PubMed · 13793965
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D H APPELMAN. 1959. Diabetic detection.. https://pubmed.ncbi.nlm.nih.gov/13793965/
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Insulin analogues, developed by molecular engineering, have structural changes in the A and B insulin chains. These modifications change their action profile, rendering insulin replacement closer to physiology. Rapid acting analogues like lispro, aspart and glulisine, are absorbed rapidly from the subcutaneous tissue to the circulation. In addition, two long acting insulin analogues have been developed: glargine and detemir. The combination of a long acting insulin, to maintain baseline levels, and multiple daily doses of a rapid acting analogue are the mainstay of basal-bolus therapy. Multiples studies have compared human insulin (NPH and regular) with insulin analogues in patients with type 1 or 2 diabetes mellitus, showing an improvement in the metabolic control, fewer hypoglycemic events and better quality of life. In summary, insulin analogues offer new therapeutic options and allow an individualized intensive treatment.
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BACKGROUND: In vitro glycation of transferrin leads to increased oxidative stress by impairing iron-binding antioxidant capacity. The aim of this study is to develop a method to evaluate in vivo transferrin glycation in diabetes. METHODS: We adapted the nitroblue tetrazolium assay to measure in micro-well plates the fructosamine content of transferrin isolated from serum by immunocomplexation. RESULTS: Introduction of the immunocomplexation step did not affect the analytical performance of the fructosamine measurement and analytical variability was lower than 7%. The diabetic group (n=107) had significantly higher transferrin glycation (1.39+/-1.12 versus 0.79+/-1.09 micromol fructosamine/g transferrin in the non-diabetic group, n=91, p<0.0005) and this was most pronounced in type 1 diabetes (1.95+/-1.02 versus 1.06+/-1.04 micromol fructosamine/g transferrin in type 2, p<0.0005). Transferrin glycation was associated with parameters of glycaemic control but did not correlate with serum iron or total iron-binding capacity. Total iron-binding capacity was lower in type 1 diabetes (63+/-9 versus 69+/-12 micromol/l in type 2, p<0.05) and was mainly determined by transferrin concentration. CONCLUSIONS: These results indicate that the adapted nitroblue tetrazolium assay combined with immunocomplexation of serum transferrin is suitable to detect differences in in vivo transferrin glycation between non-diabetic, type 1 and type 2 diabetic subjects.