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Wu Z, Feng K, Huang J, Ye X, Yang R, Huang Q, Jiang Q. Brain region changes following a spinal cord injury. Neurochem Int 2024; 174:105696. [PMID: 38354751 DOI: 10.1016/j.neuint.2024.105696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 01/16/2024] [Accepted: 02/10/2024] [Indexed: 02/16/2024]
Abstract
Brain-related complications are common in clinical practice after spinal cord injury (SCI); however, the molecular mechanisms of these complications are still unclear. Here, we reviewed the changes in the brain regions caused by SCI from three perspectives: imaging, molecular analysis, and electrophysiology. Imaging studies revealed abnormal functional connectivity, gray matter volume atrophy, and metabolic abnormalities in brain regions after SCI, leading to changes in the structure and function of brain regions. At the molecular level, chemokines, inflammatory factors, and damage-associated molecular patterns produced in the injured area were retrogradely transmitted through the corticospinal tract, cerebrospinal fluid, or blood circulation to the specific brain area to cause pathologic changes. Electrophysiologic recordings also suggested abnormal changes in brain electrical activity after SCI. Transcranial magnetic stimulation, transcranial direct current stimulation, and deep brain stimulation alleviated pain and improved motor function in patients with SCI; therefore, transcranial therapy may be a new strategy for the treatment of patients with SCI.
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Affiliation(s)
- Zhiwu Wu
- Department of Neurosurgery, Ganzhou People's Hospital (Ganzhou Hospital-Nanfang Hospital, Southern Medical University), 16th Mei-guan Avenue, Ganzhou, 341000, China
| | - Kaiming Feng
- Department of Neurosurgery, Ganzhou People's Hospital (Ganzhou Hospital-Nanfang Hospital, Southern Medical University), 16th Mei-guan Avenue, Ganzhou, 341000, China
| | - Jinqing Huang
- Department of Neurosurgery, Ganzhou People's Hospital (Ganzhou Hospital-Nanfang Hospital, Southern Medical University), 16th Mei-guan Avenue, Ganzhou, 341000, China
| | - Xinyun Ye
- Department of Neurosurgery, Ganzhou People's Hospital (Ganzhou Hospital-Nanfang Hospital, Southern Medical University), 16th Mei-guan Avenue, Ganzhou, 341000, China
| | - Ruijin Yang
- Department of Neurosurgery, Ganzhou People's Hospital (Ganzhou Hospital-Nanfang Hospital, Southern Medical University), 16th Mei-guan Avenue, Ganzhou, 341000, China
| | - Qianliang Huang
- Department of Neurosurgery, Ganzhou People's Hospital (Ganzhou Hospital-Nanfang Hospital, Southern Medical University), 16th Mei-guan Avenue, Ganzhou, 341000, China.
| | - Qiuhua Jiang
- Department of Neurosurgery, Ganzhou People's Hospital (Ganzhou Hospital-Nanfang Hospital, Southern Medical University), 16th Mei-guan Avenue, Ganzhou, 341000, China.
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Li J, Shan Y, Zhao X, Shan G, Wei PH, Liu L, Wang C, Wu H, Song W, Tang Y, Zhao GG, Lu J. Structural and functional changes in the brain after chronic complete thoracic spinal cord injury. Brain Res 2024; 1823:148680. [PMID: 37977412 DOI: 10.1016/j.brainres.2023.148680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 11/02/2023] [Accepted: 11/14/2023] [Indexed: 11/19/2023]
Abstract
This study aimed to investigate whether brain anatomical structures and functional network connectivity are altered after chronic complete thoracic spinal cord injury (cctSCI) and to determine how these changes impact clinical outcomes. Structural and resting-state functional MRI was performed for 19 cctSCI patients (18 for final statistics) and 19 healthy controls. Voxel-based morphometry (VBM) was used to assess gray matter volume (GMV) with differences between cctSCI patients and controls. VBM results were used as seeds for whole-brain functional connectivity (FC) analysis. The relationship between brain changes and clinical variables was investigated. Compared with those of the control group, the left triangular inferior frontal gyrus, middle frontal gyrus, orbital inferior frontal gyrus, precuneus and parietal superior gyrus volumes of SCI patients decreased, while the left superior frontal gyrus and supplementary motor area volumes increased. Additionally, when the regions with increased GMV were used as seeds, the FC of the parahippocampus and thalamus increased. Subsequent partial correlation analysis showed a positive correlation between FC and total sensorimotor score based on the ASIA criteria (p = 0.001, r = 0.746). Overall, the structural and functional changes in the brain after cctSCI occurred in some visual and cognitive areas and sensory or motor control areas. These findings aid in improving our understanding of the underlying brain injury mechanisms and the subsequent structural and functional reorganization to reveal potential therapeutic targets and track treatment outcomes.
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Affiliation(s)
- Jing Li
- Department of Radiology and Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing 100053, China; Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing 100053, China
| | - Yi Shan
- Department of Radiology and Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing 100053, China; Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing 100053, China
| | - Xiaojing Zhao
- Department of Radiology and Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing 100053, China; Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing 100053, China
| | - Guixiang Shan
- Department of Rehabilitation, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Peng-Hu Wei
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Lin Liu
- Department of Rehabilitation, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Changming Wang
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Hang Wu
- Department of Medical Engineering, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Weiqun Song
- Department of Rehabilitation, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Yi Tang
- Innovation Center for Neurological Disorders, Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Guo-Guang Zhao
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing 100053, China; Clinical Research Center for Epilepsy Capital Medical University, Beijing 100053, China; Beijing Municipal Geriatric Medical Research Center, Beijing 100053, China.
| | - Jie Lu
- Department of Radiology and Nuclear Medicine, Xuanwu Hospital, Capital Medical University, Beijing 100053, China; Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing 100053, China.
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Hasan MA, Sattar P, Qazi SA, Fraser M, Vuckovic A. Brain Networks With Modified Connectivity in Patients With Neuropathic Pain and Spinal Cord Injury. Clin EEG Neurosci 2024; 55:88-100. [PMID: 34714181 DOI: 10.1177/15500594211051485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Background. Neuropathic pain (NP) following spinal cord injury (SCI) affects the quality of life of almost 40% of the injured population. The modified brain connectivity was reported under different NP conditions. Therefore, brain connectivity was studied in the SCI population with and without NP with the aim to identify networks that are altered due to injury, pain, or both. Methods. The study cohort is classified into 3 groups, SCI patients with NP, SCI patients without NP, and able-bodied. EEG of each participant was recorded during motor imagery (MI) of paralyzed and painful, and nonparalyzed and nonpainful limbs. Phased locked value was calculated using Hilbert transform to study altered functional connectivity between different regions. Results. The posterior region connectivity with frontal, fronto-central, and temporal regions is strongly decreased mainly during MI of dominant upper limb (nonparalyzed and nonpainful limbs) in SCI no pain group. This modified connectivity is prominent in the alpha and high-frequency bands (beta and gamma). Moreover, oscillatory modified global connectivity is observed in the pain group during MI of painful and paralyzed limb which is more evident between fronto-posterior, frontocentral-posterior, and within posterior and within frontal regions in the theta and SMR frequency bands. Cluster coefficient and local efficiency values are reduced in patients with no reported pain group while increased in the PWP group. Conclusion. The altered theta band connectivity found in the fronto-parietal network along with a global increase in local efficiency is a consequence of pain only, while altered connectivity in the beta and gamma bands along with a decrease in cluster coefficient values observed in the sensory-motor network is dominantly a consequence of injury only. The outcomes of this study may be used as a potential diagnostic biomarker for the NP. Further, the expected insight holds great clinical relevance in the design of neurofeedback-based neurorehabilitation and connectivity-based brain-computer interfaces for SCI patients.
