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Khot S, Tackley G, Choy E. How to Distinguish Non-Inflammatory from Inflammatory Pain in RA? Curr Rheumatol Rep 2024:10.1007/s11926-024-01159-4. [PMID: 39120749 DOI: 10.1007/s11926-024-01159-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/17/2024] [Indexed: 08/10/2024]
Abstract
PURPOSE OF THE REVIEW Managing non-inflammatory pain in rheumatoid arthritis (RA) can be a huge burden for the rheumatologist. Pain that persists despite optimal RA treatment is extremely challenging for patient and physician alike. Here, we outline the latest research relevant to distinguishing non-inflammatory from inflammatory RA pain and review the current understanding of its neurobiology and management. RECENT FINDINGS Nociplastic pain is a recently introduced term by the international pain community. Its definition encompasses the non-inflammatory pain of RA and describes pain that is not driven by inflamed joints or compromised nerves, but that is instead driven by a functional reorganisation of the central nervous system (CNS). Insights from all areas of nociplastic pain research, including fibromyalgia, support a personalised pain management approach for non-inflammatory pain of RA, with evidence-based guidelines favouring use of non-pharmacological interventions. Future developments include novel CNS targeting pharmacotherapeutic approaches to treat nociplastic pain.
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Affiliation(s)
- Sharmila Khot
- Department of Anaesthesia, Intensive Care and Pain Medicine, Cardiff and Vale University Health Board, Cardiff CF14 4XW and Cardiff University Brain Research Imaging Centre (CUBRIC), Cardiff University, Maindy Road, Cardiff, Wales, CF24 4HQ, UK.
| | - George Tackley
- Cardiff University Brain Research Imaging Centre (CUBRIC), Cardiff University, Maindy Road, Cardiff, Wales, CF24 4HQ, UK
| | - Ernest Choy
- Head of Rheumatology and Translational Research at the Division of Infection and Immunity and Director of the Cardiff Regional Experimental Arthritis Treatment and Evaluation (CREATE) Centre at Cardiff University School of Medicine, Cardiff, Wales, UK, CF14 4YS
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Canlı K, Van Oijen J, Van Oosterwijck J, Meeus M, Van Oosterwijck S, De Meulemeester K. Influence of sensory retraining on cortical reorganization in peripheral neuropathy: A systematic review. PM R 2024; 16:888-907. [PMID: 38155585 DOI: 10.1002/pmrj.13126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 11/19/2023] [Accepted: 12/14/2023] [Indexed: 12/30/2023]
Abstract
OBJECTIVE This study systematically reviewed the literature about sensory retraining effect in comparison to other rehabilitative techniques on cortical reorganization in patients with peripheral neuropathic pain. TYPE: Systematic review. LITERATURE SURVEY After an electronic search of PubMed, Web of Science, and Embase, risk of bias was assessed using the revised Cochrane risk of bias tool for randomized controlled trials and the ROBINS-1 (Risk of bias in non-randomized studies-of interventions) for non-randomized studies of intervention. METHODOLOGY The strength of conclusion was determined using the evidence-based guideline development approach. SYNTHESIS Limited evidence indicates a higher increase in cortical inhibition and a higher reduction in cortical activation during a motor task of the affected hemisphere after graded motor imagery compared to wait-list. Higher reductions in map volume (total excitability of the cortical representation) of the affected hemisphere after peripheral electrical stimulation (PES) were observed when compared to transcranial direct current stimulation (tDCS) or to sham treatment with limited evidence. No other differences in cortical excitability and representation of the affected and non-affected hemisphere were observed when comparing mirror therapy with sham therapy or tDCS, PES with sham therapy or tDCS, and graded motor imagery with wait-list. CONCLUSIONS Graded motor imagery and PES result in higher cortical excitability reductions of the affected hemisphere compared to wait-list, tDCS and sham treatment, respectively.
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Affiliation(s)
- Kübra Canlı
- Faculty of Physical Therapy and Rehabilitation, Hacettepe University, Ankara, Türkiye
| | - Joris Van Oijen
- Department of Rehabilitation Sciences, Spine, Pain and Head Research Unit Ghent, Ghent University, Ghent, Belgium
| | - Jessica Van Oosterwijck
- Department of Rehabilitation Sciences, Spine, Pain and Head Research Unit Ghent, Ghent University, Ghent, Belgium
- Pain in Motion International Research Group, Brussels, Belgium
| | - Mira Meeus
- Department of Rehabilitation Sciences, Spine, Pain and Head Research Unit Ghent, Ghent University, Ghent, Belgium
- Pain in Motion International Research Group, Brussels, Belgium
- Research Group MOVANT, Department of Rehabilitation Sciences and Physiotherapy (REVAKI), University of Antwerp, Antwerpen, Belgium
| | - Sophie Van Oosterwijck
- Department of Rehabilitation Sciences, Spine, Pain and Head Research Unit Ghent, Ghent University, Ghent, Belgium
- Pain in Motion International Research Group, Brussels, Belgium
- Research Foundation-Flanders (FWO), Brussels, Belgium
| | - Kayleigh De Meulemeester
- Department of Rehabilitation Sciences, Spine, Pain and Head Research Unit Ghent, Ghent University, Ghent, Belgium
- Pain in Motion International Research Group, Brussels, Belgium
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Jin S, Cho HJ. Cerebral hemodynamics as biomarkers for neuropathic pain in rats: a longitudinal study using a spinal nerve ligation model. Pain 2024:00006396-990000000-00655. [PMID: 38985168 DOI: 10.1097/j.pain.0000000000003332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Accepted: 06/07/2024] [Indexed: 07/11/2024]
Abstract
ABSTRACT Neuropathic pain is one of the most challenging types of pain to diagnose and treat, a problem exacerbated by the lack of a quantitative biomarker. Recently, several clinical and preclinical studies have shown that neuropathic pain induces cerebral hemodynamic changes as a result of neuroplasticity in the brain. Our hypothesis in this study is that neuropathic pain leads to cerebral hemodynamic changes over postoperative time in a spinal nerve ligation (SNL) rat model, which has not been longitudinally explored previously. Furthermore, by identifying multiple regional hemodynamic features that are the most distinct between SNL and sham groups, where the sham group underwent only an incision without SNL, it may be possible to classify the SNL group regardless of when the onset of pain occurs. We investigate cerebral hemodynamic changes using dynamic susceptibility contrast magnetic resonance imaging in a rat model up to 28 days after ligating L5/L6 spinal nerves. We trained a linear support vector machine with relative cerebral blood volume data from different brain regions and found that the prediction model trained on the nucleus accumbens, motor cortex, pretectal area, and thalamus classified the SNL group and sham group at a 79.27% balanced accuracy, regardless of when the onset of pain occurred (SNL/sham: 60/45 data points). From the use of the SNL model without prior knowledge of the onset time of pain, the current findings highlight the potential of relative cerebral blood volume in the 4 highlighted brain regions as a biomarker for neuropathic pain.
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Affiliation(s)
- Seokha Jin
- Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
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Swanson KA, Nguyen KL, Gupta S, Ricard J, Bethea JR. TNFR1/p38αMAPK signaling in Nex + supraspinal neurons regulates estrogen-dependent chronic neuropathic pain. Brain Behav Immun 2024; 119:261-271. [PMID: 38570102 PMCID: PMC11162907 DOI: 10.1016/j.bbi.2024.03.050] [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] [Received: 10/10/2023] [Revised: 03/26/2024] [Accepted: 03/30/2024] [Indexed: 04/05/2024] Open
Abstract
Upregulation of soluble tumor necrosis factor (sTNF) cytokine signaling through TNF receptor 1 (TNFR1) and subsequent neuronal hyperexcitability are observed in both animal models and human chronic neuropathic pain (CNP). Previously, we have shown that estrogen modulates sTNF/TNFR1 signaling in CNP, which may contribute to female prevalence of CNP. The estrogen-dependent role of TNFR1-mediated supraspinal neuronal circuitry in CNP remains unknown. In this study, we interrogated the intersect between supraspinal TNFR1 mediated neuronal signaling and sex specificity by selectively removing TNFR1 in Nex + neurons in adult mice (NexCreERT2::TNFR1f/f). We determined that mechanical hypersensitivity induced by chronic constriction injury (CCI) decreases over time in males, but not in females. Subsequently, we investigated two downstream pathways, p38MAPK and NF-κB, important in TNFR1 signaling and injury response. We detected p38MAPK and NF-κB activation in male cortical tissue; however, p38MAPK phosphorylation was reduced in NexCreERT2::TNFR1f/f males. We observed a similar recovery from acute pain in male mice following CCI when p38αMAPK was knocked out of supraspinal Nex + neurons (NexCreERT2::p38αMAPKf/f), while chronic pain developed in female mice. To explore the intersection between estrogen and inflammation in CNP we used a combination therapy of an estrogen receptor β (ER β) inhibitor with a sTNF/TNFR1 or general p38MAPK inhibitor. We determined both combination therapies lends therapeutic relief to females following CCI comparable to the response evaluated in male mice. These data suggest that TNFR1/p38αMAPK signaling in Nex + neurons in CNP is male-specific and lack of therapeutic efficacy following sTNF inhibition in females is due to ER β interference. These studies highlight sex-specific differences in pathways important to pain chronification and elucidate potential therapeutic strategies that would be effective in both sexes.
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Affiliation(s)
- Kathryn A Swanson
- Department of Biology, Drexel University, Papadakis Integrated Science Building, Philadelphia, PA 19104, USA
| | - Kayla L Nguyen
- Department of Anatomy and Cell Biology, The George Washington University School of Medicine and Health Sciences, Ross Hall, 2300 I (Eye) St NW, Rm.530A, Washington, D.C 20052, USA.
| | - Shruti Gupta
- Department of Anatomy and Cell Biology, The George Washington University School of Medicine and Health Sciences, Ross Hall, 2300 I (Eye) St NW, Rm.530A, Washington, D.C 20052, USA
| | - Jerome Ricard
- Department of Biology, Drexel University, Papadakis Integrated Science Building, Philadelphia, PA 19104, USA
| | - John R Bethea
- Department of Anatomy and Cell Biology, The George Washington University School of Medicine and Health Sciences, Ross Hall, 2300 I (Eye) St NW, Rm.530A, Washington, D.C 20052, USA.
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Alalami K, Goff J, Grimson H, Martin O, McDonald E, Mirza T, Mistry D, Ofodile A, Raja S, Shaker T, Sleibi D, Forget P. Does Topical Capsaicin Affect the Central Nervous System in Neuropathic Pain? A Narrative Review. Pharmaceuticals (Basel) 2024; 17:842. [PMID: 39065693 PMCID: PMC11279538 DOI: 10.3390/ph17070842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Revised: 06/21/2024] [Accepted: 06/25/2024] [Indexed: 07/28/2024] Open
Abstract
Research has been conducted investigating the neuronal pathways responsible for the generation of chronic neuropathic pain, including the components of it in conditions such as chronic post-surgical pain, phantom limb pain, and cluster headaches. Forming part of the management of such conditions, capsaicin as a molecule has proven effective. This review has investigated the central nervous system modifications exhibited in such conditions and the pharmacological mechanisms of capsaicin relevant to this. The current paradigm for explaining topical capsaicin-induced analgesia is that TRPV1-mediated calcium ion influx induces calpain, in turn causing axonal ablation and functional defunctionalisation in the PNS (Peripheral Nervous System). Demonstrated through the analysis of existing data, this review demonstrates the changes seen in the CNS (Central Nervous System) in chronic neuropathic pain, as well as some of the evidence for capsaicin modulation on the CNS. Further supporting this, the specific molecular mechanisms of capsaicin-induced analgesia will also be explored, including the action of TRPV1, as well as discussing the further need for clinical research into this area of uncertainty due to the limited specific data with suitable parameters. Further research this review identified as potentially useful in this field included fMRI (functional Magnetic Resonance Imaging) studies, though more specific observational studies of patients who have already been administered capsaicin as a current treatment may prove helpful in studying the modification of the CNS in the long term.
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Affiliation(s)
- Kareem Alalami
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Jenna Goff
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Hannah Grimson
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Oliver Martin
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Eloise McDonald
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Thonima Mirza
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Dhruvi Mistry
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Adanma Ofodile
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Sara Raja
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Tooba Shaker
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Danah Sleibi
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB24 3FX, UK; (K.A.); (D.S.)
| | - Patrice Forget
- Epidemiology Group, Institute of Applied Health Sciences, School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Polwarth Building, Foresterhill Health Campus, Aberdeen AB25 2ZN, UK
- Department of Anaesthesia, NHS Grampian, Aberdeen AB25 2ZN, UK
- Pain and Opioids after Surgery (PANDOS) Research Groups, European Society of Anaesthesiology and Intensive Care, 1000 Brussels, Belgium
- Anesthesia Critical Care, Emergency and Pain Medicine Division, 30900 Nîmes University Hospital, IMAGINE UR UM 103, Montpellier University, 30900 Nîmes, France
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Zu Y, Zhang Z, Hao Z, Jiang Z, Chen K, Wang Y, Zou C, Ge L, Yu Q, Zheng F, Wang C. Changes in brain structure and function during early aging in patients with chronic low back pain. Front Aging Neurosci 2024; 16:1356507. [PMID: 38912520 PMCID: PMC11190087 DOI: 10.3389/fnagi.2024.1356507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 05/29/2024] [Indexed: 06/25/2024] Open
Abstract
Objective To explore the structural and functional changes in cognition-related brain regions in patients with chronic low back pain (CLBP) at earlier ages, and explore the impact of the interaction between CLBP and age on the brain. Methods Seventy-six patients with CLBP were recruited and divided into "younger" age group (20-29 years, YA), "middle" age group (30-39 years, MA), and "older" age group (40-49 years, OA). All patients underwent functional magnetic resonance imaging (fMRI) as well as clinical psychological and pain-related symptoms assessments. Results Structural analysis showed that patients in OA group had lower gray matter (GM) volumes in the orbitofrontal cortex (OFC) bilaterally and the right superior frontal gyrus (SFG) compared to YA group. The resting-state brain activity analysis showed that amplitude of low-frequency fluctuation (ALFF) values in the bilateral postcentral gyrus and left ventral medial prefrontal cortex (mPFC) were significantly different in the OA group. The functional connectivity (FC) in the right ventral dorsolateral prefrontal cortex (DLPFC) and the right insula was significantly decreased in the OA group compared to the YA and MA groups. Likewise, the FC in the left caudal parahippocampal gyrus (PHG) and left inferior parietal lobule (IPL) were significantly lower in the MA and OA groups compared to the YA group. In addition, both the structural properties and the FC values of these brain regions were significantly correlated with age. Conclusion This preliminary study concludes that CLBP affects the aging process. The synergistic effects of CLBP and aging accelerate the functional and structural decline of certain areas of the brain, which not only affects pain processing, but are also may be associated with cognitive declines.
