1,25(OH)2 vitamin D3 stimulates membrane phosphoinositide turnover, activates protein kinase C, and increases cytosolic calcium in rat colonic epithelium.

1,25(OH)2 vitamin D3 stimulates membrane phosphoinositide turnover, activates protein kinase C, and increases cytosolic calcium in rat colonic epithelium.
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1,25(OH)2 维生素 D3 刺激膜磷酸肌醇周转,激活蛋白激酶 C,并增加大鼠结肠上皮中的胞质钙。

DOI:
10.1172/jci114567
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发表时间:
1990
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Brasitus,TA
Brasitus,TA
中科院分区:
--
文献类型:
--
作者:
Wali,RK;Baum,CL;Sitrin,MD;Brasitus,TA

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维生素 D 的激素形式,即 1,25(OH)2 维生素 D3 [1,25(OH)2D3],可调节结肠钙吸收以及结肠细胞增殖和分化。在本研究中,我们研究了 1,25(OH)2D3 对离体大鼠结肠上皮膜磷酸肌醇周转、蛋白激酶 C 激活和细胞内钙浓度 [( Ca+2]i) 调节的影响。 1,25(OH)2D3 以浓度依赖性方式在 15 秒内刺激膜磷酸肌醇的分解,生成二酰基甘油和肌醇 1,4,5-三磷酸 (IP3)。 1,25(OH)2D3 快速激活结肠蛋白激酶 C,在暴露于 secosteroid 后 1 分钟内,活性从胞质溶胶到膜的最大转移发生。使用荧光染料 fura-2 在分离的结肠细胞中进行的研究表明,10(-8) M 1,25(OH)2D3 导致 [Ca+2]i 快速上升,然后短暂下降,然后上升到新的平台值。当这些实验在无钙缓冲液中进行时,观察到 [Ca+2]i 增加,但瞬时和继发性增加的幅度均减小,表明 1,25(OH)2D3 可能刺激细胞内钙储存的释放和钙流入。体内注射 4 小时后,1,25(OH)2D3 刺激大鼠结肠细胞中的 [3H]胸苷摄取。这些研究表明 1,25(OH)2D3 对膜磷酸肌醇代谢产生快速影响,这可能介导开甾类固醇对结肠细胞钙转运和增殖的某些影响。
The hormonal form of vitamin D, 1,25(OH)2 vitamin D3 [1,25(OH)2D3], regulates colonic calcium absorption and colonocyte proliferation and differentiation. In this study, we have examined the effect of 1,25(OH)2D3 on membrane phosphoinositide turnover, protein kinase C activation, and regulation of intracellular calcium concentration [( Ca+2]i) in isolated rat colonic epithelium. In a concentration-dependent manner, 1,25(OH)2D3 stimulated breakdown of membrane phosphoinositides within 15 s, generating diacylglycerol and inositol 1,4,5-triphosphate (IP3). 1,25(OH)2D3 rapidly activated colonic protein kinase C, with maximal translocation of activity from the cytosol to the membrane occurring within 1 min of exposure to the secosteroid. Studies performed in isolated colonocytes with the fluorescent dye fura-2 demonstrated that 10(-8) M 1,25(OH)2D3 caused a rapid rise in [Ca+2]i which then transiently decreased before rising to a new plateau value. When these experiments were performed in a calcium-free buffer, an increase in [Ca+2]i was observed, but both the transient and secondary rise were diminished in magnitude, suggesting that 1,25(OH)2D3 may stimulate both release of intracellular calcium stores and calcium influx. 1,25(OH)2D3 stimulated [3H]thymidine uptake in rat colonocytes, 4 h after an in vivo injection. These studies indicate that 1,25(OH)2D3 exerts a rapid influence on membrane phosphoinositide metabolism which may mediate certain of the secosteroid's effects on colonocyte calcium transport and proliferation.
1,25-二羟基维生素 D3 对体外人类癌细胞的影响。
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影响因子: --
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DOI: --
发表时间: 1987
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影响因子: 64.8
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