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Miyashita A, Kobayashi M, Yokota T, Zochodne DW. Diabetic Polyneuropathy: New Strategies to Target Sensory Neurons in Dorsal Root Ganglia. Int J Mol Sci 2023; 24:ijms24065977. [PMID: 36983051 PMCID: PMC10051459 DOI: 10.3390/ijms24065977] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 03/10/2023] [Accepted: 03/11/2023] [Indexed: 03/29/2023] Open
Abstract
Diabetic polyneuropathy (DPN) is the most common type of diabetic neuropathy, rendering a slowly progressive, symmetrical, and length-dependent dying-back axonopathy with preferential sensory involvement. Although the pathogenesis of DPN is complex, this review emphasizes the concept that hyperglycemia and metabolic stressors directly target sensory neurons in the dorsal root ganglia (DRG), leading to distal axonal degeneration. In this context, we discuss the role for DRG-targeting gene delivery, specifically oligonucleotide therapeutics for DPN. Molecules including insulin, GLP-1, PTEN, HSP27, RAGE, CWC22, and DUSP1 that impact neurotrophic signal transduction (for example, phosphatidylinositol-3 kinase/phosphorylated protein kinase B [PI3/pAkt] signaling) and other cellular networks may promote regeneration. Regenerative strategies may be essential in maintaining axon integrity during ongoing degeneration in diabetes mellitus (DM). We discuss specific new findings that relate to sensory neuron function in DM associated with abnormal dynamics of nuclear bodies such as Cajal bodies and nuclear speckles in which mRNA transcription and post-transcriptional processing occur. Manipulating noncoding RNAs such as microRNA and long-noncoding RNA (specifically MALAT1) that regulate gene expression through post-transcriptional modification are interesting avenues to consider in supporting neurons during DM. Finally, we present therapeutic possibilities around the use of a novel DNA/RNA heteroduplex oligonucleotide that provides more efficient gene knockdown in DRG than the single-stranded antisense oligonucleotide.
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Affiliation(s)
- Akiko Miyashita
- Department of Neurology, Neurological Science, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
| | - Masaki Kobayashi
- Department of Neurology, Neurological Science, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
- Department of Neurology, Nissan Tamagawa Hospital, Tokyo 158-0095, Japan
| | - Takanori Yokota
- Department of Neurology, Neurological Science, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
| | - Douglas W. Zochodne
- Division of Neurology and Department of Medicine, Faculty of Medicine and Dentistry, The Neuroscience and Mental Health Institute and The Alberta Diabetes Institute, University of Alberta, Edmonton, AB T6G 2G3, Canada
- Correspondence: ; Tel.: +1-780-248-1928; Fax: +1-780-248-1807
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Metabolomic Analysis of Serum and Tear Samples from Patients with Obesity and Type 2 Diabetes Mellitus. Int J Mol Sci 2022; 23:ijms23094534. [PMID: 35562924 PMCID: PMC9105607 DOI: 10.3390/ijms23094534] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 04/13/2022] [Accepted: 04/14/2022] [Indexed: 12/14/2022] Open
Abstract
Metabolomics strategies are widely used to examine obesity and type 2 diabetes (T2D). Patients with obesity (n = 31) or T2D (n = 26) and sex- and age-matched controls (n = 28) were recruited, and serum and tear samples were collected. The concentration of 23 amino acids and 10 biogenic amines in serum and tear samples was analyzed. Statistical analysis and Pearson correlation analysis along with network analysis were carried out. Compared to controls, changes in the level of 6 analytes in the obese group and of 10 analytes in the T2D group were statistically significant. For obesity, the energy generation, while for T2D, the involvement of NO synthesis and its relation to insulin signaling and inflammation, were characteristic. We found that BCAA and glutamine metabolism, urea cycle, and beta-oxidation make up crucial parts of the metabolic changes in T2D. According to our data, the retromer-mediated retrograde transport, the ethanolamine metabolism, and, consequently, the endocannabinoid signaling and phospholipid metabolism were characteristic of both conditions and can be relevant pathways to understanding and treating insulin resistance. By providing potential therapeutic targets and new starting points for mechanistic studies, our results emphasize the importance of complex data analysis procedures to better understand the pathomechanism of obesity and diabetes.
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Hagen KM, Ousman SS. Aging and the immune response in diabetic peripheral neuropathy. J Neuroimmunol 2021; 355:577574. [PMID: 33894676 DOI: 10.1016/j.jneuroim.2021.577574] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 04/09/2021] [Accepted: 04/10/2021] [Indexed: 12/27/2022]
Abstract
A large proportion of older individuals with diabetes go on to develop diabetic peripheral neuropathy (DPN). DPN is associated with an increase in inflammatory cells within the peripheral nerve, activation of nuclear factor kappa-light-chain-enhancer of activated B cells and receptors for advanced glycation end products/advanced glycation end products pathways, aberrant cytokine expression, oxidative stress, ischemia, as well as pro-inflammatory changes in the bone marrow; all processes that may be exacerbated with age. We review the immunological features of DPN and discuss whether age-related changes in relevant immunological areas may contribute to age being a risk factor for DPN.
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Affiliation(s)
- Kathleen M Hagen
- Department of Neuroscience, Hotchkiss Brain Institute, University of Calgary, Calgary, AB T2N 4N1, Canada
| | - Shalina S Ousman
- Departments of Clinical Neurosciences and Cell Biology and Anatomy, Hotchkiss Brain Institute, University of Calgary, Calgary, AB T2N 4N1, Canada.
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Abstract
Neuropathy is a common complication of long-term diabetes that impairs quality of life by producing pain, sensory loss and limb amputation. The presence of neuropathy in both insulin-deficient (type 1) and insulin resistant (type 2) diabetes along with the slowing of progression of neuropathy by improved glycemic control in type 1 diabetes has caused the majority of preclinical and clinical investigations to focus on hyperglycemia as the initiating pathogenic lesion. Studies in animal models of diabetes have identified multiple plausible mechanisms of glucotoxicity to the nervous system including post-translational modification of proteins by glucose and increased glucose metabolism by aldose reductase, glycolysis and other catabolic pathways. However, it is becoming increasingly apparent that factors not necessarily downstream of hyperglycemia can also contribute to the incidence, progression and severity of neuropathy and neuropathic pain. For example, peripheral nerve contains insulin receptors that transduce the neurotrophic and neurosupportive properties of insulin, independent of systemic glucose regulation, while the detection of neuropathy and neuropathic pain in patients with metabolic syndrome and failure of improved glycemic control to protect against neuropathy in cohorts of type 2 diabetic patients has placed a focus on the pathogenic role of dyslipidemia. This review provides an overview of current understanding of potential initiating lesions for diabetic neuropathy and the multiple downstream mechanisms identified in cell and animal models of diabetes that may contribute to the pathogenesis of diabetic neuropathy and neuropathic pain.
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Elhessy HM, Eltahry H, Erfan OS, Mahdi MR, Hazem NM, El-Shahat MA. Evaluation of the modulation of nitric oxide synthase expression in the cerebellum of diabetic albino rats and the possible protective effect of ferulic acid. Acta Histochem 2020; 122:151633. [PMID: 33045658 DOI: 10.1016/j.acthis.2020.151633] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 09/21/2020] [Accepted: 09/22/2020] [Indexed: 01/29/2023]
Abstract
INTRODUCTION Diabetes mellitus is a multisystem disease. Oxidative stress and nitric oxide isoforms are involved in diabetic pathogenesis. Ferulic acid is a natural substance that is distributed broadly in plants with strong potent properties. THE AIM OF THE RESEARCH This research was designed to study the possible protective role of ferulic acid on oxidative stress and different Nitric oxide synthase isoforms (NOS) in the cerebellum of streptozotocin-induced diabetic rats. MATERIALS AND METHODS Twenty-four albino male rats were randomly divided into equal four groups: control group, group 2 received ferulic acid orally (10 mg/kg), group 3 diabetic group, group 4 diabetic rats received ferulic acid. After 8 weeks, the left cerebellar hemisphere was taken for tissue homogenate for oxidative markers and real-time PCR for NOS isoforms. Paraffin sections of the right cerebellar hemisphere were stained with cresyl violet, Luxol fast blue and immnunohistochemically stained for neuronal NOS, inducible NOS and endothelial NOS. RESULTS Degenerative changes were seen in the cerebella of the diabetic rats with significant elevation of Malondialdehyde, Nitric Oxide, and decrease of Superoxide dismutase levels. nNOS expression decreased and iNOS expression increased significantly. The ferulic acid-treated group showed a reduction of the degenerative changes in the cerebellum with significant improvement in oxidative stress marker, an increase of nNOS expression, and a decrease of iNOS expression. CONCLUSIONS Ferulic acid improves cerebellar functional and histopathological changes induced by diabetes which can be attributed mainly to its anti-oxidative effect and its ability to modulate NOS isoforms.
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Ni CM, Ling BY, Xu X, Sun HP, Jin H, Zhang YQ, Cao H, Xu L. CX3CR1 contributes to streptozotocin-induced mechanical allodynia in the mouse spinal cord. J Zhejiang Univ Sci B 2020; 21:166-171. [PMID: 32115913 DOI: 10.1631/jzus.b1900439] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Patients with diabetic peripheral neuropathy experience debilitating pain that significantly affects their quality of life (Abbott et al., 2011), by causing sleeping disorders, anxiety, and depression (Dermanovic Dobrota et al., 2014). The primary clinical manifestation of painful diabetic neuropathy (PDN) is mechanical hypersensitivity, also known as mechanical allodynia (MA) (Callaghan et al., 2012). MA's underlying mechanism remains poorly understood, and so far, based on symptomatic treatment, it has no effective therapy (Moore et al., 2014).
