論文

査読有り 国際誌
2020年4月

High-fat diets provoke phosphorus absorption from the small intestine in rats.

Nutrition (Burbank, Los Angeles County, Calif.)
  • Keisuke Kawamoto
  • ,
  • Masae Sakuma
  • ,
  • Sarasa Tanaka
  • ,
  • Masashi Masuda
  • ,
  • Mari Nakao-Muraoka
  • ,
  • Yuki Niida
  • ,
  • Yurino Nakamatsu
  • ,
  • Mikiko Ito
  • ,
  • Yutaka Taketani
  • ,
  • Hidekazu Arai

72
開始ページ
110694
終了ページ
110694
記述言語
英語
掲載種別
DOI
10.1016/j.nut.2019.110694

OBJECTIVE: The ratio of dietary carbohydrate to fat may affect phosphorus metabolism because both calcium and phosphorus are regulated by similar metabolic mechanisms, and a high-fat diet (HFD) induces deleterious effects on the absorption of dietary calcium. We hypothesized that an HFD induces an increase in phosphorus absorption. The aim of this study was to evaluate the effects of differences in the quantity and quality of dietary fat on phosphorus metabolism over the short- and long-term. METHODS: Eighteen 8-wk-old Sprague-Dawley male rats were fed an isocaloric diet containing varied ratios of carbohydrates to fat energy and sources of fat (control diet, HFD, and high- saturated fat diet [HF-SFA]). At 3 d and 7 wk after the allocation and initiation of the test diets, feces and urine were collected and used for phosphorus and calcium measurement. RESULTS: The fecal phosphorous concentration (F-Pi) was lower in the HF-SFA group than in the other two groups; however, the urine phosphorus concentration (U-Pi) was significantly higher in the HF-SFA group than the other two groups when the rats were fed over the short- (P < 0.01) and long -term (P < 0.01 versus control, P < 0.05 versus HFD group). There were no significant differences in type-IIa sodium-phosphate cotransporter (NaPi-2 a) and type-IIc sodium-phosphate cotransporter (NaPi-2 c) mRNA expression, which are renal phosphate transport-related genes; however, the expression of type-IIb sodium-phosphate cotransporter (NaPi-2 b) and type-III sodium-phosphate cotransporter (Pit-1) mRNA in the duodenum was higher in the HFD and HF-SFA groups than in the control group (P < 0.05), although there were no significant differences in these in the jejunum. CONCLUSIONS: The present results indicated that an HFD, particularly HF-SFA, increases intestinal phosphate absorption compared with control.

リンク情報
DOI
https://doi.org/10.1016/j.nut.2019.110694
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/32007805