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Bernard A, Mroué M, Bourthoumieu S, Boyce M, Richard L, Sturtz F, Demiot C, Danigo A. Netazepide, an Antagonist of Cholecystokinin Type 2 Receptor, Prevents Vincristine-Induced Sensory Neuropathy in Mice. Pharmaceuticals (Basel) 2024; 17:144. [PMID: 38399359 PMCID: PMC10892341 DOI: 10.3390/ph17020144] [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: 12/05/2023] [Revised: 01/12/2024] [Accepted: 01/19/2024] [Indexed: 02/25/2024] Open
Abstract
Among the vinca-alkaloid class, vincristine is a potent chemotherapeutic agent with significant neurotoxic effects and is employed to address a wide spectrum of cancer types. Recently, the therapeutic potential of the cholecystokinin type 2 receptor (CCK2R) as a target for vincristine-induced peripheral neuropathy (VIPN) was demonstrated. In this study, the impact of preventive CCK2R blockade using netazepide (Trio Medicines Ltd., London, UK) was investigated in a mouse model of vincristine-induced peripheral neuropathy. Netazepide is a highly selective CCK2R antagonist under development for the treatment of patients with gastric neuroendocrine tumors caused by hypergastrinemia secondary to chronic autoimmune atrophic gastritis. Vincristine-induced peripheral neuropathy was induced by intraperitoneal injections of vincristine at 100 µg/kg/d for 7 days (D0 to D7). Netazepide (2 mg/kg/d or 5 mg/kg/d, per os) was administered one day before vincristine treatment until D7. Vincristine induced a high tactile allodynia from D1 to D7. VIPN was characterized by dorsal root ganglion neuron (DRG) and intraepidermal nerve fiber (IENF) loss, and enlargement and loss of myelinated axons in the sciatic nerve. Netazepide completely prevented the painful symptoms and nerve injuries induced by vincristine. In conclusion, the fact that netazepide protected against vincristine-induced peripheral neuropathy in a mouse model strongly supports the assessment of its therapeutic potential in patients receiving such chemotherapy.
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Affiliation(s)
- Amandine Bernard
- NeurIT Neuropathies et Innovations Thérapeutiques UR 20218, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges, France; (A.B.); (M.M.); (S.B.); (L.R.); (F.S.); (C.D.)
| | - Mohamad Mroué
- NeurIT Neuropathies et Innovations Thérapeutiques UR 20218, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges, France; (A.B.); (M.M.); (S.B.); (L.R.); (F.S.); (C.D.)
| | - Sylvie Bourthoumieu
- NeurIT Neuropathies et Innovations Thérapeutiques UR 20218, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges, France; (A.B.); (M.M.); (S.B.); (L.R.); (F.S.); (C.D.)
- Department of Cytogenetic, Medical Genetic and Reproduction Biology, University Hospital of Limoges, 87042 Limoges, France
| | - Malcolm Boyce
- Hammersmith Medicines Research Limited and Trio Medicines Limited, 44 Cumberland Avenue, London NW10 7EW, UK;
| | - Laurence Richard
- NeurIT Neuropathies et Innovations Thérapeutiques UR 20218, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges, France; (A.B.); (M.M.); (S.B.); (L.R.); (F.S.); (C.D.)
- Department of Neurology, Reference Center for Rare Peripheral Neuropathies, University Hospital of Limoges, 87042 Limoges, France
| | - Franck Sturtz
- NeurIT Neuropathies et Innovations Thérapeutiques UR 20218, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges, France; (A.B.); (M.M.); (S.B.); (L.R.); (F.S.); (C.D.)
- Department of Biochemistry and Molecular Genetics, University Hospital of Limoges, 87042 Limoges, France
| | - Claire Demiot
- NeurIT Neuropathies et Innovations Thérapeutiques UR 20218, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges, France; (A.B.); (M.M.); (S.B.); (L.R.); (F.S.); (C.D.)
- Transversal and Territorial Therapeutic Education Unit (UTTEP87), University Hospital of Limoges, 87042 Limoges, France
| | - Aurore Danigo
- NeurIT Neuropathies et Innovations Thérapeutiques UR 20218, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges, France; (A.B.); (M.M.); (S.B.); (L.R.); (F.S.); (C.D.)