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Affiliation(s)
- Cheng-Ming Ni
- Department of Endocrinology, the Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
| | - Bing-Yu Ling
- Department of Emergency, Northern Jiangsu People's Hospital, Yangzhou University, Yangzhou 225001, China
| | - Xiang Xu
- Department of Endocrinology, the Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
| | - He-Ping Sun
- Department of Endocrinology, the Affiliated Kunshan First People's Hospital of Jiangsu University, Kunshan 215300, China
| | - Hui Jin
- Department of Endocrinology, the Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
| | - Yu-Qiu Zhang
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and Collaborative Innovation Center for Brain Science, Fudan University, Shanghai 200032, China
| | - Hong Cao
- Department of Translational Neuroscience, Jing'an District Centre Hospital of Shanghai, Institutes of Brain Science, State Key Laboratory of Medical Neurobiology and Collaborative Innovation Center for Brain Science, Fudan University, Shanghai 200032, China
| | - Lan Xu
- Department of Endocrinology, the Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi 214023, China
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Rajchgot T, Thomas SC, Wang JC, Ahmadi M, Balood M, Crosson T, Dias JP, Couture R, Claing A, Talbot S. Neurons and Microglia; A Sickly-Sweet Duo in Diabetic Pain Neuropathy. Front Neurosci 2019; 13:25. [PMID: 30766472 PMCID: PMC6365454 DOI: 10.3389/fnins.2019.00025] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Accepted: 01/11/2019] [Indexed: 12/11/2022] Open
Abstract
Diabetes is a common condition characterized by persistent hyperglycemia. High blood sugar primarily affects cells that have a limited capacity to regulate their glucose intake. These cells include capillary endothelial cells in the retina, mesangial cells in the renal glomerulus, Schwann cells, and neurons of the peripheral and central nervous systems. As a result, hyperglycemia leads to largely intractable complications such as retinopathy, nephropathy, hypertension, and neuropathy. Diabetic pain neuropathy is a complex and multifactorial disease that has been associated with poor glycemic control, longer diabetes duration, hypertension, advanced age, smoking status, hypoinsulinemia, and dyslipidemia. While many of the driving factors involved in diabetic pain are still being investigated, they can be broadly classified as either neuron -intrinsic or -extrinsic. In neurons, hyperglycemia impairs the polyol pathway, leading to an overproduction of reactive oxygen species and reactive nitrogen species, an enhanced formation of advanced glycation end products, and a disruption in Na+/K+ ATPase pump function. In terms of the extrinsic pathway, hyperglycemia leads to the generation of both overactive microglia and microangiopathy. The former incites a feed-forward inflammatory loop that hypersensitizes nociceptor neurons, as observed at the onset of diabetic pain neuropathy. The latter reduces neurons' access to oxygen, glucose and nutrients, prompting reductions in nociceptor terminal expression and losses in sensation, as observed in the later stages of diabetic pain neuropathy. Overall, microglia can be seen as potent and long-lasting amplifiers of nociceptor neuron activity, and may therefore constitute a potential therapeutic target in the treatment of diabetic pain neuropathy.
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Affiliation(s)
- Trevor Rajchgot
- Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
| | - Sini Christine Thomas
- Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
| | - Jo-Chiao Wang
- Graduate Institute of Microbiology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Maryam Ahmadi
- Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
| | - Mohammad Balood
- Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
| | - Théo Crosson
- Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
| | - Jenny Pena Dias
- Johns Hopkins University School of Medicine, Division of Endocrinology, Diabetes and Metabolism, Baltimore, MD, United States
| | - Réjean Couture
- Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
| | - Audrey Claing
- Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
| | - Sébastien Talbot
- Département de Pharmacologie et Physiologie, Faculté de Médecine, Université de Montréal, Montréal, QC, Canada
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Liu Q, Gao Z, Zhu X, Wu Z, Li D, He H, Huang F, Fan W. Changes in nitric oxide synthase isoforms in the trigeminal ganglion of rat following chronic tooth pulp inflammation. Neurosci Lett 2016; 633:240-245. [PMID: 27687716 DOI: 10.1016/j.neulet.2016.09.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 09/23/2016] [Accepted: 09/24/2016] [Indexed: 11/24/2022]
Abstract
Nitric oxide (NO) possibly plays an important role in the events resulting in hyperalgesia. NO synthase (NOS) is a key enzyme in the production of NO. Changes in NOS expression in primary sensory neurons may be involved in the persistent sensory abnormalities that can be induced by inflammation. To assess the possible roles of NOS in trigeminal sensory system, we studied changes in the expression of NOS isoforms in the trigeminal ganglion (TG) following chronic inflammation after pulp exposure (PX) in rats. The neurons innervating injured tooth in the TG were labeled by fluoro-gold (FG). Immunohistochemical staining was used to reveal the presence of NOS. The results showed that within the FG-labeled population, neuron counts revealed a significant increase in the proportion of NOS neurons following PX, in which the frequency of iNOS and nNOS-positive neurons started to increase at 3 and 7day, respectively, and peaked at 28day. There was no eNOS expression observed in the control group and PX-treated groups. The results demonstrate that PX-induced chronic pulpal inflammation results in significant increase of nNOS and iNOS in the TG. It suggests that nNOS and iNOS could be involved in mediation of peripheral processing of nociceptive information following chronic tooth pulp inflammation.
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Affiliation(s)
- Qin Liu
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China; Department of Pediatric Dentistry, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Zhixiong Gao
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China; Department of Pediatric Dentistry, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Xiao Zhu
- Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Dongguan Scientific Research Center, Guangdong Medical University, Dongguan, China
| | - Zhi Wu
- Department of Anesthesiology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Dongpei Li
- Department of Neuroscience and Regenerative Medicine, Georgia Regents University, Augusta, GA 30912, USA
| | - Hongwen He
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - Fang Huang
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China; Department of Pediatric Dentistry, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.
| | - Wenguo Fan
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China; Department of Anesthesiology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China.
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Abstract
Diabetic polyneuropathy (DPN) is a common but intractable degenerative disorder of peripheral neurons. DPN first results in retraction and loss of sensory terminals in target organs such as the skin, whereas the perikarya (cell bodies) of neurons are relatively preserved. This is important because it implies that regrowth of distal terminals, rather than neuron replacement or rescue, may be useful clinically. Although a number of neuronal molecular abnormalities have been examined in experimental DPN, several are prominent: loss of structural proteins, neuropeptides, and neurotrophic receptors; upregulation of "stress" and "repair" proteins; elevated nitric oxide synthesis; increased AGE-RAGE signaling, NF-κB and PKC; altered neuron survival pathways; changes of pain-related ion channel investment. There is also a role for abnormalities of direct signaling of neurons by insulin, an important trophic factor for neurons that express its receptors. While evidence implicating each of these pathways has emerged, how they link together and result in neuronal degeneration remains unclear. However, several offer interesting new avenues for more definitive therapy of this condition.
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Affiliation(s)
- Douglas W Zochodne
- Division of Neurology, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.
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Castany S, Carcolé M, Leánez S, Pol O. The role of carbon monoxide on the anti-nociceptive effects and expression of cannabinoid 2 receptors during painful diabetic neuropathy in mice. Psychopharmacology (Berl) 2016; 233:2209-2219. [PMID: 27020787 DOI: 10.1007/s00213-016-4271-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 03/08/2016] [Indexed: 12/12/2022]
Abstract
RATIONALE The activation of cannabinoid 2 receptors (CB2R) attenuates chronic pain, but the role played by carbon monoxide synthesized by the inducible heme oxygenase 1 (HO-1) on the anti-nociceptive effects produced by a selective CB2R agonist, JWH-015, during painful diabetic neuropathy remains unknown. OBJECTIVES AND METHODS In streptozotocin (STZ)-induced diabetic mice, the anti-allodynic and anti-hyperalgesic effects of the subcutaneous administration of JWH-015 alone or combined with the intraperitoneal administration of a carbon monoxide-releasing molecule (tricarbonyldichlororuthenium(II) dimer (CORM-2)) or an HO-1 inducer compound (cobalt protoporphyrin IX (CoPP)) at 10 mg/kg were evaluated. Reversion of JWH-015 anti-nociceptive effects by the administration of an HO-1 inhibitor (tin protoporphyrin IX (SnPP)) and a CB2R antagonist (AM630) was also evaluated. Furthermore, the protein levels of HO-1, neuronal nitric oxide synthase (NOS1), and CB2R in diabetic mice treated with CORM-2 and CoPP alone or combined with JWH-015 were also assessed. RESULTS The administration of JWH-015 dose dependently inhibited hypersensitivity induced by diabetes. The effects of JWH-015 were enhanced by their coadministration with CORM-2 or CoPP and reversed by SnPP or AM630. The increased protein levels of HO-1 induced by CORM-2 and CoPP treatments were further enhanced in JWH-015-treated mice. All treatments similarly enhanced the peripheral expression of CB2R and avoided the spinal cord over-expression of NOS1 induced by diabetes. CONCLUSIONS The activation of HO-1 enhanced the anti-nociceptive effects of JWH-015 in diabetic mice, suggesting that coadministration of JWH-015 with CORM-2 or CoPP might be an interesting approach for the treatment of painful diabetic neuropathy in mice.
