Lipoprotein Metabolism in Hypertensive African-Americans

To study relationships among lipoprotein metabolism, hypertension, and hyperinsulinemia-insulin resistance in African American males and females. The study was part of a Collaborative Project on Minority Health which investigated the mechanisms by which insulin contributes to cardiovascular disease.

Study Overview

• Status: Completed
• Conditions: Heart Diseases; Cardiovascular Diseases; Hypertension; Insulin Resistance; Hyperinsulinism

Detailed Description

BACKGROUND:

The study was part of the initiative "Collaborative Projects (R01s) on Minority Health". The concept for the initiative was developed by the NHLBI staff after the 1993 Report of the Committee on Appropriations, House of Representatives, encouraged the NHLBI to establish minority centers to facilitate the diagnosis and treatment of cardiovascular diseases. The initiative was approved at the September 1992 National Heart, Lung, and Blood Advisory Council and released in October 1992.

Julian Marsh was one of three investigators in a collaborative program with Bonita Falkner as Program Coordinator.

DESIGN NARRATIVE:

In a sub-set of subjects with either high or low plasma insulin levels after a glucose challenge (insulin sensitive or insulin resistant), the investigators determined the fractional and absolute synthesis and catabolic rates of apolipoproteins B and A-I, the dominant lipoproteins of Low Density Lipoprotein (LDL) and High Density Lipoprotein (HDL). They used stable isotopes and multicompartmental kinetic analysis following an oral bolus dose of deuteroleucine. They hypothesized that in hypertensive African Americans with hyperinsulinemia, more of the smaller Very Low Density (VLDL) particles are secreted and converted to LDL.

The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.

• Study Type: Observational

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: No older than 100 years (Child, Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Male

Description

No eligibility criteria

Study Plan

How is the study designed?

Collaborators and Investigators

• Sponsor: National Heart, Lung, and Blood Institute (NHLBI)

Publications and helpful links

General Publications

• Sumner AE, Kushner H, Tulenko TN, Falkner B, Marsh JB. The relationship in African-Americans of sex differences in insulin-mediated suppression of nonesterified fatty acids to sex differences in fasting triglyceride levels. Metabolism. 1997 Apr;46(4):400-5. doi: 10.1016/s0026-0495(97)90055-x.
• Sumner AE, Kushner H, Lakota CA, Falkner B, Marsh JB. Gender differences in insulin-induced free fatty acid suppression: studies in an African American population. Lipids. 1996 Mar;31 Suppl:S275-8. doi: 10.1007/BF02637090.
• Sumner AE, Falkner B, Diffenderfer MR, Barrett PH, Marsh JB. A study of the metabolism of apolipoprotein B100 in relation to insulin resistance in African American males. Proc Soc Exp Biol Med. 1999 Sep;221(4):352-60. doi: 10.1046/j.1525-1373.1999.d01-92.x.

Study record dates

Study Major Dates

• Study Start: September 1, 1993
• Study Completion (Actual): August 1, 1998

Study Registration Dates

• First Submitted: May 25, 2000
• First Submitted That Met QC Criteria: May 25, 2000
• First Posted (Estimate): May 26, 2000

Study Record Updates

• Last Update Posted (Estimate): May 13, 2016
• Last Update Submitted That Met QC Criteria: May 12, 2016
• Last Verified: June 1, 2001

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Glucose Metabolism Disorders; Metabolic Diseases; Heart Diseases; Cardiovascular Diseases; Insulin Resistance; Hyperinsulinism
• Other Study ID Numbers: 4918; R01HL051536 (U.S. NIH Grant/Contract)