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Ling J, He C, Zhang S, Zhao Y, Zhu M, Tang X, Li Q, Xu L, Yang Y. Progress in methods for evaluating Schwann cell myelination and axonal growth in peripheral nerve regeneration via scaffolds. Front Bioeng Biotechnol 2023; 11:1308761. [PMID: 38162183 PMCID: PMC10755477 DOI: 10.3389/fbioe.2023.1308761] [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: 10/09/2023] [Accepted: 11/20/2023] [Indexed: 01/03/2024] Open
Abstract
Peripheral nerve injury (PNI) is a neurological disorder caused by trauma that is frequently induced by accidents, war, and surgical complications, which is of global significance. The severity of the injury determines the potential for lifelong disability in patients. Artificial nerve scaffolds have been investigated as a powerful tool for promoting optimal regeneration of nerve defects. Over the past few decades, bionic scaffolds have been successfully developed to provide guidance and biological cues to facilitate Schwann cell myelination and orientated axonal growth. Numerous assessment techniques have been employed to investigate the therapeutic efficacy of nerve scaffolds in promoting the growth of Schwann cells and axons upon the bioactivities of distinct scaffolds, which have encouraged a greater understanding of the biological mechanisms involved in peripheral nerve development and regeneration. However, it is still difficult to compare the results from different labs due to the diversity of protocols and the availability of innovative technologies when evaluating the effectiveness of novel artificial scaffolds. Meanwhile, due to the complicated process of peripheral nerve regeneration, several evaluation methods are usually combined in studies on peripheral nerve repair. Herein, we have provided an overview of the evaluation methods used to study the outcomes of scaffold-based therapies for PNI in experimental animal models and especially focus on Schwann cell functions and axonal growth within the regenerated nerve.
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Affiliation(s)
- Jue Ling
- Key Laboratory of Neuroregeneration, Ministry of Education and Jiangsu Province, Co-Innovation Center of Tissue Engineering and Nerve Injury Repair, Nantong University, Nantong, China
| | - Chang He
- Key Laboratory of Neuroregeneration, Ministry of Education and Jiangsu Province, Co-Innovation Center of Tissue Engineering and Nerve Injury Repair, Nantong University, Nantong, China
| | - Shuxuan Zhang
- Key Laboratory of Neuroregeneration, Ministry of Education and Jiangsu Province, Co-Innovation Center of Tissue Engineering and Nerve Injury Repair, Nantong University, Nantong, China
| | - Yahong Zhao
- Key Laboratory of Neuroregeneration, Ministry of Education and Jiangsu Province, Co-Innovation Center of Tissue Engineering and Nerve Injury Repair, Nantong University, Nantong, China
| | - Meifeng Zhu
- College of Life Sciences, Nankai University, Tianjin, China
| | - Xiaoxuan Tang
- Key Laboratory of Neuroregeneration, Ministry of Education and Jiangsu Province, Co-Innovation Center of Tissue Engineering and Nerve Injury Repair, Nantong University, Nantong, China
| | - Qiaoyuan Li
- Key Laboratory of Neuroregeneration, Ministry of Education and Jiangsu Province, Co-Innovation Center of Tissue Engineering and Nerve Injury Repair, Nantong University, Nantong, China
| | - Liming Xu
- Institute of Medical Device Control, National Institutes for Food and Drug Control, Beijing, China
| | - Yumin Yang
- Key Laboratory of Neuroregeneration, Ministry of Education and Jiangsu Province, Co-Innovation Center of Tissue Engineering and Nerve Injury Repair, Nantong University, Nantong, China
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Zhang WJ, Liu SC, Ming LG, Yu JW, Zuo C, Hu DX, Luo HL, Zhang Q. Potential role of Schwann cells in neuropathic pain. Eur J Pharmacol 2023; 956:175955. [PMID: 37541365 DOI: 10.1016/j.ejphar.2023.175955] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 07/26/2023] [Accepted: 08/01/2023] [Indexed: 08/06/2023]
Abstract
Neuropathic pain (NPP) is a common syndrome associated with most forms of disease, which poses a serious threat to human health. NPP may persist even after the nociceptive stimulation is eliminated, and treatment is extremely challenging in such cases. Schwann cells (SCs) form the myelin sheaths around neuronal axons and play a crucial role in neural information transmission. SCs can secrete trophic factors to nourish and protect axons, and can further secrete pain-related factors to induce pain. SCs may be activated by peripheral nerve injury, triggering the transformation of myelinated and non-myelinated SCs into cell phenotypes that specifically promote repair. These differentiated SCs provide necessary signals and spatial clues for survival, axonal regeneration, and nerve regeneration of damaged neurons. They can further change the microenvironment around the regions of nerve injury, and relieve the pain by repairing the injured nerve. Herein, we provide a comprehensive overview of the biological characteristics of SCs, discuss the relationship between SCs and nerve injury, and explore the potential mechanism of SCs and the occurrence of NPP. Moreover, we summarize the feasible strategies of SCs in the treatment of NPP, and attempt to elucidate the deficiencies and defects of SCs in the treatment of NPP.
