Subcellular Localization and Polymorphism of Bovine FABP4 in Bovine Intramuscular Adipocytes

Shinichi Yonekura, Shohei Hirota, Honami Miyazaki, Yukako Tokutake

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

ABSTRACT: Fatty acid binding protein 4 (FABP4) I74 V, a gene polymorphism associated with unsaturated fatty acid contents, was discovered in Japanese Black cattle. Individuals with FABP4 I/I genotype contain a significantly high level of palmitoleic acid compared to those with FABP4 V/V genotype. It remains unknown how the FABP4 polymorphism leads to different palmitoleic acid contents. We overexpressed FABP4 of different genotypes in bovine intramuscular preadipocytes and examined whether the intracellular localization of FABP4 and the expression levels of lipid metabolism-related genes were different among cells expressing different genotypes. Nuclear localization was observed for the FABP4 V/V, while the FABP4 I/I almost did not. The cells expressing FABP4 of different genotypes were comparable in terms of the expression levels of genes involved in lipid metabolism. FABP4 I/I was localized in most of the lipid droplets 4 days after differentiation induction, whereas approximately 25% lipid droplet co-localized with FABP4 in cells expressing FABP4 V/V. The lipid droplet size increased when palmitoleic acid was added compared to the size observed when palmitic acid was added. These results suggest that lipid droplet enlargement caused by palmitoleic acid and genotype-dependent differences in the fatty acid transporting capacity underlie variations in palmitoleic acid content among FABP4 polymorphisms.

Original languageEnglish
Pages (from-to)96-103
Number of pages8
JournalAnimal Biotechnology
Volume27
Issue number2
DOIs
Publication statusPublished - 2016 Apr 2
Externally publishedYes

Keywords

  • Adipocyte
  • FABP4
  • Japanese black cattle
  • polymorphism
  • unsaturated fatty acid

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Animal Science and Zoology

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