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Tocharus C, Sutheerawattananonda M. Hypoglycemic Ability of Sericin-Derived Oligopeptides (SDOs) from Bombyx mori Yellow Silk Cocoons and Their Physiological Effects on Streptozotocin (STZ)-Induced Diabetic Rats. Foods 2024; 13:2184. [PMID: 39063270 PMCID: PMC11276246 DOI: 10.3390/foods13142184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Revised: 07/01/2024] [Accepted: 07/08/2024] [Indexed: 07/28/2024] Open
Abstract
Patients with diabetes require daily medication to maintain blood sugar levels. Nevertheless, the long-term use of antidiabetics can lose efficacy and cause degeneration in some patients. For long-term diabetes care, integrating natural dietary foods and medicine is being considered. This study investigated the impact of SDOs on blood sugar levels and their physiological effects on diabetic rats. We induced diabetes in male Wistar rats with STZ (50 mg/kg) and then administered an oral glucose tolerance test to determine the SDO dosage comparable to glibenclamide. The rats were divided into nine groups: normal, diabetic, and diabetic with insulin (10 U/kg), glibenclamide (0.6 mg/kg), bovine serum albumin (BSA; 200 mg/kg), soy protein isolate (200 mg/kg), or SDOs (50, 100, and 200 mg/kg). Diabetic rats administered SDOs had a higher body weight and serum insulin but a lower blood sugar than diabetic control rats. Biochemical assays indicated lower AST/SGOT, ALT/SGPT, BUN, and triglycerides but higher HDL in the SDO groups. Immunohistochemistry showed that SDOs reduced damaged islet cells, increased beta-cell size, and improved insulin levels while decreasing alpha cell size and glucagon. The vascular effects of SDOs were like those of normal control treatment and insulin treatment in diabetic rats. SDOs, a yellow silk protein, show potential for long-term diabetes care.
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Affiliation(s)
- Chainarong Tocharus
- Department of Anatomy, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand;
| | - Manote Sutheerawattananonda
- School of Food Technology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
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Heyns IM, Arora M, Ganugula R, Allamreddy SR, Tiwari S, Shah DK, Basu R, Ravi Kumar MNV. Polyester Nanoparticles with Controlled Topography for Peroral Drug Delivery Using Insulin as a Model Protein. ACS NANO 2024; 18:11863-11875. [PMID: 38622996 PMCID: PMC11145941 DOI: 10.1021/acsnano.4c01027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Receptor-mediated polyester drug delivery systems have tremendous potential for improving the clinical performance of existing pharmaceutical drugs. Despite significant progress made in this area, it remains unclear how and to what extent the polyester nanoparticle surface topography would affect the in vitro, ex vivo and in vivo performance of a drug, and if there exists a correlation between in vitro and in vivo, as well as healthy versus pathophysiological states. Herein, we report a systematic investigation of the interactions between ligands and receptors as a function of the linker length, two-carbon (2C) versus four-carbon (4C). The in vitro, ex vivo and in vivo in healthy models validate the hypothesis that 4C has better reach and binding to the receptors. The results indicate that 4C offered better performance over 2C in vivo in improving the oral bioavailability of insulin (INS) by 1.1-fold (3.5-fold compared to unfunctionalized nanoparticles) in a healthy rat model. Similar observations were made in pathophysiological models; however, the effects were less prominent compared to those in healthy models. Throughout, ligand decorated nanoparticles outperformed unfunctionalized nanoparticles. Finally, a semimechanistic pharmacokinetic and pharmacodynamic (PKPD) model was developed using the experimental data sets to quantitatively evaluate the effect of P2Ns-GA on oral bioavailability and efficacy of insulin. The study presents a sophisticated oral delivery system for INS or hydrophilic therapeutic cargo, highlighting the significant impact on bioavailability that minor adjustments to the surface chemistry can have.
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Affiliation(s)
- Ingrid Marie Heyns
- The Center for Convergent Bioscience and Medicine (CCBM), The University of Alabama, Tuscaloosa, AL 35401, United States
- Division of Translational Science and Medicine, College of Community Health Sciences, The University of Alabama, Tuscaloosa, AL 35401, United States
- Alabama Life Research Institute, The University of Alabama, Tuscaloosa, AL 35401, United States
| | - Meenakshi Arora
- The Center for Convergent Bioscience and Medicine (CCBM), The University of Alabama, Tuscaloosa, AL 35401, United States
- Division of Translational Science and Medicine, College of Community Health Sciences, The University of Alabama, Tuscaloosa, AL 35401, United States
- Alabama Life Research Institute, The University of Alabama, Tuscaloosa, AL 35401, United States
- Department of Biological Sciences, The University of Alabama, SEC 1325, Tuscaloosa, AL 35487, United States
| | - Raghu Ganugula
- The Center for Convergent Bioscience and Medicine (CCBM), The University of Alabama, Tuscaloosa, AL 35401, United States
- Division of Translational Science and Medicine, College of Community Health Sciences, The University of Alabama, Tuscaloosa, AL 35401, United States
- Alabama Life Research Institute, The University of Alabama, Tuscaloosa, AL 35401, United States
- Department of Biological Sciences, The University of Alabama, SEC 1325, Tuscaloosa, AL 35487, United States
| | - Swetha Reddy Allamreddy
- The Center for Convergent Bioscience and Medicine (CCBM), The University of Alabama, Tuscaloosa, AL 35401, United States
- Division of Translational Science and Medicine, College of Community Health Sciences, The University of Alabama, Tuscaloosa, AL 35401, United States
- Alabama Life Research Institute, The University of Alabama, Tuscaloosa, AL 35401, United States
| | - Shrusti Tiwari
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, The State University of New York at Buffalo, 455 Pharmacy Building, Buffalo, NY 14214, United States
| | - Dhaval K. Shah
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, The State University of New York at Buffalo, 455 Pharmacy Building, Buffalo, NY 14214, United States
| | - Rita Basu
- Division of Endocrinology, Diabetes, and Metabolism, School of Medicine, Marnix E. Heersink School of Medicine, The University of Alabama, Birmingham, AL 35294, United States
| | - M. N. V. Ravi Kumar
- The Center for Convergent Bioscience and Medicine (CCBM), The University of Alabama, Tuscaloosa, AL 35401, United States
- Division of Translational Science and Medicine, College of Community Health Sciences, The University of Alabama, Tuscaloosa, AL 35401, United States
- Alabama Life Research Institute, The University of Alabama, Tuscaloosa, AL 35401, United States
- Department of Biological Sciences, The University of Alabama, SEC 1325, Tuscaloosa, AL 35487, United States
- Chemical and Biological Engineering, University of Alabama, SEC 3448, Tuscaloosa, AL 35487, United States
- Center for Free Radical Biology, University of Alabama at Birmingham, Birmingham, AL 35294, United States
- Nephrology Research and Training Center, Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, United States
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Ukwenya VO, Alese MO, Ogunlade B, Folorunso IM, Omotuyi OI. Anacardium occidentale leaves extract and riboceine mitigate hyperglycemia through anti-oxidative effects and modulation of some selected genes associated with diabetes. J Diabetes Metab Disord 2023; 22:455-468. [PMID: 37255827 PMCID: PMC10225389 DOI: 10.1007/s40200-022-01165-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 11/24/2022] [Indexed: 06/01/2023]
Abstract
Background Diabetes mellitus (DM) is one of the leading causes of death globally and complications of DM have become a major health concern. Anacardium occidentale is a plant widely recognized for its hypoglycemic properties and traditionally used in developing nations as remedy for DM treatment. Riboceine is a supplement that enhances production of glutathione and known for its vital role in supporting cellular function. This study was designed to evaluate the antidiabetic and antioxidant potential of riboceine and ethanolic extract of A. occidentale leaves in streptozotocin (STZ)-induced diabetic rats. Method Twenty-nine adult male Wistar rats were induced with DM intraperitoneally using a single dose of STZ (70 mg/kg). The STZ-induced rats were divided into groups and administered the same dose (100 mg/kg) of A. occidentale leaves extract and riboceine via gastric gavage at the dose (100 mg/kg) for seventeen days while metformin (40 mg/kg) was used as positive control. Fasting blood glucose and weight of the model rats were examined periodically. Activities of total protein, creatinine, urea, antioxidants (SOD, GSH and GPX), and level of serum insulin were determined. Expression of diabetes related genes including pancreas (Insulin, pdx-1, P16NK4A, and Mki-67), Liver (FAS, ACC, and GFAT) and KIM-1 genes were also determined. Results Data showed that treatment of STZ-induced diabetic rats with A. occidentale and riboceine at the same dose significantly (p < 0.05) ameliorated hyperglycemic effects by improving hepatic and renal functions and antioxidants, preventing hepatic fat accumulation by downregulation of ACC, FAS and GFAT expression, improving β-cell functions through up-regulation of pancreatic insulin, P16NK4A, Mki-67 and pdx-1 expression. Induction of diabetes upregulated mRNA expression of KIM-1, which was ameliorated after treatment of the rats with A. occidentale and riboceine. Conclusion The results obtained in this study demonstrate significant antidiabetic properties of ethanolic extract of A. occidentale and riboceine.