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Affiliation(s)
- Muhammad A Hasan
- Department of Biomedical Engineering, NED University of Engineering & Technology, Karachi, Pakistan
| | - Parisa Sattar
- Neurocomputation Laboratory, National Centre for Artificial Intelligence, Karachi, Pakistan
| | - Saad A Qazi
- Neurocomputation Laboratory, National Centre for Artificial Intelligence, Karachi, Pakistan
- Department of Electrical and Computer Engineering, NED University of Engineering & Technology, Karachi, Pakistan
| | - Matthew Fraser
- Queen Elizabeth National Spinal Unit, Southern General Hospital, Glasgow, UK
| | - Aleksandra Vuckovic
- Centre for Rehabilitation Engineering, School of Engineering, University of Glasgow, Glasgow, UK
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Matsubayashi K, Shinozaki M, Hata J, Komaki Y, Nagoshi N, Tsuji O, Fujiyoshi K, Nakamura M, Okano H. A shift of brain network hub after spinal cord injury. Front Mol Neurosci 2023; 16:1245902. [PMID: 37915973 PMCID: PMC10616864 DOI: 10.3389/fnmol.2023.1245902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 09/25/2023] [Indexed: 11/03/2023] Open
Abstract
Background Spinal cord injury (SCI) causes severe sequelae and significant social loss, depending on the extent of the damage. Most previous studies have focused on the pathology of the spinal cord to develop treatments for SCI. However, it is now known that the brain, which is not directly damaged, also undergoes morphological changes after spinal cord injury, which could affect natural recovery and treatment. In recent years, magnetic resonance imaging (MRI) has been developed to analyze functional changes in the brain. Resting-state functional MRI (rsfMRI), which captures brain activity at rest, can calculate functional connections between brain areas and identify central hubs by network analysis. Purpose We aim to investigate functional connectivity in the brain using rsfMRI after SCI and to determine how brain-network main hubs change over time. Methods We evaluated rsfMRI in 10 mice of the contusional SCI model and calculated connectivity using graph theory. We evaluated "centrality," a representative parameter of network analysis. The subtype of centrality was degree centrality, which indicates the hub function of a single area. The five times of rsfMRI were performed in each individual mouse: before injury and at 1, 3, 7, and 14 weeks post-injury. Results Before the injury, the degree centralities of the primary and secondary motor cortex were high, suggesting that these motor cortices served as main hubs for motor function. After SCI, the hub function of the motor cortices decreased by 14 weeks. In contrast, hub function in the external capsule and the putamen comparatively increased with time after injury, suggesting that the extrapyramidal/subcortical system, which runs the ventral side of the spinal cord and remains after injury in this model, becomes dominant. Conclusion We demonstrated the shift of the brain network hub after SCI. The results of this study provide basic information for understanding brain network changes after SCI and would be useful for treatment selection and evaluation of its efficacy in SCI patients.
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Affiliation(s)
- Kohei Matsubayashi
- Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan
| | - Munehisa Shinozaki
- Department of Physiology, School of Medicine, Keio University, Tokyo, Japan
| | - Junichi Hata
- Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Yuji Komaki
- Live Animal Imaging Center, Central Institute for Experimental Animals, Kanagawa, Japan
| | - Narihito Nagoshi
- Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan
| | - Osahiko Tsuji
- Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan
| | - Kanehiro Fujiyoshi
- Department of Orthopaedic Surgery, Murayama Medical Center (NHO), Tokyo, Japan
| | - Masaya Nakamura
- Department of Orthopaedic Surgery, School of Medicine, Keio University, Tokyo, Japan
| | - Hideyuki Okano
- Department of Physiology, School of Medicine, Keio University, Tokyo, Japan
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Feng T, Zhao C, Rao JS, Guo XJ, Bao SS, He LW, Zhao W, Liu Z, Yang ZY, Li XG. Different macaque brain network remodeling after spinal cord injury and NT3 treatment. iScience 2023; 26:106784. [PMID: 37378337 PMCID: PMC10291247 DOI: 10.1016/j.isci.2023.106784] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 03/08/2023] [Accepted: 04/26/2023] [Indexed: 06/29/2023] Open
Abstract
Graph theory-based analysis describes the brain as a complex network. Only a few studies have examined modular composition and functional connectivity (FC) between modules in patients with spinal cord injury (SCI). Little is known about the longitudinal changes in hubs and topological properties at the modular level after SCI and treatment. We analyzed differences in FC and nodal metrics reflecting modular interaction to investigate brain reorganization after SCI-induced compensation and neurotrophin-3 (NT3)-chitosan-induced regeneration. Mean inter-modular FC and participation coefficient of areas related to motor coordination were significantly higher in the treatment animals than in the SCI-only ones at the late stage. The magnocellular part of the red nucleus may reflect the best difference in brain reorganization after SCI and therapy. Treatment can enhance information flows between regions and promote the integration of motor functions to return to normal. These findings may reveal the information processing of disrupted network modules.
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Affiliation(s)
- Ting Feng
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Can Zhao
- Institute of Rehabilitation Engineering, China Rehabilitation Science Institute, Beijing, PR China
| | - Jia-Sheng Rao
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Xiao-Jun Guo
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Shu-Sheng Bao
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Le-Wei He
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Wen Zhao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, PR China
| | - Zuxiang Liu
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, PR China
- Institute of Artificial Intelligence, Hefei Comprehensive National Science Center, Hefei, PR China
- Department of Biology, College of Life Sciences, University of Chinese Academy of Sciences, Beijing, PR China
| | - Zhao-Yang Yang
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, PR China
| | - Xiao-Guang Li
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
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Rao JS, Zhao C, Wei RH, Feng T, Bao SS, Zhao W, Tian Z, Liu Z, Yang ZY, Li XG. Neural regeneration therapy after spinal cord injury induces unique brain functional reorganizations in rhesus monkeys. Ann Med 2022; 54:1867-1883. [PMID: 35792748 PMCID: PMC9272921 DOI: 10.1080/07853890.2022.2089728] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
PURPOSE Spinal cord injury (SCI) destroys the sensorimotor pathway and induces brain plasticity. However, the effect of treatment-induced spinal cord tissue regeneration on brain functional reorganization remains unclear. This study was designed to investigate the large-scale functional interactions in the brains of adult female Rhesus monkeys with injured and regenerated thoracic spinal cord. MATERIALS AND METHODS Resting-state functional magnetic resonance imaging (fMRI) combined with Granger Causality analysis (GCA) and motor behaviour analysis were used to assess the causal interaction between sensorimotor cortices, and calculate the relationship between causal interaction and hindlimb stepping in nine Rhesus monkeys undergoing lesion-induced spontaneous recovery (injured, n = 4) and neurotrophin-3/chitosan transplantation-induced regeneration (NT3-chitosan, n = 5) after SCI. RESULTS The results showed that the injured and NT3-chitosan-treated animals had distinct spatiotemporal features of brain functional reorganization. The spontaneous recovery followed the model of "early intra-hemispheric reorganization dominant, late inter-hemispheric reorganization dominant", whereas regenerative therapy animals showed the opposite trend. Although the variation degree of information flow intensity was consistent, the tendency and the relationship between local neuronal activity properties and coupling strength were different between the two groups. In addition, the injured and NT3-chitosan-treated animals had similar motor adjustments but various relationship modes between motor performance and information flow intensity. CONCLUSIONS Our findings show that brain functional reorganization induced by regeneration therapy differed from spontaneous recovery after SCI. The influence of unique changes in brain plasticity on the therapeutic effects of future regeneration therapy strategies should be considered. Key messagesNeural regeneration elicited a unique spatiotemporal mode of brain functional reorganization in the spinal cord injured monkeys, and that regeneration does not simply reverse the process of brain plasticity induced by spinal cord injury (SCI).Independent "properties of local activity - intensity of information flow" relationships between the injured and treated animals indicating that spontaneous recovery and regenerative therapy exerted different effects on the reorganization of the motor network after SCI.A specific information flow from the left thalamus to the right insular can serve as an indicator to reflect a heterogeneous "information flow - motor performance" relationship between injured and treated animals at similar motor adjustments.
