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Kodumuri PK, Thomas C, Jetti R, Pandey AK. Fenugreek seed extract ameliorates cognitive deficits in streptozotocin-induced diabetic rats. J Basic Clin Physiol Pharmacol 2019; 30:jbcpp-2018-0140. [PMID: 31326961 DOI: 10.1515/jbcpp-2018-0140] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 02/25/2019] [Indexed: 02/06/2023]
Abstract
Background Natural medicinal plants have been the focus of current research for developing neuroprotective agents to be used in the diabetes-linked cognitive dysfunction. Trigonella foenum-graecum seeds (known as fenugreek, methi in Hindi), is a well-known traditional medicinal herb and possesses anti-diabetic, anti-oxidant, and anti-inflammatory properties. Purpose This study was undertaken to explore the ameliorative effects of T. foenum-graecum seed extract on diabetes-induced cognitive dysfunction. Methods Experimental diabetes was induced by administering a single dose of streptozotocin (60 mg/kg) through intraperitoneal dose. Cognitive function was assessed using a T-maze and the Morris water maze. Lipid peroxidation levels and oxidative stress in the hippocampus was measured. Quantification of hippocampal CA1 and CA3 regions was done using cresyl violet stain. Results Diabetic rats demonstrated learning and memory impairment, which was evident from poor performance in behavioral tasks, i.e. T-maze and Morris water maze tasks. Learning and memory impairment in diabetic animals is associated with increased blood glucose levels, increased oxidative stress in the hippocampus and decreased number of neurons in the CA1 and CA3 regions of the hippocampus. The diabetic rats administered with T. foenum-graecum showed improved performance in behavioral tasks, and these changes were associated with decreased blood glucose levels, decreased oxidative stress in the hippocampus, and decreased neuronal loss from the CA1 and CA3 regions of the hippocampus. Conclusion In conclusion, administration of T. foenum-graecum seed extract ameliorates diabetes-linked cognitive dysfunction in rats by decreasing blood glucose levels, reducing lipid peroxidation and oxidative stress in the hippocampus, and preventing neuronal loss from the hippocampus.
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Affiliation(s)
- Praveen K Kodumuri
- Tomo Riba Institute of Health and Medical Sciences, Physiology, Old Assembly Complex,Naharlagun, India.,Department of Physiology, Varun Arjun Medical College and Rohilkand Hospital, Banthra, Shahjahanpur (Uttar Pradesh), India
| | - Christofer Thomas
- Department of Physiology, Sapthagiri Institute of Medical Science and Research Center, Bangalore, India
| | - Raghu Jetti
- Department of Basic Medical Sciences, College of Applied Medical Sciences, King Khalid University, Abha, Kingdom of Saudi Arabia
| | - Anil Kumar Pandey
- ESIC Medical College, Physiology, Faridabad, India.,Department of Physiology, ESIC Medical College and Hospital, Faridabad, Haryana, India, Phone: + 91-7042918222
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Oliveira PS, Chaves VC, Soares MSP, Bona NP, Mendonça LT, Carvalho FB, Gutierres JM, Vasconcellos FA, Vizzotto M, Vieira A, Spanevello RM, Reginatto FH, Lencina CL, Stefanello FM. Southern Brazilian native fruit shows neurochemical, metabolic and behavioral benefits in an animal model of metabolic syndrome. Metab Brain Dis 2018; 33:1551-1562. [PMID: 29882020 DOI: 10.1007/s11011-018-0262-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 05/29/2018] [Indexed: 01/03/2023]
Abstract
In this work, we evaluated the effects of Psidium cattleianum (Red Type) (PcRT) fruit extract on metabolic, behavioral, and neurochemical parameters in rats fed with a highly palatable diet (HPD) consisted of sucrose (65% carbohydrates being 34% from condensed milk, 8% from sucrose and 23% from starch, 25% protein and 10% fat). Animals were divided into 4 groups: standard chow, standard chow + PcRT extract (200 mg/Kg/day by gavage), HPD, HPD + extract. The animals were treated for 150 days. Concerning chemical profiling, LC/PDA/MS/MS analysis revealed cyanidin-3-O-glucoside as the only anthocyanin in the PcRT extract. Our results showed that the animals exposed to HPD presented glucose intolerance, increased weight gain and visceral fat, as well as higher serum levels of glucose, triacylglycerol, total cholesterol, LDL-cholesterol and interleukin-6. These alterations were prevented by PcRT. In addition, HPD caused an increase in immobility time in a forced swimming test and the fruit extract prevented this alteration, indicating an antidepressant-like effect. PcRT treatment also prevented increased acetylcholinesterase activity in the prefrontal cortex caused by HPD consumption. Moreover, PcRT extract was able to restore Ca2+-ATPase activity in the prefrontal cortex, hippocampus, and striatum, as well as Na+,K+-ATPase activity in the prefrontal cortex and hippocampus. PcRT treatment decreased thiobarbituric acid-reactive substances, nitrite, and reactive oxygen species levels and prevented the reduction of superoxide dismutase activity in all cerebral structures of the HPD group. Additionally, HPD decreased catalase in the hippocampus and striatum. However, the extract prevented this change in the hippocampus. Our results showed that this berry extract has antihyperglycemic and antihyperlipidemic effects, and neuroprotective properties, proving to be a potential therapeutic agent for individuals with metabolic syndrome.