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Affiliation(s)
- Sílvia Castany
- Grup de Neurofarmacologia Molecular, Institut d'Investigació Biomèdica Sant Pau and Institut de Neurociències. Facultat de Medicina, Edifici M2-115, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Mireia Carcolé
- Grup de Neurofarmacologia Molecular, Institut d'Investigació Biomèdica Sant Pau and Institut de Neurociències. Facultat de Medicina, Edifici M2-115, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Sergi Leánez
- Grup de Neurofarmacologia Molecular, Institut d'Investigació Biomèdica Sant Pau and Institut de Neurociències. Facultat de Medicina, Edifici M2-115, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Olga Pol
- Grup de Neurofarmacologia Molecular, Institut d'Investigació Biomèdica Sant Pau and Institut de Neurociències. Facultat de Medicina, Edifici M2-115, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
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van den Born JC, Hammes HP, Greffrath W, van Goor H, Hillebrands JL. Gasotransmitters in Vascular Complications of Diabetes. Diabetes 2016; 65:331-45. [PMID: 26798119 DOI: 10.2337/db15-1003] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
In the past decades three gaseous signaling molecules-so-called gasotransmitters-have been identified: nitric oxide (NO), carbon monoxide (CO), and hydrogen sulfide (H2S). These gasotransmitters are endogenously produced by different enzymes in various cell types and play an important role in physiology and disease. Despite their specific functions, all gasotransmitters share the capacity to reduce oxidative stress, induce angiogenesis, and promote vasorelaxation. In patients with diabetes, a lower bioavailability of the different gasotransmitters is observed when compared with healthy individuals. As yet, it is unknown whether this reduction precedes or results from diabetes. The increased risk for vascular disease in patients with diabetes, in combination with the extensive clinical, financial, and societal burden, calls for action to either prevent or improve the treatment of vascular complications. In this Perspective, we present a concise overview of the current data on the bioavailability of gasotransmitters in diabetes and their potential role in the development and progression of diabetes-associated microvascular (retinopathy, neuropathy, and nephropathy) and macrovascular (cerebrovascular, coronary artery, and peripheral arterial diseases) complications. Gasotransmitters appear to have both inhibitory and stimulatory effects in the course of vascular disease development. This Perspective concludes with a discussion on gasotransmitter-based interventions as a therapeutic option.
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Affiliation(s)
- Joost C van den Born
- Department of Pathology and Medical Biology, Division of Pathology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Hans-Peter Hammes
- 5th Medical Department, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Wolfgang Greffrath
- Department of Neurophysiology, Centre for Biomedicine and Medical Technology Mannheim, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - Harry van Goor
- Department of Pathology and Medical Biology, Division of Pathology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Jan-Luuk Hillebrands
- Department of Pathology and Medical Biology, Division of Pathology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
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Zochodne DW. Diabetes and the plasticity of sensory neurons. Neurosci Lett 2015; 596:60-5. [DOI: 10.1016/j.neulet.2014.11.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 11/11/2014] [Accepted: 11/13/2014] [Indexed: 12/13/2022]
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Ramachandran R, Bhatt DK, Ploug KB, Hay-Schmidt A, Jansen-Olesen I, Gupta S, Olesen J. Nitric oxide synthase, calcitonin gene-related peptide and NK-1 receptor mechanisms are involved in GTN-induced neuronal activation. Cephalalgia 2013; 34:136-47. [PMID: 24000375 DOI: 10.1177/0333102413502735] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND AND AIM Infusion of glyceryltrinitrate (GTN), a nitric oxide (NO) donor, in awake, freely moving rats closely mimics a universally accepted human model of migraine and responds to sumatriptan treatment. Here we analyse the effect of nitric oxide synthase (NOS) and calcitonin gene-related peptide (CGRP) systems on the GTN-induced neuronal activation in this model. MATERIALS AND METHODS The femoral vein was catheterised in rats and GTN was infused (4 µg/kg/min, for 20 minutes, intravenously). Immunohistochemistry was performed to analyse Fos, nNOS and CGRP and Western blot for measuring nNOS protein expression. The effect of olcegepant, L-nitro-arginine methyl ester (L-NAME) and neurokinin (NK)-1 receptor antagonist L-733060 were analysed on Fos activation. RESULTS GTN-treated rats showed a significant increase of nNOS and CGRP in dura mater and CGRP in the trigeminal nucleus caudalis (TNC). Upregulation of Fos was observed in TNC four hours after the infusion. This activation was inhibited by pre-treatment with olcegepant. Pre-treatment with L-NAME and L-733060 also significantly inhibited GTN induced Fos expression. CONCLUSION The present study indicates that blockers of CGRP, NOS and NK-1 receptors all inhibit GTN induced Fos activation. These findings also predict that pre-treatment with olcegepant may be a better option than post-treatment to study its inhibitory effect in GTN migraine models.
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Affiliation(s)
- Roshni Ramachandran
- Danish Headache Centre, Department of Neurology, Glostrup Research Institute, Glostrup Hospital, University of Copenhagen, Denmark
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Petho G, Reeh PW. Sensory and signaling mechanisms of bradykinin, eicosanoids, platelet-activating factor, and nitric oxide in peripheral nociceptors. Physiol Rev 2013; 92:1699-775. [PMID: 23073630 DOI: 10.1152/physrev.00048.2010] [Citation(s) in RCA: 191] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Peripheral mediators can contribute to the development and maintenance of inflammatory and neuropathic pain and its concomitants (hyperalgesia and allodynia) via two mechanisms. Activation or excitation by these substances of nociceptive nerve endings or fibers implicates generation of action potentials which then travel to the central nervous system and may induce pain sensation. Sensitization of nociceptors refers to their increased responsiveness to either thermal, mechanical, or chemical stimuli that may be translated to corresponding hyperalgesias. This review aims to give an account of the excitatory and sensitizing actions of inflammatory mediators including bradykinin, prostaglandins, thromboxanes, leukotrienes, platelet-activating factor, and nitric oxide on nociceptive primary afferent neurons. Manifestations, receptor molecules, and intracellular signaling mechanisms of the effects of these mediators are discussed in detail. With regard to signaling, most data reported have been obtained from transfected nonneuronal cells and somata of cultured sensory neurons as these structures are more accessible to direct study of sensory and signal transduction. The peripheral processes of sensory neurons, where painful stimuli actually affect the nociceptors in vivo, show marked differences with respect to biophysics, ultrastructure, and equipment with receptors and ion channels compared with cellular models. Therefore, an effort was made to highlight signaling mechanisms for which supporting data from molecular, cellular, and behavioral models are consistent with findings that reflect properties of peripheral nociceptive nerve endings. Identified molecular elements of these signaling pathways may serve as validated targets for development of novel types of analgesic drugs.
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Affiliation(s)
- Gábor Petho
- Pharmacodynamics Unit, Department of Pharmacology and Pharmacotherapy, Faculty of Medicine, University of Pécs, Pécs, Hungary
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16
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Borsani E, Giovannozzi S, Cocchi MA, Boninsegna R, Rezzani R, Rodella LF. Endothelial nitric oxide synthase in dorsal root ganglia during chronic inflammatory nociception. Cells Tissues Organs 2012; 197:159-68. [PMID: 23095572 DOI: 10.1159/000342518] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2012] [Indexed: 11/19/2022] Open
Abstract
Nitric oxide (NO) is a gaseous molecule implicated both in vascular tone and nociceptive transmission. The capillary blood supply to the dorsal root ganglia (DRG) is unique because it is highly permeable to several low and high molecular-weight compounds. This anatomical situation leads to a potential role of endothelial nitric oxide synthase (eNOS) in inflammatory nociception, which is not well established. Therefore, we examined the role of eNOS in DRG in a murine chronic inflammatory pain model induced by complete Freund's adjuvant using L-N(5)-(1-iminoethyl)ornithine (L-NIO), a potent inhibitor of eNOS activity. Pain state was examined using a behavioral test. The expression of eNOS, platelet endothelial cell adhesion molecule-1 (CD31) and vascular endothelial growth factor (VEGF) was examined by immunofluorescence. In control animals, CD31 was detected in vessels; VEGF was localized both in vessels and neurons while a weak eNOS immunopositivity was detected in both vessels and in neurons. Under inflammatory pain conditions, eNOS, CD31 and VEGF immunopositivity increased. Administration of L-NIO significantly attenuated thermal hyperalgesia by 24 h and decreased eNOS activity and CD31 immunopositivity by 7 days. VEGF was unaffected. Our results show that eNOS plays a nociceptive role in the early phases of inflammation while in the later phases it may be involved in neurotrophic support.
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Affiliation(s)
- Elisa Borsani
- Department of Biomedical Sciences and Biotechnologies, Division of Human Anatomy, University of Brescia, Brescia, Italy
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17
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Emerging role of microglial kinin B1 receptor in diabetic pain neuropathy. Exp Neurol 2012; 234:373-81. [DOI: 10.1016/j.expneurol.2011.11.032] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 11/01/2011] [Accepted: 11/22/2011] [Indexed: 12/28/2022]
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18
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Pande M, Hur J, Hong Y, Backus C, Hayes JM, Oh SS, Kretzler M, Feldman EL. Transcriptional profiling of diabetic neuropathy in the BKS db/db mouse: a model of type 2 diabetes. Diabetes 2011; 60:1981-9. [PMID: 21617178 PMCID: PMC3121428 DOI: 10.2337/db10-1541] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
OBJECTIVE A better understanding of the molecular mechanisms underlying the development and progression of diabetic neuropathy (DN) is essential for the design of mechanism-based therapies. We examined changes in global gene expression to define pathways regulated by diabetes in peripheral nerve. RESEARCH DESIGN AND METHODS Microarray data for 24-week-old BKS db/db and db/+ mouse sciatic nerve were analyzed to define significantly differentially expressed genes (DEGs); DEGs were further analyzed to identify regulated biological processes and pathways. Expression profile clustering was performed to identify coexpressed DEGs. A set of coexpressed lipid metabolism genes was used for promoter sequence analysis. RESULTS Gene expression changes are consistent with structural changes of axonal degeneration. Pathways regulated in the db/db nerve include lipid metabolism, carbohydrate metabolism, energy metabolism, peroxisome proliferator-activated receptor signaling, apoptosis, and axon guidance. Promoter sequences of lipid metabolism-related genes exhibit evidence of coregulation of lipid metabolism and nervous system development genes. CONCLUSIONS Our data support existing hypotheses regarding hyperglycemia-mediated nerve damage in DN. Moreover, our analyses revealed a possible coregulation mechanism connecting hyperlipidemia and axonal degeneration.
