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Title: A physiologically relevant atherogenic diet causes severe endothelial dysfunction within 4 weeks in rabbit.
Austin Authors: Rai, Sudarshan;Hare, David L ;Zulli, Anthony
Affiliation: Departments of Cardiology and Medicine, University of Melbourne, Austin Health, Australia
Issue Date: 15-Sep-2009
Publication information: International Journal of Experimental Pathology 2009; 90(6): 598-604
Abstract: A physiological atherogenic human diet consists of 0.1% cholesterol, fat, as well as high levels of methionine, which is the precursor to homocysteine. The pathological effects of a diet enriched with physiologically high levels of cholesterol, methionine and fat over a short period on the aorta are unknown. In this regard, we sought to determine the effects of a 0.1% cholesterol diet in combination with a 1% methionine over a 4-week period on endothelial function and artery pathology and the expression of endothelial nitric oxide synthase as well as nitrosative stress by nitrotyrosine (NT), oxidative stress by heat shock protein 70 (HSP70) and endoplasmic reticulum stress by glucose regulated protein 78 (GRP78). Rabbits were fed for 4 weeks a diet supplemented with 1% methionine + 0.1% cholesterol + 5% peanut oil (MC). The endothelial function of the abdominal aorta was examined using organ bath techniques, atherosclerosis determined in each artery by microscopy and eNOS, NT, GRP78 and HSP70 by standard immunohistochemistry. Endothelium dependent relaxation in response to acetylcholine significantly decreased by 63% at 1 muM acetylcholine (P < 0.001) compared with control arteries. There was no evidence of atherosclerosis formation in any artery studied, however, eNOS, NT and GRP78 was clearly present in all arteries studied but HSP70 was not easily detectable. Severe endothelial dysfunction is present in the abdominal aorta of rabbits within 4 weeks of physiological dietary manipulation, possibly due to NT formation and endoplasmic reticulum stress. This model could be used to study the early onset of endothelial dysfunction prior to the initiation of atherosclerosis.
Gov't Doc #: 19758419
DOI: 10.1111/j.1365-2613.2009.00668.x
ORCID: 0000-0001-9554-6556
Journal: International journal of experimental pathology
PubMed URL: 19758419
Type: Journal Article
Subjects: Acetylcholine.administration & dosage
Aorta, Abdominal.pathology.physiopathology
Aortic Diseases.etiology.pathology.physiopathology
Cholesterol, Dietary
Diet, Atherogenic
Dose-Response Relationship, Drug
Endoplasmic Reticulum.metabolism
Endothelium, Vascular.drug effects.pathology.physiopathology
HSP70 Heat-Shock Proteins.metabolism
Heat-Shock Proteins.metabolism
Methionine.administration & dosage
Nitric Oxide Synthase Type III.metabolism
Severity of Illness Index
Time Factors
Tyrosine.analogs & derivatives.metabolism
Vasodilator Agents.administration & dosage
Appears in Collections:Journal articles

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