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Preisser TM, da Cunha VP, Santana MP, Pereira VB, Cara DC, Souza BM, Miyoshi A. Recombinant Lactococcus lactis Carrying IL-4 and IL-10 Coding Vectors Protects against Type 1 Diabetes in NOD Mice and Attenuates Insulitis in the STZ-Induced Model. J Diabetes Res 2021; 2021:6697319. [PMID: 33604389 PMCID: PMC7872750 DOI: 10.1155/2021/6697319] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/21/2021] [Accepted: 01/23/2021] [Indexed: 01/01/2023] Open
Abstract
Type 1 diabetes (T1D) is an autoimmune disease that culminates in beta cell destruction in the pancreas and, subsequently, deficiency in insulin production. Cytokines play a crucial role in the development of diabetes, orchestrating the recruitment and action of immune cells, to not only destroy insulin-producing cells but also preserve them. Therefore, the aim of this study was to investigate the effect of orally administered Lactococcus lactis MG1363 FnBPA+ strains carrying plasmids encoding IL-4 and IL-10 in the streptozotocin- (STZ-) induced diabetes model and in nonobese diabetic (NOD) mice. The STZ-induced mice that were treated with combined bacterial strains carrying plasmids encoding IL-4 and IL-10 showed lower incidence of diabetes and more preserved pancreatic islets than the mice that received the individual bacterial strains. Combined administration of L. lactis MG1363 FnBPA+ (pValac::dts::IL-4) and L. lactis MG1363 FnBPA+ (pValac::IL-10) resulted in protection against diabetes in NOD mice. It was shown that the combined treatment with recombinant bacterial by oral route prevented hyperglycemia and reduced the pancreatic islets-destruction in NOD mice. In addition, increased levels of IL-4 and IL-10 in serum and pancreatic tissue revealed a systemic effect of the treatment and also favored an anti-inflammatory microenvironment. Reduced concentrations of IL-12 in pancreas were essential to the regulation of inflammation, resulting in no incidence of diabetes in treated NOD mice. Normal levels of intestinal sIgA after long-term treatment with the L. lactis strains carrying plasmids encoding IL-4 and IL-10 indicate the development of oral tolerance and corroborate the use of this potent tool of mucosal delivery. For the first time, L. lactis MG1363 FnBPA+ strains carrying eukaryotic expression vectors encoding IL-4 and IL-10 are tested in STZ-induced and NOD mouse models. Therefore, our study demonstrates this innovative strategy provides immunomodulatory potential for further investigations in T1D and other autoimmune diseases.
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MESH Headings
- Animals
- Blood Glucose/metabolism
- Colon/immunology
- Colon/metabolism
- Diabetes Mellitus, Experimental/genetics
- Diabetes Mellitus, Experimental/immunology
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/prevention & control
- Diabetes Mellitus, Type 1/genetics
- Diabetes Mellitus, Type 1/immunology
- Diabetes Mellitus, Type 1/metabolism
- Diabetes Mellitus, Type 1/prevention & control
- Female
- Genetic Therapy
- Genetic Vectors
- Immunoglobulin A, Secretory/metabolism
- Insulin/blood
- Interleukin-10/biosynthesis
- Interleukin-10/blood
- Interleukin-10/genetics
- Interleukin-4/biosynthesis
- Interleukin-4/blood
- Interleukin-4/genetics
- Islets of Langerhans/immunology
- Islets of Langerhans/metabolism
- Islets of Langerhans/pathology
- Lactococcus lactis/genetics
- Lactococcus lactis/metabolism
- Male
- Mice, Inbred C57BL
- Mice, Inbred NOD
- Mice
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Affiliation(s)
- Tatiane M. Preisser
- Laboratory of Genetic Technology, Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais ZIP/Post Code: 31270-901, Brazil
| | - Vanessa P. da Cunha
- Laboratory of Genetic Technology, Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais ZIP/Post Code: 31270-901, Brazil
| | - Mariana P. Santana
- Laboratory of Genetic Technology, Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais ZIP/Post Code: 31270-901, Brazil
| | - Vanessa B. Pereira
- Laboratory of Genetic Technology, Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais ZIP/Post Code: 31270-901, Brazil
| | - Denise C. Cara
- Center for Gastrointestinal Biology, Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais ZIP/Post Code: 31270-901, Brazil
| | - Bianca M. Souza
- Laboratory of Genetic Technology, Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais ZIP/Post Code: 31270-901, Brazil
