1,25-Dihydroxycholecalciferol-dependent calcium uptake by mouse mammary gland in culture.

1,25-Dihydroxycholecalciferol-dependent calcium uptake by mouse mammary gland in culture.
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培养物中小鼠乳腺对 1,25-二羟基胆钙化醇依赖性钙的吸收。

DOI:
10.1210/endo-122-2-389
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发表时间:
1988
期刊:
影响因子:
4.8
通讯作者:
M. Moruzzi
M. Moruzzi
中科院分区:
医学2区
文献类型:
--
作者:
G. Mezzetti;M. G. Monti;L. Casolo;G. Piccinini;M. Moruzzi

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在催乳激素存在下培养的孕鼠乳腺外植体通过在体外产生乳汁成分来表达其分化功能。在本文件中,放射性钙的摄取研究在乳腺终末分化,当泌乳开始。在这些条件下,可清楚地证明组织中钙的相关蓄积。我们的特点是钙的吸收组织作为一个饱和和能量依赖性的过程。当1,25-二羟基胆钙化醇[1,25-(OH)2D 3],主要的钙调节激素,被添加到孵育培养基中的开环甾类强烈刺激这一过程,增加最大速度,而不显着改变米氏常数(Km)。在外植体用1,25-(OH)2D 3培养30分钟后,可以测量到钙吸收的可检测增加,随着时间的推移,反应继续急剧增加,并在3小时达到平台。增加不受放线菌素D或放线菌酮的存在下,表明1,25-(OH)2D 3刺激钙摄取可能是独立的从头蛋白质合成。这些结果提供了证据,早期和直接作用的激素形式的维生素D在影响钙转运跨膜的功能分化的上皮细胞的乳腺。
Mammary explants from pregnant mice cultured in the presence of lactogenic hormones express their differentiated function by producing milk components in vitro. In the present paper radioactive calcium uptake was studied in the mammary gland during terminal differentiation, when lactogenesis was initiated. Under these conditions a relevant accumulation of calcium in the tissue was clearly demonstrable. We have characterized the calcium uptake by the tissue as a saturable and energy dependent process. When 1,25-dihydroxycholecalciferol [1,25-(OH)2D3], the major calcium regulator hormone, was added to the incubation medium the secosteroid strongly stimulated this process by increasing the maximal velocity without significantly altering the Michaelis Menten constant (Km). Detectable increases in calcium uptake could be measured after the explants were cultured with 1,25-(OH)2D3 for 30 min, with the response continuing to increase sharply over time and reaching a plateau at 3 h. The increase was not affected by the presence of actinomycin D or cycloheximide suggesting that the 1,25-(OH)2D3 stimulation of calcium uptake may be independent of de novo protein synthesis. These results provide evidence for early and direct action of the hormonal form of vitamin D in affecting calcium transport across membranes of functionally differentiated epithelial cells of the mammary gland.
培养胚胎鸡十二指肠中 1,25-二羟基维生素 D3 依赖性钙吸收的表征。
DOI: --
发表时间: 1981
期刊: The Journal of biological chemistry
影响因子: --
作者:
Franceschi,RT;DeLuca,HF
通讯作者: DeLuca,HF
维生素 D 状态和刷状缘膜囊泡:1,25-二羟基维生素 D3 诱导不稳定。
DOI: 10.1002/jbmr.5650010402
发表时间: 1986
期刊: Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research
影响因子: --
作者:
Putkey,JA;Nemere,I;Norman,AW
通讯作者: Norman,AW
正常雏鸡灌注十二指肠中的钙转运:接触 1,25-二羟基维生素 D3 后 14 分钟内增强。
DOI: 10.1210/endo-115-4-1476
发表时间: 1984
期刊: Endocrinology
影响因子: 4.8
作者:
Nemere,I;Yoshimoto,Y;Norman,AW
通讯作者: Norman,AW
钙转运蛋白、钙吸收和维生素 D。
DOI: 10.1146/annurev.ph.45.030183.002111
发表时间: 1983
影响因子: 18.2
作者:
Wasserman,RH;Fullmer,CS
通讯作者: Fullmer,CS