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Hayward R, Moore S, Artun D, Madhavan A, Harte E, Torres-Pérez JV, Nagy I. Transcriptional reprogramming post-peripheral nerve injury: A systematic review. Neurobiol Dis 2024; 200:106624. [PMID: 39097036 DOI: 10.1016/j.nbd.2024.106624] [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: 06/28/2024] [Revised: 07/27/2024] [Accepted: 07/30/2024] [Indexed: 08/05/2024] Open
Abstract
Neuropathic pain is characterised by periodic or continuous hyperalgesia, numbness, or allodynia, and results from insults to the somatosensory nervous system. Peripheral nerve injury induces transcriptional reprogramming in peripheral sensory neurons, contributing to increased spinal nociceptive input and the development of neuropathic pain. Effective treatment for neuropathic pain remains an unmet medical need as current therapeutics offer limited effectiveness and have undesirable effects. Understanding transcriptional changes in peripheral nerve injury-induced neuropathy might offer a path for novel analgesics. Our literature search identified 65 papers exploring transcriptomic changes post-peripheral nerve injury, many of which were conducted in animal models. We scrutinize their transcriptional changes data and conduct gene ontology enrichment analysis to reveal their common functional profile. Focusing on genes involved in 'sensory perception of pain' (GO:0019233), we identified transcriptional changes for different ion channels, receptors, and neurotransmitters, shedding light on its role in nociception. Examining peripheral sensory neurons subtype-specific transcriptional reprograming and regeneration-associated genes, we delved into downstream regulation of hypersensitivity. Identifying the temporal program of transcription regulatory mechanisms might help develop better therapeutics to target them effectively and selectively, thus preventing the development of neuropathic pain without affecting other physiological functions.
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Affiliation(s)
- R Hayward
- Nociception Group, Department of Surgery and Cancer, Division of Anaesthetics, Pain Medicine and Intensive Care, Chelsea and Westminster Hospital Campus, Imperial College London, 369 Fulham Road, London SW10 9FJ, UK
| | - S Moore
- Nociception Group, Department of Surgery and Cancer, Division of Anaesthetics, Pain Medicine and Intensive Care, Chelsea and Westminster Hospital Campus, Imperial College London, 369 Fulham Road, London SW10 9FJ, UK
| | - D Artun
- Nociception Group, Department of Surgery and Cancer, Division of Anaesthetics, Pain Medicine and Intensive Care, Chelsea and Westminster Hospital Campus, Imperial College London, 369 Fulham Road, London SW10 9FJ, UK
| | - A Madhavan
- Nociception Group, Department of Surgery and Cancer, Division of Anaesthetics, Pain Medicine and Intensive Care, Chelsea and Westminster Hospital Campus, Imperial College London, 369 Fulham Road, London SW10 9FJ, UK
| | - E Harte
- Nociception Group, Department of Surgery and Cancer, Division of Anaesthetics, Pain Medicine and Intensive Care, Chelsea and Westminster Hospital Campus, Imperial College London, 369 Fulham Road, London SW10 9FJ, UK
| | - J V Torres-Pérez
- Departament de Biologia Cel·lular, Biologia Funcional i Antropologia Física, Facultat de Ciències Biològiques, Universitat de València, C/Dr. Moliner 50, 46100 Burjassot, Spain.
| | - I Nagy
- Nociception Group, Department of Surgery and Cancer, Division of Anaesthetics, Pain Medicine and Intensive Care, Chelsea and Westminster Hospital Campus, Imperial College London, 369 Fulham Road, London SW10 9FJ, UK.
