Differential role of N-methyl-D-aspartate receptor subunits 2A and 2B in mediating phencyclidine-induced perinatal neuronal apoptosis and behavioral deficits.

Differential role of N-methyl-D-aspartate receptor subunits 2A and 2B in mediating phencyclidine-induced perinatal neuronal apoptosis and behavioral deficits.
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DOI:
10.1016/j.neuroscience.2009.07.058
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发表时间:
2009-11-10
期刊:
影响因子:
3.3
通讯作者:
Johnson, K. M.
Johnson, K. M.
中科院分区:
医学3区
文献类型:
--
作者:
Anastasio, N. C.;Xia, Y.;O'Connor, Z. R.;Johnson, K. M.

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PCP 诱导围产期大鼠细胞凋亡和精神分裂症样行为发展的机制尚不完全清楚。我们使用含有 NR2A 和 NR2B 的 NMDAR 拮抗剂来检验 PCP 的行为和细胞凋亡效应是通过阻断含有 NR1/NR2A 的受体而不是含有 NR1/NR2B 的受体介导的假设。 Sprague-Dawley 大鼠在 PN7、9 和 11 时用 PCP (10 mg/kg)、PEAQX(NR2A 优先拮抗剂,10、20 或 40 mg/kg)或艾芬地尔(选择性 NR2B 拮抗剂,1、5 或 10 mg/kg)治疗,并处死以测量 caspase-3 活性(细胞凋亡指数)或允许 年龄并在 PN28-35 上测试了对 PCP 挑战的运动敏感性。 PN7、9 和 11 上的 PCP 或 PEAQX 显着升高皮质中的 caspase-3 活性;艾芬地尔没有效果。仅在用高剂量 PEAQX (20 mg/kg) 进行亚慢性治疗后,纹状体细胞凋亡才明显。在 PN7、9 和 11 上用 PCP 或 PEAQX 治疗的动物在 PN28-35 上表现出对 PCP 攻击的敏化运动反应。艾芬地尔治疗对这两项指标均没有影响。因此,PCP 对皮质 NR1/NR2A(而不是 NR1/NR2B)的阻断似乎是 PCP 诱导的细胞凋亡和长期行为缺陷发展的原因。
The mechanism underlying PCP-induced apoptosis in perinatal rats and the development of schizophrenic-like behaviors is incompletely understood. We used antagonists for NR2A- and NR2B-containing NMDARs to test the hypothesis that the behavioral and apoptotic effects of PCP are mediated by blockade of NR1/NR2A-containing receptors, rather than NR1/NR2B-containing receptors. Sprague-Dawley rats were treated on PN7, 9, and 11 with PCP (10 mg/kg), PEAQX (NR2A-preferring antagonist, 10, 20, or 40 mg/kg), or ifenprodil (selective NR2B antagonist, 1, 5, or 10 mg/kg) and sacrificed for measurement of caspase-3 activity (an index of apoptosis) or allowed to age and tested for locomotor sensitization to PCP challenge on PN28-35. PCP or PEAQX on PN7, 9, and 11 markedly elevated caspase-3 activity in the cortex; ifenprodil showed no effect. Striatal apoptosis was evident only after sub-chronic treatment with a high dose of PEAQX (20 mg/kg). Animals treated with PCP or PEAQX on PN7, 9 and 11 showed a sensitized locomotor response to PCP challenge on PN28-35. Ifenprodil treatment had no effect on either measure. Therefore, PCP blockade of cortical NR1/NR2A, rather than NR1/NR2B, appears to be responsible for PCP-induced apoptosis and the development of long-lasting behavioral deficits.
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