缺血启动未成熟大鼠脑白质内源性修复功能的研究

摘要
图/表
参考文献(17)
相关文章 (15)
点击分布统计
下载分布统计

全文: PDF (2298 KB)
输出: BibTeX | EndNote (RIS) 背景资料

摘要目的：探讨缺血启动未成熟脑白质的内源性修复机制。方法：5日龄 Sprague-Dawley 新生大鼠随机分为假手术（Sham）组和PVL组。分别于建模后7 d及21 d光镜、电镜下评估脑白质病变及髓鞘形成情况，免疫组化检测脑白质O4+少突胶质细胞（OL）前体，观察SVZ区祖细胞的激活、增殖、迁移和分化情况。结果：与Sham组比较，PVL组在建模后7 d和21 d光镜下脑白质病理均呈轻或重度病变；病理评分均明显增高；髓鞘形成数量明显减少，厚度变薄；免疫组化显示O4+OL前体明显减少。建模48 h后，PVL组SVZ 区 BrdU、NG2共阳性祖细胞明显增殖并向脑室周围迁移，至7 d达到高峰；从72 h开始，脑室周围出现呈BrdU、O4共阳性OL前体，至21 d，新生OL前体明显多于同时段Sham组。结论：缺血可启动新生大鼠脑白质的内源性修复机制，诱导SVZ 区胶质源性神经祖细胞激活、增殖、迁移至脑室周围和分化为OL前体。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	李文娟
	陈惠金
	钱龙华
	毛凤霞

关键词 ：脑室周围白质软化, NG2神经祖细胞, 新生大鼠

Abstract：OBJECTIVE: To study in vivo the endogenous self-repair mechanism in immature white matter induced by ischemia in neonatal rats with periventricular leukomalacia (PVL). METHODS: Five-day-old neonatal Sprague-Dawley (SD) rats were randomly divided into sham and PVL groups. Rat model of PVL was prepared by ligation of the right common carotid artery following 2 hours of exposure to 8% oxygen. Pathological changes and myelination in the white matter were assessed under light and electron microscopy at 7 and 21 days after PVL. O4-positive OL precursor cells in the white matter were determined with immunofluorescence staining. Activation, proliferation, migration and differentiation of glial progenitor cells in SVZ were observed using immunofluorescent double labeling of either NG2 (marker of progenitor cells) and 5-bromodeoxyuridine (BrdU), or O4 (marker of OL precursor cells) and BrdU. RESULTS: All rats in the PVL group manifested either mild or severe white matter injury under light microscopy, and had higher pathological scores of white matter compared with the sham group at 7 and 21 days after PVL (P<0.05). Electron microscopy showed that the number and thickness of myelin sheath in the PVL group were significantly reduced compared with the sham group (P<0.01). O4-positive OL precursor cells in the white matter observed under fluorescence microscopy were significantly reduced in the PVL group compared with the sham group (P<0.05). BrdU/NG2-positive cells in the SVZ increased significantly in the PVL group 48 hours after PVL and migrated into the periventricular area, reaching a peak on day 7 after PVL. BrdU/O4-positive newborn cells began to appear in the periventricular area 72 hours after PVL, and the number of BrdU/O4-positive cells in the PVL group was statistically more than in the sham group on day 21 after PVL (P<0.05). CONCLUSIONS: Ischemia may induce brain self-repair in neonatal rats, resulting in activation and proliferation of NG2 glial progenitor cells in the SVZ migration and differentiation into OL precursor cells in periventricular white matter.

Key words： Periventricular leukomalacia NG2 progenitor cell Neonatal rats

PACS:

R-33

引用本文:

李文娟,陈惠金,钱龙华等. 缺血启动未成熟大鼠脑白质内源性修复功能的研究[J]. 中国当代儿科杂志, 2012, 14(07): 548-553.

LI Wen-Juan,CHEN Hui-Jin,QIAN Long-Hua et al. Endogenous self-repair in immature white matter induced by ischemia in neonatal rats[J]. CJCP, 2012, 14(07): 548-553.