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Affiliation(s)
- Yao Zu
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Zhou Zhang
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Zengming Hao
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Zimu Jiang
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Ke Chen
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Yu Wang
- College of Rehabilitation Medicine, Gannan Medical University, Ganzhou, China
| | - Changcheng Zou
- College of Rehabilitation Medicine, Gannan Medical University, Ganzhou, China
| | - Le Ge
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Qiuhua Yu
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Fuming Zheng
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Chuhuai Wang
- Department of Rehabilitation Medicine, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
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Del Mauro G, Sevel LS, Boissoneault J, Wang Z. Divergent association between pain intensity and resting-state fMRI-based brain entropy in different age groups. J Neurosci Res 2024; 102:e25341. [PMID: 38751218 PMCID: PMC11154588 DOI: 10.1002/jnr.25341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 04/24/2024] [Accepted: 04/27/2024] [Indexed: 06/11/2024]
Abstract
Pain is a multidimensional subjective experience sustained by multiple brain regions involved in different aspects of pain experience. We used brain entropy (BEN) estimated from resting-state fMRI (rsfMRI) data to investigate the neural correlates of pain experience. BEN was estimated from rs-fMRI data provided by two datasets with different age range: the Human Connectome Project-Young Adult (HCP-YA) and the Human Connectome project-Aging (HCP-A) datasets. Retrospective assessment of experienced pain intensity was retrieved from both datasets. No main effect of pain intensity was observed. The interaction between pain and age, however, was related to increased BEN in several pain-related brain regions, reflecting greater variability of spontaneous brain activity. Dividing the sample into a young adult group (YG) and a middle age-aging group (MAG) resulted in two divergent patterns of pain-BEN association: In the YG, pain intensity was related to reduced BEN in brain regions involved in the sensory processing of pain; in the MAG, pain was associated with increased BEN in areas related to both sensory and cognitive aspects of pain experience.
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Affiliation(s)
- Gianpaolo Del Mauro
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Landrew Samuel Sevel
- Department of Anesthesiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Jeff Boissoneault
- Department of Anesthesiology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Ze Wang
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
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Haruwaka K, Ying Y, Liang Y, Umpierre AD, Yi MH, Kremen V, Chen T, Xie T, Qi F, Zhao S, Zheng J, Liu YU, Dong H, Worrell GA, Wu LJ. Microglia enhance post-anesthesia neuronal activity by shielding inhibitory synapses. Nat Neurosci 2024; 27:449-461. [PMID: 38177340 PMCID: PMC10960525 DOI: 10.1038/s41593-023-01537-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 11/29/2023] [Indexed: 01/06/2024]
Abstract
Microglia are resident immune cells of the central nervous system and play key roles in brain homeostasis. During anesthesia, microglia increase their dynamic process surveillance and interact more closely with neurons. However, the functional significance of microglial process dynamics and neuronal interaction under anesthesia is largely unknown. Using in vivo two-photon imaging in mice, we show that microglia enhance neuronal activity after the cessation of isoflurane anesthesia. Hyperactive neuron somata are contacted directly by microglial processes, which specifically colocalize with GABAergic boutons. Electron-microscopy-based synaptic reconstruction after two-photon imaging reveals that, during anesthesia, microglial processes enter into the synaptic cleft to shield GABAergic inputs. Microglial ablation or loss of microglial β2-adrenergic receptors prevents post-anesthesia neuronal hyperactivity. Our study demonstrates a previously unappreciated function of microglial process dynamics, which enable microglia to transiently boost post-anesthesia neuronal activity by physically shielding inhibitory inputs.
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Affiliation(s)
| | - Yanlu Ying
- Department of Anesthesiology, Guangzhou First People's Hospital, South China University of Technology, Guangzhou, China.
| | - Yue Liang
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
| | | | - Min-Hee Yi
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
| | - Vaclav Kremen
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
| | - Tingjun Chen
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
| | - Tao Xie
- Translational Oncology Group, Faculty of Science, School of Life Sciences, University of Technology Sydney, Sydney, New South Wales, Australia
| | - Fangfang Qi
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
| | - Shunyi Zhao
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
| | - Jiaying Zheng
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
| | - Yong U Liu
- Department of Anesthesiology, Guangzhou First People's Hospital, South China University of Technology, Guangzhou, China
| | - Hailong Dong
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China
| | | | - Long-Jun Wu
- Department of Neurology, Mayo Clinic, Rochester, MN, USA.
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA.
- Department of Immunology, Mayo Clinic, Rochester, MN, USA.
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Wei HR, Tang L, Yang XL, Chen CM, Li LX, Mao Y, Wang D, Kang F, Qun S, Zhang Z, Cao P, Jin Y. A microglial activation cascade across cortical regions underlies secondary mechanical hypersensitivity to amputation. Cell Rep 2024; 43:113804. [PMID: 38368612 DOI: 10.1016/j.celrep.2024.113804] [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: 02/28/2023] [Revised: 08/03/2023] [Accepted: 01/31/2024] [Indexed: 02/20/2024] Open
Abstract
Neural mechanisms underlying amputation-related secondary pain are unclear. Using in vivo two-photon imaging, three-dimensional reconstruction, and fiber photometry recording, we show that a microglial activation cascade from the primary somatosensory cortex of forelimb (S1FL) to the primary somatosensory cortex of hindlimb (S1HL) mediates the disinhibition and subsequent hyperexcitation of glutamatergic neurons in the S1HL (S1HLGlu), which then drives secondary mechanical hypersensitivity development in ipsilateral hindpaws of mice with forepaw amputation. Forepaw amputation induces rapid S1FL microglial activation that further activates S1HL microglia via the CCL2-CCR2 signaling pathway. Increased engulfment of GABAergic presynapses by activated microglia stimulates S1HLGlu neuronal activity, ultimately leading to secondary mechanical hypersensitivity of hindpaws. It is widely believed direct neuronal projection drives interactions between distinct brain regions to prime specific behaviors. Our study reveals microglial interactions spanning different subregions of the somatosensory cortex to drive a maladaptive neuronal response underlying secondary mechanical hypersensitivity at non-injured sites.
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Affiliation(s)
- Hong-Rui Wei
- Department of Anesthesiology, The First Affiliated Hospital of USTC, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Lan Tang
- Department of Anesthesiology, The First Affiliated Hospital of USTC, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Xin-Lu Yang
- Department of Anesthesiology, The First Affiliated Hospital of USTC, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China; Department of Anesthesiology, The First Affiliated Hospital of Wannan Medical College, Wuhu, Anhui 241000, China
| | - Chang-Mao Chen
- Department of Anesthesiology, The First Affiliated Hospital of USTC, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Le-Xian Li
- Department of Anesthesiology, The First Affiliated Hospital of USTC, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Yu Mao
- Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Hefei 230022, China
| | - Di Wang
- Department of Anesthesiology, The First Affiliated Hospital of USTC, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Fang Kang
- Department of Anesthesiology, The First Affiliated Hospital of USTC, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Sen Qun
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Zhi Zhang
- Department of Anesthesiology, The First Affiliated Hospital of USTC, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China; Center for Advanced Interdisciplinary Science and Biomedicine, Institute of Health and Medicine, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.
| | - Peng Cao
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.
| | - Yan Jin
- Stroke Center and Department of Neurology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.
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Rankin G, Chirila AM, Emanuel AJ, Zhang Z, Woolf CJ, Drugowitsch J, Ginty DD. Nerve injury disrupts temporal processing in the spinal cord dorsal horn through alterations in PV + interneurons. Cell Rep 2024; 43:113718. [PMID: 38294904 PMCID: PMC11101906 DOI: 10.1016/j.celrep.2024.113718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 11/13/2023] [Accepted: 01/11/2024] [Indexed: 02/02/2024] Open
Abstract
How mechanical allodynia following nerve injury is encoded in patterns of neural activity in the spinal cord dorsal horn (DH) remains incompletely understood. We address this in mice using the spared nerve injury model of neuropathic pain and in vivo electrophysiological recordings. Surprisingly, despite dramatic behavioral over-reactivity to mechanical stimuli following nerve injury, an overall increase in sensitivity or reactivity of DH neurons is not observed. We do, however, observe a marked decrease in correlated neural firing patterns, including the synchrony of mechanical stimulus-evoked firing, across the DH. Alterations in DH temporal firing patterns are recapitulated by silencing DH parvalbumin+ (PV+) interneurons, previously implicated in mechanical allodynia, as are allodynic pain-like behaviors. These findings reveal decorrelated DH network activity, driven by alterations in PV+ interneurons, as a prominent feature of neuropathic pain and suggest restoration of proper temporal activity as a potential therapeutic strategy to treat chronic neuropathic pain.
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Affiliation(s)
- Genelle Rankin
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Anda M Chirila
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Alan J Emanuel
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Zihe Zhang
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA; F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, MA 02115, USA
| | - Clifford J Woolf
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA; F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, MA 02115, USA
| | - Jan Drugowitsch
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA
| | - David D Ginty
- Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA; Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA.
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11
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Bak MS, Park H, Yoon H, Chung G, Shin H, Shin S, Kim TW, Lee K, Nägerl UV, Kim SJ, Kim SK. Machine learning-based evaluation of spontaneous pain and analgesics from cellular calcium signals in the mouse primary somatosensory cortex using explainable features. Front Mol Neurosci 2024; 17:1356453. [PMID: 38450042 PMCID: PMC10915002 DOI: 10.3389/fnmol.2024.1356453] [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: 12/15/2023] [Accepted: 01/29/2024] [Indexed: 03/08/2024] Open
Abstract
Introduction Pain that arises spontaneously is considered more clinically relevant than pain evoked by external stimuli. However, measuring spontaneous pain in animal models in preclinical studies is challenging due to methodological limitations. To address this issue, recently we developed a deep learning (DL) model to assess spontaneous pain using cellular calcium signals of the primary somatosensory cortex (S1) in awake head-fixed mice. However, DL operate like a "black box", where their decision-making process is not transparent and is difficult to understand, which is especially evident when our DL model classifies different states of pain based on cellular calcium signals. In this study, we introduce a novel machine learning (ML) model that utilizes features that were manually extracted from S1 calcium signals, including the dynamic changes in calcium levels and the cell-to-cell activity correlations. Method We focused on observing neural activity patterns in the primary somatosensory cortex (S1) of mice using two-photon calcium imaging after injecting a calcium indicator (GCaMP6s) into the S1 cortex neurons. We extracted features related to the ratio of up and down-regulated cells in calcium activity and the correlation level of activity between cells as input data for the ML model. The ML model was validated using a Leave-One-Subject-Out Cross-Validation approach to distinguish between non-pain, pain, and drug-induced analgesic states. Results and discussion The ML model was designed to classify data into three distinct categories: non-pain, pain, and drug-induced analgesic states. Its versatility was demonstrated by successfully classifying different states across various pain models, including inflammatory and neuropathic pain, as well as confirming its utility in identifying the analgesic effects of drugs like ketoprofen, morphine, and the efficacy of magnolin, a candidate analgesic compound. In conclusion, our ML model surpasses the limitations of previous DL approaches by leveraging manually extracted features. This not only clarifies the decision-making process of the ML model but also yields insights into neuronal activity patterns associated with pain, facilitating preclinical studies of analgesics with higher potential for clinical translation.
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Affiliation(s)
- Myeong Seong Bak
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
- Division of AI and Data Analysis, Neurogrin Inc., Seoul, Republic of Korea
| | - Haney Park
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
- Division of Preclinical R&D, Neurogrin Inc., Seoul, Republic of Korea
| | - Heera Yoon
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
- Division of Preclinical R&D, Neurogrin Inc., Seoul, Republic of Korea
| | - Geehoon Chung
- Department of Physiology, College of Korean Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Hyunjin Shin
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - Soonho Shin
- Department of Physiology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Tai Wan Kim
- Department of Korean Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - Kyungjoon Lee
- Department of East-West Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - U. Valentin Nägerl
- Interdisciplinary Institute for Neuroscience, CNRS UMR 5297 and University of Bordeaux, Bordeaux, France
| | - Sang Jeong Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Sun Kwang Kim
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
- Department of Physiology, College of Korean Medicine, Kyung Hee University, Seoul, Republic of Korea
- Department of East-West Medicine, Graduate School, Kyung Hee University, Seoul, Republic of Korea
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12
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Rao Y, Ge L, Wu J. A systematic review and coordinate-based meta-analysis of fMRI studies on acupuncture at LR 3. Front Neurosci 2024; 18:1341567. [PMID: 38348133 PMCID: PMC10859399 DOI: 10.3389/fnins.2024.1341567] [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: 11/20/2023] [Accepted: 01/03/2024] [Indexed: 02/15/2024] Open
Abstract
Objectives The acupoint LR3 (Taichong) is frequently utilized in clinical acupuncture. However, its underlying neural mechanisms remain not fully elucidated, with speculations suggesting its close association with specific brain activity patterns. Methods A comprehensive literature search was undertaken across several online databases, such as PubMed, Web of Science, Embase, Cochrane Library, CNKI (China National Knowledge Infrastructure), Wanfang Database, VIP Database, and the Chinese Biomedical Database. Two independent researchers handled the study selection, quality assessment, and data extraction processes. Using the seed-based d-mapping meta-analysis approach, we evaluated the brain regions activated by LR3 acupuncture in healthy subjects. Subsequent subgroup analysis was stratified by fMRI types, and regression analyses were performed considering the duration of acupuncture, depth of needle insertion, and needle diameter. The identified active brain regions were then intricately projected onto large-scale functional networks. Results A total of 10 studies met the criteria for inclusion, encompassing 319 healthy right-handed participants. The meta-analysis indicates that acupuncture at the LR3 activates regions such as the right postcentral gyrus, left thalamus, left middle frontal gyrus, and right superior frontal gyrus. Additionally, meta-regression analysis highlights that increased acupuncture duration correlates with progressively intensified activation of the right superior frontal gyrus. Subgroup analysis posits that variations in the type of fMRI employed might account for heterogeneity in the pooled results. Concurrently, functional network analysis identifies the primary activated regions as aligning with the Basal ganglia network, Auditory network, Left executive control network, Posterior salience network, Right executive control network, and Sensorimotor networks. Conclusion Acupuncture at the LR3 in healthy subjects selectively activates brain regions linked to pain perception, emotional processing, and linguistic functions. Extending the needle retention duration intensifies the activation of the right superior frontal gyrus. These findings enrich our comprehension of the neurobiological underpinnings of acupuncture's role in pain mitigation and emotional regulation.