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Affiliation(s)
- Pathise Souto Oliveira
- Laboratório de Biomarcadores, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS, Brazil
| | - Vitor Clasen Chaves
- Laboratório de Farmacognosia, Programa de Pós-Graduação em Biotecnologia e Biociências, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Mayara Sandrielly Pereira Soares
- Laboratório de Neuroquímica, Inflamação e Câncer, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS, Brazil
| | - Natália Pontes Bona
- Laboratório de Biomarcadores, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS, Brazil
| | - Lorenço Torres Mendonça
- Laboratório de Biomarcadores, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS, Brazil
| | - Fabiano Barbosa Carvalho
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Jessié Martins Gutierres
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica Toxicológica, Departamento de Bioquímica e Biologia Molecular, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Flávia Aleixo Vasconcellos
- Laboratório de Química Aplicada a Bioativos, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS, Brazil
| | - Marcia Vizzotto
- Empresa Brasileira de Pesquisa Agropecuária, Centro de Pesquisa Agropecuária de Clima Temperado, Pelotas, RS, Brazil
| | - Andriele Vieira
- Laboratório de Fisiopatologia, Programa de Pós-Graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil
| | - Roselia Maria Spanevello
- Laboratório de Neuroquímica, Inflamação e Câncer, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS, Brazil
| | - Flávio Henrique Reginatto
- Laboratório de Farmacognosia, Programa de Pós-Graduação em Biotecnologia e Biociências, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Claiton Leoneti Lencina
- Laboratório de Biomarcadores, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS, Brazil
| | - Francieli Moro Stefanello
- Laboratório de Biomarcadores, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS, Brazil.
- Universidade Federal de Pelotas, Campus Universitário s/n, CEP, Capão do Leão, RS, 96160-000, Brazil.
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Catanzaro OL, Capponi JA, Di Martino I, Labal ES, Sirois P. Oxidative stress in the optic nerve and cortical visual area of steptozotocin-induced diabetic Wistar rats: Blockade with a selective bradykinin B 1 receptor antagonist. Neuropeptides 2017; 66:97-102. [PMID: 29089149 DOI: 10.1016/j.npep.2017.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 08/07/2017] [Accepted: 10/19/2017] [Indexed: 01/13/2023]
Abstract
The role of bradykinin B1 receptors on the oxidative stress as measured by the levels of Na+/K+ ATPase activity, malondialdehyde (MDA) and glutathione (GSH) in male Wistar rat optic nerve and visual cortex area 1 and 4weeks after STZ treatment was studied. Rats were divided into 4 groups (n=6-7): 1. Controls (non-diabetics); 2. Diabetics (65mg/kg streptozotocin, STZ); 3. Diabetics injected with B1 antagonist R-954 (2mg/Kg) during the last 3days of a one week period; 4. Diabetics injected with B1 antagonist R-954 (2mg/Kg) during the last 3days of a 4week period. The results showed that plasma glucose levels increased by up to 4 fold in diabetic rats 1 or 4weeks following the STZ treatment. R-954 treatment did significantly decrease blood glucose levels. Levels of MDA was increased in the plasma of the 1 and 4week diabetic animals whereas the GSH levels were decreased. Both markers returned to normal following R-954 treatment. Na+/K+ ATPase activity significantly decreased in the optic nerve and visual cortex of diabetic rats at 1 and 4weeks but returned to normal following R-954 treatment. MDA levels increased markedly at 1 and 4weeks compared with control levels in the optic nerve but slightly in the visual cortex and returned to control levels in both tissues following R-954 treatment. GSH levels decreased in both tissues at 1 and 4weeks compared with control levels. Following administration of the selective BKB1R antagonist R-954, the levels of GSH returned to normal in both tissues of the 1 and 4week diabetic animals. These results showed that the inducible BKB1 receptors are associated with the oxidative stress in the optic nerve and cortical visual area of diabetic rats and suggested that BKB1-R antagonist R-954 could have a beneficial role in the treatment of diabetic retinopathy.