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Kan YY, Chang YS, Liao WC, Chao TN, Hsieh YL. Roles of Neuronal Protein Kinase Cε on Endoplasmic Reticulum Stress and Autophagic Formation in Diabetic Neuropathy. Mol Neurobiol 2024; 61:2481-2495. [PMID: 37906389 PMCID: PMC11043183 DOI: 10.1007/s12035-023-03716-x] [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: 06/08/2023] [Accepted: 10/14/2023] [Indexed: 11/02/2023]
Abstract
In chronic diabetic neuropathy (DN), the cellular mechanisms of neuropathic pain remain unclear. Protein kinase C epsilon (PKCε) is an intracellular signaling molecule that mediates chronic pain. This paper addresses the long-term upregulated PKCε in DN associated with endoplasmic reticulum (ER) stress and autophagic formation and correlates to chronic neuropathic pain. We found that thermal hyperalgesia and mechanical allodynia course development were associated with PKCε upregulation after DN but not skin denervation. Pathologically, PKCε upregulation was associated with the expression of inositol-requiring enzyme 1α (IRE1α; ER stress-related molecule) and ubiquitin D (UBD), which are involved in the ubiquitin-proteasome system (UPS)-mediated degradation of misfolded proteins under ER stress. Manders coefficient analyses revealed an approximately 50% colocalized ratio for IRE1α(+):PKCε(+) neurons (0.34-0.48 for M1 and 0.40-0.58 for M2 Manders coefficients). The colocalized coefficients of UBD/PKCε increased (M1: 0.33 ± 0.03 vs. 0.77 ± 0.04, p < 0.001; M2: 0.29 ± 0.05 vs. 0.78 ± 0.04; p < 0.001) in the acute DN stage. In addition, the regulatory subunit p85 of phosphoinositide 3-kinase, which is involved in regulating insulin signaling, exhibited similar expression patterns to those of IRE1α and UBD; for example, it had highly colocalized ratios to PKCε. The ultrastructural examination further confirmed that autophagic formation was associated with PKCε upregulation. Furthermore, PKCεv1-2, a PKCε specific inhibitor, reverses neuropathic pain, ER stress, and autophagic formation in DN. This finding suggests PKCε plays an upstream molecule in DN-associated neuropathic pain and neuropathology and could provide a potential therapeutic target.
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Affiliation(s)
- Yu-Yu Kan
- School of Medicine, College of Medicine, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Ying-Shuang Chang
- Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan
| | - Wen-Chieh Liao
- Doctoral Program in Tissue Engineering and Regenerative Medicine, College of Medicine, National Chung Hsing University, Taichung, 40227, Taiwan
- Department of Post-Baccalaureate Medicine, College of Medicine, National Chung Hsing University, Taichung, 40227, Taiwan
| | - Tzu-Ning Chao
- Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan
| | - Yu-Lin Hsieh
- Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan.
- School of Post-Baccalaureate Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan.
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung, 80708, Taiwan.
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Kan HW, Ho YC, Chang YS, Hsieh YL. SEPT9 Upregulation in Satellite Glial Cells Associated with Diabetic Polyneuropathy in a Type 2 Diabetes-like Rat Model. Int J Mol Sci 2022; 23:ijms23169372. [PMID: 36012625 PMCID: PMC9409324 DOI: 10.3390/ijms23169372] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 08/16/2022] [Accepted: 08/18/2022] [Indexed: 11/16/2022] Open
Abstract
Despite the worldwide prevalence and severe complications of type 2 diabetes mellitus (T2DM), the pathophysiological mechanisms underlying the development of diabetic polyneuropathy (DPN) are poorly understood. Beyond strict control of glucose levels, clinical trials for reversing DPN have largely failed. Therefore, understanding the pathophysiological and molecular mechanisms underlying DPN is crucial. Accordingly, this study explored biochemical and neuropathological deficits in a rat model of T2DM induced through high-fat diet (HFD) feeding along with two low-dose streptozotocin (STZ) injections; the deficits were explored through serum lipid, neurobehavioral, neurophysiology, neuropathology, and immunohistochemistry examinations. Our HFD/STZ protocol induced (1) mechanical hyperalgesia and depression-like behaviors, (2) loss of intraepidermal nerve fibers (IENFs) and reduced axonal diameters in sural nerves, and (3) decreased compound muscle action potential. In addition to hyperglycemia, which was correlated with the degree of mechanical hyperalgesia and loss of IENFs, we observed that hypertriglyceridemia was the most dominant deficit in the lipid profiles of the diabetic rats. In particular, SEPT9, the fourth component of the cytoskeleton, increased in the satellite glial cells (SGCs) of the dorsal root ganglia (DRG) in the T2DM-like rats. The number of SEPT9(+) SGCs/DRG was correlated with serum glucose levels and mechanical thresholds. Our findings indicate the putative molecular mechanism underlying DPN, which presumably involves the interaction of SGCs and DRG neurons; nevertheless, further functional research is warranted to clarify the role of SEPT9 in DPN.
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Affiliation(s)
- Hung-Wei Kan
- School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan
- Correspondence: (H.-W.K.); (Y.-L.H.); Tel.: +886-7-6151100 (H.-W.K.); +886-7-3121101 (Y.-L.H.)
| | - Yu-Cheng Ho
- School of Medicine, College of Medicine, I-Shou University, Kaohsiung 82445, Taiwan
| | - Ying-Shuang Chang
- Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Yu-Lin Hsieh
- Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
- School of Post-Baccalaureate Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan
- Correspondence: (H.-W.K.); (Y.-L.H.); Tel.: +886-7-6151100 (H.-W.K.); +886-7-3121101 (Y.-L.H.)