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Affiliation(s)
- Yawen Rao
- The First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou, China
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13
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Rodrigues JM, Ventura C, Abreu M, Santos C, Monte J, Machado JP, Santos RV. Electro-Acupuncture Effects Measured by Functional Magnetic Resonance Imaging-A Systematic Review of Randomized Clinical Trials. Healthcare (Basel) 2023; 12:2. [PMID: 38200908 PMCID: PMC10778902 DOI: 10.3390/healthcare12010002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 12/07/2023] [Accepted: 12/15/2023] [Indexed: 01/12/2024] Open
Abstract
INTRODUCTION Electro-acupuncture, an innovative adaptation of traditional acupuncture, combines electrical stimulation with acupuncture needles to enhance therapeutic effects. While acupuncture is widely used, its biological mechanisms remain incompletely understood. Recent research has explored the neurophysiological aspects of acupuncture, particularly through functional magnetic resonance imaging (fMRI) to investigate its effects on brain activity. METHODS In this systematic review, we conducted an extensive search for randomized clinical trials examining electro-acupuncture effects measured by fMRI. We employed strict eligibility criteria, quality assessment, and data extraction. RESULTS Five studies met our inclusion criteria and were analyzed. The selected studies investigated electro-acupuncture in various medical conditions, including carpal tunnel syndrome, fibromyalgia, Crohn's disease, irritable bowel syndrome, and obesity. Notably, electro-acupuncture was found to modulate brain activity and connectivity in regions associated with pain perception, emotional regulation, and cognitive processing. These findings align with the holistic approach of traditional Chinese medicine, emphasizing the interconnectedness of body and mind. DISCUSSION In carpal tunnel syndrome, electro-acupuncture at both local and distal sites showed neurophysiological improvements, suggesting distinct neuroplasticity mechanisms. In fibromyalgia, somatosensory electro-acupuncture correlated with reduced pain severity, enhanced brain connectivity, and increased gamma-aminobutyric acid levels. For Crohn's disease, electro-acupuncture influenced the homeostatic afferent processing network, potentially mitigating gut inflammation. Electro-acupuncture for irritable bowel syndrome led to decreased activity in the anterior cingulate cortex, offering pain relief, while electro-acupuncture for obesity impacted brain regions associated with dietary inhibition and emotional regulation. CONCLUSION This systematic review provides evidence that electro-acupuncture can positively impact a range of medical conditions, possibly by modulating brain activity and connectivity. While the quality of the reviewed studies is generally good, further research with larger sample sizes and longer-term assessments is needed to better understand the mechanisms and optimize electro-acupuncture protocols for specific health conditions. The limited number of studies in this review emphasizes the need for broader investigations in this promising field. The research protocol was registered in PROSPERO (CRD42023465866).
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Affiliation(s)
- Jorge Magalhães Rodrigues
- IPTC—Research Department in Complementary Therapies, Portuguese Institute of Taiji and Qigong, 4470-765 Maia, Portugal
- ABS—Health Level Department, Atlântico Business School, 4405-604 Vila Nova de Gaia, Portugal
- CBSin—Center of BioSciences in Integrative Health, 4200-135 Porto, Portugal
- ICBAS—School of Medicine and Biomedical Sciences, University of Porto, 4050-313 Porto, Portugal
| | - Cristina Ventura
- IPTC—Research Department in Complementary Therapies, Portuguese Institute of Taiji and Qigong, 4470-765 Maia, Portugal
- ABS—Health Level Department, Atlântico Business School, 4405-604 Vila Nova de Gaia, Portugal
| | - Manuela Abreu
- IPTC—Research Department in Complementary Therapies, Portuguese Institute of Taiji and Qigong, 4470-765 Maia, Portugal
- ABS—Health Level Department, Atlântico Business School, 4405-604 Vila Nova de Gaia, Portugal
| | - Catarina Santos
- IPTC—Research Department in Complementary Therapies, Portuguese Institute of Taiji and Qigong, 4470-765 Maia, Portugal
- ABS—Health Level Department, Atlântico Business School, 4405-604 Vila Nova de Gaia, Portugal
| | - Joana Monte
- ABS—Health Level Department, Atlântico Business School, 4405-604 Vila Nova de Gaia, Portugal
| | - Jorge Pereira Machado
- CBSin—Center of BioSciences in Integrative Health, 4200-135 Porto, Portugal
- ICBAS—School of Medicine and Biomedical Sciences, University of Porto, 4050-313 Porto, Portugal
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14
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Yao D, Chen Y, Chen G. The role of pain modulation pathway and related brain regions in pain. Rev Neurosci 2023; 34:899-914. [PMID: 37288945 DOI: 10.1515/revneuro-2023-0037] [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: 03/25/2023] [Accepted: 05/18/2023] [Indexed: 06/09/2023]
Abstract
Pain is a multifaceted process that encompasses unpleasant sensory and emotional experiences. The essence of the pain process is aversion, or perceived negative emotion. Central sensitization plays a significant role in initiating and perpetuating of chronic pain. Melzack proposed the concept of the "pain matrix", in which brain regions associated with pain form an interconnected network, rather than being controlled by a singular brain region. This review aims to investigate distinct brain regions involved in pain and their interconnections. In addition, it also sheds light on the reciprocal connectivity between the ascending and descending pathways that participate in pain modulation. We review the involvement of various brain areas during pain and focus on understanding the connections among them, which can contribute to a better understanding of pain mechanisms and provide opportunities for further research on therapies for improved pain management.
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Affiliation(s)
- Dandan Yao
- Department of Anesthesiology, School of Medicine, Shaoxing University, Shaoxing, Zhejiang, China
- Department of Anesthesiology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Yeru Chen
- Department of Anesthesiology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Gang Chen
- Department of Anesthesiology, School of Medicine, Shaoxing University, Shaoxing, Zhejiang, China
- Department of Anesthesiology, Sir Run Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, 310058, China
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15
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Li Y, Jiang Z, Zuo W, Huang C, Zhao J, Liu P, Wang J, Guo J, Zhang X, Wang M, Lu Y, Hou W, Wang Q. Sexual dimorphic distribution of G protein-coupled receptor 30 in pain-related regions of the mouse brain. J Neurochem 2023. [PMID: 37924265 DOI: 10.1111/jnc.15995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 09/24/2023] [Accepted: 10/04/2023] [Indexed: 11/06/2023]
Abstract
Sex differences in pain sensitivity have contributed to the fact that medications for curing chronic pain are unsatisfactory. However, the underlying mechanism remains to be elucidated. Brain-derived estrogen participates in modulation of sex differences in pain and related emotion. G protein-coupled receptor 30 (GPR30), identified as a novel estrogen receptor with a different distribution than traditional receptors, has been proved to play a vital role in regulating pain affected by estrogen. However, the contribution of its distribution to sexually dimorphic pain-related behaviors has not been fully explored. In the current study, immunofluorescence assays were applied to mark the neurons expressing GPR30 in male and female mice (in metestrus and proestrus phase) in pain-related brain regions. The neurons that express CaMKIIα or VGAT were also labeled to observe overlap with GPR30. We found that females had more GPR30-positive (GPR30+ ) neurons in the primary somatosensory (S1) and insular cortex (IC) than males. In the lateral habenula (LHb) and the nucleus tractus solitarius (NTS), males had more GPR30+ neurons than females. Moreover, within the LHb, the expression of GPR30 varied with estrous cycle phase; females in metestrus had fewer GPR30+ neurons than those in proestrus. In addition, females had more GPR30+ neurons, which co-expressed CaMKIIα in the medial preoptic nucleus (mPOA) than males, while males had more than females in the basolateral complex of the amygdala (BLA). These findings may partly explain the different modulatory effects of GPR30 in pain and related emotional phenotypes between sexes and provide a basis for comprehension of sexual dimorphism in pain related to estrogen and GPR30, and finally provide new targets for exploiting new treatments of sex-specific pain.
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Affiliation(s)
- You Li
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Zhenhua Jiang
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
- Department of Nursing, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Wenqiang Zuo
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Chenchen Huang
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Jianshuai Zhao
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Peizheng Liu
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Jiajia Wang
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Jingzhi Guo
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Xiao Zhang
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Minghui Wang
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Yan Lu
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Wugang Hou
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Qun Wang
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi Province, China
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16
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Chen Y, Yang Y, Gong Z, Kang Y, Zhang Y, Chen H, Zeng K, Men X, Wang J, Huang Y, Wang H, Zhan S, Tan W, Wang W. Altered effective connectivity from cerebellum to motor cortex in chronic low back pain: A multivariate pattern analysis and spectral dynamic causal modeling study. Brain Res Bull 2023; 204:110794. [PMID: 37871687 DOI: 10.1016/j.brainresbull.2023.110794] [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: 04/03/2023] [Revised: 08/01/2023] [Accepted: 10/17/2023] [Indexed: 10/25/2023]
Abstract
To explore the central processing mechanism of pain perception in chronic low back pain (cLBP) using multi-voxel pattern analysis (MVPA) based on the static and dynamic fractional amplitude of low-frequency fluctuations (fALFF) analysis, and spectral dynamic causal modeling (spDCM). Thirty-two patients with cLBP and 29 matched healthy controls (HCs) for the first cohort and 24 patients with cLBP and 22 HCs for the validation cohort underwent resting-state fMRI scan. The alterations in static and dynamic fALFF were as classification features to distinguish patients with cLBP from HCs. The brain regions gotten from the MVPA results were used for further spDCM analysis. We found that the most discriminative brain regions that contributed to the classification were the right supplementary motor area (SMA.R), left paracentral lobule (PCL.L), and bilateral cerebellar Crus II. The spDCM results displayed decreased excitatory influence from the bilateral cerebellar Crus II to PCL.L in patients with cLBP compared with HCs. Moreover, the conversion of effective connectivity from the bilateral cerebellar Crus II to SMA.R from excitatory influence to inhibitive influence, and the effective connectivity strength exhibited partially mediated effects on Chinese Short Form Oswestry Disability Index Questionnaire (C-SFODI) scores. Our findings suggest that the cerebellum and its weakened or inhibited connections to the motor cortex may be one of the underlying feedback pathways for pain perception in cLBP, and partially mediate the degree of dysfunction.
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Affiliation(s)
- Yilei Chen
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yuchan Yang
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Zhigang Gong
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yingjie Kang
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yingying Zhang
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Hui Chen
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Ke Zeng
- Department of Tuina, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Xiubo Men
- Department of Tuina, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Jianwei Wang
- Department of Tuina, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yanwen Huang
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Hui Wang
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Songhua Zhan
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Wenli Tan
- Department of Radiology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Wei Wang
- Department of Tuina, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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17
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Izuno S, Yoshihara K, Hosoi M, Eto S, Hirabayashi N, Todani T, Gondo M, Hayaki C, Anno K, Hiwatashi A, Sudo N. Psychological characteristics associated with the brain volume of patients with fibromyalgia. Biopsychosoc Med 2023; 17:36. [PMID: 37875931 PMCID: PMC10594713 DOI: 10.1186/s13030-023-00293-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 10/16/2023] [Indexed: 10/26/2023] Open
Abstract
Fibromyalgia (FM) is a disease characterized by chronic widespread pain concomitant with psychiatric symptoms such as anxiety and depression. It has been reported that FM patients engage in pain catastrophizing. In this study, we investigated characteristics of the brain volume of female FM patients and the association between psychological indices and brain volume. Thirty-nine female FM patients and 25 female healthy controls (HCs) were recruited for the study, and five FM patients were excluded due to white matter lesions. The following analyses were performed: (1) T1-weighted MRI were acquired for 34 FM patients (age 41.6 ± 7.4) and 25 HCs (age 39.5 ± 7.4). SPM12 was used to compare their gray and white matter volumes. (2) Data from anxiety and depression questionnaires (State-Trait Anxiety Inventory and Hospital Anxiety and Depression Scale), the Pain Catastrophizing Scale (subscales rumination, helplessness, magnification), and MRI were acquired for 34 FM patients (age 41.6 ± 7.4). Correlation analysis was done of the psychological indices and brain volume. We found that (1) The white matter volume of the temporal pole was larger in the FM patient group than in the HC group. (2) Correlation analysis of the psychological indices and gray matter volume showed a negative correlation between trait anxiety and the amygdala. For the white matter volume, positive correlations were found between depression and the brainstem and between magnification and the postcentral gyrus. Changes in the brain volume of female FM patients may be related to anxiety, depression, and pain catastrophizing.
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Grants
- JP16K15414 Ministry of Education, Culture, Sports, Science and Technology
- JP19H03752 Ministry of Education, Culture, Sports, Science and Technology
- JP20K03417 Ministry of Education, Culture, Sports, Science and Technology
- JP19FG2001 Ministry of Health, Labour and Welfare
- JP20FC1056 Ministry of Health, Labour and Welfare
- JP19ek0610015h0003 Japan Agency for Medical Research and Development
- JP19dm0307104 Japan Agency for Medical Research and Development
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Affiliation(s)
- Satoshi Izuno
- Department of Psychosomatic Medicine, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashiku, Fukuoka, Fukuoka, 812-8582, Japan
| | - Kazufumi Yoshihara
- Department of Psychosomatic Medicine, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashiku, Fukuoka, Fukuoka, 812-8582, Japan.
| | - Masako Hosoi
- Department of Psychosomatic Medicine, Kyushu University Hospital, Fukuoka, Japan
- Multidisciplinary Pain Center, Kyushu University Hospital, Fukuoka, Japan
| | - Sanami Eto
- Department of Psychosomatic Medicine, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashiku, Fukuoka, Fukuoka, 812-8582, Japan
| | | | - Tae Todani
- Department of Psychosomatic Medicine, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashiku, Fukuoka, Fukuoka, 812-8582, Japan
| | - Motoharu Gondo
- Department of Psychosomatic Medicine, Kyushu University Hospital, Fukuoka, Japan
| | - Chie Hayaki
- Department of Psychosomatic Medicine, Kyushu Central Hospital of the Mutual Aid Association of Public School Teachers, Fukuoka, Japan
| | - Kozo Anno
- Department of Psychosomatic Medicine, Kyushu University Hospital, Fukuoka, Japan
- Multidisciplinary Pain Center, Kyushu University Hospital, Fukuoka, Japan
| | - Akio Hiwatashi
- Department of Radiology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Nobuyuki Sudo
- Department of Psychosomatic Medicine, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashiku, Fukuoka, Fukuoka, 812-8582, Japan
- Department of Psychosomatic Medicine, Kyushu University Hospital, Fukuoka, Japan
- Multidisciplinary Pain Center, Kyushu University Hospital, Fukuoka, Japan
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18
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Poesl M, Carvalho GF, Adamczyk WM, Schüßler B, Richter M, Luedtke K, Szikszay TM. Widespread Proprioceptive Acuity Impairment in Chronic Back Pain: A Cross-sectional Study. Arch Phys Med Rehabil 2023; 104:1439-1446. [PMID: 36935031 DOI: 10.1016/j.apmr.2023.02.016] [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: 01/05/2023] [Revised: 02/16/2023] [Accepted: 02/21/2023] [Indexed: 03/19/2023]
Abstract
OBJECTIVE To investigate whether proprioceptive accuracy measured with the Joint Position Sense (JPS) in patients with chronic neck and low back pain is impaired exclusively in affected areas or also in distant areas, not affected by pain. DESIGN Cross-sectional study. SETTING Interdisciplinary outpatient rehabilitation clinic for back and neck pain. PARTICIPANTS Patients with chronic neck pain (n=30), patients with chronic low back pain (n=30), and age- and sex-matched asymptomatic control subjects (n=30; N=90). INTERVENTIONS Not applicable. MAIN OUTCOME MEASURES Patients and asymptomatic control subjects completed a test procedure for the JPS of the cervical spine, lumbar spine, and ankle in a randomized order. Between group differences were analyzed with the univariate analysis of variance and associations of the JPS with clinical features using the Pearson's correlation coefficient. RESULTS Both patients with chronic neck pain (P<.001) and patients with chronic low back pain (P<.01) differed significantly from asymptomatic controls in the JPS of the cervical spine, lumbar spine and ankle joint, regardless of the painful area. No difference was shown between patient groups (P>.05). An association of the JPS with clinical characteristics, however, could not be shown. CONCLUSION These results suggest widespread impairment of proprioceptive accuracy in patients with chronic and low back pain and a role for central sensorimotor processes in musculoskeletal pain conditions.