| | - Anderson Miyoshi
- Laboratory of Genetic Technology, Department of Genetics, Ecology and Evolution, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais ZIP/Post Code: 31270-901, Brazil
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Amirshahrokhi K, Zohouri A. Carvedilol prevents pancreatic β-cell damage and the development of type 1 diabetes in mice by the inhibition of proinflammatory cytokines, NF-κB, COX-2, iNOS and oxidative stress. Cytokine 2020; 138:155394. [PMID: 33310423 DOI: 10.1016/j.cyto.2020.155394] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 11/29/2020] [Accepted: 11/30/2020] [Indexed: 01/06/2023]
Abstract
Inflammation is one of the main mechanisms of pancreatic β-cell damage and the development of type 1 diabetes (T1D). Carvedilol, a beta-adrenergic receptor blocker, has been demonstrated to have anti-inflammatory and antioxidant effects. The aim of this study was to investigate the protective effect of carvedilol against pancreatic β-cell damage and the development of T1D in an experimental model. T1D was induced in mice by multiple low-dose streptozotocin (STZ) injections. Diabetic mice were treated with carvedilol (15 and 20 mg/kg/day, orally) for 14 days. Results showed that blood glucose levels, diabetes incidence, body weight loss and insulitis in the pancreatic tissue were significantly reduced in mice treated with carvedilol. Treatment of mice with carvedilol significantly increased the levels of antioxidants glutathione (GSH), superoxide dismutase (SOD), and catalase and decreased the levels of malondialdehyde (MDA), nitric oxide (NO) and myeloperoxidase (MPO) in the pancreatic tissue as compared with those in the STZ-induced diabetic mice. Carvedilol decreased the expression of nuclear factor kappa B (NF-κB), cyclooxygenase-2 (COX-2) and inducible nitric oxide synthase (iNOS) as important modulators of inflammation and β-cell damage in the pancreatic tissue. In addition, carvedilol significantly reduced the levels of proinflammatory cytokines tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6 IL-12, IL-17, interferon (IFN)-γ and chemokine MCP-1, while increased the anti-inflammatory cytokine IL-10 in the pancreatic tissue. In conclusion, these findings suggest that carvedilol is able to prevent pancreatic β-cell damage and the development of T1D in mice by the inhibition of inflammatory and oxidative mediators.
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Affiliation(s)
- Keyvan Amirshahrokhi
- Department of Pharmacology, School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran.
| | - Ali Zohouri
- Division of Pathology, Fatemi Hospital, Ardabil University of Medical Sciences, Ardabil, Iran
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Yang QH, Zhang Y, Jiang J, Wu MM, Han Q, Bo QY, Yu GW, Ru YS, Liu X, Huang M, Wang L, Zhang XM, Fang JM, Li XR. Protective effects of a novel drug RC28-E blocking both VEGF and FGF2 on early diabetic rat retina. Int J Ophthalmol 2018; 11:935-944. [PMID: 29977804 DOI: 10.18240/ijo.2018.06.07] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 04/24/2018] [Indexed: 11/23/2022] Open
Abstract
AIM To investigate protective effects of a novel recombinant decoy receptor drug RC28-E on retinal damage in early diabetic rats. METHODS The streptozotocin (STZ)-induced diabetic rats were randomly divided into 6 groups: diabetes mellitus (DM) group (saline, 3 µL/eye); RC28-E at low (0.33 µg/µL, 3 µL), medium (1 µg/µL, 3 µL), and high (3 µg/µL, 3 µL) dose groups; vascular endothelial growth factor (VEGF) Trap group (1 µg/µL, 3 µL); fibroblast growth factor (FGF) Trap group (1 µg/µL, 3 µL). Normal control group was included. At week 1 and 4 following diabetic induction, the rats were intravitreally injected with the corresponding solutions. At week 6 following the induction, apoptosis in retinal vessels was detected by TUNEL staining. Glial fibrillary acidic protein (GFAP) expression was examined by immunofluorescence. Blood-retinal barrier (BRB) breakdown was assessed by Evans blue assay. Ultrastructural changes in choroidal and retinal vessels were analyzed by transmission electron microscopy (TEM). Content of VEGF and FGF proteins in retina was measured by enzyme linked immunosorbent assay (ELISA). The retinal expression of intercellular cell adhesion molecule-1 (ICAM-1), tumor necrosis factor-α (TNF-α), VEGF and FGF genes was examined by quantitative