Diet modulates proteinuria in heterozygous female dogs with X-linked hereditary nephropathy.
Young adult heterozygous (carrier) female dogs with X-linked hereditary nephropathy (XLHN) have glomerular proteinuria but are otherwise healthy. Because data regarding dietary influences on the magnitude of proteinuria in dogs with spontaneous glomerular disease are not available, 12 such dogs were studied in a double crossover experiment intended to determine effects of altering dietary protein intake for up to 6 weeks. Dogs were blocked by urine protein : creatinine ratio (UPC) and randomly assigned to receive 2 diets: high protein (34.6% dry matter [DM], HP) or low protein (14.1% DM, LP) fed in HP-LP-HP or LP-HP-LP sequence. Food intake was measured daily, body weight (BW) was measured twice weekly, and UPC, plasma creatinine, blood urea nitrogen, phosphorus, albumin, and protein concentrations were measured at 2-week intervals. Nutrient digestibility was measured during the third treatment period. Diet had a significant effect (P < .0001) on all measured variables except plasma phosphorus (P > .5), but unintended differences in digestibility of protein and energy (P < or = .01) prevented assignment of the diet effect exclusively to protein. Proteinuria was greater (UPC 4.7 +/- 2.2 versus 1.8 +/- 1.1, P < .0001) when the HP diet was fed, but the LP diet did not maintain starting BW or plasma albumin concentration within the normal reference range. Diet greatly affects the magnitude of proteinuria in XLHN carrier females. Dietary protein restriction can reduce proteinuria in dogs with glomerular disease, but BW and blood protein concentrations may not be maintained if the restriction is too severe.
Burkholder
William J
WJ
Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843-4474, USA.
Lees
George E
GE
LeBlanc
Amy K
AK
Slater
Margaret R
MR
Bauer
John E
JE
Kashtan
Clifford E
CE
McCracken
Barbara A
BA
Hannah
Steven S
SS
D000818:Animals; D001774:Blood Chemical Analysis / Q000662:veterinary; D001835:Body Weight; D018592:Cross-Over Studies; D004044:Dietary Proteins / Q000008:administration & dosage*; D004283:Dog Diseases / Q000097:blood / Q000178:diet therapy* / Q000235:genetics / Q000652:urine; D004285:Dogs; D004435:Eating; D005260:Female; D020022:Genetic Predisposition to Disease; D007674:Kidney Diseases / Q000178:diet therapy / Q000235:genetics / Q000662:veterinary*; D016896:Treatment Outcome
D004044:Dietary Proteins