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Affiliation(s)
- Jia-Sheng Rao
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Can Zhao
- Institute of Rehabilitation Engineering, China Rehabilitation Science Institute, Beijing, PR China
| | - Rui-Han Wei
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Ting Feng
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Shu-Sheng Bao
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
| | - Wen Zhao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, PR China
| | - Zhaolong Tian
- Department of Anesthesiology, Xuanwu Hospital Capital Medical University, Beijing, PR China
| | - Zuxiang Liu
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, PR China.,Hefei Comprehensive National Science Center, Institute of Artificial Intelligence, Hefei, PR China.,Department of Biology, College of Life Sciences, University of Chinese Academy of Sciences, Beijing, PR China
| | - Zhao-Yang Yang
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, PR China
| | - Xiao-Guang Li
- School of Biological Science and Medical Engineering, Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, PR China
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Wang L, Zheng W, Yang B, Chen Q, Li X, Chen X, Hu Y, Cao L, Ren J, Qin W, Yang Y, Lu J, Chen N. Altered functional connectivity between primary motor cortex subregions and the whole brain in patients with incomplete cervical spinal cord injury. Front Neurosci 2022; 16:996325. [PMID: 36408378 PMCID: PMC9669417 DOI: 10.3389/fnins.2022.996325] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 10/17/2022] [Indexed: 11/03/2023] Open
Abstract
To investigate the reorganizations of gray matter volume (GMV) in each subregion of primary motor cortex (M1) after incomplete cervical cord injury (ICCI) and to explore the differences in functional connectivity (FC) between the M1 subregions and the whole brain, and further to disclose the potential value of each M1 subregion in motor function rehabilitation of ICCI patients. Eighteen ICCI patients and eighteen age- and gender- matched healthy controls (HCs) were recruited in this study. The 3D high-resolution T1-weighted structural images and resting-state functional magnetic resonance imaging (rs-fMRI) of all subjects were obtained using a 3.0 Tesla MRI system. Based on the Human Brainnetome Atlas, the structural and functional changes of M1 subregions (including A4hf, A6cdl, A4ul, A4t, A4tl, A6cvl) in ICCI patients were analyzed by voxel-based morphometry (VBM) and seed-based FC, respectively. Compared with HCs, no structural changes in the M1 subregions of ICCI patients was detected. However, when compared with HCs, ICCI patients exhibited decreased FC in visual related areas (lingual gyrus, fusiform gyrus) and sensorimotor related areas (primary sensorimotor cortex) when the seeds were located in bilateral A4hf, A4ul, and decreased FC in visual related areas (lingual gyrus, fusiform gyrus) and cognitive related areas (temporal pole) when the seed was located in the left A4t. Moreover, when the seeds were located in the bilateral A6cdl, decreased FC in visual related areas (lingual gyrus, fusiform gyrus, calcarine gyrus) was also observed. Our findings demonstrated that each of the M1 regions had diverse FC reorganizations, which may provide a theoretical basis for the selection of precise stimulation targets, such as transcranial magnetic stimulation (TMS) or transcranial direct current stimulation (tCDS), meanwhile, our results may reveal the possible mechanism of visual feedback and cognitive training to promote motor rehabilitation.
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Affiliation(s)
- Ling Wang
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Weimin Zheng
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Beining Yang
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Qian Chen
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Xuejing Li
- Department of Radiology, China Rehabilitation Research Center, Beijing, China
| | - Xin Chen
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Yongsheng Hu
- Department of Functional Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Lei Cao
- Department of Rehabilitation Medicine, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Jian Ren
- Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Wen Qin
- Department of Radiology, Tianjin Medical University General Hospital, Beijing, China
| | - Yanhui Yang
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Jie Lu
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Nan Chen
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
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Zhang X. Effects of Anesthesia on Cerebral Blood Flow and Functional Connectivity of Nonhuman Primates. Vet Sci 2022; 9:vetsci9100516. [PMID: 36288129 PMCID: PMC9609818 DOI: 10.3390/vetsci9100516] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/14/2022] [Accepted: 09/19/2022] [Indexed: 02/07/2023] Open
Abstract
Nonhuman primates (NHPs) are the closest living relatives of humans and play a critical and unique role in neuroscience research and pharmaceutical development. General anesthesia is usually required in neuroimaging studies of NHPs to keep the animal from stress and motion. However, the adverse effects of anesthesia on cerebral physiology and neural activity are pronounced and can compromise the data collection and interpretation. Functional connectivity is frequently examined using resting-state functional MRI (rsfMRI) to assess the functional abnormality in the animal brain under anesthesia. The fMRI signal can be dramatically suppressed by most anesthetics in a dose-dependent manner. In addition, rsfMRI studies may be further compromised by inter-subject variations when the sample size is small (as seen in most neuroscience studies of NHPs). Therefore, proper use of anesthesia is strongly demanded to ensure steady and consistent physiology maintained during rsfMRI data collection of each subject. The aim of this review is to summarize typical anesthesia used in rsfMRI scans of NHPs and the effects of anesthetics on cerebral physiology and functional connectivity. Moreover, the protocols with optimal rsfMRI data acquisition and anesthesia procedures for functional connectivity study of macaque monkeys are introduced.
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Affiliation(s)
- Xiaodong Zhang
- EPC Imaging Center and Division of Neuropharmacology and Neurologic Diseases, Emory National Primate Research Center, Emory University, 954 Gatewood RD, Atlanta, GA 30329, USA
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9
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Kim AR, Cha H, Kim E, Kim S, Lee HJ, Park E, Lee YS, Jung TD, Chang Y. Impact of fractional amplitude of low-frequency fluctuations in motor- and sensory-related brain networks on spinal cord injury severity. NMR IN BIOMEDICINE 2022; 35:e4612. [PMID: 34505321 DOI: 10.1002/nbm.4612] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 08/18/2021] [Accepted: 08/19/2021] [Indexed: 06/13/2023]
Abstract
Spinal cord injury (SCI) can cause motor, sensory, and autonomic dysfunctions and may affect the cerebral functions. However, the mechanisms of plastic changes in the brain according to SCI severity remain poorly understood. Therefore, in the current study, we compared the brain activity of the entire neural network according to severity of SCI using fractional amplitude of low-frequency fluctuations (fALFF) analysis in resting-state functional magnetic resonance imaging (rs-fMRI). A total of 59 participants were included, consisting of 19 patients with complete SCI, 20 patients with incomplete SCI, and 20 healthy individuals. Their motor and sensory functions were evaluated. The rs-fMRI data of low-frequency fluctuations were analyzed based on fALFF. Differences in fALFF values among complete-SCI patients, incomplete-SCI patients, and healthy controls were assessed using ANOVA. Then post hoc analysis and two-sample t-tests were conducted to assess the differences between the three groups. Pearson correlation analyses were used to determine correlations between clinical measures and the z-score of the fALFF in the SCI groups. Patients with SCI (complete and incomplete) showed lower fALFF values in the superior medial frontal gyrus than the healthy controls, and were associated with poor motor and sensory function (p < .05). Higher fALFF values were observed in the putamen and thalamus, and were negatively associated with motor and sensory function (p < .05). In conclusion, alterations in the neural activity of the motor- and sensory-related networks of the brain were observed in complete-SCI and incomplete-SCI patients. Moreover, plastic changes in these brain regions were associated with motor and sensory function.
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Affiliation(s)
- Ae Ryoung Kim
- Department of Physical Medicine and Rehabilitation, Kyungpook National University School of Medicine, South Korea
- Department of Physical Medicine and Rehabilitation, Kyungpook National University Hospital, South Korea
| | - Hyunsil Cha
- Department of Medical & Biological Engineering, Kyungpook National University, South Korea
| | - Eunji Kim
- Department of Medical & Biological Engineering, Kyungpook National University, South Korea
| | - Seungho Kim
- Department of Medical & Biological Engineering, Kyungpook National University, South Korea
| | - Hui Joong Lee
- Department of Radiology, Kyungpook National University School of Medicine, South Korea
- Department of Radiology, Kyungpook National University Hospital, South Korea
| | - Eunhee Park
- Department of Physical Medicine and Rehabilitation, Kyungpook National University School of Medicine, South Korea
- Department of Physical Medicine and Rehabilitation, Kyungpook National University Hospital, South Korea
| | - Yang-Soo Lee
- Department of Physical Medicine and Rehabilitation, Kyungpook National University School of Medicine, South Korea
- Department of Physical Medicine and Rehabilitation, Kyungpook National University Hospital, South Korea
| | - Tae-Du Jung
- Department of Physical Medicine and Rehabilitation, Kyungpook National University School of Medicine, South Korea
- Department of Physical Medicine and Rehabilitation, Kyungpook National University Hospital, South Korea
| | - Yongmin Chang
- Department of Medical & Biological Engineering, Kyungpook National University, South Korea
- Department of Radiology, Kyungpook National University Hospital, South Korea
- The Department of Molecular Medicine, Kyungpook National University School of Medicine, South Korea
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10
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Rao JS, Zhao C, Bao SS, Feng T, Xu M. MRI metrics at the epicenter of spinal cord injury are correlated with the stepping process in rhesus monkeys. Exp Anim 2021; 71:139-149. [PMID: 34789621 PMCID: PMC9130044 DOI: 10.1538/expanim.21-0154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Clinical evaluations of long-term outcomes in the early-stage spinal cord injury (SCI) focus on macroscopic motor performance and are limited in their prognostic precision. This study was designed to investigate the sensitivity of the magnetic resonance imaging (MRI) indexes to the data-driven gait process after SCI. Ten adult female rhesus monkeys were subjected to thoracic SCI. Kinematics-based gait examinations were performed at 1 (early stage) and 12 (chronic stage) months post-SCI. The proportion of stepping (PS) and gait stability (GS) were calculated as the outcome measures. MRI metrics, which were derived from structural imaging (spinal cord cross-sectional area, SCA) and diffusion tensor imaging (fractional anisotropy, FA; axial diffusivity, λ//), were acquired in the early stage and compared with functional outcomes by using correlation analysis and stepwise multivariable linear regression. Residual tissue SCA at the injury epicenter and residual tissue FA/remote normal-like tissue FA were correlated with the early-stage PS and GS. The extent of lesion site λ///residual tissue λ// in the early stage after SCI was correlated with the chronic-stage GS. The ratios of lesion site λ// to residual tissue λ// and early-stage GS were predictive of the improvement in the PS at follow-up. Similarly, the ratios of lesion site λ// to residual tissue λ// and early-stage PS best predicted chronic GS recovery. Our findings demonstrate the predictive power of MRI combined with the early data-driven gait indexes for long-term outcomes. Such an approach may help clinicians to predict functional recovery accurately.
