Irisin is a signaling protein that is released into the blood from skeletal muscle after proteolysis of the membrane protein FNDC5 . FNDC5, encoded by the Fndc5 gene. Irisin activity on subcutaneous white adipose tissue, both in culture and in vivo, stimulated UCP1 expression and induction of brown adipocytes in white adipose tissue depots, a process known as white fat ''browning''. Irisin increases total energy expenditure in animal models, and irisin expression in mice fed a high fat diet resulted in a significant improvement in glucose tolerance and a reduction in fasting insulin levels. Collectively, these data suggest that decreased serum irisin levels may be associated with the development of insulin resistance and Type 2 diabetes. Indeed, some studies showed that irisin levels were decreased in newly diagnosed Type 2 diabetes. Endothelial dysfunction is an early physiological event in atherosclerosis. However, to date, no data are available on the relationship between circulating irisin and endothelial dysfunction in diabetes. Therefore, the investigators hypothesized that circulating irisin level is associated with endothelial dysfunction.
- Study Type: Observational
- Study Design
- Time Perspective: Cross-Sectional
- Study Primary Completion Date: December 2013
Arms, Groups and Cohorts
- type 2 diabetes
- We select 200 newly diagnosed type 2 diabetic patients. Plasma irisin levels will be measured, and endothelial function will be determined.
Clinical Trial Outcome Measures
- The relation between plasma irisin and endothelium-dependent vasodilation
- Time Frame: 6 months
Participating in This Clinical Trial
- newly diagnosed type 2 diabetic patients – aged 40～70 years Exclusion Criteria:
- Patients with hypertension and those with micro- and macroangiopathy, including nephropathy [urinary albumin excretion rate (UAER) > 20 μg/min], retinopathy (at least one microaneurysm or hemorrhage or exudates in either eye), neuropathy (pain in extremities, paresthesias, and absent tendon reﬂexes and/or absent vibration sense), coronary artery disease (myocardial infarction, ischemia electrocardiogram changes, and angina), cerebrovascular disease (transient ischemic attack or stroke), and peripheral vascular disease (the abolition of one or more peripheral arterial pulse and/or intermittent claudication and/or a past history of revascularization of the lower limbs) were excluded from the study.
Gender Eligibility: All
Minimum Age: 40 Years
Maximum Age: 70 Years
Are Healthy Volunteers Accepted: Accepts Healthy Volunteers
- Lead Sponsor
- Wuhan General Hospital of Guangzhou Military Command
- Provider of Information About this Clinical Study
- Principal Investigator: Xiang Guang-da, Director of Endocrinol Dept. – Wuhan General Hospital of Guangzhou Military Command
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