Epigenetic switching and neonatal nutritional environment

Koshi Hashimoto, Yoshihiro Ogawa

研究成果: 著書/レポートタイプへの貢献

2 引用 (Scopus)

抜粋

The hepatic metabolic function changes sequentially during early life in mammals to adapt to the drastic changes in the nutritional environment. Accordingly, hepatic fatty acid β-oxidation is activated after birth to produce energy from breast milk lipids. De novo lipogenesis is induced upon the onset of oral intake, when the major nutritional source switches to carbohydrate. However, how a particular metabolic pathway is activated during the liver maturation is poorly understood. We found that the expression of glycerol-3-phosphate acyltransferase 1 (GPAT1), a rate-limiting enzyme of de novo hepatic lipogenesis, is epigenetically regulated in the mouse liver by DNA methylation. In the neonatal liver, DNA methylation of the GPAT1 gene (Gpam) promoter, which is likely to be induced by DNA methyltransferase (Dnmt) 3b, inhibited the recruitment of sterol regulatory element-binding protein-1c (SREBP-1c), whereas in the adult, decreased DNA methylation resulted in active chromatin conformation, allowing the recruitment of SREBP-1c. Maternal nutritional environment affects the DNA methylation status in the Gpam promoter, GPAT1 expression, and triglyceride content in the liver of the offspring. We also found DNA demethylation and increased mRNA expression of the fatty acid β-oxidation genes in the postnatal mouse liver. The DNA demethylation is specifically induced in the lactation period. Analysis of mice deficient in the nuclear receptor peroxisome proliferator-activated receptor α (PPARα) and maternal administration of a PPARα ligand during the gestation and lactation periods reveals that the DNA demethylation is PPARα-dependent. These findings indicate the gene- and lifestage-specific DNA demethylation of a particular metabolic pathway in the neonatal liver to adapt the marked changes in nutritional environment in early life.

元の言語英語
ホスト出版物のタイトルAdvances in Experimental Medicine and Biology
出版者Springer New York LLC
ページ19-25
ページ数7
DOI
出版物ステータス出版済み - 1 1 2018

出版物シリーズ

名前Advances in Experimental Medicine and Biology
1012
ISSN(印刷物)0065-2598
ISSN(電子版)2214-8019

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

これを引用

Hashimoto, K., & Ogawa, Y. (2018). Epigenetic switching and neonatal nutritional environment. : Advances in Experimental Medicine and Biology (pp. 19-25). (Advances in Experimental Medicine and Biology; 巻数 1012). Springer New York LLC. https://doi.org/10.1007/978-981-10-5526-3_3