title: Dietary trans-10, cis-12 conjugated linoleic acid reduces early glomerular enlargement and elevated renal cyclooxygenase-2 levels in young obese fa/fa zucker rats.
abstract: Conjugated linoleic acid (CLA) slows the progression of disease in models of chronic kidney disease. Because obesity is associated with nephropathy and increased renal cyclooxygenase (COX) levels, the effects of dietary CLA on kidney function, morphology, and COX protein levels in the kidneys of young obese (fa/fa) Zucker rats, a model of metabolic syndrome, were examined. In study 1, 6-wk-old fa/fa and lean Zucker rats were given a mixture of CLA isomers (1.5% CLA, wt:wt) or the control diet (CTL) with no CLA for 8 wk. To examine specific isomer effects, study 2 used the same model with the following diets: 0.4% (g/g) cis-9, trans-11 (c9,t11) CLA; 0.4% trans-10, cis-12 (t10,c12) CLA; a combination of these 2 isomers (0.4% each); or CTL diets with no CLA. In study 1, fa/fa rats given the CLA mixture had 11% smaller kidney weights and 28% smaller glomeruli, and feed intake and body weight did not differ from the CTL rats. In study 2, diet also did not affect body weights, but fa/fa rats given a diet containing t10,c12 CLA had 7% lower kidney weights, 20% smaller glomeruli, and 39% lower COX-2 protein levels than CTL rats. In conclusion, dietary t10,c12 CLA reduces the enlargement of glomeruli in young obesity-associated nephropathy and is associated with lower protein levels of renal COX-2. Long-term studies with CLA supplementation are required to determine whether these changes would lead to reduction in development of renal disease associated with obesity.
authors.affiliation: Department of Human Nutritional Sciences,, University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: Breanne
authors.initials: B
authors.lastname: Drury
authors.forename: Lori J
authors.initials: LJ
authors.lastname: Warford-Woolgar
authors.forename: Dielle J
authors.initials: DJ
authors.lastname: Herchak
authors.forename: Neda
authors.initials: N
authors.lastname: Bankovic-Calic
authors.forename: Gary
authors.initials: G
authors.lastname: Crow
authors.forename: Carla G
authors.initials: CG
authors.lastname: Taylor
authors.forename: Peter
authors.initials: P
authors.lastname: Zahradka
authors.forename: Malcolm R
authors.initials: MR
authors.lastname: Ogborn
authors.forename: Harold M
authors.initials: HM
authors.lastname: Aukema
mesh_terms: D000818:Animals; D015153:Blotting, Western; D001835:Body Weight / Q000187:drug effects; D051546:Cyclooxygenase 2 / Q000378:metabolism*; D005247:Feeding Behavior; D007678:Kidney Glomerulus / Q000187:drug effects* / Q000201:enzymology / Q000473:pathology; D044243:Linoleic Acids, Conjugated / Q000737:chemistry / Q000494:pharmacology*; D008297:Male; D009765:Obesity / Q000201:enzymology / Q000473:pathology*; D009929:Organ Size / Q000187:drug effects; D051381:Rats; D011924:Rats, Zucker
chemical_list: D044243:Linoleic Acids, Conjugated; D051546:Cyclooxygenase 2