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Affiliation(s)
| | - Gabriela F Carvalho
- Institute of Health Sciences, Department of Physiotherapy, Pain and Exercise Research Luebeck (P.E.R.L.), Universität zu Lübeck, Lübeck, Germany
| | - Waclaw M Adamczyk
- Laboratory of Pain Research, Institute of Physiotherapy and Health Sciences, The Jerzy Kukuczka Academy of Physical Education, Katowice, Poland
| | - Beate Schüßler
- Institute of Health Sciences, Department of Physiotherapy, Pain and Exercise Research Luebeck (P.E.R.L.), Universität zu Lübeck, Lübeck, Germany
| | | | - Kerstin Luedtke
- Institute of Health Sciences, Department of Physiotherapy, Pain and Exercise Research Luebeck (P.E.R.L.), Universität zu Lübeck, Lübeck, Germany; Center of Brain, Behavior and Metabolism (CBBM), Universität zu Lübeck, Lübeck, Germany
| | - Tibor M Szikszay
- Institute of Health Sciences, Department of Physiotherapy, Pain and Exercise Research Luebeck (P.E.R.L.), Universität zu Lübeck, Lübeck, Germany; Center of Brain, Behavior and Metabolism (CBBM), Universität zu Lübeck, Lübeck, Germany.
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19
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Wong KR, Wright DK, Sgro M, Salberg S, Bain J, Li C, Sun M, McDonald SJ, Mychasiuk R, Brady RD, Shultz SR. Persistent Changes in Mechanical Nociception in Rats With Traumatic Brain Injury Involving Polytrauma. THE JOURNAL OF PAIN 2023; 24:1383-1395. [PMID: 36958460 DOI: 10.1016/j.jpain.2023.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 03/12/2023] [Accepted: 03/15/2023] [Indexed: 03/25/2023]
Abstract
Traumatic brain injury (TBI) survivors often experience debilitating consequences. Due to the high impact nature of TBI, patients often experience concomitant peripheral injuries (ie, polytrauma). A common, yet often overlooked, comorbidity of TBI is chronic pain. Therefore, this study investigated how common concomitant peripheral injuries (ie, femoral fracture and muscle crush) can affect long-term behavioral and structural TBI outcomes with a particular focus on nociception. Rats were randomly assigned to 1 of 4 groups: polytrauma (POLY; ie, fracture + muscle crush + TBI), peripheral injury (PERI; ie, fracture + muscle crush + sham TBI), TBI (ie, sham fracture + sham muscle crush + TBI), and sham-injured (SHAM; ie, sham fracture + sham muscle crush + sham TBI). Rats underwent behavioral testing at 3-, 6-, and 11-weeks postinjury, and were then euthanized for postmortem magnetic resonance imaging (MRI). POLY rats had a persisting increase in pain sensitivity compared to all groups on the von Frey test. MRI revealed that POLY rats also had abnormalities in the cortical and subcortical brain structures involved in nociceptive processing. These findings have important implications and provide a foundation for future studies to determine the underlying mechanisms and potential treatment strategies for chronic pain in TBI survivors. PERSPECTIVE: Rats with TBI and concomitant peripheral trauma displayed chronic nociceptive pain and MRI images also revealed damaged brain structures/pathways that are involved in chronic pain development. This study highlights the importance of polytrauma and the affected brain regions for developing chronic pain.
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Affiliation(s)
- Ker Rui Wong
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia
| | - David K Wright
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia
| | - Marissa Sgro
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia
| | - Sabrina Salberg
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia
| | - Jesse Bain
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia
| | - Crystal Li
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia
| | - Mujun Sun
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia
| | - Stuart J McDonald
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia; Department of Physiology, Anatomy and Microbiology, School of Life Sciences, La Trobe University, Bundoora, VIC, Australia
| | - Richelle Mychasiuk
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia
| | - Rhys D Brady
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia; Department of Medicine, The University of Melbourne, Parkville, VIC, Australia
| | - Sandy R Shultz
- Department of Neuroscience, Monash University, Melbourne, VIC, Australia; Department of Medicine, The University of Melbourne, Parkville, VIC, Australia; Department of Nursing, Health and Human Services, Vancouver Island University, Nanaimo, BC, Canada.
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20
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Díaz-Mohedo E, González-Roldán G, Muñoz-Gámez I, Padilla-Romero V, Castro-Martín E, Cabrera-Martos I, Sánchez-García C. Implicit Motor Imagery for Chronic Pelvic Pain: A Cross-Sectional Case-Control Study. J Clin Med 2023; 12:4738. [PMID: 37510853 PMCID: PMC10380828 DOI: 10.3390/jcm12144738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/27/2023] [Accepted: 07/13/2023] [Indexed: 07/30/2023] Open
Abstract
Implicit motor imagery (IMI), with an image laterality discrimination (LD) task, has been proposed as a useful therapeutic tool to restore body schema in patients with chronic pelvic pain (CPP). The aim of this study was to analyse the existence of differences between patients with CPP and healthy individuals in order to justify the use of IMI. An observational, cross-sectional study with non-probabilistic sampling was designed as a one-to-one matched case-control study. Through a web link designed for this purpose, a total of 40 abdominoperineal images were shown to 130 participants during the laterality task. Outcome measures were pain intensity (visual analogue scale, VAS), accuracy, response time (RT), and CPPQ-Mohedo score (Chronic Pelvic Pain Questionnaire-Mohedo). This was an observational, cross-sectional study with a total of 64 CPP patients and 66 healthy individuals. The comparative analysis between groups revealed significant differences in accuracy, CPPQ-Mohedo and VAS (p < 0.001), but not in RT; in patients with CPP, accuracy was correlated with a lower CPPQ-Mohedo score and RT and, the greater the pain intensity, the higher the CPPQ-Mohedo score and RT, and the lower the accuracy. In the LD task, the patients with CPP made more mistakes than the healthy individuals. IMI could be a useful and complementary tool in the therapeutic approach for patients with CPP.
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Affiliation(s)
- Esther Díaz-Mohedo
- Department of Physiotherapy, Faculty of Health Sciences, University of Malaga, Avda. Arquitecto Francisco Peñalosa, s/n, 29071 Málaga, Spain
| | | | | | | | - Eduardo Castro-Martín
- Department of Physiotherapy, Faculty of Health Sciences, University of Granada, 18016 Granada, Spain
| | - Irene Cabrera-Martos
- Department of Physiotherapy, Faculty of Health Sciences, University of Granada, 18016 Granada, Spain
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21
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Rankin G, Chirila AM, Emanuel AJ, Zhang Z, Woolf CJ, Drugowitsch J, Ginty DD. Nerve injury disrupts temporal processing in the spinal cord dorsal horn through alterations in PV + interneurons. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.20.533541. [PMID: 36993199 PMCID: PMC10055222 DOI: 10.1101/2023.03.20.533541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
How mechanical allodynia following nerve injury is encoded in patterns of neural activity in the spinal cord dorsal horn (DH) is not known. We addressed this using the spared nerve injury model of neuropathic pain and in vivo electrophysiological recordings. Surprisingly, despite dramatic behavioral over-reactivity to mechanical stimuli following nerve injury, an overall increase in sensitivity or reactivity of DH neurons was not observed. We did, however, observe a marked decrease in correlated neural firing patterns, including the synchrony of mechanical stimulus-evoked firing, across the DH. Alterations in DH temporal firing patterns were recapitulated by silencing DH parvalbumin + (PV + ) inhibitory interneurons, previously implicated in mechanical allodynia, as were allodynic pain-like behaviors in mice. These findings reveal decorrelated DH network activity, driven by alterations in PV + interneurons, as a prominent feature of neuropathic pain, and suggest that restoration of proper temporal activity is a potential treatment for chronic neuropathic pain.
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22
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Chen C, Sun L, Adler A, Zhou H, Zhang L, Zhang L, Deng J, Bai Y, Zhang J, Yang G, Gan WB, Tang P. Synchronized activity of sensory neurons initiates cortical synchrony in a model of neuropathic pain. Nat Commun 2023; 14:689. [PMID: 36755026 PMCID: PMC9908980 DOI: 10.1038/s41467-023-36093-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 01/17/2023] [Indexed: 02/10/2023] Open
Abstract
Increased low frequency cortical oscillations are observed in people with neuropathic pain, but the cause of such elevated cortical oscillations and their impact on pain development remain unclear. By imaging neuronal activity in a spared nerve injury (SNI) mouse model of neuropathic pain, we show that neurons in dorsal root ganglia (DRG) and somatosensory cortex (S1) exhibit synchronized activity after peripheral nerve injury. Notably, synchronized activity of DRG neurons occurs within hours after injury and 1-2 days before increased cortical oscillations. This DRG synchrony is initiated by axotomized neurons and mediated by local purinergic signaling at the site of nerve injury. We further show that synchronized DRG activity after SNI is responsible for increasing low frequency cortical oscillations and synaptic remodeling in S1, as well as for inducing animals' pain-like behaviors. In naive mice, enhancing the synchrony, not the level, of DRG neuronal activity causes synaptic changes in S1 and pain-like behaviors similar to SNI mice. Taken together, these results reveal the critical role of synchronized DRG neuronal activity in increasing cortical plasticity and oscillations in a neuropathic pain model. These findings also suggest the potential importance of detection and suppression of elevated cortical oscillations in neuropathic pain states.
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Affiliation(s)
- Chao Chen
- Department of Orthopaedics, Peking 301 Hospital, Beijing, China
- Department of Hand Surgery, Shenzhen People's Hospital, Second Clinical Medicine College of Jinan University, First Affiliated Hospital of Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Linlin Sun
- Department of Anesthesiology, Columbia University Medical Center, New York, NY, USA
- Department of Neurobiology, School of Basic Medical Sciences, Key Laboratory for Neuroscience, Ministry of Education/National Health Commission of China, Neuroscience Research Institute, Peking University, Beijing, China
| | - Avital Adler
- Skirball Institute, Department of Neuroscience and Physiology, New York University School of Medicine, New York, NY, USA
| | - Hang Zhou
- Department of Anesthesiology, Columbia University Medical Center, New York, NY, USA
| | - Licheng Zhang
- Department of Orthopaedics, Peking 301 Hospital, Beijing, China
| | - Lihai Zhang
- Department of Orthopaedics, Peking 301 Hospital, Beijing, China
| | - Junhao Deng
- Department of Orthopaedics, Peking 301 Hospital, Beijing, China
| | - Yang Bai
- Institute of Neurological and Psychiatric Disorders, Shenzhen Bay Laboratory, Shenzhen, Guangdong, China
| | - Jinhui Zhang
- Department of Orthopaedics, the Affiliated Southeast Hospital of Xiamen University, Zhangzhou 175 Hospital, Zhangzhou, Fujian, China
| | - Guang Yang
- Department of Anesthesiology, Columbia University Medical Center, New York, NY, USA.
| | - Wen-Biao Gan
- Institute of Neurological and Psychiatric Disorders, Shenzhen Bay Laboratory, Shenzhen, Guangdong, China.
| | - Peifu Tang
- Department of Orthopaedics, Peking 301 Hospital, Beijing, China.
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23
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Li T, Gao Y, He M, Gui Z, Zhao B, Cao Y, Chen T, Zhu J, Wang J, Zhong Q, Zhang Z. P2X7 receptor-activated microglia in cortex is critical for sleep disorder under neuropathic pain. Front Neurosci 2023; 17:1095718. [PMID: 36816134 PMCID: PMC9936193 DOI: 10.3389/fnins.2023.1095718] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 01/16/2023] [Indexed: 02/05/2023] Open
Abstract
Neuropathic pain (NP) is associated with sleep disturbances, which may substantially influence the quality of life. Clinical and animal studies demonstrated that neurotransmitter is one of the main contributors to cause sleep disturbances induced by NP. Recently, it was reported that P2X7 receptors (P2X7R) are widely expressed in microglia, which serves crucial role in neuronal activity in the pain and sleep-awake cycle. In this study, we adopted the chronic constriction injury (CCI) model to establish the progress of chronic pain and investigated whether P2X7R of microglia in cortex played a critical role in sleep disturbance induced by NP. At electroencephalogram (EEG) level, sleep disturbance was observed in mice treated with CCI as they exhibited mechanical and thermal hypersensitivity, and inhibition of P2X7R ameliorated these changes. We showed a dramatic high level of P2X7R and Iba-1 co-expression in the cortical region, and the inhibition of P2X7R also adversely affected it. Furthermore, the power of LFPs in ventral posterior nucleus (VP) and primary somatosensory cortex (S1) which changed in the CCI group was adverse after the inhibition of P2X7R. Furthermore, inhibition of P2X7R also decreased the VP-S1 coherence which increased in CCI group. Nuclear magnetic resonance demonstrated inhibition of P2X7R decreased glutamate (Glu) levels in thalamic and cortical regions which were significantly increased in the CCI mice. Our findings provide evidence that NP has a critical effect on neuronal activity linked to sleep and may built up a new target for the development of sleep disturbances under chronic pain conditions.
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Affiliation(s)
- Tingting Li
- Department of Anesthesiology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Yunling Gao
- Xiangyang Central Hospital, Institute of Neuroscience and Brain Diseases, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Mengying He
- Department of Anesthesiology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China,Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, China
| | - Zhu Gui
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, China,University of Chinese Academy of Sciences, Beijing, China
| | - Bingchu Zhao
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, China,School of Computer Science, Wuhan University, Wuhan, Hubei, China
| | - Yue Cao
- Department of Anesthesiology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Ting Chen
- Department of Anesthesiology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China
| | - Jinpiao Zhu
- Department of Anesthesiology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China,Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, China
| | - Jie Wang
- Xiangyang Central Hospital, Institute of Neuroscience and Brain Diseases, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei, China,Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, China,University of Chinese Academy of Sciences, Beijing, China
| | - Qi Zhong
- Department of Anesthesiology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China,*Correspondence: Qi Zhong,
| | - Zongze Zhang
- Department of Anesthesiology, Zhongnan Hospital, Wuhan University, Wuhan, Hubei, China,Zongze Zhang,
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24
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Travassos C, Sayal A, Direito B, Pereira J, Sousa T, Castelo-Branco M. Assessing MR-compatibility of somatosensory stimulation devices: A systematic review on testing methodologies. Front Neurosci 2023; 17:1071749. [PMID: 36777636 PMCID: PMC9909190 DOI: 10.3389/fnins.2023.1071749] [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: 10/16/2022] [Accepted: 01/03/2023] [Indexed: 01/27/2023] Open
Abstract
Functional magnetic resonance imaging (fMRI) has been extensively used as a tool to map the brain processes related to somatosensory stimulation. This mapping includes the localization of task-related brain activation and the characterization of brain activity dynamics and neural circuitries related to the processing of somatosensory information. However, the magnetic resonance (MR) environment presents unique challenges regarding participant and equipment safety and compatibility. This study aims to systematically review and analyze the state-of-the-art methodologies to assess the safety and compatibility of somatosensory stimulation devices in the MR environment. A literature search, following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement guidelines, was performed in PubMed, Scopus, and Web of Science to find original research on the development and testing of devices for somatosensory stimulation in the MR environment. Nineteen records that complied with the inclusion and eligibility criteria were considered. The findings are discussed in the context of the existing international standards available for the safety and compatibility assessment of devices intended to be used in the MR environment. In sum, the results provided evidence for a lack of uniformity in the applied testing methodologies, as well as an in-depth presentation of the testing methodologies and results. Lastly, we suggest an assessment methodology (safety, compatibility, performance, and user acceptability) that can be applied to devices intended to be used in the MR environment. Systematic review registration https://www.crd.york.ac.uk/prospero/, identifier CRD42021257838.