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Affiliation(s)
- Jia-Sheng Rao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University
| | - Can Zhao
- Institute of Rehabilitation Engineering, China Rehabilitation Science Institute.,School of Rehabilitation, Capital Medical University
| | - Shu-Sheng Bao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University
| | - Ting Feng
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University
| | - Meng Xu
- Department of Orthopedics, The First Medical Center of PLA General Hospital
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11
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Abstract
Spinal cord injury (SCI) destroys the sensorimotor pathway and blocks the information flow between the peripheral nerve and the brain, resulting in autonomic function loss. Numerous studies have explored the effects of obstructed information flow on brain structure and function and proved the extensive plasticity of the brain after SCI. Great progress has also been achieved in therapeutic strategies for SCI to restore the "re-innervation" of the cerebral cortex to the limbs to some extent. Although no thorough research has been conducted, the changes of brain structure and function caused by "re-domination" have been reported. This article is a review of the recent research progress on local structure, functional changes, and circuit reorganization of the cerebral cortex after SCI. Alterations of structure and electrical activity characteristics of brain neurons, features of brain functional reorganization, and regulation of brain functions by reconfigured information flow were also explored. The integration of brain function is the basis for the human body to exercise complex/fine movements and is intricately and widely regulated by information flow. Hence, its changes after SCI and treatments should be considered.
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Affiliation(s)
- Can Zhao
- Institute of Rehabilitation Engineering, China Rehabilitation Science Institute, Beijing, China
- School of Rehabilitation, Capital Medical University, Beijing, China
| | - Shu-Sheng Bao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Meng Xu
- Department of Orthopedics, The First Medical Center of PLA General Hospital, Beijing, China
| | - Jia-Sheng Rao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
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12
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Zheng W, Wang L, Chen Q, Li X, Chen X, Qin W, Li K, Lu J, Chen N. Functional Reorganizations Outside the Sensorimotor Regions Following Complete Thoracolumbar Spinal Cord Injury. J Magn Reson Imaging 2021; 54:1551-1559. [PMID: 34060693 DOI: 10.1002/jmri.27764] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 05/20/2021] [Accepted: 05/21/2021] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND Studies have shown that loss of sensorimotor function in spinal cord injury (SCI) leads to brain functional reorganization, which may play important roles in motor function recovery. However, the specific functional changes following SCI are still poorly understood. PURPOSE To investigate whether there are functional reorganizations outside the sensorimotor regions after complete thoracolumbar SCI (CTSCI), and how these reorganizations are associated with clinical manifestations. STUDY TYPE Prospective. SUBJECTS Eighteen CTSCI patients (28-67 years of age; 16 men) and 18 age-, gender-matched healthy controls (HCs) (27-64 years of age; 16 men). FIELD STRENGTH/SEQUENCE Resting-state functional magnetic resonance imaging (RS-fMRI) using echo-planar-imaging (EPI) sequence at 3.0 T. ASSESSMENT Data preprocessing was performed using Data Processing Assistant for Resting-State fMRI (DPARSF). Amplitude of low-frequency fluctuations (ALFF) was used to characterize regional neural function, and seed-based functional connectivity (FC) was used to evaluate the functional integration of the brain network. STATISTICAL TESTS Two-sample t-tests were used for ALFF and FC measures (the data conform to the normal distribution), partial correlation analysis was used to analyze the correlation between clinical and imaging indicators, and receiver operating characteristic (ROC) analysis was used to search for sensitive imaging indicators. RESULTS Compared with HCs, CTSCI patients showed decreased ALFF in right lingual gyrus (LG), increased ALFF in right middle frontal gyrus (MFG), and decreased FC between the right LG and Vermis_3 (cluster-level FWE correction with P < 0.05). Subsequent correlation analyses revealed that decreased FC between the right LG and Vermis_3 positively correlated with the visual analog scale (VAS) (P = 0.043, r = 0.443). Finally, the ROC analysis showed that the area under the curve (AUC) of FC value between right LG and Vermis3 was 0.881. DATA CONCLUSION These findings suggest a possible theoretical basis of the mechanism of visual-, emotion-, and cognition-related techniques in rehabilitation training for CTSCI.
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Affiliation(s)
- Weimin Zheng
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Ling Wang
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Qian Chen
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Xuejing Li
- Department of Radiology, China Rehabilitation Research Center, Beijing, China
| | - Xin Chen
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Wen Qin
- Department of Radiology, Tianjin Medical University General Hospital, Tianjin, China
| | - Kuncheng Li
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Jie Lu
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
| | - Nan Chen
- Department of Radiology, Xuanwu Hospital, Capital Medical University, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, Beijing, China
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13
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Li X, Chen Q, Zheng W, Chen X, Wang L, Qin W, Li K, Lu J, Chen N. Inconsistency between cortical reorganization and functional connectivity alteration in the sensorimotor cortex following incomplete cervical spinal cord injury. Brain Imaging Behav 2021; 14:2367-2377. [PMID: 31444779 DOI: 10.1007/s11682-019-00190-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The aim of this study was to explore whether there will be any alterations in sensorimotor-related cortex and the possible causes of sensorimotor dysfunction after incomplete cervical spinal cord injury (ICSCI). Structural and resting-state functional magnetic resonance imaging (rs-fMRI) of nineteen ICSCI patients and nineteen healthy controls (HCs) was acquired. Voxel based morphometry (VBM) and tract-based spatial statistics were performed to assess differences in gray matter volume (GMV) and white matter integrity between ICSCI patients and HCs. Whole brain functional connectivity (FC) was analyzed using the results of VBM as seeds. Associations between the clinical variables and the brain changes were studied. Compared with HCs, ICSCI patients demonstrated reduced GMV in the right fusiform gyrus (FG) and left orbitofrontal cortex (OFC) but no changes in areas directly related to sensorimotor function. There were no significant differences in brain white matter. Additionally, the FC in the left primary sensorimotor cortex and cerebellum decreased when the FG and OFC, respectively, were used as seeds. Subsequent relevance analysis suggests a weak positive correlation between the left OFC's GMV and visual analog scale (VAS) scores. In conclusion, brain structural changes following ICSCI occur mainly in certain higher cognitive regions, such as the FG and OFC, rather than in the brain areas directly related to sensation or motor control. The functional areas of the brain that are related to cognitive processing may play an important role in sensorimotor dysfunction through the decreased FC with sensorimotor areas after ICSCI. Therefore, cognition-related functional training may play an important role in rehabilitation of sensorimotor function after ICSCI.
