Autosomal dominant polycystic kidney disease (ADPKD) is a major cause of morbidity and is the fourth leading cause of ESRD in the world, affecting more than 500,000 U.S. citizens. Researchers at the University of Alabama, Emory University, University of Kansas, Mayo Clinic and Washington University joined together in 2000 to create the Consortium for Radiologic Imaging Studies of Polycystic Kidney Disease (CRISP I);in 2006, the University of Pittsburgh replaced Washington University for CRISP II. The primary objectives of CRISP I and II were: to establish accurate, reliable and reproducible magnetic resonance based measurements of total kidney volume (TKV), liver cyst volume (LCV), renal blood flow (RBF), and patterns of cyst growth and expansion. Based on 7.3 years of longitudinal follow up in 200 CRISP l/ll participants, we now can: 1) establish an uniquivocal relationship between TKV and qualitative (patient reported outcomes) and quantitative (renal insufficiency) end-ppints;as well as 2) identify potential modifiable risk factors associating with TKV and LCV for intervention studies. TKV ultimately may be used as a surrogate marker of disease progression in clinical trials. The goals of CRISP III extend the observations of CRISP l/ll. The overarching Aim for CRISP III is to develop and enhance prediction models that best predict renal insufficiency in ADPKD. Specifically, Aim 1: Extend the serial quantification of TKV and LCV to develop and test new models for predicting the risk of developing renal insufficiency.
Aim 2 : Determine the extent to which age and sex-adjusted measurements of RBF predict the rate of change in TKV and determine if RBF and TKV independently predict the risk of developing renal insufficiency.
Aim 3 : Develop methods to quantify the influence of renal cyst number, volume, and topography at baseline on the subsequent course of TKV and GFR and the risk of developing renal insufficiency.
Aim 4 : Expand and analyze CRISP biological samples to improve genotype/phenotype and biomarker studies.
Aim 5. Determine whether intensive dietary counseling and intervention in a small group of CRISP participants is successful in modifying the relatively fixed pattern of sodium intake observed in CRISP I and reducing the rate of growth of the polycystic kidneys.

Public Health Relevance

The results of these studies will impact the lives of patients with ADPKD. Developing predictive markers of disease severity early, prior to loss of renal insufficiency will result in increased efficiency of therapy/drug development and result in increased life expectancy and improved quality of life in patients with ADPKD.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project--Cooperative Agreements (U01)
Project #
5U01DK056957-13
Application #
8481538
Study Section
Special Emphasis Panel (ZDK1-GRB-R (J1))
Program Officer
Flessner, Michael Francis
Project Start
2000-02-01
Project End
2016-05-31
Budget Start
2013-06-01
Budget End
2014-05-31
Support Year
13
Fiscal Year
2013
Total Cost
$340,928
Indirect Cost
$92,914
Name
Mayo Clinic, Rochester
Department
Type
DUNS #
006471700
City
Rochester
State
MN
Country
United States
Zip Code
55905
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