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Affiliation(s)
- Manjusha Pande
- Department of Neurology, University of Michigan, Ann Arbor, Michigan
- National Center for Integrative Biomedical Informatics, University of Michigan, Ann Arbor, Michigan
| | - Junguk Hur
- Department of Neurology, University of Michigan, Ann Arbor, Michigan
- Bioinformatics Program, University of Michigan, Ann Arbor, Michigan
| | - Yu Hong
- Department of Neurology, University of Michigan, Ann Arbor, Michigan
| | - Carey Backus
- Department of Neurology, University of Michigan, Ann Arbor, Michigan
| | - John M. Hayes
- Department of Neurology, University of Michigan, Ann Arbor, Michigan
| | - Sang Su Oh
- Department of Neurology, University of Michigan, Ann Arbor, Michigan
| | - Matthias Kretzler
- National Center for Integrative Biomedical Informatics, University of Michigan, Ann Arbor, Michigan
- Bioinformatics Program, University of Michigan, Ann Arbor, Michigan
- Department of Nephrology, University of Michigan, Ann Arbor, Michigan
| | - Eva L. Feldman
- Department of Neurology, University of Michigan, Ann Arbor, Michigan
- National Center for Integrative Biomedical Informatics, University of Michigan, Ann Arbor, Michigan
- Bioinformatics Program, University of Michigan, Ann Arbor, Michigan
- Corresponding author: Eva L. Feldman,
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Bazzaz JT, Amoli MM, Pravica V, Chandrasecaran R, Boulton AJ, Larijani B, Hutchinson IV. eNOS gene polymorphism association with retinopathy in type 1 diabetes. Ophthalmic Genet 2010; 31:103-7. [PMID: 20565248 DOI: 10.3109/13816810.2010.482553] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE Nitric oxide (NO) is a major mediator in vascular biology, regulating blood pressure and regional blood flow. NO and the enzymes required for its production may contribute to the aetiology of vascular pathologies. In diabetes, over-production of NO might play a role in the development of diabetic nephropathy, while reduced NO production may be related to the development of diabetic retinopathy and neuropathy, where VEGF (vascular endothelial growth factor) levels are increased in a counter regulatory manner. Among the three nitric oxide synthase (NOS) enzymes most attention has focussed on endothelial NOS (eNOS) because of its relevance to angiopathies. METHODS In this study the influence of a single nucleotide polymorphism at position -786 in the eNOS gene, where there is a C/T base substitution, on development of type 1 diabetes mellitus (T1DM) and its microvascular complications was studied in 249 British Caucasian type 1 diabetics using a case-control association design. Genotyping was carried out using PCR-RFLP technique. RESULTS There was a significant association between the polymorphism -786*C/T and both T1DM and diabetic retinopathy. The distribution of eNOS gene polymorphism genotype frequencies showed a significant difference observed between diabetic patients and healthy controls [CC+CT vs. TT p = 0.05, OR = 1.5 95%CI(0.9-2.5)]. The genotype frequencies for eNOS gene polymorphism was also significantly different between diabetic retinopaths and healthy controls [CC+CT vs. TT p = 0.0000 OR = 3.4 95%CI(1.9-6.1) No significant differences for eNOS allele and genotype frequencies were found in other groups compared to the controls. CONCLUSION Therefore, eNOS gene variation may be a factor in the genetic propensity to T1DM and diabetic retinopathy that may have a prognostic value or may suggest interventional approaches to regulate eNOS in patients with diabetes.
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Affiliation(s)
- Javad Tavakkoly Bazzaz
- Endocrinology and Metabolism Research Center, Tehran University of Medical Sciences, Tehran, Iran.
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20
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Alves EPB, Alves AMP, Pereira RVF, de Miranda Neto MH, Zanoni JN. Immunohistochemical study of vasoactive intestinal peptide (VIP) enteric neurons in diabetic rats supplemented with L-glutamine. Nutr Neurosci 2010; 13:43-51. [PMID: 20132654 DOI: 10.1179/147683010x12611460763841] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The purpose of this work was to study the area of the varicosities of nerve fibers of myenteric neurons immunoreactive to vasoactive intestinal peptide (VIP-IR) and of the cell bodies of VIP-IR submucosal neurons of the jejunum of diabetic rats supplemented with 2% L-glutamine. Twenty male rats were divided into the following groups: normoglycemic (N), normoglycemic supplemented with L-glutamine (NG), diabetic (D) and diabetic supplemented with L-glutamine (DG). Whole-mounts of the muscle tunica and the submucosal layer were subjected to the immunohistochemical technique for neurotransmitter VIP identification. Morphometric analyses were carried out in 500 VIP-IR cell bodies of submucosal neurons and 2000 VIP-IR varicosities from each group. L-Glutamine supplementation to the normoglycemic animals caused an increase in the areas of the cell bodies (8.49%) and varicosities (21.3%) relative to the controls (P < 0.05). On the other hand, there was a decrease in the areas of the cell bodies (4.55%) and varicosities (28.9%) of group DG compared to those of group D (P < 0.05). It is concluded that L-glutamine supplementation was positive both to normoglycemic and diabetic animals.
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Affiliation(s)
- Eder Paulo Belato Alves
- Department of Morphophysiological Sciences, Laboratory of Enteric Neurons, State University of Maringa, Avenida Colombo, 5790 Bloco H-79, CEP 87020-900 Maringá, PR, Brazil.
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21
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Sildenafil and glyceryl trinitrate reduce tactile allodynia in streptozotocin-injected rats. Eur J Pharmacol 2010; 631:17-23. [DOI: 10.1016/j.ejphar.2010.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Revised: 12/08/2009] [Accepted: 01/06/2010] [Indexed: 11/18/2022]
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22
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Vareniuk I, Pacher P, Pavlov IA, Drel VR, Obrosova IG. Peripheral neuropathy in mice with neuronal nitric oxide synthase gene deficiency. Int J Mol Med 2009; 23:571-80. [PMID: 19360314 DOI: 10.3892/ijmm_00000166] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Evidence for the important role of the potent oxidant peroxynitrite in peripheral diabetic neuropathy and neuropathic pain is emerging. This study evaluated the contribution of neuronal nitric oxide synthase (nNOS) to diabetes-induced nitrosative stress in peripheral nerve and dorsal root ganglia, and peripheral nerve dysfunction and degeneration. Control and nNOS-/- mice were made diabetic with streptozotocin, and maintained for 6 weeks. Peroxynitrite injury was assessed by nitrotyrosine and poly(ADP-ribose) immunoreactivities. Peripheral diabetic neuropathy was evaluated by measurements of sciatic motor and hind-limb digital sensory nerve conduction velocities, thermal algesia, tactile allodynia, and intraepidermal nerve fiber density. Control nNOS-/- mice displayed normal motor nerve conduction velocity and thermal response latency, whereas sensory nerve conduction velocity was slightly lower compared with non-diabetic wild-type mice, and tactile response threshold and intraepidermal nerve fiber density were reduced by 47 and 38%, respectively. Both diabetic wild-type and nNOS-/- mice displayed enhanced nitrosative stress in peripheral nerve. In contrast to diabetic wild-type mice, diabetic nNOS-/- mice had near normal nitrotyrosine and poly(ADP-ribose) immunofluorescence in dorsal root ganglia. Both diabetic wild-type and nNOS-/- mice developed motor and sensory nerve conduction velocity deficits and thermal hypoalgesia although nNOS gene deficiency slightly reduced severity of the three disorders. Tactile response thresholds were similarly decreased in control and diabetic nNOS-/- mice compared with non-diabetic wild-type mice. Intraepidermal nerve fiber density was lower by 27% in diabetic nNOS-/- mice compared with the corresponding non-diabetic group, and by 20% in diabetic nNOS-/- mice compared with diabetic wild-type mice. In conclusion, nNOS is required for maintaining the normal peripheral nerve function and small sensory nerve fibre innervation. nNOS gene deficiency does not protect from development of nerve conduction deficit, sensory neuropathy and intraepidermal nerve fiber loss.
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Affiliation(s)
- Igor Vareniuk
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, LA 70808, USA
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23
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Fan W, Huang F, Li C, Qu H, Gao Z, Leng S, Li D, He H. Involvement of NOS/NO in the development of chronic dental inflammatory pain in rats. ACTA ACUST UNITED AC 2008; 59:324-32. [PMID: 19013482 DOI: 10.1016/j.brainresrev.2008.10.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2008] [Revised: 10/09/2008] [Accepted: 10/11/2008] [Indexed: 12/29/2022]
Abstract
Nitric oxide (NO) is believed to be an important messenger molecule in nociceptive transmission. To assess the possible roles of NO in trigeminal sensory system, we examined the distribution and density of histochemical staining for nicotinamide adenine dinucleotide phosphate diaphorase (NADPH-d), a marker for nitric oxide synthase (NOS), and immunohistochemical staining for c-Fos, a neuronal activity marker, in the trigeminal ganglion (TG) and trigeminal nucleus caudalis (Vc) following pulp exposure (PX) injured rats. The neurons innervating injured tooth in TG were labeled by the retrograde transport of fluoro-gold (FG). Teeth were processed for H&E staining. We found that NADPH-d activity increased significantly in the TG and Vc following PX pretreatment (7-28 days, especially in 21-28 days). Such changes were closely corresponding to the pattern of c-Fos detected by immunocytochemistry. The results demonstrate that PX-induced chronic pulpal inflammation results in significant alterations in the TG cells and in the Vc, and such changes may underlie the observed NADPH-d activity. It suggests that NOS/NO may play an active role in both peripheral and central processing of nociceptive information following chronic tooth inflammation.