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Affiliation(s)
- Xuejing Li
- Department of Radiology, Xuanwu Hospital, Capital Medical University, No. 45 Chang-chun St, Xicheng District, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, No. 45 Chang-chun St, Xicheng District, Beijing, China
| | - Qian Chen
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing, China
| | - Weimin Zheng
- Department of Radiology, Aerospace Central Hospital, No. 15 Yuquan Road, Haidian District, Beijing, China
| | - Xin Chen
- Department of Radiology, Xuanwu Hospital, Capital Medical University, No. 45 Chang-chun St, Xicheng District, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, No. 45 Chang-chun St, Xicheng District, Beijing, China
| | - Ling Wang
- Department of Radiology, Xuanwu Hospital, Capital Medical University, No. 45 Chang-chun St, Xicheng District, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, No. 45 Chang-chun St, Xicheng District, Beijing, China
| | - Wen Qin
- Department of Radiology, Tianjin Medical University General Hospital, No. 154, Anshan Road, Heping District, Tianjin, China
| | - Kuncheng Li
- Department of Radiology, Xuanwu Hospital, Capital Medical University, No. 45 Chang-chun St, Xicheng District, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, No. 45 Chang-chun St, Xicheng District, Beijing, China
| | - Jie Lu
- Department of Radiology, Xuanwu Hospital, Capital Medical University, No. 45 Chang-chun St, Xicheng District, Beijing, China.,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, No. 45 Chang-chun St, Xicheng District, Beijing, China
| | - Nan Chen
- Department of Radiology, Xuanwu Hospital, Capital Medical University, No. 45 Chang-chun St, Xicheng District, Beijing, China. .,Beijing Key Laboratory of Magnetic Resonance Imaging and Brain Informatics, No. 45 Chang-chun St, Xicheng District, Beijing, China.
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14
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Cerebellar contribution to sensorimotor adaptation deficits in humans with spinal cord injury. Sci Rep 2021; 11:2507. [PMID: 33510183 PMCID: PMC7843630 DOI: 10.1038/s41598-020-77543-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 10/29/2020] [Indexed: 11/08/2022] Open
Abstract
Humans with spinal cord injury (SCI) show deficits in associating motor commands and sensory feedback. Do these deficits affect their ability to adapt movements to new demands? To address this question, we used a robotic exoskeleton to examine learning of a sensorimotor adaptation task during reaching movements by distorting the relationship between hand movement and visual feedback in 22 individuals with chronic incomplete cervical SCI and 22 age-matched control subjects. We found that SCI individuals showed a reduced ability to learn from movement errors compared with control subjects. Sensorimotor areas in anterior and posterior cerebellar lobules contribute to learning of movement errors in intact humans. Structural brain imaging showed that sensorimotor areas in the cerebellum, including lobules I-VI, were reduced in size in SCI compared with control subjects and cerebellar atrophy increased with increasing time post injury. Notably, the degree of spared tissue in the cerebellum was positively correlated with learning rates, indicating participants with lesser atrophy showed higher learning rates. These results suggest that the reduced ability to learn from movement errors during reaching movements in humans with SCI involves abnormalities in the spinocerebellar structures. We argue that this information might help in the rehabilitation of people with SCI.
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15
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Melo MC, Macedo DR, Soares AB. Divergent Findings in Brain Reorganization After Spinal Cord Injury: A Review. J Neuroimaging 2020; 30:410-427. [PMID: 32418286 DOI: 10.1111/jon.12711] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 03/02/2020] [Accepted: 03/24/2020] [Indexed: 12/12/2022] Open
Abstract
Spinal cord injury (SCI) leads to a general lack of sensory and motor functions below the level of injury and may promote deafferentation-induced brain reorganization. Functional magnetic resonance imaging (fMRI) has been established as an essential tool in neuroscience research and can precisely map the spatiotemporal distribution of brain activity. Task-based fMRI experiments associated with the tongue, upper limbs, or lower limbs have been used as the primary paradigms to study brain reorganization following SCI. A review of the current literature on the subject shows one common trait: while most articles agree that brain networks are usually preserved after SCI, and that is not the case as some articles describe possible alterations in brain activation after the lesion. There is no consensus if those alterations indeed occur. In articles that show alterations, there is no agreement if they are transient or permanent. Besides, there is no consensus on which areas are most prone to activation changes, or on the intensity and direction (increase vs. decrease) of those possible changes. In this article, we present a critical review of the literature and trace possible reasons for those contradictory findings on brain reorganization following SCI. fMRI studies based on the ankle dorsiflexion, upper-limb, and tongue paradigms are used as case studies for the analyses.
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Affiliation(s)
- Mariana Cardoso Melo
- Biomedical Engineering Lab, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Dhainner Rocha Macedo
- Biomedical Engineering Lab, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
| | - Alcimar Barbosa Soares
- Biomedical Engineering Lab, Federal University of Uberlandia, Uberlandia, Minas Gerais, Brazil
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16
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Karunakaran KD, Yuan R, He J, Zhao J, Cui JL, Zang YF, Zhang Z, Alvarez TL, Biswal BB. Resting-State Functional Connectivity of the Thalamus in Complete Spinal Cord Injury. Neurorehabil Neural Repair 2020; 34:122-133. [PMID: 31904298 DOI: 10.1177/1545968319893299] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Background. Neuroimaging studies of spinal cord injury (SCI) have mostly examined the functional organization of the cortex, with only limited focus on the subcortical substrates of the injury. However, thalamus is an important modulator and sensory relay that requires investigation at a subnuclei level to gain insight into the neuroplasticity following SCI. Objective. To use resting-state functional magnetic resonance imaging to examine the functional connectivity (FC) of thalamic subnuclei in complete SCI patients. Methods. A seed-based connectivity analysis was applied for 3 thalamic subnuclei: pulvinar, mediodorsal, and ventrolateral nucleus in each hemisphere. A nonparametric 2-sample t test with permutations was applied for each of the 6 thalamic seeds to compute FC differences between 22 healthy controls and 19 complete SCI patients with paraplegia. Results. Connectivity analysis showed a decrease in the FC of the bilateral mediodorsal nucleus with right superior temporal gyrus and anterior cingulate cortex in the SCI group. Similarly, the left ventrolateral nucleus exhibited decreased FC with left superior temporal gyrus in SCI group. In contrast, left pulvinar nucleus demonstrated an increase in FC with left inferior frontal gyrus and left inferior parietal lobule in SCI group. Our findings also indicate a negative relationship between postinjury durations and thalamic FC to regions of sensorimotor and visual cortices, where longer postinjury durations (~12 months) is associated with higher negative connectivity between these regions. Conclusion. This study provides evidence for reorganization in the thalamocortical connections known to be involved in multisensory integration and affective processing, with possible implications in the generation of sensory abnormalities after SCI.
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Affiliation(s)
| | - Rui Yuan
- Stanford School of Medicine, Stanford, CA, USA
| | - Jie He
- Hebei Medical University Third Affiliated Hospital, Shijazhuang, Hebei, China
| | - Jian Zhao
- Armed Police Force Hospital of Sichuan, Leshan, Sichuan, China
| | - Jian-Ling Cui
- Hebei Medical University Third Affiliated Hospital, Shijazhuang, Hebei, China
| | - Yu-Feng Zang
- Hangzhou Normal University Affiliated Hospital, Hangzhou, Zheijang, China
| | - Zhong Zhang
- Hebei Medical University Third Affiliated Hospital, Shijazhuang, Hebei, China
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17
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Wei RH, Zhao C, Rao JS, Zhao W, Wei YQ, Zhou X, Tian PY, Liu RX, Yang ZY, Li XG. Neuromuscular control pattern in rhesus monkeys during bipedal walking. Exp Anim 2019; 68:341-349. [PMID: 30930341 PMCID: PMC6699981 DOI: 10.1538/expanim.18-0180] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Walking is characterized by repetitive limb movements associated with highly structured patterns of muscle activity. The causal relationships between the muscle activities and hindlimb segments of walking are difficult to decipher. This study investigated these particular relationships and clarified whether they are correlated with speed to further understand the neuromuscular control pattern. Four adult female rhesus monkeys (Macaca mulatta) were selected to record gait parameters while walking on a bipedal treadmill at speeds of 0.2, 0.8, 1.4, and 2.0 km/h. We recorded 3 ipsilateral hindlimb muscles by surface recording. In this study, we calculated the correlations between electromyography (EMG) and kinematic parameters (24 EMG*17 kinematic parameters). Of the 408 calculated coefficients, 71.6% showed significant linear correlations. Significant linear correlations were found between muscle activity, such as burst amplitudes and the integral of muscle activity, and the corresponding kinematic parameters of each joint. Most of these relationships were speed independent (91.7% of all variables). Through correlation analysis, this study demonstrated a causal association between kinematic and EMG patterns of rhesus monkey locomotion. Individuals have particular musculoskeletal control patterns, and most of the relationships between hindlimb segments and muscles are speed independent. The current findings may enhance our understanding of neuromusculoskeletal control strategies.
