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创伤后癫痫大鼠模型中脂质代谢的改变:一种可能的途径。

Altered lipid metabolism in post-traumatic epileptic rat model: one proposed pathway.

作者信息

Srivastava Niraj Kumar, Mukherjee Somnath, Sharma Rajkumar, Das Jharana, Sharma Rohan, Kumar Vikas, Sinha Neeraj, Sharma Deepak

机构信息

School of Life Sciences, Jawaharlal Nehru University, 110067, New Delhi, India.

Center of Biomedical Research (CBMR), Sanjay Gandhi Postgraduate Institute of Medical Sciences Campus, 226014, Lucknow, UP, India.

出版信息

Mol Biol Rep. 2019 Apr;46(2):1757-1773. doi: 10.1007/s11033-019-04626-9. Epub 2019 Jan 31.

Abstract

Post-traumatic epilepsy (PTE) is a common long-term risk associated with traumatic brain injury (TBI). PTE rat model, proposed by Willmore et al., is a well known model that mimics human PTE. The present study explored the lipid metabolism in this PTE rat model by using in vitro, high-resolution NMR (nuclear magnetic resonance) spectroscopy and lipid staining based investigations. The level of gene expression, cytokines and enzyme activity was estimated. Level of TG (triglycerides), PL (phospholipids) and CHOL (cholesterol) was found to increase in brain tissue of PTE rats. This is an indication of the altered lipid metabolism in PTE rats. Level of lipid peroxidation and cytokines was enhanced in the brain tissue of PTE rats. A positive correlation was also observed in cytokines vs. lipid peroxidation. These results make available the evidence of the oxidative stress induced damage or destruction of the lipid components and also the cause of the inflammatory events in PTE rats. Antioxidant enzyme activity and respective gene expression were found to increase in brain tissue of PTE rats. A positive correlation was also observed in antioxidant enzyme's activity vs. respective enzyme gene expression and lipid peroxidation vs. activity of antioxidant enzymes. Such outcomes reflect the oxidative stress induced lipid damage responsible for production enhancement of antioxidant enzymes, which further responsible for enhancing the activity of antioxidant enzymes. A positive correlation was observed in lipid peroxidation vs. lipid components (TG, PL and CHOL) and provides the confirmatory verification of alteration in the level of lipid components. A negative correlation was observed in the level of cytokines and the quantity of TG. This showed that TG is consumed in the production of cytokines. MUA (Motor unit activity) is highly correlated with the level of LP and indicated that oxidative stress is responsible for the event of epileptogenesis. Positive correlation of MUA with RA (rearing activity) and MWM (Morris-water maze) showed that epileptogenesis also influences the memory of PTE rats. Overall results based analyses clearly indicate that the inflammatory activity and oxidative stress in brain tissue of PTE rats, which are responsible to establish a significant change in the lipid metabolism. This can be visualized through a well constructed possible pathway of altered lipid metabolism. This study will improve our understanding and approach in the field of epilepsy that need to be considered for the development of new drugs or therapy for patients with PTE. Representation of the proposed pathway of altered lipid metabolism in posttraumatic epileptic rats.

摘要

创伤后癫痫(PTE)是与创伤性脑损伤(TBI)相关的常见长期风险。Willmore等人提出的PTE大鼠模型是一种众所周知的模拟人类PTE的模型。本研究通过体外高分辨率核磁共振(NMR)光谱和基于脂质染色的研究,探索了该PTE大鼠模型中的脂质代谢。估计了基因表达、细胞因子和酶活性水平。发现PTE大鼠脑组织中甘油三酯(TG)、磷脂(PL)和胆固醇(CHOL)水平升高。这表明PTE大鼠的脂质代谢发生了改变。PTE大鼠脑组织中脂质过氧化和细胞因子水平升高。细胞因子与脂质过氧化之间也观察到正相关。这些结果提供了氧化应激诱导脂质成分损伤或破坏以及PTE大鼠炎症事件原因的证据。发现PTE大鼠脑组织中抗氧化酶活性和相应基因表达增加。抗氧化酶活性与相应酶基因表达以及脂质过氧化与抗氧化酶活性之间也观察到正相关。这些结果反映了氧化应激诱导的脂质损伤导致抗氧化酶产生增加,进而导致抗氧化酶活性增强。脂质过氧化与脂质成分(TG、PL和CHOL)之间观察到正相关,证实了脂质成分水平的改变。细胞因子水平与TG量之间观察到负相关。这表明TG在细胞因子产生过程中被消耗。运动单位活动(MUA)与脂质过氧化水平高度相关,表明氧化应激是癫痫发生事件的原因。MUA与竖毛活动(RA)和莫里斯水迷宫(MWM)呈正相关,表明癫痫发生也影响PTE大鼠的记忆。基于总体结果的分析清楚地表明,PTE大鼠脑组织中的炎症活动和氧化应激导致脂质代谢发生显著变化。这可以通过构建良好的脂质代谢改变可能途径来可视化。本研究将增进我们对癫痫领域的理解和方法,这对于开发针对PTE患者的新药或疗法需要加以考虑。创伤后癫痫大鼠脂质代谢改变的拟议途径示意图。

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