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 in | Diabetes & metabolism Vol. 33; no. 5; pp. 340 - 345 |
|---|---|
| Main Authors | , , , , , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
France
Elsevier Masson SAS
01.11.2007
|
| Subjects | |
| Online Access | Get full text |
| ISSN | 1262-3636 1878-1780 |
| DOI | 10.1016/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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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/17616474$$D View this record in MEDLINE/PubMed |
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| Keywords | Type 2 diabetes Oxidative stress Sécrétion d'insuline Human pancreatic islet Stress oxydant Diabète type 2 Antioxidant Insulin secretion Îlots humains isolés Antioxydant |
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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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