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An Ex Vivo Laser-induced Spinal Cord Injury Model to Assess Mechanisms of Axonal Degeneration in Real-time

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Cellular dynamics underlying regeneration of damaged axons differs from initial axon development.

C A Blizzard¹, M A Haas, J C Vickers

¹NeuroRepair Group, Menzies Research Institute, University of Tasmania, Private Bag 29, Hobart, Tasmania, Australia 7000.

The European Journal of Neuroscience

|September 5, 2007

Summary

Mature neurons attempt regeneration after injury, but their growth cones differ significantly from developing ones. These intrinsic differences in size, dynamics, and growth factor response limit successful axon regeneration in the central nervous system (CNS).

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Area of Science:

Neuroscience
Cell Biology
Regenerative Medicine

Background:

Mammalian long-distance axon regeneration is limited.
Mature neurons possess some capacity for regeneration.
The adult central nervous system (CNS) presents inhibitory factors to axon growth.

Purpose of the Study:

To investigate intrinsic differences between developing and regenerating axons.
To understand why mature CNS axon regeneration is limited and inappropriate.
To compare neurochemical and dynamic characteristics of developing versus regenerating axons.

Main Methods:

Utilized an in vitro model of axonal transection.
Employed long-term cultured rat cortical neurons.
Performed immunolabelling studies and live imaging.

Main Results:

Regenerating and developing axons share similar cytoskeletal protein localization.
Regenerating axon growth cones are smaller with reduced fillopodial extension compared to developmental growth cones.
Regenerating axons show less outgrowth, reduced pausing, and unresponsiveness to BDNF and GDNF growth factors.

Conclusions:

Growth cones of regenerative sprouts differ intrinsically from developmental counterparts in size, dynamics, and growth factor responsiveness.
These intrinsic differences contribute to the limited and inaccurate regenerative response observed in the mature CNS.
Understanding these differences is crucial for improving strategies for neuronal repair after CNS trauma.