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Shinouchi R, Shibata K, Hashimoto T, Jono S, Hasumi K, Nobe K. SMTP-44D improves diabetic neuropathy symptoms in mice through its antioxidant and anti-inflammatory activities. Pharmacol Res Perspect 2020; 8:e00648. [PMID: 33215875 PMCID: PMC7677968 DOI: 10.1002/prp2.648] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 07/21/2020] [Accepted: 07/27/2020] [Indexed: 01/28/2023] Open
Abstract
Diabetic neuropathy (DN) is one of the major complications of diabetes. However, there are few approved effective therapies for painful or insensate DN. Recent studies have implicated oxidative stress and inflammation in the pathogenesis of DN, and suppressing these could be an important therapeutic strategy. We previously reported that Stachybotrys microspora triprenyl phenol-44D (SMTP-44D) exhibits both antioxidant and anti-inflammatory activities. The aim of this study was to evaluate the effects of SMTP-44D in a mouse model of streptozotocin-induced DN. SMTP-44D was administered for 3 weeks after the disease induction, and its effects were evaluated on the basis of mechanical and thermal thresholds, blood flow in the bilateral hind paw, and blood flow and conduction velocity in the sciatic nerve. Furthermore, the levels of inflammatory factors, such as tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6 and malondialdehyde (MDA), in the sciatic nerve were assessed. Neurological degeneration was assessed by measuring myelin thickness and g-ratio in the sciatic nerve. SMTP-44D treatment significantly improved allodynia, hyperalgesia, blood flow, and conduction velocity in DN model mice in a dose-dependent manner. Neurological degeneration was also significantly improved, accompanied by decreased levels of inflammatory factors (TNF-α, 57.8%; IL-1β, 51.4%; IL-6, 62.8%; and MDA, 40.7% reduction rate against the diabetes mellitus + normal saline group). Thus, SMTP-44D can improve allodynia and hyperalgesia in DN without affecting the body weight and blood glucose levels, which may be due to its antioxidant and anti-inflammatory properties. In conclusion, SMTP-44D could be a potential therapeutic agent for the treatment of DN.
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Affiliation(s)
- Ryosuke Shinouchi
- Division of PharmacologyDepartment of Pharmacology, Toxicology & TherapeuticsSchool of PharmacyShowa UniversityShinagawa‐kuTokyoJapan
- Pharmacology Research CenterShowa UniversityShinagawa‐kuTokyoJapan
| | - Keita Shibata
- Division of PharmacologyDepartment of Pharmacology, Toxicology & TherapeuticsSchool of PharmacyShowa UniversityShinagawa‐kuTokyoJapan
- Pharmacology Research CenterShowa UniversityShinagawa‐kuTokyoJapan
| | - Terumasa Hashimoto
- Division of PharmacologyDepartment of Pharmacology, Toxicology & TherapeuticsSchool of PharmacyShowa UniversityShinagawa‐kuTokyoJapan
- Pharmacology Research CenterShowa UniversityShinagawa‐kuTokyoJapan
| | - Shiori Jono
- Division of PharmacologyDepartment of Pharmacology, Toxicology & TherapeuticsSchool of PharmacyShowa UniversityShinagawa‐kuTokyoJapan
- Pharmacology Research CenterShowa UniversityShinagawa‐kuTokyoJapan
| | - Keiji Hasumi
- Department of Applied Biological ScienceTokyo University of Agriculture and TechnologyFuchu‐shiTokyoJapan
- TMS Co., LtdFuchu‐shiTokyoJapan
| | - Koji Nobe
- Division of PharmacologyDepartment of Pharmacology, Toxicology & TherapeuticsSchool of PharmacyShowa UniversityShinagawa‐kuTokyoJapan
- Pharmacology Research CenterShowa UniversityShinagawa‐kuTokyoJapan
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2
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Khaleghzadeh-Ahangar H, Sadeghimahalli F, Khandan S, Shahabi S, Moghadamnia A. Insulin within the Arcuate Nucleus Has Paradoxical Effects on Nociception in Healthy and Diabetic Rats. Basic Clin Neurosci 2020; 11:727-736. [PMID: 33850610 PMCID: PMC8019850 DOI: 10.32598/bcn.11.6.1983.1] [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: 08/11/2019] [Revised: 09/15/2019] [Accepted: 11/08/2019] [Indexed: 11/20/2022] Open