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Affiliation(s)
- Victor Okoliko Ukwenya
- Department of Human Anatomy, School of Basic Medical Sciences, College of Health Sciences, Federal University of Technology, Akure, P.M.B 704 Nigeria
| | - Margaret Olutayo Alese
- Department of Anatomy, Faculty of Basic Medical Sciences, College of Medicine, Ekiti State University, Ado Ekiti, Nigeria
| | - Babatunde Ogunlade
- Department of Human Anatomy, School of Basic Medical Sciences, College of Health Sciences, Federal University of Technology, Akure, P.M.B 704 Nigeria
| | - Ibukun Mary Folorunso
- Department of Biochemistry, School of Life Sciences, Federal University of Technology, Akure, Nigeria
| | - Olaposi Idowu Omotuyi
- Institute for Drug Research and Development, Afe Babalola University, Ado-Ekiti, Nigeria
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The purinergic signalling and inflammation in the pathogenesis and progression of diabetes: key factors and therapeutic targets. Inflamm Res 2022; 71:759-770. [PMID: 35648156 DOI: 10.1007/s00011-022-01587-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 05/10/2022] [Indexed: 11/27/2022] Open
Abstract
Type 2 diabetes mellitus (T2DM) is an important chronic disease around the world, and according to the World Health Organization, it is the 9th principal cause of global death. This pathology is characterized by high levels of circulating glucose as a result of insulin resistance, and it is well stated that inflammation related to obesity is directly associated with the development of the disease. The purinergic signalling is involved in both pancreatic destruction, which impairs insulin secretion, and the cytokine production that favors insulin resistance in T2DM. In this review, the purinergic signalling aspects will be discussed, showing the impact of the enzymes, nucleotides, nucleosides, and receptors of this system and the cytokines that result in inflammation, in the development and progression of T2DM, besides, pointing the purinergic receptors as a possible therapeutic approach.
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Streptozotocin-Induced Diabetes in a Mouse Model (BALB/c) Is Not an Effective Model for Research on Transplantation Procedures in the Treatment of Type 1 Diabetes. Biomedicines 2021; 9:biomedicines9121790. [PMID: 34944607 PMCID: PMC8698562 DOI: 10.3390/biomedicines9121790] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/23/2021] [Accepted: 11/25/2021] [Indexed: 12/14/2022] Open
Abstract
Type 1 diabetes (T1D) is characterized by the destruction of over 90% of the β-cells. C-peptide is a parameter for evaluating T1D. Streptozotocin (STZ) is a standard method of inducing diabetes in animals. Eight protocols describe the administration of STZ in mice; C-peptide levels are not taken into account. The aim of the study is to determine whether the STZ protocol for the induction of beta-cell mass destruction allows for the development of a stable in vivo mouse model for research into new transplant procedures in the treatment of type 1 diabetes. Materials and methods: Forty BALB/c mice were used. The animals were divided into nine groups according to the STZ dose and a control group. The STZ doses were between 140 and 400 mg/kg of body weight. C-peptide was taken before and 2, 7, 9, 12, 14, and 21 days after STZ. Immunohistochemistry was performed. The area of the islet and insulin-/glucagon-expressing tissues was calculated. Results: Mice who received 140, 160, 2 × 100, 200, and 250 mg of STZ did not show changes in mean fasting C-peptide in comparison to the control group and to day 0. All animals with doses of 300 and 400 mg of STZ died during the experiment. The area of the islets did not show any differences between the control and STZ-treated mice in groups below 300 mg. The reduction of insulin-positive areas in STZ mice did not exceed 50%. Conclusions: Streptozotocin is not an appropriate method of inducing a diabetes model for further research on transplantation treatments of type 1 diabetes, having caused the destruction of more than 90% of the β-cell mass in BALB/c mice.
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Nfe2l1 deficiency mitigates streptozotocin-induced pancreatic β-cell destruction and development of diabetes in male mice. Food Chem Toxicol 2021; 158:112633. [PMID: 34699923 DOI: 10.1016/j.fct.2021.112633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 10/07/2021] [Accepted: 10/19/2021] [Indexed: 11/22/2022]
Abstract
Streptozotocin (STZ) is a pancreatic β cell-specific toxicant that is widely used to generate models of diabetes in rodents as well as in the treatment of tumors derived from pancreatic β cells. DNA alkylation, oxidative stress and mitochondrial toxicity have been recognized as the mechanisms for STZ-induced pancreatic β cell damage. Here, we found that pancreatic β cell-specific deficiency of nuclear factor erythroid-derived factor 2-related factor 1 (NFE2L1), a master regulator of the cellular adaptive response to a variety of stresses, in mice led to a dramatic resistance to STZ-induced hyperglycemia. Indeed, fifteen days subsequent to last dosage of STZ, the pancreatic β cell specific Nfe2l1 knockout [Nfe2l1(β)-KO] mice showed reduced hyperglycemia, improved glucose tolerance, higher plasma insulin and more intact islets surrounded by exocrine acini compared to the Nfe2l1-Flox control mice with the same treatment. Immunohistochemistry staining revealed a greater amount of insulin-positive cells in the pancreas of Nfe2l1(β)-KO mice than those in Nfe2l1-Flox mice 15 days after the last STZ injection. In line with this observation, both isolated Nfe2l1(β)-KO islets and Nfe2l1-deficient MIN6 (Nfe2l1-KD) cells were resistant to STZ-induced toxicity and apoptosis. Furthermore, pretreatment of the MIN6 cells with glycolysis inhibitor 2-Deoxyglucose sensitized Nfe2l1-KD cells to STZ-induced toxicity. These findings demonstrated that loss of Nfe2l1 attenuates pancreatic β cells damage and dysfunction caused by STZ exposure, partially due to Nfe2l1 deficiency-induced metabolic switch to enhanced glycolysis.
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Atmodjo WL, Larasati YO, Jo J, Nufika R, Naomi S, Winoto I. Relationship Between Insulin-Receptor Substrate 1 and Langerhans' Islet in a Rat Model of Type 2 Diabetes Mellitus. In Vivo 2021; 35:291-297. [PMID: 33402476 DOI: 10.21873/invivo.12258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 10/26/2020] [Accepted: 10/28/2020] [Indexed: 12/24/2022]
Abstract
BACKGROUND/AIM In vivo studies on pathogenesis of type 2 diabetes mellitus (T2DM) have been reported, however, the relationship between insulin-receptor substrate 1 (IRS1) and the area of Langerhans' islets was unknown. Therefore, a correlation between both parameters was assessed. MATERIALS AND METHODS Diabetic groups were fed with a high-fat diet (HFD) and injected with three different doses of streptozotocin, namely 25, 35 and 45 mg/kg, and compared to a control group after 9 weeks. RESULTS Administration of HFD/streptozotocin increased the level of fasting blood glucose but reduced the level of IRS1 and the area of Langerhans' islets in diabetic groups. The coefficient of correlation between IRS1 and area of Langerhans' islets was 0.259 (p=0.232). In addition, the coefficient of correlation for fasting blood glucose with the area of Langerhans' islets and IRS1 was -0.520 (p=0.011) and -0.603 (p=0.002), respectively. CONCLUSION The reduction of IRS1 was weakly correlated with the destruction of Langerhans' islets, suggesting there is an intermediate step between both parameters.