polymerase chain reaction (qPCR). RESULTS TUNEL staining showed that the aberrantly increased apoptotic cells death in diabetic retinal vascular network was significantly reduced by treatments of medium and high dose RC28-E, VEGF Trap, and FGF Trap (all P<0.05), the effects of medium and high dose RC28-E or FGF Trap were greater than VEGF Trap (P<0.01). GFAP staining suggested that reactive gliosis was substantially inhibited in all RC28-E and VEGF Trap groups, but the inhibition in FGF Trap group was not as prominent. Evans blue assay demonstrated that only high dose RC28-E could significantly reduce vascular leakage in early diabetic retina (P<0.01). TEM revealed that the ultrastructures in choroidal and retinal vessels were damaged in early diabetic retina, which was ameliorated to differential extents by each drug. The expression of VEGF and FGF2 proteins was significantly upregulated in early diabetic retina, and normalized by RC28-E at all dosages and by the corresponding Traps. The upregulation of ICAM-1 and TNF-α in diabetic retina was substantially suppressed by RC28-E and positive control drugs. CONCLUSION Dual blockade of VEGF and FGF2 by RC28-E generates remarkable protective effects, including anti-apoptosis, anti-gliosis, anti-leakage, and improving ultrastructures and proinflammatory microenvironment, in early diabetic retina, thereby supporting further development of RC28-E into a novel and effective drug to diabetic retinopathy (DR).
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Affiliation(s)
- Qian-Hui Yang
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Yan Zhang
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Jing Jiang
- School of Pharmacy, Binzhou Medical University, Yantai 264003, Shandong Province, China
| | - Mian-Mian Wu
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Qian Han
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Qi-Yu Bo
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Guang-Wei Yu
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Yu-Sha Ru
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Xun Liu
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Min Huang
- Remegen, Ltd., Yantai 264006, Shandong Province, China
| | - Ling Wang
- Remegen, Ltd., Yantai 264006, Shandong Province, China
| | - Xiao-Min Zhang
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
| | - Jian-Min Fang
- School of Life Sciences and Technology, Tongji University, Shanghai 200092, China
| | - Xiao-Rong Li
- Tianjin Medical University Eye Hospital, Tianjin Medical University Eye Institute, College of Optometry and Ophthalmology, Tianjin Medical University, Tianjin 300384, China
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Bâlici Ş, Wankeu-Nya M, Rusu D, Nicula GZ, Rusu M, Florea A, Matei H. Ultrastructural Analysis of In Vivo Hypoglycemiant Effect of Two Polyoxometalates in Rats with Streptozotocin-Induced Diabetes. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2015; 21:1236-1248. [PMID: 26343528 DOI: 10.1017/s1431927615015020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Two polyoxometalates (POMs), synthesized through a self-assembling method, were used in the treatment of streptozotocin (STZ)-induced diabetic rats. One of these nanocompounds [tris(vanadyl)-substituted tungsto-antimonate(III)-anions—POM1] was previously described in the literature, whereas the second [tris-butyltin-21-tungsto-9-antimonate(III)-anions—POM2], was prepared by us based on our original formula. In rats with STZ-induced diabetes treated with POMs (up to a cumulative dose of 4 mg/kg bodyweight at the end of the treatments), statistically significant reduced levels of blood glucose were measured after 3 weeks, as compared with the diabetic control groups (DCGs). Ultrastructural analysis of pancreatic β-cells (including the mean diameter of secretory vesicles and of their insulin granules) in the treated diabetic rats proved the POMs contribute to limitation of cellular degeneration triggered by STZ, as well as to the presence of increased amounts of insulin-containing vesicles as compared with the DCG. The two POMs also showed hepatoprotective properties when ultrastructural aspects of hepatocytes in the experimental groups of rats were studied. Based on our in vivo studies, we concluded that the two POMs tested achieved hypoglycemiant effects by preventing STZ-triggered apoptosis of pancreatic β-cells and stimulation of insulin synthesis.
