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Actin depolymerizing factor is a component of slow axonal transport.

J J Bray1, P Fernyhough, J R Bamburg

  • 1MRC Cell Biophysics Unit, London, England.

Journal of Neurochemistry
|June 1, 1992
PubMed
Summary
This summary is machine-generated.

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Actin and actin depolymerizing factor (ADF) are transported via slow axonal transport in chicken sciatic nerves. This suggests actin may travel within axons in an unpolymerized complex with ADF.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Protein Transport

Background:

  • Actin is a crucial cytoskeletal protein involved in neuronal structure and function.
  • Axonal transport mechanisms are vital for maintaining neuronal integrity and function.
  • The specific proteins co-transported with actin during axonal transport remain incompletely understood.

Purpose of the Study:

  • To investigate the low molecular weight proteins transported with actin in the chicken sciatic nerve.
  • To identify potential actin-binding proteins involved in axonal transport.

Main Methods:

  • Injection of [35S]methionine into the lumbar spinal cord of chickens.
  • Analysis of proteins in the sciatic nerve using two-dimensional gel electrophoresis.
  • Quantification of radioactivity associated with specific proteins.

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Main Results:

  • A prominent 19 kDa protein, identified as actin depolymerizing factor (ADF), comigrated with actin during slow axonal transport.
  • Limited radioactivity was observed for profilin and cofilin, other actin monomer sequestering proteins.
  • Neither actin, ADF, profilin, nor cofilin were detected in significant quantities in the rapid component of axonal transport.

Conclusions:

  • Both actin and ADF are transported via slow axonal transport in the chicken sciatic nerve.
  • These findings suggest that actin may be transported within the axon in an unpolymerized state, potentially complexed with ADF.