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Affiliation(s)
- Orlando L Catanzaro
- Departamento de Biología y Bioquímica, Laboratorio de Diabetes Experimental, Universidad Argentina John F Kennedy, Buenos Aires, Argentina; Escuela de Medicina y Odontologia -USAL, Buenos Aires, Argentina.
| | - Jorgelina Aira Capponi
- Departamento de Biología y Bioquímica, Laboratorio de Diabetes Experimental, Universidad Argentina John F Kennedy, Buenos Aires, Argentina
| | - Irene Di Martino
- Departamento de Biología y Bioquímica, Laboratorio de Diabetes Experimental, Universidad Argentina John F Kennedy, Buenos Aires, Argentina
| | - Emilio S Labal
- Departamento de Biología y Bioquímica, Laboratorio de Diabetes Experimental, Universidad Argentina John F Kennedy, Buenos Aires, Argentina
| | - Pierre Sirois
- CHUL Research Center, Laval University, Québec, Canada
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Mohamed N, Gawad HA. Taurine dietary supplementation attenuates brain, thyroid, testicular disturbances and oxidative stress in streptozotocin-induced diabetes mellitus in male rats. BENI-SUEF UNIVERSITY JOURNAL OF BASIC AND APPLIED SCIENCES 2017. [DOI: 10.1016/j.bjbas.2017.04.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Oliveira PS, Chaves VC, Bona NP, Soares MSP, Cardoso JDS, Vasconcellos FA, Tavares RG, Vizzotto M, Silva LMCD, Grecco FB, Gamaro GD, Spanevello RM, Lencina CL, Reginatto FH, Stefanello FM. Eugenia uniflora fruit (red type) standardized extract: a potential pharmacological tool to diet-induced metabolic syndrome damage management. Biomed Pharmacother 2017; 92:935-941. [DOI: 10.1016/j.biopha.2017.05.131] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 05/22/2017] [Accepted: 05/28/2017] [Indexed: 11/25/2022] Open
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Properties of Na,K-ATPase in cerebellum of male and female rats: effects of acute and prolonged diabetes. Mol Cell Biochem 2016; 425:25-36. [DOI: 10.1007/s11010-016-2859-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 10/22/2016] [Indexed: 02/07/2023]
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7
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Kaločayová B, Mézešová L, Barteková M, Vlkovičová J, Jendruchová V, Vrbjar N. Effect of duration of diabetes mellitus type 1 on properties of Na, K-ATPase in cerebral cortex. Mol Cell Biochem 2015; 405:41-52. [DOI: 10.1007/s11010-015-2394-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 03/27/2015] [Indexed: 01/28/2023]
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Centella asiatica Attenuates Diabetes Induced Hippocampal Changes in Experimental Diabetic Rats. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:592062. [PMID: 25161691 PMCID: PMC4139016 DOI: 10.1155/2014/592062] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Accepted: 07/01/2014] [Indexed: 12/14/2022]
Abstract
Diabetes mellitus has been reported to affect functions of the hippocampus. We hypothesized that Centella asiatica, a herb traditionally being used to improve memory, prevents diabetes-related hippocampal dysfunction. Therefore, the aim of this study was to investigate the protective role of C. asiatica on the hippocampus in diabetes. Methods. Streptozotocin- (STZ-) induced adult male diabetic rats received 100 and 200 mg/kg/day body weight (b.w) C. asiatica leaf aqueous extract for four consecutive weeks. Following sacrifice, hippocampus was removed and hippocampal tissue homogenates were analyzed for Na(+)/K(+)-, Ca(2+)- and Mg(2+)-ATPases activity levels. Levels of the markers of inflammation (tumor necrosis factor, TNF-α; interleukin, IL-6; and interleukin, IL-1β) and oxidative stress (lipid peroxidation product: LPO, superoxide dismutase: SOD, catalase: CAT, and glutathione peroxidase: GPx) were determined. The hippocampal sections were visualized for histopathological changes. Results. Administration of C. asiatica leaf aqueous extract to diabetic rats maintained near normal ATPases activity levels and prevents the increase in the levels of inflammatory and oxidative stress markers in the hippocampus. Lesser signs of histopathological changes were observed in the hippocampus of C. asiatica leaf aqueous extract treated diabetic rats. Conclusions. C. asiatica leaf protects the hippocampus against diabetes-induced dysfunction which could help to preserve memory in this condition.
