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Clinical Trial Summary

The purpose of the study is to learn how blood vessel function is altered by diabetes. We are studying an investigational drug, Ebselen, to see if it can improve the ability of blood vessels to relax (widen).


Clinical Trial Description

A major cause of death and disability in patients with diabetes mellitus is atherosclerosis. Endothelial dysfunction is an important, if not primary, factor in atherogenesis. Nitric oxide is an important substance made and released by the endothelium. Many prior studies in animals and humans have shown that the ability of the blood vessel to dilate is impaired in diabetes. This process of vasodilation is mediated by a substance, nitric oxide, which is thought to be highly susceptible to destruction by oxidant molecules. In previous studies, we found that acute administration of the antioxidant, vitamin C, improves endothelium-dependent vasodilation in blood vessels of patients with type 1 and type 2 diabetes. This suggests that by scavenging oxidants, such as superoxide, vitamin C may reduce the destruction of nitric oxide and thereby preserve endothelial function. Additional mechanisms, including activation of a substance called protein kinase C, and oxidant stress from excess soluble peroxides may be present in diabetes and interact with oxidant stress to cause endothelial dysfunction in patients with diabetes. Accordingly, we would like to study both of these mechanisms to determine their contribution to endothelial dysfunction. ;


Study Design

Allocation: Randomized, Endpoint Classification: Pharmacokinetics Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Basic Science


Related Conditions & MeSH terms


NCT number NCT00762671
Study type Interventional
Source Brigham and Women's Hospital
Contact
Status Completed
Phase Phase 2/Phase 3
Start date May 1999
Completion date October 2007

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