Manganese source affects manganese transport and gene expression of divalent metal transporter 1 in the small intestine of broilers

文献类型： 外文期刊

第一作者： Bai, Shi-Ping

作者： Bai, Shi-Ping;Lu, Lin;Wang, Rui-Lian;Zhang, Li-Yang;Luo, Xu-Gang;Bai, Shi-Ping;Lu, Lin;Zhang, Li-Yang;Luo, Xu-Gang;Xi, Lin

作者机构：

关键词： Organic manganese transport;Divalent metal transporter;Gene expression;Small-intestinal loops;Broilers

期刊名称：BRITISH JOURNAL OF NUTRITION （ 影响因子：3.718； 五年影响因子：4.816 ）

ISSN： 0007-1145

年卷期： 2012 年 108 卷 2 期

页码：

收录情况： SCI

摘要： In the present study, two experiments were conducted to investigate the effect of Mn source on Mn transport and the expression of a Mn transporter, divalent metal transporter 1 (DMT1), in the small intestine of broilers. In Expt 1, in situ ligated duodenal loops from Mn-deficient chicks (29-d-old) were perfused with solutions containing 0-8.74 mmol Mn/l from either MnSO4, or one of two organic chelates of Mn and amino acids with moderate (OM) or strong (OS) chelation strength (Q(f)) up to 30 min. In Expt 2, Mn-deficient intact broilers (14-d-old) were fed a control diet (12.45 mg Mn/kg) or the control diet supplemented with 100mg Mn/kg as one of all Mn sources for 14 d. The uptake kinetics of Mn from different Mn sources in the ligated duodenal loops followed a saturable process as determined by regression analysis of concentration-dependent uptake rates. The maximum transport rate (J(max)) and K-m values, and DMT1 mRNA levels in the ligated duodenal loops were higher (P<0.01) for OM and OS than for MnSO4. DMT1 mRNA levels were much higher (P<0.01) in the duodenum than in the jejunum and ileum. Both DMT1 mRNA levels in the duodenum and plasma Mn contents from the hepatic portal vein of intact chicks on day 14 post-feeding increased (P<0.05) in the following order: control, MnSO4, OM, OS. These results indicated that organic Mn sources with stronger Q(f) showed higher Mn transport and absorption, and DMT1 might be involved in the regulation of organic Mn transport in the proximal small intestine of broilers.

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