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Affiliation(s)
- Wenguo Fan
- Department of Oral Anatomy and Physiology, Guanghua School of Stomatology, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou, 510080, China
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24
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Vareniuk I, Pavlov IA, Obrosova IG. Inducible nitric oxide synthase gene deficiency counteracts multiple manifestations of peripheral neuropathy in a streptozotocin-induced mouse model of diabetes. Diabetologia 2008; 51:2126-33. [PMID: 18802679 PMCID: PMC3044437 DOI: 10.1007/s00125-008-1136-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Accepted: 07/22/2008] [Indexed: 10/21/2022]
Abstract
AIMS/HYPOTHESIS Evidence for the importance of peroxynitrite, a product of superoxide anion radical reaction with nitric oxide, in peripheral diabetic neuropathy is emerging. The role of specific nitric oxide synthase isoforms in diabetes-associated nitrosative stress and nerve fibre dysfunction and degeneration remains unknown. This study evaluated the contribution of inducible nitric oxide synthase (iNOS) to peroxynitrite injury to peripheral nerve and dorsal root ganglia and development of peripheral diabetic neuropathy. METHODS Control mice and mice with iNos (also known as Nos2) gene deficiency (iNos ( -/- )) were made diabetic with streptozotocin, and maintained for 6 weeks. Peroxynitrite injury was assessed by nitrotyrosine and poly(ADP-ribose) accumulation (immunohistochemistry). Thermal algesia was evaluated by paw withdrawal, tail-flick and hot plate tests, mechanical algesia by the Randall-Selitto test, and tactile allodynia by a von Frey filament test. RESULTS Diabetic wild-type mice displayed peroxynitrite injury in peripheral nerve and dorsal root ganglion neurons. They also developed motor and sensory nerve conduction velocity deficits, thermal and mechanical hypoalgesia, tactile allodynia and approximately 36% loss of intraepidermal nerve fibres. Diabetic iNos ( -/- ) mice did not display nitrotyrosine and poly(ADP-ribose) accumulation in peripheral nerve, but were not protected from nitrosative stress in dorsal root ganglia. Despite this latter circumstance, diabetic iNos ( -/- ) mice preserved normal nerve conduction velocities. Small-fibre sensory neuropathy was also less severe in diabetic iNos ( -/- ) than in wild-type mice. CONCLUSIONS/INTERPRETATION iNOS plays a key role in peroxynitrite injury to peripheral nerve, and functional and structural changes of diabetic neuropathy. Nitrosative stress in axons and Schwann cells, rather than dorsal root ganglion neurons, underlies peripheral nerve dysfunction and degeneration.
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Affiliation(s)
- I Vareniuk
- Pennington Biomedical Research Center, Louisiana State University System, LA 70808, USA
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25
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Zochodne DW. Diabetes mellitus and the peripheral nervous system: manifestations and mechanisms. Muscle Nerve 2007; 36:144-66. [PMID: 17469109 DOI: 10.1002/mus.20785] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Diabetes targets the peripheral nervous system with several different patterns of damage and several mechanisms of disease. Diabetic polyneuropathy (DPN) is a common disorder involving a large proportion of diabetic patients, yet its pathophysiology is controversial. Mechanisms considered have included polyol flux, microangiopathy, oxidative stress, abnormal signaling from advanced glycation endproducts and growth factor deficiency. Although some clinical trials have demonstrated modest benefits in disease stabilization or pain therapy in DPN, robust therapy capable of reversing the disease is unavailable. In this review, general aspects of DPN and other diabetic neuropathies are examined, including a summary of recent therapeutic trials. A particular emphasis is placed on the evidence that the neurobiology of DPN reflects a unique yet common and disabling neurodegenerative disorder.
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Affiliation(s)
- Douglas W Zochodne
- Department of Clinical Neurosciences, Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta T2N 4N1, Canada.
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Ruscheweyh R, Goralczyk A, Wunderbaldinger G, Schober A, Sandkühler J. Possible sources and sites of action of the nitric oxide involved in synaptic plasticity at spinal lamina I projection neurons. Neuroscience 2006; 141:977-988. [PMID: 16725273 DOI: 10.1016/j.neuroscience.2006.04.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2006] [Revised: 04/03/2006] [Accepted: 04/04/2006] [Indexed: 10/24/2022]
Abstract
The synaptic long-term potentiation between primary afferent C-fibers and spinal lamina I projection neurons is a cellular model for hyperalgesia [Ikeda H, Heinke B, Ruscheweyh R, Sandkühler J (2003) Synaptic plasticity in spinal lamina I projection neurons that mediate hyperalgesia. Science 299:1237-1240]. In lamina I neurons with a projection to the periaqueductal gray, this long-term potentiation is dependent on nitric oxide. In the present study, we used immunohistochemistry to detect possible sources and sites of action of the nitric oxide necessary for the long-term potentiation at lamina I spino-periaqueductal gray neurons in rats. None of the three isoforms of the nitric oxide synthase was expressed in a significant number of lamina I spino-periaqueductal gray neurons or primary afferent C-fibers (as evaluated by staining of their cell bodies in the dorsal root ganglia). However, endothelial and inducible nitric oxide synthase were found throughout the spinal cord vasculature and neuronal nitric oxide synthase was present in a number of neurons in laminae II and III. The nitric oxide target soluble guanylyl cyclase was detected in most lamina I spino-periaqueductal gray neurons and in approximately 12% of the dorsal root ganglion neurons, all of them nociceptive as evaluated by coexpression of substance P. Synthesis of cyclic 3',5'-guanosine monophosphate upon stimulation by a nitric oxide donor confirmed the presence of active guanylyl cyclase in at least a portion of the spino-periaqueductal gray neuronal cell bodies. We therefore propose that nitric oxide generated in neighboring neurons or blood vessels acts on the spino-periaqueductal gray neuron and/or the primary afferent C-fiber to enable long-term potentiation. Lamina I spino-parabrachial neurons were stained for comparison and yielded similar results.
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Affiliation(s)
- R Ruscheweyh
- Department of Neurophysiology, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, A-1090 Vienna, Austria
| | - A Goralczyk
- Department of Neurophysiology, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, A-1090 Vienna, Austria; Neuroanatomy and Interdisciplinary Center for Neurosciences, University of Heidelberg, Im Neuenheimer Feld 307, D-69120 Heidelberg, Germany
| | - G Wunderbaldinger
- Department of Neurophysiology, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, A-1090 Vienna, Austria
| | - A Schober
- Neuroanatomy and Interdisciplinary Center for Neurosciences, University of Heidelberg, Im Neuenheimer Feld 307, D-69120 Heidelberg, Germany
| | - J Sandkühler
- Department of Neurophysiology, Center for Brain Research, Medical University of Vienna, Spitalgasse 4, A-1090 Vienna, Austria.
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Zhong Z, Davidescu A, Ehrén I, Ekberg K, Jörnvall H, Wahren J, Chibalin AV. C-peptide stimulates ERK1/2 and JNK MAP kinases via activation of protein kinase C in human renal tubular cells. Diabetologia 2005; 48:187-97. [PMID: 15624099 DOI: 10.1007/s00125-004-1602-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2004] [Accepted: 08/13/2004] [Indexed: 12/11/2022]
Abstract
AIMS/HYPOTHESIS Accumulating evidence indicates that replacement of C-peptide in type 1 diabetes ameliorates nerve and kidney dysfunction, but the molecular mechanisms involved are incompletely understood. C-peptide shows specific binding to a G-protein-coupled membrane binding site, resulting in Ca(2+) influx, activation of mitogen-activated protein kinase signalling pathways, and stimulation of Na(+), K(+)-ATPase and endothelial nitric oxide synthase. This study examines the intracellular signalling pathways activated by C-peptide in human renal tubular cells. METHODS Human renal tubular cells were cultured from the outer cortex of renal tissue obtained from patients undergoing elective nephrectomy. Extracellular-signal-regulated kinase 1/2 (ERK1/2), c-Jun N-terminal kinase (JNK) and Akt/protein kinase B (PKB) activation was determined using phospho-specific antibodies. Protein kinase C (PKC) and RhoA activation was determined by measuring their translocation to the cell membrane fraction using isoform-specific antibodies. RESULTS Human C-peptide increases phosphorylation of ERK1/2 and Akt/PKB in a concentration- and time-dependent manner in renal tubular cells. The C-terminal pentapeptide of C-peptide is equipotent with the full-length C-peptide, whereas scrambled C-peptide has no effect. C-peptide stimulation also results in phosphorylation of JNK, but not of p38 mitogen-activated protein kinase. MEK1/2 inhibitor PD98059 blocks the C-peptide effect on ERK1/2 phosphorylation. C-peptide causes specific translocation of PKC isoforms delta and epsilon to the membrane fraction in tubular cells. All stimulatory effects of C-peptide were abolished by pertussis toxin. The isoform-specific PKC-delta inhibitor rottlerin and the broad-spectrum PKC inhibitor GF109203X both abolish the C-peptide effect on ERK1/2 phosphorylation. C-peptide stimulation also causes translocation of the small GTPase RhoA from the cytosol to the cell membrane. Inhibition of phospholipase C abolished the stimulatory effect of C-peptide on phosphorylation of ERK1/2, JNK and PKC-delta. CONCLUSIONS/INTERPRETATION C-peptide signal transduction in human renal tubular cells involves the activation of phospholipase C and PKC-delta and PKC-epsilon, as well as RhoA, followed by phosphorylation of ERK1/2 and JNK, and a parallel activation of Akt.