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Affiliation(s)
- Wen-Jun Zhang
- Department of Rehabilitation Medicine, The Second Affiliated Hospital, Nanchang University, Nanchang City, Jiangxi province, 343000, China
| | - Si-Cheng Liu
- Department of Gastrointestinal surgery, The Second Affiliated Hospital, Nanchang University, Nanchang City, Jiangxi province, 343000, China
| | - Li-Guo Ming
- Department of Gastrointestinal surgery, The Second Affiliated Hospital, Nanchang University, Nanchang City, Jiangxi province, 343000, China
| | - Jian-Wen Yu
- Department of Gastrointestinal surgery, The Second Affiliated Hospital, Nanchang University, Nanchang City, Jiangxi province, 343000, China
| | - Cheng Zuo
- Department of Gastrointestinal surgery, The Second Affiliated Hospital, Nanchang University, Nanchang City, Jiangxi province, 343000, China
| | - Dong-Xia Hu
- Department of Rehabilitation Medicine, The Second Affiliated Hospital, Nanchang University, Nanchang City, Jiangxi province, 343000, China
| | - Hong-Liang Luo
- Department of Gastrointestinal surgery, The Second Affiliated Hospital, Nanchang University, Nanchang City, Jiangxi province, 343000, China.
| | - Qiao Zhang
- Orthopedics Department, The Second Affiliated Hospital, Nanchang University, Nanchang City, Jiangxi province, 343000, China.
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Tang J, Lin M, Ou C. High-throughput transcriptome sequencing reveals the critical role of long non-coding RNA Gm14376 in the occurrence of neuropathic pain. Neurosci Lett 2023; 810:137312. [PMID: 37236343 DOI: 10.1016/j.neulet.2023.137312] [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: 01/30/2023] [Revised: 04/02/2023] [Accepted: 04/18/2023] [Indexed: 05/28/2023]
Abstract
Long noncoding RNAs (lncRNAs) have been suggested as important regulators in neuropathic pain. Our study aims to explore the possible molecular mechanism underlying the role of long non-coding RNA (lncRNA) Gm14376 in neuropathic pain in mice by high-throughput transcriptome sequencing. A mouse model of spared nerve injury (SNI) was constructed for mechanical, thermal and spontaneous pain testing. Transcriptomic changes in lncRNAs and mRNAs in the dorsal root ganglion (DRG) of SNI mice were analyzed using RNA-sequencing techniques in conjunction with public data analysis. AAV5 viral vector was constructed to assess the effect of Gm14376 on SNI-induced pain hypersensitivity and inflammatory response. Cis-target genes of Gm14376 were obtained and the functions of Gm14376 were analyzed by GO and KEGG pathway enrichment analyses. Results from bioinformatic analysis identified a conserved Gm14376, which was up-regulated in the DRG of SNI mice, specifically in response to nerve injury. Overexpression of Gm14376 in DRG induced neuropathic pain-like symptoms in mice. Furthermore, the functions of Gm14376 were related to the phosphatidylinositol 3-kinase (PI3K)/Akt pathway and fibroblast growth factor 3 (Fgf3) was identified as the cis-target gene of Gm14376. Gm14376 could directly up-regulate Fgf3 expression to activate the PI3K/Akt pathway, which alleviated pain hypersensitivity to mechanical and thermal stimuli and reduced the release of inflammatory factors in SNI mice. From our data, we conclude that SNI-induced up-regulation of Gm14376 expression in DRG activates the PI3K/Akt pathway through up-regulation of Fgf3 expression, thereby promoting the development of neuropathic pain in mice.
