Insulin secretion defects of human type 2 diabetic islets are corrected in vitro by a new reactive oxygen species scavenger

Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2 diabetic and non-diabetic subjects, matched for age and body mass index. Evidence of increased oxidative stress in diabetic islets was demonstrated by meas...

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Published inDiabetes & metabolism Vol. 33; no. 5; pp. 340 - 345
Main Authors Lupi, R., Del Guerra, S., Mancarella, R., Novelli, M., Valgimigli, L., Pedulli, G.F., Paolini, M., Soleti, A., Filipponi, F., Mosca, F., Boggi, U., Del Prato, S., Masiello, P., Marchetti, P.
Format Journal Article
LanguageEnglish
Published France Elsevier Masson SAS 01.11.2007
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Online AccessGet full text
ISSN1262-3636
1878-1780
DOI10.1016/j.diabet.2007.03.005

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Abstract Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2 diabetic and non-diabetic subjects, matched for age and body mass index. Evidence of increased oxidative stress in diabetic islets was demonstrated by measuring nitrotyrosine concentration and by electron paramagnetic resonance. This was accompanied by reduced glucose-stimulated insulin secretion, as compared to non-diabetic islets (Stimulation Index, SI: 0.9 ± 0.2 vs. 2.0±0.4, P < 0.01), and by altered expression of insulin (approximately –60%), catalase (approximately +90%) and glutathione peroxidase (approximately +140%). When type 2 diabetic islets were pre-exposed for 24 h to the new antioxidant bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl)decandioate di-hydrochloride, nitrotyrosine levels, glucose-stimulated insulin secretion (SI: 1.6 ± 0.5) and gene expressions improved/normalized. These results support the concept that oxidative stress may play a role in type 2 diabetes beta-cell dysfunction; furthermore, it is proposed that therapy with antioxidants could be an interesting adjunctive pharmacological approach to the treatment of type 2 diabetes. Le stress oxydant est considéré un mécanisme important à l'origine des lésions des cellules β dans le diabète type 2. Dans des îlots humains isolés à partir de sujets diabétiques type 2 et non diabétiques, comparables par âge et le BMI, l'augmentation du stress oxydatif a été mise en évidence par l'évaluation des concentrations de nitrotyrosine et par résonance paramagnétique électronique. Par ailleurs, chez les îlots diabétiques, a été mise en évidence une réduction de la sécrétion d'insuline induite par le glucose par comparaison aux îlots témoins, avec en outre, une expression anormale de l'insuline (~ –60 %), de la catalase (~ +90 %) et du glutathion peroxydase (~ 140 %). Après préincubation durant 24 heures des îlots diabétiques en présence d'un nouvel antioxydant, le bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl) decandioate dichlorure, les concentrations de nitrotyrosine et la sécrétion d'insuline induite par le glucose, ainsi que l'expression des gènes mentionnés, se sont améliorés ou normalisés. Ces résultats confirment que le stress oxydant est impliqué dans les altérations des cellules β au cours du diabète type 2 et suggèrent qu'une thérapie antioxydante pourrait constituer une approche complémentaire très intéressante pour le traitement du diabète de type 2.
