Reactive astrocytes show enhanced inwardly rectifying K+ currents in situ

被引:26
作者
Bordey, A [1 ]
Hablitz, JJ [1 ]
Sontheimer, H [1 ]
机构
[1] Univ Alabama, Dept Neurobiol, Birmingham, AL 35294 USA
关键词
glial cells; gliosis; K+ channels; patch-clamp; scar;
D O I
10.1097/00001756-200009280-00022
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Injury and diseases of the nervous system can induce astrocytes to form tenacious glial scars. We induced focal cortical freeze-lesions in neonatal rats and examined scars histologically and electrophysiologically in tissue slices isolated 2-3 weeks after lesioning. Lesions displayed marked gliosis, characterized by upregulation of GFAP labeling. Reactive astrocytes surrounding the scar showed marked hypertrophy, enlarged cell bodies and extended processes frequently terminating with endfeet-like structures on blood vessels. These reactive astrocytes showed enhanced expression of inwardly rectifying K+ (K-IR) channels, widely believed to be an important pathway for astrocytic K+ buffering. These results suggest that a subpopulation of reactive astrocytes along a glial scar might be instrumental in buffering K+ away from the lesion. NeuroReport 11:3151-3155 (C) 2000 Lippincott Williams & Wilkins.
引用
收藏
页码:3151 / 3155
页数:5
相关论文
共 23 条
[1]   Postnatal development of ionic currents in rat hippocampal astrocytes in situ [J].
Bordey, A ;
Sontheimer, H .
JOURNAL OF NEUROPHYSIOLOGY, 1997, 78 (01) :461-477
[2]  
D'Ambrosio R, 1999, J NEUROSCI, V19, P8152
[3]   GFAP AND ASTROGLIOSIS [J].
ENG, LF ;
GHIRNIKAR, RS .
BRAIN PATHOLOGY, 1994, 4 (03) :229-237
[4]   Excitability changes in freeze-induced neocortical microgyria [J].
Hablitz, JJ ;
DeFazio, T .
EPILEPSY RESEARCH, 1998, 32 (1-2) :75-82
[5]   ASTROGLIA IN CNS INJURY [J].
HATTEN, ME ;
LIEM, RKH ;
SHELANSKI, ML ;
MASON, CA .
GLIA, 1991, 4 (02) :233-243
[6]   Hyperexcitability in a model of cortical maldevelopment [J].
Jacobs, KM ;
Gutnick, MJ ;
Prince, DA .
CEREBRAL CORTEX, 1996, 6 (03) :514-523
[7]   Focal epileptogenesis in a rat model of polymicrogyria [J].
Jacobs, KM ;
Hwang, BJ ;
Prince, DA .
JOURNAL OF NEUROPHYSIOLOGY, 1999, 81 (01) :159-173
[8]  
Janigro D, 1997, J NEUROSCI, V17, P2813
[9]   SPATIAL BUFFERING OF LIGHT-EVOKED POTASSIUM INCREASES BY RETINAL MULLER (GLIAL) CELLS [J].
KARWOSKI, CJ ;
LU, HK ;
NEWMAN, EA .
SCIENCE, 1989, 244 (4904) :578-580
[10]  
LOGAN A, 1992, J NEUROSCI, V12, P3828