Abstract
Introduction Broad neural circuits originate from the hypothalamic arcuate nucleus and project to many parts of the brain which are related to pain perception. Insulin receptors are found in the arcuate nucleus. Since nociception may be affected in type 1 diabetes, the present study aimed to investigate the intra-arcuate nucleus insulin role in pain perception in streptozotocin (STZ)-induced diabetic and healthy rats. Methods Regular insulin was microinjected within the arcuate nucleus and the pain tolerance was measured using the hot plate and the tail-flick apparatus in diabetic rats. Results The results showed that the arcuate nucleus suppression with lidocaine could increase thermal nociception in non-diabetic animals. Also, insulin within the arcuate nucleus decreased the acute thermal pain perception in these animals. STZ-induced diabetes produced hypoalgesia which the latency of these tests, progressively increased over time after induction of diabetes. Also, in the same animal group, intra-arcuate injection of insulin reduced the latency of nociception. Conclusion Intra-arcuate insulin has paradoxical and controversial effects in healthy and diabetic rats' nociception. These effects seem to be due to the insulin effect on releasing proopiomelanocortin and its derivatives.
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Affiliation(s)
- Hossein Khaleghzadeh-Ahangar
- Department of Physiology, School of Medicine, Babol University of Medical Sciences, Babol, Iran.,Neuroscience Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Forouzan Sadeghimahalli
- Departement of Physiology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Shaghayegh Khandan
- Neuroscience Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Sima Shahabi
- Department of Physiology, School of Medicine, Babol University of Medical Sciences, Babol, Iran.,Neuroscience Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Aliakbar Moghadamnia
- Neuroscience Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran.,Department of Pharmacology, School of Medicine, Babol University of Medical Sciences, Babol, Iran
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3
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Eid SA, El Massry M, Hichor M, Haddad M, Grenier J, Dia B, Barakat R, Boutary S, Chanal J, Aractingi S, Wiesel P, Szyndralewiez C, Azar ST, Boitard C, Zaatari G, Eid AA, Massaad C. Targeting the NADPH Oxidase-4 and Liver X Receptor Pathway Preserves Schwann Cell Integrity in Diabetic Mice. Diabetes 2020; 69:448-464. [PMID: 31882567 DOI: 10.2337/db19-0517] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 12/15/2019] [Indexed: 11/13/2022]
Abstract
Diabetes triggers peripheral nerve alterations at a structural and functional level, collectively referred to as diabetic peripheral neuropathy (DPN). This work highlights the role of the liver X receptor (LXR) signaling pathway and the cross talk with the reactive oxygen species (ROS)-producing enzyme NADPH oxidase-4 (Nox4) in the pathogenesis of DPN. Using type 1 diabetic (T1DM) mouse models together with cultured Schwann cells (SCs) and skin biopsies from patients with type 2 diabetes (T2DM), we revealed the implication of LXR and Nox4 in the pathophysiology of DPN. T1DM animals exhibit neurophysiological defects and sensorimotor abnormalities paralleled by defective peripheral myelin gene expression. These alterations were concomitant with a significant reduction in LXR expression and increase in Nox4 expression and activity in SCs and peripheral nerves, which were further verified in skin biopsies of patients with T2DM. Moreover, targeted activation of LXR or specific inhibition of Nox4 in vivo and in vitro to attenuate diabetes-induced ROS production in SCs and peripheral nerves reverses functional alteration of the peripheral nerves and restores the homeostatic profiles of MPZ and PMP22. Taken together, our findings are the first to identify novel, key mediators in the pathogenesis of DPN and suggest that targeting LXR/Nox4 axis is a promising therapeutic approach.
