Effect of Schiff base formation on the function of the calcitriol receptor.

Effect of Schiff base formation on the function of the calcitriol receptor.
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席夫碱形成对骨化三醇受体功能的影响。

DOI:
10.1038/ki.1996.469
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发表时间:
1996
影响因子:
19.6
通讯作者:
C. Hsu
C. Hsu
中科院分区:
医学1区
文献类型:
--
作者:
S. Patel;R. Koenig;C. Hsu

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骨化三醇的基因组作用是通过骨化三醇受体 (VDR) 与目标基因的维生素 D 反应元件 (VDRE) 的相互作用介导的。我们已经证明,VDR 与 VDRE 的相互作用受到尿毒症毒素的抑制。我们假设尿毒症毒素与 VDR DNA 结合域的赖氨酸残基形成席夫碱,并抑制 VDR 与 VDRE 相互作用。在这项研究中,5'-磷酸吡哆醛被用作探针来测试席夫碱形成的抑制机制,因为它与类固醇受体形成席夫碱。吡哆醛 5'-磷酸抑制 VDR 与 VDRE 的结合,并在体外对 VDR 的 DNA 结合域进行化学修饰。当吡哆醛 5'-磷酸与赖氨酸预孵育时,抑制作用被逆转。此外,这种化学试剂还阻断了在用连接有CAT报告基因的构建的VDRE转染的细胞中由骨化三醇诱导的氯霉素乙酰转移酶(CAT)的产生。这一发现与 5'-磷酸吡哆醛可与 VDR 相互作用并削弱其在细胞内 DNA 结合的假设是一致的。由于24-羟化酶合成的诱导是受体介导的过程,因此我们研究了吡哆醛5'-磷酸对大鼠肾24-羟化酶合成的影响。当将5'-磷酸吡哆醛输注给大鼠时,肾24-羟化酶活性受到抑制,因此这些动物中骨化三醇的降解也减少。因此,能够形成希夫碱的化学物质可能会改变 VDR 和骨化三醇的生理功能。
The genomic action of calcitriol is mediated through the interaction of the calcitriol receptor (VDR) with vitamin D response elements (VDREs) of the target genes. We have shown that the interaction of VDRs with VDREs is inhibited by uremic toxins. We hypothesize that uremic toxins form Schiff bases with the lysine residues of the VDR DNA binding domain and inhibit the VDR interaction with the VDRE. In this study, pyridoxal 5'-phosphate was used as a probe to test Schiff base formation as the inhibitory mechanism, since it forms Schiff bases with steroid receptors. Pyridoxal 5'-phosphate inhibited the VDR binding to the VDREs and chemically modified the DNA binding domain of the VDR in vitro. The inhibition was reversed when pyridoxal 5'-phosphate was preincubated with lysine. Further, this chemical agent also blocked the production of chloramphenicol acetyltransferase (CAT) enzyme induced by calcitriol in cells transfected with a constructed VDRE attached to a CAT reporter gene. This finding is consistent with the hypothesis that pyridoxal 5'-phosphate could interact with the VDR and impair its DNA binding within cells. Since induction of 24-hydroxylase synthesis is a receptor mediated process, we studied the effect of pyridoxal 5'-phosphate on the synthesis of renal 24-hydroxylase in rats. When pyridoxal 5'-phosphate was infused to rats, renal 24-hydroxylase activity was suppressed, consequently, degradation of calcitriol was also reduced in these animals. Thus, chemicals capable of Schiff base formation potentially could alter the physiological function of VDR and calcitriol.
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发表时间: 1992
期刊: Molecular endocrinology (Baltimore, Md.)
影响因子: --
作者:
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发表时间: 1981
影响因子: 3.1
作者:
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DOI: 10.1016/0003-9861(86)90712-5
发表时间: 1986
影响因子: 3.9
作者:
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通讯作者: Feldman,D
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DOI: --
发表时间: 1986
期刊: Clinical chemistry
影响因子: 9.3
作者:
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通讯作者: Hollis,BW