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Related Concept Videos

Glial Cells01:04

Glial Cells

Overview
Nervous Tissue: Glial Cells01:31

Nervous Tissue: Glial Cells

Glia, or neuroglia, are vital support cells that assist neurons in their functions. The term "glia" originates from the Greek word for "glue," reflecting their role in holding the nervous system together. These cells can be categorized into six types: four in the central nervous system (CNS) and two in the peripheral nervous system (PNS).
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Cytokinesis segregates a cell’s chromosomes and organelles into its daughter cells. Organelles divide and grow prior to cell division but cannot be synthesized de novo; therefore, cells must receive at least one copy of each organelle to survive. Currently, many of the details of how the organelles are distributed are not yet fully elucidated.
Distribution of cytoplasmic determinants
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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...

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Dissection and Isolation of Murine Glia from Multiple Central Nervous System Regions
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Dividing glial cells maintain differentiated properties including complex morphology and functional synapses.

Woo-Ping Ge1, Wei Zhou, Qingming Luo

  • 1Howard Hughes Medical Institute and Department of Physiology, University of California, San Francisco, CA 94158, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 24, 2008
PubMed
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Dividing NG2 glial cells (NG2 cells) in the brain maintain their differentiated state, exhibiting complex features and synaptic activity during mitosis. This challenges the long-held belief that cell division and differentiation are incompatible processes.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Glial Cell Biology

Background:

  • Cell division and differentiation are typically considered mutually exclusive processes due to strict regulatory mechanisms.
  • NG2 glial cells (NG2 cells) are the primary proliferating cells in the mammalian central nervous system (CNS) and form synaptic connections with neurons.

Purpose of the Study:

  • To investigate whether NG2 cells can divide while maintaining their differentiated characteristics.
  • To determine if dividing NG2 cells retain physiological functions, such as synaptic activity and electrical excitability.

Main Methods:

  • Utilized advanced microscopy and electrophysiological techniques to observe and record from NG2 cells during cell division.
  • Assessed morphological complexity, synaptic input reception, and action potential firing in mitotic NG2 cells.

Main Results:

  • NG2 cells were observed to divide while preserving complex cellular processes and differentiated morphology.
  • Dividing NG2 cells actively received excitatory and inhibitory synaptic inputs.
  • A subpopulation of dividing NG2 cells demonstrated the ability to fire action potentials, indicating retained voltage-gated ion channel function.

Conclusions:

  • Cell division and differentiation are not necessarily incompatible, as demonstrated by NG2 glial cells.
  • Dividing NG2 cells retain crucial physiological functions, including synaptic integration and electrical excitability, challenging established cell biology paradigms.