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Affiliation(s)
- Stéphanie A Eid
- Department of Anatomy, Cell Biology and Physiological Sciences, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
- INSERM UMR 1124, University Paris Descartes, Faculty of Basic and Biomedical Sciences, Paris, France
| | - Mohamed El Massry
- Department of Anatomy, Cell Biology and Physiological Sciences, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
- INSERM UMR 1124, University Paris Descartes, Faculty of Basic and Biomedical Sciences, Paris, France
| | - Mehdi Hichor
- INSERM UMR 1124, University Paris Descartes, Faculty of Basic and Biomedical Sciences, Paris, France
| | - Mary Haddad
- Department of Anatomy, Cell Biology and Physiological Sciences, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
| | - Julien Grenier
- INSERM UMR 1124, University Paris Descartes, Faculty of Basic and Biomedical Sciences, Paris, France
| | - Batoul Dia
- Department of Anatomy, Cell Biology and Physiological Sciences, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
| | - Rasha Barakat
- Department of Anatomy, Cell Biology and Physiological Sciences, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
- INSERM U1016, Cochin Institute, University Paris Descartes, Faculty of Medicine, Sorbonne Paris Cité, Paris, France
| | - Suzan Boutary
- Department of Anatomy, Cell Biology and Physiological Sciences, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
| | - Johan Chanal
- INSERM U1016, Cochin Institute, University Paris Descartes, Faculty of Medicine, Sorbonne Paris Cité, Paris, France
| | - Selim Aractingi
- INSERM U1016, Cochin Institute, University Paris Descartes, Faculty of Medicine, Sorbonne Paris Cité, Paris, France
| | | | | | - Sami T Azar
- Department of Internal Medicine, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
- AUB Diabetes, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
| | - Christian Boitard
- INSERM U1016, Cochin Institute, University Paris Descartes, Faculty of Medicine, Sorbonne Paris Cité, Paris, France
| | - Ghazi Zaatari
- Department of Pathology, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
| | - Assaad A Eid
- Department of Anatomy, Cell Biology and Physiological Sciences, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
- AUB Diabetes, American University of Beirut, Faculty of Medicine and Medical Center, Beirut, Lebanon
| | - Charbel Massaad
- INSERM UMR 1124, University Paris Descartes, Faculty of Basic and Biomedical Sciences, Paris, France
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4
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Wang R, Wang L, Zhang C, Zhang Y, Liu Y, Song L, Ma R, Dong J. L-carnitine ameliorates peripheral neuropathy in diabetic mice with a corresponding increase in insulin‑like growth factor‑1 level. Mol Med Rep 2018; 19:743-751. [PMID: 30431101 DOI: 10.3892/mmr.2018.9647] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 10/22/2018] [Indexed: 11/05/2022] Open
Abstract
Diabetic peripheral neuropathy (DPN) is one of the common complications in diabetes, affecting more than half of patients with diabetes. L‑carnitine (LC) was recently demonstrated to serve a positive role in ameliorating DPN. Therefore, the aim of the present study was to investigate the underlying mechanisms of LC in ameliorating DPN. Male Kunming mice were randomly assigned into five groups, including the control group, diabetes mellitus group, pre‑treatment group, treatment group and post‑treatment group. Type 2 diabetes was induced in mice using a combination of high‑fat diet and streptozotocin injection. Subsequently, peripheral neuropathy was measured and the levels of LC, insulin and insulin‑like growth factor‑1 (IGF‑1) were detected. When diabetic mice were treated with LC, the levels of IGF‑1 in the plasma and pancreas were increased. In addition, hyperalgesia, as determined by the tail‑flick test as well as food intake, body weight and blood glucose levels were decreased. An amelioration of demyelination, axonal atrophy and mitochondria swelling in the nerve fibres of diabetic mice was also observed. The present study demonstrated that LC ameliorated peripheral neuropathy in type 2 diabetic mice and the effect of LC may in part be mediated by an increase in local and circulatory IGF‑1 levels.