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Affiliation(s)
- Carolina Travassos
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), University of Coimbra (UC), Coimbra, Portugal
- Siemens Healthineers AG, Lisbon, Portugal
| | - Alexandre Sayal
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), University of Coimbra (UC), Coimbra, Portugal
- Siemens Healthineers AG, Lisbon, Portugal
| | - Bruno Direito
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), University of Coimbra (UC), Coimbra, Portugal
- Institute for Nuclear Sciences Applied to Health (ICNAS), University of Coimbra (UC), Coimbra, Portugal
- Instituto do Ambiente, Tecnologia e Vida (IATV), Coimbra, Portugal
| | - João Pereira
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), University of Coimbra (UC), Coimbra, Portugal
| | - Teresa Sousa
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), University of Coimbra (UC), Coimbra, Portugal
- Institute for Nuclear Sciences Applied to Health (ICNAS), University of Coimbra (UC), Coimbra, Portugal
| | - Miguel Castelo-Branco
- Coimbra Institute for Biomedical Imaging and Translational Research (CIBIT), University of Coimbra (UC), Coimbra, Portugal
- Institute for Nuclear Sciences Applied to Health (ICNAS), University of Coimbra (UC), Coimbra, Portugal
- Faculty of Medicine (FMUC), University of Coimbra (UC), Coimbra, Portugal
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25
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Tekmyster G, Jonely H, Lee DW, Myerson J, Avery M, Moradian M, Desai MJ. Physical Therapy Considerations and Recommendations for Patients Following Spinal Cord Stimulator Implant Surgery. Neuromodulation 2023; 26:260-269. [PMID: 33819381 DOI: 10.1111/ner.13391] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 03/01/2021] [Accepted: 03/08/2021] [Indexed: 01/11/2023]
Abstract
OBJECTIVES Spinal cord stimulation (SCS) is an established therapy option in interventional pain medicine. Recent advances in technology have allowed for greater compliance with treatment and improved efficacy in pain control. This article was proposed to fill the gap in the literature addressing this specific patient population and to facilitate further research. Even though there is a lack of consensus among societies and experts on exact parameters of physical therapy (PT) considerations and postoperative limitations in patients with SCS, we propose rehabilitative care for this population should be standardized. As the number of patients with SCS implants grow, it is vital to understand how to appropriately approach patients with implantable devices when additional treatments such as PT are prescribed. MATERIALS AND METHODS A literature search was performed on the use of PT following SCS implantation. Presently, there is no literature to date which addresses the use of PT in this patient population. The lack of data is the largest hurdle in the creation of formal SCS therapy guidelines. The authors therefore proposed recommendations for rehabilitation based upon a detailed understanding of SCS hardware alongside well-studied physiotherapy concepts. RESULTS Considerations when initiating PT in the SCS patient population should include: 1) biomechanics and quality of SCS output; 2) therapeutic exercise and spinal manipulation in association with risk for lead migration and fracture; 3) the application of therapeutic modalities and risk for injury to the patient and/or damage to the SCS componentry; and 4) integration of a biopsychosocial, person-centered approach. CONCLUSIONS PT treatment protocol in patients with a recently implanted SCS device should be person-centered addressing individual needs, values, and goals. Further research is needed to fully appreciate the impact of an interprofessional approach to management of SCS patients, particularly following stimulator implantation.
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Affiliation(s)
- Gene Tekmyster
- Keck Medicine of USC, Orthopaedic Surgery, Los Angeles, CA, USA
| | - Holly Jonely
- International Spine Pain & Performance Center, Washington, DC, USA
| | - David W Lee
- Fullerton Orthopedic Surgery Medical Group, Fullerton, CA, USA.
| | - Jason Myerson
- Performance Physical Therapy & Wellness, Westport, CT, USA
| | - Melinda Avery
- International Spine Pain & Performance Center, Washington, DC, USA
| | | | - Mehul J Desai
- International Spine Pain & Performance Center, Washington, DC, USA
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26
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Cao B, Scherrer G, Chen L. Spinal cord retinoic acid receptor signaling gates mechanical hypersensitivity in neuropathic pain. Neuron 2022; 110:4108-4124.e6. [PMID: 36223767 PMCID: PMC9789181 DOI: 10.1016/j.neuron.2022.09.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 08/27/2022] [Accepted: 09/22/2022] [Indexed: 02/08/2023]
Abstract
Central sensitization caused by spinal disinhibition is a key mechanism of mechanical allodynia in neuropathic pain. However, the molecular mechanisms underlying spinal disinhibition after nerve injury remain unclear. Here, we show in mice that spared nerve injury (SNI), which induces mechanical hypersensitivity and neuropathic pain, triggers homeostatic reduction of inhibitory outputs from dorsal horn parvalbumin-positive (PV+) interneurons onto both primary afferent terminals and excitatory interneurons. The reduction in inhibitory outputs drives hyperactivation of the spinal cord nociceptive pathway, causing mechanical hypersensitivity. We identified the retinoic acid receptor RARα, a central regulator of homeostatic plasticity, as the key molecular mediator for this synaptic disinhibition. Deletion of RARα in spinal PV+ neurons or application of an RARα antagonist in the spinal cord prevented the development of SNI-induced mechanical hypersensitivity. Our results identify RARα as a crucial molecular effector for neuropathic pain and a potential target for its treatment.
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Affiliation(s)
- Bing Cao
- Department of Neurosurgery, Wu Tsai Neuroscience Institute, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Gregory Scherrer
- Department of Cell Biology and Physiology, UNC Neuroscience Center, Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Lu Chen
- Department of Neurosurgery, Wu Tsai Neuroscience Institute, Stanford University School of Medicine, Stanford, CA 94305, USA.
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27
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Jin Y, Mao Y, Chen D, Tai Y, Hu R, Yang CL, Zhou J, Chen L, Liu X, Gu E, Jia C, Zhang Z, Tao W. Thalamocortical circuits drive remifentanil-induced postoperative hyperalgesia. J Clin Invest 2022; 132:158742. [PMID: 36519547 PMCID: PMC9754001 DOI: 10.1172/jci158742] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 10/18/2022] [Indexed: 12/15/2022] Open
Abstract
Remifentanil-induced hyperalgesia (RIH) is a severe but common postoperative clinical problem with elusive underlying neural mechanisms. Here, we discovered that glutamatergic neurons in the thalamic ventral posterolateral nucleus (VPLGlu) exhibited significantly elevated burst firing accompanied by upregulation of Cav3.1 T-type calcium channel expression and function in RIH model mice. In addition, we identified a glutamatergic neuronal thalamocortical circuit in the VPL projecting to hindlimb primary somatosensory cortex glutamatergic neurons (S1HLGlu) that mediated RIH. In vivo calcium imaging and multi-tetrode recordings revealed heightened S1HLGlu neuronal activity during RIH. Moreover, preoperative suppression of Cav3.1-dependent burst firing in VPLGlu neurons or chemogenetic inhibition of VPLGlu neuronal terminals in the S1HL abolished the increased S1HLGlu neuronal excitability while alleviating RIH. Our findings suggest that remifentanil induces postoperative hyperalgesia by upregulating T-type calcium channel-dependent burst firing in VPLGlu neurons to activate S1HLGlu neurons, thus revealing an ion channel-mediated neural circuit basis for RIH that can guide analgesic development.
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Affiliation(s)
- Yan Jin
- Stroke Center and Department of Neurology and,Department of Anesthesiology and Pain Medicine, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, USTC, Hefei, China
| | - Yu Mao
- Stroke Center and Department of Neurology and,Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Danyang Chen
- Department of Anesthesiology and Pain Medicine, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, USTC, Hefei, China
| | - Yingju Tai
- Department of Anesthesiology and Pain Medicine, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, USTC, Hefei, China
| | - Rui Hu
- Department of Anesthesiology, The Third Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Chen-Ling Yang
- Department of Physiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Jing Zhou
- Department of head, neck, and breast Surgery, Western district of the First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, USTC, Hefei, China
| | - Lijian Chen
- Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Xuesheng Liu
- Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Erwei Gu
- Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Chunhui Jia
- Department of Anesthesiology and Pain Medicine, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, USTC, Hefei, China
| | - Zhi Zhang
- Department of Anesthesiology and Pain Medicine, The First Affiliated Hospital of University of Science and Technology of China (USTC), Division of Life Sciences and Medicine, USTC, Hefei, China
| | - Wenjuan Tao
- Stroke Center and Department of Neurology and,Department of Physiology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
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28
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Chen YL, Feng XL, Cheung CW, Liu JA. Mode of action of astrocytes in pain: From the spinal cord to the brain. Prog Neurobiol 2022; 219:102365. [DOI: 10.1016/j.pneurobio.2022.102365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 09/09/2022] [Accepted: 10/07/2022] [Indexed: 11/06/2022]
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Kong Y, Kuss M, Shi Y, Fang F, Xue W, Shi W, Liu Y, Zhang C, Zhong P, Duan B. Exercise facilitates regeneration after severe nerve transection and further modulates neural plasticity. Brain Behav Immun Health 2022; 26:100556. [PMID: 36405423 PMCID: PMC9673108 DOI: 10.1016/j.bbih.2022.100556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 11/03/2022] [Accepted: 11/11/2022] [Indexed: 11/13/2022] Open
Abstract
Patients with severe traumatic peripheral nerve injury (PNI) always suffer from incomplete recovery and poor functional outcome. Physical exercise-based rehabilitation, as a non-invasive interventional strategy, has been widely acknowledged to improve PNI recovery by promoting nerve regeneration and relieving pain. However, effects of exercise on chronic plastic changes following severe traumatic PNIs have been limitedly discussed. In this study, we created a long-gap sciatic nerve transection followed by autograft bridging in rats and tested the therapeutic functions of treadmill running with low intensity and late initiation. We demonstrated that treadmill running effectively facilitated nerve regeneration and prevented muscle atrophy and thus improved sensorimotor functions and walking performance. Furthermore, exercise could reduce inflammation at the injured nerve as well as prevent the overexpression of TRPV1, a pain sensor, in primary afferent sensory neurons. In the central nervous system, we found that PNI induced transcriptive changes at the ipsilateral lumber spinal dorsal horn, and exercise could reverse the differential expression for genes involved in the Notch signaling pathway. In addition, through neural imaging techniques, we found volumetric, microstructural, metabolite, and neuronal activity changes in supraspinal regions of interest (i.e., somatosensory cortex, motor cortex, hippocampus, etc.) after the PNI, some of which could be reversed through treadmill running. In summary, treadmill running with late initiation could promote recovery from long-gap nerve transection, and while it could reverse maladaptive plasticity after the PNI, exercise may also ameliorate comorbidities, such as chronic pain, mental depression, and anxiety in the long term.
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Affiliation(s)
- Yunfan Kong
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Mitchell Kuss
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Yu Shi
- School of Biological Sciences, University of Nebraska Lincoln, Lincoln, NE, 68588, USA
| | - Fang Fang
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Wen Xue
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Wen Shi
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Yutong Liu
- Department of Radiology, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Chi Zhang
- School of Biological Sciences, University of Nebraska Lincoln, Lincoln, NE, 68588, USA
- Center for Plant Science Innovation, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Peng Zhong
- Department of Neurological Sciences, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Bin Duan
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Department of Surgery, College of Medicine, University of Nebraska Medical Center, Omaha, NE, 68198, USA
- Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
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Sun R, Zhang SY, Cheng X, Zhang P, Qiao PG, Li GJ. Changes in sensory-related brain networks of patients with moyamoya disease with limb paresthesia: A resting-state fMRI-based functional connectivity analysis. Neuroimage Clin 2022; 36:103267. [PMID: 36510412 PMCID: PMC9668639 DOI: 10.1016/j.nicl.2022.103267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 10/25/2022] [Accepted: 11/11/2022] [Indexed: 11/15/2022]
Abstract
This study's aim was to investigate functional brain connectivity changes among patients with moyamoya disease (MMD) with limb paresthesia, using functional connectivity analysis based on resting-state functional magnetic resonance imaging (rs-fMRI). A total of 181 patients with MMD were enrolled, including 57 with left limb paresthesia (MLP group), 61 with right limb paresthesia (MRP group), and 63 without paresthesia (MWP group). Encephaloduroarteriosynangiosis (EDAS) was performed in 20 of the 57 patients with left limb paresthesia and 15 of the 61 patients with right limb paresthesia. Twenty-nine age- and sex-matched healthy controls (HC group) were recruited during the same period. All participants underwent rs-fMRI examination, and the patients treated with EDAS were re-examined 3-4 months after the surgery. After data preprocessing, we selected Brodmann area 3 on each side of the brain as the seed region to construct a functional connectivity network of the whole brain, and then we analyzed the differences in functional connectivity between the HC group, MWP group, MLP group, and MRP group. The functional connectivity of Brodmann area 3 (on either side) with the ipsilateral frontal (superior frontal gyrus, middle frontal gyrus, and inferior frontal gyrus) and parietal (supramarginal gyrus, angular gyrus, and superior parietal lobule) cortices was increased among patients with MMD. The functional connectivity enhancement in these brain regions was broader and greater in patients with contralateral limb paresthesia than in patients without paresthesia, and the regions with functional connectivity changes were roughly distributed symmetrically among the MLP group and the MRP group. There were no changes 3-4 months after EDAS in the increased functional connectivity between the frontal and parietal cortices and Brodmann area 3. Limb paresthesia in patients with MMD may be driven by abnormal functional connectivity in the frontal and parietal cortices. Functional changes in associated brain regions may be a target for evaluating the severity of MMD and its response to treatment.
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Affiliation(s)
- Rujing Sun
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Shi-Yu Zhang
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Xu Cheng
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Peng Zhang
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Peng-Gang Qiao
- Department of Radiology, Beijing Friendship Hospital, Capital Medical University, Beijing, China,Department of Radiology, Affiliated Hospital of Academy of Military Medical Sciences, Beijing, China,Corresponding authors at: Department of Radiology, Beijing Friendship Hospital, Capital Medical University, 95 YongAn Road, Beijing 100050, China, (P.-G. Qiao). Department of Radiology, Affiliated hospital of Academy of Military Medical Sciences, #8 Fengtai dong street, Fengtai district, Beijing 100071, China, (G.-J. Li).
| | - Gong-Jie Li
- Department of Radiology, Affiliated Hospital of Academy of Military Medical Sciences, Beijing, China,Corresponding authors at: Department of Radiology, Beijing Friendship Hospital, Capital Medical University, 95 YongAn Road, Beijing 100050, China, (P.-G. Qiao). Department of Radiology, Affiliated hospital of Academy of Military Medical Sciences, #8 Fengtai dong street, Fengtai district, Beijing 100071, China, (G.-J. Li).