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Affiliation(s)
- Wahyuni Lukita Atmodjo
- Department of Immunopathology, Mochtar Riady Institute for Nanotechnology, Tangerang, Indonesia; .,Department of Anatomy, Faculty of Medicine, Universitas Pelita Harapan, Tangerang, Indonesia
| | - Young Othiwi Larasati
- Department of Immunopathology, Mochtar Riady Institute for Nanotechnology, Tangerang, Indonesia
| | - Juandy Jo
- Program of Biology, Faculty of Science and Technology, Universitas Pelita Harapan, Tangerang, Indonesia
| | - Riska Nufika
- Department of Immunopathology, Mochtar Riady Institute for Nanotechnology, Tangerang, Indonesia
| | - Steffi Naomi
- Department of Biomedicine, Indonesia International Institute for Life Science, Jakarta, Indonesia
| | - Imelda Winoto
- Department of Immunopathology, Mochtar Riady Institute for Nanotechnology, Tangerang, Indonesia
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1-Palmitoyl-2-Linoleoyl-3-Acetyl- rac-Glycerol Attenuates Streptozotocin-Induced Pancreatic Beta Cell Damage by Promoting Glucose Transporter 2 Endocytosis. Mol Cell Biol 2019; 39:MCB.00157-19. [PMID: 31481450 PMCID: PMC6791655 DOI: 10.1128/mcb.00157-19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 08/14/2019] [Indexed: 01/09/2023] Open
Abstract
Streptozotocin (STZ) is widely used to induce diabetic rodent models. It is specifically toxic to pancreatic beta cells and causes severe destruction and dysfunction. We investigated the effect of 1-palmitoyl-2-linoleoyl-3-acetyl-rac-glycerol (PLAG) on an STZ-induced diabetic mouse model. PLAG attenuated the glucose increase and maintained serum insulin at levels similar to those seen with control mice. Streptozotocin (STZ) is widely used to induce diabetic rodent models. It is specifically toxic to pancreatic beta cells and causes severe destruction and dysfunction. We investigated the effect of 1-palmitoyl-2-linoleoyl-3-acetyl-rac-glycerol (PLAG) on an STZ-induced diabetic mouse model. PLAG attenuated the glucose increase and maintained serum insulin at levels similar to those seen with control mice. In pancreatic beta cell line INS-1, STZ-induced cell apoptosis and intracellular reactive oxygen species (ROS) generation were significantly reduced to nearly normal levels after PLAG treatment. Glucose transporter 2 (GLUT2) localization analyses and glucose uptake assays showed that PLAG accelerated GLUT2 internalization, which ameliorated excessive entry of glucose, as well as STZ. STZ-induced cytotoxic effects were significantly reduced in PLAG-treated groups. The biological activity of PLAG was further confirmed in GLUT2-silenced cells, and the specificity of PLAG was verified using its derivative 1-palmitoyl-2-linoleoyl-3-hydroxyl-rac-glycerol (PLH). Our results suggest that PLAG may be a useful agent for protecting beta cells in the setting of excessive glucose influx.
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Chow LWC, Cheng KS, Leong F, Cheung CW, Shiao LR, Leung YM, Wong KL. Enhancing tetrandrine cytotoxicity in human lung carcinoma A549 cells by suppressing mitochondrial ATP production. Naunyn Schmiedebergs Arch Pharmacol 2018; 392:427-436. [PMID: 30547225 DOI: 10.1007/s00210-018-01601-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 12/06/2018] [Indexed: 12/12/2022]
Abstract
ATP depletion induced by inhibiting glycolysis or mitochondrial ATP production has been demonstrated to cause cancer cell death. Whether ATP depletion can enhance the efficacy and potency of anti-cancer effects of herbal compounds is so far unknown. We examined the enhancing effect of ATP depletion on anti-cancer actions of tetrandrine (TET) in human lung carcinoma A549 cells. A 24-h incubation of A549 cells with tetrandrine caused a concentration-dependent cytotoxic effect (LC50 = 66.1 μM). Co-incubation with 20 mM 2-deoxyglucose (2-DG, glycolysis inhibitor) caused only a very slight enhancement of tetrandrine cytotoxicity. By contrast, inhibiting mitochondrial ATP production with oligomycin (10 μM, ATP synthase inhibitor) and FCCP (30 μM, uncoupling agent) (thus, oligo-FCCP) on its own caused only slight cell cytotoxicity but strongly potentiated tetrandrine cytotoxicity (tetrandrine LC50 = 15.6 μM). The stronger enhancing effect of oligo-FCCP than 2-DG on TET toxicity did not result from more severe overall ATP depletion, since both treatments caused a similar ATP level suppression. Neither oligo-FCCP nor 2-DG synergized with tetrandrine in decreasing mitochondrial membrane potential. TET on its own triggered reactive oxygen species (ROS) production, and oligo-FCCP, but not 2-DG, potentiated TET in causing ROS production. Taken together, our results suggest that inhibiting ATP production from mitochondria, but not from glycolysis, appears to be a very effective means in augmenting TET-triggered ROS production and hence toxicity in A549 cells.
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Affiliation(s)
- Louis W C Chow
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau, China
- UNIMED Medical Institute and Organisation for Oncology and Translational Research, Hong Kong, China
- Organisation for Oncology and Translational Research, Hong Kong, China
| | - Ka-Shun Cheng
- Department of Anesthesiology, China Medical University Hospital, Taichung, Taiwan
| | - Fai Leong
- Department of Anaesthesiology of Centro Hospitalar conde de Sao Januario, Macao Health Bureau, Macau, SAR, China
| | - Chi-Wai Cheung
- Laboratory and Clinical Research Institute for Pain, Department of Anaesthesiology, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Lian-Ru Shiao
- Department of Physiology, China Medical University, No.91, Hsueh-Shih Road, Taichung, 40402, Taiwan, Republic of China
| | - Yuk-Man Leung
- Department of Physiology, China Medical University, No.91, Hsueh-Shih Road, Taichung, 40402, Taiwan, Republic of China.
| | - Kar-Lok Wong
- Department of Anesthesiology, China Medical University Hospital, Taichung, Taiwan.
- Laboratory and Clinical Research Institute for Pain, Department of Anaesthesiology, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, China.
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Madhuri K, Naik PR. Ameliorative effect of borneol, a natural bicyclic monoterpene against hyperglycemia, hyperlipidemia and oxidative stress in streptozotocin-induced diabetic Wistar rats. Biomed Pharmacother 2017; 96:336-347. [DOI: 10.1016/j.biopha.2017.09.122] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 09/19/2017] [Accepted: 09/23/2017] [Indexed: 11/15/2022] Open
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Elucidation of Molecular Mechanisms of Streptozotocin-Induced Oxidative Stress, Apoptosis, and Mitochondrial Dysfunction in Rin-5F Pancreatic β-Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:7054272. [PMID: 28845214 PMCID: PMC5563420 DOI: 10.1155/2017/7054272] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 06/12/2017] [Accepted: 07/02/2017] [Indexed: 01/12/2023]
Abstract
Streptozotocin is a pancreatic beta-cell-specific cytotoxin and is widely used to induce experimental type 1 diabetes in rodent models. The precise molecular mechanism of STZ cytotoxicity is however not clear. Studies have suggested that STZ is preferably absorbed by insulin-secreting β-cells and induces cytotoxicity by producing reactive oxygen species/reactive nitrogen species (ROS/RNS). In the present study, we have investigated the mechanism of cytotoxicity of STZ in insulin-secreting pancreatic cancer cells (Rin-5F) at different doses and time intervals. Cell viability, apoptosis, oxidative stress, and mitochondrial bioenergetics were studied. Our results showed that STZ induces alterations in glutathione homeostasis and inhibited the activities of the respiratory enzymes, resulting in inhibition of ATP synthesis. Apoptosis was observed in a dose- and time-dependent manner. Western blot analysis has also confirmed altered expression of oxidative stress markers (e.g., NOS and Nrf2), cell signaling kinases, apoptotic protein-like caspase-3, PARP, and mitochondrial specific proteins. These results suggest that STZ-induced cytotoxicity in pancreatic cells is mediated by an increase in oxidative stress, alterations in cellular metabolism, and mitochondrial dysfunction. This study may be significant in better understanding the mechanism of STZ-induced β-cell toxicity/resistance and the etiology of type 1 diabetes induction.
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El-Far YM, Zakaria MM, Gabr MM, El Gayar AM, Eissa LA, El-Sherbiny IM. Nanoformulated natural therapeutics for management of streptozotocin-induced diabetes: potential use of curcumin nanoformulation. Nanomedicine (Lond) 2017. [DOI: 10.2217/nnm-2017-0106] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Aim: The goal of this study was to improve curcumin (CUR) aqueous solubility and bioavailability via nanoformulation, and then study its activity and mechanism of action as an antidiabetic agent. Methods: CUR-loaded pluronic nanomicelles (CURnp) were prepared and characterized. Biochemical assessments were performed as well as histological, confocal and RTPCR studies on pancreatic target tissues. Results: CURnp with a diameter of 333 ± 6 nm and ζ potential of -26.1 mv were obtained. Antidiabetic action of CURnp was attributed to significant upregulation of Pdx-1 and NKx6.1 gene expression and achievement of optimum redox balance, which led to alleviation of streptozotocin-induced β-cell damage via a significant upregulation in insulin gene expression proved by RTPCR studies and by the presence of 40% insulin positive cells through confocal microscope studies on pancreatic tissue.