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Affiliation(s)
- Rui Wang
- Department of Special Medicine, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Liuxin Wang
- Department of Special Medicine, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Caishun Zhang
- Department of Special Medicine, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Yan Zhang
- Department of Nephrology, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Yuan Liu
- Department of Special Medicine, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Limin Song
- Department of Special Medicine, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
| | - Ruixia Ma
- Department of Nephrology, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China
| | - Jing Dong
- Department of Physiology, Medical College, Qingdao University, Qingdao, Shandong 266071, P.R. China
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5
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Zychowska M, Rojewska E, Pilat D, Mika J. The role of some chemokines from the CXC subfamily in a mouse model of diabetic neuropathy. J Diabetes Res 2015; 2015:750182. [PMID: 25789329 PMCID: PMC4350880 DOI: 10.1155/2015/750182] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Revised: 01/28/2015] [Accepted: 01/29/2015] [Indexed: 12/11/2022] Open
Abstract
The mechanism involved in the development of diabetic neuropathy is complex. Currently, it is thought that chemokines play an important role in this process. The aim of this study was to determine how the level of some chemokines from the CXC subfamily varies in diabetic neuropathy and how the chemokines affect nociceptive transmission. A single intraperitoneal (i.p.) injection of streptozotocin (STZ; 200 mg/kg) resulted in an increased plasma glucose. The development of allodynia and hyperalgesia was measured at day 7 after STZ administration. Using Antibody Array techniques, the increases in CXCL1 (KC), CXCL5 (LIX), CXCL9 (MIG), and CXCL12 (SDF-1) protein levels were detected in STZ-injected mice. No changes in CXCL11 (I-TAC) or CXCL13 (BLC) protein levels were observed. The single intrathecal (i.t.) administration of CXCL1, CXCL5, CXCL9, and CXCL12 (each in doses of 10, 100, and 500 ng/5 μL) shows their pronociceptive properties as measured 1, 4, and 24 hours after injection using the tail-flick, von Frey, and cold plate tests. These findings indicate that the chemokines CXCL1, CXCL5, CXCL9, and CXCL12 are important in nociceptive transmission and may play a role in the development of diabetic neuropathy.
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Affiliation(s)
- Magdalena Zychowska
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland
| | - Ewelina Rojewska
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland
| | - Dominika Pilat
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland
| | - Joanna Mika
- Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna Street, 31-343 Krakow, Poland
- *Joanna Mika:
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6
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Becker M, Benromano T, Shahar A, Nevo Z, Pick CG. Changes in the basal membrane of dorsal root ganglia Schwann cells explain the biphasic pattern of the peripheral neuropathy in streptozotocin-induced diabetic rats. J Mol Neurosci 2014; 54:704-13. [PMID: 25260693 DOI: 10.1007/s12031-014-0424-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 09/11/2014] [Indexed: 10/24/2022]
Abstract
Peripheral neuropathy is one of the main complications of diabetes mellitus. The current study demonstrated the bimodal pattern of diabetic peripheral neuropathy found in the behavioral study of pain perception in parallel to the histopathological findings in dorsal root ganglia (DRGs) neurons and satellite Schwann cell basement membranes. A gradual decrease in heparan sulfate content, with a reciprocal increase in deposited laminin in the basement membranes of dorsal root ganglia Schwann cells, was shown in streptozotocin-treated rats. In addition, the characteristic biphasic pain profiles were demonstrated in diabetic rats, as shown by hypersensitivity at the third week and hyposensitivity at the tenth week post-streptozotocin injection, accompanied by a continuous decrease in the sciatic nerve conduction velocity. It appears that these basal membrane abnormalities in content of heparan sulfate and laminin, noticed in diabetic rats, may underline the primary damage in dorsal ganglion sensory neurons, simultaneously with the bimodal painful profile in diabetic peripheral neuropathy, simulating the scenario of filtration rate in diabetic kidney.
