期刊名称：Journal of Nutritional Science and Vitaminology
印刷版ISSN：0301-4800
电子版ISSN：1881-7742
出版年度：2005
卷号：51
期号：2
页码：118-123
DOI：10.3177/jnsv.51.118
出版社：Center for Academic Publications Japan
摘要：The effect of fasting on mouse liver methionine adenosyltransferase (MAT I/III) expression and the regulation of methionine metabolism were investigated. The mRNA level, protein level, and activity of MAT I/III were increased by fasting for 10 or 16h. In spite of the increase of MAT I/III activity, S -adenosylmethionine, the product of methionine due to MAT I/III, decreased. S -Adenosylhomocysteine, which is made from S -adenosylmethionine by its coupling to methyltransferase, increased as a result of fasting for 16h. These results suggest that the total methylation reactions using S -adenosylmethionine are stimulated in the fasting mouse liver. However, the DNA methylation level was not changed by fasting for 16h. Glutathione, which is made by the transsulfuration pathway from homocysteine, decreased due to fasting. Regulation of supplementation of S -adenosylmethionine may occur in the fasting mouse because MAT I/III activity increases and the flow to glutathione is decreased.