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Affiliation(s)
- Ştefana Bâlici
- 1Department of Cell and Molecular Biology, Faculty of Medicine,"Iuliu Haţieganu" University of Medicine and Pharmacy,6 Louis Pasteur St.,400349 Cluj-Napoca,România
| | - Modeste Wankeu-Nya
- 1Department of Cell and Molecular Biology, Faculty of Medicine,"Iuliu Haţieganu" University of Medicine and Pharmacy,6 Louis Pasteur St.,400349 Cluj-Napoca,România
| | - Dan Rusu
- 4Department of Physical-Chemistry, Faculty of Pharmacy,"Iuliu Haţieganu" University of Medicine and Pharmacy,6 Louis Pasteur St.,400349 Cluj-Napoca,România
| | - Gheorghe Z Nicula
- 1Department of Cell and Molecular Biology, Faculty of Medicine,"Iuliu Haţieganu" University of Medicine and Pharmacy,6 Louis Pasteur St.,400349 Cluj-Napoca,România
| | - Mariana Rusu
- 2Department of Inorganic Chemistry, Faculty of Chemistry and Chemical Engineering,"Babeş-Bolyai" University,11 Arany Janos St.,400028 Cluj-Napoca,România
| | - Adrian Florea
- 1Department of Cell and Molecular Biology, Faculty of Medicine,"Iuliu Haţieganu" University of Medicine and Pharmacy,6 Louis Pasteur St.,400349 Cluj-Napoca,România
| | - Horea Matei
- 1Department of Cell and Molecular Biology, Faculty of Medicine,"Iuliu Haţieganu" University of Medicine and Pharmacy,6 Louis Pasteur St.,400349 Cluj-Napoca,România
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Lee YJ, Song DS, Yoo JS, Hyung KE, Lee MJ, Moon YH, Lee IH, Go BS, Park SY, Hwang KW. Protective functions of peroxiredoxin-1 against cytokine-induced MIN6 pancreatic β-cell line death. Can J Physiol Pharmacol 2013; 91:1037-43. [DOI: 10.1139/cjpp-2013-0098] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Pancreatic β-cells play a crucial role in glucose homeostasis, and the failure of these cells to function results in the development of type 1 diabetes (T1D). The MIN6 cell line, which closely resembles pancreatic β-cells, was used to unravel the relationship between pancreatic β-cell function and the antioxidant enzyme PRX-1. PRX-1 was knocked down in MIN6 cells using a shPRX-1 lentiviral construct, and a mixture of inflammatory cytokines was administered to challenge the MIN6 cells. Nitric oxide (NO) production and inducible NO synthase (iNOS) expression were elevated in shPRX-1 compared with the control. Also, shPRX-1 transduced cells showed higher levels of NF-κB nuclear translocation, suggesting that PRX-1 has a regulatory role in NF-κB nuclear translocation and iNOS expression. In correlation with NO levels, decreased anti-apoptotic gene Bcl-xl level and elevated pro-apoptotic gene Bim levels were observed in shPRX-1 cells compared with scramble, and cell viability decreased accordingly. A rescue experiment was performed subsequently using an iNOS inhibitor to confirm NO as the cause of cell death. Overall, the results of this study suggest possible protective roles of the antioxidant enzyme PRX-1 in the insulinoma cell line MIN6 and possibly in pancreatic β-cells under T1D conditions.