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Affiliation(s)
- Rui-Han Wei
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Can Zhao
- Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,School of Instrumentation and Optoelectronic Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Jia-Sheng Rao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Wen Zhao
- Department of Neurobiology, Capital Medical University, No. 10 Xitoutiao Road, Youanmenwai, Xicheng District, Beijing 100069, P.R. China
| | - Yan-Qin Wei
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Xia Zhou
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Peng-Yu Tian
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Ruo-Xi Liu
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Zhao-Yang Yang
- Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Department of Neurobiology, Capital Medical University, No. 10 Xitoutiao Road, Youanmenwai, Xicheng District, Beijing 100069, P.R. China
| | - Xiao-Guang Li
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Department of Neurobiology, Capital Medical University, No. 10 Xitoutiao Road, Youanmenwai, Xicheng District, Beijing 100069, P.R. China
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18
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Rao JS, Liu Z, Zhao C, Wei RH, Liu RX, Zhao W, Zhou X, Tian PY, Yang ZY, Li XG. Image correction for diffusion tensor imaging of Rhesus monkey thoracic spinal cord. J Med Primatol 2019; 48:320-328. [PMID: 31148186 DOI: 10.1111/jmp.12422] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 04/03/2019] [Accepted: 05/12/2019] [Indexed: 02/02/2023]
Abstract
BACKGROUND The relatively tiny spinal cord of non-human primate (NHP) causes increased challenge in diffusion tensor imaging (DTI) post-processing. This study aimed to establish a reliable correction strategy applied to clinical DTI images of NHP. METHODS Six normal and partial spinal cord injury (SCI) rhesus monkeys underwent 3T MR scanning. A correction strategy combining multiple iterations and non-rigid deformation was used for DTI image post-processing. Quantitative evaluations were then conducted to investigate effects of distortion correction. RESULTS After correction, longitudinal geometric distortion, global distortion, and residual distance errors were all significantly decreased (P < 0.05). Fractional anisotropy at the injured site was remarkably lower than that at the contralateral site (P = 0.0488) and was substantially lower than those at the adjacent superior (P = 0.0157) and inferior (P = 0.0128) areas at the same side. CONCLUSIONS Our image correction strategy can improve the quality of the DTI images of NHP thoracic cords, contributing to the development of SCI preclinical research.
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Affiliation(s)
- Jia-Sheng Rao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Department of Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.,Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, China
| | - Zuxiang Liu
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,Innovation Center of Excellence on Brain Science, Chinese Academy of Sciences, Beijing, China.,Department of Biology, College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Can Zhao
- Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, China.,Department of Measurement Control and Information Technology, School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China
| | - Rui-Han Wei
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Department of Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Ruo-Xi Liu
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Department of Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Wen Zhao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xia Zhou
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Department of Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Peng-Yu Tian
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Department of Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Zhao-Yang Yang
- Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, China.,Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xiao-Guang Li
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, Department of Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.,Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, China
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19
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Wilson S, Nagel SJ, Frizon LA, Fredericks DC, DeVries-Watson NA, Gillies GT, Howard MA. The Hemisection Approach in Large Animal Models of Spinal Cord Injury: Overview of Methods and Applications. J INVEST SURG 2018; 33:240-251. [PMID: 30380340 DOI: 10.1080/08941939.2018.1492048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Introduction: Translating basic science research into a safe and effective therapy for spinal cord injury (SCI) requires suitable large animal models for testing both implantable devices and biologic approaches to better approximate human anatomy and function. Hemisection lesions, routinely used for investigational purposes in small animals, are less frequently described in large animals that might be appropriate for translational studies. Size constraints of small animals (mice and rats) limits the predictability of the findings when scaled up. Our goal is to review the status of hemisection SCI in large animals across species and time to prepare for the testing of a novel intradural spinal cord stimulation device for control of spasticity in an ovine model. Methods and Results: We surveyed the literature on hemisection in quadrupeds and nonhuman primates, and catalogued the species, protocols and outcomes of the experimental work in this field. Feline, lapine, canine, simian, porcine, ovine and bovine models were the primary focal points. There is a consistent body of literature reporting use of the hemisection approach in large animals, but with differences in surgical technique depending on the goals and nature of the individual studies. While the injuries are not always consistent, the experimental variability is generally lower than that of the contusion-based approach. In general, as the body size of the animal increases, animal care requirements and the associated costs follow. In most cases, this is inversely correlated with the number of animals used in hemisection models. Conclusions: The hemisection approach to modeling SCI is straightforward compared with other methods such as the contusive impact and enables the transection of isolated ascending and descending tracts and segment specific cell bodies. This has certain advantages in models investigating post-injury axonal regrowth. However, this approach is not generally in line with the patho-physiologies encountered in SCI patients. Even so, the ability to achieve more control over the level of injury makes it a useful adjunct to contusive and ischemic approaches, and suggests a useful role in future translational studies.
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Affiliation(s)
- S Wilson
- Department of Neurosurgery, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - S J Nagel
- Center for Neurological Restoration, Cleveland Clinic, Cleveland, OH, USA
| | - L A Frizon
- Center for Neurological Restoration, Cleveland Clinic, Cleveland, OH, USA
| | - D C Fredericks
- Department of Orthopedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - N A DeVries-Watson
- Department of Orthopedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - G T Gillies
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, USA
| | - M A Howard
- Department of Neurosurgery, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
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20
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Jo HJ, Di Lazzaro V, Perez MA. Effect of coil orientation on motor-evoked potentials in humans with tetraplegia. J Physiol 2018; 596:4909-4921. [PMID: 29923194 DOI: 10.1113/jp275798] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 06/12/2018] [Indexed: 12/11/2022] Open
Abstract
KEY POINTS Although corticospinal function changes following spinal cord injury (SCI), the extent to which we can activate the corticospinal tract after injury remains poorly understood. To address this question, we used transcranial magnetic stimulation over the hand representation of the primary motor cortex to elicit motor-evoked potentials (MEPs) using posterior-anterior and anterior-posterior induced currents in the brain and compared them with responses evoked using lateral-medial currents in participants with and without cervical incomplete SCI during small levels of index finger abduction. We found prolonged MEP latencies in all coil orientations in SCI compared to control subjects. However, the latencies of MEPs elicited by posterior-anterior and anterior-posterior compared to lateral-medial stimulation were shorter in SCI compared to controls, particularly for MEPs elicited by anterior-posterior currents. Our findings demonstrate for the first time that corticospinal responses elicited by different directions of the induced current in the brain are differentially affected after SCI. ABSTRACT The corticospinal tract undergoes reorganization following spinal cord injury (SCI). However, the extent to which we can activate corticospinal neurons using non-invasive stimulation after injury remains poorly understood. To address this question, we used transcranial magnetic stimulation over the hand representation of the primary motor cortex to elicit motor-evoked potentials (MEPs) using posterior-anterior (PA) and anterior-posterior (AP) induced currents in the brain and compared them with the responses evoked by direct activation of corticospinal axons using lateral-medial (LM) currents. Testing was completed during small levels of index finger abduction in humans with and without (controls) cervical incomplete SCI. We found prolonged MEP latencies in individuals with SCI in all coil orientations compared to controls. However, latencies of MEPs elicited by PA and AP stimulation relative to those elicited by LM stimulation were shorter in SCI compared to control subjects. Notably, the largest difference between SCI and control subjects was present in MEPs elicited by AP currents. Using a novel controllable pulse parameter transcranial magnetic stimulation, we also found that MEPs elicited by AP currents with 30 μs compared to 60 and 120 μs pulse width had increased latency in controls but not in SCI subjects. Our findings demonstrate that differences between corticospinal responses elicited by AP and PA induced currents were not preserved in humans with tetraplegia and suggest that neural structures activated by AP currents change largely after the injury.
