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Major role of soybean oil in preventing decrease in CYP4A1 mRNA content relative to PPARalpha mRNA down-regulation in
Masuhiro Nishimura1, Aiko Yamauchi, Mari Yamaguchi
1Division of Pharmacology, Drug Safety and Metabolism, Otsuka Pharmaceutical Factory Inc., 115 Tateiwa, Muya-cho, Naruto, Tokushima 772-8601, Japan. nisimums@otsukaj.co.jp
Biological & Pharmaceutical Bulletin
|August 5, 2005
Summary
Including fat in total parenteral nutrition (TPN) is crucial for infant rats, as fat-free TPN significantly reduces CYP4A1 mRNA levels. This finding highlights the importance of fat in TPN regimens for maintaining liver gene expression.
Area of Science:
- Biochemistry
- Molecular Biology
- Pediatric Nutrition
Background:
- Total parenteral nutrition (TPN) is a critical feeding method for infants unable to receive nutrition orally.
- The composition of TPN, particularly the inclusion of lipids, can influence metabolic pathways.
- Specific genes like CYP4A1, PPARalpha, and RXRalpha are involved in lipid metabolism and detoxification.
Purpose of the Study:
- To investigate the impact of fat-free versus fat-containing TPN on key gene expression in infant rat livers.
- To determine the correlation between CYP4A1, PPARalpha, and RXRalpha mRNA levels under different TPN conditions.
Main Methods:
- Three-week-old male Sprague-Dawley rats were assigned to three groups: oral diet, fat-free TPN, and TPN with 20% soybean oil emulsion.
- Liver tissue was analyzed for mRNA expression levels of CYP4A1, PPARalpha, and RXRalpha using quantitative methods.
- Statistical analysis was performed to compare gene expression levels and assess correlations.
Main Results:
- Fat-free TPN significantly downregulated CYP4A1, PPARalpha, and RXRalpha mRNA expression compared to oral diet and fat-containing TPN.
- A strong positive correlation was observed between CYP4A1 and PPARalpha mRNA levels (r=0.849).
- A weaker correlation was found between CYP4A1 and RXRalpha mRNA levels (r=0.618).
Conclusions:
- The inclusion of fat in TPN regimens is essential for preventing the downregulation of CYP4A1 mRNA in infant rat livers.
- Changes in PPARalpha mRNA levels may play a role in the observed downregulation of CYP4A1 mRNA.
- This study provides the first evidence of a strong correlation between CYP4A1 and PPARalpha mRNA following TPN in infant rats, emphasizing the importance of lipid inclusion.