Long-term glycemic control influences the long-lasting effect of hyperglycemia on endothelial function in type 1 diabetes
Ceriello, Antonio, Esposito, Katherine, Ihnat, Michael, Thorpe, Jessica and Giugliano, Dario. (2009) Long-term glycemic control influences the long-lasting effect of hyperglycemia on endothelial function in type 1 diabetes. Journal of Clinical Endocrinology & Metabolism, Vol.94 (No.8). pp. 2751-2756. ISSN 0021-972xFull text not available from this repository.
Official URL: http://dx.doi.org/10.1210/jc.2009-0762
Objective: The objective of the study was to investigate the effect of different periods of hyperglycemia on the reversal of endothelial dysfunction by glucose normalization and antioxidant therapy.
Research Design and Methods: Ten healthy subjects and three subgroups of 10 type 1 diabetic subjects were enrolled as follows: 1) patients within 1 month of diagnosis; 2) patients between 4.5 and 5.2 yr from diagnosis and with glycosylated hemoglobin levels 7% or greater since diagnosis; 3) patients between 4.8 and 5.4 yr from diagnosis and with glycosylated hemoglobin levels greater than 7% since diagnosis. Each patient participated in three experiments: 1) 24-h insulin treatment, achieving a near normalization of glycemia, together with the addition of the antioxidant vitamin C during the last 12 h; 2) 24-h vitamin C treatment with insulin treatment for the last 12 h; and 3) treatment with both vitamin C and insulin for 24 h.
Results: Endothelial function, as measured by flow-mediated vasodilation of the brachial artery and levels of nitrotyrosine, an oxidative stress marker, were normalized by each treatment in subgroups 1 and 2. In the third subgroup, neither glucose normalization nor vitamin C treatment alone was able to normalize endothelial dysfunction or oxidative stress. Combining insulin and vitamin C, however, normalized endothelial dysfunction and nitrotyrosine.
Conclusions: This study suggests that long-lasting hyperglycemia in type 1 diabetic patients induces long-term alterations in endothelial cells, which may contribute to endothelial dysfunction and is interrupted only by both glucose and oxidative stress normalization. (J Clin Endocrinol Metab 94: 2751-2756, 2009)
|Item Type:||Journal Article|
|Subjects:||R Medicine > RC Internal medicine|
|Divisions:||Faculty of Medicine > Warwick Medical School|
|Journal or Publication Title:||Journal of Clinical Endocrinology & Metabolism|
|Official Date:||August 2009|
|Number of Pages:||6|
|Page Range:||pp. 2751-2756|
|Access rights to Published version:||Restricted or Subscription Access|
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