significantly lower on the side of the lesion as compared to the contralateral side (0.54 ± 0.03 vs. 0.63 ± 0.03, p < 0.001). Mean diffusivity correlated with the improvement in the VAS score at 1 week (r = 0.88, 95% CI = 0.34-1.00, p = 0.008), as well as the change in pain severity scores at 1 week (r = 0.99, 95% CI = 0.82-1.00, p < 0.001). CONCLUSION DTI metrics are sensitive to the number of ablations as well as early improvement in pain scores after cordotomy. DTI of the cervical spinal cord is a potential biomarker of neural ablation after percutaneous cordotomy for intractable cancer pain.
Collapse
Affiliation(s)
- Aditya Vedantam
- Department of Neurosurgery, Baylor College of Medicine, The University of Texas M.D. Anderson Cancer Center, Houston, TX, USA
| | | | | | | | | | | |
Collapse
|
56
|
Maki S, Koda M, Saito J, Takahashi S, Inada T, Kamiya K, Ota M, Iijima Y, Masuda Y, Matsumoto K, Kojima M, Takahashi K, Obata T, Yamazaki M, Furuya T. Tract-Specific Diffusion Tensor Imaging Reveals Laterality of Neurological Symptoms in Patients with Cervical Compression Myelopathy. World Neurosurg 2016; 96:184-190. [DOI: 10.1016/j.wneu.2016.08.129] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 08/29/2016] [Accepted: 08/30/2016] [Indexed: 11/24/2022]
|
57
|
Yoon H, Park NW, Ha YM, Kim J, Moon WJ, Eom K. Diffusion tensor imaging of white and grey matter within the spinal cord of normal Beagle dogs: Sub-regional differences of the various diffusion parameters. Vet J 2016; 215:110-7. [DOI: 10.1016/j.tvjl.2016.03.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 03/14/2016] [Accepted: 03/20/2016] [Indexed: 12/16/2022]
|
58
|
Figini M, Scotti A, Marcuzzo S, Bonanno S, Padelli F, Moreno-Manzano V, García-Verdugo JM, Bernasconi P, Mantegazza R, Bruzzone MG, Zucca I. Comparison of Diffusion MRI Acquisition Protocols for the In Vivo Characterization of the Mouse Spinal Cord: Variability Analysis and Application to an Amyotrophic Lateral Sclerosis Model. PLoS One 2016; 11:e0161646. [PMID: 27560686 PMCID: PMC4999133 DOI: 10.1371/journal.pone.0161646] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Accepted: 08/09/2016] [Indexed: 11/18/2022] Open
Abstract
Diffusion-weighted Magnetic Resonance Imaging (dMRI) has relevant applications in the microstructural characterization of the spinal cord, especially in neurodegenerative diseases. Animal models have a pivotal role in the study of such diseases; however, in vivo spinal dMRI of small animals entails additional challenges that require a systematical investigation of acquisition parameters. The purpose of this study is to compare three acquisition protocols and identify the scanning parameters allowing a robust estimation of the main diffusion quantities and a good sensitivity to neurodegeneration in the mouse spinal cord. For all the protocols, the signal-to-noise and contrast-to noise ratios and the mean value and variability of Diffusion Tensor metrics were evaluated in healthy controls. For the estimation of fractional anisotropy less variability was provided by protocols with more diffusion directions, for the estimation of mean, axial and radial diffusivity by protocols with fewer diffusion directions and higher diffusion weighting. Intermediate features (12 directions, b = 1200 s/mm2) provided the overall minimum inter- and intra-subject variability in most cases. In order to test the diagnostic sensitivity of the protocols, 7 G93A-SOD1 mice (model of amyotrophic lateral sclerosis) at 10 and 17 weeks of age were scanned and the derived diffusion parameters compared with those estimated in age-matched healthy animals. The protocols with an intermediate or high number of diffusion directions provided the best differentiation between the two groups at week 17, whereas only few local significant differences were highlighted at week 10. According to our results, a dMRI protocol with an intermediate number of diffusion gradient directions and a relatively high diffusion weighting is optimal for spinal cord imaging. Further work is needed to confirm these results and for a finer tuning of acquisition parameters. Nevertheless, our findings could be important for the optimization of acquisition protocols for preclinical and clinical dMRI studies on the spinal cord.