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Affiliation(s)
- Jian Tang
- Department of Pain Management, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China; Anesthesiology and Critical Care Medicine Key Laboratory of Luzhou, Department of Anesthesiology, Southwest Medical University, Luzhou, Sichuan Province 64600, 0, China
| | - Min Lin
- Department of Pain Management, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China; Anesthesiology and Critical Care Medicine Key Laboratory of Luzhou, Department of Anesthesiology, Southwest Medical University, Luzhou, Sichuan Province 64600, 0, China
| | - Cehua Ou
- Department of Pain Management, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.
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3D culture of the spinal cord with roots as an ex vivo model for comparative studies of motor and sensory nerve regeneration. Exp Neurol 2023; 362:114322. [PMID: 36652972 DOI: 10.1016/j.expneurol.2023.114322] [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: 09/28/2022] [Revised: 12/21/2022] [Accepted: 01/13/2023] [Indexed: 01/18/2023]
Abstract
Motor and sensory nerves exhibit tissue-specific structural and functional features. However, in vitro models designed to reflect tissue-specific differences between motor and sensory nerve regeneration have rarely been reported. Here, by embedding the spinal cord with roots (SCWR) in a 3D hydrogel environment, we compared the nerve regeneration processes between the ventral and dorsal roots. The 3D hydrogel environment induced an outward migration of neurons in the gray matter of the spinal cord, which allowed the long-term survival of motor neurons. Tuj1 immunofluorescence labeling confirmed the regeneration of neurites from both the ventral and dorsal roots. Next, we detected asymmetric ventral and dorsal root regeneration in response to nerve growth factor (NGF) and glial cell line-derived neurotrophic factor (GDNF), and we observed motor and sensory Schwann cell phenotypes in the regenerated ventral and dorsal roots, respectively. Moreover, based on the SCWR model, we identified a targeted effect of collagen VI on sensory nerve fasciculation and characterized the protein expression profiles correlating to motor/sensory-specific nerve regeneration. These results suggest that the SCWR model can serve as a valuable ex vivo model for comparative study of motor and sensory nerve regeneration and for pharmacodynamic evaluations.
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DAP12 deletion causes age-related motor function impairment but promotes functional recovery after sciatic nerve crush injury. Exp Neurol 2023; 360:114296. [PMID: 36503041 DOI: 10.1016/j.expneurol.2022.114296] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 11/18/2022] [Accepted: 12/07/2022] [Indexed: 12/13/2022]
Abstract
DNAX activating protein of 12 kDa (DAP12)-deficiency mice showed impaired differentiation of oligodendrocytes and reduced myelin in the central nervous system. Whether DAP12 is expressed by Schwann cells and its roles in the peripheral nervous system (PNS) remains unknown. In this study, expression of DAP12 was detected in Schwann cells in vivo and in vitro. The DAP12-knockout (KO) mice showed age-related motor deficits and thinner myelin in the sciatic nerve than WT mice but significantly faster clinical recovery after sciatic nerve crush injury. In sciatic nerves of DAP12 KO and WT mice, proteomic profiles analysis identified 158 differentially expressed proteins (DEPs) at 8-week-old, 29 DEPs at 54-week-old and 33 DEPs at two weeks after crush injury. Typically, of the DEPs at 54-week-old, up-regulated Lgmn and down-regulated RecK and Yap1 were associated with myelin loss in the sciatic nerve of DAP12 KO mice. Upregulation of nicotinamide nucleotide transhydrogenase and haptoglobin were associated with the accumulation of macrophages in the crushed sciatic nerve of DAP12 KO mice. After crush injury, there were significantly more M1 macrophages at one-week and more M2 macrophages at two-week in sciatic nerve of DAP12 KO mice than WT mice, indicating that DAP12 deletion promotes the phenotype conversion of macrophages from M1 to M2. Collectively, our findings suggest that DAP12 may exert dual roles in the PNS including promoting the physiological myelin formation and maintenance of Schwann cells but delaying nerve repair after injury by modulating the recruitment of macrophages and phenotype conversion.