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Affiliation(s)
- Hang Jin Jo
- University of Miami, Department of Neurological Surgery, The Miami Project to Cure Paralysis, Miami, FL, USA.,Bruce W. Carter Department of Veterans Affairs Medical Center, Miami, FL, USA
| | - Vincenzo Di Lazzaro
- Unit of Neurology, Neurophysiology, Neurobiology, Department of Medicine, Università Campus Bio-Medico di Roma, Rome, Italy
| | - Monica A Perez
- University of Miami, Department of Neurological Surgery, The Miami Project to Cure Paralysis, Miami, FL, USA.,Bruce W. Carter Department of Veterans Affairs Medical Center, Miami, FL, USA
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21
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Wei RH, Zhao C, Rao JS, Zhao W, Zhou X, Tian PY, Song W, Ji R, Zhang AF, Yang ZY, Li XG. The kinematic recovery process of rhesus monkeys after spinal cord injury. Exp Anim 2018; 67:431-440. [PMID: 29769463 PMCID: PMC6219880 DOI: 10.1538/expanim.18-0023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
After incomplete spinal cord injury (SCI), neural circuits may be plastically
reconstructed to some degree, resulting in extensive functional locomotor recovery. The
present study aimed to observe the post-SCI locomotor recovery of rhesus monkey hindlimbs
and compare the recovery degrees of different hindlimb parts, thus revealing the recovery
process of locomotor function. Four rhesus monkeys were chosen for thoracic hemisection
injury. The hindlimb locomotor performance of these animals was recorded before surgery,
as well as 6 and 12 weeks post-lesion. Via principal component analysis, the relevant
parameters of the limb endpoint, pelvis, hindlimb segments, and joints were processed and
analyzed. Twelve weeks after surgery, partial kinematic recovery was observed at the limb
endpoint, shank, foot, and knee joints, and the locomotor performance of the ankle joint
even recovered to the pre-lesion level; the elevation angle of the thigh and hip joints
showed no obvious recovery. Generally, different parts of a monkey hindlimb had different
spontaneous recovery processes; specifically, the closer the part was to the distal end,
the more extensive was the locomotor function recovery. Therefore, we speculate that
locomotor recovery may be attributed to plastic reconstruction of the motor circuits that
are mainly composed of corticospinal tract. This would help to further understand the
plasticity of motor circuits after spinal cord injury.
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Affiliation(s)
- Rui-Han Wei
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Can Zhao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,School of Instrument Science and Opto-Electronic Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Jia-Sheng Rao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Wen Zhao
- Department of Neurobiology, Capital Medical University, No. 10 Xitoutiao Road, Youanmenwai, Xicheng District, Beijing 100191, P.R. China
| | - Xia Zhou
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Peng-Yu Tian
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China
| | - Wei Song
- Rehabilitation Engineering Research Institute, China Rehabilitation Research Center, No. 10 Jiaomenbei Road, Fengtai District, Beijing 100068, P.R. China
| | - Run Ji
- Human Biomechanics Laboratory, National Research Center for Rehabilitation Technical Aids, No. 1 Ronghuazhong Road, Daxing District, Beijing 100176, P.R. China
| | - Ai-Feng Zhang
- Beijing Friendship Hospital, Capital Medical University, No. 95 Yongan Road, Xicheng District, Beijing 100050, P.R. China
| | - Zhao-Yang Yang
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Department of Neurobiology, Capital Medical University, No. 10 Xitoutiao Road, Youanmenwai, Xicheng District, Beijing 100191, P.R. China
| | - Xiao-Guang Li
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Beijing International Cooperation Bases for Science and Technology on Biomaterials and Neural Regeneration, Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100083, P.R. China.,Department of Neurobiology, Capital Medical University, No. 10 Xitoutiao Road, Youanmenwai, Xicheng District, Beijing 100191, P.R. China
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22
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Hawasli AH, Rutlin J, Roland JL, Murphy RKJ, Song SK, Leuthardt EC, Shimony JS, Ray WZ. Spinal Cord Injury Disrupts Resting-State Networks in the Human Brain. J Neurotrauma 2018; 35:864-873. [PMID: 29179629 DOI: 10.1089/neu.2017.5212] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Despite 253,000 spinal cord injury (SCI) patients in the United States, little is known about how SCI affects brain networks. Spinal MRI provides only structural information with no insight into functional connectivity. Resting-state functional MRI (RS-fMRI) quantifies network connectivity through the identification of resting-state networks (RSNs) and allows detection of functionally relevant changes during disease. Given the robust network of spinal cord afferents to the brain, we hypothesized that SCI produces meaningful changes in brain RSNs. RS-fMRIs and functional assessments were performed on 10 SCI subjects. Blood oxygen-dependent RS-fMRI sequences were acquired. Seed-based correlation mapping was performed using five RSNs: default-mode (DMN), dorsal-attention (DAN), salience (SAL), control (CON), and somatomotor (SMN). RSNs were compared with normal control subjects using false-discovery rate-corrected two way t tests. SCI reduced brain network connectivity within the SAL, SMN, and DMN and disrupted anti-correlated connectivity between CON and SMN. When divided into separate cohorts, complete but not incomplete SCI disrupted connectivity within SAL, DAN, SMN and DMN and between CON and SMN. Finally, connectivity changed over time after SCI: the primary motor cortex decreased connectivity with the primary somatosensory cortex, the visual cortex decreased connectivity with the primary motor cortex, and the visual cortex decreased connectivity with the sensory parietal cortex. These unique findings demonstrate the functional network plasticity that occurs in the brain as a result of injury to the spinal cord. Connectivity changes after SCI may serve as biomarkers to predict functional recovery following an SCI and guide future therapy.
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Affiliation(s)
- Ammar H Hawasli
- 1 Department of Neurological Surgery, Washington University School of Medicine , Saint Louis, Missouri.,2 Department of Biomedical Engineering, Washington University School of Medicine , Saint Louis, Missouri.,3 Department of Orthopedic Surgery, Washington University School of Medicine , Saint Louis, Missouri
| | - Jerrel Rutlin
- 4 Department of Mallinckrodt Institute of Radiology, Washington University School of Medicine , Saint Louis, Missouri
| | - Jarod L Roland
- 1 Department of Neurological Surgery, Washington University School of Medicine , Saint Louis, Missouri
| | - Rory K J Murphy
- 5 Department of Neurosurgery, University of California San Francisco , California
| | - Sheng-Kwei Song
- 4 Department of Mallinckrodt Institute of Radiology, Washington University School of Medicine , Saint Louis, Missouri
| | - Eric C Leuthardt
- 1 Department of Neurological Surgery, Washington University School of Medicine , Saint Louis, Missouri.,2 Department of Biomedical Engineering, Washington University School of Medicine , Saint Louis, Missouri
| | - Joshua S Shimony
- 4 Department of Mallinckrodt Institute of Radiology, Washington University School of Medicine , Saint Louis, Missouri
| | - Wilson Z Ray
- 1 Department of Neurological Surgery, Washington University School of Medicine , Saint Louis, Missouri.,2 Department of Biomedical Engineering, Washington University School of Medicine , Saint Louis, Missouri
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23
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Athanasiou A, Klados MA, Pandria N, Foroglou N, Kavazidi KR, Polyzoidis K, Bamidis PD. A Systematic Review of Investigations into Functional Brain Connectivity Following Spinal Cord Injury. Front Hum Neurosci 2017; 11:517. [PMID: 29163098 PMCID: PMC5669283 DOI: 10.3389/fnhum.2017.00517] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 10/11/2017] [Indexed: 12/21/2022] Open
Abstract
Background: Complete or incomplete spinal cord injury (SCI) results in varying degree of motor, sensory and autonomic impairment. Long-lasting, often irreversible disability results from disconnection of efferent and afferent pathways. How does this disconnection affect brain function is not so clear. Changes in brain organization and structure have been associated with SCI and have been extensively studied and reviewed. Yet, our knowledge regarding brain connectivity changes following SCI is overall lacking. Methods: In this study we conduct a systematic review of articles regarding investigations of functional brain networks following SCI, searching on PubMed, Scopus and ScienceDirect according to PRISMA-P 2015 statement standards. Results: Changes in brain connectivity have been shown even during the early stages of the chronic condition and correlate with the degree of neurological impairment. Connectivity changes appear as dynamic post-injury procedures. Sensorimotor networks of patients and healthy individuals share similar patterns but new functional interactions have been identified as unique to SCI networks. Conclusions: Large-scale, multi-modal, longitudinal studies on SCI patients are needed to understand how brain network reorganization is established and progresses through the course of the condition. The expected insight holds clinical relevance in preventing maladaptive plasticity after SCI through individualized neurorehabilitation, as well as the design of connectivity-based brain-computer interfaces and assistive technologies for SCI patients.