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Affiliation(s)
- Z Zhong
- Section of Clinical Physiology, Department of Surgical Sciences, Karolinska Institute, Stockholm, Sweden
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28
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Toth C, Brussee V, Cheng C, Zochodne DW. Diabetes Mellitus and the Sensory Neuron. J Neuropathol Exp Neurol 2004; 63:561-73. [PMID: 15217085 DOI: 10.1093/jnen/63.6.561] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Sensory neurons in diabetes may be primarily targeted by diabetes and their involvement may account for prominent sensory loss and pain in diabetic patients. Previous studies demonstrating evidence of excessive polyol flux, microangiopathy, and oxidative stress involving sensory axons and ganglia have been joined by more recent work demonstrating altered neuron phenotype, mitochondrial dysfunction, ion channel alterations, and abnormal growth factor signaling. As such, an interesting and unique panoply of molecular changes in primary sensory neurons has been identified in diabetic models. Insulin deficiency and subsequent changes in second messenger signaling may also play an important role in how sensory neurons respond to diabetes. Applying approaches to support sensory neurons in diabetes may be an important therapeutic direction in diabetic patients.
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Affiliation(s)
- C Toth
- Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
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29
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Papadopolou S, Hartmann P, Lips KS, Kummer W, Haberberger RV. Nicotinic receptor mediated stimulation of NO-generation in neurons of rat thoracic dorsal root ganglia. Neurosci Lett 2004; 361:32-5. [PMID: 15135886 DOI: 10.1016/j.neulet.2003.08.064] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2003] [Revised: 08/27/2003] [Accepted: 08/28/2003] [Indexed: 10/26/2022]
Abstract
The contribution of nicotinic acetylcholine receptors (nAChRs) to stimulation of NO-production was investigated in isolated rat dorsal root ganglion (DRG) neurons utilizing an NO-sensitive fluorescent indicator 4,5-diaminofluorescein-diacetate (DAF-2DA) and appropriate channel blockers. RT-PCR and immunohistochemical analysis of NOS isoforms in cultured neurons revealed the expression of eNOS in the vast majority of neurons, nNOS in about 5-10%, and iNOS only exceptionally. Application of nicotine resulted in an abrupt increase in DAF-2T fluorescence in 65% of neuronal cell bodies that was fully sensitive to the general nAChR antagonist mecamylamine. Methyllycaconitine reduced the number of nicotine-sensitive neurons and the extent of NO-generation. Thus, alpha7- and/or alpha9/10-nAChRs are required for nicotine-induced NO-production in a subpopulation of DRG neurons, and appear to be partially involved in the remaining, larger subpopulation.
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MESH Headings
- Animals
- Cells, Cultured
- Female
- Fluorescein
- Ganglia, Spinal/cytology
- Ganglia, Spinal/drug effects
- Ganglia, Spinal/enzymology
- Neurons, Afferent/drug effects
- Neurons, Afferent/enzymology
- Nicotine/pharmacology
- Nicotinic Antagonists/pharmacology
- Nitric Oxide/biosynthesis
- Nitric Oxide Synthase/drug effects
- Nitric Oxide Synthase/genetics
- Nitric Oxide Synthase/metabolism
- Nitric Oxide Synthase Type I
- Nitric Oxide Synthase Type II
- Nitric Oxide Synthase Type III
- RNA, Messenger/drug effects
- RNA, Messenger/metabolism
- Rats
- Rats, Wistar
- Receptors, Nicotinic/drug effects
- Receptors, Nicotinic/metabolism
- alpha7 Nicotinic Acetylcholine Receptor
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Affiliation(s)
- S Papadopolou
- Institute for Anatomy and Cell Biology, Justus-Liebig-University Giessen, Aulweg 123, 35385 Giessen, Germany
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30
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Xu QG, Cheng C, Sun H, Thomsen K, Zochodne DW. Local sensory ganglion ischemia induced by endothelin vasoconstriction: vulnerability of diabetic neurons and microvessels. Neuroscience 2004; 122:897-905. [PMID: 14643759 DOI: 10.1016/s0306-4522(03)00520-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In some disorders of the peripheral nervous system, it is relevant to understand how sensory neurons respond to selective ganglion ischemia. Sensory dorsal root ganglia may be susceptible to ischemic damage and irretrievable neuron loss because of their metabolic requirements. In diabetes, heightened sensitivity to ischemia associated with elevated endothelin levels might render ganglia particularly vulnerable. In this work, we created a model of local sensory ganglion ischemia by generating intense local vasoconstriction from applied endothelin-1 (ET). In this model, we compared relative vulnerability of L5 ganglia microvessels and neurons to ET in streptozotocin-induced diabetic rats and nondiabetic controls. Diabetic ganglia had reductions in baseline core ganglion blood flow (GBF) measured using microelectrode hydrogen clearance polarography and ET induced particularly profound declines. Serial GBF measurements made using a laser Doppler flowmetry probe also indicated that diabetic ganglia exposed to ET had a marked prolongation in its action. Neuron perikarya and proximal axon segments were more vulnerable in diabetes. Neurons exhibited loss of neurofilament labeling, dissolution of the neurons, replacement of neurons with "nests of Nageotte," displacement of nuclei to the periphery of perikarya, and nuclear labeling with TUNEL. Both intraganglionic axons and downstream sural sensory axons developed evidence of axonal degeneration. Local endothelin-induced vasoconstriction of microvessels supplying dorsal root ganglia provides a selective model of ischemia. Diabetic vessels and neurons, exposed to a greater depth and duration of ischemia from endothelin, are especially vulnerable.
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Affiliation(s)
- Q-G Xu
- Department of Clinical Neurosciences and the Neuroscience Research Group, University of Calgary, Room 182A, 3330 Hospital Drive, NW, Calgary, AB, Canada T2N 4N1
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31
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Cowell RM, Russell JW. Nitrosative Injury and Antioxidant Therapy in the Management of Diabetic Neuropathy. J Investig Med 2004. [DOI: 10.1177/108155890405200124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Strong evidence implicates oxidative stress as a mediator of diabetes-induced microvascular complications, including distal symmetric polyneuropathy. Dorsal root ganglia neurons are particularly susceptible to glucose-mediated oxidative stress and die by apoptotic mechanisms in animal and cell culture models of diabetes. Key mediators of glucose-induced oxidative injury are superoxide anions and nitric oxide (NO). Superoxides are believed to underlie many of the oxidative changes in hyperglycemic conditions, including increases in aldose reductase and protein kinase C activity. Superoxides can also react with NO, forming peroxynitrite (ONOO-), which rapidly causes protein nitration or nitrosylation, lipid peroxidation, deoxyribonucleic acid (DNA) damage, and cell death. ONOO- formation is dependent on both superoxide and NO concentrations; therefore, cells that constitutively express NO synthase, such as endothelial cells and neurons, may be more vulnerable to ONOO–induced cell death in conditions favoring the production of superoxides. Although NO and ONOO- can cause endothelial and neuronal cell death in vitro, in animal models of diabetes, reductions in endothelial NO production can inhibit vasodilatation and cause nerve ischemia. Therefore, ideal therapeutic approaches should limit the formation of superoxides and ONOO while preventing reductions in vascular NO. Despite strong evidence that oxidative stress is associated with complications of diabetes, including neuropathy, the results of clinical trials of antioxidants have shown some promise but not established therapeutic efficacy. Clinical studies of several antioxidants, including α-lipoic acid, vitamins C and E, aldose reductase inhibitors, and growth factors, in diabetic neuropathy are discussed.
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Affiliation(s)
- Rita M. Cowell
- Department of Neurology, University of Michigan, Ann Arbor, MI
| | - James W. Russell
- Department of Neurology, University of Michigan, Ann Arbor, MI
- Department of Neurology Ann Arbor Veterans Administrative Medical Center, Ann Arbor, MI
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32
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Johansson BL, Wahren J, Pernow J. C-peptide increases forearm blood flow in patients with type 1 diabetes via a nitric oxide-dependent mechanism. Am J Physiol Endocrinol Metab 2003; 285:E864-70. [PMID: 12799312 DOI: 10.1152/ajpendo.00001.2003] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Proinsulin C-peptide has been shown to increase muscle blood flow in type 1 diabetic patients. The underlying mechanism is not fully understood. The aim of this study was to evaluate if the vasodilator effect of C-peptide is mediated by nitric oxide (NO). Eleven type 1 diabetic patients were studied two times and randomized to administration of intravenous and intra-arterial infusion of C-peptide or saline. Forearm blood flow (FBF) was measured by venous occlusion plethysmography during infusion of C-peptide or saline before, during, and after NO synthase (NOS) blockade. Endothelium-dependent and -independent vasodilatation was evaluated by administration of acetylcholine and sodium nitroprusside, respectively. FBF increased by 35% during intravenous C-peptide (P < 0.01) but not during saline infusion (-2%, not significant). NOS blockade resulted in a more pronounced reduction in FBF during intravenous C-peptide than during saline infusion (-41 vs. -26%, P < 0.05). Intra-arterial C-peptide failed to increase FBF during NOS blockade. However, when C-peptide was given after the recovery from NOS blockade, FBF rose by 30% (P < 0.001). The vasodilator effects of acetylcholine and nitroprusside were not influenced by C-peptide. It is concluded that the stimulatory effect of C-peptide on FBF in type 1 diabetic patients is mediated via the NO system and that C-peptide increases basal endothelial NO levels.
