title: Food deprivation changes peroxisomal beta-oxidation activity but not catalase activity during postnatal development in pig tissues.
abstract: Peroxisomal beta-oxidation and catalase activity were investigated in liver, kidney and heart from pigs at the following timepoints: within 0.5 h after birth (0 h, unfed) and at 24 h (suckled or unsuckled), 10 d (suckled or 24-h food-deprived), 21 d (suckled or 24-h food-deprived) and 5 mo (overnight food-deprived). In liver, peroxisomal beta-oxidation increased about twofold at 24 h for suckled pigs (P < 0.001) but did not change for unsuckled pigs. The rate was further increased in 21-d-old pigs compared with 0- (P < 0. 001) or 24-h-old (P < 0.05) pigs, but was lower at 5 mo than at 10 or 21 d (P < 0.01). The rate was higher for food-deprived pigs than suckled pigs at 10 d (P < 0.001) of age. In kidney, peroxisomal beta-oxidation was unchanged during the first 24 h but was higher (P < 0.05) at 10 d for suckled pigs and at 21 d than at 0 h. Nutritional state did not influence renal peroxisomal beta-oxidation. In heart, peroxisomal beta-oxidation did not change with age or nutritional state. The developmental pattern of fatty acyl-CoA oxidase activity was similar to that of peroxisomal beta-oxidation in each tissue. Developmental increases of peroxisomal beta-oxidation were greater than those for first-cycle peroxisomal beta-oxidation reported earlier, suggesting that peroxisomal beta-oxidation became more complete in older pigs. Catalase activity did not change during the first 24 h after birth but then increased 10.5-, 2.9-fold and 33% at 10 d in liver, kidney and heart, respectively. The concentration of catalase mRNA was only 1.1- and 1. 3-fold higher at 10 d than at 24 h in liver and kidney, respectively. Catalase activity was not affected by food deprivation. We concluded the following: 1) peroxisomal beta-oxidation develops rapidly after birth and may be important for piglets to oxidize milk fatty acids; 2) food is required for the initial induction after birth; and 3) rapidly increased catalase activity during the first 10 d of life resulted from both pretranslational and post-translational regulation.
authors.affiliation: Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
authors.forename: X X
authors.initials: XX
authors.lastname: Yu
authors.forename: J K
authors.initials: JK
authors.lastname: Drackley
authors.forename: J
authors.initials: J
authors.lastname: Odle
mesh_terms: D000375:Aging; D000818:Animals; D000833:Animals, Suckling; D015152:Blotting, Northern; D002374:Catalase / Q000378:metabolism*; D005508:Food Deprivation; D007668:Kidney / Q000201:enzymology / Q000648:ultrastructure; D008099:Liver / Q000201:enzymology / Q000648:ultrastructure; D008297:Male; D008830:Microbodies / Q000378:metabolism*; D009206:Myocardium / Q000201:enzymology / Q000648:ultrastructure; D009752:Nutritional Status; D010084:Oxidation-Reduction; D013552:Swine / Q000254:growth & development* / Q000378:metabolism
chemical_list: D002374:Catalase