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Affiliation(s)
- Yousra M El-Far
- Department of Biochemistry, Faculty of Pharmacy, Mansoura University, 35516, Egypt
| | | | | | - Amal M El Gayar
- Department of Biochemistry, Faculty of Pharmacy, Mansoura University, 35516, Egypt
| | - Laila A Eissa
- Department of Biochemistry, Faculty of Pharmacy, Mansoura University, 35516, Egypt
| | - Ibrahim M El-Sherbiny
- Center for Materials Science, University of Science & Technology, Zewail City of Science & Technology, 6th October City, 12588 Giza, Egypt
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Khidr BM, El-Sokkary GH, Saleh SM. Study on morphological changes induced by aspartame on liver of normal and diabetic male albino rats. Histol Histopathol 2017. [DOI: 10.7243/2055-091x-4-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Al-Harbi MS, Hamza RZ. Potential Ameliorative Effects of Selenium and Chromium Supplementation Against Toxicity and Oxidative Stress in Streptozotocin Diabetic Rats. INT J PHARMACOL 2016. [DOI: 10.3923/ijp.2016.483.495] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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15
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Attanayake AP, Jayatilaka KAPW, Pathirana C, Mudduwa LKB. Gmelina arborea Roxb. (Family: Verbenaceae) Extract Upregulates the β-Cell Regeneration in STZ Induced Diabetic Rats. J Diabetes Res 2016; 2016:4513871. [PMID: 26881248 PMCID: PMC4736759 DOI: 10.1155/2016/4513871] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 11/12/2015] [Accepted: 12/01/2015] [Indexed: 11/17/2022] Open
Abstract
Gmelina arborea Roxb. (common name: Et-demata, Family: Verbenaceae) has been used traditionally in Sri Lanka as a remedy against diabetes mellitus. The objective of the present study was to evaluate antidiabetic mechanisms of the aqueous bark extract of G. arborea in streptozotocin induced (STZ) diabetic male Wistar rats. Aqueous bark extract of G. arborea (1.00 g/kg) and glibenclamide as the standard drug (0.50 mg/kg) were administered orally using a gavage to STZ diabetic rats (65 mg/kg, ip) for 30 days. The antidiabetic mechanisms of aqueous extract of G. arborea (1.00 g/kg) were determined at the end of the experiment. The fasting blood glucose concentration was significantly lowered and the serum insulin and C-peptide concentrations were increased by 57% and 39% in plant extract treated rats on day 30, respectively (p < 0.05). The histopathology and immunohistochemistry results of the plant extract treated group showed a regenerative effect on β-cells of the pancreas in diabetic rats. In addition, serum lipid parameters were improved in G. arborea extract treated diabetic rats. The results revealed that the aqueous stem bark extract of G. arborea (1.00 g/kg) showed beneficial effects against diabetes mellitus through upregulating the β-cell regeneration and biosynthesis of insulin in diabetic rats.
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Affiliation(s)
- Anoja Priyadarshani Attanayake
- Department of Biochemistry, Faculty of Medicine, University of Ruhuna, 80000 Galle, Sri Lanka
- *Anoja Priyadarshani Attanayake:
| | | | - Chitra Pathirana
- Department of Biochemistry, Faculty of Medicine, University of Ruhuna, 80000 Galle, Sri Lanka
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Challenges and issues with streptozotocin-induced diabetes - A clinically relevant animal model to understand the diabetes pathogenesis and evaluate therapeutics. Chem Biol Interact 2015; 244:49-63. [PMID: 26656244 DOI: 10.1016/j.cbi.2015.11.032] [Citation(s) in RCA: 196] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 11/18/2015] [Accepted: 11/26/2015] [Indexed: 02/07/2023]
Abstract
Streptozotocin (STZ) has been extensively used over the last three decades to induce diabetes in various animal species and to help screen for hypoglycemic drugs. STZ induces clinical features in animals that resemble those associated with diabetes in humans. For this reason STZ treated animals have been used to study diabetogenic mechanisms and for preclinical evaluation of novel antidiabetic therapies. However, the physiochemical characteristics and associated toxicities of STZ are still major obstacles for researchers using STZ treated animals to investigate diabetes. Another major challenges in STZ-induced diabetes are sustaining uniformity, suitability, reproducibility and induction of diabetes with minimal animal lethality. Lack of appropriate use of STZ was found to be associated with increased mortality and animal suffering. During STZ use in animals, attention should be paid to several factors such as method of preparation of STZ, stability, suitable dose, route of administration, diet regimen, animal species with respect to age, body weight, gender and the target blood glucose level used to represent hyperglycemia. Therefore, protocol for STZ-induced diabetes in experimental animals must be meticulously planned. This review highlights specific skills and strategies involved in the execution of STZ-induced diabetes model. The present review aims to provide insight into diabetogenic mechanisms of STZ, specific toxicity of STZ with its significance and factors responsible for variations in diabetogenic effects of STZ. Further this review also addresses ways to minimize STZ-induced mortality, suggests methods to improve STZ-based experimental models and best utilize them for experimental studies purported to understand diabetes pathogenesis and preclinical evaluation of drugs.
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Koksal B. Effect of Streptozotocin on Plasma Insulin Levels of Rats and Mice: A Meta-analysis Study. Open Access Maced J Med Sci 2015; 3:380-3. [PMID: 27275254 PMCID: PMC4877823 DOI: 10.3889/oamjms.2015.093] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Revised: 08/17/2015] [Accepted: 08/18/2015] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND: In the studies focusing on diabetic organisms, Streprozotocine (STZ) is a frequently used agent to induce diabetes in rats and mice. However the current studies do not represent practical importance of their statistical findings. For showing practical importance of the differences in plasma insulin levels of diabetic rats and mice induced by STZ, there should be a statistical synthesis regarding statistical findings of the studies. AIM: The purpose of this study is to make a meta-analysis of the studies on the effect of STZ on plasma insulin levels in diabetic rats and mice. MATERIALS AND METHODS: In this study 39 effect sizes (37 studies) about levels of plasma insulin were analyzed by calculating individual effect sizes (d) and mean effect size. RESULTS: The effect sizes were between -13.7 and +65.3 and the mean effect size value (+9.33) represented a large effect indicating that STZ was an effective agent to significantly decrease plasma insulin levels of diabetic rats and mice. CONCLUSION: It can be said that the differences in plasma insulin levels between STZ-applied and no application groups has a practical importance in making animal model of diabetes.
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Affiliation(s)
- Burcu Koksal
- Inonu University, Department of Physiology, Inonu University, Faculty of Medicine, Malatya 44280, Turkey
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18
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Non-receptor tyrosine kinase inhibitors enhances β-cell survival by suppressing the PKCδ signal transduction pathway in streptozotocin – induced β-cell apoptosis. Cell Signal 2015; 27:1066-74. [DOI: 10.1016/j.cellsig.2015.01.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2014] [Revised: 01/12/2015] [Accepted: 01/17/2015] [Indexed: 11/17/2022]
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López-Acosta JF, Villa-Pérez P, Fernández-Díaz CM, Román DDL, Díaz-Marrero AR, Cueto M, Perdomo G, Cózar-Castellano I. Protective effects of epoxypukalide on pancreatic β-cells and glucose metabolism in STZ-induced diabetic mice. Islets 2015; 7:e1078053. [PMID: 26406478 PMCID: PMC4878260 DOI: 10.1080/19382014.2015.1078053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Diabetes is a consequence of a decrease on functional β-cell mass. We have recently demonstrated that epoxypukalide (Epoxy) is a natural compound with beneficial effects on primary cultures of rat islets. In this study, we extend our previous investigations to test the hypothesis that Epoxy protects β-cells and improves glucose metabolism in STZ-induced diabetic mice. We used 3-months old male mice that were treated with Epoxy at 200 μg/kg body weight. Glucose intolerance was induced by multiple intraperitoneal low-doses of streptozotocin (STZ) on 5 consecutive days. Glucose homeostasis was evaluated measuring plasma insulin levels and glucose tolerance. Histomorphometry was used to quantify the number of pancreatic β-cells per islet. β-cell proliferation was assessed by BrdU incorporation, and apoptosis by TUNEL staining. Epoxy treatment significantly improved glucose tolerance and plasma insulin levels. These metabolic changes were associated with increased β-cell numbers, as a result of a two-fold increase in β-cell proliferation and a 50% decrease in β-cell death. Our results demonstrate that Epoxy improves whole-body glucose homeostasis by preventing pancreatic β-cell death due to STZ-induced toxicity in STZ-treated mice.
