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7-NI and ODQ Disturbs Memory in the Elevated Plus Maze, Morris Water Maze, and Radial Arm Maze Tests in Mice

机译:7-NI和ODQ干扰小鼠高架迷宫,莫里斯水迷宫和,臂迷宫测试中的记忆

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Nitric oxide (NO) is an atypical neurotransmitter that causes changes in cognition. Nitric oxide synthase (NOS) and guanylate cyclase (GC) inhibitors have been shown to exert some effects on cognition in previous studies; however, the findings have been controversial. This study was aimed at understanding the effects of an NOS inhibitor, 7-nitroindazole (7-NI), and a guanylate cyclase inhibitor, 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), on spatial memory in modified elevated plus maze (mEPM), Morris water maze (MWM), and radial arm maze (RAM) tests. Male Balb-c mice were treated via intraperitoneal injections with 7-NI (15 mg/kg), ODQ (3, 10 mg/kg), L-arginine (100 mg/kg) + 7-NI (15 mg/kg), or physiological saline. ODQ (3 mg/kg) and 7-NI (15 mg/kg) significantly increased the second-day latency in the mEPM test. 7-NI (15 mg/kg) and ODQ (10 mg/kg) significantly increased the escape latency in second, third, and fourth sessions, decreased the time spent in the escape platform’s quadrant, and increased the mean distance to the platform in the probe trial of the MWM test. ODQ (3, 10 mg/kg) and 7-NI (15 mg/kg) significantly increased the number of errors, whereas only 7-NI increased the latency in the RAM test. The administration of L-arginine (100 mg/kg) prior to 7-NI inverted the effects of 7-NI, which supports the role of NO on cognition. Our study shows that the NO/cGMP/GS pathway can regulate spatial memory in mice.
机译:一氧化氮(NO)是引起认知变化的非典型神经递质。一氧化氮合酶(NOS)和鸟苷酸环化酶(GC)抑制剂在先前的研究中已显示出对认知的作用。但是,这一发现引起了争议。这项研究旨在了解NOS抑制剂7-硝基吲唑(7-NI)和鸟苷酸环化酶抑制剂1H- [1,2,4] oxadiazolo [4,3-a] quinoxalin-1-one的作用。 (ODQ),关于改进的高架迷宫(mEPM),莫里斯水迷宫(MWM)和radial臂迷宫(RAM)测试中的空间记忆。通过腹膜内注射7-NI(15 mg / kg),ODQ(3,10 mg / kg),L-精氨酸(100 mg / kg)+ 7-NI(15 mg / kg)来治疗雄性Balb-c小鼠或生理盐水。 ODQ(3 mg / kg)和7-NI(15 mg / kg)显着增加了mEPM测试的第二天潜伏期。 7-NI(15 mg / kg)和ODQ(10 mg / kg)显着增加了第二,第三和第四阶段的逃生潜伏期,减少了在逃生平台象限中花费的时间,并增加了到逃生平台的平均距离。 MWM测试的探针试验。 ODQ(3,10 mg / kg)和7-NI(15 mg / kg)显着增加了错误数量,而只有7-NI增加了RAM测试中的等待时间。在7-NI前给予L-精氨酸(100 mg / kg)可以逆转7-NI的作用,这支持NO在认知中的作用。我们的研究表明,NO / cGMP / GS途径可以调节小鼠的空间记忆。

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