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:
影响因子:
--
通讯作者:
Brasitus,TA
中科院分区:
文献类型:
--
作者:
Wali,RK;Baum,CL;Sitrin,MD;Brasitus,TA
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.
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DOI:
--
发表时间:
1987
期刊:
Journal of Steroid Biochemistry
影响因子:
--
作者:
A. Niendorf;H. Arps;M. Dietel
通讯作者:
M. Dietel
DOI:
--
发表时间:
1979
期刊:
Life Science
影响因子:
--
作者:
A. Norman;F. Ross
通讯作者:
F. Ross
影响因子:
7.8
作者:
R. Verbin;E. Farber
通讯作者:
E. Farber
影响因子:
11.2
作者:
Bernard Weinstein
通讯作者:
Bernard Weinstein
影响因子:
64.8
作者:
M. Kuno;P. Gardner
通讯作者:
P. Gardner