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Prasad SN, Muralidhara. Protective effects of geraniol (a monoterpene) in a diabetic neuropathy rat model: Attenuation of behavioral impairments and biochemical perturbations. J Neurosci Res 2014; 92:1205-16. [DOI: 10.1002/jnr.23393] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 02/26/2014] [Accepted: 03/18/2014] [Indexed: 12/29/2022]
Affiliation(s)
- Sathya N. Prasad
- Department of Biochemistry and Nutrition; CSIR-Central Food Technological Research Institute (CFTRI); Karnataka India
| | - Muralidhara
- Department of Biochemistry and Nutrition; CSIR-Central Food Technological Research Institute (CFTRI); Karnataka India
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Kalafatakis K, Zarros A. Intracerebroventricular administration of streptozotocin as an experimental approach to Alzheimer's disease. Int J Neurosci 2014; 124:944-6. [DOI: 10.3109/00207454.2014.890934] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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11
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Zarros A, Liapi C, Al-Humadi H, Almpani M, Stolakis V, Skandali N, Voumvourakis K, Katsouni E, Tsakiris S. Experimentally-induced Wernicke's encephalopathy modifies crucial rat brain parameters: the importance of Na+, K+ -ATPase and a potentially neuroprotective role for antioxidant supplementation. Metab Brain Dis 2013; 28:387-96. [PMID: 23475222 DOI: 10.1007/s11011-013-9394-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2013] [Accepted: 02/26/2013] [Indexed: 10/27/2022]
Abstract
Wernicke's encephalopathy (WE) is a serious neuropsychiatric syndrome caused by chronic alcoholism and thiamine (T) deficiency. Our aim was to shed more light on the pathophysiology of WE, by introducing a modified in vivo experimental model of WE and by focusing on changes provoked in the total antioxidant status (TAS) and three crucial brain enzyme activities in adult rats. Rats were placed on ethanol (EtOH) consumption (20 % v/v) for a total of 5 weeks. By the end of the third week, rats were fed a T-deficient diet (TDD) and were treated with pyrithiamine (PT; 0.25 mg/kg) for the remaining 2 weeks. Following the induction of WE symptomatology, rats were treated with three consecutive (every 8 h) injections of saline or T (100 mg/kg) and were sacrificed. Brain homogenates were generated and used for spectrophotometrical evaluation of TAS and enzymatic activities. Additionally, in vitro experiments were conducted on brain homogenates or pure enzymes incubated with T or neuromodulatory antioxidants. Pre-exposure to EtOH provided a successful protocol modification that did not affect the expected time of WE symptomatology onset. Administration of T ameliorated this symptomatology. WE provoked oxidative stress that was partially limited by T administration, while T itself also caused oxidative stress to a smaller extent. Brain acetylcholinesterase (AChE) was found inhibited by WE and was further inhibited by T administration. In vitro experiments demonstrated a potential neuroprotective role for L-carnitine (Carn). Brain sodium-potassium adenosine triphosphatase (Na(+),K(+)-ATPase) activity was found increased in WE and was reduced to control levels by in vivo T administration; this increase was also evident in groups exposed to PT or to TDD, but not to EtOH. In vitro experiments demonstrated a potential neuroprotective role for this Na(+),K(+)-ATPase stimulation through T or L-cysteine (Cys) administration. Brain magnesium adenosine triphosphatase (Mg(2+)-ATPase) activity was found decreased by prolonged exposure to EtOH, but was not affected by the experimental induction of WE. Our data suggest that T administration inhibits AChE, which is also found inhibited in WE. Moreover, increased brain Na(+),K(+)-ATPase activity could be a marker of T deficiency in WE, while combined T and antioxidant co-supplementation of Cys and/or Carn could be neuroprotective in terms of restoring the examined crucial brain enzyme activities to control levels.
