Project 2 wlW test the hypothesis that in non-ICSF most stones do not originate as overgrowths on duct of Bellini crystal plugs. We have established that in ICSF, calcium oxalate stones form as overgrowths on interstitial deposits of hydroxyapatite (Randall's plaque) in patients with large stone burden requiring PNL. We will extend this approach to patients with ICSF and smaller stones who will be treated with URS utilizing digital instrumentation in order to investigate the generalizability of our observation of calcium oxalate overgrovi/th on plaque and, further, that plaque abundance correlates with histologic and metabolic data, as well as clinical stone events. We will also investigate the discordance between acidic bulk urine and tubular deposits of apatie or urate in stone formers with ileostomy and non-bariatric enteric hyperoxaluria utilizing a novel fiberoptic pH microsensor to test the hypothesis that injured BD have local acidification defects enabling deposition of crystals favoring a more alkaline millieu. Finally, we will compare CaP stone content of calyceal stones with a papillary injury scoring system testing the hypothesis that more severely damaged calyces will have more impairment of tubular acidification resulting in a higher percentage of CaP content in stones produced.

Public Health Relevance

Nephrolithiasis is a common condition representing a lifetime occurrence risk of 10% of men and 7% of women. There appear to be at least 3 ways that stones can form in kidneys. Project 2 will study the initiating events in stone formation to determine the sequence of injury that resulting in formation of specific stone types, which will lead to more specific and effective preventive and surgical treatments for these patients.

National Institute of Health (NIH)
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Research Program Projects (P01)
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Special Emphasis Panel (ZDK1-GRB-R)
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University of Chicago
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Borofsky, Michael S; Paonessa, Jessica E; Evan, Andrew P et al. (2016) A Proposed Grading System to Standardize the Description of Renal Papillary Appearance at the Time of Endoscopy in Patients with Nephrolithiasis. J Endourol 30:122-7
Witzmann, Frank A; Evan, Andrew P; Coe, Fredric L et al. (2016) Label-free proteomic methodology for the analysis of human kidney stone matrix composition. Proteome Sci 14:4
Handa, Rajash K; Lingeman, James E; Bledsoe, Sharon B et al. (2016) Intraluminal measurement of papillary duct urine pH, in vivo: a pilot study in the swine kidney. Urolithiasis 44:211-7
Borofsky, Michael S; Wollin, Daniel A; Reddy, Thanmaya et al. (2016) Salvage Percutaneous Nephrolithotomy: Analysis of Outcomes following Initial Treatment Failure. J Urol 195:977-81
Hoover, Robert S; Tomilin, Viktor; Hanson, Lauren et al. (2016) PTH modulation of NCC activity regulates TRPV5 Ca2+ reabsorption. Am J Physiol Renal Physiol 310:F144-51
Williams Jr, James C; Worcester, Elaine; Lingeman, James E (2016) What can the microstructure of stones tell us? Urolithiasis :
Zisman, Anna L; Evan, Andrew P; Coe, Fredric L et al. (2015) Do kidney stone formers have a kidney disease? Kidney Int 88:1240-1249
Evan, Andrew P; Worcester, Elaine M; Coe, Fredric L et al. (2015) Mechanisms of human kidney stone formation. Urolithiasis 43 Suppl 1:19-32
Bhojani, Naeem; Paonessa, Jessica E; Hameed, Tariq A et al. (2015) Nephrocalcinosis in Calcium Stone Formers Who Do Not have Systemic Disease. J Urol 194:1308-12
Evan, Andrew P; Worcester, Elaine M; Williams Jr, James C et al. (2015) Biopsy proven medullary sponge kidney: clinical findings, histopathology, and role of osteogenesis in stone and plaque formation. Anat Rec (Hoboken) 298:865-77

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