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Affiliation(s)
- Maria Becker
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, University of Tel Aviv, Tel Aviv, 69978, Israel
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7
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Tanaka KI, Nakanishi Y, Sekino S, Ikegami M, Ikeda H, Kamei J. Fentanyl produces an anti-hyperalgesic effect through the suppression of sodium channels in mice with painful diabetic neuropathy. Eur J Pharmacol 2014; 733:68-74. [DOI: 10.1016/j.ejphar.2014.03.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 03/17/2014] [Accepted: 03/24/2014] [Indexed: 11/30/2022]
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8
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Ulugol A, Oltulu C, Gunduz O, Citak C, Carrara R, Shaqaqi MR, Sanchez AM, Dogrul A. 5-HT7 receptor activation attenuates thermal hyperalgesia in streptozocin-induced diabetic mice. Pharmacol Biochem Behav 2012; 102:344-8. [PMID: 22609798 DOI: 10.1016/j.pbb.2012.05.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 04/27/2012] [Accepted: 05/12/2012] [Indexed: 11/27/2022]
Abstract
The role of 5-HT7 receptors in the nociceptive processing received most attention during the last few years. The involvement of 5-HT₇ receptors in nerve injury-induced neuropathic pain states have been reported only recently; however, there are no reports on its contribution in diabetic neuropathic pain. We therefore planned to investigate the effect of 5-HT₇ receptor activation on the changes of nociceptive threshold in diabetic mice. Diabetes was induced by a single intraperitoneal injection of streptozocin (150 mg/kg, i.p.). The nociceptive responses in normal and diabetic animals were tested in the hot-plate and tail-flick assays. Both hot-plate and tail-flick latencies significantly shortened at 1-3/4 weeks (thermal hyperalgesia) and prolonged at 6-7 weeks (thermal hypoalgesia) after streptozocin administration. At the dose of 10 mg/kg, systemic injections of AS-19, a selective 5-HT₇ receptor agonist, reduced thermal hyperalgesia at early stage of diabetes, but did not influence thermal hypoalgesia at late stage. Co-administration of SB-258719, a selective 5-HT₇ receptor antagonist, at a dose that had no effect on its own (10 mg/kg), reversed the anti-hyperalgesic effect of AS-19. Our results indicate that systemic administration of 5-HT₇ receptor agonists may have clinical utility in treating diabetic neuropathic pain.
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Affiliation(s)
- Ahmet Ulugol
- Department of Medical Pharmacology, Faculty of Medicine, Trakya University, 22030-Edirne, Turkey.
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9
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Vera G, López-Miranda V, Herradón E, Martín MI, Abalo R. Characterization of cannabinoid-induced relief of neuropathic pain in rat models of type 1 and type 2 diabetes. Pharmacol Biochem Behav 2012; 102:335-43. [PMID: 22609797 DOI: 10.1016/j.pbb.2012.05.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Revised: 04/21/2012] [Accepted: 05/12/2012] [Indexed: 10/28/2022]
Abstract
Diabetic neuropathy is a frequent complication of diabetes mellitus with a tremendous impact on patients' quality of life, and it remains poorly treated. Cannabinoids relieve the signs of diabetic neuropathy in different experimental models, including streptozotocin- (STZ-) induced type 1 diabetic rodents, and they may also relieve neuropathic signs in type 2 diabetic animals. This study compares the effect of the non-selective cannabinoid agonist WIN 55,212-2 (WIN) in Zucker Diabetic Fatty (ZDF) rats (type 2 diabetes) and in STZ-injected Wistar rats (type 1 diabetes). WIN (or its vehicle) was either systemically administered at a non-psychoactive dose or locally injected. Selective CB1 and CB2 cannabinoid antagonists were used to characterize WIN antineuropathic effects. Both type 1 and type 2 diabetic rats showed mechanical allodynia but not thermal hyperalgesia. WIN alleviated mechanical allodynia in both models of diabetes. In STZ-treated rats, both cannabinoid receptors were involved, whereas in ZDF rats, WIN effects seemed to mainly involve the activation of CB1 receptors. Higher doses of WIN were needed to significantly relieve mechanical allodynia upon intraplantar administration in ZDF vs. STZ-injected rats. Cannabinoids, acting on systemic and/or peripheral receptors, may serve as a new therapeutic alternative for symptom management in painful neuropathy associated with both type 1 and type 2 diabetes. Additionally, our results highlight the need for appropriate selection of diabetic experimental models because the results from studies in STZ-induced diabetic rodents might not be applicable in all diabetic situations.
