title: [Morphological and biochemical comparison among aged rats fed with hyperlipidic and canola oil diet].
abstract: OBJECTIVE
  To observe cardiovascular and metabolic changes due to canola oil diet (rich in n-3 fatty acid).
  
  
  METHODS
  Forty five rats were followed during 15 months separated in three groups. In group aged (A), they received a regular diet. In group H, animals received a hyperlipidic diet and in group O they received a canola oil diet. The rats were fed for 15 months after weaning. At the end of the experience a blood analysis was performed and heart and aorta were analyzed. The total lipids were extracted and the LDL, VLDL and HDL were determined.
  
  
  RESULTS
  Total cholesterol and triglyceride levels were not different among groups. Differences were found in body and cardiac weight, the thickness of the right and left ventricular wall, aorta and pulmonary diameters, HDL and LDL (p < 0.05). Smallest values of the cardiac weight and thickness of the ventricular walls were found in group O. The aorta and pulmonary internal diameters were smaller in group H. The HDL was 40% greater in group O than in groups A and H while the LDL was more than 80% lower in group O than in groups A and H. Differences in survival curves between groups H x A and between H x O were significant (p < 0.05) but not between groups A x O (p = 0.48).
  
  
  CONCLUSIONS
  Aged rats fed with canola oil diet (rich in n-3 fatty acid) presented morphological cardiovascular and metabolic changes less important in magnitude than old animals and, mainly, the same age animals under hyperlipidic diet.
authors.affiliation: Departamento de Histologia e Embriologia, Instituto de Biologia, UERJ.
authors.forename: M B
authors.initials: MB
authors.lastname: Aguila
authors.forename: M I
authors.initials: MI
authors.lastname: Apfel
authors.forename: C A
authors.initials: CA
authors.lastname: Mandarim-de-Lacerda
mesh_terms: D000375:Aging; D000704:Analysis of Variance; D000818:Animals; D001011:Aorta / Q000033:anatomy & histology; D001835:Body Weight; D008076:Cholesterol, HDL / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D002914:Chylomicrons / Q000097:blood; D004032:Diet / Q000009:adverse effects*; D015525:Fatty Acids, Omega-3 / Q000009:adverse effects; D006321:Heart / Q000033:anatomy & histology; D006352:Heart Ventricles / Q000033:anatomy & histology; D008297:Male; D009929:Organ Size; D010938:Plant Oils / Q000009:adverse effects*; D011651:Pulmonary Artery / Q000033:anatomy & histology; D051381:Rats; D017208:Rats, Wistar; D014280:Triglycerides / Q000097:blood
chemical_list: D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D002914:Chylomicrons; D015525:Fatty Acids, Omega-3; D010938:Plant Oils; D014280:Triglycerides