高效液相色谱法快速检测单胺类神经递质及其代谢产物(英文)

Rapid determination of monoamine neurotransmitters and their metabolites by high performance liquid chromatography

背景:单胺类神经递质及其代谢产物对实验研究帕金森病和实验诊断嗜铬细胞瘤具有重要意义,是当今的研究热点。目的:建立高效液相色谱法同时快速测定肾上腺素、去甲肾上腺素、多巴胺、5-羟色胺、5-羟吲哚乙酸、高香草酸及多巴柯7种单胺类神经递质及其代谢产物。设计:病例-对照观察和随机对照动物实验。单位:青岛大学医学院附属医院检验科及青岛大学医学院附属医院海阳分院。对象:实验于2003-10/12在青岛大学医学院生理教研室和青岛大学医学院附属医院检验科完成。①2例嗜铬细胞瘤患者,均经CT,MRI或病理切片和临床证实为该病。12例正常对照均为在校大学生,且经查排除高血压、内分泌系统疾病和其他疾病。②选用健康雌性Wistar大白鼠12只,体质量150～180g。随机数字表法分为2组,正常对照组和帕金森病组,每组大鼠各6只。方法:制备7种物质样品(肾上腺素、去甲肾上腺素、多巴胺、5-羟色胺、5-羟吲哚乙酸、高香草酸及多巴柯)的标准色谱图,同时进行样品精密度和回收率的检测。采用高效液相色谱法检测12例正常对照和2例嗜铬细胞瘤患者24h尿中的儿茶酚胺类物质。同时以6-羟基多巴胺损毁帕金森病组大鼠大脑一侧前脑束,以监测正常和帕金森病大鼠健侧及损毁侧尾壳核区纹状体内单胺类神经递质及其代谢产物的释放特点。主要观察指标:①样品精密度和回收率检测结果。②12例正常对照和2例嗜铬细胞瘤患者24h尿中儿茶酚胺类物质的测定结果。③各组大鼠纹状体内单胺类神经递质及其代谢产物的释放特点。结果:12例正常对照和2例嗜铬细胞瘤患者均获得24h尿中儿茶酚胺类物质检测结果,并进入结果分析。实验动物在实验中无死亡。①高效液相色谱法对肾上腺素、去甲肾上腺素、多巴胺、5-羟色胺、5-羟吲哚乙酸、高香草酸及多巴柯7种单胺类物质的线性范围为2～1000μg/L,最低检测限为2～30μg/L,批内精密度为3.0%～8.6%,批间精密度为3.8%～9.7%。多巴胺的平均回收率为107.3%、去甲肾上腺素为89.4%、肾上腺素为80.1%,其余4种物质为89.2%～95.7%。②2例嗜铬细胞瘤患者24h尿中儿茶酚胺类物质的含量显著高于正常人,其中1例以肾上腺素明显增高为主,另1例以去甲肾上腺素明显增高为主,均高于正常人10倍左右。③帕金森病大鼠健侧尾壳核内多巴胺及其代谢产物多巴柯、高香草酸含量均在正常范围内,损毁侧尾壳核内多巴胺、5-羟色胺、多巴柯及高香草酸均显著降低,差异有显著性意义(P<0.01);5-羟色胺及其代谢产物5-羟吲哚乙酸含量无明显改变。④帕金森病大鼠健侧尾壳核内多巴胺更新率(多巴柯/多巴胺和高香草酸/多巴胺的比值)升高;损毁侧尾壳核内多巴胺更新速度也加快,与正常对照组比较差异均有显著性意义(P<0.05)。结论:高效液相色谱法能满足对大白鼠帕金森病模型的研究和对嗜铬细胞瘤患者实验诊断的需要。