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Affiliation(s)
- Apostolos Zarros
- Laboratory of Physiology, Medical School, National and Kapodistrian University of Athens, PO Box 65257, 15401, Athens, Greece
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Garcia CC, Potian JG, Hognason K, Thyagarajan B, Sultatos LG, Souayah N, Routh VH, McArdle JJ. Acetylcholinesterase deficiency contributes to neuromuscular junction dysfunction in type 1 diabetic neuropathy. Am J Physiol Endocrinol Metab 2012; 303:E551-61. [PMID: 22739110 PMCID: PMC3423102 DOI: 10.1152/ajpendo.00622.2011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 06/02/2012] [Indexed: 12/19/2022]
Abstract
Diabetic neuropathy is associated with functional and morphological changes of the neuromuscular junction (NMJ) associated with muscle weakness. This study examines the effect of type 1 diabetes on NMJ function. Swiss Webster mice were made diabetic with three interdaily ip injections of streptozotocin (STZ). Mice were severely hyperglycemic within 7 days after the STZ treatment began. Whereas performance of mice on a rotating rod remained normal, the twitch tension response of the isolated extensor digitorum longus to nerve stimulation was reduced significantly at 4 wk after the onset of STZ-induced hyperglycemia. This mechanical alteration was associated with increased amplitude and prolonged duration of miniature end-plate currents (mEPCs). Prolongation of mEPCs was not due to expression of the embryonic acetylcholine receptor but to reduced muscle expression of acetylcholine esterase (AChE). Greater sensitivity of mEPC decay time to the selective butyrylcholinesterase (BChE) inhibitor PEC suggests that muscle attempts to compensate for reduced AChE levels by increasing expression of BChE. These alterations of AChE are attributed to STZ-induced hyperglycemia since similar mEPC prolongation and reduced AChE expression were found for db/db mice. The reduction of muscle end-plate AChE activity early during the onset of STZ-induced hyperglycemia may contribute to endplate pathology and subsequent muscle weakness during diabetes.
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Affiliation(s)
- Carmen C Garcia
- Dept. of Pharmacology and Physiology, New Jersey Medical School-UMDNJ, MSB-I626, 185 South Orange Ave., Newark, NJ 07101-1709, USA
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Sung JY, Park SB, Liu YT, Kwai N, Arnold R, Krishnan AV, Lin CSY. Progressive axonal dysfunction precedes development of neuropathy in type 2 diabetes. Diabetes 2012; 61:1592-8. [PMID: 22522615 PMCID: PMC3357264 DOI: 10.2337/db11-1509] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
To evaluate the development of diabetic neuropathy, the current study examined changes in peripheral axonal function. Nerve excitability techniques were undertaken in 108 type 2 diabetic patients with nerve conduction studies (NCS), HbA(1c) levels, and total neuropathy score (TNS). Patients were categorized into two cohorts: patients with diabetes without neuropathy (DWN group [n = 56]) and patients with diabetes with neuropathy (DN group [n = 52]) and further into severity grade 0 (TNS 0-1 [n = 35]), grade 1 (TNS 2-8 [n = 42]), and grade 2/3 (TNS 9-24 [n = 31]). Results revealed that the DWN group had a significantly increased threshold, prolonged latency, and changes in excitability parameters compared with age-matched control subjects. Patients with neuropathy demonstrated significant alteration in recovery cycle parameters and depolarizing threshold electrotonus. Within the DWN cohort, there were significant correlations between HbA(1c) level and latency and subexcitability, whereas the estimated glomerular filtration rate correlated with superexcitability in patients with neuropathy. Furthermore, excitability parameters became progressively more abnormal with increasing clinical severity. These results suggest a spectrum of excitability abnormalities in patients with diabetes and that early axonal dysfunction may be detected prior to the development of neuropathy. As progressive changes in excitability parameters correlated to neuropathy severity, excitability testing may provide a biomarker of the early development and severity of diabetic neuropathy, providing insights into the pathophysiological mechanisms producing axonal dysfunction.
