期刊
JOURNAL OF NEUROSCIENCE
卷 24, 期 25, 页码 5810-5815出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1109-04.2004
关键词
focal cerebral ischemia; cell division; neural progenitor cells; subventricular zone; mitosis; rats
资金
- NHLBI NIH HHS [R01HL 64766, R01 HL064766] Funding Source: Medline
- NINDS NIH HHS [R01NS38292, P01 NS042345, P01 NS23393, P01 NS023393, P01 NS42345, R01 NS038292] Funding Source: Medline
The orientation of mitotic cleavage regulates neurogenesis during neural development. We examined the orientation of mitotic cleavage of dividing progenitor cells in the subventricular zone (SVZ) of adult rats subjected to stroke. In nonstroke rats, 55% of dividing cells were oriented horizontally, whereas 40% were oriented vertically. Horizontal and vertical cleavage orientations produce asymmetric and symmetric divisions, respectively. Four days after stroke, the number of dividing cells increased twofold, whereas the proportion of symmetric dividing cells significantly (p < 0.01) increased from 40% before stroke to 60%. Fourteen days after stroke, the percentage of symmetric dividing cells was 47%. Stroke-increased numbers of dividing cells in M-phase were confirmed by immuostaining. In nonstroke rats, 37 and 33% of symmetric and asymmetric dividing cells, respectively, exhibited a neuronal marker (TuJ1). Four days after stroke, rats exhibited a significant (p < 0.05) augmentation of the frequency( 47%) of neuronal distribution showing TuJ1 immunoreactivity in cells with symmetric division but not cells with asymmetric division ( 33%). Numb immunoreactivity was detected in SVZ cells of nonstroke rats. Stroke did not change Numb distribution. Our data suggest that neurons are produced by both asymmetric and symmetric cell divisions in the adult SVZ, and the transient increases in symmetric division and neuronal differentiation may result in stroke-induced neurogenesis.
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