The purpose of this multi-disciplinary project is to provide this outstanding candidate with mentored training in patient-oriented research focused on complications of cirrhosis and liver transplantation (LT) outcomes and to prepare her for a career as an independent clinician-scientist. The candidate's research and training activities will be closely supervised and guided by a primary mentor, co-mentors, an Advisory Committee and consultants, each with unique expertise germane to different aspects of the proposed project. The candidate's preliminary data showed that women with serum creatinine (Cr) e 1.0 mg/dl had lower survival rates on the LT waiting list compared to men;this was likely caused by underestimating renal dysfunction in women when using Cr rather than glomerular filtration rate (GFR) to calculate Model for End-Stage Liver Disease (MELD) scores. Moreover, serum Cr is not an accurate biomarker to detect kidney dysfunction in cirrhosis regardless of gender. The PI will test the hypotheses that (1) gender disparity is caused by underestimating severity of kidney disease in women when using serum Cr rather than GFR to calculate MELD scores, (2) that cystatin C and symmetric dimethylarginine (SDMA) are more accurate biomarkers of renal function in cirrhosis than Cr, and (3) that an equation that includes serum cystatin C, SDMA or both and patient characteristics will be more accurate and precise for determining renal dysfunction in subjects with cirrhosis than existing Cr- and cystatin C-based GFR-estimating equations that were derived in populations without cirrhosis. To test these hypotheses, the PI proposes three Specific Aims: 1) Test the hypothesis that gender disparity on the LT waiting list is caused by underestimating renal dysfunction in women when using serum Cr rather than GFR to calculate MELD scores. The PI will elucidate factors underlying gender disparity on the LT waiting list by analyzing United Network for Organ Sharing data of subjects with cirrhosis listed between 2002 and 2009. 2) Establish an accurate biomarker of kidney function in cirrhosis. The PI will enroll 100 subjects with cirrhosis, directly measure GFR using the validated method of non-radiolabeled iothalamate plasma clearance and simultaneously measure serum cystatin C, SDMA, Cr and 24-hour urinary Cr clearance and compare the accuracy of each biomarker for estimating true GFR. 3) Develop an accurate and precise equation to estimate GFR in cirrhosis. The PI will derive and assess the performance of a novel GFR-estimating equation in cirrhosis, based on serum cystatin C, SDMA or both and patient characteristics. The results of this study are anticipated to spur modifications of the MELD score that will reduce gender disparity in liver allocation and establish an inexpensive, readily available, accurate, non-invasive measure of kidney function in cirrhosis. The mentored research training and courses supported by this K23 award will provide the PI with excellent grounding for a successful academic career in health services and patient-oriented research.

Public Health Relevance

Cirrhosis (advanced scarring of the liver) is a leading cause of death and the most common indication for liver transplantation. Patients with cirrhosis are at high risk to develop kidney disease. If kidney disease is not timely and accurately detected in patients with cirrhosis, it may progress to kidney failure and lead to higher mortality rates in women on the liver transplant waiting list causing gender disparity. Currently, existing blood and urine tests are not sensitive enough to detect kidney injury in patients with cirrhosis. This proposed project will examine the gender disparity on the liver transplant waiting list, how well the kidneys work (kidney function) and determine which blood tests are the most accurate for detecting kidney disease in cirrhosis.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Mentored Patient-Oriented Research Career Development Award (K23)
Project #
5K23DK089008-04
Application #
8464079
Study Section
Special Emphasis Panel (ZDK1-GRB-8 (M2))
Program Officer
Podskalny, Judith M,
Project Start
2010-07-01
Project End
2015-06-30
Budget Start
2013-07-01
Budget End
2014-06-30
Support Year
4
Fiscal Year
2013
Total Cost
$183,276
Indirect Cost
$13,576
Name
University of Maryland Baltimore
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
188435911
City
Baltimore
State
MD
Country
United States
Zip Code
21201
Mindikoglu, Ayse L; Dowling, Thomas C; Wong-You-Cheong, Jade J et al. (2014) A pilot study to evaluate renal hemodynamics in cirrhosis by simultaneous glomerular filtration rate, renal plasma flow, renal resistive indices and biomarkers measurements. Am J Nephrol 39:543-52
Urrunaga, N H; Rachakonda, V P; Magder, L S et al. (2014) Outcomes of living versus deceased donor liver transplantation for acute liver failure in the United States. Transplant Proc 46:219-24
Reddy, Srinevas K; Reilly, Colleen; Zhan, Min et al. (2014) Long-term influence of chemotherapy on steatosis-associated advanced hepatic fibrosis. Med Oncol 31:971
Mindikoglu, Ayse L; Dowling, Thomas C; Weir, Matthew R et al. (2014) Performance of chronic kidney disease epidemiology collaboration creatinine-cystatin C equation for estimating kidney function in cirrhosis. Hepatology 59:1532-42
Mindikoglu, Ayse L; Weir, Matthew R (2013) Current concepts in the diagnosis and classification of renal dysfunction in cirrhosis. Am J Nephrol 38:345-54
Mindikoglu, Ayse L; Emre, Sukru H; Magder, Laurence S (2013) Impact of estimated liver volume and liver weight on gender disparity in liver transplantation. Liver Transpl 19:89-95
Aslinia, F M; Wasan, S K; Mindikoglu, A L et al. (2012) End-stage renal disease and African American race are independent predictors of mild liver fibrosis in patients with chronic hepatitis C infection. J Viral Hepat 19:371-6
Magder, Laurence S; Regev, Arie; Mindikoglu, Ayse L (2012) Comparison of seven liver allocation models with respect to lives saved among patients on the liver transplant waiting list. Transpl Int 25:409-15
Mindikoglu, Ayse L; King, Dale; Magder, Laurence S et al. (2011) Valproic acid-associated acute liver failure in children: case report and analysis of liver transplantation outcomes in the United States. J Pediatr 158:802-7
Mindikoglu, A L; Raufman, J P; Seliger, S L et al. (2011) Simultaneous liver-kidney versus liver transplantation alone in patients with end-stage liver disease and kidney dysfunction not on dialysis. Transplant Proc 43:2669-77

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