白芍提取物对大鼠海马原代培养神经元5-羟色胺3受体介导离子通道的影响

目的探讨白芍提取物含药血清对原代培养海马神经元5-羟色胺3受体(5-HT3R)介导离子通道的影响。方法采用孤养结合慢性温和刺激法复制抑郁情绪大鼠模型,并采用旷场实验和糖水偏好实验进行模型评价,以白芍提取物进行药物干预,制备大鼠含药血清,对原代培养的大鼠海马神经元干预24 h后,利用Western blotting法检测各组神经元细胞5-HT3AR、5-HT3BR蛋白表达,采用全细胞膜片钳技术检测各组神经元细胞5-HT3受体通道电流。结果与对照组相比,模型组大鼠旷场实验总路程、糖水偏好率均显著性降低(P0.01);模型组大鼠血清孵育的海马神经元5-HT3AR、5-HT3BR蛋白表达量均显著性升高(P0.05),模型组大鼠血清孵育的海马神经元电流密度值明显增加(P0.05)。与模型组相比,白芍提取物组和氟西汀组旷场实验总得分明显提高(P0.05),糖水偏好率均明显增加(P0.01);白芍提取物组和氟西汀组大鼠含药血清孵育的海马神经元5-HT3AR、5-HT3BR蛋白表达量显著性降低(P0.05、0.01、0.001);白芍提取物组和氟西汀组大鼠含药血清孵育的海马神经元电流密度值均明显减少(P0.01)。结论白芍提取物能改善抑郁情绪模型大鼠异常升高的5-HT3R离子通道电流,这可能是白芍发挥其抗抑郁情绪的中枢作用机制之一。

Effect of Paeoniae Alba Radix extract on 5-HT3 receptor pathway in primarily cultured rat hippocampal neurons

Objective To investigate the effects of Paeoniae Alba Radix extracts (PAREs) on 5-HT₃R mediated ion channels in primarily cultured hippocampal neurons of rats with depression. Methods An animal model of depression was successfully developed and evaluated in rats. PARE was used for drug intervention. Serum in each group was collected, inactivated and then added into the primary hippocampal neurons for 24 h. The protein expression levels of 5-HT_3AR and 5-HT_3BR in the neurons of each group were examined by Western blotting (WB). The 5-HT₃R channel current was recorded by a whole-cell patch clamp. Results Compared with normal rats, the rats with depression had significantly reduction in total distance of the open-field test (OFT) and sucrose preference ratio (P < 0.01). The hippocampal neurons treated with serum of depressive rats had significantly increased protein expression of 5-HT_3AR and 5-HT_3BR (P < 0.05) and current density value (P < 0.05) compared to those treated with normal rat serum. Compared with the depressive rats, the rats treated with PARE and fluoxetine had significantly increased OFT (P < 0.05) and sucrose preference ratio (P < 0.01). The primary hippocampal neurons cultured with serum from PARE and fluoxetine-treated rats had significantly reduction in protein expression of 5-HT_3AR and 5-HT_3BR (P < 0.05, 0.01, 0.001) and current density value (P < 0.01). Conclusion PARE can reduce the 5-HT₃R ion channel current density in the rats with depression. This may be its central mechanism in treating depression.