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Affiliation(s)
- Jia-Ying Sung
- Department of Neurology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Susanna B. Park
- Neuroscience Research Australia and Prince of Wales Clinical School, University of New South Wales, Randwick, Sydney, New South Wales, Australia
| | - Ya-Ting Liu
- Department of Neurology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Natalie Kwai
- School of Medical Sciences and Translational Neuroscience Facility, Faculty of Medicine, University of New South Wales, Randwick, Sydney, New South Wales, Australia
| | - Ria Arnold
- School of Medical Sciences and Translational Neuroscience Facility, Faculty of Medicine, University of New South Wales, Randwick, Sydney, New South Wales, Australia
| | - Arun V. Krishnan
- School of Medical Sciences and Translational Neuroscience Facility, Faculty of Medicine, University of New South Wales, Randwick, Sydney, New South Wales, Australia
| | - Cindy S.-Y. Lin
- Department of Neurology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
- School of Medical Sciences and Translational Neuroscience Facility, Faculty of Medicine, University of New South Wales, Randwick, Sydney, New South Wales, Australia
- Corresponding author: Cindy S.-Y. Lin,
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Sahin K, Tuzcu M, Orhan C, Agca CA, Sahin N, Guvenc M, Krejpcio Z, Staniek H, Hayirli A. The effects of chromium complex and level on glucose metabolism and memory acquisition in rats fed high-fat diet. Biol Trace Elem Res 2011; 143:1018-30. [PMID: 21120707 DOI: 10.1007/s12011-010-8905-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2010] [Accepted: 11/11/2010] [Indexed: 02/05/2023]
Abstract
Conditions in which glucose metabolism is impaired due to insulin resistance are associated with memory impairment. It was hypothesized that supplemental chromium (Cr) may alleviate insulin resistance in type 2 diabetes and consequently improve memory acquisition, depending upon its source and level. In a complete randomized design experiment, male Wistar rats (n=60; weighing 200-220 g) were fed either normal (8%, normal diet (ND)) or high-fat (40%, high-fat diet (HFD)) diet and supplemented with Cr as either chromium-glycinate (CrGly) or chromium-acetate (CrAc) at doses of 0, 40, or 80 μg/kg body weight (BW) via drinking water from 8 to 20 weeks of age. Feeding HFD induced type 2 diabetes, as reflected by greater glucose/insulin ratio (2.98 vs. 2.74) comparing to feeding ND. Moreover, HFD rats had greater BW (314 vs. 279 g) and less serum (53 vs. 68 μg/L) and brain (14 vs. 24 ng/g) Cr concentrations than ND rats. High-fat diet caused a 32% reduction in expressions of glucose transporters 1 and 3 (GLUTs) in brain tissue and a 27% reduction in mean percentage time spent in the target quadrant and a 38% increase in spatial memory acquisition phase (SMAP) compared with ND. Compared with supplemental Cr as CrAc, CrGly was more effective to ameliorate response variables (i.e., restoration of tissue Cr concentration, enhancement of cerebral GLUTs expressions, and reduction of the glucose/insulin ratio and SMAP) in a dose-response manner, especially in rats fed HFD. Supplemental Cr as CrGly may have therapeutic potential to enhance insulin action and alleviate memory acquisition in a dose-dependent manner, through restoring tissue Cr reserve and enhancing cerebral GLUTs expressions.
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Affiliation(s)
- Kazim Sahin
- Department of Animal Nutrition, Faculty of Veterinary Medicine, Firat University, 23119, Elazig, Turkey.
