Unidirectional duodenal and jejunal calcium and phosphorus transport in the rat: Effects of dietary phosphorus depletion, ethane-1-hydroxy-1,1-diphosphonate and 1,25 dihydroxycholecalciferol

Unidirectional duodenal and jejunal calcium and phosphorus transport in the rat: Effects of dietary phosphorus depletion, ethane-1-hydroxy-1,1-diphosphonate and 1,25 dihydroxycholecalciferol
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大鼠单向十二指肠和空肠钙磷转运:膳食磷消耗、乙烷-1-羟基-1,1-二膦酸酯和 1,25 二羟基胆钙化醇的影响

DOI:
10.1007/bf01855011
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发表时间:
1989
期刊:
Research in Experimental Medicine
影响因子:
--
通讯作者:
Ulrich Binswanger
Ulrich Binswanger
中科院分区:
--
文献类型:
--
作者:
H. Jungbluth;Ulrich Binswanger

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摘要 在粘膜和浆膜缓冲介质之间不存在电化学梯度的情况下,通过改进的 Ussing 技术在体外研究了单向钙 (Ca) 和磷 (Pi) 转运。在单独 Pi 消耗(0.03% 饮食 Pi)、Pi 消耗和 EHDP 治疗(每天 40 mg/kg,皮下 × 4)以及 Pi 消耗、EHDP 和 1,25(OH)2D3(500 pmol i.v. × 2)治疗后,对雄性白化 ​​Sprague-Dawley 大鼠的十二指肠和空肠进行了研究。粘膜到浆膜的 Ca 和 Pi 通量 (Jms) 平行变化,具体取决于动物的 1,25(OH)2D3 状态。关于浆膜至粘膜通量 (Jsm),Pi 消耗导致 Ca 和 Pi 的 Jsm 增加,与十二指肠中 Gt 和 Isc 的增加相关,但与空肠中无关。给予 EHDP 阻断 1,25(OH)2D3 的合成,导致十二指肠 Jsm 中钙的进一步增加,但磷的含量没有增加,同时 Gt 和 Isc 也增加。充满1,25(OH)2D3后,在十二指肠和空肠中观察到Ca和Pi的Jsm增加以及Gt和Isc增加。 Ca 和 Pi 的浆膜至粘膜通量与十二指肠(分别为 r = 0.89,P < 0.001 和 r = 0.84;P < 0.001)以及空肠(分别为 r = 0.55;P < 0.01 和 r = 0.66;P < 0.001)中的组织电导(Gt)相关。 Jsm 的变化也与跨壁短路电流 (Isc) 的变化同时发生。这些数据与 Ca 和 Pi 的 Jsm 增加以及 Gt 增加的假设相一致,两者都反映了钠吸收增加导致的通过紧密连接的水循环增加。他们提供了进一步的证据,证明 1,25(OH)2D3 对肠道 Ca 和 Pi 转运的总体影响是增加细胞介导的主动粘膜至浆膜转运和细胞旁扩散浆膜至粘膜离子运动。
SummaryUnidirectional calcium (Ca) and phosphorus (Pi) transport was studied in vitro by means of a modified Ussing technique in the absence of electrochemical gradients between the mucosal and serosal buffer medium. Duodenum and jejunum of male albino Sprague-Dawley rats were investigated after Pi depletion alone (0.03% diet-Pi), Pi depletion and EHDP treatment (40 mg/kg per day s.c. × 4), and Pi depletion, EHDP and 1,25(OH)2D3 (500 pmol i.v. × 2) treatment. Mucosal-to-serosal Ca and Pi fluxes (Jms) changed in parallel, depending on the 1,25(OH)2D3-status of the animals. Regarding serosal-to-mucosal fluxes (Jsm), Pi depletion resulted in an increase in Jsm for Ca and Pi, associated with a rise in Gt and Isc in the duodenum but not in the jejunum. EHDP administered to block synthesis of 1,25(OH)2D3 caused further augmentation in duodenal Jsm for calcium but not phosphorus, which was paralleled by an increase in Gt and Isc. After repletion with 1,25(OH)2D3, an increase in Jsm for Ca and Pi and a rise in Gt and Isc were observed in the duodenum and in the jejunum. Serosal-to-mucosal fluxes for Ca and Pi were related to tissue conductance (Gt) in the duodenum (r = 0.89,P < 0.001 andr = 0.84;P < 0.001, respectively), as well as in the jejunum (r = 0.55;P < 0.01 andr = 0.66;P < 0.001, respectively). Changes in Jsm also paralleled changes in transmural shortcircuit current (Isc). The data are compatible with the assumption of an increase in Jsm for Ca and Pi and a rise in Gt, both reflecting an increase in water recycling across the tight junctions caused by a rise in sodium absorption. They provide further evidence that the overall effect of 1,25(OH)2D3 on intestinal Ca and Pi transport is to increase both cell-mediated active mucosal-to-serosal transport and paracellular diffusional serosal-to-mucosal ion movement.
大鼠结肠中钙和无机磷酸盐的转运:对 1,25-二羟基维生素 D3 的解离反应。
DOI: 10.1172/jci109796
发表时间: 1980
期刊: The Journal of clinical investigation
影响因子: --
作者:
Lee,DB;Walling,MW;Gafter,U;Silis,V;Coburn,JW
通讯作者: Coburn,JW
DOI: 10.1152/ajpgi.1986.250.3.g369
发表时间: 1986-03
期刊: The American journal of physiology
影响因子: --
作者:
D. B. Lee;M. Walling;N. Brautbar
通讯作者: D. B. Lee;M. Walling;N. Brautbar
磷酸盐跨大鼠空肠转运:钠、pH 和 1,25-二羟基维生素 D3 的影响。
DOI: 10.1152/ajpgi.1986.251.1.g90
发表时间: 1986
期刊: The American journal of physiology
影响因子: --
作者:
Lee,DB;Walling,MW;Corry,DB
通讯作者: Corry,DB