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Affiliation(s)
- Jose F López-Acosta
- Instituto de Genética y Biología Molecular (University of Valladolid-CSIC); Valladolid, Spain
- These authors contributed equally to this work
| | - Pablo Villa-Pérez
- Instituto de Genética y Biología Molecular (University of Valladolid-CSIC); Valladolid, Spain
- These authors contributed equally to this work
| | | | - Daniel de Luis Román
- Svo Endocrinología y Nutrición HCUVA; Centro de Investigación de Endocrinología y Nutrición (University of Valladolid); Valladolid, Spain
| | - Ana R Díaz-Marrero
- Departamento de Química Orgánica; Instituto Universitario de Bioorgánica “Antonio González” -CIBICAN; University of La Laguna; San Cristóbal de La Laguna, Spain
| | - Mercedes Cueto
- Instituto de Productos Naturales y Agrobiología (CSIC); La Laguna, Tenerife, Spain
| | - Germán Perdomo
- Facultad de Ciencias Ambientales y Bioquimica; University of Castilla-La Mancha; Toledo, Spain
| | - Irene Cózar-Castellano
- Instituto de Genética y Biología Molecular (University of Valladolid-CSIC); Valladolid, Spain
- Correspondence to: Irene Cózar-Castellano;
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Antihyperglycaemic, antihyperlipidaemic and β cell regenerative effects of Spondias pinnata (Linn. f.) Kurz. bark extract on streptozotocin induced diabetic rats. Eur J Integr Med 2014. [DOI: 10.1016/j.eujim.2014.03.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kaur M, Bedi O, Sachdeva S, Reddy BVKK, Kumar P. Rodent animal models: from mild to advanced stages of diabetic nephropathy. Inflammopharmacology 2014; 22:279-93. [PMID: 25149089 PMCID: PMC7101706 DOI: 10.1007/s10787-014-0215-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2014] [Accepted: 08/08/2014] [Indexed: 12/13/2022]
Abstract
Diabetic nephropathy (DN) is a secondary complication of both type 1 and type 2 diabetes, resulting from uncontrolled high blood sugar. 30-40% of diabetic patients develop DN associated with a poor life expectancy and end-stage renal disease, causing serious socioeconomic problems. Although an exact pathogenesis of DN is still unknown, several factors such as hyperglycemia, hyperlipidemia, hypertension and proteinuria may contribute to the progression of renal damage in diabetic nephropathy. DN is confirmed by measuring blood urea nitrogen, serum creatinine, creatinine clearance and proteinuria. Clinical studies show that intensive control of hyperglycemia and blood pressure could successfully reduce proteinuria, which is the main sign of glomerular lesions in DN, and improve the renal prognosis in patients with DN. Diabetic rodent models have traditionally been used for doing research on pathogenesis and developing novel therapeutic strategies, but have limitations for translational research. Diabetes in animal models such as rodents are induced either spontaneously or by using chemical, surgical, genetic, or other techniques and depicts many clinical features or related phenotypes of the disease. This review discusses the merits and demerits of the models, which are used for many reasons in the research of diabetes and diabetic complications.
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Affiliation(s)
- Manpreet Kaur
- Pharmacology Division, Department of Pharmacology, ISF College of Pharmacy, Moga, 142001 Punjab India
| | - Onkar Bedi
- Pharmacology Division, Department of Pharmacology, ISF College of Pharmacy, Moga, 142001 Punjab India
| | - Shilpi Sachdeva
- Pharmacology Division, Department of Pharmacology, ISF College of Pharmacy, Moga, 142001 Punjab India
| | - B. V. K. Krishna Reddy
- Pharmacology Division, Department of Pharmacology, ISF College of Pharmacy, Moga, 142001 Punjab India
| | - Puneet Kumar
- Pharmacology Division, Department of Pharmacology, ISF College of Pharmacy, Moga, 142001 Punjab India
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Yassa HD, Tohamy AF. Extract of Moringa oleifera leaves ameliorates streptozotocin-induced Diabetes mellitus in adult rats. Acta Histochem 2014; 116:844-54. [PMID: 24657072 DOI: 10.1016/j.acthis.2014.02.002] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Revised: 02/05/2014] [Accepted: 02/06/2014] [Indexed: 12/31/2022]
Abstract
Medicinal plants attract growing interest in the therapeutic management of Diabetes mellitus. Moringa oleifera is a remarkably nutritious vegetable with several antioxidant properties. The present study assessed the possible antioxidant and antidiabetic effects of an aqueous extract of M. oleifera leaves in treating streptozotocin-induced diabetic albino rats. The antidiabetic effects of aqueous extract of M. oleifera leaves were assessed histomorphometrically, ultrastructurally and biochemically. Fasting plasma glucose (FPG) was monitored and morphometric measurements of β-cells of islets of Langerhans (modified Gomori's stain) and collagen fibers (Mallory's trichrome stain) were performed. The antioxidant effects of M. oleifera leaves were determined by measuring the reduced glutathione and lipid peroxidation product, malondialdehyde, in pancreatic tissue. M. oleifera treatment significantly ameliorated the altered FPG (from 380% to 145%), reduced glutathione (from 22% to 73%) and malondialdehyde (from 385% to 186%) compared to control levels. The histopathological damage of islet cells was also markedly reversed. Morphometrically, M. oleifera significantly increased the areas of positive purple modified Gomori stained β-cells (from 60% to 91%) and decreased the area percentage of collagen fibers (from 199% to 120%) compared to control values. Experimental findings clearly indicate the potential benefits of using the aqueous extract of M. oleifera leaves as a potent antidiabetic treatment.
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Kharbanda C, Sarwar Alam M, Hamid H, Bano S, Haider S, Nazreen S, Ali Y, Javed K. Trapa natans L. root extract suppresses hyperglycemic and hepatotoxic effects in STZ-induced diabetic rat model. JOURNAL OF ETHNOPHARMACOLOGY 2014; 151:931-936. [PMID: 24333959 DOI: 10.1016/j.jep.2013.12.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 11/21/2013] [Accepted: 12/03/2013] [Indexed: 06/03/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Trapa natans L. has a folkloric reputation as nutrient, appetizer and astringent. Its utility as antidiabetic, anticancer, diuretic, aphrodisiac, antidiarrhoeal and in many other maladies is well reported in the literature. Therefore, the present study has been carried out to study the antihyperglycemic effect of root extract of Trapa natans L. and its various fractions. Furthermore, hepatotoxic effects and lipid peroxidation risks have also been evaluated. METHODS The ethanol extract and its successive fractions obtained from roots of Trapa natans have been administered in sucrose loaded and STZ- induced diabetic Wistar rats at doses of 50, 100 and 200mg/kg b.w. Glibenclamide was used as positive control. The evaluation of protective effects of extract as well as fractions against hepatotoxicity and lipid peroxidation at 600mg/kg b.w. has also been carried out. RESULTS The methanol fraction emerged as the most potent antihyperglycemic fraction. It has also been found that the ethanolic extract as well as its fractions did not cause any lipid peroxidation and hepatotoxicity risks. CONCLUSION It can be concluded that the intense investigations of the methanol fraction obtained from Trapa natans root extract can be done to provide an alternative natural therapy for hyperglycemia.
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Affiliation(s)
- Chetna Kharbanda
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi-110062, India
| | - Mohammad Sarwar Alam
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi-110062, India.
| | - Hinna Hamid
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi-110062, India
| | - Sameena Bano
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi-110062, India
| | - Saqlain Haider
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi-110062, India
| | - Syed Nazreen
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi-110062, India
| | - Yakub Ali
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi-110062, India
| | - Kalim Javed
- Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi-110062, India
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Abdel Aziz MT, El-Asmar MF, Rezq AM, Mahfouz SM, Wassef MA, Fouad HH, Ahmed HH, Taha FM. The effect of a novel curcumin derivative on pancreatic islet regeneration in experimental type-1 diabetes in rats (long term study). Diabetol Metab Syndr 2013; 5:75. [PMID: 24279645 PMCID: PMC4176754 DOI: 10.1186/1758-5996-5-75] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 11/07/2013] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Several studies highlight curcumin's benefit as a hypoglycemic agent, however; a limited number of reports present the importance of curcumin in improvement of pancreatic islets in diabetes. The aim of the present study is to evaluate the antidiabetic effect of a novel curcumin derivative and its effect on pancreatic islet regeneration in type I diabetes-induced by STZ. MATERIALS AND METHODS Rats were divided into diabetic rats and diabetic rats treated orally with the novel curcumin derivative (NCD) for 40 days. Fasting blood samples were withdrawn periodically from all rats to estimate plasma glucose, insulin and C-peptide for 10 months. Histopathology was performed to allow the assessment of pancreatic islet morphology. Insulin and CD105 were detected immunohistochemically. RESULTS In diabetic rats, the plasma glucose, insulin and C-peptide levels remained within the diabetic range for about 4 months, after which a gradual decrease in glucose and increase in insulin and C-peptide was observed, which reached almost normal levels after 10 months. NCD treated diabetic rats showed significantly lowered plasma glucose and increased plasma insulin and C-peptide levels. This was followed by a further significant decrease in plasma glucose and increase in plasma insulin and C-peptide after two months from oral administration of the NCD. The plasma insulin and C-peptide continued to increase for ten months reaching levels significantly higher than the basal level. Histopathological examination of diabetic rat pancreas revealed absence of islets of Langerhans, minimal adipose tissue infiltration and localized lymphocytic infiltrates. However, after 6 months of induction of diabetes, rat pancreas showed the appearance of small well formed islets and positive insulin cells but no CD105 positive cells. NCD treated rats showed the appearance of primitive cell collections, large insulin positive cells and CD105 positive cells in the adipose tissue infiltrating the pancreatic tissues. This was followed by the gradual appearance of insulin positive cells in the islets while, CD 105 positive cells remained in the adipose tissue. After 5 and 10 months from the onset of diabetes, rat pancreas showed, well developed larger sized islets with disappearance of primitive cell collections and CD 105 positive cells. Also, insulin positive islets of variable size with disappearance of insulin positive cells in adipose tissue were detected. CONCLUSION The NCD possesses antidiabetic actions and enhanced pancreatic islets regeneration.
