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Related Experiment Videos

Proliferation and apoptosis in the developing human neocortex.

Wood Yee Chan1, Dietrich E Lorke, Sau Cheung Tiu

  • 1Department of Anatomy, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China.

The Anatomical Record
|July 19, 2002
PubMed
Summary

Cell proliferation and apoptosis in the developing human brain are crucial for central nervous system (CNS) formation. Proliferation peaks around week 12, with shifts in cell division modes and locations throughout gestation.

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Area of Science:

  • Developmental Neuroscience
  • Neurobiology
  • Cell Biology

Background:

  • Cell kinetics, encompassing proliferation and apoptosis, governs the development of the central nervous system (CNS).
  • Understanding these processes is key to comprehending human neocortex formation.

Purpose of the Study:

  • To detail the temporal and spatial dynamics of cell proliferation and apoptosis during human central nervous system development.
  • To investigate the changing modes of cell division and their contribution to neuronal and glial cell generation.

Main Methods:

  • Analysis of cell kinetics in the developing human neocortex.
  • Immunohistochemical detection of proliferating cell nuclear antigen (PCNA) to identify proliferating cells.
  • Observation of mitotic figures and apoptotic nuclei to track cell division and cell death.

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Main Results:

  • Proliferation is initially confined to the ventricular zone, shifting to the subventricular zone by week 7.
  • Peak proliferation occurs around week 12, characterized by symmetric cell division, transitioning to asymmetric division later.
  • Apoptosis is present from week 5, increasing around midgestation and distributed across cortical layers, particularly in proliferative zones.

Conclusions:

  • Cell proliferation and apoptosis are tightly regulated and interconnected during early CNS development.
  • The spatial and temporal patterns of proliferation and apoptosis shape the developing human neocortex.
  • Apoptosis may play a role in eliminating neurons that fail to establish proper axonal connections in later developmental stages.