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Eur J Nutr ; 51(1): 97-106, 2012 Feb.
Article in English | MEDLINE | ID: mdl-21512820

ABSTRACT

BACKGROUND: Vitamin A deficiency induces activation of NF-kB and impairs activities of antioxidant enzymes in aorta. AIM OF THE STUDY: We study the effect of vitamin A deficiency on the aorta histoarchitecture and the possibly contribution of its prooxidant and inflammatory effects to artery alterations. METHODS: Twenty-one-day-old Wistar male rats were fed during 3 months with vitamin A-deficient diet (-A, n = 8) or the same diet containing 8 mg of retinol palmitate/kg of diet (+A, control, n = 8). In aortas, thiobarbituric reactive substances and reduced glutathione levels were measured by spectrophotometry. Expressions of TNF-alpha, NOX-2, VCAM-1, and TGF-beta1 were assessed by RT-PCR and Western Blot. The morphology of aorta was examined by light and transmission electron microscopy. RESULTS: In -A rats, high levels of TBARS in serum and aorta and low levels of GSH in aorta were found. An increased expression of TNF-alpha, NOX-2, VCAM-1, and TGF-beta1 in aorta from -A rats was observed. Examination of the intimal layer by light microscopy indicated the presence of an irregular surface in -A aortas. TEM studies showed large vacuoles and multivesicular bodies along the endothelium and also multivesicular bodies in the subendothelial space of aortas from -A rats. Furthermore, the histological appearance of internal elastic lamina was different from control. Small vesicles in the medial layer were observed in aortas from vitamin A-deficient rats. CONCLUSIONS: Vitamin A deficiency produces histoarchitectural alterations in aorta, which can be associated, at least in part, to the oxidative stress and inflammation induced by vitamin A deficiency.


Subject(s)
Aorta/immunology , Aorta/ultrastructure , Oxidative Stress , Vasculitis/etiology , Vitamin A Deficiency/pathology , Vitamin A Deficiency/physiopathology , Animals , Aorta/metabolism , Cytokines/genetics , Cytokines/metabolism , Gene Expression Regulation , Glutathione/metabolism , Male , Membrane Glycoproteins/genetics , Membrane Glycoproteins/metabolism , Multivesicular Bodies/ultrastructure , NADPH Oxidase 2 , NADPH Oxidases/genetics , NADPH Oxidases/metabolism , Oxidation-Reduction , RNA, Messenger/metabolism , Random Allocation , Rats , Rats, Wistar , Thiobarbituric Acid Reactive Substances/metabolism , Tunica Intima/ultrastructure , Vacuoles/ultrastructure , Vascular Cell Adhesion Molecule-1/genetics , Vascular Cell Adhesion Molecule-1/metabolism , Vitamin A Deficiency/immunology , Vitamin A Deficiency/metabolism
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