Impairment of VLDL secretion by medium-chain fatty acids in chicken primary hepatocytes is affected by the chain length

Kan Sato, Yositake Cho, Shizuko Tachibana, Tomoyuki Chiba, Wolfgang J. Schneider, Yukio Akiba

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

To determine the effect of the chain length of medium-chain fatty acids (MCFAs) on VLDL secretion, the media of chicken hepatocyte cultures were supplemented with hexanoate (6:0), octanoate (8:0), decanoate (10:0), or dodecanoate (12:0). The supplementation of palmitate (16:0) or bovine serum albumin (BSA) alone in media was used as the positive control or the control, respectively. Palmitate significantly increased intracellular triacylglycerol (TG) accumulation and VLDL-TG, -cholesterol, and -apolipoprotein (apo)B secretion. On the other hand, the addition of hexanoate did not affect these variables relative to control cultures supplemented with BSA alone, whereas octanoate, decanoate, and dodecanoate decreased apoB secretion from the chicken hepatocytes. ApoB secretion from hepatocytes cultured with 1.0 mmol/L MCFA, in particular decanoate and dodecanoate, in the presence of 0.2 mmol/L palmitate was significantly lower than that obtained with 0.2 mmol/L palmitate alone. Decanoate at 0.25-1.0 mmol/L dose dependently reduced apoB mRNA expression compared with the control (BSA alone). The levels of 3-hydroxy-3-metylglutaryl- CoA reductase and apoA-I mRNA were significantly lower in cultures supplemented with hexanoate, octanoate, and decanoate than in cultures with dodecanoate and palmitate. These changes did not correspond to the reduction in VLDL-apoB secretion. We suggest that MCFAs with different chain lengths differentially affect apoB secretion and mRNA expression, with decanoate being the most effective at decreasing VLDL-apoB secretion by regulating apoB mRNA expression at the transcriptional level.

Original languageEnglish
Pages (from-to)1636-1641
Number of pages6
JournalJournal of Nutrition
Volume135
Issue number7
DOIs
Publication statusPublished - 2005 Jul

Keywords

  • Apolipoprotein B
  • Chicken hepatocyte primary culture
  • Medium-chain fatty acid
  • Triacylglycerol
  • VLDL

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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