Mouse Vitamin D-24-Hydroxylase: Molecular Cloning, Tissue Distribution, and Transcriptional Regulation by 1α,25-Dihydroxyvitamin D3.

Mouse Vitamin D-24-Hydroxylase: Molecular Cloning, Tissue Distribution, and Transcriptional Regulation by 1α,25-Dihydroxyvitamin D3.
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小鼠维生素 D-24-羟化酶:1α,25-二羟基维生素 D3 的分子克隆、组织分布和转录调节。

DOI:
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发表时间:
1997
期刊:
影响因子:
4.8
通讯作者:
N. Horiuchi
N. Horiuchi
中科院分区:
医学2区
文献类型:
--
作者:
N. Akeno;S. Saikatsu;T. Kawane;N. Horiuchi

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维生素D-24-羟化酶(24-OHase)是一种细胞色素P-450酶,可催化25-羟基维生素D3(25 OHD 3)和1α,25-二羟基维生素D3[1,25-(OH)2D 3]分别转化为24,25-二羟基维生素D3和1,24,25-三羟基维生素D3。小鼠24-OHase的全长互补DNA现已鉴定。互补DNA由3309 bp组成,编码514个氨基酸的蛋白质,分别与人和大鼠的酶显示82%和95%的序列同一性。注射1,25-(OH)2D 3(24 pmol/g)的小鼠组织的北方印迹分析显示,3.4 kb 24-OHase信使RNA(mRNA)在肾脏和肠中最丰富,在皮肤、胸腺和骨骼中存在少量。RT-PCR和Southern杂交检测24-OHase mRNA在其他几种组织,包括肺,睾丸,脾,胰腺,和心脏。腹腔注射1,25-(OH)2D 3可诱导小鼠肾脏24-OHase mRNA丰度和酶活性呈剂量和时间依赖性增加。
Vitamin D-24-hydroxylase (24-OHase) is a cytochrome P-450 enzyme that catalyzes the conversion of 25-hydroxyvitamin D3 (25OHD3) and 1α,25-dihydroxyvitamin D3[ 1,25-(OH)2D3] to 24,25-dihydroxyvitamin D3 and 1,24,25-trihydroxyvitamin D3, respectively. A full-length complementary DNA for mouse 24-OHase has now been characterized. The complementary DNA consists of 3309 bp and encodes a protein of 514 amino acids that shows 82% and 95% sequence identity with the human and rat enzymes, respectively. Northern blot analysis of tissues from mice injected with 1,25-(OH)2D3 (24 pmol/g) revealed that the 3.4-kb 24-OHase messenger RNA (mRNA) is most abundant in kidney and intestine, with smaller amounts present in skin, thymus, and bone. RT-PCR and Southern blot analysis detected 24-OHase mRNA in several other tissues including lung, testis, spleen, pancreas, and heart. Intraperitoneal injection of 1,25-(OH)2D3 induced dose- and time-dependent increases in both 24-OHase mRNA abundance and enzyme activity in mouse kidn...
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