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Singh S, Winkelstein BA. Inhibiting the β1integrin subunit increases the strain threshold for neuronal dysfunction under tensile loading in collagen gels mimicking innervated ligaments. Biomech Model Mechanobiol 2022; 21:885-898. [DOI: 10.1007/s10237-022-01565-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Accepted: 02/13/2022] [Indexed: 11/28/2022]
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Kan HW, Chang CH, Chang YS, Ko YT, Hsieh YL. Genetic loss-of-function of activating transcription factor 3 but not C-type lectin member 5A prevents diabetic peripheral neuropathy. J Transl Med 2021; 101:1341-1352. [PMID: 34172832 PMCID: PMC8440213 DOI: 10.1038/s41374-021-00630-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 06/15/2021] [Accepted: 06/15/2021] [Indexed: 12/16/2022] Open
Abstract
We investigated the mediating roles of activating transcription factor 3 (ATF3), an injury marker, or C-type lectin member 5A (CLEC5A), an inflammatory response molecule, in the induction of endoplasmic reticulum (ER) stress and neuroinflammation in diabetic peripheral neuropathy in ATF3 and CLEC5A genetic knockout (aft3-/- and clec5a-/-, respectively) mice. ATF3 was expressed intranuclearly and was upregulated in mice with diabetic peripheral neuropathy (DN) and clec5a-/- mice. The DN and clec5a-/- groups also exhibited neuropathic behavior, but not in the aft3-/- group. The upregulation profiles of cytoplasmic polyadenylation element-binding protein, a protein translation-regulating molecule, and the ER stress-related molecules of inositol-requiring enzyme 1α and phosphorylated eukaryotic initiation factor 2α in the DN and clec5a-/- groups were correlated with neuropathic behavior. Ultrastructural evidence confirmed ER stress induction and neuroinflammation, including microglial enlargement and proinflammatory cytokine release, in the DN and clec5a-/- mice. By contrast, the induction of ER stress and neuroinflammation did not occur in the aft3-/- mice. Furthermore, the mRNA of reactive oxygen species-removing enzymes such as superoxide dismutase, heme oxygenase-1, and catalase were downregulated in the DN and clec5a-/- groups but were not changed in the aft3-/- group. Taken together, the results indicate that intraneuronal ATF3, but not CLEC5A, mediates the induction of ER stress and neuroinflammation associated with diabetic neuropathy.
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Affiliation(s)
- Hung-Wei Kan
- School of Medicine for International Students, College of Medicine, I-Shou University, Kaohsiung, Taiwan
| | - Chin-Hong Chang
- Department of Surgery, Chi Mei Medical Center, Tainan, Taiwan
| | - Ying-Shuang Chang
- Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yi-Ting Ko
- Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yu-Lin Hsieh
- Department of Anatomy, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
- School of Post-Baccalaureate Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
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Comparative Transcriptome Profiling Reveals Changes of microRNAs Response to Exercise in Rats with Neuropathic Pain. Neural Plast 2021; 2021:5597139. [PMID: 34394340 PMCID: PMC8356008 DOI: 10.1155/2021/5597139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 06/24/2021] [Accepted: 07/16/2021] [Indexed: 11/18/2022] Open
Abstract
There is accumulating evidence showing that exercise therapy may play an active role in peripheral neuropathic pain (NP), but its mechanism is still unclear. Studies have found that microRNAs (miRNAs) may play a role in NP by regulating pain-related target genes. Therefore, we aimed to explore the changes of miRNA and mRNA of dorsal root ganglion (DRG) after NP in response to exercise with transcriptome technology. The chronic constriction injury (CCI) model was established, and rats were randomly allocated into three groups, namely, the sham-operated, CCI, and CCI-exercised groups. L4-L6 DRG tissue was taken for RNA-sequencing, and the differentially expressed genes (DEGs) were determined through bioinformatics analysis. Real-time PCR was used to confirm the accuracy. A total of 4 overlapping differentially expressed miRNAs and 186 overlapping differentially expressed mRNAs were identified in the two comparisons of the sham-operated group versus the CCI group and the CCI group versus the CCI-exercised group. Among these DEGs, miR-145-5p, miR-341, miR-300-5p, miR-653-5p, Atf3, Cacna2d1, Gal, and Ctss related to NP were validated by real-time PCR. DEGs between the CCI and CCI-exercised groups were enriched in HIF-1 signaling pathway, Rap1 signaling pathway, and neurotrophin signaling pathway. This study provides an understanding of the adaptive mechanisms after exercise of NP, and these DEGs in DRG might play a role in NP by stimulating the enriched pathways.
