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Dietary Fructooligosaccharides Change the Concentration of Calbindin-D9k Differently in the Mucosa of the Small and Large Intestine of Rats

Manuscript received 27 October 1997. Initial reviews completed 24 November 1997. Revision accepted 4 February 1998.

Atsutane Ohta, Yasuko Motohashi*, Masako Ohtsuki, Masao Hirayama, Takashi Adachi, and Keiko Sakuma*

Nutritional Science Center, Bioscience Laboratories, Meiji Seika Kaisha, Saitama 350-0289, Japan and * Department of Molecular Nutrition, Faculty of Nutritional Science, Kagawa Nutrition University, Saitama 350-0288, Japan

Previously, we confirmed that dietary fructooligosaccharides (FOS) increase calcium absorption in rats. In this study, we examined the influence of FOS feeding on the concentration of calbindin-D9k of several intestinal segments in rats. Rats in the control group were fed a diet without FOS. Rats in the other two groups were fed the diet containing FOS at either 50 or 100 g/kg for 10 d and subjected to a calcium absorption study. On the final day of feeding, the rats were killed and the entire intestine was removed. The intestinal mucosa was collected from four segments, i.e., the proximal and distal segments of the small intestine, the cecum and the colorectum, respectively. The apparent absorption of calcium increased dose dependently (r = 0.9256, P < 0.0001). Significant positive correlations between apparent calcium absorption and the relative amounts of calbindin in both large intestinal segments were observed (cecum, r = 0.8956, P = 0.0011; colorectum, r = 0.8828, P = 0.0016). Also, significant negative correlations between apparent calcium absorption and the relative amounts of calbindin-D9k in both small intestinal segments were observed (proximal, r = -0.7149, P = 0.0304; distal, r = -0.8740, P = 0.0021). In conclusion, FOS feeding increases levels of calbindin-D9k in the large intestine, but decreases those in the small intestine. Moreover, these results suggest that part of the stimulatory effect of fructooligosaccharides relates to the transcellular route of calcium absorption in the large intestine of rats.

Key words: fructooligosaccharides, calcium binding protein, calcium, absorption, rats.

The Journal of Nutrition Vol. 128 No. 6 June 1998, pp. 934-939
Copyright ©1998 by the American Society for Nutritional Sciences




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