Collapse
Affiliation(s)
- Matteo Figini
- Scientific Direction, Fondazione IRCCS Istituto Neurologico “Carlo Besta” Milan, Italy
- * E-mail:
| | - Alessandro Scotti
- Scientific Direction, Fondazione IRCCS Istituto Neurologico “Carlo Besta” Milan, Italy
| | - Stefania Marcuzzo
- Neurology IV—Neuroimmunology and Neuromuscular Diseases Unit, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milan, Italy
| | - Silvia Bonanno
- Neurology IV—Neuroimmunology and Neuromuscular Diseases Unit, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milan, Italy
| | - Francesco Padelli
- Scientific Direction, Fondazione IRCCS Istituto Neurologico “Carlo Besta” Milan, Italy
| | - Victoria Moreno-Manzano
- Neuronal and Tissue Regeneration Laboratory, Centro de Investigación Príncipe Felipe, Valencia, Spain
| | | | - Pia Bernasconi
- Neurology IV—Neuroimmunology and Neuromuscular Diseases Unit, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milan, Italy
| | - Renato Mantegazza
- Neurology IV—Neuroimmunology and Neuromuscular Diseases Unit, Fondazione IRCCS Istituto Neurologico “Carlo Besta”, Milan, Italy
| | | | - Ileana Zucca
- Scientific Direction, Fondazione IRCCS Istituto Neurologico “Carlo Besta” Milan, Italy
| |
Collapse
|
59
|
Xiao Z, Tang F, Tang J, Yang H, Zhao Y, Chen B, Han S, Wang N, Li X, Cheng S, Han G, Zhao C, Yang X, Chen Y, Shi Q, Hou S, Zhang S, Dai J. One-year clinical study of NeuroRegen scaffold implantation following scar resection in complete chronic spinal cord injury patients. SCIENCE CHINA-LIFE SCIENCES 2016; 59:647-55. [PMID: 27333785 DOI: 10.1007/s11427-016-5080-z] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 06/06/2016] [Indexed: 01/05/2023]
Abstract
The objective of this clinical study was to assess the safety and feasibility of the collagen scaffold, NeuroRegen scaffold, one year after scar tissue resection and implantation. Scar tissue is a physical and chemical barrier that prevents neural regeneration. However, identification of scar tissue is still a major challenge. In this study, the nerve electrophysiology method was used to distinguish scar tissue from normal neural tissue, and then different lengths of scars ranging from 0.5-4.5 cm were surgically resected in five complete chronic spinal cord injury (SCI) patients. The NeuroRegen scaffold along with autologous bone marrow mononuclear cells (BMMCs), which have been proven to promote neural regeneration and SCI recovery in animal models, were transplanted into the gap in the spinal cord following scar tissue resection. No obvious adverse effects related to scar resection or NeuroRegen scaffold transplantation were observed immediately after surgery or at the 12-month follow-up. In addition, patients showed partially autonomic nervous function improvement, and the recovery of somatosensory evoked potentials (SSEP) from the lower limbs was also detected. The results indicate that scar resection and NeuroRegen scaffold transplantation could be a promising clinical approach to treating SCI.
Collapse
Affiliation(s)
- Zhifeng Xiao
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100190, China
| | - Fengwu Tang
- Neurology and Neurosurgery Hospital, Affiliated Hospital of Logistics University of Chinese People's Armed Police Forces (CAPF), Tianjin, 300162, China
| | - Jiaguang Tang
- Department of Orthopaedics, First Affiliated Hospital of People's Liberation Army (PLA) General Hospital, Beijing, 100048, China
| | - Huilin Yang
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Yannan Zhao
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100190, China
| | - Bing Chen
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100190, China
| | - Sufang Han
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100190, China
| | - Nuo Wang
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100190, China
| | - Xing Li
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100190, China
| | - Shixiang Cheng
- Neurology and Neurosurgery Hospital, Affiliated Hospital of Logistics University of Chinese People's Armed Police Forces (CAPF), Tianjin, 300162, China
| | - Guang Han
- Neurology and Neurosurgery Hospital, Affiliated Hospital of Logistics University of Chinese People's Armed Police Forces (CAPF), Tianjin, 300162, China
| | - Changyu Zhao
- Neurology and Neurosurgery Hospital, Affiliated Hospital of Logistics University of Chinese People's Armed Police Forces (CAPF), Tianjin, 300162, China
| | - Xiaoxiong Yang
- Department of Orthopaedics, First Affiliated Hospital of People's Liberation Army (PLA) General Hospital, Beijing, 100048, China
| | - Yumei Chen
- Department of Nerve Electrophysiology, First Affiliated Hospital of People's Liberation Army (PLA) General Hospital, Beijing, 100190, China
| | - Qin Shi
- Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, 215006, China
| | - Shuxun Hou
- Department of Orthopaedics, First Affiliated Hospital of People's Liberation Army (PLA) General Hospital, Beijing, 100048, China.
| | - Sai Zhang
- Neurology and Neurosurgery Hospital, Affiliated Hospital of Logistics University of Chinese People's Armed Police Forces (CAPF), Tianjin, 300162, China.
| | - Jianwu Dai
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100190, China.