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Yankuzo H, Ahmed QU, Santosa RI, Akter SFU, Talib NA. Beneficial effect of the leaves of Murraya koenigii (Linn.) Spreng (Rutaceae) on diabetes-induced renal damage in vivo. JOURNAL OF ETHNOPHARMACOLOGY 2011; 135:88-94. [PMID: 21354289 DOI: 10.1016/j.jep.2011.02.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2010] [Revised: 02/08/2011] [Accepted: 02/17/2011] [Indexed: 05/30/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Murraya koenigii (Linn.) Spreng (curry leaf) is widely used as a nephroprotective agent in kidney's infirmities among diabetics by the traditional practitioners in Malaysia. However, the latter role of curry leaf has been grossly under reported and is yet to receive proper scientific evaluation. AIM OF THE STUDY The present study was designed to investigate the beneficial effect of the leaves of Murraya koenigii (Linn.) on diabetes-induced renal damage in vivo with regard to prove its efficacy by local traditional practitioners in the treatment of kidney frailties in diabetics. MATERIALS AND METHODS Aqueous (AQ) extract of the leaves of Murraya koenigii (Linn.) was administered to both normal and streptozotocin (STZ) induced diabetic male rats (Sprague-Dawley strain). Animals were divided into six groups (n=6) and treated with variable dose levels of AQ extract (200 and 400mg/kg body weight/day) for 30 days. At the end of 30 days, animals were sacrificed, blood was collected, processed and stored at -70°C for the zestimation of serum urea and creatinine, changes in plasma antioxidant capacity by FRAP assay, and glutathione peroxidase levels, in the normal and STZ-induced diabetic rats. Histological changes of the kidneys of these animals were also evaluated by light microscopy to determine the beneficial effect of the leaves. RESULTS Daily oral administration of variable dose levels of the AQ extract for 30 days, produced significant dose dependant decrease in serum urea and creatinine levels (p<0.001), and marked increase in the levels of plasma antioxidant capacity (p<0.01) in diabetic treated rats, compared to the control (non-diabetic) subjects. However, the normal treated rats showed minimal variation in these parameters in comparison to normal controls. Histological studies of the kidneys of these animals showed comparable tissue regeneration by the AQ extract. CONCLUSION The results of our study scientifically support the traditional belief for using the leaves of Murraya koenigii (Linn.) as adjuvant, in the treatment of pain disorders related to renal impairments among diabetics.
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Affiliation(s)
- Hassan Yankuzo
- Department of Basic Medical Sciences, Faculty of Medicine, International Islamic University Malaysia, 25200 Kuantan, Pahang, Darul Makmur, Malaysia
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Liapi C, Kyriakaki A, Zarros A, Galanopoulou P, Al-Humadi H, Dontas I, Voumvourakis K, Tsakiris S. Choline-deprivation alters crucial brain enzyme activities in a rat model of diabetic encephalopathy. Metab Brain Dis 2010; 25:269-76. [PMID: 20838865 DOI: 10.1007/s11011-010-9205-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2009] [Accepted: 04/29/2010] [Indexed: 10/19/2022]
Abstract
Diabetic encephalopathy describes the moderate cognitive deficits, neurophysiological and structural central nervous system changes associated with untreated diabetes. It involves neurotoxic effects such as the generation of oxidative stress, the enhanced formation of advanced glycation end-products, as well as the disturbance of calcium homeostasis. Due to the direct connection of choline (Ch) with acetylcholine availability and signal transduction, a background of Ch-deficiency might be unfavorable for the pathology and subsequently for the treatment of several metabolic brain diseases, including that of diabetic encephalopathy. The aim of this study was to shed more light on the effects of adult-onset streptozotocin (STZ)-induced diabetes and/or Ch-deprivation on the activities of acetylcholinesterase (AChE) and two important adenosine triphosphatases, namely Na(+),K(+)-ATPase and Mg(2+)-ATPase. Male adult Wistar rats were divided into four main groups, as follows: control (C), diabetic (D), Ch-deprived (CD), and Ch-deprived diabetic (D+CD). Deprivation of Ch was provoked through the administration of Ch-deficient