Unique cytochromes P450 in human brain: implication in disease pathogenesis.

Unique cytochromes P450 in human brain: implication in disease pathogenesis.
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人脑中独特的细胞色素 P450:对疾病发病机制的影响。

DOI:
10.1007/978-3-211-45295-0_26
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发表时间:
2006
期刊:
Journal of neural transmission. Supplementum
影响因子:
--
通讯作者:
Pai,HV
Pai,HV
中科院分区:
--
文献类型:
--
作者:
Ravindranath,V;Kommaddi,RP;Pai,HV

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细胞色素P450是血红素蛋白家族,其代谢包括药物在内的外源性物质。独特的人脑细胞色素P450酶通过与肝脏中已充分表征的生物转化途径不同的生物转化途径将包括药物在内的外源性物质代谢为活性/非活性代谢物。我们已经确定了一个可变剪接的功能转录的CYP 2D 7含有部分包含内含子6在人脑中,但不是在肝脏或肾脏从同一个人。基因分型显示,移码突变138 delT仅存在于表达脑变异CYP 2D 7的受试者中,CYP 2D 7将可待因专门代谢为吗啡,而不像肝CYP 2D 6将可待因代谢为可待因和吗啡。CYP 1A 1将多环芳烃生物活化为活性DNA结合代谢物并启动致癌作用。我们已经鉴定了CYP 1A 1的一种独特的剪接变体,其具有外显子6的87 bp缺失,其存在于人脑中,但不存在于同一个体的肝脏中。我们目前的证据表明,在人类大脑中存在的生物转化途径是不同的已知途径在肝脏。通过已知基因或尚未鉴定的基因的选择性剪接产生的新型CNS特异性P450酶的鉴定和表征可能有助于预测暴露于外源性物质(包括脑中的农药)的后果。
Cytochromes P450 is a family of heme proteins that metabolize xenobiotics including drugs. Unique human brain cytochrome P450 enzymes metabolize xenobiotics including drugs to active/inactive metabolites through biotransformation pathways that are different from the well-characterized ones in liver. We have identified an alternate spliced functional transcript of CYP2D7 containing partial inclusion of intron 6 in human brain but not in liver or kidney from the same individual. Genotyping revealed the presence of the frame-shift mutation 138delT only in those subjects who expressed the brain variant CYP2D7, which metabolizes codeine exclusively to morphine unlike hepatic CYP2D6 that metabolizes codeine to nor codeine and morphine. CYP1A1 bioactivates polycyclic aromatic hydrocarbons to reactive DNA binding metabolites and initiates carcinogenesis. We have identified a unique splice variant of CYP1A1 having deletion of 87 bp of exon 6 which is present in human brain but not in liver of the same individual. We present evidence for the existence of biotransformation pathways in human brain that are dissimilar from known pathways in liver. Identification and characterization of novel CNS-specific P450 enzymes generated by alternate splicing of known genes or as yet unidentified genes may help predict consequences of exposure to xenobiotics including pesticides in the brain.
DOI: 10.3109/10409238009105470
发表时间: 1980
期刊: --
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发表时间: 1975
期刊: Endocrinology
影响因子: 4.8
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