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Affiliation(s)
- Mohamed T Abdel Aziz
- Unit of Biochemistry and Molecular Biology, the Medical Biochemistry Department, Faculty of Medicine, Cairo University, Kasr El Aini, Cairo, Egypt
| | - Mohamed F El-Asmar
- Medical Biochemistry Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Ameen M Rezq
- Unit of Biochemistry and Molecular Biology, the Medical Biochemistry Department, Faculty of Medicine, Cairo University, Kasr El Aini, Cairo, Egypt
| | - Soheir M Mahfouz
- Pathology Department Faculty of Medicine, Cairo University, Cairo, Egypt
| | - Mohamed A Wassef
- Unit of Biochemistry and Molecular Biology, the Medical Biochemistry Department, Faculty of Medicine, Cairo University, Kasr El Aini, Cairo, Egypt
| | - Hanan H Fouad
- Unit of Biochemistry and Molecular Biology, the Medical Biochemistry Department, Faculty of Medicine, Cairo University, Kasr El Aini, Cairo, Egypt
| | - Hanan H Ahmed
- Unit of Biochemistry and Molecular Biology, the Medical Biochemistry Department, Faculty of Medicine, Cairo University, Kasr El Aini, Cairo, Egypt
| | - Fatma M Taha
- Unit of Biochemistry and Molecular Biology, the Medical Biochemistry Department, Faculty of Medicine, Cairo University, Kasr El Aini, Cairo, Egypt
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Abstract
The pancreas is an organ with a central role in nutrient breakdown, nutrient sensing and release of hormones regulating whole body nutrient homeostasis. In diabetes mellitus, the balance is broken-cells can be starving in the midst of plenty. There are indications that the incidence of diabetes type 1 and 2, and possibly pancreatogenic diabetes, is rising globally. Events leading to insulin secretion and action are complex, but there is emerging evidence that intracellular nucleotides and nucleotides are not only important as intracellular energy molecules but also as extracellular signalling molecules in purinergic signalling cascades. This signalling takes place at the level of the pancreas, where the close apposition of various cells-endocrine, exocrine, stromal and immune cells-contributes to the integrated function. Following an introduction to diabetes, the pancreas and purinergic signalling, we will focus on the role of purinergic signalling and its changes associated with diabetes in the pancreas and selected tissues/organ systems affected by hyperglycaemia and other stress molecules of diabetes. Since this is the first review of this kind, a comprehensive historical angle is taken, and common and divergent roles of receptors for nucleotides and nucleosides in different organ systems will be given. This integrated picture will aid our understanding of the challenges of the potential and currently used drugs targeted to specific organ/cells or disorders associated with diabetes.
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Affiliation(s)
- Geoffrey Burnstock
- Autonomic Neuroscience Centre, University College Medical School, Rowland Hill Street, London, NW3 2PF UK
- Department of Pharmacology, Melbourne University, Melbourne, Australia
| | - Ivana Novak
- Molecular and Integrative Physiology, Department of Biology, University of Copenhagen, August Krogh Building, Universitetsparken 13, 2100 Copenhagen Ø, Denmark
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The effects of a hydroalcoholic extract of silymarin on serum lipids profiles in streptozotocin induced diabetic rats. ACTA ACUST UNITED AC 2013. [DOI: 10.1007/s00580-013-1688-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kaithwas G, Majumdar DK. In vitro antioxidant and in vivo antidiabetic, antihyperlipidemic activity of linseed oil against streptozotocin-induced toxicity in albino rats. EUR J LIPID SCI TECH 2012. [DOI: 10.1002/ejlt.201100263] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Szkudelski T. Streptozotocin-nicotinamide-induced diabetes in the rat. Characteristics of the experimental model. Exp Biol Med (Maywood) 2012; 237:481-90. [PMID: 22619373 DOI: 10.1258/ebm.2012.011372] [Citation(s) in RCA: 215] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Administration of both streptozotocin (STZ) and nicotinamide (NA) has been proposed to induce experimental diabetes in the rat. STZ is well known to cause pancreatic B-cell damage, whereas NA is administered to rats to partially protect insulin-secreting cells against STZ. STZ is transported into B-cells via the glucose transporter GLUT2 and causes DNA damage leading to increased activity of poly(ADP-ribose) polymerase (PARP-1) to repair DNA. However, exaggerated activity of this enzyme results in depletion of intracellular NAD(+) and ATP, and the insulin-secreting cells undergo necrosis. The protective action of NA is due to the inhibition of PARP-1 activity. NA inhibits this enzyme, preventing depletion of NAD(+) and ATP in cells exposed to STZ. Moreover, NA serves as a precursor of NAD(+) and thereby additionally increases intracellular NAD(+) levels. The severity of diabetes in experimental rats strongly depends on the doses of STZ and NA given to these animals. Therefore, in diabetic rats, blood glucose may be changed in a broad range--from slight hyperglycemia to substantial hyperglycemia compared with control animals. Similarly, blood insulin may be only slightly decreased or substantial hypoinsulinemia may be induced. In vitro studies demonstrated that the insulin-secretory response to glucose is attenuated in STZ-NA-induced diabetic rats compared with control animals. This is due to reduced B-cell mass as well as metabolic defects in the insulin-secreting cells. Results of numerous experiments have demonstrated that this model of diabetes is useful in studies of different aspects of diabetes.
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Affiliation(s)
- Tomasz Szkudelski
- Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Wolynska 35, 60-637 Poznan, Poland.
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Abstract
Pancreatic cells contain specialised stores for ATP. Purinergic receptors (P2 and P1) and ecto-nucleotidases are expressed in both endocrine and exocrine calls, as well as in stromal cells. The pancreas, especially the endocrine cells, were an early target for the actions of ATP. After the historical perspective of purinergic signalling in the pancreas, the focus of this review will be the physiological functions of purinergic signalling in the regulation of both endocrine and exocrine pancreas. Next, we will consider possible interaction between purinergic signalling and other regulatory systems and their relation to nutrient homeostasis and cell survival. The pancreas is an organ exhibiting several serious diseases - cystic fibrosis, pancreatitis, pancreatic cancer and diabetes - and some are associated with changes in life-style and are increasing in incidence. There is upcoming evidence for the role of purinergic signalling in the pathophysiology of the pancreas, and the new challenge is to understand how it is integrated with other pathological processes.
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Affiliation(s)
- G Burnstock
- University College Medical School, Autonomic Neuroscience Centre, Rowland Hill Street, London NW3 2PF, UK.
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Li Y, Zhang W, Li P, Huang K. Effect of streptozocin-induced diabetes mellitus on expression of methionine sulfoxide reductases and accumulation of their substrates in mouse lenses. Exp Eye Res 2011; 92:401-7. [DOI: 10.1016/j.exer.2011.02.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2010] [Revised: 02/13/2011] [Accepted: 02/18/2011] [Indexed: 11/17/2022]
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31
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Different effects of islet transplantation and Detemir treatment on the reversal of streptozotocin-induced diabetes associated with β-cell regeneration. Diabetol Int 2010. [DOI: 10.1007/s13340-010-0005-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
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Shi YC, Pan TM. Antioxidant and pancreas-protective effect of red mold fermented products on streptozotocin-induced diabetic rats. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2010; 90:2519-2525. [PMID: 20737515 DOI: 10.1002/jsfa.4115] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
BACKGROUND Red mold fermented products contain various antioxidants, and were mentioned in an ancient Chinese pharmacopoeia of medicinal food and herbs. They were considered useful for the treatment of diabetes. The objective of this study was to determine the antioxidant and pancreas-protective function of red mold fermented products on streptozotocin (STZ)-induced diabetic rats. RESULTS Throughout the experimental period (8 weeks), significantly (P < 0.05) lowered plasma glucose, amylase, triglyceride and cholesterol levels were observed in groups treated with red mold fermented products. Diabetic rats showed higher reactive oxygen species (P < 0.05) and lower activities of glutathione disulfide reductase, glutathione reductase and catalase (P < 0.05) in pancreas as compared to normal rats and those treated with red mold fermented products. There were some necrotic cells observed in the pancreas of diabetic rats and pancreatic tissue damaged by STZ in the red mold fermented products supplemented groups was ameliorated. CONCLUSION These results indicate that red mold fermented products not only regulate hyperglycemia but also provide prevention against the effects of STZ-induced pancreatic damage.
