title: Alterations of fatty acid β-oxidation capability in the liver of ketotic cows.
abstract: Dairy cows are highly susceptible to ketosis after parturition. In the present study, we evaluated the expression of fatty acid β-oxidation-related enzymes in the liver of ketotic (n=6) and nonketotic (n=6) cows. Serum levels of nonesterified fatty acids (NEFA), β-hydroxybutyrate (BHBA), and glucose were determined by using standard biochemical techniques. The mRNA abundance and protein content of acyl-CoA synthetase long-chain (ACSL), carnitine palmitoyltransferase I (CPT I), carnitine palmitoyltransferase II (CPT II), acyl-CoA dehydrogenase long chain (ACADL), 3-hydroxy-3-methylglutaryl-CoA synthase (HMGCS), and acetyl-CoA carboxylase (ACC) were evaluated by real-time PCR and ELISA. We found that serum glucose levels were lower in ketotic cows than in nonketotic cows, but serum BHBA and NEFA concentrations were higher. Messenger RNA and protein levels of ACSL were significantly higher in livers of ketotic cows than those in nonketotic cows. In contrast, mRNA levels of CPT I and mRNA and protein levels of CPT II, ACADL, HMGCS, and ACC were decreased in the liver of ketotic cows. Serum NEFA concentration positively correlated with ACSL protein levels and negatively correlated with protein levels of CPT II, HMGCS, ACADL, and ACC. In addition, serum BHBA concentration negatively correlated with protein levels of CPT II, HMGCS, and ACADL. Overall, fatty acid β-oxidation capability was altered in the liver of ketotic compared with nonketotic cows. Furthermore, high serum NEFA and BHBA concentrations play key roles in affecting pathways of fatty acid metabolism in the liver.
authors.affiliation: Department of Clinical Veterinary Medicine, College of Animal Science and Veterinary Medicine, Jilin University, Changchun 130062, Jilin, China.
authors.forename: P
authors.initials: P
authors.lastname: Li
authors.forename: X B
authors.initials: XB
authors.lastname: Li
authors.forename: S X
authors.initials: SX
authors.lastname: Fu
authors.forename: C C
authors.initials: CC
authors.lastname: Wu
authors.forename: X X
authors.initials: XX
authors.lastname: Wang
authors.forename: G J
authors.initials: GJ
authors.lastname: Yu
authors.forename: M
authors.initials: M
authors.lastname: Long
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.forename: G W
authors.initials: GW
authors.lastname: Liu
mesh_terms: D020155:3-Hydroxybutyric Acid / Q000097:blood; D000103:Acetyl-CoA Carboxylase / Q000032:analysis / Q000235:genetics; D044944:Acyl-CoA Dehydrogenases / Q000032:analysis / Q000235:genetics; D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D002334:Carnitine O-Palmitoyltransferase / Q000032:analysis / Q000235:genetics; D002417:Cattle; D002418:Cattle Diseases / Q000201:enzymology*; D003066:Coenzyme A Ligases / Q000032:analysis / Q000235:genetics; D005227:Fatty Acids / Q000378:metabolism*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D006904:Hydroxymethylglutaryl-CoA Synthase / Q000032:analysis / Q000235:genetics; D007662:Ketosis / Q000201:enzymology / Q000662:veterinary*; D008099:Liver / Q000201:enzymology*; D010084:Oxidation-Reduction; D011644:Puerperal Disorders / Q000201:enzymology / Q000662:veterinary*; D012333:RNA, Messenger / Q000032:analysis
chemical_list: D001786:Blood Glucose; D005227:Fatty Acids; D005230:Fatty Acids, Nonesterified; D012333:RNA, Messenger; D044944:Acyl-CoA Dehydrogenases; D002334:Carnitine O-Palmitoyltransferase; D006904:Hydroxymethylglutaryl-CoA Synthase; D003066:Coenzyme A Ligases; D000103:Acetyl-CoA Carboxylase; D020155:3-Hydroxybutyric Acid