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31
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Chen Y, Xing X, Dai W, Tian L, Dong Z, Yu S. Brain regions involved in fractional amplitude of low-frequency fluctuation in cluster headache patients: a resting-state functional MRI study. BMC Neurol 2022; 22:336. [PMID: 36071405 PMCID: PMC9450424 DOI: 10.1186/s12883-022-02863-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 08/29/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND We used resting-state functional magnetic resonance imaging (RS-fMRI) to assess the possible pathogenic role of fALFF in CH. A limited number of studies have reported on fractional amplitude of low-frequency fluctuation (fALFF) in cluster headache (CH). METHODS RS-fMRI scans of 23 patients with CH were obtained (11with left-sided headache and 12 with right-sided headache), along with scans of 23 age- and sex-matched normal controls. The RS-fMRI data were analyzed to explore abnormal brain activity in the left CH and right CH patients during the non-painful state in one cluster period. fALFF was compared between patients and controls, and correlation analysis between the regional mean fALFF values and clinical characteristics was performed. RESULTS A decrease in fALFF was detected in the left cerebellum, left lentiform nucleus, left frontal lobe, left anterior cingulate, and right postcentral gyrus in the left CH group compared to the controls, while a decrease of fALFF was detected in the right cerebellum, right cingulate gyrus, right superior parietal lobule, right inferior parietal lobule, right postcentral gyrus, and left precuneus in the right CH group. No patient had a region with increased fALFF. A moderate correlation was observed between some regional mean fALFF values and the clinical characteristics. CONCLUSIONS We deduced that dysfunction in multiple brain areas is involved in the non-painful state of CH during a cluster period.
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Affiliation(s)
- Yun Chen
- Department of Neurology, Chinese PLA General Hospital; International headache center, Chinese PLA General Hospital, Beijing, China.,Chinese PLA Medical School, Beijing, 100853, China.,Department of Neurology, Peking University Shougang Hospital, Beijing, 100144, China
| | - Xinbo Xing
- Department of Radiology, Fourth Medical Center of Chinese PLA General Hospital, Beijing, 100048, China
| | - Wei Dai
- Department of Neurology, Chinese PLA General Hospital; International headache center, Chinese PLA General Hospital, Beijing, China.,Chinese PLA Medical School, Beijing, 100853, China
| | - Lixia Tian
- School of Computer and Information Technology, Beijing Jiaotong University, Beijing, 100044, China
| | - Zhao Dong
- Department of Neurology, Chinese PLA General Hospital; International headache center, Chinese PLA General Hospital, Beijing, China.
| | - Shengyuan Yu
- Department of Neurology, Chinese PLA General Hospital; International headache center, Chinese PLA General Hospital, Beijing, China.
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32
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Yoon H, Bak MS, Kim SH, Lee JH, Chung G, Kim SJ, Kim SK. Development of a spontaneous pain indicator based on brain cellular calcium using deep learning. EXPERIMENTAL & MOLECULAR MEDICINE 2022; 54:1179-1187. [PMID: 35982300 PMCID: PMC9385425 DOI: 10.1038/s12276-022-00828-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 05/04/2022] [Accepted: 05/23/2022] [Indexed: 12/04/2022]
Abstract
Chronic pain remains an intractable condition in millions of patients worldwide. Spontaneous ongoing pain is a major clinical problem of chronic pain and is extremely challenging to diagnose and treat compared to stimulus-evoked pain. Although extensive efforts have been made in preclinical studies, there still exists a mismatch in pain type between the animal model and humans (i.e., evoked vs. spontaneous), which obstructs the translation of knowledge from preclinical animal models into objective diagnosis and effective new treatments. Here, we developed a deep learning algorithm, designated AI-bRNN (Average training, Individual test-bidirectional Recurrent Neural Network), to detect spontaneous pain information from brain cellular Ca2+ activity recorded by two-photon microscopy imaging in awake, head-fixed mice. AI-bRNN robustly determines the intensity and time points of spontaneous pain even in chronic pain models and evaluates the efficacy of analgesics in real time. Furthermore, AI-bRNN can be applied to various cell types (neurons and glia), brain areas (cerebral cortex and cerebellum) and forms of somatosensory input (itch and pain), proving its versatile performance. These results suggest that our approach offers a clinically relevant, quantitative, real-time preclinical evaluation platform for pain medicine, thereby accelerating the development of new methods for diagnosing and treating human patients with chronic pain. A microscopy technique coupled with an artificial intelligence (AI) platform could help researchers discover new types of pain-relief medicines. A team from South Korea led by Sun Kwang Kim of Kyung Hee University and Sang Jeong Kim of Seoul National University created a machine-learning algorithm that converts calcium signaling data in the brain, as estimated via imaging on genetically engineered mice, into a measurement of pain intensity. The researchers applied the technique to several mouse models of chronic pain and showed that it accurately captured the analgesic effects of known painkillers. They also extended the system to multiple brain regions, cell types and another brain-controlled sensory process, itch. The researchers propose using the AI-based tool to evaluate candidate anti-pain and anti-itch medicines ahead of human trials.
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Affiliation(s)
- Heera Yoon
- Department of Physiology, College of Korean Medicine, Kyung Hee University, Seoul, 02447, Republic of Korea.,Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Myeong Seong Bak
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Seung Ha Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea
| | - Ji Hwan Lee
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Geehoon Chung
- Department of Physiology, College of Korean Medicine, Kyung Hee University, Seoul, 02447, Republic of Korea
| | - Sang Jeong Kim
- Department of Physiology, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea. .,Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, 03080, Republic of Korea.
| | - Sun Kwang Kim
- Department of Physiology, College of Korean Medicine, Kyung Hee University, Seoul, 02447, Republic of Korea. .,Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul, 02447, Republic of Korea.
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33
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Altered Brain Activity and Effective Connectivity within the Nonsensory Cortex during Stimulation of a Latent Myofascial Trigger Point. Neural Plast 2022; 2022:4416672. [PMID: 35992300 PMCID: PMC9391196 DOI: 10.1155/2022/4416672] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/27/2022] [Accepted: 07/18/2022] [Indexed: 12/02/2022] Open
Abstract
Myofascial trigger point (MTrP), an iconic characteristic of myofascial pain syndrome (MPS), can induce cerebral cortex changes including altered cortical excitability and connectivity. The corresponding characteristically reactive cortex is still ambiguous. Seventeen participants with latent MTrPs underwent functional near-infrared spectroscopy (fNIRS) to collect cerebral oxygenation hemoglobin (Δ[oxy-Hb]) signals. The Δ[oxy-Hb] signals of the left/right prefrontal cortex (L/R PFC), left/right motor cortex (L/R MC), and left/right occipital lobe (L/R OL) of the subjects were measured using functional near-infrared spectroscopy (fNIRS) in the resting state, nonmyofascial trigger point (NMTrP), state and MTrP state. The data investigated the latent MTrP-induced changes in brain activity and effective connectivity (EC) within the nonsensory cortex. The parameter wavelet amplitude (WA) was used to describe cortical activation, EC to show brain network connectivity, and main coupling direction (mCD) to exhibit the dominant connectivity direction in different frequency bands. An increasing trend of WA and a decreasing trend of EC values were observed in the PFC. The interregional mCD was primarily shifted from a unidirectional to bidirectional connection, especially from PFC to MC or OL, when responding to manual stimulation during the MTrP state compared with resting state and NMTrP state in the intervals III, IV, and V. This study demonstrates that the nonsensory cortex PFC, MC, and OL can participate in the cortical reactions induced by stimulation of a latent MTrP. Additionally, the PFC shows nonnegligible higher activation and weakened regulation than other brain regions. Thus, the PFC may be responsible for the central cortical regulation of a latent MTrP. This trial is registered with ChiCTR2100048433.
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Limb Laterality Discrimination, Evoked Sensations and Somatosensory Behavior in Fibromyalgia Syndrome: A Cross-Sectional Study. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12157495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The main objective of this study was to assess the status of body schema using limb laterality discrimination tasks and pain measurement variables of patients with FMS compared to healthy subjects. The secondary aim was to analyze the relationships between laterality discrimination with respect to somatosensory variables. Thirty female patients with FMS (with a mean age of 52.43 ± 11.82 years) and thirty healthy women (with a mean age of 47.93 ± 5.92 years) were recruited. The main outcome measures were laterality discrimination, referral of evoked sensations, pressure pain threshold and conditioned pain modulation. The main analysis showed that patients with FMS have a longer reaction time for laterality discrimination in hands (hands—20 images, t = 4.044, p < 0.0001, d = 1.04; hands—50 images t = 4.012, p < 0.0001, d = 1.31; feet—20 images t = 2.982, p < 0.01, d = 0.76; feet—50 images, t = 2.159, p < 0.05, d = 0.55). With regard the secondary analysis, patients with FM have higher mechanical hyperalgesia (t = −9.550; p < 0.0001, d = 2.51) and decreased response to conditioned pain modulation compared with healthy subjects (t = 15.519; p < 0.0001, d = 4.17). A positive correlation was found in patients with FMS between greater laterality discrimination ability and better function of conditioned pain modulation (hands r = 0.676, p < 0.0001; feet r = 0.485, p < 0.01). In conclusion, patients with FMS have a longer reaction time and lower accuracy for laterality discrimination, increased mechanical hyperalgesia and decreased conditioned pain modulation compared to healthy subjects. Finally, it seems that there is a positive correlation between greater laterality discrimination ability and better conditioned pain modulation function.
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35
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Scrambler Therapy for Chronic Pain after Burns and Its Effect on the Cerebral Pain Network: A Prospective, Double-Blinded, Randomized Controlled Trial. J Clin Med 2022; 11:jcm11154255. [PMID: 35893347 PMCID: PMC9332864 DOI: 10.3390/jcm11154255] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 07/16/2022] [Accepted: 07/19/2022] [Indexed: 02/05/2023] Open
Abstract
Chronic pain is common after burn injuries, and post-burn neuropathic pain is the most important complication that is difficult to treat. Scrambler therapy (ST) is a non-invasive modality that uses patient-specific electrocutaneous nerve stimulation and is an effective treatment for many chronic pain disorders. This study used magnetic resonance imaging (MRI) to evaluate the pain network-related mechanisms that underlie the clinical effect of ST in patients with chronic burn-related pain. This prospective, double-blinded, randomized controlled trial (ClinicalTrials.gov: NCT03865693) enrolled 43 patients who were experiencing chronic neuropathic pain after unilateral burn injuries. The patients had moderate or greater chronic pain (a visual analogue scale (VAS) score of ≥5), despite treatment using gabapentin and other physical modalities, and were randomized 1:1 to receive real or sham ST sessions. The ST was performed using the MC5-A Calmare device for ten 45 min sessions (Monday to Friday for 2 weeks). Baseline and post-treatment parameters were evaluated subjectively using the VAS score for pain and the Hamilton Depression Rating Scale; MRI was performed to identify objective central nervous system changes by measuring the cerebral blood volume (CBV). After 10 ST sessions (two weeks), the treatment group exhibited a significant reduction in pain relative to the sham group. Furthermore, relative to the pre-ST findings, the post-ST MRI evaluations revealed significantly decreased CBV in the orbito-frontal gyrus, middle frontal gyrus, superior frontal gyrus, and gyrus rectus. In addition, the CBV was increased in the precentral gyrus and postcentral gyrus of the hemisphere associated with the burned limb in the ST group, as compared with the CBV of the sham group. Thus, a clinical effect from ST on burn pain was observed after 2 weeks, and a potential mechanism for the treatment effect was identified. These findings suggest that ST may be an alternative strategy for managing chronic pain in burn patients.
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Szabo E, Chang YC, Shulman J, Sieberg CB, Sethna NF, Borsook D, Holmes SA, Lebel AA. Alterations in the structure and function of the brain in adolescents with new daily persistent headache: A pilot
MRI
study. Headache 2022; 62:858-869. [DOI: 10.1111/head.14360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 05/29/2022] [Accepted: 06/03/2022] [Indexed: 12/14/2022]
Affiliation(s)
- Edina Szabo
- Pain and Affective Neuroscience Center, Department of Anesthesiology, Critical Care, and Pain Medicine Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
- Biobehavioral Pediatric Pain Lab, Department of Psychiatry and Behavioral Sciences Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
| | | | - Julie Shulman
- Department of Physical Therapy and Occupational Therapy Boston Children's Hospital Boston Massachusetts USA
| | - Christine B. Sieberg
- Pain and Affective Neuroscience Center, Department of Anesthesiology, Critical Care, and Pain Medicine Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
- Biobehavioral Pediatric Pain Lab, Department of Psychiatry and Behavioral Sciences Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
- Department of Psychiatry Harvard Medical School Boston Massachusetts USA
| | - Navil F. Sethna
- Department of Anesthesiology, Critical Care, and Pain Medicine Boston Children's Hospital Boston Massachusetts USA
| | - David Borsook
- Department of Psychiatry Massachusetts General Hospital Boston Massachusetts USA
- Department of Radiology Massachusetts General Hospital Boston Massachusetts USA
- Department of Anesthesiology Harvard Medical School Boston Massachusetts USA
| | - Scott A. Holmes
- Pain and Affective Neuroscience Center, Department of Anesthesiology, Critical Care, and Pain Medicine Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
- Pediatric Pain Pathway Lab, Department of Anesthesiology, Critical Care, and Pain Medicine Boston Children's Hospital, Harvard Medical School Boston Massachusetts USA
| | - Alyssa A. Lebel
- Department of Anesthesiology, Critical Care, and Pain Medicine Boston Children's Hospital Boston Massachusetts USA
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Gloeckner CD, Nocon JC, Lim HH. Topographic and widespread auditory modulation of the somatosensory cortex: potential for bimodal sound and body stimulation for pain treatment. J Neural Eng 2022; 19. [PMID: 35671702 DOI: 10.1088/1741-2552/ac7665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 06/07/2022] [Indexed: 11/11/2022]
Abstract
OBJECTIVE There has been growing interest in understanding multisensory integration in the cortex through activation of multiple sensory and motor pathways to treat brain disorders, such as tinnitus or essential tremors. For tinnitus, previous studies show that combined sound and body stimulation can modulate the auditory pathway and lead to significant improvements in tinnitus symptoms. Considering that tinnitus is a type of chronic auditory pain, bimodal stimulation could potentially alter activity in the somatosensory pathway relevant for treating chronic pain. As an initial step towards that goal, we mapped and characterized neuromodulation effects in the somatosensory cortex (SC) in response to sound and/or electrical stimulation of the body. APPROACH We first mapped the topographic organization of activity across the SC of ketamine-anesthetized guinea pigs through electrical stimulation of different body locations using subcutaneous needle electrodes or with broadband acoustic stimulation. We then characterized how neural activity in different parts of the SC could be facilitated or suppressed with bimodal stimulation. MAIN RESULTS The topography in the SC of guinea pigs in response to electrical stimulation of the body aligns consistently to that shown in previous rodent studies. Interestingly, auditory broadband noise stimulation primarily excited SC areas that typically respond to stimulation of lower body locations. Although there was only a small subset of SC locations that were excited by acoustic stimulation alone, all SC recording sites could be altered (facilitated or suppressed) with bimodal stimulation. Furthermore, specific regions of the SC could be modulated by stimulating an appropriate body region combined with broadband noise. SIGNIFICANCE These findings show that bimodal stimulation can excite or modulate firing across a widespread yet targeted population of SC neurons. This approach may provide a non-invasive method for altering or disrupting abnormal firing patterns within certain parts of the SC for chronic pain treatment.