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Affiliation(s)
- Bo-Lennart Johansson
- Department of Surgical Sciences, Division of Clinical Physiology N1:05, Karolinska Hospital, SE-171 76 Stockholm, Sweden
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33
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Abstract
Long-term experimental diabetes may best model the prominent and irreversible sensory deficits of chronic human diabetic polyneuropathy. Whereas irretrievable loss of sensory neurons, if present, would be an unfortunate feature of the disease, systematic unbiased counting has indicated that sensory neurons survive long-term experimental diabetes. In this study, we examined whether incipient cell loss from apoptosis in chronic experimental diabetes might nonetheless be in process, or whether neurons somehow adapt to their chronic insults. We examined sensory neurons in L4 and L5 dorsal root ganglia of long-term experimental streptozotocin-induced diabetic rats using transferase-mediated dUTP nick-end labeling (TUNEL), 4',6-diamidino-2-phenylindole (DAPI) staining of nuclear morphology, and electron microscopic appraisal of cell morphology. None provided any evidence for ongoing apoptosis. Despite this confirmation that sensory neurons survive, neurons had elevated expression of activated caspase-3 in unique patterns that included their nuclei, cytoplasm, and proximal axonal segments. Bcl-2 expression, a marker of antiapoptosis signaling, was observed in similar numbers of diabetic and nondiabetic neurons. In contrast, diabetic sensory neurons had elevated expression of the DNA repair enzyme poly(ADP-ribose) polymerase (PARP) in their nuclei, cytoplasm, and proximal axonal segments not overlapping with caspase-3 localization. Diabetic sensory neurons also had an apparent rise in cytoplasmic labeling of nitrotyrosine, a marker of peroxynitrite toxicity reported to activate PARP.
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Affiliation(s)
- Chu Cheng
- University of Calgary, Calgary, Alberta, Canada
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34
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Zochodne DW. Nerve and ganglion blood flow in diabetes: an appraisal. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2003; 50:161-202. [PMID: 12198810 DOI: 10.1016/s0074-7742(02)50077-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Vasa nervorum, the vascular supply to peripheral nerve trunks, and their associated cell bodies in ganglia have unique anatomical and physiological characteristics. Several different experimental approaches toward understanding the changes in vase nervorum following injury and disease have been used. Quantative techniques most widely employed have been microelectrode hydrogen clearance palarography and [14C]iodoantipyrine autoradiographic distribution, whereas estimates of red blood cell flux using a fiber-optic laser Doppler probe offer real time data at different sites along the nerve trunk. There are important caveats about the use of these techniques, their advantages, and their limitations. Reports of nerve blood flow require careful documentation of physiological variables, including mean arterial pressure and nerve temperature during the recordings. Several ischemic models of the peripheral nerve trunk have addressed the ischemic threshold below which axonal degeneration ensues (< 5ml/100 g/min). Following injury, rises in local blood flow reflect acitons of vasoactive peptides, nitric oxide, and the development of angiogenesis. In experimental diabetes, a large number of studies have documented reductions in nerve blood flow and tandem corrections of nerve blood flow and conduction slowing. A significant proportions, however, of the work can be criticized on the basis of methodology and interpretation. Similarly, not all work has confirmed that reductions of nerve blood flow are an invariable feature of experimental or human diabetic polyneuropathy. Therefore, while there is disagreement as to whether early declines in nerve blood flow "account" for diabetic polyneuropathy, there is unquestioned eveidence of early microangiopathy. Abnormalities of vase nervorum and micorvessels supplying ganglia at the very least develop parallel to and together with changes in neurons, Schwann cells, and axons.
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Affiliation(s)
- Douglas W Zochodne
- Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada T2N 4N1
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35
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Calcutt NA. Potential mechanisms of neuropathic pain in diabetes. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2003; 50:205-28. [PMID: 12198811 DOI: 10.1016/s0074-7742(02)50078-7] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Abnormal sensations and pain are features of approximately 10% of all cases of diabvetic neuropathy and can cause marked diminution in the quality of life for these patients. The quality and distribution of pain are variable, although descriptions of burning pain in the hands and feet are commonly reported. Like other neuropathic pain states, painful diabetic neuropathy has an unknown pathogenesis and, in many cases, is not alleviated by nonsteriodal anti-inflammatory drugs or opiates. In the last decase, a number of behavioral and physiologic studies have revealed indices of sensory dysfunction in animal models of diabetes. These include hyperalgesia to mechanical and noxious chemical stimuli and allodynia to light touch. Animal models of painful diabetic neuropathy have been used to investigate the therapeutic potential of a range of experimental agents and also to explore potential etiologic mechanisms. There is relatively little evidence to suggest that the peripheral sensory nerves of diabetic rodents exhibit spontaneous activity or increased responsiveness to peripheral stimuli. Indeed, the weight of eveidence suggests that sensory input to the spinal cord is decreased rather than increased in diabetic rodents. Aberrant spinal or supraspinal modulation of sensory processing may therefore be involved in generating allodynia and hyperalgesia in these models. Studies have supported a role for spinally mediated hyeralgesia in diabetic rats that may reflect either a response to diminished peripheral input or a consequence of hyperglycemia on local or descending modulatory systems. Elucidating the affects of diabetes on spinal sensory processing may assist development of novel therapeutic strategies for preventing and alleviating painful diabetic neuropathy.
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Affiliation(s)
- Nigel A Calcutt
- Department of Pathology, University of California, San Diego, La Jolla, California 92093, USA
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Thomsen K, Rubin I, Lauritzen M. NO- and non-NO-, non-prostanoid-dependent vasodilatation in rat sciatic nerve during maturation and developing experimental diabetic neuropathy. J Physiol 2002; 543:977-93. [PMID: 12231652 PMCID: PMC2290537 DOI: 10.1113/jphysiol.2002.023564] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
This study examined NO- and non-NO-, non-prostanoid-dependent pathways of agonist-induced vasodilatation in streptozotocin (STZ)-induced diabetic rats and their age-matched controls at 1-2, 8-10 and 18-20 weeks after induction of diabetes. Using laser Doppler flowmetry, vasodilatory responses to acetylcholine (ACh; 0.1 mM) and morpholino-sydnonimine (SIN-1) were determined in the presence of Ringer solution, during inhibition of NO synthase (NOS) and cyclo-oxygenase (COX) with N(omega)-nitro-L-arginine (L-NNA; 1 mM) + indomethacin (10(-5) M), and during inhibition of K(+) channels, NOS and COX with tetraethylammonium (TEA; 10 mM) + L-NNA + indomethacin. Basal NOS activity and nerve conduction velocity were also determined. In age-matched controls, SIN-1-induced vasodilatation in the presence of TEA + L-NNA + indomethacin, basal NOS activity and the initial vasodilatory response to ACh during NOS and COX inhibition all decreased with maturation. In STZ-induced diabetics, SIN-1-induced vasodilatation in the presence of TEA + L-NNA + indomethacin was impaired immediately after induction of diabetes, but not at 18-20 weeks. NOS activity in STZ-induced diabetics displayed a transient 2-fold increase at 8-10 weeks, decreasing to age-matched control levels at 18-20 weeks. At 18-20 weeks of STZ-induced diabetes, ACh-induced vasodilatation during NOS and COX inhibition was prolonged due to increased K(+) channel activity and experimental diabetic sensory neuropathy (EDN) had developed. Thus, in sciatic nerve microcirculation of STZ-induced diabetic rats: (1) diabetic impairment of vasodilatation in response to exogenous NO was transient; (2) non-NO-, non-prostanoid-dependent vasodilatation and K(+) channel activity were augmented in STZ-induced diabetes; and (3) alterations in NO bioactivity were not related to the development of EDN.
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Affiliation(s)
- Kirsten Thomsen
- Department of Medical Physiology, University of Copenhagen and Department of Neurophysiology, Glostrup Hospital, Denmark.
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37
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Henrich M, Hoffmann K, König P, Gruss M, Fischbach T, Gödecke A, Hempelmann G, Kummer W. Sensory neurons respond to hypoxia with NO production associated with mitochondria. Mol Cell Neurosci 2002; 20:307-22. [PMID: 12093162 DOI: 10.1006/mcne.2002.1111] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Oxygen is pivotal for mammalian cell function, and recent studies suggest an involvement of NO in cellular adaptation to low oxygen supply. Here, we report that endothelial NO-synthase is ubiquitously expressed in rat and mice sensory neurons, and is targeted to juxtamitochondrial compartments of the ER. There it is activated in response to hypoxia while generation of reactive oxygen species remains unaltered. Developing a technique for ultrastructural localization of an NO-sensitive indicator allowed to identify the inner mitochondrial membrane as the target of NO under hypoxia. The demonstrated hypoxic stimulation of endothelial NOS in sensory neurons shall contribute to resistance against hypoxia, since NO promotes cellular survival by interfering with mitochondrial function.
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Affiliation(s)
- Michael Henrich
- Department of Anaesthesiology and Intensive Care, Justus-Liebig-University, D-35385 Giessen, Germany
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38
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Pieper GM, Siebeneich W, Olds CL, Felix CC, Del Soldato P. Vascular protective actions of a nitric oxide aspirin analog in both in vitro and in vivo models of diabetes mellitus. Free Radic Biol Med 2002; 32:1143-56. [PMID: 12031899 DOI: 10.1016/s0891-5849(02)00832-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND Defective endothelium-dependent relaxation is observed in experimental and human diabetes mellitus. The nature of this defect is not fully understood but may involve decreased nitric oxide (NO) bioactivity due to enhanced production of reactive oxygen species (ROS). In this paper, we examine the benefits and actions of a novel NO-donating, antioxidant called 2-acetoxybenzoic acid 2-(2-nitrooxymethyl) phenyl ester, and denoted as NCX4016, on NO-mediated endothelium-dependent relaxation in normal arteries exposed to acute elevations in glucose or in arteries derived from chronic diabetic animals. MATERIAL AND METHODS Intrinsic free radical scavenging by NO-NSAIDs in solution were evaluated using electron paramagnetic resonance (EPR) spectroscopy and spin trapping with 5,5-dimethyl-1-pyrroline-N-oxide (DMPO). In acute studies, normal rat aortas were exposed in tissue culture for 18 h to 5.5 mM or 40 mM in the presence or absence of NCX4016, a NO-donating NSAID unrelated to aspirin (NCX2216) or aspirin. Vascular reactivity of thoracic aortic rings to endothelium-dependent relaxation to acetylcholine in vitro was determined. For chronic hyperglycemia, diabetes was induced in rats by intravenous injection with streptozotocin. Vascular reactivity of thoracic aortic rings to endothelium-dependent relaxation to acetylcholine in vitro was determined after 8 wks in untreated animals or animals chronically-treated with NCX4016. Antioxidant efficacy in vivo was determined by measurement of plasma isoprostanes and by nuclear binding activity of NF-kappaB in nuclear fractions of aortae. RESULTS Incubation with NCX4016 and NCX2216 produced a concentration-dependent inhibition of DMPO-OH formation indicating scavenging of hydroxyl radicals (HO(*)). In contrast, little efficacy to scavenge superoxide anion radicals was noted. Acute incubation of normal arteries with elevated glucose concentration caused inhibition of normal relaxation to acetylcholine. This impairment was prevented by co-incubation with NCX4106 but not by mannitol, the parent compound (aspirin) or by NCX2216. In addition, chronic treatment with NCX4016 prevented the development of defective endothelium-dependent relaxation to acetylcholine. This protection did not occur as a result to any changes in blood glucose concentration or hemoglobin glycation. Treatment with NCX4016 did decrease the elevation in plasma isoprostanes and normalized the diabetes-induced increase in NF-kappaB binding activity in nuclear fractions derived from aortic tissue. CONCLUSIONS Collectively, these studies suggest that antioxidant interventions using NO-donating NSAIDs may provide an important novel therapeutic strategy to protect the diabetic endothelium.