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A new mouse model of Charcot-Marie-Tooth 2J neuropathy replicates human axonopathy and suggest alteration in axo-glia communication. PLoS Genet 2022; 18:e1010477. [DOI: 10.1371/journal.pgen.1010477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 11/29/2022] [Accepted: 10/13/2022] [Indexed: 11/10/2022] Open
Abstract
Myelin is essential for rapid nerve impulse propagation and axon protection. Accordingly, defects in myelination or myelin maintenance lead to secondary axonal damage and subsequent degeneration. Studies utilizing genetic (CNPase-, MAG-, and PLP-null mice) and naturally occurring neuropathy models suggest that myelinating glia also support axons independently from myelin. Myelin protein zero (MPZ or P0), which is expressed only by Schwann cells, is critical for myelin formation and maintenance in the peripheral nervous system. Many mutations in MPZ are associated with demyelinating neuropathies (Charcot-Marie-Tooth disease type 1B [CMT1B]). Surprisingly, the substitution of threonine by methionine at position 124 of P0 (P0T124M) causes axonal neuropathy (CMT2J) with little to no myelin damage. This disease provides an excellent paradigm to understand how myelinating glia support axons independently from myelin. To study this, we generated targeted knock-in MpzT124M mutant mice, a genetically authentic model of T124M-CMT2J neuropathy. Similar to patients, these mice develop axonopathy between 2 and 12 months of age, characterized by impaired motor performance, normal nerve conduction velocities but reduced compound motor action potential amplitudes, and axonal damage with only minor compact myelin modifications. Mechanistically, we detected metabolic changes that could lead to axonal degeneration, and prominent alterations in non-compact myelin domains such as paranodes, Schmidt-Lanterman incisures, and gap junctions, implicated in Schwann cell-axon communication and axonal metabolic support. Finally, we document perturbed mitochondrial size and distribution along MpzT124M axons suggesting altered axonal transport. Our data suggest that Schwann cells in P0T124M mutant mice cannot provide axons with sufficient trophic support, leading to reduced ATP biosynthesis and axonopathy. In conclusion, the MpzT124M mouse model faithfully reproduces the human neuropathy and represents a unique tool for identifying the molecular basis for glial support of axons.
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Deborde S, Wong RJ. The Role of Schwann Cells in Cancer. Adv Biol (Weinh) 2022; 6:e2200089. [PMID: 35666078 PMCID: PMC9474572 DOI: 10.1002/adbi.202200089] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 05/14/2022] [Indexed: 01/28/2023]
Abstract
Schwann cells (SCs) are the most abundant cell type in the nerves in the peripheral nervous system and compose a family of subtypes that are endowed with a variety of different functions. SCs facilitate the transmission of neural impulses, provide nutrients and protection for neurons, guide axons in nerve repair, and regulate immune functions. In the context of cancer, recent studies have revealed an active role of SCs in promoting cancer cell invasion, modulating immune responses, and transmitting pain sensation.
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Affiliation(s)
- Sylvie Deborde
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA
- David M. Rubenstein Center for Pancreatic Cancer Research, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA
| | - Richard J Wong
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA
- David M. Rubenstein Center for Pancreatic Cancer Research, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA
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Jiang X, Wu J, Guo C, Song W. Key LncRNAs Associated With Oxidative Stress Were Identified by GEO Database Data and Whole Blood Analysis of Intervertebral Disc Degeneration Patients. Front Genet 2022; 13:929843. [PMID: 35937989 PMCID: PMC9353269 DOI: 10.3389/fgene.2022.929843] [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] [Received: 04/27/2022] [Accepted: 06/17/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Intervertebral disc degeneration (IDD) is a major cause of low back pain, but the onset and progression of IDD are unknown. Long non-coding RNA (lncRNA) has been validated to play a critical role in IDD, while an increasing number of studies have linked oxidative stress (OS) to the initiation and progression of IDD. We aim to investigate key lncRNAs in IDD through a comprehensive network of competing endogenous RNA (ceRNA) and to identify possible underlying mechanisms. Methods: We downloaded IDD-related gene expression data from the Gene Expression Omnibus (GEO) database and obtained differentially expressed-lncRNAs (DE-lncRNA), -microRNAs (DE-miRNA), and -messenger RNAs (DE-mRNA) by bioinformatics analysis. The OS-related lncRNA-miRNA-mRNA ceRNA interaction axis was constructed and key lncRNAs were identified based on ceRNA theory. We performed gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses on mRNAs regulated by lncRNAs in the ceRNA network. Single sample gene set enrichment analysis (ssGSEA) was used to reveal the immune landscape. Expression of key lncRNAs in IDD was assessed by quantitative reverse transcription-polymerase chain reaction (qRT-PCR). Results: In this study, 111 DE-mRNAs, 20 DE-lncRNAs, and 502 DE-miRNAs were identified between IDD patients and controls, and 16 OS-related DE-lncRNAs were also identified. The resulting lncRNA-miRNA-mRNA network consisted of eight OS-related DE-lncRNA nodes, 24 DE-miRNA nodes, 70 DE-mRNA nodes, and 183 edges. Functional enrichment analysis suggested that the ceRNA network may be involved in regulating biological processes related to cytokine secretion, lipid, and angiogenesis. We also identified four key lncRNAs, namely lncRNA GNAS-AS1, lncRNA MIR100HG, lncRNA LINC01359, and lncRNA LUCAT1, which were also found to be significantly associated with immune cells. Conclusion: These results provide novel insights into the potential applications of OS-related lncRNAs in patients with IDD.