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Affiliation(s)
- Alkinoos Athanasiou
- Laboratory of Medical Physics, Faculty of Medicine, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.,First Department of Neurosurgery, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Manousos A Klados
- Department of Biomedical Engineering, School of Life and Health Sciences, Aston University, Birmingham, United Kingdom
| | - Niki Pandria
- Laboratory of Medical Physics, Faculty of Medicine, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Nicolas Foroglou
- First Department of Neurosurgery, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Kyriaki R Kavazidi
- Laboratory of Medical Physics, Faculty of Medicine, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Konstantinos Polyzoidis
- First Department of Neurosurgery, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Panagiotis D Bamidis
- Laboratory of Medical Physics, Faculty of Medicine, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
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24
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Rao JS, Liu Z, Zhao C, Wei RH, Zhao W, Tian PY, Zhou X, Yang ZY, Li XG. Ketamine changes the local resting-state functional properties of anesthetized-monkey brain. Magn Reson Imaging 2017; 43:144-150. [PMID: 28755862 DOI: 10.1016/j.mri.2017.07.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/27/2017] [Accepted: 07/24/2017] [Indexed: 01/15/2023]
Abstract
OBJECTIVE Ketamine is a well-known anesthetic. 'Recreational' use of ketamine common induces psychosis-like symptoms and cognitive impairments. The acute and chronic effects of ketamine on relevant brain circuits have been studied, but the effects of single-dose ketamine administration on the local resting-state functional properties of the brain remain unknown. In this study, we aimed to assess the effects of single-dose ketamine administration on the brain local intrinsic properties. METHODS We used resting-state functional magnetic resonance imaging (rs-fMRI) to explore the ketamine-induced alterations of brain intrinsic properties. Seven adult rhesus monkeys were imaged with rs-fMRI to examine the fractional amplitude of low-frequency fluctuation (fALFF) and regional homogeneity (ReHo) in the brain before and after ketamine injection. Paired comparisons were used to detect the significantly altered regions. RESULTS Results showed that the fALFF of the prefrontal cortex (p=0.046), caudate nucleus (left side, p=0.018; right side, p=0.025), and putamen (p=0.020) in post-injection stage significantly increased compared with those in pre-injection period. The ReHo of nucleus accumbens (p=0.049), caudate nucleus (p=0.037), and hippocampus (p=0.025) increased after ketamine injection, but that of prefrontal cortex decreased (p<0.05). CONCLUSIONS These findings demonstrated that single-dose ketamine administration can change the regional intensity and synchronism of brain activity, thereby providing evidence of ketamine-induced abnormal resting-state functional properties in primates. This evidence may help further elucidate the effects of ketamine on the cerebral resting status.
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Affiliation(s)
- Jia-Sheng Rao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China.
| | - Zuxiang Liu
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Can Zhao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
| | - Rui-Han Wei
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
| | - Wen Zhao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Peng-Yu Tian
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
| | - Xia Zhou
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
| | - Zhao-Yang Yang
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - Xiao-Guang Li
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China; Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
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25
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Sperry MM, Kandel BM, Wehrli S, Bass KN, Das SR, Dhillon PS, Gee JC, Barr GA. Mapping of pain circuitry in early post-natal development using manganese-enhanced MRI in rats. Neuroscience 2017; 352:180-189. [PMID: 28391012 PMCID: PMC7276061 DOI: 10.1016/j.neuroscience.2017.03.052] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 03/08/2017] [Accepted: 03/28/2017] [Indexed: 12/14/2022]
Abstract
Premature or ill full-term infants are subject to a number of noxious procedures as part of their necessary medical care. Although we know that human infants show neural changes in response to such procedures, we know little of the sensory or affective brain circuitry activated by pain. In rodent models, the focus has been on spinal cord and, more recently, midbrain and medulla. The present study assesses activation of brain circuits using manganese-enhanced magnetic resonance imaging (MEMRI). Uptake of manganese, a paramagnetic contrast agent that is transported across active synapses and along axons, was measured in response to a hindpaw injection of dilute formalin in 12-day-old rat pups, the age at which rats begin to show aversion learning and which is roughly the equivalent of full-term human infants. Formalin induced the oft-reported biphasic response at this age and induced a conditioned aversion to cues associated with its injection, thus demonstrating the aversiveness of the stimulation. Morphometric analyses, structural equation modeling and co-expression analysis showed that limbic and sensory paths were activated, the most prominent of which were the prefrontal and anterior cingulate cortices, nucleus accumbens, amygdala, hypothalamus, several brainstem structures, and the cerebellum. Therefore, both sensory and affective circuits, which are activated by pain in the adult, can also be activated by noxious stimulation in 12-day-old rat pups.
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Affiliation(s)
- M M Sperry
- Department of Bioengineering, University of Pennsylvania, United States
| | - B M Kandel
- Penn Image Computing and Science Laboratory, Department of Radiology, University of Pennsylvania, United States
| | - S Wehrli
- NMR Core, Children's Hospital of Philadelphia, United States
| | - K N Bass
- Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, United States
| | - S R Das
- Penn Image Computing and Science Laboratory, Department of Radiology, University of Pennsylvania, United States
| | - P S Dhillon
- Penn Image Computing and Science Laboratory, Department of Radiology, University of Pennsylvania, United States
| | - J C Gee
- Penn Image Computing and Science Laboratory, Department of Radiology, University of Pennsylvania, United States
| | - G A Barr
- Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, United States.
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26
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Marinovic W. Focus of attention changes intracortical excitability in the primary motor cortex. Acta Physiol (Oxf) 2017; 220:179-180. [PMID: 27804214 DOI: 10.1111/apha.12822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- W. Marinovic
- Curtin University - School of Psychology and Speech Pathology; Perth WA Australia
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27
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Zhao C, Song W, Rao JS, Zhao W, Wei RH, Zhou X, Tian PY, Yang ZY, Li XG. Combination of kinematic analyses and diffusion tensor tractrography to evaluate the residual motor functions in spinal cord-hemisected monkeys. J Med Primatol 2017; 46:239-247. [PMID: 28543057 DOI: 10.1111/jmp.12276] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/16/2017] [Indexed: 12/01/2022]
Abstract
BACKGROUND Spinal cord injury (SCI) causes loss of locomotor functions. Nowadays, the relationship between the residual locomotion after SCI and the diffusion tensor tractography (DTT) results still remains unclear. METHODS Four rhesus monkeys were suffered thoracic cord hemisection. Kinematic evaluation and DTT were performed prior- and post-SCI (6 and 12 weeks). The longitudinal changes of gait parameters and the DTT parameters were analyzed for the injury-contralateral hindlimb. The correlations between gaits and DTT parameters were also investigated. RESULTS Almost gait parameters significantly changed after SCI, meanwhile, the caudal-rostral connection rate of DTT showed negative correlation with all gait parameters, demonstrating that the locomotor changes of the injury-contralateral hindlimb were associated with the ratio of residual fibers. CONCLUSIONS The combinatory use of gait analysis and DTT has been demonstrated to be sensitive to locomotion changes after SCI, and may therefore have potential applications in the pre-clinical studies of SCI.
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Affiliation(s)
- Can Zhao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Wei Song
- Rehabilitation Engineering Research Institute, China Rehabilitation Research Center, Beijing, China
| | - Jia-Sheng Rao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Wen Zhao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Rui-Han Wei
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Xia Zhou
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Peng-Yu Tian
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Zhao-Yang Yang
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
| | - Xiao-Guang Li
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.,Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, China
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28
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Affiliation(s)
- P. B. Persson
- Institut fuer Vegetative Physiologie; Charité Universitaetsmedizin Berlin; Berlin Germany
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29
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Kaushal M, Oni-Orisan A, Chen G, Li W, Leschke J, Ward BD, Kalinosky B, Budde MD, Schmit BD, Li SJ, Muqeet V, Kurpad SN. Evaluation of Whole-Brain Resting-State Functional Connectivity in Spinal Cord Injury: A Large-Scale Network Analysis Using Network-Based Statistic. J Neurotrauma 2017; 34:1278-1282. [DOI: 10.1089/neu.2016.4649] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Affiliation(s)
- Mayank Kaushal
- Department of Biomedical Engineering, Marquette University Milwaukee, Wisconsin
| | | | - Gang Chen
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Wenjun Li
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Jack Leschke
- Department of Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - B. Douglas Ward
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Benjamin Kalinosky
- Department of Biomedical Engineering, Marquette University Milwaukee, Wisconsin
| | - Matthew D. Budde
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Brian D. Schmit
- Department of Biomedical Engineering, Marquette University Milwaukee, Wisconsin
| | - Shi-Jiang Li
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Vaishnavi Muqeet
- Department of Physical Medicine and Rehabilitation, Clement J. Zablocki Veterans Affairs Medical Center, Milwaukee, Wisconsin
| | - Shekar N. Kurpad
- Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin
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