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Affiliation(s)
- Gema Vera
- Departamento de Farmacología y Nutrición, Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos., Avda. de Atenas s/n, 28922 Alcorcón, Madrid, Spain
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10
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Hwang HS, Yang EJ, Lee SM, Lee SC, Choi SM. Antiallodynic Effects of Electroacupuncture Combined with MK-801 Treatment through the Regulation of p35/p25 in Experimental Diabetic Neuropathy. Exp Neurobiol 2011; 20:144-52. [PMID: 22110373 PMCID: PMC3214771 DOI: 10.5607/en.2011.20.3.144] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2011] [Accepted: 06/28/2011] [Indexed: 11/29/2022] Open
Abstract
The anti-allodynic effect of NMDA receptor antagonist and acupuncture treatments were explored through spinal p35 regulation of diabetic neuropathic rat. We evaluated the change over time of p35/p25 protein levels in the spinal cord compared with behavioral responses to thermal and mechanical stimulation in streptozotocin (STZ)-induced diabetic rats. Additionally, we studied p35 expression when electroacupuncture (EA) and a sub-effective dose of NMDA (N-methyl-D-aspartate) receptor antagonist (MK-801) were used to treat hyperalgesia in the diabetic neuropathic pain (DNP). Thermal paw withdrawal latency (PWL) and mechanical paw withdrawal threshold (PWT) were significantly decreased in the early stage of diabetes in rats. p35 expression after STZ injection gradually decreased from 1 week to 4 weeks compared to normal controls. p25 expression in 4-week diabetic rats was significantly higher than that of 2-week diabetic rats, and thermal PWL in 4-week diabetic rats showed delayed responses to painful thermal stimulation compared with those at 2 weeks. EA applied to the SP-9 point (2 Hz frequency) significantly prevented the thermal and mechanical hyperalgesia in the DNP rat. Additionally, EA combined with MK-801 prolonged anti-hyperalgesia, increased p35 expression, and decreased the cleavage of p35 to p25 during diabetic neuropathic pain. In this study we show EA combined with a sub-effective dose of MK-801 treatment in DNP induced by STZ that is related to p35/p25 expression in spinal cord.
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Affiliation(s)
- Hye Suk Hwang
- Division of Standard Research, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea
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Abstract
OBJECTIVES This is a review of emerging interventions from the recent preclinical and clinical literature that demonstrate the potential for effectiveness in the therapy of diabetic neuropathy (DN). DN is the most common complication of diabetes mellitus and up to 50% of patients with type 1 and type 2 forms have some or other form of neuropathy. The pathology of DN is characterized by progressive nerve fibre loss that gives rise to positive and negative clinical signs and symptoms such as pain, paraesthesiae and loss of sensation. KEY FINDINGS There are very few drugs available to directly treat DN. Those that are clinically indicated provide symptomatic relief but do not repair or reverse underlying nerve damage. However, some agents are in clinical development that may support adult neurons and direct reparative processes after injury stages. Several disease modifying drugs such as aldose reductase inhibitors and protein kinase C inhibitors are in phase III development. Agents on the horizon include neurotrophic factors, growth factors, gene therapy, immunotherapy, poly(ADP-ribose) polymerase inhibitors and non-immunosuppressive immunophilin ligands. SUMMARY Progress has been made toward understanding the biochemical mechanisms leading to diabetic neuropathy, and as a result, new treatment modalities are being explored. The pathogenesis, types and approaches for treating DN together with the newer therapeutic interventions on the horizon are discussed.
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Affiliation(s)
- Danish Mahmood
- Department of Pharmacology, Hamdard University, Hamdard Nagar, New Delhi 110062, India
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Bordet T, Pruss RM. Targeting neuroprotection as an alternative approach to preventing and treating neuropathic pain. Neurotherapeutics 2009; 6:648-62. [PMID: 19789070 PMCID: PMC5084287 DOI: 10.1016/j.nurt.2009.07.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2009] [Accepted: 07/08/2009] [Indexed: 11/29/2022] Open
Abstract
Neuropathic pain syndromes arise from dysfunction of the nerve itself, through traumatic or nontraumatic injury. Unlike acute pain syndromes, the pain is long-lasting and does not respond to common analgesic therapies. Drugs that disrupt nerve conduction and transmission or central sensitization, currently the only effective treatments, are only modestly effective for a portion of the patients suffering from neuropathic pain and come with the cost of serious adverse effects. Neurodegeneration, as a reaction to nerve trauma or chronic metabolic or chemical intoxication, appears to be an underlying cause of neuropathic pain. Identifying mechanisms of neurodegeneration and designing neuroprotective therapies is an ambitious goal toward treating or even preventing the development of these disabling disorders.