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Zheng Q, Dong X, Green DP, Dong X. Peripheral mechanisms of chronic pain. MEDICAL REVIEW 2022; 2:251-270. [PMID: 36067122 PMCID: PMC9381002 DOI: 10.1515/mr-2022-0013] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 06/13/2022] [Indexed: 11/15/2022]
Abstract
Abstract
Acutely, pain serves to protect us from potentially harmful stimuli, however damage to the somatosensory system can cause maladaptive changes in neurons leading to chronic pain. Although acute pain is fairly well controlled, chronic pain remains difficult to treat. Chronic pain is primarily a neuropathic condition, but studies examining the mechanisms underlying chronic pain are now looking beyond afferent nerve lesions and exploring new receptor targets, immune cells, and the role of the autonomic nervous system in contributing chronic pain conditions. The studies outlined in this review reveal how chronic pain is not only confined to alterations in the nervous system and presents findings on new treatment targets and for this debilitating disease.
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Affiliation(s)
- Qin Zheng
- Department of Anesthesiology and Critical Care Medicine, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Xintong Dong
- The Solomon H. Snyder Department of Neuroscience, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Dustin P. Green
- Department of Neuroscience, Cell Biology, and Anatomy, University of Texas Medical Branch, Galveston, TX, USA
| | - Xinzhong Dong
- The Solomon H. Snyder Department of Neuroscience, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
- Howard Hughes Medical Institute, School of Medicine, Johns Hopkins University, Baltimore, MD, USA
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Özdağ Acarli AN, Klein T, Egenolf N, Sommer C, Üçeyler N. Subepidermal Schwann cell counts correlate with skin innervation - an exploratory study. Muscle Nerve 2022; 65:471-479. [PMID: 35020203 DOI: 10.1002/mus.27496] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 01/05/2022] [Accepted: 01/05/2022] [Indexed: 11/10/2022]
Abstract
INTRODUCTION/AIMS Schwann cell clusters have been described at the murine dermis-epidermis border. We quantified dermal Schwann cells in the skin of patients with small fiber neuropathy (SFN) compared to healthy controls to correlate with the clinical phenotype. METHODS Skin punch biopsies from the lower legs of 28 patients with SFN (eleven men, 17 women, median age 54 years [19-73]) and 9 healthy controls (five men, four women, median age 34 years [25-69]) were immunoreacted for S100 calcium-binding protein B as a Schwann cell marker, protein-gene product 9.5 as a pan-neuronal marker, and CD207 as a Langerhans cell marker. Intraepidermal nerve fiber density (IENFD) and subepidermal Schwann cell counts were determined. RESULTS Skin samples of patients with SFN showed lower IENFD (p<0.05), fewer Schwann cells/mm (p<0.01), and fewer Schwann cell clusters/mm (p<0.05) than controls. When comparing SFN patients with reduced (n=13, median age 53 years, 19-73 years) and normal distal (n=15, median age 54 years, 43-68 years) IENFD, the number of solitary Schwann cells/mm (p<0.01) and subepidermal nerve fibers associated with Schwann cell branches (p<0.05) were lower in patients with reduced IENFD. All three parameters positively correlated with distal IENFD (p<0.05 to p<0.01), while no correlation was found between Schwann cell counts and clinical pain characteristics. DISCUSSION Our data raise questions about the mechanisms underlying the interdependence of dermal Schwann cells and skin innervation in SFN. The temporal course and functional impact of Schwann cell presence and kinetics need further investigation.