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Affiliation(s)
- Cory D Gloeckner
- University of Minnesota Duluth, 1305 Ordean Court, Duluth, Minnesota, 55812, UNITED STATES
| | - Jian C Nocon
- Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, Massachusetts, 02215, UNITED STATES
| | - Hubert H Lim
- Department of Biomedical Engineering, University of Minnesota, 7-105 Hasselmo Hall, 312 Church Street SE, Minneapolis, MN 55455, USA, Minneapolis, Minnesota, 55455, UNITED STATES
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Aberrant Spontaneous Brain Activity in Coronary Heart Disease Using Fractional Amplitude of Low-Frequency Fluctuations: A Preliminary Resting-State Functional MRI Study. DISEASE MARKERS 2022; 2022:2501886. [PMID: 35692880 PMCID: PMC9187430 DOI: 10.1155/2022/2501886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 04/14/2022] [Accepted: 05/17/2022] [Indexed: 11/18/2022]
Abstract
Objective This study is aimed at exploring the spontaneous brain activity changes by measuring the fractional amplitude of low-frequency fluctuations (fALFF) and their relationship with clinical characteristics in patients with coronary heart disease (CHD). Methods Coronary heart disease patients (n = 25) and age, gender, and education level-matched control subjects (controls, n = 35) were included. The grey matter volume (GMV) and fALFF values were calculated to assess the difference in brain structure and function between the two groups, respectively. Correlation analyses between the fALFF values and clinical characteristics were further assessed in CHD patients. In addition, receiver operating characteristic (ROC) curves were conducted to access the diagnostic ability of the fALFF method. Results There was no significant difference in GMV between the CHD and control groups. Compared with the control group, patients with CHD showed significantly decreased fALFF in the left precentral/postcentral gyrus and increased fALFF in the right inferior cerebellum. Patients with a history of myocardial infarction (MI) showed significantly decreased fALFF values of the right inferior cerebellum than patients without MI. There was no significant correlation between the fALFF values in specific brain regions and disease duration. Furthermore, the ROC curves of abnormal brain regions showed the perfect accuracy of the fALFF value in distinguishing between CHD patients and controls. Conclusion CHD demonstrated aberrant neural activity in specific brain regions mainly related to sensorimotor networks and pain processing, which may contribute to understanding the underlying neurological mechanism of CHD.
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Zhang L, Wang R, Chen Y, Yang P, Bai T, Song J, Hou X. EphrinB2/ephB2 activation facilitates colonic synaptic potentiation and plasticity contributing to long-term visceral hypersensitivity in irritable bowel syndrome. Life Sci 2022; 295:120419. [PMID: 35183555 DOI: 10.1016/j.lfs.2022.120419] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 02/13/2022] [Accepted: 02/14/2022] [Indexed: 12/11/2022]
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40
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Yan K, Shi WQ, Su T, Liao XL, Wu SN, Li QY, Yu J, Shu HY, Zhang LJ, Pan YC, Shao Y. Brain Activity Changes in Slow 5 and Slow 4 Frequencies in Patients With Optic Neuritis: A Resting State Functional MRI Study. Front Neurol 2022; 13:823919. [PMID: 35265028 PMCID: PMC8900534 DOI: 10.3389/fneur.2022.823919] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 01/13/2022] [Indexed: 11/13/2022] Open
Abstract
Objective We used the amplitude of low-frequency fluctuation (ALFF) method to investigate spontaneous brain activity in patients with optic neuritis (ON) in specific frequency bands. Data and Methods A sample of 21 patients with ON (13 female and eight male) and 21 healthy controls (HCs) underwent functional magnetic resonance imaging (fMRI) scans in the resting state. We analyzed the ALFF values at different frequencies (slow-4 band: 0.027–0.073 Hz; slow-5 band: 0.01–0.027 Hz) in ON patients and HCs. Results In the slow-4 frequency range, compared with HCs, ON patients had apparently lower ALFF in the insula and the whack precuneus. In the slow-5 frequency range, ON patients showed significantly increased ALFF in the left parietal inferior and the left postcentral. Conclusion Our results suggest that ON may be involved in abnormal brain function and can provide a basis for clinical research.
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Affiliation(s)
- Kai Yan
- Department of Radiology, Hangzhou TCM Hospital Affiliated to Zhejiang Chinese Medical University, Hangzhou, China
| | - Wen-Qing Shi
- Department of Ophthalmology, Jiangxi Centre of National Clinical Ophthalmology Institute, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Ting Su
- Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, United States
| | - Xu-Lin Liao
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Shi-Nan Wu
- Department of Ophthalmology, Jiangxi Centre of National Clinical Ophthalmology Institute, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Qiu-Yu Li
- Department of Ophthalmology, Jiangxi Centre of National Clinical Ophthalmology Institute, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Jing Yu
- Department of Acupuncture and Moxibustion, Hangzhou TCM Hospital Affiliated to Zhejiang Chinese Medical University, Hangzhou, China
| | - Hui-Ye Shu
- Department of Ophthalmology, Jiangxi Centre of National Clinical Ophthalmology Institute, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Li-Juan Zhang
- Department of Ophthalmology, Jiangxi Centre of National Clinical Ophthalmology Institute, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Yi-Cong Pan
- Department of Ophthalmology, Jiangxi Centre of National Clinical Ophthalmology Institute, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Yi Shao
- Department of Ophthalmology, Jiangxi Centre of National Clinical Ophthalmology Institute, The First Affiliated Hospital of Nanchang University, Nanchang, China
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Pondelis NJ, Moulton EA. Supraspinal Mechanisms Underlying Ocular Pain. Front Med (Lausanne) 2022; 8:768649. [PMID: 35211480 PMCID: PMC8862711 DOI: 10.3389/fmed.2021.768649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 12/27/2021] [Indexed: 12/04/2022] Open
Abstract
Supraspinal mechanisms of pain are increasingly understood to underlie neuropathic ocular conditions previously thought to be exclusively peripheral in nature. Isolating individual causes of centralized chronic conditions and differentiating them is critical to understanding the mechanisms underlying neuropathic eye pain and ultimately its treatment. Though few functional imaging studies have focused on the eye as an end-organ for the transduction of noxious stimuli, the brain networks related to pain processing have been extensively studied with functional neuroimaging over the past 20 years. This article will review the supraspinal mechanisms that underlie pain as they relate to the eye.
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Affiliation(s)
- Nicholas J Pondelis
- Brain and Eye Pain Imaging Lab, Pain and Affective Neuroscience Center, Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, United States
| | - Eric A Moulton
- Brain and Eye Pain Imaging Lab, Pain and Affective Neuroscience Center, Department of Anesthesiology, Critical Care and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, United States.,Department of Ophthalmology, Boston Children's Hospital, Harvard Medical School, Boston, MA, United States
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Wei X, Shi G, Tu J, Zhou H, Duan Y, Lee CK, Wang X, Liu C. Structural and Functional Asymmetry in Precentral and Postcentral Gyrus in Patients With Unilateral Chronic Shoulder Pain. Front Neurol 2022; 13:792695. [PMID: 35250808 PMCID: PMC8892006 DOI: 10.3389/fneur.2022.792695] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Accepted: 01/13/2022] [Indexed: 12/25/2022] Open
Abstract
Objective The purpose of this study was to explore the structural and functional asymmetry of precentral and postcentral gyrus in patients with unilateral chronic shoulder pain (CSP) utilizing MRI. Patients and Methods We collected structural and resting-state functional MRI (rs-fMRI) data in 22 left-sided, 15 patients with right-sided CSP, and 24 healthy controls (HCs). Here, we performed the structural asymmetry and seed-based functional connectivity (FC) analyses. We extracted regional cortical thickness and surface area measurements from T1-weighted MRI images, using asymmetry indexes (AIs) to assess asymmetries. We used Data Processing and Analysis for Brain Imaging software for seed-based FC analysis and selected unilateral-precentral and postcentral as the regions of interest. Then, we performed group comparisons of the neuroimaging metrics, and also explored the relationships between brain asymmetry and clinical variables. Results We found significant differences in surface area AIs of the precentral among three groups, the AI values were negatively correlated with the visual analog scale score and positively correlated with Constant–Murley scores (CMS) in the left-sided CSP group. Further, FC of left postcentral with cingulate gyrus and left paracentral lobule showed significant group differences; FC of right postcentral with left caudate, left paracentral, and left postcentral were different among groups; FC of right precentral with the cingulate gyrus, precuneus, and left paracentral revealed significant group differences. Besides, there was a positive correlation between right precentral-cingulate gyrus FC and CMS in the right-sided CSP group. Conclusion Surface area and FC patterns asymmetry exist in precentral and postcentral gyrus in patients with unilateral CSP. Asymmetry trend is associated with pain severity and shoulder joint function impairment. Brain structural and functional asymmetry may be an important indicator for understanding the potential mechanism of chronic pain.
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Affiliation(s)
- Xiaoya Wei
- International Acupuncture and Moxibustion Innovation Institute, School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Guangxia Shi
- International Acupuncture and Moxibustion Innovation Institute, School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Jianfeng Tu
- International Acupuncture and Moxibustion Innovation Institute, School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Hang Zhou
- International Acupuncture and Moxibustion Innovation Institute, School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Yanshan Duan
- International Acupuncture and Moxibustion Innovation Institute, School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Chin Kai Lee
- International Acupuncture and Moxibustion Innovation Institute, School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
| | - Xu Wang
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
- Xu Wang
| | - Cunzhi Liu
- International Acupuncture and Moxibustion Innovation Institute, School of Acupuncture-Moxibustion and Tuina, Beijing University of Chinese Medicine, Beijing, China
- *Correspondence: Cunzhi Liu
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Sieberg CB, Karunakaran KD, Kussman B, Borsook D. Preventing Pediatric Chronic Postsurgical Pain: Time for Increased Rigor. Can J Pain 2022; 6:73-84. [PMID: 35528039 PMCID: PMC9067470 DOI: 10.1080/24740527.2021.2019576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Chronic postsurgical pain (CPSP) results from a cascade of events in the peripheral and central nervous systems following surgery. Several clinical predictors, including the prior pain state, premorbid psychological state (e.g., anxiety, catastrophizing), intraoperative surgical load (establishment of peripheral and central sensitization), and acute postoperative pain management, may contribute to the patient’s risk of developing CPSP. However, research on the neurobiological and biobehavioral mechanisms contributing to pediatric CPSP and effective preemptive/treatment strategies are still lacking. Here we evaluate the perisurgical process by identifying key problems and propose potential solutions for the pre-, intra-, and postoperative pain states to both prevent and manage the transition of acute to chronic pain. We propose an eight-step process involving preemptive and preventative analgesia, behavioral interventions, and the use of biomarkers (brain-based, inflammatory, or genetic) to facilitate timely evaluation and treatment of premorbid psychological factors, ongoing surgical pain, and postoperative pain to provide an overall improved outcome. By achieving this, we can begin to establish personalized precision medicine for children and adolescents presenting to surgery and subsequent treatment selection.
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Affiliation(s)
- Christine B. Sieberg
- Biobehavioral Pediatric Pain Lab, Department of Psychiatry & Behavioral Sciences, Boston Children’s Hospital, Boston, MA USA
- Pain and Affective Neuroscience Center, Department of, Department of Anesthesiology, Critical Care, and Pain Medicine, Boston Children’s Hospital, Boston, MA USA
- Department of Psychiatry, Harvard Medical School, Boston, MA USA
| | - Keerthana Deepti Karunakaran
- Biobehavioral Pediatric Pain Lab, Department of Psychiatry & Behavioral Sciences, Boston Children’s Hospital, Boston, MA USA
- Pain and Affective Neuroscience Center, Department of, Department of Anesthesiology, Critical Care, and Pain Medicine, Boston Children’s Hospital, Boston, MA USA
| | - Barry Kussman
- Department of Anesthesiology, Critical Care, & Pain Medicine, Boston Children’s Hospital, Boston, MA USA
- Department of Anesthesiology, Harvard Medical School, Boston, MA USA
| | - David Borsook
- Department of Anesthesiology, Harvard Medical School, Boston, MA USA
- Department of Psychiatry and Radiology, Massachusetts General Hospital, Hospital, Harvard Medical School, Boston, USA
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Green S, Karunakaran KD, Labadie R, Kussman B, Mizrahi-Arnaud A, Morad AG, Berry D, Zurakowski D, Micheli L, Peng K, Borsook D. fNIRS brain measures of ongoing nociception during surgical incisions under anesthesia. NEUROPHOTONICS 2022; 9:015002. [PMID: 35111876 PMCID: PMC8794294 DOI: 10.1117/1.nph.9.1.015002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 12/10/2021] [Indexed: 06/14/2023]
Abstract
Significance: Functional near-infrared spectroscopy (fNIRS) has evaluated pain in awake and anesthetized states. Aim: We evaluated fNIRS signals under general anesthesia in patients undergoing knee surgery for anterior cruciate ligament repair. Approach: Patients were split into groups: those with regional nerve block (NB) and those without (non-NB). Continuous fNIRS measures came from three regions: the primary somatosensory cortex (S1), known to be involved in evaluation of nociception, the lateral prefrontal cortex (BA9), and the polar frontal cortex (BA10), both involved in higher cortical functions (such as cognition and emotion). Results: Our results show three significant differences in fNIRS signals to incision procedures between groups: (1) NB compared with non-NB was associated with a greater net positive hemodynamic response to pain procedures in S1; (2) dynamic correlation between the prefrontal cortex (PreFC) and S1 within 1 min of painful procedures are anticorrelated in NB while positively correlated in non-NB; and (3) hemodynamic measures of activation were similar at two separate time points during surgery (i.e., first and last incisions) in PreFC and S1 but showed significant differences in their overlap. Comparing pain levels immediately after surgery and during discharge from postoperative care revealed no significant differences in the pain levels between NB and non-NB. Conclusion: Our data suggest multiple pain events that occur during surgery using devised algorithms could potentially give a measure of "pain load." This may allow for evaluation of central sensitization (i.e., a heightened state of the nervous system where noxious and non-noxious stimuli is perceived as painful) to postoperative pain levels and the resulting analgesic consumption. This evaluation could potentially predict postsurgical chronic neuropathic pain.
