The study is to determine the dose response relationship of insulin glargine in type 2 diabetes over a 24-hour period and measuring the differences in glucose production among the differing doses of glargine. Hypothesis: Differing doses of insulin glargine over a 24-hour period in type 2 diabetes will show differing effects on endogenous glucose production, glucose disposal and carbohydrate and lipid flux.
The incidence of type 2 DM is increasing worldwide at an alarming rate. Unfortunately, the number of individuals with glycemic control at or below the American Diabetes Association goal of 7% has dropped. In fact, the number of patients with their important cardiometabolic risk factors of glucose, lipids and blood pressure at goal is only 7%. One of the reasons for this lack of metabolic control in type 2 DM is the continued relative underutilization of insulin. Diabetes is an insulin deficient state and requires appropriate physiologic replacement of insulin. Physiologic replacement of insulin requires a basal component to restrain overnight endogenous glucose production, lipolysis and proteolysis. The other component involves prandial insulin to regulate post prandial glucose levels. Recently, insulin glargine was introduced as a once-a-day peakless basal insulin. This form of basal insulin reproduces the normal constitutive physiologic release of insulin from the pancreas. Insulin glargine represents a breakthrough in treatment as the previous available "basal insulins" either produced peaks of activity (which are disadvantageous as this results in hypoglycemia) or do not last 24 hrs which results in post absorbative hyperglycemia. Despite the undoubted advantages of insulin glargine, there remains a lack of information regarding some aspects of glargine action. The study objectives are: 1) to determine the pharmacokinetic and pharmacodynamic dose response relationship of insulin glargine in Type 2 DM; 2) partition the dose response relationship of insulin glargine on endogenous glucose production and glucose uptake in Type 2 DM; and 3) to determine if the pharmacokinetic and pharmacodynamics of insulin glargine are consistent over a wide range of doses.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
20
single dose of Placebo injected s/c at 8am and monitor blood glucose over 24 hours
8 weeks later, a differing dose (0.5, 1.0, 1.5, 2.0 u/kg body wt.) of Insulin Glargine and monitoring over a 24 hour period each separated by 8 weeks (5 separate study visits)
Vanderbilt University
Nashville, Tennessee, United States
Maximum Glucose Infusion Rate
measuring the changes in glucose infusion rate during the 24 hour experimental period.
Time frame: 24 hours
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