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Affiliation(s)
| | - Thomas Klein
- Department of Neurology, University of Würzburg, Germany
| | - Nadine Egenolf
- Department of Neurology, University of Würzburg, Germany
| | - Claudia Sommer
- Department of Neurology, University of Würzburg, Germany
| | - Nurcan Üçeyler
- Department of Neurology, University of Würzburg, Germany
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Zhang C, Hu MW, Wang XW, Cui X, Liu J, Huang Q, Cao X, Zhou FQ, Qian J, He SQ, Guan Y. scRNA-sequencing reveals subtype-specific transcriptomic perturbations in DRG neurons of PirtEGFPf mice in neuropathic pain condition. eLife 2022; 11:76063. [PMID: 36264609 PMCID: PMC9584610 DOI: 10.7554/elife.76063] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 10/03/2022] [Indexed: 01/22/2023] Open
Abstract
Functionally distinct subtypes/clusters of dorsal root ganglion (DRG) neurons may play different roles in nerve regeneration and pain. However, details about their transcriptomic changes under neuropathic pain conditions remain unclear. Chronic constriction injury (CCI) of the sciatic nerve represents a well-established model of neuropathic pain, and we conducted single-cell RNA-sequencing (scRNA-seq) to characterize subtype-specific perturbations of transcriptomes in lumbar DRG neurons on day 7 post-CCI. By using PirtEGFPf mice that selectively express an enhanced green fluorescent protein in DRG neurons, we established a highly efficient purification process to enrich neurons for scRNA-seq. We observed the emergence of four prominent CCI-induced clusters and a loss of marker genes in injured neurons. Importantly, a portion of injured neurons from several clusters were spared from injury-induced identity loss, suggesting subtype-specific transcriptomic changes in injured neurons. Moreover, uninjured neurons, which are necessary for mediating the evoked pain, also demonstrated cell-type-specific transcriptomic perturbations in these clusters, but not in others. Notably, male and female mice showed differential transcriptomic changes in multiple neuronal clusters after CCI, suggesting transcriptomic sexual dimorphism in DRG neurons after nerve injury. Using Fgf3 as a proof-of-principle, RNAscope study provided further evidence of increased Fgf3 in injured neurons after CCI, supporting scRNA-seq analysis, and calcium imaging study unraveled a functional role of Fgf3 in neuronal excitability. These findings may contribute to the identification of new target genes and the development of DRG neuron cell-type-specific therapies for optimizing neuropathic pain treatment and nerve regeneration.
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Affiliation(s)
- Chi Zhang
- Department of Anesthesiology and Critical Care Medicine, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Ming-Wen Hu
- Department of Ophthalmology, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Xue-Wei Wang
- Department of Orthopaedic Surgery, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Xiang Cui
- Department of Anesthesiology and Critical Care Medicine, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Jing Liu
- Department of Anesthesiology and Critical Care Medicine, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Qian Huang
- Department of Anesthesiology and Critical Care Medicine, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Xu Cao
- Department of Orthopaedic Surgery, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Feng-Quan Zhou
- Department of Orthopaedic Surgery, The Johns Hopkins University School of MedicineBaltimoreUnited States,The Solomon H. Snyder Department of Neuroscience, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Jiang Qian
- Department of Ophthalmology, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Shao-Qiu He
- Department of Anesthesiology and Critical Care Medicine, The Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Yun Guan
- Department of Anesthesiology and Critical Care Medicine, The Johns Hopkins University School of MedicineBaltimoreUnited States,Department of Neurological Surgery, The Johns Hopkins University School of MedicineBaltimoreUnited States
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13
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Wistrom E, Chase R, Smith PR, Campbell ZT. A compendium of validated pain genes. WIREs Mech Dis 2022; 14:e1570. [PMID: 35760453 PMCID: PMC9787016 DOI: 10.1002/wsbm.1570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/28/2022] [Accepted: 06/06/2022] [Indexed: 12/30/2022]
Abstract
The development of novel pain therapeutics hinges on the identification and rigorous validation of potential targets. Model organisms provide a means to test the involvement of specific genes and regulatory elements in pain. Here we provide a list of genes linked to pain-associated behaviors. We capitalize on results spanning over three decades to identify a set of 242 genes. They support a remarkable diversity of functions spanning action potential propagation, immune response, GPCR signaling, enzymatic catalysis, nucleic acid regulation, and intercellular signaling. Making use of existing tissue and single-cell high-throughput RNA sequencing datasets, we examine their patterns of expression. For each gene class, we discuss archetypal members, with an emphasis on opportunities for additional experimentation. Finally, we discuss how powerful and increasingly ubiquitous forward genetic screening approaches could be used to improve our ability to identify pain genes. This article is categorized under: Neurological Diseases > Genetics/Genomics/Epigenetics Neurological Diseases > Molecular and Cellular Physiology.
