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- Oskarsson, PR, et al.
(författare)
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Circulating insulin inhibits glucagon secretion induced by arginine in type 1 diabetes
- 2000
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Ingår i: European journal of endocrinology. - : Oxford University Press (OUP). - 0804-4643 .- 1479-683X. ; 142:1, s. 30-34
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: To evaluate if insulin has a suppressive effect on the glucagon secretion stimulated by arginine in type 1 diabetes. RESEARCH DESIGN AND METHODS: The alpha-cell response to an i.v. bolus of arginine (150mgkg(-1)) followed by an infusion of arginine (10mgkg(-1)min(-1)) was studied in random order during either low dose infusion (LDT) or high dose infusion (HDT) of insulin in ten patients with type 1 diabetes. The blood glucose level was clamped at an arterialized level of 5mmoll(-1) by a variable infusion of glucose. Venous C-peptide, glucagon, growth hormone, and insulin were analyzed. RESULTS: The mean plasma concentration of insulin was four times higher during the HDT. The C-peptide level did not differ between the LDT and the HDT. During the LDT in response to arginine the blood glucose level increased from 5.0 to 5.8mmol l(-1) although the glucose infusion was markedly reduced, while no change was seen during the HDT. A significantly smaller increase in the glucagon levels during the HDT was seen (area under the curve of 413+/-45 vs 466+/-44pgml(-1)h(-1), P=0.03) while the growth hormone levels were almost identical. CONCLUSION: This study demonstrates that a high level of circulating insulin exerts an inhibitory effect on the glucagon response to arginine in type 1 diabetes. Thus, the suppressive effect of insulin on the glucagon release from the alpha-cell seems to be general and not only dependent on stimulation by hypoglycemia.
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- Santesson, P, et al.
(författare)
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Skin microvascular function in patients with type 1 diabetes: An observational study from the onset of diabetes
- 2017
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Ingår i: Diabetes & vascular disease research. - : SAGE Publications. - 1752-8984 .- 1479-1641. ; 14:3, s. 191-199
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Tidskriftsartikel (refereegranskat)abstract
- The development of disturbances in skin microcirculation in type 1 diabetes is not well characterised. We assessed skin microcirculation longitudinally from the onset of diabetes up to 29 years of duration to investigate when such disturbances start. Material and methods: Seventeen adult patients with type 1 diabetes participated. Skin microvascular function in digit IV of the left hand was investigated by laser Doppler fluxmetry (LDF, arbitrary units [AU]). LDF was carried out at rest and following one-min arterial occlusion. Time to peak LDF (s) and percentage increase of LDF (post-occlusive reactive hyperaemia, PRH%) were determined. Retinopathy was assessed from fundus photographs or ophthalmoscopic recordings. Results: Skin microvascular function remained normal during the first five years. Compared with baseline and a non-diabetic reference group, time to peak LDF was prolonged after 7–9 years of diabetes ( p < 0.01). PRH% was lower than in the reference group after 7–9 years ( p < 0.01), and lower than baseline after 24–29 years of diabetes ( p < 0.05). All but one patient developed retinopathy and the first signs were found after 10 years of diabetes. Conclusions: Functional disturbances in total skin microcirculation were observed after seven years in patients with type 1 diabetes and preceded diabetic complications such as retinopathy.
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- Tehrani, S, et al.
(författare)
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Impaired endothelium-dependent skin microvascular function during high-dose atorvastatin treatment in patients with type 1 diabetes
- 2013
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Ingår i: Diabetes & vascular disease research. - : SAGE Publications. - 1752-8984 .- 1479-1641. ; 10:6, s. 483-488
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Tidskriftsartikel (refereegranskat)abstract
- The present study investigated the effects of lipid-lowering therapy with atorvastatin on skin microvascular function in patients with type 1 diabetes and dyslipidaemia. Methods: Twenty patients received daily treatment with atorvastatin 80 mg or placebo during 2 months in a randomised, double-blind, cross-over study. Forearm skin microcirculation was investigated with laser Doppler perfusion imaging during iontophoresis of acetylcholine and sodium nitroprusside to assess endothelium-dependent and endothelium-independent microvascular reactivity, respectively. Various biochemical markers of endothelial function were also investigated. Results: Endothelium-dependent microvascular reactivity decreased during atorvastatin ( p < 0.001), showing a significant treatment effect compared with placebo ( p = 0.04). Atorvastatin treatment was also associated with increased haemoglobin A1C levels from 7.45% to 7.77% ( p = 0.008). Conclusions: The present study shows impaired endothelium-dependent skin microvascular function during high-dose atorvastatin treatment in patients with type 1 diabetes, thus implicating a risk for deterioration of microvascular function during such therapy in these patients.
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- Wisniewski, N, et al.
(författare)
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Analyte flux through chronically implanted subcutaneous polyamide membranes differs in humans and rats
- 2002
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Ingår i: American journal of physiology. Endocrinology and metabolism. - : American Physiological Society. - 0193-1849 .- 1522-1555. ; 282:6, s. E1316-E1323
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Tidskriftsartikel (refereegranskat)abstract
- The rat is commonly used to evaluate physiological responses of subcutaneous tissue to implanted devices. In vivo longevity of various devices and the biocompatibility of biomaterials depend on how adjacent tissue interacts. How closely the rat model predicts the human response has not been well characterized. The objective of this study was to compare rat and human subcutaneous foreign body responses by monitoring the biochemical environment at a polymer-tissue interface over 8 days using microdialysis. Polyamide microdialysis probes were implanted subcutaneously in humans and rats ( n = 12). Daily microdialysis samples were analyzed for glucose, lactate, pyruvate, glycerol, and urea. Blood glucose was also monitored. Analyte concentrations differed significantly between rats and humans at the implant-tissue interface. There were also qualitative differences in the 8-day trends. For example, over 8 days, microdialysate glucose increased two- to fourfold in humans but decreased in rats ( P < 0.001). This study reveals profound physiological differences at material-tissue interfaces in rats and humans and highlights the need for caution when extrapolating subcutaneous rat biocompatibility data to humans.
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