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Sleep-Awake Profile Related Circadian D-Alanine Rhythm in Human Serum and Urine

机译:人血清和尿液中与睡眠-觉醒特征相关的昼夜节律D-丙氨酸节律

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The circadian profiles of D-alanine (Ala) amounts in human serum and urine have been clarified using a two-dimensional HPLC system combining a microbore reversed-phase C18 column and a Pirkle-type enantioselective column. The two-dimensional HPLC system enables the determination of trace amounts of D-Ala in the clinical samples without severe interference from intrinsic substances in the human physiological fluids. In the volunteers having normal sleep-awake patterns, the amounts of D-Ala in the serum were high in the late evening and low in the morning. On the other hand, in the volunteers having the reversed sleep-awake patterns, the amounts of D-Ala in the serum were high in the morning and low in the nighttime. The similar circadian changes of D-Ala amounts were observed in the urine. These 24-h profiles of D-Ala are almost the same as those observed in rats and mice, suggesting that D-Ala has fundamental physiological functions related to rest-active conditions in mammals, and could also be useful as the biomarker for sleep-awake profiles.
机译:使用结合了微孔反相C18色谱柱和Pirkle型对映选择性色谱柱的二维HPLC系统,已经弄清了人血清和尿液中D-丙氨酸(Ala)量的昼夜节律分布。二维HPLC系统可测定临床样品中痕量的D-Ala,而不会受到人体生理液中内在物质的严重干扰。在具有正常睡眠-清醒模式的志愿者中,血清中D-Ala的含量在傍晚时较高,而早晨时较低。另一方面,在具有相反的睡眠-清醒模式的志愿者中,血清中D-Ala的量在早晨较高,而在夜间较低。在尿液中观察到类似的D-Ala量昼夜变化。 D-Ala的这些24-h谱与在大鼠和小鼠中观察到的谱几乎相同,这表明D-Ala具有与哺乳动物静息状态有关的基本生理功能,还可以用作睡眠生物标志物。唤醒配置文件。

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