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Mechanisms of Chronic Kidney Disease (CKD)-Induced Foam Cell Formation

This study has been completed.
Merck Sharp & Dohme Corp.
Information provided by (Responsible Party):
Valentina Kon, Vanderbilt University Identifier:
First received: August 20, 2012
Last updated: March 10, 2017
Last verified: March 2017
There is currently little understanding of macrophage cholesterol homeostasis and foam cell formation across the spectrum of CKD. We hypothesize that an inverse relationship exist between the severity of CKD and processes underlying foam cell formation, and that the relationship becomes independent of serum lipoprotein levels as renal function declines. We propose to systematically examine scavenger receptors and cholesterol uptake as well as cholesterol transporters and efflux mechanisms in individuals with normal renal function, patients with moderate CKD. We further propose to determine if processed contributing to foam cell formation are related to the plasma lipid profile and if the relationship is modified by co-morbidities, such as diabetes, obesity, systemic inflammation which are common in this population and directly influence vascular integrity. These data will be critically important to understand when the abnormality starts and will provide crucial information.

Chronic Kidney Disease Cardiovascular Disease

Study Type: Observational
Study Design: Observational Model: Case-Only
Time Perspective: Retrospective
Official Title: Mechanisms of CKD-Induced Foam Cell Formation

Resource links provided by NLM:

Further study details as provided by Valentina Kon, Vanderbilt University:

Primary Outcome Measures:
  • In Vitro Lipoprotein Functions [ Time Frame: Once, at enrollment ]
    Cholesterol efflux. Baseline and outcome measurements are the same. The cholesterol efflux was measured once using HDL isolated from CKD and control patients. There was no intervention,this assessment was performed once in each group. The measurement of cholesterol efflux is performed by an in vitro assay in cultured cells. Cells are loaded with cholesterol and maintained for 72 hours. The media of the cultured cells is then changed and the new media contains HDL from CKD or control patients. In additional cells, no HDL is added. The cells are maintained for 24 hours, and intracellular cholesterol is assessed. The cholesterol efflux represents the amount of cholesterol that was leached by HDL from each of our study groups. Thus, cells not exposed to any HDL will contain the highest intracellular cholesterol content. The amount of cholesterol in cells exposed to CKD HDL or control HDL reflects the efflux capacity of that HDL. This is expressed as percent of cholesterol removed by HDL.

Enrollment: 103
Study Start Date: February 2013
Study Completion Date: April 2015
Primary Completion Date: April 2015 (Final data collection date for primary outcome measure)
CKD not on dialysis
Patients with CKD not on dialysis (CKD III-IV)
Controls with normal kidney function (Control)


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population

Patients with CKD not on dialysis (CKD III-IV)

Controls with normal kidney function (Control)


Inclusion Criteria:

Patients with moderate degree of CKD, or patients with advanced CKD or control subjects with intact kidney function

Male or female

All ethnic groups

≥ 18 years and have signed informed consent

Exclusion Criteria:

Pregnancy and current smoking

BMI > 45

Rheumatoid arthritis and systemic lupus erythematosus

History of active or chronic hepatitis B, history of active or chronic hepatitis C, human immunodeficiency virus (HIV)

For moderate CKD subjects: nephrotic syndrome

For control subjects: nephrotic syndrome, patients with estimated GFR < 60 mL/min/1.73 m^2, or proteinuria

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Please refer to this study by its identifier: NCT01671605

United States, Tennessee
Vanderbilt Outpatient Dialysis Center
Nashville, Tennessee, United States, 37232
Sponsors and Collaborators
Vanderbilt University Medical Center
Merck Sharp & Dohme Corp.
Principal Investigator: Valentina Kon, MD Vanderbilt University Medical Center
  More Information

Responsible Party: Valentina Kon, Principal Investigator, Vanderbilt University Identifier: NCT01671605     History of Changes
Other Study ID Numbers: 090846
Study First Received: August 20, 2012
Results First Received: November 22, 2016
Last Updated: March 10, 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

Additional relevant MeSH terms:
Cardiovascular Diseases
Kidney Diseases
Renal Insufficiency, Chronic
Urologic Diseases
Renal Insufficiency processed this record on August 18, 2017