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Affiliation(s)
- Thierry Bordet
- Trophos, Parc Scientifique de Luminy, Luminy Biotech Entreprises, Case 931, 13288 Marseille Cedex 9, France
| | - Rebecca M. Pruss
- Trophos, Parc Scientifique de Luminy, Luminy Biotech Entreprises, Case 931, 13288 Marseille Cedex 9, France
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13
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Zhang Z, Zhao M, Li Q, Zhao H, Wang J, Li Y. Acetyl-l-carnitine inhibits TNF-alpha-induced insulin resistance via AMPK pathway in rat skeletal muscle cells. FEBS Lett 2008; 583:470-4. [PMID: 19121314 DOI: 10.1016/j.febslet.2008.12.053] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2008] [Revised: 12/08/2008] [Accepted: 12/20/2008] [Indexed: 11/26/2022]
Abstract
In this study, we demonstrated effects of acetyl-l-carnitine (ALC) on insulin resistance induced by tumor necrosis factor-alpha (TNF-alpha) in rat L6 cells. TNF-alpha downregulated insulin-stimulated glucose uptake and increased Serine 307 phosphorylation of insulin receptor substrate-1 (IRS-1). However, the treatment of ALC improved insulin-stimulated glucose uptake via AMP-activated protein kinase (AMPK) activation in a dose-dependent manner. Together, our data suggest that ALC inhibits TNF-alpha-induced insulin resistance through AMPK pathway in skeletal muscle cells.
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Affiliation(s)
- Zhaofeng Zhang
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, Beijing 100191, PR China
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Kamei J, Ohsawa M, Miyata S, Tanaka SI. Preventive effect of l-carnosine on changes in the thermal nociceptive threshold in streptozotocin-induced diabetic mice. Eur J Pharmacol 2008; 600:83-6. [DOI: 10.1016/j.ejphar.2008.10.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Revised: 09/12/2008] [Accepted: 10/01/2008] [Indexed: 10/21/2022]
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Kamei J, Ohsawa M, Miyata S, Endo K, Hayakawa H. Effects of cytidine 5'-diphosphocholine (CDP-choline) on the thermal nociceptive threshold in streptozotocin-induced diabetic mice. Eur J Pharmacol 2008; 598:32-6. [PMID: 18834878 DOI: 10.1016/j.ejphar.2008.09.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2008] [Revised: 09/01/2008] [Accepted: 09/10/2008] [Indexed: 01/26/2023]
Abstract
Neuropathy accompanied by abnormal sensory perception is the most common complication in insulin-dependent and -independent diabetes mellitus. Since there are very few effective therapeutic regimens for sensory abnormalities in diabetes, we examined the effect of cytidine 5'-diphosphocholine (CDP)-choline on the thermal nociceptive threshold in streptozotocin-induced diabetic mice using the tail-flick test. Diabetic mice showed a shorter tail-flick latency at 1-4 weeks after streptozotocin treatment and a longer tail-flick latency after 8-12 weeks. This hyper- and hypoalgesia in diabetic mice was almost completely inhibited by daily treatment with CDP-choline (100 mg/kg/day, p.o.) beginning on the day of streptozotocin treatment. Daily treatment with CDP-choline beginning 5 weeks after streptozotocin treatment attenuated the development of hypoalgesia. Diabetic mice showed a significant increase in Na(+)-K(+)-ATPase activity at 3 weeks after streptozotocin treatment, whereas Na(+)-K(+)-ATPase activity was decreased at 12 weeks after treatment. These alterations were normalized by daily treatment with CDP-choline (100 mg/kg/day, p.o.) beginning the day of streptozotocin treatment. These results provide evidence to support the therapeutic potency of CDP-choline on the development of thermal hyper- and hypoalgesia and the progression of thermal hypoalgesia in diabetic mice. Moreover, these effects of CDP-choline may result from the normalization of Na(+)-K(+)-ATPase activity.
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Affiliation(s)
- Junzo Kamei
- Department of Pathophysiology and Therapeutics, School of Pharmacy and Pharmaceutical Sciences, Hoshi University, Tokyo 142-8501, Japan.
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