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Affiliation(s)
- Yeu-Ching Shi
- Institute of Microbiology and Biochemistry, National Taiwan University, Taipei, Taiwan, ROC
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Fu YY, Kang KJ, Ahn JM, Kim HR, Na KY, Chae DW, Kim S, Chin HJ. Hyperbilirubinemia Reduces the Streptozotocin-Induced Pancreatic Damage through Attenuating the Oxidative Stress in the Gunn Rat. TOHOKU J EXP MED 2010; 222:265-73. [DOI: 10.1620/tjem.222.265] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Yan Yan Fu
- Department of Internal Medicine, Seoul National University College of Medicine
- Department of Internal Medicine, Seoul National University Bundang Hospital
| | - Kyung Ja Kang
- Department of Internal Medicine, Seoul National University Bundang Hospital
| | - Jung Myung Ahn
- Department of Internal Medicine, Seoul National University College of Medicine
| | - Hae-Ryoung Kim
- Department of Pathology, Seoul National University College of Medicine
| | - Ki Young Na
- Department of Internal Medicine, Seoul National University College of Medicine
- Department of Internal Medicine, Seoul National University Bundang Hospital
| | - Dong-Wan Chae
- Department of Internal Medicine, Seoul National University College of Medicine
- Department of Internal Medicine, Seoul National University Bundang Hospital
- Renal Institute, Clinical Research Center, Seoul National University Hospital
| | - Suhnggwon Kim
- Department of Internal Medicine, Seoul National University College of Medicine
- Department of Internal Medicine, Seoul National University Bundang Hospital
- Renal Institute, Clinical Research Center, Seoul National University Hospital
- Department of Immunology, Seoul National University Postgraduate School
| | - Ho Jun Chin
- Department of Internal Medicine, Seoul National University College of Medicine
- Department of Internal Medicine, Seoul National University Bundang Hospital
- Renal Institute, Clinical Research Center, Seoul National University Hospital
- Department of Immunology, Seoul National University Postgraduate School
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34
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Montanucci P, Basta G, Calafiore R. In Vitro–Cultured Human Islet Cell Monolayers: Stemness Markers and Insulin Recovery upon Streptozotocin Exposure. Tissue Eng Part A 2009; 15:3931-42. [DOI: 10.1089/ten.tea.2009.0124] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Pia Montanucci
- Section of Internal Medicine and Endocrine and Metabolic Sciences (Di.M.I.), Department of Internal Medicine, University of Perugia, Perugia, Italy
| | - Giuseppe Basta
- Section of Internal Medicine and Endocrine and Metabolic Sciences (Di.M.I.), Department of Internal Medicine, University of Perugia, Perugia, Italy
| | - Riccardo Calafiore
- Section of Internal Medicine and Endocrine and Metabolic Sciences (Di.M.I.), Department of Internal Medicine, University of Perugia, Perugia, Italy
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35
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Administration of sesamol improved blood-brain barrier function in streptozotocin-induced diabetic rats. Exp Brain Res 2009; 197:23-34. [PMID: 19565232 DOI: 10.1007/s00221-009-1866-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2008] [Accepted: 05/15/2009] [Indexed: 12/28/2022]
Abstract
Uncontrolled or poorly controlled blood glucose during diabetes is an important factor in worsened vascular function. While evidence suggests that hyperglycemia-induced oxidative stress plays a prominent role in development of microangiopathy of the retina, kidney, and nerves, the role oxidative stress plays on blood-brain barrier (BBB) function and structure has lagged behind. In this study, a natural antioxidant, sesamol, was administered to streptozotocin (STZ)-induced diabetic rats to examine the role that oxidative stress plays on BBB structure and function. Experiments were conducted at 56 days after STZ injection. Male Sprague-Dawley rats randomly were divided into four treatment groups CON--control; STZ--STZ-induced diabetes; CON + S--control + sesamol; STZ + S--STZ-induced diabetes + sesamol. Functional and structural changes to the BBB were measured by in situ brain perfusion and western blot analysis of changes in tight junction protein expression. Oxidative stress markers were visualized by fluorescent confocal microscopy and assayed by spectrophotometric analysis. Results demonstrated that the increased BBB permeability observed in STZ-induced diabetic rats was attenuated in STZ + S rats to levels observed in CON. Sesamol treatment reduced the negative impact of STZ-induced diabetes on tight junction protein expression in isolated cerebral microvessels. Oxidative stress markers were elevated in STZ as compared to CON. STZ + S displayed an improved antioxidant capacity which led to a reduced expression of superoxide and peroxynitrite and reduced lipid peroxidation. In conclusion, this study showed that sesamol treatment enhanced antioxidant capacity of the diabetic brain and led to decreased perturbation of hyperglycemia-induced changes in BBB structure and function.
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36
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Zhou J, Zhou S, Tang J, Zhang K, Guang L, Huang Y, Xu Y, Ying Y, Zhang L, Li D. Protective effect of berberine on beta cells in streptozotocin- and high-carbohydrate/high-fat diet-induced diabetic rats. Eur J Pharmacol 2009; 606:262-8. [DOI: 10.1016/j.ejphar.2008.12.056] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2008] [Revised: 12/17/2008] [Accepted: 12/23/2008] [Indexed: 02/02/2023]
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37
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Pancreatic protective effects of sodium tungstate in streptozotocin-induced diabetic rats. Diabetes & Metabolic Syndrome: Clinical Research & Reviews 2008. [DOI: 10.1016/j.dsx.2008.04.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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38
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A quantitative study of sodium tungstate protective effect on pancreatic beta cells in streptozotocin-induced diabetic rats. Micron 2008; 39:1300-5. [PMID: 18400503 DOI: 10.1016/j.micron.2008.02.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2007] [Revised: 02/26/2008] [Accepted: 02/27/2008] [Indexed: 11/22/2022]
Abstract
Diabetes is a major public health problem. Development of new therapies that are able to improve glycemia management, cure diabetes, and can even protect from it, are of great interest. This study investigated the protective effect of sodium tungstate against STZ-induced beta-cell damages by means of stereological methods. Sixty rats were divided into six groups: control (C), tungstate-treated control (TC), STZ-induced diabetic (D), STZ-induced diabetic rats were treated by sodium tungstate from 1 week before STZ injection (TDB), food-restricted diabetic (FRD), and diabetic rats treated with sodium tungstate 1 week after STZ administration (TDA). Stereological estimation of pancreas volume, islets volume density, volume-weighted mean islets volume and mass of beta cells, islets, and pancreas and total number of islets were done. Islets volume density, volume-weighted mean islets volume, and mass of beta cells, islets, and pancreas of TDB group was significantly higher than D, FRD and TDA groups (P<0.001) and was comparable to controls (C and TC groups). Total number of islets, pancreas wet weight and volume did not show any significant changes between these groups (P>0.05). Results suggested that sodium tungstate preserves pancreatic beta cells from STZ-induced damages and diabetes induction in rats.
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39
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A model for diabetic nephropathy: Advantages of the inducible cAMP early repressor transgenic mouse over the streptozotocin-induced diabetic mouse. J Cell Physiol 2008; 215:383-91. [DOI: 10.1002/jcp.21316] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Yibchok-anun S, Adisakwattana S, Yao CY, Sangvanich P, Roengsumran S, Hsu WH. Slow acting protein extract from fruit pulp of Momordica charantia with insulin secretagogue and insulinomimetic activities. Biol Pharm Bull 2006; 29:1126-31. [PMID: 16755004 DOI: 10.1248/bpb.29.1126] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The protein from Thai bitter gourd (Momordica charantia) fruit pulp was extracted and studied for its hypoglycemic effect. Subcutaneous administration of the protein extract (5, 10 mg/kg) significantly and markedly decreased plasma glucose concentrations in both normal and streptozotocin-induced diabetic rats in a dose-dependent manner. The onset of the protein extract-induced antihyperglycemia/hypoglycemia was observed at 4 and 6 h in diabetic and normal rats, respectively. This protein extract also raised plasma insulin concentrations by 2 fold 4 h following subcutaneous administration. In perfused rat pancreas, the protein extract (10 microg/ml) increased insulin secretion, but not glucagon secretion. The increase in insulin secretion was apparent within 5 min of administration and was persistent during 30 min of administration. Furthermore, the protein extract enhanced glucose uptake into C2C12 myocytes and 3T3-L1 adipocytes. Time course experiments performed in rat adipocytes revealed that M. charantia protein extract significantly increased glucose uptake after 4 and 6 h of incubation. Thus, the M. charantia protein extract, a slow acting chemical, exerted both insulin secretagogue and insulinomimetic activities to lower blood glucose concentrations in vivo.
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Affiliation(s)
- Sirintorn Yibchok-anun
- Department of Pharmacology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand.
