Expression of calbindin-D9k, VDR and Cdx-2 messenger RNA in the process by which fructooligosaccharides increase calcium absorption in rats

Journal of Nutritional Science and Vitaminology
Akiko FukushimaKeiko Sakuma

Abstract

We have previously shown, through evidence that the expression of calbindin-D9k protein shows a dose-dependent change in the intestine, that calbindin-D9k plays a role in the ability of a fructooligosaccharide (FOS) diet to increase calcium absorption. This study shows that the regulation of calbindin-D9k expression occurs at the transcriptional level in a segment-specific manner, decreasing in the proximal intestine and increasing in the colorectal segment. To determine the transcriptional regulation of the FOS diet on calbindin-D9k expression, two transcription factors, vitamin D receptor (VDR) and cdx-2, were analyzed during 10 d feeding of the FOS diet. The mRNA expression of VDR and cdx-2 was influenced by the FOS diet and showed a segment-specific change. In the proximal small intestine, there was a significant correlation between the changes in both mRNAs (r = 0.69, p < 0.01), while the expression of calbindin-D9k correlated neither with VDR nor with cdx-2. This means that the transcriptional change induced by the FOS diet was not regulated by VDR and cdx-2. In the colorectal segment, there were significant correlations between gene expressions of calbindin-D9k vs. VDR, r = 0.73, p < 0.01 and calbindin-D9k vs. cdx-2, r =...Continue Reading

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