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Sood A, Kumar B, Singh SK, Prashar P, Gautam A, Gulati M, Pandey NK, Melkani I, Awasthi A, Saraf SA, Vidari G, Ozdemir M, Hussain FHS, Anwar ET, Ameen MSM, Gupta S, Porwal O. Flavonoids as Potential Therapeutic Agents for the Management of Diabetic Neuropathy. Curr Pharm Des 2020; 26:5468-5487. [DOI: 10.2174/1381612826666200826164322] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 07/27/2020] [Indexed: 12/22/2022]
Abstract
Flavonoids are secondary metabolites that are widely distributed in plants. These phenolic compounds
are classified into various subgroups based on their structures: flavones, flavonols, isoflavones, flavanones, and
anthocyanins. They are known to perform various pharmacological actions like antioxidant, anti-inflammatory,
anticancer, antimicrobial, antidiabetic and antiallergic, etc. Diabetes is a chronic progressive metabolic disorder
that affects several biochemical pathways and leads to secondary complications such as neuropathy, retinopathy,
nephropathy, and cardiomyopathy. Among them, the management of diabetic neuropathy is one of the major
challenges for physicians as well as the pharmaceutical industries. Naturally occurring flavonoids are extensively
used for the treatment of diabetes and its related complications due to their antioxidant properties. Moreover,
flavonoids inhibit various pathways that are involved in the progression of diabetic neuropathy like the reduction
of oxidative stress, decrease in glycogenolysis, increase glucose utilization, decrease in the formation of advanced
glycation end products, and inhibition of the α-glucosidase enzyme. This review entails current updates on the
therapeutic perspectives of flavonoids in the treatment of neuropathic pain. This manuscript explains the pathological
aspects of neuropathic pain, the chemistry of flavonoids, and their application in amelioration of neuropathic
pain through preclinical studies either alone or in combination with other therapeutic agents.
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Affiliation(s)
- Ankita Sood
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Bimlesh Kumar
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Sachin Kumar Singh
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Pankaj Prashar
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Anamika Gautam
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Monica Gulati
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Narendra Kumar Pandey
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Indu Melkani
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Ankit Awasthi
- School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Subhini A Saraf
- Department of Pharmaceutical Sciences, School of Bioscience and Biotechnology, Babasaheb Bhimrao Ambedkar University, Lucknow, Uttar Pradesh 226025, India
| | - Giovani Vidari
- Department of Chemistry, University of Pavia, 27100 Pavia, Italy
| | - Mehmet Ozdemir
- Department of Densitry, Tishk International University- Erbil, Kurdistan Region, Iraq
| | | | - Esra Tariq Anwar
- Department of Pharmacy, Tishk International University-Erbil, Kurdistan Region, Iraq
| | | | - Saurabh Gupta
- Department of Pharmacology, Chitkara University, Rajpura, Punjab, India
| | - Omji Porwal
- Department of Pharmacy, Tishk International University-Erbil, Kurdistan Region, Iraq
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Lysophosphatidic Acid Receptor 1- and 3-Mediated Hyperalgesia and Hypoalgesia in Diabetic Neuropathic Pain Models in Mice. Cells 2020; 9:cells9081906. [PMID: 32824296 PMCID: PMC7465054 DOI: 10.3390/cells9081906] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/08/2020] [Accepted: 08/13/2020] [Indexed: 12/28/2022] Open
Abstract
Lysophosphatidic acid (LPA) signaling is known to play key roles in the initiation and maintenance of various chronic pain models. Here we examined whether LPA signaling is also involved in diabetes-induced abnormal pain behaviors. The high-fat diet (HFD) showing elevation of blood glucose levels and body weight caused thermal, mechanical hyperalgesia, hypersensitivity to 2000 or 250 Hz electrical-stimulation and hyposensitivity to 5 Hz stimulation to the paw in wild-type (WT) mice. These HFD-induced abnormal pain behaviors and body weight increase, but not elevated glucose levels were abolished in LPA1−/− and LPA3−/− mice. Repeated daily intrathecal (i.t.) treatments with LPA1/3 antagonist AM966 reversed these abnormal pain behaviors. Similar abnormal pain behaviors and their blockade by daily AM966 (i.t.) or twice daily Ki16425, another LPA1/3 antagonist was also observed in db/db mice which show high glucose levels and body weight. Furthermore, streptozotocin-induced similar abnormal pain behaviors, but not elevated glucose levels or body weight loss were abolished in LPA1−/− and LPA3−/− mice. These results suggest that LPA1 and LPA3 play key roles in the development of both type I and type II diabetic neuropathic pain.
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