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41
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Toleman C, Paterson AJ, Shin R, Kudlow JE. Streptozotocin inhibits O-GlcNAcase via the production of a transition state analog. Biochem Biophys Res Commun 2005; 340:526-34. [PMID: 16376298 DOI: 10.1016/j.bbrc.2005.12.041] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2005] [Accepted: 12/06/2005] [Indexed: 11/26/2022]
Abstract
Streptozotocin (STZ) is a 2-deoxy-d-glucopyranose derivative of a class of drugs known as alkylnitrosoureas, and is an established diabetogenic agent whose cytotoxic affects on pancreatic beta-cells has been partially explained by the presence of its N-methyl-N-nitrosourea side chain, which has the ability to release nitric oxide as well as donate methyl groups to nucleotides in DNA. It has also been observed that STZ administration results in a rise in the level of O-GlcNAcylated proteins within beta-cells. Not coincidentally, STZ has also been shown to directly inhibit the O-GlcNAcase activity of the enzyme NCOAT in vitro, which is the only enzyme that possesses the ability to remove O-GlcNAc modifications on proteins in the nucleus and cytosol. Since O-GlcNAc modification plays a role on a number of proteins in a vast amount of cellular processes, this shift in whole-cell protein O-GlcNAcylation state affords another source of cell death. We set about to find the exact mechanism by which STZ inhibits O-GlcNAcase activity. Inhibition is achievable because the GlcNAc analog STZ targets the active site of the enzyme whereby it is catalyzed. During this process, the enzyme converts STZ to a compound that closely resembles the natural ligand transition state, but is distinctly more stable energetically. As a result, this analog is catalyzed to completion at a much slower rate, thereby out-competing GlcNAc substrate for the active site, and inhibiting the enzyme.
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Affiliation(s)
- Clifford Toleman
- Department of Cell Biology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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42
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Park C, Kim JR, Shim JK, Kang BS, Park YG, Nam KS, Lee YC, Kim CH. Inhibitory effects of streptozotocin, tumor necrosis factor-alpha, and interleukin-1beta on glucokinase activity in pancreatic islets and gene expression of GLUT2 and glucokinase. Arch Biochem Biophys 1999; 362:217-24. [PMID: 9989930 DOI: 10.1006/abbi.1998.1004] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Treatment of streptozotocin (ST), tumor necrosis factor-alpha (TNF-alpha), and interleukin-1beta (IL-1beta) resulted in destroying insulin-secreting beta-cells of pancreatic islets and impairment of islet glucose oxidation and glucose-induced insulin secretion. IL-1beta and TNF-alpha inhibited insulin release and glucose utilization and oxidation. It was shown that the inhibitory effects of ST, IL-1beta, and TNF-alpha were due to impaired glucokinase activity. Glucokinase activity was severely impaired by ST, IL-1beta, and TNF-alpha treatments, as confirmed by assaying enzymes and nucleotides associated with glycolysis and glucose oxidation. On the other hand, nitric oxide was a factor of the deleterious effects of IL-1beta, TNF-alpha, and ST on pancreatic islets. Incubation of mouse pancreatic islets with ST at various concentrations of impairing insulin secretion resulted in generation of nitrite, stimulation of islet guanylyl cyclase and accumulation of cGMP, and inhibition of pancreatic islet mitochondrial aconitase activity to degree similar to those raised by IL-1beta and TNF-alpha. When the effects of IL-1beta and TNF-alpha on the gene expression of pancreatic GLUT2 and glucokinase were examined, the level of GLUT2 and glucokinase mRNA in pancreatic islets was significantly decreased. This suggested that IL-1beta and TNF-alpha downregulate gene expression of GLUT2 and glucokinase in pancreatic beta-cells.
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Affiliation(s)
- C Park
- College of Oriental Medicine, College of Medicine, DongGuk University, Sukjang-Dong 707, Kyung-Ju City, Kyungpook, 780-714, Korea
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43
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Schroeder RE, Rajakumar PA, Devaskar SU. Effect of streptozotocin-induced maternal diabetes on fetal rat brain glucose transporters. Pediatr Res 1997; 41:346-52. [PMID: 9078533 DOI: 10.1203/00006450-199703000-00007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Glucose, an essential substrate for brain oxidative metabolism, is transported across the blood-brain barrier and into neuronal and glial cells via Glut 1 and Glut 3 facilitative glucose transporter isoforms. To examine the effect of excessive circulating glucose on fetal brain glucose transporter expression, we investigated the effect of streptozotocin-induced maternal diabetes (SEVERE-D; n = 29) on the 20-d gestation fetal rat brain Glut 1 and Glut 3. We studied the effect of streptozotocin alone (STZ-ND; n = 12) in a nondiabetic state as well, along with vehicle injected controls (C; n = 24). In the presence of fetal hyperglycemia (12.63 +/- 0.82 nM-SEVERE-D versus 2.35 +/- 0.28-STZ-ND and 2.42 +/- 0.16-C; p < 0.001) and hypoinsulinemia (0.38 +/- 0.03 nM-SEVERE-D versus 0.50 +/- 0.07-STZ-ND and 0.55 +/- 0.06-C; p < 0.02), no detectable change in fetal brain Glut 1 and Glut 3 pretranslational expression (transcription/elongation rates and corresponding steady state mRNA levels) was noted when simultaneously compared with the STZ-ND and C groups. In contrast, a trend toward a decline in Glut 1 (approximately 25 to 30%, p = 0.05) and a substantive decrease in Glut 3 (approximately 35 to 50%, p = 0.0006) protein concentrations was present in both the STZ-ND and SEVERE-D groups when compared with the C group. These observations support a chemical effect of streptozotocin independent of maternal diabetes upon the translation or posttranslational processing of fetal brain glucose transporters. Maternal diabetes with fetal hyperglycemia, however, failed to substantively alter fetal brain glucose transporters independent of the streptozotocin effects upon neuroectodermally derived tissues. We conclude that maternal diabetes with associated overt fetal hyperglycemia does not significantly change fetal brain glucose transporter levels.
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Affiliation(s)
- R E Schroeder
- Department of Pediatrics, St. Louis University School of Medicine, Missouri 63110, USA
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44
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Pieper GM, Felix CC, Kalyanaraman B, Turk M, Roza AM. Detection by ESR of DMPO hydroxyl adduct formation from islets of Langerhans. Free Radic Biol Med 1995; 19:219-25. [PMID: 7649493 DOI: 10.1016/0891-5849(95)00018-s] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Electron spin resonance (ESR) spectroscopy together with spin trapping techniques and the application of state-of-the-art loop gap resonators was used to provide a direct measure of spontaneous oxygen radical production by homogenates of freshly isolated and cultured rat pancreatic islets. Using the spin trap agent, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), we were able to detect production by islets of an ESR-sensitive radical signal consisting of a quartet with intensity ratio of 1:2:2:1 and hyperfine splitting of aN = aH = 14.9 Gauss, which is consistent with the DMPO-OH adduct. The amplitude of the signal was decreased by decreasing amount of islets and not detected in the absence of islets. Formation of the DMPO-OH adduct was diminished by the hydroxyl radical scavengers (e.g., ethanol, dimethylsulfoxide, and dimethylthiourea). Only partial attenuation of signal was produced by incubation with an iron chelator or using chelex-treated buffers. The ESR signal was insensitive to the xanthine oxidase inhibitor, oxypurinol, or to superoxide dismutase, but was eliminated in a concentration-dependent manner by either potassium cyanide or catalase (but not heat-inactivated catalase). These observations suggest that the origin of the DMPO-OH arose not from free hydroxyl radicals but primarily from endogenous hydrogen peroxide production perhaps of mitochondrial origin. The development of this technology has implications for the potential measure of oxygen radical production in islet homogenates under pathologic conditions as well as to the application of other cell culture systems.
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Affiliation(s)
- G M Pieper
- Department of Transplant Surgery, Medical College of Wisconsin, Milwaukee 53226, USA
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45
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Kume E, Ohmachi Y, Itagaki S, Tamura K, Doi K. Hepatic changes of mice in the subacute phase of streptozotocin (SZ)-induced diabetes. EXPERIMENTAL AND TOXICOLOGIC PATHOLOGY : OFFICIAL JOURNAL OF THE GESELLSCHAFT FUR TOXIKOLOGISCHE PATHOLOGIE 1994; 46:368-74. [PMID: 7894249 DOI: 10.1016/s0940-2993(11)80119-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Hepatic changes of mice in the subacute phase of streptozotocin (SZ)-induced diabetes were investigated biochemically and pathologically. Biochemically, the contents of serum glucose and of serum and liver lipids increased while the content of liver glycogen decreased in SZ-induced diabetic mice. Histopathologically, hypertrophy of hepatocytes due to an increase in number of intracytoplasmic acidophilic granules was common to SZ-induced diabetic mice. Electron microscopically, these hepatocytes were characterized by a prominent increase in number of mitochondria showing normal structure, a marked decrease of glycogen granules and poorly developed rough endoplasmic reticulum, which were common to so-called oncocytic cells. In some SZ-induced diabetic mice, bile duct hyperplasia with an appearance of cytomegalic hepatocytes was also observed.
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Affiliation(s)
- E Kume
- Research Laboratory of Drug Metabolism, Tanabe Seiyaku Co. Ltd., Saitama, Japan
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46
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Erecińska M, Bryła J, Michalik M, Meglasson MD, Nelson D. Energy metabolism in islets of Langerhans. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1101:273-95. [PMID: 1643073 DOI: 10.1016/0005-2728(92)90084-f] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- M Erecińska
- Department of Pharmacology, University of Pennsylvania, School of Medicine, Philadelphia 19104-6084
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