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Affiliation(s)
- Stephen Green
- Boston Children’s Hospital, Harvard Medical School, The Center for Pain and the Brain, Department of Anesthesiology, Critical Care and Pain Medicine, Boston, Massachusetts, United States
| | - Keerthana Deepti Karunakaran
- Boston Children’s Hospital, Harvard Medical School, The Center for Pain and the Brain, Department of Anesthesiology, Critical Care and Pain Medicine, Boston, Massachusetts, United States
| | - Robert Labadie
- Boston Children’s Hospital, Harvard Medical School, The Center for Pain and the Brain, Department of Anesthesiology, Critical Care and Pain Medicine, Boston, Massachusetts, United States
| | - Barry Kussman
- Boston Children’s Hospital, Harvard Medical School, Division of Cardiac Anesthesia, Department of Anesthesiology, Critical Care and Pain Medicine, Boston, Massachusetts, United States
| | - Arielle Mizrahi-Arnaud
- Boston Children’s Hospital, Harvard Medical School, Division of Perioperative Anesthesia, Department of Anesthesiology, Critical Care and Pain Medicine, Boston, Massachusetts, United States
| | - Andrea Gomez Morad
- Boston Children’s Hospital, Harvard Medical School, Division of Perioperative Anesthesia, Department of Anesthesiology, Critical Care and Pain Medicine, Boston, Massachusetts, United States
| | - Delany Berry
- Boston Children’s Hospital, Harvard Medical School, The Center for Pain and the Brain, Department of Anesthesiology, Critical Care and Pain Medicine, Boston, Massachusetts, United States
| | - David Zurakowski
- Boston Children’s Hospital, Harvard Medical School, Division of Biostatistics, Department of Anesthesiology, Critical Care and Pain Medicine, Boston, Massachusetts, United States
| | - Lyle Micheli
- Boston Children’s Hospital, Harvard Medical School, Sports Medicine Division, Department of Orthopedic Surgery, Boston, Massachusetts, United States
| | - Ke Peng
- Université de Montréal, Département en Neuroscience, Centre de Recherche du CHUM, Montréal, Quebec, Canada
| | - David Borsook
- Massachusetts General Hospital, Harvard Medical School, Departments of Psychiatry and Radiology, Boston, Massachusetts, United States
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Faraj MM, Lipanski NM, Morales A, Goldberg E, Bluth MH, Marusak HA, Greenwald MK. A Virtual Reality Meditative Intervention Modulates Pain and the Pain Neuromatrix in Patients with Opioid Use Disorder. PAIN MEDICINE (MALDEN, MASS.) 2021; 22:2739-2753. [PMID: 33956146 DOI: 10.1093/pm/pnab162] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Standard of care for opioid use disorder (OUD) includes medication and counseling. However, there is an unmet need for complementary approaches to treat OUD patients coping with pain; furthermore, few studies have probed neurobiological features of pain or its management during OUD treatment. This preliminary study examines neurobiological and behavioral effects of a virtual reality-based meditative intervention in patients undergoing methadone maintenance treatment (MMT). DESIGN Prospective, non-blinded, single-arm, 12-week intervention with standardized assessments. SETTING Academic research laboratory affiliated with an on-site MMT clinic. METHODS Fifteen (11 female) MMT patients completed a virtual reality, therapist-guided meditative intervention that included breathing and relaxation exercisessessions were scheduled twice weekly. Assessments included functional magnetic resonance imaging (fMRI) of pain neuromatrix activation and connectivity (pre- and post-intervention), saliva cortisol and C-reactive protein (CRP) at baseline and weeks 4, 8 and 12; and self-reported pain and affective symptoms before and after each intervention session. RESULTS After each intervention session (relative to pre-session), ratings of pain, opioid craving, anxiety and depression (but not anger) decreased. Saliva cortisol (but not CRP) levels decreased from pre- to post-session. From pre- to post-intervention fMRI assessments, pain task-related left postcentral gyrus (PCG) activation decreased. At baseline, PCG showed positive connectivity with other regions of the pain neuromatrix, but this pattern changed post-intervention. CONCLUSIONS These preliminary findings demonstrate feasibility, therapeutic promise, and brain basis of a meditative intervention for OUD patients undergoing MMT.
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Affiliation(s)
| | - Nina M Lipanski
- Department of Biological Sciences, University of California, San Diego
| | - Austin Morales
- Department of Psychiatry and Behavioral Neurosciences, Wayne State University
| | - Elimelech Goldberg
- School of Medicine, Wayne State University, Detroit, Michigan
- Kids Kicking Cancer
| | - Martin H Bluth
- School of Medicine, Wayne State University, Detroit, Michigan
- Kids Kicking Cancer
- Maimonides Medical Center, Brooklyn, New York, USA
| | - Hilary A Marusak
- Department of Psychiatry and Behavioral Neurosciences, Wayne State University
- Merrill Palmer Skillman Institute for Child and Family Development, Wayne State University
| | - Mark K Greenwald
- Department of Psychiatry and Behavioral Neurosciences, Wayne State University
- Department of Pharmacy Practice, Wayne State University
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46
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Mu D, Sun YG. Circuit Mechanisms of Itch in the Brain. J Invest Dermatol 2021; 142:23-30. [PMID: 34662562 DOI: 10.1016/j.jid.2021.09.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 08/21/2021] [Accepted: 09/21/2021] [Indexed: 12/12/2022]
Abstract
Itch is an unpleasant somatic sensation with the desire to scratch, and it consists of sensory, affective, and motivational components. Acute itch serves as a critical protective mechanism because an itch-evoked scratching response will help to remove harmful substances invading the skin. Recently, exciting progress has been made in deciphering the mechanisms of itch at both the peripheral nervous system and the CNS levels. Key neuronal subtypes and circuits have been revealed for ascending transmission and the descending modulation of itch. In this review, we mainly summarize the current understanding of the central circuit mechanisms of itch in the brain.
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Affiliation(s)
- Di Mu
- Department of Anesthesiology, Shanghai General Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yan-Gang Sun
- Institute of Neuroscience, State Key Laboratory of Neuroscience, Center for Excellence in Brain Science and Intelligence Technology (CEBSIT), Chinese Academy of Sciences, Shanghai, China; Shanghai Center for Brain Science and Brain-Inspired Intelligence Technology, Shanghai, China.
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47
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Pedersini P, Gobbo M, Bishop MD, Arendt-Nielsen L, Villafañe JH. Functional and structural neuroplastic changes related to sensitization proxies in patients with Osteoarthritis: a systematic review. PAIN MEDICINE 2021; 23:488-498. [PMID: 34633466 DOI: 10.1093/pm/pnab301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 09/08/2021] [Accepted: 10/06/2021] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Several reports in literature have identified sensitization as a possible basis for the enhanced pain reactions associated with Osteoarthritis (OA). The aim of this current systematic review is to summarize functional and structural brain changes associated with surrogate sensitization parameters assessed in patients with OA-related pain. DESIGN Systematic review. SUBJECTS Patients with OA related pain. METHODS A literature search was conducted systematically in MEDLINE, CINAHL, EMBASE databases for human studies up to December 2019. Articles were included if they assessed brain imaging and senzitisation parameters (quantitative sensory testing and questionnaires) in adults with OA related pain. Methodological quality was assessed using the Methodological Index for Non-Randomized Studies (MINORS) score. RESULTS Five studies reporting on 138 patients were included in this review. The MINORS scale yielded mean scores of 8.5/16 and 12.3/24, for the cohort and case-control studies respectively. Four low-quality studies suggest a greater pain matrix activation associated with clinical measures of sensitization in patients with OA, while another study underlined the presence of structural changes (reduced gray matter volume) in the cortical areas involved in the nociceptive processing possible also related to sensitization. CONCLUSION This review shows conflicting evidence for structural and functional neuroplastic brain changes related to sensitization proxies in patients with OA.
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Affiliation(s)
- P Pedersini
- IRCCS Fondazione Don Carlo Gnocchi, Milan, Italy
| | - M Gobbo
- Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy
| | - M D Bishop
- Department of Physical Therapy, University of Florida, USA
| | - L Arendt-Nielsen
- Center for Neuroplasticity and Pain (CNAP), SMI, Department of Health Science and Technology, School of Medicine, Aalborg University, Aalborg, Denmark
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Virtuoso A, Colangelo AM, Korai SA, Izzo S, Todisco A, Giovannoni R, Lavitrano M, Papa M, Cirillo G. Inhibition of plasminogen/plasmin system retrieves endogenous nerve growth factor and adaptive spinal synaptic plasticity following peripheral nerve injury. Neurochem Int 2021; 148:105113. [PMID: 34171416 DOI: 10.1016/j.neuint.2021.105113] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 05/20/2021] [Accepted: 06/20/2021] [Indexed: 11/17/2022]
Abstract
Dysfunctions of the neuronal-glial crosstalk and/or impaired signaling of neurotrophic factors represent key features of the maladaptive changes in the central nervous system (CNS) in neuroinflammatory as neurodegenerative disorders. Tissue plasminogen activator (tPA)/plasminogen (PA)/plasmin system has been involved in either process of maturation and degradation of nerve growth factor (NGF), highlighting multiple potential targets for new therapeutic strategies. We here investigated the role of intrathecal (i.t.) delivery of neuroserpin (NS), an endogenous inhibitor of plasminogen activators, on neuropathic behavior and maladaptive synaptic plasticity in the rat spinal cord following spared nerve injury (SNI) of the sciatic nerve. We demonstrated that SNI reduced spinal NGF expression, induced spinal reactive gliosis, altering the expression of glial and neuronal glutamate and GABA transporters, reduced glutathione (GSH) levels and is associated to neuropathic behavior. Beside the increase of NGF expression, i.t. NS administration reduced reactive gliosis, restored synaptic homeostasis, GSH levels and reduced neuropathic behavior. Our results hereby highlight the essential role of tPA/PA system in the synaptic homeostasis and mechanisms of maladaptive plasticity, sustaining the beneficial effects of NGF-based approach in neurological disorders.
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Affiliation(s)
- Assunta Virtuoso
- Division of Human Anatomy, Laboratory of Morphology of Neuronal Networks, Department of Mental and Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli, Naples, Italy
| | - Anna Maria Colangelo
- Laboratory of Neuroscience "R. Levi-Montalcini", Dept. of Biotechnology and Biosciences, University of Milano-Bicocca, Milano, Italy; SYSBIO Centre of Systems Biology ISBE.ITALY, University of Milano-Bicocca, Milano, Italy
| | - Sohaib Ali Korai
- Division of Human Anatomy, Laboratory of Morphology of Neuronal Networks, Department of Mental and Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli, Naples, Italy
| | - Sara Izzo
- Division of Human Anatomy, Laboratory of Morphology of Neuronal Networks, Department of Mental and Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli, Naples, Italy
| | - Antonio Todisco
- Division of Human Anatomy, Laboratory of Morphology of Neuronal Networks, Department of Mental and Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli, Naples, Italy
| | | | | | - Michele Papa
- Division of Human Anatomy, Laboratory of Morphology of Neuronal Networks, Department of Mental and Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli, Naples, Italy; SYSBIO Centre of Systems Biology ISBE.ITALY, University of Milano-Bicocca, Milano, Italy.
| | - Giovanni Cirillo
- Division of Human Anatomy, Laboratory of Morphology of Neuronal Networks, Department of Mental and Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli, Naples, Italy.
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Huang L, Jin J, Chen K, You S, Zhang H, Sideris A, Norcini M, Recio-Pinto E, Wang J, Gan WB, Yang G. BDNF produced by cerebral microglia promotes cortical plasticity and pain hypersensitivity after peripheral nerve injury. PLoS Biol 2021; 19:e3001337. [PMID: 34292944 PMCID: PMC8346290 DOI: 10.1371/journal.pbio.3001337] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 08/06/2021] [Accepted: 06/22/2021] [Indexed: 12/30/2022] Open
Abstract
Peripheral nerve injury–induced mechanical allodynia is often accompanied by abnormalities in the higher cortical regions, yet the mechanisms underlying such maladaptive cortical plasticity remain unclear. Here, we show that in male mice, structural and functional changes in the primary somatosensory cortex (S1) caused by peripheral nerve injury require neuron-microglial signaling within the local circuit. Following peripheral nerve injury, microglia in the S1 maintain ramified morphology and normal density but up-regulate the mRNA expression of brain-derived neurotrophic factor (BDNF). Using in vivo two-photon imaging and Cx3cr1CreER;Bdnfflox mice, we show that conditional knockout of BDNF from microglia prevents nerve injury–induced synaptic remodeling and pyramidal neuron hyperactivity in the S1, as well as pain hypersensitivity in mice. Importantly, S1-targeted removal of microglial BDNF largely recapitulates the beneficial effects of systemic BDNF depletion on cortical plasticity and allodynia. Together, these findings reveal a pivotal role of cerebral microglial BDNF in somatosensory cortical plasticity and pain hypersensitivity. This study reveals that brain-derived neurotrophic factor (BDNF) from cerebral microglia contributes to nerve injury-induced synaptic remodeling and neuronal hyperactivity, and ultimately contributes to pain sensitivity in mice; removal of microglial BDNF has beneficial effects on cortical plasticity and pain.
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Affiliation(s)
- Lianyan Huang
- Department of Anesthesiology, New York University School of Medicine, New York, New York, United States of America
- Neuroscience Program, Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
- * E-mail: (LH); (GY)
| | - Jianhua Jin
- Neuroscience Program, Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Kai Chen
- Department of Anesthesiology, Columbia University Medical Center, New York, New York, United States of America
| | - Sikun You
- Neuroscience Program, Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Hongyang Zhang
- Neuroscience Program, Guangdong Provincial Key Laboratory of Brain Function and Disease, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Alexandra Sideris
- Department of Anesthesiology, New York University School of Medicine, New York, New York, United States of America
| | - Monica Norcini
- Department of Anesthesiology, New York University School of Medicine, New York, New York, United States of America
| | - Esperanza Recio-Pinto
- Department of Anesthesiology, New York University School of Medicine, New York, New York, United States of America
| | - Jing Wang
- Department of Anesthesiology, New York University School of Medicine, New York, New York, United States of America
| | - Wen-Biao Gan
- Department of Anesthesiology, New York University School of Medicine, New York, New York, United States of America
- Skirball Institute, Department of Neuroscience and Physiology, New York University School of Medicine, New York, New York, United States of America
| | - Guang Yang
- Department of Anesthesiology, New York University School of Medicine, New York, New York, United States of America
- Department of Anesthesiology, Columbia University Medical Center, New York, New York, United States of America
- * E-mail: (LH); (GY)
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Bak MS, Park H, Kim SK. Neural Plasticity in the Brain during Neuropathic Pain. Biomedicines 2021; 9:624. [PMID: 34072638 PMCID: PMC8228570 DOI: 10.3390/biomedicines9060624] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 01/02/2023] Open
Abstract
Neuropathic pain is an intractable chronic pain, caused by damage to the somatosensory nervous system. To date, treatment for neuropathic pain has limited effects. For the development of efficient therapeutic methods, it is essential to fully understand the pathological mechanisms of neuropathic pain. Besides abnormal sensitization in the periphery and spinal cord, accumulating evidence suggests that neural plasticity in the brain is also critical for the development and maintenance of this pain. Recent technological advances in the measurement and manipulation of neuronal activity allow us to understand maladaptive plastic changes in the brain during neuropathic pain more precisely and modulate brain activity to reverse pain states at the preclinical and clinical levels. In this review paper, we discuss the current understanding of pathological neural plasticity in the four pain-related brain areas: the primary somatosensory cortex, the anterior cingulate cortex, the periaqueductal gray, and the basal ganglia. We also discuss potential treatments for neuropathic pain based on the modulation of neural plasticity in these brain areas.
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Affiliation(s)
- Myeong Seong Bak
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul 02447, Korea; (M.S.B.); (H.P.)
| | - Haney Park
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul 02447, Korea; (M.S.B.); (H.P.)
| | - Sun Kwang Kim
- Department of Science in Korean Medicine, Graduate School, Kyung Hee University, Seoul 02447, Korea; (M.S.B.); (H.P.)
- Department of Physiology, College of Korean Medicine, Kyung Hee University, Seoul 02447, Korea
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