Related Experiment Videos
Elevated plasma endothelin-1 levels in diabetes mellitus
Jochen G Schneider1, Nicole Tilly, Thomas Hierl
1Department of Internal Medicine I, Ruprecht-Karls-University of Heidelberg, Bergheimer Strasse 58, D-69115 Heidelberg, Germany.
American Journal of Hypertension
|November 21, 2002
Summary
Patients with diabetes or hypertension show elevated endothelin-1 (ET-1) levels. While ET-1 does not correlate with blood pressure in these groups, it is lower in diabetics taking ACE inhibitors, suggesting a potential role in vascular complications.
Area of Science:
- Endocrinology
- Cardiovascular Research
- Metabolic Disorders
Background:
- Plasma endothelin-1 (ET-1) is implicated in cardiovascular regulation.
- Elevated ET-1 levels are observed in conditions like diabetes mellitus and hypertension.
- The relationship between ET-1, metabolic control, and vascular complications requires further elucidation.
Purpose of the Study:
- To compare plasma ET-1 levels in patients with diabetes or hypertension versus healthy controls.
- To investigate correlations between ET-1 levels and glycemic control, metabolic parameters, and vascular complications.
- To assess the impact of angiotensin-converting enzyme (ACE) inhibitors on ET-1 levels in diabetic patients.
Main Methods:
- A cohort study involving 103 type 1 diabetes patients, 124 type 2 diabetes patients, 35 hypertensive patients, and 99 healthy controls.
- Plasma ET-1 concentrations were measured using a standardized assay.
- Statistical analyses were performed to compare groups and assess correlations between ET-1, clinical parameters, and medication use.
Main Results:
- Plasma ET-1 levels were significantly higher in patients with type 1 diabetes, type 2 diabetes, and hypertension compared to controls.
- Diabetic patients treated with ACE inhibitors exhibited significantly lower plasma ET-1 levels than those not on ACE inhibitors.
- In healthy controls, ET-1 levels showed significant associations with age and systolic blood pressure; however, in diabetic patients, associations with age, vascular complications, and glycemic control were weak or non-significant.
Conclusions:
- Elevated plasma ET-1 levels are characteristic of diabetes mellitus and hypertension.
- The correlation between ET-1 and blood pressure observed in healthy individuals is absent in diabetic and hypertensive patients.
- Lower ET-1 levels in diabetic patients on ACE inhibitors suggest a therapeutic effect, and changes in ET-1 may precede vascular complications in these conditions.