diet. Both the induction of diabetes and the beginning of dietary-mediated provoking of Ch-deprivation occurred at the same day, and rats were killed by decapitation after 30 days (1 month; groups C1, D1, CD1 and D1+CD1) and 60 days (2 months; groups C2, D2, CD2 and D2+CD2, respectively). The adult rat brain AChE activity was found to be significantly increased by both diabetes (+10%, p < 0.001 and +11%, p < 0.01) and Ch-deprivation (+19%, p < 0.001 and +14%, p < 0.001) when compared to the control group by the end of the first (C1) and the second month (C2), respectively. However, the Ch-deprived diabetic rats' brain AChE activity was significantly altered only after a 60-day period of exposure, resulting in a +27% increase (D2+CD2 vs. C2, p < 0.001). Although the only significant change recorded in the brain Na(+),K(+)-ATPase activity after the end of the first month is attributed to Ch-deprivation (+21%, p < 0.05, CD1 vs. C1), all groups of the second month exhibited a statistically significant decrease in brain Na(+),K(+)-ATPase activity (-24%, p < 0.01, D2 vs. C2; -21%, p < 0.01, CD2 vs. C2; -22%, p < 0.01, D2+CD2 vs. C2). As concerns Mg(2+)-ATPase, the enzyme's activity demonstrates no significant changes, with the sole exception of the D2+CD2 group (+21%, p < 0.05, D2+CD2 vs. C2). In addition, statistically significant time-dependent changes concerning the brain Mg(2+)-ATPase activity were recorded within the diabetic (p < 0.05, D2 vs. D1) and the Ch-deprived (p < 0.05, CD2 vs. CD1) rat groups. Our data indicate that Ch-deprivation seems to be an undesirable background for the above-mentioned enzymatic activities under untreated diabetes, in a time-evolving way. Further studies on the issue should focus on a region-specific reevaluation of these crucial enzymes' activities as well as on the possible oxidative mechanisms involved.
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Affiliation(s)
- Charis Liapi
- Department of Pharmacology, Medical School, National & Kapodistrian University of Athens, Athens, Greece
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Nakhaee A, Bokaeian M, Akbarzadeh A, Hashemi M. Sodium tungstate attenuate oxidative stress in brain tissue of streptozotocin-induced diabetic rats. Biol Trace Elem Res 2010; 136:221-31. [PMID: 19834650 DOI: 10.1007/s12011-009-8537-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2009] [Accepted: 09/30/2009] [Indexed: 02/02/2023]
Abstract
High blood glucose concentration in diabetes induces free radical production and, thus, causes oxidative stress. Damage of cellular structures by free radicals play an important role in development of diabetic complications. In this study, we evaluated effects of sodium tungstate on enzymatic and nonenzymatic markers of oxidative stress in brain of streptozotocin (STZ)-induced diabetic rats. Rats were divided into four groups (ten rats in each group): untreated control, sodium tungstate-treated control, untreated diabetic, and sodium tungstate-treated diabetic. Diabetes was induced with an intraperitoneal STZ injection (65 mg/kg body weight), and sodium tungstate with concentration of 2 g/L was added to drinking water of treated animals for 4 weeks. Diabetes caused a significant increase in the brain thiobarbituric acid reactive substances (P < 0.01) and protein carbonyl levels (P < 0.01) and a decrease in ferric reducing antioxidant power (P < 0.01). Moreover, diabetic rats presented a reduction in brain glucose-6-phosphate dehydrogenase (21%), superoxide dismutase (41%), glutathione peroxidase (19%), and glutathione reductase (36%) activities. Sodium tungstate reduced the hyperglycemia and restored the diabetes-induced changes in all mentioned markers of oxidative stress. However, catalase activity was not significantly affected by diabetes (P = 0.4), while sodium tungstate caused a significant increase in enzyme activity of treated animals (P < 0.05). Data of present study indicated that sodium tungstate can ameliorate brain oxidative stress in STZ-induced diabetic rats, probably by reducing of the high glucose-induced oxidative stress and/or increasing of the antioxidant defense mechanisms.
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Affiliation(s)
- Alireza Nakhaee
- Department of Clinical Biochemistry, School of Medicine, Zahedan University of Medical Sciences, Zahedan, Iran.
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