链接本文:

http://www.zgddek.com/CN/ 或 http://www.zgddek.com/CN/Y2012/V14/I07/548

	［1］Khwaja O, Volpe JJ. Pathogenesis of cerebral white matter injury of prematurity［J］. Arch Dis Child Fetal Neonate Ed, 2008, 93(2): F153-F161.
	［2］Tramontin AD, García-Verdugo JM, Lim DA, Alvarez-Buyllan A. Postnatal development of radial glia and the ventricular zone (VZ): a continuum of the neural stem cell compartment［J］. Cereb Cortex, 2003, 13(6): 580-587.
	［3］Fagel DM, Ganat Y, Silbereis J, Ebbitt T, Stewart W, Zhang H, et al. Cortical neurogenesis enhanced by chronic perinatal hypoxia［J］. Exp Neurol, 2006, 199(1): 77-91.
	［4］Decressac M, Prestoz L, Veran J, Cantereau A, Jaber M,Gaillard A. Neuropeptide Y stimulates proliferation, migration and differentiation of neural precursors from the subventricular zone inadult mice［J］. Neurobiol Dis, 2009, 34(3): 441-449.
	［5］Curtis MA, Kam M, Nannmark U, Anderson MF, Axell MZ, Wikkelso C, et al. Human neuroblasts migrate to the olfactory bulb via a lateral ventricular extension［J］. Science, 2007, 315(5816): 1243-1249.
	［6］李文娟，陈惠金. 脑内在修复潜能机制［J］. 中国当代儿科杂志，2011，13（7）：606-611.
	［7］贺月秋，陈惠金，钱龙华，陈冠仪. 脑室周围白质软化新生大鼠模型的创建及所伴随的白内障病变［J］. 中国当代儿科杂志，2007，9（3）：220-224.
	［8］贺月秋，陈惠金，钱龙华，陈冠仪. 不同缺血方式制作脑室周围白质软化大鼠模型的比较［J］. 实验动物与比较医学，2010，30（3）：153-157
	［9］Uehara H, Yoshioka H, Kawase S, Nagai H, Ohmae T, Hasegawa K, et al. A new model of white matter injury in neonatal rats with bilateral carotid artery occlusion［J］. Brain Res, 1999, 837(1-2): 213-220.
	［10］Back SA, Luo NL, Borenstein NS, Levine JM, Volpe JJ, Kinney HC. Late oligodendrocyte progenitors coincide with the developmental window of vulnerability for human perinatal white matter injury［J］. J Neurosci, 2001, 21(4): 1302-1312.
	［11］Tramontin AD, Garcia-Verdugo JM, Lim DA, Alarvez-Buylla A. Postnatal development of radial glia and the ventricular zone (VZ): a continuum of the neural stem cell compartment［J］. Cereb Cortex, 2003, 13(6): 580-587.
	［12］Chandran S, Hunt D, Joannides A, Zhao C, Compston A, Franklin RJ. Myelin repair: the role of stem and precursor cells in multiple sclerosis［J］. Philos Trans R Soc Lond B Biol Sci, 2008, 363(1489): 117-183.
	［13］贺月秋，陈惠金，钱龙华，陈冠仪. 不同缺氧时间制作新生大鼠脑室周围白质软化动物模型的比较［J］. 中国比较医学杂志，2009，19（12）：10-13.
	［14］Munoz-Elias G, Woodbury D, Black IB. Marrow stromal cells, mitosis, and neuronal differentiation: stem cells and precursor functions［J］. Stem Cells, 2003, 21(4): 437-448.
	［15］Kuhn HG, Cooper-Kuhn CM. Bromodeoxyuridine and the detection of neurogenesis［J］. Curr Pharm Biotechnol, 2007, 8(3): 127-131.
	［16］Foster MT, Bartness TJ. Sympathetic but not sensory denervation stimulates white adipocyte proliferation［J］. Am J Physiol Regul Integr Comp Physiol, 2006, 291(6): R1630-R1637.
	［17］Sypecka J, Sarnowska A, Domanska-Janik K. Crucial role of the local micro-environment in fate decision of neonatal rat NG2 progenitors［J］. Cell Prolif, 2009, 42(5): 661671.