Dietary Sucrose Enhances Intestinal Lactase Gene Expression in Euthyroid Rats
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概要
- 論文の詳細を見る
It is postulated that dietary carbohydrates and thyroid hormones are major regulators for expression of the lactase/phlorizin hydrolase (LPH) gene in rat jejunum. In this study, we investigated the effects of thyroid hormones and dietary sucrose on LPH gene expression and lactase activity in starved rats. Firstly, animals at 8 wk of age were fed a lowstarch diet (5.5% energy as cornstarch) or high-starch diet (71% energy as cornstarch) for 7 d (experiment 1). The mRNA level of LPH as well as lactase activity significantly decreased in rats fed the low-starch diet as compared to those fed the high-starch diet. To investigate the effects of thyroid hormone status, the animals previously fed the low-starch diet were starved for 3 d, and half of the animals were given intraperitoneal (i.p.) injections of 20μg/100 g body weight triiodothyronine (T_3) twice daily (experiment 2). The LPH mRNA level and lactase activity were elevated by starvation for 3 d, but they were repressed by the injection of T_3 during starvation. To investigate the effects of dietary sucrose in starved rats, they were force-fed a sucrose diet for 6 h (experiment 3). The LPH gene expression and lactase activity were up-regulated by force-feeding a sucrose diet, only when the animals were kept in euthyroid status by daily T_3 administrations. In contrast, the sucrase-isomaltase mRNA levels and sucrase activity were unaffected by force-feeding the sucrose diet for both T_3-treated and untreated starved rats. Our work suggests that dietary sucrose is capable of enhancing lactase gene expression in starved rats when they have a sustainable thyroid hormone level.
- 日本ビタミン学会の論文
著者
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Goda Toshinao
Lab. Of Nutritional Physiology Graduate School Of Nutritional And Environmental Sciences And Global
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Goda Toshinao
Laboratory Of Nutritional Physiology Graduate School Of Nutritional And Environmental Sciences And G
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Goda Toshinao
School Of Food And Nutritional Sciences University Of Shizuoka
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Mochizuki Kazuki
Laboratory Of Nutritional Physiology Graduate School Of Nutritional And Environmental Sciences And G
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Mochizuki Kazuki
School Of Food And Nutritional Sciences The University Of Shizuoka
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KURANUKI Sachi
School of Food and Nutritional Sciences, The University of Shizuoka
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Kuranuki Sachi
School Of Food And Nutritional Sciences The University Of Shizuoka
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