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山西省中医药研究院,太原 030012
Received:12 March 2021,
Published Online:24 May 2021,
Published:20 July 2021
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郭晋良,仲启明,吉海杰等.探讨蛇床子催眠活性组分对PCPA失眠大鼠褪黑素合成限速酶AANAT的调控作用[J].中国实验方剂学杂志,2021,27(14):47-52.
GUO Jin-liang,ZHONG Qi-ming,JI Hai-jie,et al.Regulation of Hypnotic Active Components of Cnidii Fructus on Melatonin Synthesis Rate-limiting Enzyme AANAT in Rats with PCPA-induced Insomnia[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(14):47-52.
郭晋良,仲启明,吉海杰等.探讨蛇床子催眠活性组分对PCPA失眠大鼠褪黑素合成限速酶AANAT的调控作用[J].中国实验方剂学杂志,2021,27(14):47-52. DOI: 10.13422/j.cnki.syfjx.20211309.
GUO Jin-liang,ZHONG Qi-ming,JI Hai-jie,et al.Regulation of Hypnotic Active Components of Cnidii Fructus on Melatonin Synthesis Rate-limiting Enzyme AANAT in Rats with PCPA-induced Insomnia[J].Chinese Journal of Experimental Traditional Medical Formulae,2021,27(14):47-52. DOI: 10.13422/j.cnki.syfjx.20211309.
目的
2
观察蛇床子催眠活性组分(CHC)对对氯苯丙氨酸(PCPA)失眠大鼠行为学、褪黑素(MT)合成限速酶芳基烷基胺
N
-乙酰基转移酶(AANAT)的影响,探讨其对松果体的保护机制。
方法
2
60只SPF级雄性SD大鼠随机分为正常、模型,MT阳性药,CHC高、中、低剂量6组,每组10只。除正常组其余各组腹腔注射4.5%PCPA混悬液,10 mL·kg
-1
,连续2 d,建立大鼠PCPA失眠模型。造模后正常及模型组灌胃等体积2%聚山梨酯-80,MT组(10 mg·kg
-1
),CHC高、中、低(60,30,15 mg·kg
-1
)给予10 mL·kg
-1
给药体积的药物,每日1次,连续7 d。给药4 d后分别进行旷场活动、高架十字迷宫、戊巴比妥钠协同睡眠试验,采用酶联免疫吸附法检测血清MT;实时荧光定量聚合酶链式反应(Real-time PCR)测定松果体MT合成关键酶AANAT mRNA表达水平;蛋白免疫印迹法(Western blot)检测松果体AANAT蛋白表达变化。
结果
2
与正常组比较,模型组大鼠旷场活动总距离、站立次数、中心区持续时间明显增加(
P
<
0.05,
P
<
0.01),高架开臂次数及时间比例下降(
P
<
0.05),入睡潜伏期显著延长(
P
<
0.01);与模型组比较,低剂量组无明显差异,其余各组大鼠活动总距离均减少(
P
<
0.05,
P
<
0.01),高架开臂次数百分比升高(
P
<
0.05),入睡潜伏期缩短、睡眠时间明显延长(
P
<
0.05,
P
<
0.01)。与正常组比较,模型组MT含量显著下降(
P
<
0.01);与模型组比较,低剂量组差异无明显统计学意义,其余各组血清MT不同程度的升高(
P
<
0.05)。与正常组比较,模型组AANAT mRNA表达量,AANAT蛋白表达量下降(
P
<
0.01);与模型组比较,MT组,CHC高剂量组表达量明显增加(
P
<
0.05)。
结论
2
CHC改善PCPA失眠行为学指标、增加松果体细胞合成分泌MT,提高血清MT水平,与上调松果体AANAT mRNA及其蛋白的表达有关。
Objective
2
To observe the effects of Cnidii Fructus hypnotic active components (CHC) on the behaviors of rats with p-chlorophenylalanine (PCPA)-induced insomnia and melatonin (MT) synthesis rate-limiting enzyme arylalkylamine
N
-acetyltransferase (AANAT), and explore the protective mechanism of CHC on the pineal gland.
Method
2
Male SD rats of SPF grade were randomly divided into a blank control group, a model group, a MT group, and high-, medium-, and low-dose CHC groups with 10 rats in each group. Except for the blank control group, other groups received 4.5% PCPA suspension at 10 mL·kg
-1
, intragastric administration, for two consecutive days. After PCPA model of insomnia was established, normal and model groups were gavaged at the same volume of 2% Tween-80, MT control group (10 mg·kg
-1
), CHC was high, medium and low (60, 30, 15 mg·kg
-1
), 10 mL·kg
-1
, once a day, for consecutive 7 days. Four days after administration, open field, elevated cross maze, and pentobarbital sodium-induced sleep tests were conducted, respectively. Serum MT was detected by enzyme-linked immunosorbent assay. The mRNA expression level of AANAT was determined by real-time fluorescence-based quantitative polymerase chain reaction (Real-time PCR). The expression of AANAT protein in the pineal gland was detected by Western blot.
Result
2
Compared with the results in the blank control group, the total distance of open field activity and standing times and duration in the central area were increased (
P
<
0.05,
P
<
0.01), the proportions of open arm entry (OE%) and open arm time (OT%) were decreased (
P
<
0.05), and the sleep latency was prolonged (
P
<
0.01) in the model group. Compared with the model group, no significant difference was observed in the low-dose CHC group, while other groups exhibited reduced total distance of activity (
P
<
0.05,
P
<
0.01), elevated OE% (
P
<
0.05), shortened sleep latency, and prolonged sleep time (
P
<
0.05,
P
<
0.01). Compared with the serum MT in the blank control group, that in the model group was decreased (
P
<
0.01). Compared with the model group, no significant difference was observed in the low-dose CHC group, while other groups displayed increased serum MT (
P
<
0.05). The mRNA and protein expression of AANAT was decreased in the model group as compared with that in the blank control group (
P
<
0.01). Compared with the model group, the MT group and the high-dose CHC group showed up-regulated expression (
P
<
0.05).
Conclusion
2
CHC improved the behavioral indexes of PCPA-induced insomnia, increased the synthesis and secretion of MT in pineal cells, and elevated the serum MT level, which was related to the up-regulation of the mRNA and protein expression of AANAT in the pineal gland.
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