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MESH Headings
- Acetylcholine/pharmacology
- Animals
- Anti-Inflammatory Agents, Non-Steroidal/pharmacology
- Anti-Inflammatory Agents, Non-Steroidal/therapeutic use
- Aorta, Thoracic/drug effects
- Aspirin/analogs & derivatives
- Aspirin/pharmacology
- Aspirin/therapeutic use
- Diabetes Mellitus, Experimental/drug therapy
- Diabetes Mellitus, Experimental/metabolism
- Electron Spin Resonance Spectroscopy
- Electrophoretic Mobility Shift Assay
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Free Radical Scavengers/pharmacology
- Free Radical Scavengers/therapeutic use
- Gene Expression/drug effects
- Glucose/metabolism
- Glucose/pharmacology
- Hydroxyl Radical/metabolism
- Hyperglycemia/drug therapy
- Hyperglycemia/metabolism
- Isoprostanes/metabolism
- Muscle Relaxation/drug effects
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- NF-kappa B/metabolism
- Nitric Oxide/metabolism
- Norepinephrine/pharmacology
- Rats
- Rats, Sprague-Dawley
- Superoxides/metabolism
- Vasodilation/drug effects
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Affiliation(s)
- Galen M Pieper
- Division of Transplant Surgery, Medical College of Wisconsin, Milwaukee, WI 53226, USA.
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39
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Abstract
To assess whether diabetes alters the content and/or expression of neuroactive agents and protooncogenes in afferent neurons of the vagus nerve, the nodose ganglia of streptozotocin (STZ)-induced diabetic rats were studied at 8, 16, and 24 weeks after induction of diabetes. Neuronal nitric oxide synthase (nNOS), tyrosine hydroxylase (TH), the immediate early gene c-Jun, vasoactive intestinal peptide (VIP) and calcitonin gene related peptide (CGRP) content and expression were measured in nodose ganglia of control, diabetic, and diabetic+insulin-treated rats using immunocytochemistry and reverse transcription-polymerase chain reaction (RT-PCR). The numbers of nNOS-immunoreactive (ir) neurons were increased in the nodose ganglion of diabetic compared to control rats at the 8- and 16-week time points. However, no change was noted in the nNOS mRNA content of the diabetic nodose ganglion at either time point. Moreover, no alterations in the numbers of vagal efferent NOS-containing neurons (labeled with NADPH-diaphorase histochemistry) were noted in the dorsal motor nucleus of the vagus (DMV) or the nucleus ambiguous (NA) of control, diabetic, and diabetic+insulin-treated rats at any time point. Neither the numbers of TH-ir neurons nor the content of TH mRNA was altered in the diabetic rats at the 8- and 16-week time points. However, 24 weeks of diabetes resulted in a reduction in the numbers of TH-ir neurons in the diabetic nodose ganglia when compared to control, an effect not seen in diabetic rats receiving insulin. The number of nodose ganglion neurons labeled for the protooncogene, c-Jun, was small yet slightly increased in the diabetic nodose ganglia at the 8-week time point and was reversed with insulin treatment. The increase in c-Jun-ir neurons was not found at 16 or 24 weeks of diabetes. VIP-ir and CGRP-ir were unchanged at any of the time points. These data show that diabetes affects the content of some, but not all, neuroactive agents in the nodose ganglion and may reflect a modest level of diabetes-induced damage and/or alterations in axonal transport in the vagus nerve.
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Affiliation(s)
- Jen Regalia
- Department of Pharmacology, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 20814, USA
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40
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Wang S, Shiva S, Poczatek MH, Darley-Usmar V, Murphy-Ullrich JE. Nitric oxide and cGMP-dependent protein kinase regulation of glucose-mediated thrombospondin 1-dependent transforming growth factor-beta activation in mesangial cells. J Biol Chem 2002; 277:9880-8. [PMID: 11784717 DOI: 10.1074/jbc.m108360200] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Excessive transforming growth factor-beta (TGF-beta) activity in hyperglycemia contributes to the development of diabetic nephropathy. Glucose stimulation of TGF-beta activity and matrix synthesis are dependent on autocrine thrombospondin 1 (TSP1) to convert latent TGF-beta to its biologically active form. The mechanisms by which glucose regulates TSP1 are not known. High glucose inhibits nitric oxide (NO) bioavailability and decreased NO increases TGF-beta activity and extracellular matrix accumulation. Yet, the impact of NO signaling on TSP1 activation of TGF-beta is unknown. We tested the role of NO signaling in the regulation of TSP1 expression and TSP1-dependent TGF-beta activity in rat mesangial cells exposed to high glucose. On exposure to 30 mm glucose, NO accumulation in the conditioned media and intracellular cGMP levels were significantly decreased. The addition of an NO donor prevented the glucose-dependent increase in TSP1 mRNA, protein, and TGF-beta bioactivity. The effects of the NO donor were blocked by ODQ (a soluble guanylate cyclase inhibitor) or Rp-8-pCPT-cGMPS (an inhibitor of cGMP-dependent protein kinase). These effects of high glucose were also reversed by the nitric-oxide synthase cofactor tetrahyrobiopterin (BH(4)). These results show that high glucose mediates increases in TSP1 expression and TSP1-dependent TGF-beta bioactivity through down-modulation of NO-cGMP-dependent protein kinase signaling.
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Affiliation(s)
- Shuxia Wang
- Department of Pathology, Division of Molecular and Cellular Pathology, The Cell Adhesion and Matrix Research Center, University of Alabama, Birmingham 35294-0019, USA
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41
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Joussen AM, Poulaki V, Qin W, Kirchhof B, Mitsiades N, Wiegand SJ, Rudge J, Yancopoulos GD, Adamis AP. Retinal vascular endothelial growth factor induces intercellular adhesion molecule-1 and endothelial nitric oxide synthase expression and initiates early diabetic retinal leukocyte adhesion in vivo. THE AMERICAN JOURNAL OF PATHOLOGY 2002; 160:501-9. [PMID: 11839570 PMCID: PMC1850650 DOI: 10.1016/s0002-9440(10)64869-9] [Citation(s) in RCA: 267] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Leukocyte adhesion to the diabetic retinal vasculature results in early blood-retinal barrier breakdown, capillary nonperfusion, and endothelial cell injury and death. Previous work has shown that intercellular adhesion molecule-1 (ICAM-1) and CD18 are required for these processes. However the relevant in vivo stimuli for ICAM-1 and CD18 expression in diabetes remain unknown. The current study investigated the causal role of endogenous vascular endothelial growth factor (VEGF) and nitric oxide in initiating these events. Diabetes was induced in Long-Evans rats with streptozotocin, resulting in a two- to threefold increase in retinal leukocyte adhesion. Confirmed diabetic animals were treated with a highly specific VEGF-neutralizing Flt-Fc construct (VEGF TrapA(40)). Retinal ICAM-1 mRNA levels in VEGF TrapA(40)-treated diabetic animals were reduced by 83.5% compared to diabetic controls (n = 5, P < 0.0001). VEGF TrapA(40) also potently suppressed diabetic leukocyte adhesion in retinal arterioles (47%, n = 11, P < 0.0001), venules (36%, n = 11, P < 0.0005), and capillaries (36%, n = 11, P < 0.001). The expression of endothelial nitric oxide synthase (eNOS), a downstream mediator of VEGF activity, was increased in diabetic retina, and was potently suppressed with VEGF TrapA(40) treatment (n = 8, P < 0.005). Further, VEGF TrapA(40) reduced the diabetes-related nitric oxide increases in the retinae of diabetic animals. The inhibition of eNOS with N-omega-nitro-L-arginine methyl ester also potently reduced retinal leukocyte adhesion. Although neutrophil CD11a, CD11b, and CD18 levels were increased in 1-week diabetic animals, VEGF TrapA(40) did not alter the expression of these integrin adhesion molecules. Taken together, these data demonstrate that VEGF induces retinal ICAM-1 and eNOS expression and initiates early diabetic retinal leukocyte adhesion in vivo. The inhibition of VEGF bioactivity may prove useful in the treatment of the early diabetic retinopathy.
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Affiliation(s)
| | | | - Wenying Qin
- Boston,Massachusetts; the Surgical ResearchLaboratory,†
| | - Bernd Kirchhof
- Center forOphthalmology and Zentrum für Molekulare Medizin, University ofCologne, Köln, Germany
| | | | | | - John Rudge
- Tarrytown, New York; and theDepartment of Vitreoretinal Surgery,¶
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