中国当代儿科杂志Issue(8)：859-863,5.DOI:10.7499/j.issn.1008-8830.2015.08.019
脂多糖诱导脓毒症大鼠远期脑线粒体损伤的初步研究
A preliminary study of long-term mitochondrial dysfunction in rat brain caused by lipopolysaccharide-induced sepsis
摘要
Abstract
ObjectiveTo preliminarily investigate the long-term structural and functional injuries of mitochondria in rat brain caused by sepsis.MethodsWistar rats were randomly assigned into sepsis and control groups. A rat model of sepsis was prepared by an intraperitoneal injection of 10 mg/kg lipopolysaccharide (LPS) of gram-negative bacteria, and the survival assay was performed. Eight rats in the sepsis group were sacrificed at 12, 24, 48, or 72 hours after LPS injection, while rats in the control group were sacriifced after an intraperitoneal injection of an equal volume of normal saline. Mitochondria were extracted from rat brain tissue. Mitochondrial membrane potential (MMP) and mitochondrial swelling level were determined by flow cytometry, and the activities of electron transport chain complexes (I-V) were measured using enzyme assay kits. Hematoxylin-eosin (HE) staining and electron microscopy were used to observe morphological changes in brain tissue and mitochondria.ResultsThe sepsis group had a significantly lower survival rate than the control group (P<0.01). The MMP and activities of electron transport chain complexes (I-V) in the sepsis group, which were significantly lower than those in the control group (P<0.05), were reduced to the lowest levels at 48 hours and partially recovered at 72 hours. The mitochondrial swelling level in the sepsis group, which was signiifcantly higher than that in the control group (P<0.05), increased to the peak level at 48 hours and partially recovered at 72 hours. Hematoxylin and Eosin staining revealed substantial damages in the structure of brain tissue, and electron microscopy showed mitochondrial swelling, and vacuolization in a few mitochondria. ConclusionsIn the rat model of LPS-induced sepsis, both structural and functional injuries are found in cerebral mitochondria, and achieve the peak levels probably at around 48 hours.关键词
脓毒症/脑/线粒体功能障碍/线粒体膜电位/线粒体呼吸链复合物/大鼠Key words
Sepsis/Brain/Mitochondrial dysfunction/Mitochondrial membrane potential/Electron transport chain complex/Rats引用本文复制引用
吕娟娟,曾其毅,陈志江,项丹,郑贵浪,王斌,陶少华,谢美燕,刘翠,黄锦达..脂多糖诱导脓毒症大鼠远期脑线粒体损伤的初步研究[J].中国当代儿科杂志,2015,(8):859-863,5.基金项目
国家自然科学基金（81272070）；广东省科技计划项目（2010B031600238）。 （）