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Affiliation(s)
- Yun-Jung Lee
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
| | - Dong Sup Song
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
| | - Jong-Sun Yoo
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
| | - Kyeong Eun Hyung
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
| | - Mi Ji Lee
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
| | - Young-hye Moon
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
| | - Ik Hee Lee
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
| | - Byung Sung Go
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
| | - So-Young Park
- Pharmacognosy Laboratory, College of Pharmacy, Dankook University, San#29, Anseo-dong, Dongnam-gu, Cheonan-si, Chungnam 330-714, Republic of Korea
| | - Kwang Woo Hwang
- Laboratory of Host Defense Modulation, College of Pharmacy, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea
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Heligmosomoides polygyrus infection reduces severity of type 1 diabetes induced by multiple low-dose streptozotocin in mice via STAT6- and IL-10-independent mechanisms. Exp Parasitol 2013; 135:388-96. [DOI: 10.1016/j.exppara.2013.08.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 08/01/2013] [Accepted: 08/09/2013] [Indexed: 12/11/2022]
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Thalidomide attenuates multiple low-dose streptozotocin-induced diabetes in mice by inhibition of proinflammatory cytokines. Cytokine 2012; 60:522-7. [DOI: 10.1016/j.cyto.2012.07.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 07/25/2012] [Accepted: 07/26/2012] [Indexed: 01/03/2023]
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Rezende LF, Santos GJ, Carneiro EM, Boschero AC. Ciliary neurotrophic factor protects mice against streptozotocin-induced type 1 diabetes through SOCS3: the role of STAT1/STAT3 ratio in β-cell death. J Biol Chem 2012; 287:41628-39. [PMID: 23038263 DOI: 10.1074/jbc.m112.358788] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Type 1 diabetes is characterized by a loss of islet β-cells. Ciliary neurotrophic factor (CNTF) protects pancreatic islets against cytokine-induced apoptosis. For this reason, we assessed whether CNTF protects mice against streptozotocin-induced diabetes (a model of type 1 diabetes) and the mechanism for this protection. WT and SOCS3 knockdown C57BL6 mice were treated for 5 days with citrate buffer or 0.1 mg/kg CNTF before receiving 80 mg/kg streptozotocin. Glycemia in non-fasted mice was measured weekly from days 0-28 after streptozotocin administration. Diabetes was defined as a blood glucose > 11.2 mmol/liter. Wild-type (WT) and SOCS3 knockdown MIN6 cells were cultured with CNTF, IL1β, or both. CNTF reduced diabetes incidence and islet apoptosis in WT but not in SOCS3kd mice. Likewise, CNTF inhibited apoptosis in WT but not in SOCS3kd MIN6 cells. CNTF increased STAT3 phosphorylation in WT and SOCS3kd mice and MIN6 cells but reduced STAT1 phosphorylation only in WT mice, in contrast to streptozotocin and IL1β. Moreover, CNTF reduced NFκB activation and required down-regulation of inducible NO synthase expression to exert its protective effects. In conclusion, CNTF protects mice against streptozotocin-induced diabetes by increasing pancreatic islet survival, and this protection depends on SOCS3. In addition, SOCS3 expression and β-cell fate are dependent on STAT1/STAT3 ratio.
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Affiliation(s)
- Luiz F Rezende
- Department of Structural and Functional Biology Institute of Biology State University of Campinas (UNICAMP), P.O. Box 6109, Campinas, Sao Paulo 13083-865, Brazil.
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Tanioka T, Tamura Y, Fukaya M, Shinozaki S, Mao J, Kim M, Shimizu N, Kitamura T, Kaneki M. Inducible nitric-oxide synthase and nitric oxide donor decrease insulin receptor substrate-2 protein expression by promoting proteasome-dependent degradation in pancreatic beta-cells: involvement of glycogen synthase kinase-3beta. J Biol Chem 2011; 286:29388-29396. [PMID: 21700708 DOI: 10.1074/jbc.m110.192732] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Insulin receptor substrate-2 (IRS-2) plays a critical role in the survival and function of pancreatic β-cells. Gene disruption of IRS-2 results in failure of the β-cell compensatory mechanism and diabetes. Nonetheless, the regulation of IRS-2 protein expression in β-cells remains largely unknown. Inducible nitric-oxide synthase (iNOS), a major mediator of inflammation, has been implicated in β-cell damage in type 1 and type 2 diabetes. The effects of iNOS on IRS-2 expression have not yet been investigated in β-cells. Here, we show that iNOS and NO donor decreased IRS-2 protein expression in INS-1/832 insulinoma cells and mouse islets, whereas IRS-2 mRNA levels were not altered. Interleukin-1β (IL-1β), alone or in combination with interferon-γ (IFN-γ), reduced IRS-2 protein expression in an iNOS-dependent manner without altering IRS-2 mRNA levels. Proteasome inhibitors, MG132 and lactacystin, blocked the NO donor-induced reduction in IRS-2 protein expression. Treatment with NO donor led to activation of glycogen synthase kinase-3β (GSK-3β) and c-Jun N-terminal kinase (JNK/SAPK) in β-cells. Inhibition of GSK-3β by pharmacological inhibitors or siRNA-mediated knockdown significantly prevented NO donor-induced reduction in IRS-2 expression in β-cells. In contrast, a JNK inhibitor, SP600125, did not effectively block reduced IRS-2 expression in NO donor-treated β-cells. These data indicate that iNOS-derived NO reduces IRS-2 expression by promoting protein degradation, at least in part, through a GSK-3β-dependent mechanism. Our findings suggest that iNOS-mediated decreased IRS-2 expression may contribute to the progression and/or exacerbation of β-cell failure in diabetes.