| |
Collapse
|
60
|
Zhang D, Li XH, Zhai X, He XJ. Feasibility of 3.0 T diffusion-weighted nuclear magnetic resonance imaging in the evaluation of functional recovery of rats with complete spinal cord injury. Neural Regen Res 2015; 10:412-8. [PMID: 25878589 PMCID: PMC4396103 DOI: 10.4103/1673-5374.153689] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/18/2014] [Indexed: 12/14/2022] Open
Abstract
Diffusion tensor imaging is a sensitive way to reflect axonal necrosis and degeneration, glial cell regeneration and demyelination following spinal cord injury, and to display microstructure changes in the spinal cord in vivo. Diffusion tensor imaging technology is a sensitive method to diagnose spinal cord injury; fiber tractography visualizes the white matter fibers, and directly displays the structural integrity and resultant damage of the fiber bundle. At present, diffusion tensor imaging is restricted to brain examinations, and is rarely applied in the evaluation of spinal cord injury. This study aimed to explore the fractional anisotropy and apparent diffusion coefficient of diffusion tensor magnetic resonance imaging and the feasibility of diffusion tensor tractography in the evaluation of complete spinal cord injury in rats. The results showed that the average combined scores were obviously decreased after spinal cord transection in rats, and then began to increase over time. The fractional anisotropy scores after spinal cord transection in rats were significantly lower than those in normal rats (P < 0.05); the apparent diffusion coefficient was significantly increased compared with the normal group (P < 0.05). Following spinal cord transection, fractional anisotropy scores were negatively correlated with apparent diffusion coefficient values (r = -0.856, P < 0.01), and positively correlated with the average combined scores (r = 0.943, P < 0.01), while apparent diffusion coefficient values had a negative correlation with the average combined scores (r = -0.949, P < 0.01). Experimental findings suggest that, as a non-invasive examination, diffusion tensor magnetic resonance imaging can provide qualitative and quantitative information about spinal cord injury. The fractional anisotropy score and apparent diffusion coefficient have a good correlation with the average combined scores, which reflect functional recovery after spinal cord injury.
Collapse
Affiliation(s)
- Duo Zhang
- Second Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
| | - Xiao-hui Li
- Department of Radiology, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
| | - Xu Zhai
- Second Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
| | - Xi-jing He
- Second Department of Orthopedics, Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi Province, China
| |
Collapse
|
61
|
Guan X, Fan G, Wu X, Gu G, Gu X, Zhang H, He S. Diffusion tensor imaging studies of cervical spondylotic myelopathy: a systemic review and meta-analysis. PLoS One 2015; 10:e0117707. [PMID: 25671624 PMCID: PMC4363894 DOI: 10.1371/journal.pone.0117707] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 12/30/2014] [Indexed: 11/19/2022] Open
Abstract
A meta-analysis was conducted to assess alterations in measures of diffusion tensor imaging (DTI) in the patients of cervical spondylotic myelopathy (CSM), exploring the potential role of DTI as a diagnosis biomarker. A systematic search of all related studies written in English was conducted using PubMed, Web of Science, EMBASE, CINAHL, and Cochrane comparing CSM patients with healthy controls. Key details for each study regarding participants, imaging techniques, and results were extracted. DTI measurements, such as fractional anisotropy (FA), apparent diffusion coefficient (ADC), and mean diffusivity (MD) were pooled to calculate the effect size (ES) by fixed or random effects meta-analysis. 14 studies involving 479 CSM patients and 278 controls were identified. Meta-analysis of the most compressed levels (MCL) of CSM patients demonstrated that FA was significantly reduced (ES -1.52, 95% CI -1.87 to -1.16, P < 0.001) and ADC was significantly increased (ES 1.09, 95% CI 0.89 to 1.28, P < 0.001). In addition, a notable ES was found for lowered FA at C2-C3 for CSM vs. controls (ES -0.83, 95% CI -1.09 to -0.570, P < 0.001). Meta-regression analysis revealed that male ratio of CSM patients had a significant effect on reduction of FA at MCL (P = 0.03). The meta-analysis of DTI studies of CSM patients clearly demonstrated a significant FA reduction and ADC increase compared with healthy subjects. This result supports the use of DTI parameters in differentiating CSM patients from health subjects. Future researches are required to investigate the diagnosis performance of DTI in cervical spondylotic myelopathy.
