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- Title
Mitogen- and stress-activated kinases regulate progenitor cell proliferation and neuron development in the adult dentate gyrus.
- Authors
Choi, Yun-Sik; Karelina, Kate; Alzate-Correa, Diego; Hoyt, Kari R.; Impey, Soren; Arthur, J. Simon; Obrietan, Karl
- Abstract
The neurogenic niche within the subgranular zone ( SGZ) of the dentate gyrus is a source of new neurons throughout life. Interestingly, SGZ proliferative capacity is regulated by both physiological and pathophysiological conditions. One outstanding question involves the molecular mechanisms that regulate both basal and inducible adult neurogenesis. Here, we examined the role of the MAPK-regulated kinases, mitogen- and stress-activated kinase ( MSK)1 and MSK2. as regulators of dentate gyrus SGZ progenitor cell proliferation and neurogenesis. Under basal conditions, MSK1/2 null mice exhibited significantly reduced progenitor cell proliferation capacity and a corollary reduction in the number of doublecortin ( DCX)-positive immature neurons. Strikingly, seizure-induced progenitor proliferation was totally blocked in MSK1/2 null mice. This blunting of cell proliferation in MSK1/2 null mice was partially reversed by forskolin infusion, indicating that the inducible proliferative capacity of the progenitor cell population was intact. Furthermore, in MSK1/2 null mice, DCX-positive immature neurons exhibited reduced neurite arborization. Together, these data reveal a critical role for MSK1/2 as regulators of both basal and activity-dependent progenitor cell proliferation and morphological maturation in the SGZ.
- Subjects
MITOGEN-activated protein kinases; PROGENITOR cells; CELL proliferation; NEURON development; DENTATE gyrus; DEVELOPMENTAL neurobiology; LABORATORY mice
- Publication
Journal of Neurochemistry, 2012, Vol 123, Issue 5, p676
- ISSN
0022-3042
- Publication type
Article
- DOI
10.1111/jnc.12035