Strain-related differences in urine composition of male rats of potential relevance to urolithiasis.
In carcinogenicity studies with PPAR gamma and alpha/gamma agonists, urinary bladder tumors have been reported in Harlan Sprague-Dawley (HSD) and Charles River Sprague-Dawley (SD) but not Wistar (WI) rats, with urolithiasis purported to be the inciting event. In two 3-month studies, the authors investigated strain-related differences in urine composition by sampling urine multiple times daily. Urine pH, electrolytes, creatinine, protein, citrate and oxalate levels, and serum citrate were assessed; urine sediment was analyzed by scanning electron microscopy and energy dispersive x-ray spectroscopy. HSD rats had significantly higher urine calcium than SD or WI rats, primarily as calcium phosphate-containing precipitate. When compared to SD rats, HSD rats had lower urine volume, higher urine protein, and a comparable (week 4) to lower (week 13) burden of MgNH(4)PO(4) aggregates. Relative to WI rats, HSD rats had higher urine protein and magnesium and lower serum and urine citrate. Overall, the susceptibility to urolithiasis in male rats was HSD > SD > WI; this was likely due to strain-related differences in the amount of urine protein (a nidus for crystal formation), lithogenic ions, citrate (an inhibitor of lithogenesis), and/or volume. Strain-related differences in urine composition need to be considered when interpreting the outcome of studies with compounds that alter urine composition.
Tannehill-Gregg
Sarah H
SH
Bristol-Myers Squibb Research & Development, Department of Drug Safety Evaluation, Mount Vernon, Indiana, USA. sarah.tannehill-gregg@bms.com
Dominick
Mark A
MA
Reisinger
Amy J
AJ
Moehlenkamp
Jeffrey D
JD
Waites
C Robbie
CR
Stock
David A
DA
Sanderson
Thomas P
TP
Cohen
Samuel M
SM
Arnold
Lora L
LL
Schilling
Beth E
BE
D000818:Animals; D002118:Calcium / Q000652:urine; D002130:Calcium Phosphates / Q000652:urine; D002951:Citrates / Q000097:blood / Q000652:urine; D003404:Creatinine / Q000652:urine; D004573:Electrolytes / Q000652:urine; D006863:Hydrogen-Ion Concentration; D008274:Magnesium / Q000652:urine; D017616:Magnesium Compounds / Q000652:urine; D008297:Male; D008855:Microscopy, Electron, Scanning; D010070:Oxalates / Q000652:urine; D010710:Phosphates / Q000652:urine; D011507:Proteinuria / Q000139:chemically induced; D051381:Rats; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D013045:Species Specificity; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D000069877:Struvite; D016482:Urinalysis; D052878:Urolithiasis / Q000139:chemically induced*
D002130:Calcium Phosphates; D002951:Citrates; D004573:Electrolytes; D017616:Magnesium Compounds; D010070:Oxalates; D010710:Phosphates; C020243:calcium phosphate; D000069877:Struvite; D003404:Creatinine; D008274:Magnesium; D002118:Calcium