Collapse
Affiliation(s)
- Xiaofei Guan
- Department of Orthopedics, Shanghai Tenth People’s
Hospital, Tongji University School of Medicine, Shanghai,
China
| | - Guoxin Fan
- Department of Orthopedics, Shanghai Tenth People’s
Hospital, Tongji University School of Medicine, Shanghai,
China
| | - Xinbo Wu
- Department of Orthopedics, Shanghai Tenth People’s
Hospital, Tongji University School of Medicine, Shanghai,
China
| | - Guangfei Gu
- Department of Orthopedics, Shanghai Tenth People’s
Hospital, Tongji University School of Medicine, Shanghai,
China
| | - Xin Gu
- Department of Orthopedics, Shanghai Tenth People’s
Hospital, Tongji University School of Medicine, Shanghai,
China
| | - Hailong Zhang
- Department of Orthopedics, Shanghai Tenth People’s
Hospital, Tongji University School of Medicine, Shanghai,
China
| | - Shisheng He
- Department of Orthopedics, Shanghai Tenth People’s
Hospital, Tongji University School of Medicine, Shanghai,
China
| |
Collapse
|
62
|
Kelley BJ, Harel NY, Kim CY, Papademetris X, Coman D, Wang X, Hasan O, Kaufman A, Globinsky R, Staib LH, Cafferty WBJ, Hyder F, Strittmatter SM. Diffusion tensor imaging as a predictor of locomotor function after experimental spinal cord injury and recovery. J Neurotrauma 2014; 31:1362-73. [PMID: 24779685 DOI: 10.1089/neu.2013.3238] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Traumatic spinal cord injury (SCI) causes long-term disability with limited functional recovery linked to the extent of axonal connectivity. Quantitative diffusion tensor imaging (DTI) of axonal integrity has been suggested as a potential biomarker for prognostic and therapeutic evaluation after trauma, but its correlation with functional outcomes has not been clearly defined. To examine this application, female Sprague-Dawley rats underwent midthoracic laminectomy followed by traumatic spinal cord contusion of differing severities or laminectomy without contusion. Locomotor scores and hindlimb kinematic data were collected for 4 weeks post-injury. Ex vivo DTI was then performed to assess axonal integrity using tractography and fractional anisotropy (FA), a numerical measure of relative white matter integrity, at the injury epicenter and at specific intervals rostral and caudal to the injury site. Immunohistochemistry for tissue sparing was also performed. Statistical correlation between imaging data and functional performance was assessed as the primary outcome. All injured animals showed some recovery of locomotor function, while hindlimb kinematics revealed graded deficits consistent with injury severity. Standard T2 magnetic resonance sequences illustrated conventional spinal cord morphology adjacent to contusions while corresponding FA maps indicated graded white matter pathology within these adjacent regions. Positive correlations between locomotor (Basso, Beattie, and Bresnahan score and gait kinematics) and imaging (FA values) parameters were also observed within these adjacent regions, most strongly within caudal segments beyond the lesion. Evaluation of axonal injury by DTI provides a mechanism for functional recovery assessment in a rodent SCI model. These findings suggest that focused DTI analysis of caudal spinal cord should be studied in human cases in relationship to motor outcome to augment outcome biomarkers for clinical cases.
Collapse
Affiliation(s)
- Brian J Kelley
- 1 Department of Neurosurgery, Yale University School of Medicine , New Haven, Connecticut
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
63
|
Wang Y, Liu L, Ma L, Huang X, Lou X, Wang Y, Wu N, Liu T, Guo X. Preliminary study on cervical spinal cord in patients with amyotrophic lateral sclerosis using MR diffusion tensor imaging. Acad Radiol 2014; 21:590-6. [PMID: 24703471 DOI: 10.1016/j.acra.2014.01.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 01/22/2014] [Accepted: 01/22/2014] [Indexed: 01/01/2023]
Abstract
RATIONALE AND OBJECTIVES To investigate the conventional magnetic resonance (MR) findings of cervical spinal cord, to explore the possible changes on diffusion tensor imaging (DTI) in patients with amyotrophic lateral sclerosis (ALS), and to assess the correlations between the changes on DTI and clinical parameters in patients with ALS. MATERIALS AND METHODS Conventional MR imaging (MRI) and DTI in 24 patients with ALS and 16 age-matched control subjects were obtained. On axial planes, regions of interest (ROIs) were marked in bilateral spinothalamic tracts (STs), posterior funiculus, and bilateral lateral corticospinal tracts (LCTs), respectively, at the levels of cervical 2-4 vertebral bodies. Fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values of these ROIs were estimated. Independent sample t test and Pearson correlation analysis were used. RESULTS In patients with ALS, no abnormal findings were noted in the cervical spinal cord on conventional MRI. FA values of bilateral LCTs decreased significantly compared to those of the control group (P < .05), and ADC values of bilateral LCTs were significantly greater than those of the control group (P < .05). FA and ADC values of bilateral LCTs showed no significant difference between patients with definite and probable ALS (P > .05). No significant correlation existed between abnormal DTI parameters (FA and ADC values of bilateral LCTs) and clinical parameters (P > .05). CONCLUSIONS Subtle abnormalities in bilateral LCTs in the "normal-appearing" cervical spinal cord can be detected using quantitative DTI technique in patients with ALS.
Collapse
|