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Expanding the Toolkit for In Vivo Imaging of Axonal Transport
Published on: December 23, 2021
Axonal transport deficit in a KIF5A( -/- ) mouse model.
Kathrin N Karle1, Diana Möckel, Evan Reid
1Department of Neurology, Hertie Institute for Clinical Brain Research and German Center of Neurodegenerative Diseases, University of Tübingen, Hoppe-Seyler-Str. 3, 72076 Tübingen, Germany.
Neurogenetics
|April 3, 2012
Summary
KIF5A deficiency impairs motor neuron survival and axonal growth, impacting mitochondrial transport. This research provides key insights into KIF5A-related hereditary spastic paraplegia (HSP) pathophysiology.
Area of Science:
- Neuroscience
- Genetics
- Cell Biology
Background:
- Hereditary spastic paraplegia (HSP) is a neurodegenerative disorder affecting long corticospinal axons.
- SPG10, a form of HSP, results from mutations in the KIF5A gene, encoding a neuronal kinesin heavy chain protein.
- KIF5A knockout mice exhibit early mortality and spinal cord abnormalities, but the underlying mechanisms are unclear.
Purpose of the Study:
- To investigate the role of KIF5A in neuronal survival, process outgrowth, and mitochondrial transport.
- To elucidate the pathophysiology of KIF5A-associated hereditary spastic paraplegia (HSP).
Main Methods:
- Primary motor and sensory neuron cultures were established from KIF5A knockout mice.
- Neuronal survival, neurite outgrowth, and mitochondrial transport dynamics were analyzed.
Main Results:
- KIF5A absence reduced motor neuron survival and significantly diminished axonal and dendritic outgrowth in motor neurons.
- Mitochondrial transport velocity (anterograde and retrograde) was decreased in KIF5A-deficient motor neurons.
- Sensory neurons showed reduced neurite outgrowth but unchanged neurite number.
Conclusions:
- KIF5A is crucial for neuronal process outgrowth and mitochondrial axonal transport, with a more pronounced effect on motor neurons.
- These findings offer pathophysiological insights into KIF5A-related HSP, consistent with the degeneration of long corticospinal tract axons observed clinically.
