title: Circadian Kinetics of Cell Cycle Progression in Adult Neurogenic Niches of a Diurnal Vertebrate.
abstract: The circadian system may regulate adult neurogenesis via intracellular molecular clock mechanisms or by modifying the environment of neurogenic niches, with daily variation in growth factors or nutrients depending on the animal's diurnal or nocturnal lifestyle. In a diurnal vertebrate, zebrafish, we studied circadian distribution of immunohistochemical markers of the cell division cycle (CDC) in 5 of the 16 neurogenic niches of adult brain, the dorsal telencephalon, habenula, preoptic area, hypothalamus, and cerebellum. We find that common to all niches is the morning initiation of G1/S transition and daytime S-phase progression, overnight increase in G2/M, and cycle completion by late night. This is supported by the timing of gene expression for critical cell cycle regulators cyclins D, A2, and B2 and cyclin-dependent kinase inhibitor p20 in brain tissue. The early-night peak inp20, limiting G1/S transition, and its phase angle with the expression of core clock genes,Clock1andPer1, are preserved in constant darkness, suggesting intrinsic circadian patterns of cell cycle progression. The statistical modeling of CDC kinetics reveals the significant circadian variation in cell proliferation rates across all of the examined niches, but interniche differences in the magnitude of circadian variation in CDC, S-phase length, phase angle of entrainment to light or clock, and its dispersion. We conclude that, in neurogenic niches of an adult diurnal vertebrate, the circadian modulation of cell cycle progression involves both systemic and niche-specific factors.SIGNIFICANCE STATEMENTThis study establishes that in neurogenic niches of an adult diurnal vertebrate, the cell cycle progression displays a robust circadian pattern. Common to neurogenic niches located in diverse brain regions is daytime progression of DNA replication and nighttime mitosis, suggesting systemic regulation. Differences between neurogenic niches in the phase and degree of S-phase entrainment to the clock suggest additional roles for niche-specific regulatory mechanisms. Understanding the circadian regulation of adult neurogenesis can help optimize the timing of therapeutic approaches in patients with brain traumas or neurodegenerative disorders and preserve neural stem cells during cytostatic cancer therapies.
authors.affiliation: Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts 02118.|School of Medicine, Universidad Los Andes, Bogota, 111711, Colombia.
authors.forename: Veronica
authors.identifier: 0000-0002-2050-5511
authors.initials: V
authors.lastname: Akle
authors.affiliation: Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts 02118.
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Stankiewicz
authors.affiliation: Harvard-Smithsonian Center for Astrophysics, Harvard University, Cambridge, Massachusetts 02138.
authors.forename: Vasili
authors.initials: V
authors.lastname: Kharchenko
authors.affiliation: Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts 02118.
authors.forename: Lili
authors.initials: L
authors.lastname: Yu
authors.affiliation: Department of Biomedical Informatics, Harvard Medical School, Boston, Massachusetts 02115, and.|Harvard Stem Cell Institute, Cambridge, Massachusetts 02138.
authors.forename: Peter V
authors.initials: PV
authors.lastname: Kharchenko
authors.affiliation: Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, Massachusetts 02118, zhdanova@bu.edu.
authors.forename: Irina V
authors.initials: IV
authors.lastname: Zhdanova
mesh_terms: D000818:Animals; D001973:Bromodeoxyuridine / Q000378:metabolism; D002453:Cell Cycle / Q000187:drug effects / Q000502:physiology*; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002940:Circadian Rhythm / Q000187:drug effects / Q000502:physiology*; D018844:Cyclin-Dependent Kinases / Q000235:genetics / Q000378:metabolism; D003624:Darkness; D008297:Male; D055495:Neurogenesis / Q000187:drug effects / Q000502:physiology*; D010879:Piperazines / Q000494:pharmacology; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D011725:Pyridines / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D013493:Suprachiasmatic Nucleus / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D015027:Zebrafish
chemical_list: D018797:Cell Cycle Proteins; D010879:Piperazines; D047428:Protein Kinase Inhibitors; D011725:Pyridines; D012333:RNA, Messenger; D018844:Cyclin-Dependent Kinases; D001973:Bromodeoxyuridine; C500026:palbociclib
keywords: BrdU; S phase; adult neurogenesis; cell cycle; circadian; zebrafish