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首页> 外文期刊>Brain research >Ability of NMDA and non-NMDA receptor antagonists to inhibit cerebral ischemic damage in aged rats.
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Ability of NMDA and non-NMDA receptor antagonists to inhibit cerebral ischemic damage in aged rats.

机译:NMDA和非NMDA受体拮抗剂抑制老年大鼠脑缺血损伤的能力。

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摘要

Although stroke is a major cause of death and disability in the elderly, the inhibitory effects of neuroprotectants in acute stroke have been investigated using experimental cerebral ischemic models of young animals. Recent clinical trials have found that few neuroprotectants are effective. These observations indicate that effects in the clinical setting do not always reflect data from young animals. Thus, we compared the effects of the NMDA receptor antagonist MK-801 and of the AMPA receptor antagonist NBQX [2,3-dihydroxy-6-nitro-7-sulfamoyl-benzo(F)quinixaline] on ischemic cerebral damage in the photothrombosis model of aged and young rats. MK-801 administered immediately after MCA occlusion significantly (P<0.05) reduced the extent of cerebral damage in young, but not in aged, rats and the effects of NBQX were similar. In separate experiments, we evaluated brain damage after microinjecting NMDA or kainic acid into the cortex using a stereotaxic apparatus. We found no significant differences in focalcerebral damage caused by NMDA between young and aged rats. On the other hand, kainic acid caused all of the aged rats tested to die, but none of the young rats. Our observations indicate that NMDA and AMPA receptor antagonists are less effective in aged, than in young, rats and that cerebral damage by receptor agonists depends on the type of receptor, such as NMDA and AMPA.
机译:尽管中风是老年人死亡和致残的主要原因,但是已经使用实验性幼小动物脑缺血模型研究了神经保护剂对急性中风的抑制作用。最近的临床试验发现几乎没有神经保护剂有效。这些观察结果表明,在临床环境中的影响并不总是反映幼小的动物的数据。因此,我们在光血栓形成模型中比较了NMDA受体拮抗剂MK-801和AMPA受体拮抗剂NBQX [2,3-二羟基-6-硝基-7-氨磺酰基-苯并(F)喹喔啉]对缺血性脑损伤的作用。和老年大鼠。 MCA闭塞后立即给药的MK-801显着(P <0.05)降低了幼鼠的脑损伤程度,但未降低老年鼠的脑损伤程度,并且NBQX的作用相似。在单独的实验中,我们使用立体定位仪将NMDA或海藻酸微注射到皮层后评估了大脑损伤。我们发现幼鼠和老年鼠在NMDA引起的局灶性脑损伤中无显着差异。另一方面,海藻酸导致所有测试的衰老大鼠死亡,但没有一只年轻大鼠死亡。我们的观察结果表明,NMDA和AMPA受体拮抗剂在老年大鼠中的作用不如年轻大鼠,并且受体激动剂引起的脑损伤取决于受体的类型,例如NMDA和AMPA。

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