Patterns of p57Kip2 expression in embryonic rat brain suggest roles in progenitor cell cycle exit and neuronal differentiation
Open accessAbstract
In developing central nervous system, a variety of mechanisms couple cell cycle exit to differentiation during neurogenesis. The cyclin‐dependent kinase (CDK) inhibitor p57Kip2 controls the transition from proliferation to differentiation in many tissues, but roles in developing brain remain uncertain. To characterize possible functions, we defined p57Kip2 protein expression in embryonic (E) day 12.5 to 20.5 rat brains using immunohistochemistry combined with markers of proliferation and differentiation. The p57Kip2 was localized primarily in cell nuclei and positive cells formed two distinct patterns including wide dispersion and laminar aggregation that were brain region‐specific. From E12.5 to E16.5, p57Kip2 expression was detected mainly in ventricular zone (VZ) and/or mantle zone of hippocampus, septum, basal ganglia, thalamus, hypothalamus, midbrain, and spinal cord. After E18.5, p57Kip2 was detected in select regions undergoing differentiation. The p57Kip2 expression was also compared with regional transcription factors, including Ngn2, Nkx2.1, and Pax6. Time course studies performed in diencephalon showed that p57Kip2 immunoreactivity colocalized with BrdU at 8 hr in nuclei exhibiting the wide dispersion pattern, whereas colocalization in the laminar pattern occurred only later. Moreover, p57Kip2 frequently colocalized with neuronal marker, β‐III tubulin. Finally, we characterized relationships of p57Kip2 to CDK inhibitor p27Kip1: in proliferative regions, p57Kip2 expression preceded p27Kip1 as cells underwent differentiation, though the proteins colocalized in substantial numbers of cells, suggesting potentially related yet distinct functions of Cip/Kip family members during neurogenesis. Our observations that p57Kip2 exhibits nuclear expression as precursors exit the cell cycle and begin expressing neuronal characteristics suggests that the CDK inhibitor contributes to regulating the transition from proliferation to differentiation during brain development. © 2008 Wiley Periodicals, Inc. Develop Neurobiol, 2009
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The genes chosen for expression analysis have all recently been implicated in antidepressant drug action and neurogenesis.
“These genes were chosen because they have all recently been implicated in antidepressant drug action and neurogenesis.35, 36, 37, 38, 39, 12, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49”
From Antidepressants increase human hippocampal neurogenesis by activating the glucocorticoid receptor (2011) · cites this paper as [39]
p27Kip1 and p57Kip2 are GR-target genes that promote cell cycle exit and increase neuronal differentiation in the developing rat brain.
“p27Kip1 and p57Kip2 are GR-target genes that promote cell cycle exit and increase neuronal differentiation in the developing rat brain.39, 38, 69”
From Antidepressants increase human hippocampal neurogenesis by activating the glucocorticoid receptor (2011) · cites this paper as [39]
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References 66 · Cited by 43
Research works printed but not linked: 1
- DiCicco-Bloom E Sondell M Sadock BJ Sadock VZ Neural development and neurogenesis Kaplan & Sadock's Comprehensive Textbook of Psychiatry 2005 Philadelphia Lippincott-Williams & Wilkins 33 49
- Authors
- Ye, W., Mairet‐Coello, G., Pasoreck, E., & DiCicco‐Bloom, E.
- Affiliations
- Rutgers, The State University of New Jersey (US)
- Venue
- Developmental Neurobiology
- Publisher
- Wiley
- Published
- 2008-09-23
- Volume
- 69
- Issue
- 1
- Pages
- 1-21
- ISSN
- 1932-8451 (ISSN-L)
- 1932-846X
- PMC
- PMC2967216
- OpenAlex
- W2078959588
- Cited by
- 43
- References
- 66
- Citations by year
- 2022: 1 · 2021: 1 · 2020: 2 · 2019: 3 · 2018: 1 · 2017: 2 · 2015: 3 · 2014: 4 · 2013: 6 · 2012: 3
- FWCI
- 1.70
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Developmental Neurobiology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute of Neurological Disorders and Stroke (R01NS032401)
- Topics
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Congenital heart defects research
- Keywords
- p57KIP2, cyclin-dependent kinase inhibitors, neurogenesis, cell cycle exit, neuronal differentiation, embryonic brain development, progenitor cells, p27, Ngn2, TTF-1, Pax6, bromodeoxyuridine, TUBB3, hippocampus, diencephalon, Cip/Kip family
- MeSH terms
- Animals, Brain, Bromodeoxyuridine, Cell Cycle, Cell Differentiation, Embryo, Mammalian, Female, Neurons, Pregnancy, Time Factors, Rats, Sprague-Dawley, Gene Expression Regulation, Developmental, Cell Proliferation, Cyclin-Dependent Kinase Inhibitor p57, Rats, Embryonic Stem Cells, Neurogenesis
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