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Previous Article | Next Article
The Journal of Neuroscience, February 1, 2000, 20(3):1085-1095
Separate Proliferation Kinetics of Fibroblast Growth Factor-Responsive and Epidermal Growth Factor-Responsive Neural Stem Cells within the Embryonic Forebrain Germinal Zone
David J. Martens, Vincent Tropepe, and Derek van der Kooy University of Toronto, Department of Anatomy and Cell Biology, Toronto, Ontario M5S 1A8, Canada
The embryonic forebrain germinal zone contains two separate and additive populations of epidermal growth factor (EGF)- and fibroblast growth factor (FGF)-responsive stem cells that both exhibit self-renewal and multipotentiality. Although cumulative S phase labeling studies have investigated the proliferation kinetics of the overall population of precursor cells within the forebrain germinal zone through brain development, little is known about when and how (symmetrically or asymmetrically) the small subpopulations of stem cells are proliferating in vivo. This has been determined by injecting timed-pregnant mice with high doses of tritiated thymidine (3H-thy) to kill any stem cells proliferating within the striatal germinal zone in vivo and then by assaying for neurosphere formation in vitro. Injections of 0.8 mCi of 3H-thy given every 2 hr for 12 hr to timed-pregnant mice at E11, E14, and E17 resulted in significant depletions in the number of neurospheres generated by FGF-responsive stem cells at E11 and by EGF-responsive and FGF-responsive stem cells at E14 and E17. With increasing embryonic age, the depletions observed in the number of neurospheres generated in vitro in response to FGF2 after exposure to 3H-thy in vivo decreased, suggesting there is an increase in the length of the cell cycle of FGF-responsive neural stem cells through embryonic development. The results suggest that the FGF-responsive stem cell population expands between E11 and E14 by dividing symmetrically, but switches to primarily asymmetric division between E14 and E17. The EGF-responsive stem cells arise after E11, and their population expands through symmetric divisions and through asymmetric divisions of FGF-responsive stem cells.
Key words: stem cells; cell cycle; symmetric divisions; asymmetric divisions; 3H-thymidine; embryonic forebrain
Copyright © 2000 Society for Neuroscience 0270-6474/00/2031085-11$05.00/0
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