Metabolism-independent Vascular Effects of the Dipetidylpeptidase-4-inhibitor Sitagliptin in Patients With Type 2 Diabetes Mellitus
Trial Snapshot
- Phase
- Phase 4
- Sponsor
- Hannover Medical School
- Enrollment
- 70
- Locations
- 1
- Primary Endpoint
- Endothelial function
Study Overview
Brief Summary
Glucagon-like peptide 1 (GLP-1) is a 30-amino acid gut hormone secreted in a nutrient-dependent manner that stimulates insulin secretion and inhibits glucagon secretion and gastric emptying, thereby reducing postprandial glycemia.1,2 GLP-1 is derived from posttranslational proteolysis of preproglucagon, and its peptide sequence is identical in mouse, rat, and human.2,3 After secretion from enteroendocrine L cells, GLP-1(7-36) amide is rapidly degraded by dipeptidyl peptidase-4 (DPP-4) to its N-terminally truncated metabolite GLP-1(9-36), which does not interact with the known GLP-1 receptor.4,5 The diverse actions of GLP-1 include the proliferation, differentiation, and protection from apoptosis of pancreatic β cells and the induction of satiety. GLP-1 also improves memory and learning, stimulates afferent sensory nerves, and has neuroprotective functions.1,6 Furthermore, GLP-1 receptor agonists have been reported to have cardiac and vascular actions in rodents and humans that include effects on contractility, blood pressure, cardiac output,7-10 and cardioprotection.11-14
Detailed Description
The aim of this study is to evaluate the effect of a therapy with the DPP-4-inhibitor sitagliptin on the prognostic relevant endothelial function and endothelial progenitor cells in patients with type 2 diabetes mellitus.
Primary endpoint: Endothelium-dependent vasodilation before and after treatment of patients with type 2 diabetes mellitus with the DPP-4-inhibitor Sitagliptin and placebo treatment respectively.
Secondary endpoint: effect of sitagliptin on mobilization, NO-production and in vivo regenerative capacity of human endothelial progenitor cells before and after treatment of patients with type 2 diabetes mellitus with the DPP-4-inhibitor sitagliptin and placebo treatment respectively
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Treatment
- Masking
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Eligibility Criteria
- Ages
- 18 Years to 80 Years (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •Type 2 Diabetes mellitus
Exclusion Criteria
- •Allergy to sitagliptin
- •Treatment with PPAR-gamma agonist
Arms & Interventions
Sitagliptin
100 mg sitagliptin per day for 2 weeks
Intervention: Sitagliptin (Drug)
Placebo
1 placebo tablet per day for 2 weeks
Intervention: Placebo (Drug)
Healthy Control
Healthy control subjects
Intervention: Control (Other)
Outcomes
Primary Outcomes
Endothelial function
Time Frame: Before and after two week treatment
Effect of sitagliptin on endothelium-dependent vasodilation before and after treatment of patients with type 2 diabetes mellitus with the DPP-4-inhibitor sitagliptin and placebo treatment respectively
Secondary Outcomes
- Effect on EPCs(Before and after two week treatment)