Abnormal regulation of renal vitamin D catabolism by dietary phosphate in murine X-linked hypophosphatemic rickets.
Abnormal regulation of renal vitamin D catabolism by dietary phosphate in murine X-linked hypophosphatemic rickets.
复制标题
小鼠 X 连锁低磷血症性佝偻病中膳食磷酸盐对肾脏维生素 D 分解代谢的异常调节。
DOI:
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发表时间:
1990
影响因子:
15.9
通讯作者:
G. Jones
中科院分区:
文献类型:
--
作者:
H. Tenenhouse;G. Jones
Hyp mice exhibit increased renal catabolism of vitamin D metabolites by the C-24 oxidation pathway (1988. J. Clin. Invest. 81:461-465). To examine the regulatory influence of dietary phosphate on the renal vitamin D catabolic pathway in Hyp mice, we measured C-24 oxidation of 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) in renal mitochondria isolated from Hyp mice and normal littermates fed diets containing 0.03% (low-Pi), 1% (control-Pi), and 1.6% (high-Pi) phosphate. In normal mice the low-Pi diet led to a rise in serum 1,25(OH)2D (22.2 +/- 1.8 to 48.1 +/- 6.8 pg/ml, P less than 0.05) and no change in C-24 oxidation products (0.053 +/- 0.006 to 0.066 +/- 0.008 pmol/mg protein per min) when compared with the control diet. In Hyp mice the low-Pi diet elicited a fall in serum 1,25(OH)2D (21.9 +/- 1.2 to 8.0 +/- 0.2 pg/ml, P less than 0.05) and a dramatic increase in C-24 oxidation products (0.120 +/- 0.017 to 0.526 +/- 0.053 pmol/mg protein per min, P less than 0.05) when compared with the control diet. The high-Pi diet did not significantly alter serum levels of 1,25(OH)2D or C-24 oxidation products in normal mice. Hyp mice on the high-Pi diet experienced a rise in serum 1,25(OH)2D (21.9 +/- 1.2 to 40.4 +/- 7.3, P less than 0.05) and a fall in C-24 oxidation products (0.120 +/- 0.017 to 0.043 +/- 0.007 pmol/mg protein per min, P less than 0.05). The present results demonstrate that the defect in C-24 oxidation of 1,25(OH)2D3 in Hyp mice is exacerbated by phosphate depletion and corrected by phosphate supplementation. The data suggest that the disorder in vitamin D metabolism in the mutant strain is secondary to the perturbation in phosphate homeostasis.
DOI:
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发表时间:
1983
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Gray,RW;Napoli,JL
通讯作者:
Napoli,JL
影响因子:
4.8
作者:
MeyerJr,RA;Gray,RW;Meyer,MH
通讯作者:
Meyer,MH
DOI:
10.1172/jci112274
发表时间:
1986
期刊:
The Journal of clinical investigation
影响因子:
--
作者:
Nesbitt,T;Drezner,MK;Lobaugh,B
通讯作者:
Lobaugh,B