Different phosphate transport in the duodenum and jejunum of chicken response to dietary phosphate adaptation.

Different phosphate transport in the duodenum and jejunum of chicken response to dietary phosphate adaptation.
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鸡十二指肠和空肠中不同磷酸盐转运对日粮磷酸盐适应的反应

DOI:
10.5713/ajas.2012.12187
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发表时间:
2012-10
期刊:
Asian-Australasian journal of animal sciences
影响因子:
--
通讯作者:
He J
He J
中科院分区:
其他
文献类型:
--
作者:
Fang R;Xiang Z;Cao M;He J

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小肠上皮细胞跨膜吸收磷酸盐主要由IIb型钠偶联磷酸盐协同转运蛋白(NaPi-IIb)介导,但其在鸡体内的表达和调控尚不清楚。在本研究中,我们研究了mRNA和蛋白质水平的NaPi-IIb在鸡小肠的三个区域,并将其表达水平与净磷吸收率。我们的研究结果表明,最大的磷酸盐吸收发生在空肠,但最高的表达水平的NaPi-IIb mRNA和蛋白发生在十二指肠。在响应低磷饮食(TP 0.2%),有一个适应性反应限制在十二指肠,刷状缘膜(BBM)的钠磷转运活性和NaPi-IIb蛋白和mRNA丰度增加。然而,当从低-(TP 0.2%)切换到正常饮食(TP 0.6%)4小时,有BBM NaPi-IIb蛋白丰度在空肠中的增加,但BBM NaPi-IIb mRNA没有变化。因此,我们的研究表明,钠磷转运活性和NaPi-IIb蛋白表达的差异调节,在十二指肠与空肠的鸡。
Intestinal phosphate (Pi) absorption across the apical membrane of small intestinal epithelial cells is mainly mediated by the type IIb Na-coupled phosphate co-transporter (NaPi-IIb), but its expression and regulation in the chicken remain unclear. In the present study, we investigated the mRNA and protein levels of NaPi-IIb in three regions of chicken small intestine, and related their expression levels to the rate of net phosphate absorption. Our results showed that maximal phosphate absorption occurs in the jejunum, however the highest expression levels of NaPi-IIb mRNA and protein occurs in the duodenum. In response to a low-Pi diet (TP 0.2%), there is an adaptive response restricted to the duodenum, with increased brush border membrane (BBM) Na-Pi transport activity and NaPi-IIb protein and mRNA abundance. However, when switched from a low- (TP 0.2%) to a normal diet (TP 0.6%) for 4 h, there is an increase in BBM NaPi-IIb protein abundance in the jejunum, but no changes in BBM NaPi-IIb mRNA. Therefore, our study indicates that Na-Pi transport activity and NaPi-IIb protein expression are differentially regulated in the duodenum vs the jejunum in the chicken.
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发表时间: 1999-10-01
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