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The Journal of Neuroscience, March 21, 2007, 27(12):3157-3162; doi:10.1523/JNEUROSCI.4969-06.2007

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Neurobiology of Disease
Neuroblast Division during Migration toward the Ischemic Striatum: A Study of Dynamic Migratory and Proliferative Characteristics of Neuroblasts from the Subventricular Zone

Rui Lan Zhang,¹ Yvonne LeTourneau,¹ Sara R. Gregg,¹ Ying Wang,¹ Yier Toh,¹ Adam M. Robin,¹ Zheng Gang Zhang,¹ and Michael Chopp^1,2

¹Neurology Department, Henry Ford Health Sciences Center, Detroit, Michigan 48202, and ²Physics Department, Oakland University, Rochester, Michigan 48309

Correspondence should be addressed to Dr. Michael Chopp, Neurology Research Building, Room 3056, Henry Ford Health Sciences Center, 2799 West Grand Boulevard, Detroit, MI 48202. Email: chopp{at}neuro.hfh.edu

Ischemic stroke induces neurogenesis in the subventricular zone (SVZ), and newly generated neurons in the SVZ migrate toward the ischemic boundary. However, the characteristics of migrating SVZ cells have not been investigated after stroke. Using time-lapse imaging in both SVZ cells and organotypic brain slice cultures, we measured the dynamics of SVZ cell division and migration of adult rats subjected to stroke. In normal brain slices, SVZ cells primarily migrated dorsally and ventrally along the lateral ventricular surface. However, in stroke brain slices, SVZ cells migrated laterally toward the striatal ischemic boundary. Cultured stroke-derived SVZ cells exhibited a significant (p < 0.01) increase in the migration distance (212 ± 21 µm) compared with the nonstroke-derived SVZ cells (97 ± 12 µm). Migrating stroke-derived SVZ cells spent significantly (p = 0.01) less time in cytokinesis (0.63 ± 0.04 h) compared with the time (1.09 ± 0.09 h) for nonstroke-derived SVZ cells. Newborn cells with a single leading process exhibited fast migration (7.2 ± 0.8 µm/h), and cells with multiple processes showed stationary migration (3.6 ± 0.8 µm/h). Stroke SVZ daughter cells further divided during their migration. The morphology of doublecortin (DCX)-positive cells in fixed brain sections resembled those observed in cultured newborn cells, and the DCX-positive cells proliferated in the ischemic striatum. Collectively, the present study suggests that stroke promotes cytokinesis of migrating neuroblasts, and these cells migrate toward the ischemic striatum with distinct migratory behaviors and retain the capacity for cell division during migration.

Key words: migration; neurogenesis; neuroblast; proliferation; stroke; subventricular zone

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Received Nov. 15, 2006; revised Jan. 3, 2007; accepted Jan. 4, 2007.

Correspondence should be addressed to Dr. Michael Chopp, Neurology Research Building, Room 3056, Henry Ford Health Sciences Center, 2799 West Grand Boulevard, Detroit, MI 48202. Email: chopp{at}neuro.hfh.edu

This article has been cited by other articles:

				L. Wang, Z. G. Zhang, S. R. Gregg, R. L. Zhang, Z. Jiao, Y. LeTourneau, X. Liu, Y. Feng, J. Gerwien, L. Torup, et al. The Sonic Hedgehog Pathway Mediates Carbamylated Erythropoietin-enhanced Proliferation and Differentiation of Adult Neural Progenitor Cells J. Biol. Chem., November 2, 2007; 282(44): 32462 - 32470. [Abstract] [Full Text] [PDF]

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