BACKGROUND： The determination of monoamine neurotransmitters and their metabolites is important in the experimental.research of Parkinson disease （PD） and experimental diagnosis of phaochromocytoma.OBJECTIVE： To develop a high performance liquid chromatography （HPLC） method for simultaneous and rapid determination of monoamine neurotransmitters and their metabolites which include epinephrine（E）, norepinephrine（NE）, dopamine（DA）, 5＇-hydroxytryptamine（5＇-HT）, 5-hydroxy3-indoleacetic acid（5-HIAA）, homovanillic acid（HVA） and 3,4-dihydroxyphenylacetic acid（DOPAC）.DESIGN： Case control observation and a randomized controlled animal experiment.SETTING： Department of Clinical Laboratory, Affiliated Hospital of Medical College, Qingdao University; Haiyang Branch, Affiliated Hospital of Medical College, Qingdao University.PARTICIPANTS： This experiment was carried out at Staff Room of Physiology, edical College, Qingdao University and Department of Clinical Laboratory, Affiliated Hospital of Medical College of Qingdao University from October to December 2003. ①Two patients with phaeochromocytoma were all confirmed by CT, MRI or pathologic section as well as physical sign. Twelve health volunteers were all university students and were excluded to suffer hypertension, endocrine system diseases and other diseases. ② Total 12 healthy female Wister rats weighed between 150 g to 180 g were chosen and randomly divided into control group and PD group with 6 rats in each.METHODS： The standard chromatograms of the standard solution of mixtures of seven substances （E, NE, DA, 5＇-HT, 5-HIAA, HVA and DOPAC）were prepared and the precisions and recovery rates of the same samples were determined respectively. Urine samples of 24 hours obtained from 12 healthy volunteers and 2 patients with phaeochromocytoma were analyzed respectively by HPLC. The unilateral forebrain bundles in PD group were destroyed with 6-hydroxydopamine （6-OHDA） for monitoring release characteristics of monoamine neurotransmitters and their metabolites in healthy and marred caudate putamen nucleus striatum of normal and PD rats striatum.MAIN OUTCOME MEASURES： ①Determination of the precisions and recovery rates of monoamines. ②The contents of catecholamines in 24 hours urine of 12 health volunteers and 2 patients with phaeochromocytoma .③The release characteristics of monoamines and their metabolites in rats striatum. RESULTS： The results and analysis of catecholamines substances in 24hours urine were all obtained from 12 health volunteers and 2 patients with pheochromocytoma. There were no animals died in the experinment, and all of them were involved in the result analysis. ①There was a favorable linear relationship in the range of 2-1 000 μg/L for DA, E, NE and DOPAC, 10-1 000 μg/L for 5-HIAA, HVA and 5-HT for 30-1 000 μg/L with HPLC. The minimal detection limit of DA, E, NE and DOPAC was 2 μg/L, 5-HIAA 10 μg/L, HVA and 5-HT 30 μg/L. The coefficient of variation （CV） in the same batch was 3.0%-8.6%, and the CV in the different batchs was 3.8%-9.7%. The average rates of recovery of DA, NE, E and other 4 kinds of substances were 107.3%, 89.4%, 80.1% and 89.2%-95.7%, respectively.②The contents of CA in 24 hours urine of the 2 patients with phaeochromocytomas were higher than those of the 12 healthy volunteers. One of patient samples showed that E was mainly higher than that of control group. Other samples showed that NE was mainly higher than that of control group. Otherwise , E and NE were ten times higher than that of control group. ③The contents of DA and its metabolites such as DOPAC and HVA in intact sides of hemiparkinsonian rats had no significant changes ,while the contents of DA, DOPAC and HVA in lesion sides were significantly decreased compared with the controls （P ＜ 0.01 ）.There were no significant changes in the contents of 5-HT and its metabolites 5-HIAA. ④The turnover rates of DA （DOPAC/DA and HVA/DA） in intact and lesion sides of hemiparkinsonian rats were all higher than those of the controls（P ＜ 0.05）.CONCLUSION： The method we developed is suitable for the experimental research of normal and hemiparkinsonian rat models and for the diagnostic testing of phaeochromocytoma.