AbstractList Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2 diabetic and non-diabetic subjects, matched for age and body mass index. Evidence of increased oxidative stress in diabetic islets was demonstrated by measuring nitrotyrosine concentration and by electron paramagnetic resonance. This was accompanied by reduced glucose-stimulated insulin secretion, as compared to non-diabetic islets (Stimulation Index, SI: 0.9 +/- 0.2 vs. 2.0 +/- 0.4, P<0.01), and by altered expression of insulin (approximately -60%), catalase (approximately +90%) and glutathione peroxidase (approximately +140%). When type 2 diabetic islets were pre-exposed for 24 h to the new antioxidant bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl)decandioate di-hydrochloride, nitrotyrosine levels, glucose-stimulated insulin secretion (SI: 1.6+/-0.5) and gene expressions improved/normalized. These results support the concept that oxidative stress may play a role in type 2 diabetes beta-cell dysfunction; furthermore, it is proposed that therapy with antioxidants could be an interesting adjunctive pharmacological approach to the treatment of type 2 diabetes.Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2 diabetic and non-diabetic subjects, matched for age and body mass index. Evidence of increased oxidative stress in diabetic islets was demonstrated by measuring nitrotyrosine concentration and by electron paramagnetic resonance. This was accompanied by reduced glucose-stimulated insulin secretion, as compared to non-diabetic islets (Stimulation Index, SI: 0.9 +/- 0.2 vs. 2.0 +/- 0.4, P<0.01), and by altered expression of insulin (approximately -60%), catalase (approximately +90%) and glutathione peroxidase (approximately +140%). When type 2 diabetic islets were pre-exposed for 24 h to the new antioxidant bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl)decandioate di-hydrochloride, nitrotyrosine levels, glucose-stimulated insulin secretion (SI: 1.6+/-0.5) and gene expressions improved/normalized. These results support the concept that oxidative stress may play a role in type 2 diabetes beta-cell dysfunction; furthermore, it is proposed that therapy with antioxidants could be an interesting adjunctive pharmacological approach to the treatment of type 2 diabetes.
Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2 diabetic and non-diabetic subjects, matched for age and body mass index. Evidence of increased oxidative stress in diabetic islets was demonstrated by measuring nitrotyrosine concentration and by electron paramagnetic resonance. This was accompanied by reduced glucose-stimulated insulin secretion, as compared to non-diabetic islets (Stimulation Index, SI: 0.9 ± 0.2 vs. 2.0±0.4, P < 0.01), and by altered expression of insulin (approximately –60%), catalase (approximately +90%) and glutathione peroxidase (approximately +140%). When type 2 diabetic islets were pre-exposed for 24 h to the new antioxidant bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl)decandioate di-hydrochloride, nitrotyrosine levels, glucose-stimulated insulin secretion (SI: 1.6 ± 0.5) and gene expressions improved/normalized. These results support the concept that oxidative stress may play a role in type 2 diabetes beta-cell dysfunction; furthermore, it is proposed that therapy with antioxidants could be an interesting adjunctive pharmacological approach to the treatment of type 2 diabetes. Le stress oxydant est considéré un mécanisme important à l'origine des lésions des cellules β dans le diabète type 2. Dans des îlots humains isolés à partir de sujets diabétiques type 2 et non diabétiques, comparables par âge et le BMI, l'augmentation du stress oxydatif a été mise en évidence par l'évaluation des concentrations de nitrotyrosine et par résonance paramagnétique électronique. Par ailleurs, chez les îlots diabétiques, a été mise en évidence une réduction de la sécrétion d'insuline induite par le glucose par comparaison aux îlots témoins, avec en outre, une expression anormale de l'insuline (~ –60 %), de la catalase (~ +90 %) et du glutathion peroxydase (~ 140 %). Après préincubation durant 24 heures des îlots diabétiques en présence d'un nouvel antioxydant, le bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl) decandioate dichlorure, les concentrations de nitrotyrosine et la sécrétion d'insuline induite par le glucose, ainsi que l'expression des gènes mentionnés, se sont améliorés ou normalisés. Ces résultats confirment que le stress oxydant est impliqué dans les altérations des cellules β au cours du diabète type 2 et suggèrent qu'une thérapie antioxydante pourrait constituer une approche complémentaire très intéressante pour le traitement du diabète de type 2.
Abstract Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2 diabetic and non-diabetic subjects, matched for age and body mass index. Evidence of increased oxidative stress in diabetic islets was demonstrated by measuring nitrotyrosine concentration and by electron paramagnetic resonance. This was accompanied by reduced glucose-stimulated insulin secretion, as compared to non-diabetic islets (Stimulation Index, SI: 0.9 ± 0.2 vs. 2.0±0.4, P < 0.01), and by altered expression of insulin (approximately –60%), catalase (approximately +90%) and glutathione peroxidase (approximately +140%). When type 2 diabetic islets were pre-exposed for 24 h to the new antioxidant bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl)decandioate di-hydrochloride, nitrotyrosine levels, glucose-stimulated insulin secretion (SI: 1.6 ± 0.5) and gene expressions improved/normalized. These results support the concept that oxidative stress may play a role in type 2 diabetes beta-cell dysfunction; furthermore, it is proposed that therapy with antioxidants could be an interesting adjunctive pharmacological approach to the treatment of type 2 diabetes.
Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2 diabetic and non-diabetic subjects, matched for age and body mass index. Evidence of increased oxidative stress in diabetic islets was demonstrated by measuring nitrotyrosine concentration and by electron paramagnetic resonance. This was accompanied by reduced glucose-stimulated insulin secretion, as compared to non-diabetic islets (Stimulation Index, SI: 0.9 +/- 0.2 vs. 2.0 +/- 0.4, P<0.01), and by altered expression of insulin (approximately -60%), catalase (approximately +90%) and glutathione peroxidase (approximately +140%). When type 2 diabetic islets were pre-exposed for 24 h to the new antioxidant bis(1-hydroxy-2,2,6,6-tetramethyl-4-piperidinyl)decandioate di-hydrochloride, nitrotyrosine levels, glucose-stimulated insulin secretion (SI: 1.6+/-0.5) and gene expressions improved/normalized. These results support the concept that oxidative stress may play a role in type 2 diabetes beta-cell dysfunction; furthermore, it is proposed that therapy with antioxidants could be an interesting adjunctive pharmacological approach to the treatment of type 2 diabetes.
Author Boggi, U.
Del Prato, S.
Filipponi, F.
Marchetti, P.
Pedulli, G.F.
Mosca, F.
Soleti, A.
Del Guerra, S.
Mancarella, R.
Paolini, M.
Novelli, M.
Lupi, R.
Valgimigli, L.
Masiello, P.
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  organization: Dipartimento di Farmacologia, University of Bologna; Italy
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  organization: Medestea Research, Medestea, Torino, Italy
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  organization: Dipartimento di Oncologia, dei Trapianti e delle Nuove Tecnologie in Medicina, University of Pisa, Italy
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DocumentTitleAlternate Un nouveau scavenger des espèces réactives de l'oxygène corrige in vitro les défauts de la sécrétion d'insuline des îlots diabétiques humains de type 2
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Issue 5
Keywords Type 2 diabetes
Oxidative stress
Sécrétion d'insuline
Human pancreatic islet
Stress oxydant
Diabète type 2
Antioxidant
Insulin secretion
Îlots humains isolés
Antioxydant
Language English
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  article-title: A role for glutathione peroxidase in protecting pancreatic beta cells against oxidative stress in a model of glucose toxicity
  publication-title: Proc. Natl. Acad. Sci. USA
  doi: 10.1073/pnas.192445199
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Snippet Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2 diabetic and...
Abstract Oxidative stress is a putative mechanism leading to beta-cell damage in type 2 diabetes. We studied isolated human pancreatic islets from type 2...
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SubjectTerms Antioxidant
Antioxidants - pharmacology
Antioxydant
Cells, Cultured
Diabetes Mellitus, Type 2 - physiopathology
Diabète type 2
Endocrinology & Metabolism
Glucose - pharmacology
Human pancreatic islet
Humans
Insulin - metabolism
Insulin Secretion
Internal Medicine
Islets of Langerhans - metabolism
Islets of Langerhans - physiopathology
Oxidative stress
Oxidative Stress - physiology
Reactive Oxygen Species - metabolism
Stress oxydant
Sécrétion d'insuline
Type 2 diabetes
Tyrosine - analogs & derivatives
Tyrosine - analysis
Îlots humains isolés
Title Insulin secretion defects of human type 2 diabetic islets are corrected in vitro by a new reactive oxygen species scavenger
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https://dx.doi.org/10.1016/j.diabet.2007.03.005
https://www.ncbi.nlm.nih.gov/pubmed/17616474
https://www.proquest.com/docview/68472738
Volume 33
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