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Related Concept Videos

Neurogenesis and Regeneration of Nervous Tissue01:15

Neurogenesis and Regeneration of Nervous Tissue

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...
Nervous Tissue: Myelin01:25

Nervous Tissue: Myelin

The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
Schwann cells begin to form myelin sheaths around axons during fetal development. They wrap around a small...

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Genetic Study of Axon Regeneration with Cultured Adult Dorsal Root Ganglion Neurons
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Guidance molecules in axon regeneration.

Roman J Giger1, Edmund R Hollis, Mark H Tuszynski

  • 1Department of Cell and Developmental Biology and Department of Neurology, University of Michigan, Ann Arbor, Michigan 48109-2200, USA. rgiger@umich.edu

Cold Spring Harbor Perspectives in Biology
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Regenerating the adult mammalian central nervous system (CNS) after injury is challenging due to inhibitory molecules. Therapies targeting these inhibitors and promoting growth show promise in animal models for spinal cord injury (SCI).

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Spinal Cord Injury Research

Background:

  • Adult mammalian central nervous system (CNS) has limited regenerative capacity, leading to permanent neurological deficits after injury.
  • Spinal cord injury (SCI) severs vital neural pathways, necessitating strategies to restore lost innervation.
  • Injured CNS tissue presents significant barriers to axonal regeneration due to inhibitory molecules.

Purpose of the Study:

  • To explore strategies for reestablishing lost innervation following CNS injury.
  • To investigate the molecular mechanisms underlying the limited regeneration in the adult CNS.
  • To evaluate therapeutic approaches for promoting neuronal growth and sprouting after SCI.

Main Methods:

  • Identification and classification of CNS inhibitors (axon guidance molecules, myelin inhibitors, proteoglycans) and growth promoters (ECM molecules, cell adhesion molecules, neurotrophic factors).
  • Investigating cell-intrinsic regulatory mechanisms influencing neuronal growth after injury.
  • Developing and testing mono and combination therapies in experimental animal models of SCI.

Main Results:

  • Therapeutic strategies involving reducing extrinsic inhibitory cues, increasing growth-promoting cues, or activating intrinsic growth programs have shown success.
  • Combination therapies that simultaneously promote growth and attenuate inhibition have yielded positive outcomes.
  • Promoted axonal growth and sprouting in animal models of SCI correlate with improved behavioral function.

Conclusions:

  • Overcoming the inhibitory environment of the injured CNS is crucial for promoting regeneration.
  • Therapeutic interventions targeting both inhibitory and growth-promoting pathways are effective in preclinical SCI models.
  • Translating promising SCI treatment strategies from animal models to human patients remains a significant challenge.