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低温可降低大鼠癫痫持续状态后的死亡率,防止钙平台期出现,并具有神经保护作用。

Hypothermia Reduces Mortality, Prevents the Calcium Plateau, and Is Neuroprotective Following Status Epilepticus in Rats.

作者信息

Phillips Kristin F, Deshpande Laxmikant S, DeLorenzo Robert J

机构信息

Department of Neurology, Virginia Commonwealth University, Richmond, VA, United States.

Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA, United States.

出版信息

Front Neurol. 2018 Jun 11;9:438. doi: 10.3389/fneur.2018.00438. eCollection 2018.

Abstract

Status Epilepticus (SE) is a major neurological emergency and is considered a leading cause of Acquired Epilepsy (AE). We have shown that SE produces neuronal injury and prolonged alterations in hippocampal calcium levels ([Ca]) that may underlie the development of AE. Interventions preventing the SE-induced Ca plateau could therefore prove to be beneficial in lowering the development of AE after SE. Hypothermia is used clinically to prevent neurological complications associated with Traumatic Brain Injury, cardiac arrest, and stroke. Here, we investigated whether hypothermia prevented the development of Ca plateau following SE. SE was induced in hippocampal neuronal cultures (HNC) by exposing them to no added MgCl solution for 3 h. To terminate SE, low Mg solution was washed off with 31°C (hypothermic) or 37°C (normothermic) physiological recording solution. [Ca] was estimated with ratiometric Fura-2 imaging. HNCs washed with hypothermic solution exhibited [Ca] ratios, which were significantly lower than ratios obtained from HNCs washed with normothermic solution. For SE, the rat pilocarpine (PILO) model was used. Moderate hypothermia (30-33°C) in rats was induced at 30-min post-SE using chilled ethanol spray in a cold room. Hypothermia following PILO-SE significantly reduced mortality. Hippocampal neurons isolated from hypothermia-treated PILO SE rats exhibited [Ca] ratios which were significantly lower than ratios obtained from PILO SE rats. Hypothermia also provided significant neuroprotection against SE-induced delayed hippocampal injury as characterized by decreased FluoroJade C labeling in hypothermia-treated PILO SE rats. We previously demonstrated that hypothermia reduced Ca entry via N-methyl-D-aspartate and ryanodine receptors in HNC. Together, our studies indicate that by targeting these two receptor systems hypothermia could interfere with epileptogenesis and prove to be an effective therapeutic intervention for reducing SE-induced AE.

摘要

癫痫持续状态(SE)是一种严重的神经急症,被认为是获得性癫痫(AE)的主要病因。我们已经表明,SE会导致神经元损伤以及海马钙水平([Ca])的长期改变,这可能是AE发生的基础。因此,预防SE诱导的钙平台期的干预措施可能有助于降低SE后AE的发生。低温疗法在临床上用于预防与创伤性脑损伤、心脏骤停和中风相关的神经并发症。在此,我们研究了低温疗法是否能预防SE后钙平台期的出现。通过将海马神经元培养物(HNC)暴露于无添加MgCl₂的溶液中3小时来诱导SE。为了终止SE,用31°C(低温)或37°C(常温)的生理记录溶液冲洗掉低镁溶液。用比率式Fura-2成像估计[Ca]。用低温溶液冲洗的HNC显示出[Ca]比率,显著低于用常温溶液冲洗的HNC所获得的比率。对于SE,使用大鼠匹鲁卡品(PILO)模型。在SE后30分钟,在冷室中用冷乙醇喷雾诱导大鼠中度低温(30 - 33°C)。PILO - SE后的低温显著降低了死亡率。从低温治疗的PILO - SE大鼠分离的海马神经元显示出[Ca]比率,显著低于从PILO - SE大鼠获得的比率。低温还对SE诱导的延迟性海马损伤提供了显著的神经保护作用,表现为低温治疗的PILO - SE大鼠中FluoroJade C标记减少。我们之前证明,低温降低了HNC中通过N - 甲基 - D - 天冬氨酸和兰尼碱受体的钙内流。总之,我们的研究表明,通过靶向这两个受体系统,低温可能会干扰癫痫发生,并被证明是减少SE诱导的AE的有效治疗干预措施。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f974/6005175/c7ec24c19344/fneur-09-00438-g0001.jpg

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