Estudio alométrico del tamaño corporal y sensibilidad a la peroxidación lipídica en mitocondrias y microsomas de cerebro de diferentes especies de aves.

GUTIERREZ, ANA M., REBOREDO, GUILLERMO R., MOSCA, SUSANA M., CATALÁ, ANGEL.

Huerta Grande Córdoba

Congreso; I Reunión Conjunta de Sociedades de Biología de la República Argentina; 2007

SAB

153. ALLOMETRIC STUDY OF BODY SIZE, FATTY ACID COMPOSITION AND SENSITIVITY TO LIPID PEROXIDATION IN BRAIN MITOCHONDRIA AND MICROSOMES FROM DIFFERENT BIRDS Gutiérrez A, Reboredo G, Mosca S, Catalá A*. Fisiología Animal, Fac. Cs. Nat y Museo, *INIFTA-CONICET, Fac. Cs. Exactas, UNLP. E-mail: anamaria_gutierrez@yahoo.com Cs. Exactas, UNLP. E-mail: anamaria_gutierrez@yahoo.com *INIFTA-CONICET, Fac. Cs. Exactas, UNLP. E-mail: anamaria_gutierrez@yahoo.com The objective of this study was to examine the relation between the corporal size, fatty acid (FA) composition and sensitivity to lipid peroxidation (LP) of mitochondria (MIT) and microsomes (MIC) isolated from brain of birds ranging in size from 10g manon to 5Kg goose. FA was determined using gas chromatography and LP was assessed by chemiluminescence. In MIT, the percentage of MUFA, principally C18:1 was lower in the greater species and showed a significant allometric decline with body weight (r= 0, 96). In MIC, a significant increase of C18:2 (P < 0, 01) and PUFA (P< 0,004) in greater bird’s species was detected. Only MIT of all birds examined suffered LP showing a significant decrease of C20:4 n6 and C22:6 n3 in peroxidized compared to control samples. However, LP did not change when body weight increased. The QL was statistically significant in MIT but not in MIC. The allometric analysis of the QL of both organelles was not statistically significant. These results show that the brain of all birds studied has a high content of C22: 6 n3 being similar to the one of other vertebrates, indicating a high specificity by this tissue.