Regulation of Intestinal and Hepatic Lipoprotein Production by Glucose and Fructose (glucose)
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government.
Read our disclaimer for details.
Increased postprandial plasma triglycerides are associated with increased cardiovascular risk. Chronic consumption of carbohydrates is associated with increased levels of triglycerides. Very few studies have assessed the effect of acute consumption of carbohydrates on plasma triglycerides and lipoprotein production and clearance. The present study aims to assess the effects of acute administration of glucose and fructose on hepatic and intestinal lipoprotein production.
Condition or disease
Other: Intraduodenal glucose or fructose
Each subject will be studied twice 4-6 weeks apart in random order in this single blinded study. A nasoduodenal tube will be sited under fluoroscopic guidance the day prior to the study.In study A they will receive intraduodenal intralipid (20% at 60 ml/hour) alongside 60 ml/hour of 20% dextrose or fructose for 15 hours starting at 4am. In study B they will receive 60 ml/hour of intraduodenal intralipid with 60ml/hour of normal saline for 15 hours from 4am. A pancreatic clamp (octreotide with replacement glucose, insulin, glucagon and growth hormone) will be started at 7am. From 9am an iv bolus of deuterated-glycerol (d5-glycerol) along with a regular infusion of deuterated leucine (L-[5,5,5-2H3]. Regular blood samples will be drawn to assess lipoprotein kinetics.
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study:
18 Years to 60 Years (Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Men and women, aged 18 to 60 years
Body mass index 20 kg/m2 to 27 kg/m2
Hemoglobin above 130g/L.
Normal glucose tolerance in response to a 75g, 2-hr OGTT
Subject has a history of hepatitis/hepatic disease that has been active within the previous two years.
Any significant active (over the past 12 months) disease of the gastrointestinal, pulmonary, neurological, renal (Cr > 1.5 mg/dL), genitourinary, hematological systems, or has severe uncontrolled treated or untreated hypertension (sitting diastolic BP > 100 or systolic > 180) or proliferative retinopathy
History of diabetes or OGTT indicative of diabetes or impaired glucose tolerance.
Any history of a MI or clinically significant, active, cardiovascular history including a history of arrhythmia's or conduction delays on ECG, unstable angina, or decompensated heart failure.
Any laboratory values: AST > 2x ULN; ALT > 2x ULN TSH > 6 mU/l
Current addiction to alcohol or substances of abuse as determined by the investigator.
Mental incapacity, unwillingness or language barrier precluding adequate understanding or cooperation
Taking any prescription or non-prescription medications at the time of the study
Having donated blood three months prior to and three months post study procedures
A pregnancy test will be performed 1 to 3 days prior to each study in all female subjects. Those who test positive for pregnancy will be excluded.