Vitamin D and intestinal calcium absorption.

Vitamin D and intestinal calcium absorption.
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DOI:
10.1016/j.mce.2011.05.038
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发表时间:
2011-12-05
影响因子:
4.1
通讯作者:
Seth, Tanya
Seth, Tanya
中科院分区:
医学2区
文献类型:
--
作者:
Christakos, Sylvia;Dhawan, Puneet;Porta, Angela;Mady, Leila J.;Seth, Tanya

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维生素D在钙稳态中的主要功能是增加肠道对钙的吸收。钙通过能量依赖性的主动跨细胞途径和通过紧密连接的被动细胞旁途径被吸收。1,25二羟基维生素D3(1,25(OH)2D3)是维生素D的代谢活性形式,通过其基因组作用,是主动肠钙吸收的主要刺激物,其涉及钙内流、钙通过肠上皮细胞内部的移位和通过肠质膜泵的钙的基底外侧排出。本文综述了近年来对维生素D介导的跨细胞钙吸收的传统模型提出挑战的研究以及特异性钙转运蛋白在肠道钙吸收中的关键作用。也有越来越多的证据表明,1,25(OH)2D3可以增强细胞旁钙扩散。本文还讨论了雌激素、催乳素、糖皮质激素和年龄对小肠钙吸收的影响以及远端小肠在维生素D介导的小肠钙吸收中的作用。
The principal function of vitamin D in calcium homeostasis is to increase calcium absorption from the intestine. Calcium is absorbed by both an active transcellular pathway, which is energy dependent, and by a passive paracellular pathway through tight junctions. 1,25Dihydroxyvitamin D3 (1,25(OH)2D3) the hormonally active form of vitamin D, through its genomic actions, is the major stimulator of active intestinal calcium absorption which involves calcium influx, translocation of calcium through the interior of the enterocyte and basolateral extrusion of calcium by the intestinal plasma membrane pump. This article reviews recent studies that have challenged the traditional model of vitamin D mediated transcellular calcium absorption and the crucial role of specific calcium transport proteins in intestinal calcium absorption. There is also increasing evidence that 1,25(OH)2D3 can enhance paracellular calcium diffusion. The influence of estrogen, prolactin, glucocorticoids and aging on intestinal calcium absorption and the role of the distal intestine in vitamin D mediated intestinal calcium absorption are also discussed.
DOI: 10.1210/en.2010-0033
发表时间: 2010-07-01
期刊: ENDOCRINOLOGY
影响因子: 4.8
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