Mitochondrial Protection to Prevent Neurobehavioral Changes after Postnatal Anesthesia

线粒体保护以防止产后麻醉后神经行为的变化

基本信息

批准号：
10831114
负责人：
MARIA C ALVARADO
金额：
$ 17.76万
依托单位：
WAKE FOREST UNIVERSITY HEALTH SCIENCES
依托单位国家：
美国
项目类别：
财政年份：
2020
资助国家：
美国
起止时间：
2020-06-01 至 2025-04-30
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10831114
关键词：
Mitochondrial Protection Prevent Neurobehavioral Changes

Mitochondrial Protection Prevent Neurobehavioral Changes

项目摘要

Project Summary General anesthetics may act as neurotoxins in the developing mammalian nervous system and cause long-term neurobehavioral changes after exposure in infancy. Repeated exposure is particularly deleterious to the developing nervous system, and children who undergo more than one general anesthesia before the age of 4 are at an increased risk for substantial emotional and cognitive changes. It is therefore critical that preventative treatments be found. Studies in animal models have suggested that persistent anesthetic-induced changes such as neurotoxicity, gliotoxicity, loss of synapses and changes in mitochondrial structure may lead to long-term behavioral impairments. Early effects of anesthesia on mitochondria may be key to long-term impairments: protection of mitochondria from oxidative stress caused by free radical generation from general anesthetics eliminates subsequent cognitive impairment in adulthood in rodents. We have established a nonhuman primate model of early anesthetic exposure. In a previous award, we showed that infant rhesus monkeys that received multiple exposures of to the inhalation anesthetic sevoflurane, commonly used in pediatric anesthesia, showed long-term changes in socioemotional and cognitive development when tested later in development. In this new proposal, we will use that model to test the hypothesis that neonatal anesthesia exposure is associated with long-term changes in synaptic and mitochondrial structure in the primate brain, and that protection of mitochondria from oxidative stress at the time of anesthesia exposure mitigates or prevents subsequent changes in cognitive and socioemotional development. Specifically, in Aim 1 of this project, mitochondrial and synaptic structure in adulthood will be examined at the electron microscopic level in tissue prepared and banked from those subjects from the previous award. For Aim 2, infant rhesus macaques will be exposed to sevoflurane (3 exposures in the six weeks of life) in the presence of R(+)pramipexole, a mitochondrial protectant, or treated with vehicle and will be followed behaviorally for 2 years to assess sparing of neurobehavioral changes in the treated group. We will determine whether R(+)pramipexole treatment also protects against synaptic and mitochondrial changes in these monkeys. Together, results from these studies can provide a causal link between anesthetic exposure, mitochondrial dysfunction, and altered emotional and cognitive behavior in monkeys. They will also provide a first step towards improved anesthetic protocols and preventative treatments that will allow children to undergo safe surgery while minimizing unintended long-term effects on the brain and behavior.

项目摘要一般麻醉剂可能在发育中的哺乳动物神经系统中充当神经毒素，并导致长期婴儿期暴露后的神经行为变化。反复暴露对发展神经系统，以及在4岁之前接受多次全身麻醉的孩子发生实质性情绪和认知变化的风险增加。因此，至关重要可以找到治疗。动物模型的研究表明，持续麻醉引起的变化这种变化随着神经毒性，神经毒性，突触的丧失和线粒体结构的变化可能会导致长期行为障碍。麻醉对线粒体的早期影响可能是长期障碍的关键：保护线粒体免受由全身麻醉的自由基产生引起的氧化应激消除了啮齿动物的成年后随后的认知障碍。我们已经建立了一个非人类的灵长类动物早期麻醉暴露的模型。在上一个奖项中，我们表明了接受的婴儿恒河猴在小儿麻醉中使用的吸入麻醉剂的多次暴露显示稍后在发展中测试时，社会情感和认知发展的长期变化。在这个新的中提案，我们将使用该模型来检验新生儿麻醉与灵长类动物大脑中突触和线粒体结构的长期变化，并保护麻醉暴露时氧化应激的线粒体减轻或防止随后的变化在认知和社会情感发展中。具体而言，在该项目的AIM 1中，线粒体和突触成年期的结构将在编制的组织中的电子显微镜水平上检查并从这些主题是上一个奖项。对于AIM 2，婴儿恒河猕猴将暴露于Sevoflurane（3 在R（+）pramipexole，线粒体保护剂或处理过的R（+）pramipexole存在下）使用车辆，将在行为上进行2年的行为，以评估神经行为变化的保留治疗组。我们将确定r（+）pramipexole治疗是否也可以防止突触和这些猴子的线粒体变化。总之，这些研究的结果可以在麻醉暴露，线粒体功能障碍以及猴子的情绪和认知行为改变。他们还将为改善麻醉方案和预防性治疗提供第一步儿童接受安全的手术，同时最大程度地减少对大脑和行为的长期影响。