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. doi:10.1210/jc.2009-0762 ISSN 0021-972x.

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Abstract

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 Science, Engineering and Medicine > Medicine > Warwick Medical School
Journal or Publication Title:	Journal of Clinical Endocrinology & Metabolism
Publisher:	Endocrine Society
ISSN:	0021-972x
Official Date:	August 2009
Dates:	Date Event August 2009 Published
Volume:	Vol.94
Number:	No.8
Number of Pages:	6
Page Range:	pp. 2751-2756
DOI:	10.1210/jc.2009-0762
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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