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Affiliation(s)
- Toshihiro Tanioka
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts 02129 and
| | - Yoshiaki Tamura
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts 02129 and
| | - Makiko Fukaya
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts 02129 and
| | - Shohei Shinozaki
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts 02129 and
| | - Ji Mao
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts 02129 and
| | - Minhye Kim
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts 02129 and
| | - Nobuyuki Shimizu
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts 02129 and
| | - Tadahiro Kitamura
- Metabolic Signal Research Center, Institute for Molecular and Cellular Regulation, Gunma University, Gunma 371-8512, Japan
| | - Masao Kaneki
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Shriners Hospitals for Children, Harvard Medical School, Charlestown, Massachusetts 02129 and.
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Acceleration of autoimmune diabetes in Rheb-congenic NOD mice with β-cell-specific mTORC1 activation. Biochem Biophys Res Commun 2011; 408:306-11. [PMID: 21513702 DOI: 10.1016/j.bbrc.2011.04.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Accepted: 04/06/2011] [Indexed: 11/23/2022]
Abstract
The protein Ras homolog enriched in brain (Rheb) is a Ras-like small GTPase that activates the mechanistic target of rapamycin complex 1 (mTORC1), which promotes cell growth. We previously generated transgenic C57BL/6 mice overexpressing Rheb in β-cells (B6(Rheb)), which exhibited increased β-cell size and improved glucose tolerance with higher insulin secretion than wild type C57BL/6 mice. The mice also showed resistance to obesity-induced hyperglycemia, a model of type 2 diabetes, and to multiple low-dose-streptozotocin (MLDS)-induced hyperglycemia, a model of type 1 diabetes (T1D). To investigate whether the effects of mTORC1 activation by Rheb in B6(Rheb) mice would also be evident in NOD mice, a spontaneous autoimmune T1D model, we created two NOD mouse lines overexpressing Rheb in their β-cells (NOD(Rheb); R3 and R20). We verified Rheb overexpression in β-cells, the relative activation of mTORC1 and β-cell enlargement. By 35 weeks of age, diabetes incidence was significantly greater in the R3 line and tended to be greater in the R20 line than in NOD mice. Histological analysis demonstrated that insulitis was significantly accelerated in 12-week-old R3 NOD(Rheb) mice compared with NOD mice. Furthermore, serum insulin autoantibody (IAA) expression was significantly higher than that of NOD mice. We also examined whether complete Freund's adjuvant (CFA) treatment alone or with glucagon-like peptide-1 (GLP-1) analog would reverse the hyperglycemia of NOD(Rheb) mice; unexpectedly, almost none achieved normoglycemia. In summary, diabetes progression was significantly accelerated rather than prevented in NOD(Rheb) mice. Our results suggest that the β-cell enlargement might merely enhance the autoimmunity of pathogenic T-cells against islets, leading to acceleration of autoimmune diabetes. We conclude that not only enlargement but also regeneration of β-cells in addition to the prevention of β-cell destruction will be required for the ideal therapy of autoimmune T1D.
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Chromatin remodeling resets the immune system to protect against autoimmune diabetes in mice. Immunol Cell Biol 2011; 89:640-9. [DOI: 10.1038/icb.2010.144] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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