Neurogenesis in the striatum of the quinolinic acid lesion model of Huntington's disease

被引:159
作者
Tattersfield, AS
Croon, RJ
Liu, YW
Kells, AP
Faull, RLM
Connor, B
机构
[1] Univ Auckland, Dept Pharmacol & Clin Pharmacol, Fac Med & Hlth Sci, Auckland 1, New Zealand
[2] Univ Auckland, Dept Anat Radiol, Fac Med & Hlth Sci, Auckland 1, New Zealand
关键词
neurogenesis; progenitor cells; striatum; subventricular zone; basal ganglia; neurodegeneration;
D O I
10.1016/j.neuroscience.2004.04.061
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The presence of ongoing neurogenesis in the adult mammalian brain raises the exciting possibility that endogenous progenitor cells may be able to generate new neurons to replace cells lost through brain injury or neuro-degenerative disease. We have recently demonstrated increased cell proliferation and the generation of new neurons in the Huntington's disease human brain. In order to better understand the potential role of endogenous neuronal replacement in neurodegenerative disorders and extend our initial observations in the human Huntington's disease brain, we examined the effect of striatal cell loss on neurogenesis in the subventricular zone (SVZ) of the adult rodent forebrain using the quinolinic acid (QA) lesion rat model of Huntington's disease. Cell proliferation and neurogenesis were assessed with bromodeoxyuricline (BrdU) labeling and immunocytochemistry for cell type-specific markers. BrdU labeling demonstrated increased cell proliferation in the SVZ ipsilateral to the QA-lesioned striatum, resulting in expansion of the SVZ in the lesioned hemisphere. Quantification revealed that QA lesion-induced striatal cell loss produced a significant increase in the area of BrdU-immunoreactivity in the SVZ ipsilateral to the lesioned hemisphere between 1 and 14 days post-lesion compared with sham-lesioned animals, with the greatest increase observed at 7 days post-lesion. These changes were associated with an increase in cells in the anterior SVZ ipsilateral to the lesioned striatum expressing the antigenic marker for SVZ neuroblasts, doublecortin (Dcx). Importantly, we observed Dcx-positive cells extending from the SVZ into the QA-lesioned striatum where a subpopulation of newly generated cells expressed markers for immature and mature neurons. This study demonstrates that loss of GABAergic medium spiny projection neurons following QA striatal lesioning of the adult rat brain increases SVZ neurogenesis, leading to the putative migration of neuroblasts to damaged areas of the striatum and the formation of new neurons. (C) 2004 IBRO. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:319 / 332
页数:14
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