白藜芦醇抑制大鼠穹隆下器神经元放电(英文)  被引量:3

Resveratrol inhibits the electrical activity of subfornical organ neurons in rat

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作  者:李明[1] 王庆山[1] 陈怡[2] 王泽民[1] 刘政[1] 郭淑梅[1] 

机构地区:[1]河北医科大学基础医学研究所生理室,石家庄050017 [2]河北医科大学基础医学研究所病理教研室,石家庄050017

出  处:《生理学报》2005年第4期523-528,共6页Acta Physiologica Sinica

摘  要:应用细胞外记录单位放电技术,在大鼠穹隆下器脑片上观察了白藜芦醇(resveratrol)对穹隆下器神经元放电的影响。实验结果如下:(1)给予白藜芦醇(1、5、10μmol/L)2min后,大多数穹隆下器神经元(60/65,92.3%)的自发性放电频率呈剂量依赖性降低;(2)预先用0.3mmol/L的L-glutamate灌流穹隆下器脑片,全部放电单位(12/12,100%)放电频率明显增加,表现为癫痫样放电,在此基础上灌流白藜芦醇(5μmol/L)2min,大多数脑片(10/12,83.3%)的癫痫样放电被抑制;(3)预先用L型钙通道开放剂BayK8644灌流,全部(8/8,100%)放电增加,在此基础上灌流白藜芦醇(5μmol/L)2min,其放电全部被抑制;(4)灌流一氧化氮合酶抑制剂NG-nitro-L-argininemethylester(L-NAME)50μmol/L,多数脑片(11/14,78.6%)放电明显增加,在此基础上灌流白藜芦醇(5μmol/L)2min,大部分神经元(9/11,81.8%)放电被抑制;(5)灌流大电导钙激活性钾通道阻断剂tetraethylammoniumchloride(TEA)1mmol/L后,大多数神经元(10/12,83.3%)放电增加,在此基础上灌流白藜芦醇(5μmol/L)2min,(9/10,90%)放电频率明显减低。以上结果提示:白藜芦醇能抑制大鼠穹隆下器神经元自发放电以及由L-glutamate、L-NAME、BayK8644和TEA诱发的放电,可能与白藜芦醇抑制L型钙通道以及促进一氧化氮的释放有关;似乎与大电导钙激活性钾通道无关。The effects of resveratrol on the discharges of neurons in rat subfornical organ (SFO) slices were examined by using extracellular recording technique. The results are as follows: (1) In response to the application of resveratrol (1, 5, 10 μmol/L, n=65) into the superfusate for 2 min, the spontaneous discharge rate of 60/65 (92.3%) neurons was significantly decreased in a dosedependent manner; (2) Application of L-glutamate (0.3 mmol/L) into the superfusate led to a marked increase in discharge rate of all 12 (100%) neurons in an epileptiform pattern. The increased discharges of 10/12 (83.3%) neurons were suppressed by application of resveratrol (5 μmol/L); (3) In 8 neurons, the selective L-type calcium channel agonist, Bay K8644 (0.1μmol/L), induced a significant increase in discharge rate of all 8 (100%) neurons. The increased discharges of all 8 (100%) neurons were suppressed by resveratrol (5μmol/L); (4) In 14 neurons, nitric oxide synthase (NOS) inhibitor A^G-nitro-L-arginine methyl ester (L-NAME) 50μmol/L significantly increased the discharge rate of 11/14 (78.6%) neurons. Resveratrol (5 μmol/L) applied into the superfusate reduced the increased discharges of 9/11 (81.8%) neurons; (5) In 12 neurons, the large-conductance Ca^2+-activated K^+ channel blocker tetraethylammonium chloride (TEA) 1 mmol/L significantly increased the discharge rate of 10/12 (83.3%) neurons. Resveratrol (5 μmol/L) inhibited the increased discharges of 9/10 (90%) neurons. These results suggest that resveratrol inhibits the electrical activity of SFO neurons. This effect may be related to its properties of blockade of L-type voltage-gated calcium channel and nitric oxide (NO) promoting, and probably has no association with large-conductance Ca^2+-activated K^+ channel.

关 键 词:白藜芦醇 穹隆下器 钙通道 一氧化氮 

分 类 号:Q424[生物学—神经生物学]

 

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