Anaesthesist:2%七氟烷反复吸入会导致青年大鼠神经毒性和认知功能障碍

2018-01-25 周倩 “罂粟花”微信号

七氟醚是儿科麻醉中使用最广泛的吸入麻醉药之一。大量研究表明,在新生儿期七氟醚高浓度麻醉或持续时间较长的反复治疗可诱发神经细胞凋亡和长期学习障碍。在临床实践中,我们观察到一部分患者在七氟醚麻醉下从出生到青春期不止一次进行了小手术。因此,本研究旨在探讨七氟醚浓度为2%(七氟烷临床相关用量)持续1 h(持续时间短)在新生儿期是否可诱导接受七氟醚(2%,1 h)的青春期大鼠神经细胞凋亡和神经认知功能障碍。

背景与目的:七氟醚是儿科麻醉中使用最广泛的吸入麻醉药之一。大量研究表明,在新生儿期七氟醚高浓度麻醉或持续时间较长的反复治疗可诱发神经细胞凋亡和长期学习障碍。在临床实践中,我们观察到一部分患者在七氟醚麻醉下从出生到青春期不止一次进行了小手术。因此,本研究旨在探讨七氟醚浓度为2%(七氟烷临床相关用量)持续1 h(持续时间短)在新生儿期是否可诱导接受七氟醚(2%,1 h)的青春期大鼠神经细胞凋亡和神经认知功能障碍。

方  法:第一组:出生后第7天的新生大鼠(PND-7)在受控条件下用氧气处理,然后升至PND-60。第二组:PND-7大鼠用2%七氟烷处理1小时,然后饲养至PND-60。第三组:PND-60大鼠用2%七氟醚处理1小时,第四组PND-7大鼠用2%七氟醚处理1小时,然后再用2%七氟醚在PND-60再麻醉1小时。 Western blot检测海马齿状回(DG)中caspase-3,Bax和Bcl-2的表达。用NeuN / caspase-3双免疫荧光染色评估海马DG中的神经凋亡。空间参考记忆由Morris水迷宫测试测试。

结  果:七氟醚(2%,1 h)对PND-7大鼠和PND-60大鼠未引起明显的海马神经细胞凋亡;它们在海马依赖的空间记忆中的表现没有显着受损;然而,第四组大鼠在Morris水迷宫实验中表现不佳,第四组神经细胞凋亡显着增加。

结  论:我们的研究结果表明,七氟醚可以诱导产后期反复七氟醚(2%,1 h)的青春期大鼠的神经细胞凋亡和认知功能障碍。这些研究结果将促进进一步的研究,以调查重复七氟烷暴露对中枢神经系统的发展和学习和记忆功能,以及体内和体外的潜在机制的影响。

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    2018-12-16 AspirantSuo
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    2018-01-27 skhzy

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