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Affiliation(s)
- Eric Wistrom
- Department of Biological SciencesUniversity of Texas at DallasRichardsonTexasUSA
| | - Rebecca Chase
- Department of Biological SciencesUniversity of Texas at DallasRichardsonTexasUSA
| | - Patrick R. Smith
- Department of Biological SciencesUniversity of Texas at DallasRichardsonTexasUSA
| | - Zachary T. Campbell
- Department of Biological SciencesUniversity of Texas at DallasRichardsonTexasUSA,Center for Advanced Pain StudiesUniversity of Texas at DallasRichardsonTexasUSA
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14
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The Cholecystokinin Type 2 Receptor, a Pharmacological Target for Pain Management. Pharmaceuticals (Basel) 2021; 14:ph14111185. [PMID: 34832967 PMCID: PMC8618735 DOI: 10.3390/ph14111185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/16/2021] [Accepted: 11/18/2021] [Indexed: 02/06/2023] Open
Abstract
Over the past decades, accumulating evidence has demonstrated a pivotal role of cholecystokinin type 2 receptor (CCK2R) in pain modulation. The established role of CCK2R activation in directly facilitating nociception has led to the development of several CCK2R antagonists, which have been shown to successfully alleviate pain in several rodent models of pain. However, the outcomes of clinical trials are more modest since they have not demonstrated the expected biological effect obtained in animals. Such discordances of results between preclinical and clinical studies suggest reconsidering our knowledge about the molecular basis of the pharmacology and functioning of CCK2R. This review focuses on the cellular localization of CCK2R specifically in the sensory nervous system and discusses in further detail the molecular mechanisms and signal transduction pathways involved in controlling pain perception. We then provide a comprehensive overview of the most successful compounds targeting CCK2R and report recent advances in pharmacological strategies used to achieve CCK2R modulation. We purposely distinguish between CCK2R benefits obtained in preclinical models and outcomes in clinical trials with different pain etiologies. Lastly, we emphasize the biological and clinical relevance of CCK2R as a promising target for the development of new treatments for pain management.
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15
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Yang X, Zhu L, Zhao B, Hu J, Deng F, Lei S, Yao ZW, Liu K. Screening and Identification of Key Genes, Pathways, and Drugs Associated with Neuropathic Pain in Dorsal Horn: Evidence from Bioinformatic Analysis. J Pain Res 2021; 14:1813-1826. [PMID: 34168490 PMCID: PMC8217596 DOI: 10.2147/jpr.s312117] [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: 03/21/2021] [Accepted: 05/20/2021] [Indexed: 11/23/2022] Open
Abstract
Purpose Neuropathic pain is a devastating complex condition occurring post-nervous system damage. Microglia in dorsal horn drives neuropathic pain as a kind of immune cell. We aimed to find potential differentially expressed genes (DEGs) and candidate pathways, which induced neuropathic pain, and to identify some new transcription factors and therapeutic drugs via bioinformatic analysis. Methods The microarray profile GSE60670 was downloaded and analyzed. DEGs were screened and analyzed through Gene Ontology (GO), pathway enrichment, and protein-to-protein interaction (PPI) network. Respectively, transcription factors (TFs) and potential therapeutic drugs for DEGs were predicted through NetworkAnalyst and DGIdb databases. At last, we chose top 10 DEGs for external validation. Results A total of 100 DEGs were identified. The results of pathway and GO analyses were closely related to malaria inflammatory pathway and inflammatory response. Three necessary PPI modules and 9 hub genes were identified in PPI analysis, and 277 DEG-TF pairs were found among 54 DEGs and 32 TF. Moreover, 22 candidate drugs were found to match 9 hub genes. External validation of 9 of the top 10 DEGs were consistent with bioinformatic analysis. Conclusion This study provided comprehensive analyses for the functional gene sets and pathways related to neuropathic pain and promoted our understanding of the mechanism or therapy of neuropathic pain.
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Affiliation(s)
- Xiao Yang
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Lin Zhu
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Bingcheng Zhao
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Jingjuan Hu
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Fan Deng
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Shaohui Lei
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Zhi-Wen Yao
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Kexuan Liu
- Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, People's Republic of China
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