title: Maturation-dependent acquired coronary structural alterations and atherogenesis in the Dahl sodium-sensitive hypertensive rat.
abstract: BACKGROUND
  The Dahl sodium-sensitive hypertensive rat exhibits atherogenic lesions after the initiation of a high-sodium/high-fat diet. This study was designed to gauge the effect of a preadolescent high-fat diet on the postadolescent rate of atherogenesis after supplementation of the diet with sodium.
  
  
  RESULTS
  Fifty-three Dahl S male rats were assigned to 2 dietary groups for the postweaning to early adolescence period (3 to 12 weeks): 29 to a standard diet (low-fat/low-sodium) and 24 to a high-fat/low-sodium diet. At age 9 weeks (just after puberty), animals from the high-fat group exhibited a relatively diminished density of coronary elastic fibers. There was no evidence of either lipid or monocytic infiltration of the subendothelial space. At age 12 weeks, most or all of the remaining animals in both groups were switched to a high-sodium/high-fat diet and were sampled through the following 8 weeks for the appearance of arterial lipid. After the switch, the high-fat-conditioned animals developed more extensive atherosclerotic pathological lesions more rapidly than their prepubertal standard-diet counterparts. The importance of the animal's stage of maturation in this effect was underscored by the observation that delaying onset of the high-fat diet to early adolescence resulted in no ultimate difference from the pubertal controls in elastic fiber density.
  
  
  CONCLUSIONS
  The maturation-dependent high-fat conditioning of these postweanling rats correlated with an accelerated rate of atherogenesis on the initiation of the high-sodium/high-fat diet, possibly as a direct result of an alteration in arterial elasticity.
authors.affiliation: Department of Hospital Laboratories, UMass Memorial Medical Center, Worcester, Mass 01605-2376, USA. kieferc@ummhc.org
authors.forename: Charles R
authors.initials: CR
authors.lastname: Kiefer
authors.forename: James B
authors.initials: JB
authors.lastname: McKenney
authors.forename: Jane F
authors.initials: JF
authors.lastname: Trainor
authors.forename: L Michael
authors.initials: LM
authors.lastname: Snyder
mesh_terms: D000375:Aging; D000818:Animals; D003324:Coronary Artery Disease / Q000139:chemically induced / Q000473:pathology*; D003331:Coronary Vessels / Q000187:drug effects / Q000473:pathology*; D004036:Diet, Atherogenic; D004039:Diet, Sodium-Restricted; D004041:Dietary Fats / Q000494:pharmacology; D004195:Disease Models, Animal; D018450:Disease Progression; D004547:Elastic Tissue / Q000473:pathology; D004549:Elastin; D008055:Lipids; D008297:Male; D051381:Rats; D020303:Rats, Inbred Dahl; D012741:Sexual Maturation; D012982:Sodium, Dietary / Q000494:pharmacology
chemical_list: D004041:Dietary Fats; D008055:Lipids; D012982:Sodium, Dietary; D004549:Elastin