Handling and environmental enrichment do not rescue learning and memory impairments in αCamKIIT286A mutant mice

Handling and environmental enrichment do not rescue learning and memory impairments in αCamKIIT286A mutant mice
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处理和环境富集并不能挽救 αCamKIIT286A 突变小鼠的学习和记忆障碍

DOI:
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发表时间:
2003
期刊:
Genes, Brain and Behavior
影响因子:
--
通讯作者:
K. Giese
K. Giese
中科院分区:
--
文献类型:
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作者:
A. Need;K. Giese

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环境富集和产后处理已被证明可以改善莫里斯水迷宫的学习和记忆,并挽救由基因改造、年龄或遗传背景引起的损伤。具有阻止 Ca2+/钙调蛋白依赖性激酶 II 的 α 同工型苏氨酸 286 处自身磷酸化的靶向点突变的小鼠,会损害水迷宫中海马依赖性和独立性策略学习和记忆。我们研究了是否可以通过在混合遗传背景下结合产后处理和环境富集来挽救这些损伤。在富集和非富集突变体的习得和探索试验中都发现了严重的损伤,这表明富集并不能挽救学习和记忆障碍。然而,充实确实弥补了特定的绩效缺陷。突变体中的漂浮行为增强。总之,我们发现 Ca2+/钙调蛋白依赖性激酶 II 的 α-同种型缺乏自磷酸化会阻止富集诱导的策略学习和记忆障碍的挽救。此外,我们已经确定存在独立于这种自磷酸化的富集机制。
Environmental enrichment and postnatal handling have been shown to improve learning and memory in the Morris water maze, and to rescue impairments caused by genetic modification, age or genetic background. Mice with a targeted point mutation that prevents autophosphorylation at threonine‐286 of the α‐isoform of the Ca2+/calmodulin‐dependent kinase II have impaired hippocampus‐dependent and ‐independent strategy learning and memory in the water maze. We have investigated whether these impairments can be rescued with a combination of postnatal handling and environmental enrichment in a hybrid genetic background. Severe impairments were seen in acquisition and probe trials in both enriched and nonenriched mutants, indicating that enrichment did not rescue the learning and memory impairments. However, enrichment did rescue a specific performance deficit; enhanced floating behaviour, in the mutants. In summary, we have shown the lack of autophosphorylation of the α‐isoform of the Ca2+/calmodulin‐dependent kinase II prevents enrichment‐induced rescues of strategy learning and memory impairments. Furthermore, we have established that there are enrichment mechanisms that are independent of this autophosphorylation.
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