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JPEN J Parenter Enteral Nutr. 2016 Mar;40(3):383-91. doi: 10.1177/0148607114559429. Epub 2014 Nov 10.

Soybean and Fish Oil Mixture With Different ω-6/ω-3 Polyunsaturated Fatty Acid Ratios Modulates Dextran Sulfate Sodium-Induced Changes in Small Intestinal Intraepithelial γδT-Lymphocyte Expression in Mice.

Author information

1
Department of Anatomy and Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
2
School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei, Taiwan.
3
Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan.
4
Department of Nutrition and Health Sciences, Chinese Culture University, Taipei, Taiwan m8707008@hotmail.com.

Abstract

BACKGROUND:

This study investigated the effect of different ω-6/ω-3 polyunsaturated fatty acid (PUFA) ratios on dextran sulfate sodium (DSS)-induced changes to small intestinal intraepithelial lymphocyte (IEL) γδT-cell expression.

METHODS:

Mice were assigned to 3 control and 3 DSS-treated groups and were maintained on a low-fat semipurified diet. One of the control (S) groups and a DSS (DS) group were provided with soybean oil; the other 2 control (Hω-3 and Lω-3) groups and 2 other DSS (DHω-3 and DLω-3) groups were fed either a soybean and fish oil mixture with a ω-6/ω-3 ratio of 2:1 or 4:1. After feeding the respective diets for 2 weeks, the DSS groups were given distilled water containing 2% DSS, and the control groups were given distilled water for 5 days. All groups were further provided distilled water 5 days for recovery, and the small intestinal IEL γδT-cell subset was isolated for analysis.

RESULTS:

DSS treatment resulted in a lower small intestinal IEL γδT-cell percentage and higher messenger RNA (mRNA) expressions of Reg IIIγ, keratinocyte growth factor (KGF), and complement 5a receptor (C5aR) by IEL γδT cells. Fish oil administration enhanced the proportion of small intestinal IEL γδT cells. Compared with the DLω-3 group, the DHω-3 group had lower Reg IIIγ, KGF, and C5aR mRNA expressions and higher expression of peroxisome proliferator-activated receptor (PPAR)-γ gene by small intestinal IEL γδT cells.

CONCLUSIONS:

Fish oil diets with a ω-6/ω-3 PUFA ratio of 2:1 were more effective than those with a ratio of 4:1 in improving DSS-induced small intestinal injury, and activation of PPAR-γ in IEL γδT cells may be associated with resolution of small intestinal inflammation.

KEYWORDS:

dextran sulfate sodium; fish oil; peroxisome proliferator-activated receptor–γ; small intestinal intraepithelial lymphocyte; γδT cell; ω-6/ω-3 ratio

PMID:
25384382
DOI:
10.1177/0148607114559429
[Indexed for MEDLINE]

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