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Multiple proteases regulate neurite outgrowth in NB2a/dl neuroblastoma cells
T B Shea1, M L Beermann, R A Nixon
1Ralph Lowell Laboratories, Mailman Research Center, McLean Hospital, Belmont, Massachusetts.
Journal of Neurochemistry
|March 1, 1991
Summary
Proteases regulate neuronal development. Inhibitors targeting thrombin and calpain promote stable axonal neurite outgrowth in neuroblastoma cells, suggesting distinct proteolytic events are crucial for neurite initiation and stabilization.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Mouse NB2a/dl neuroblastoma cells can extend axonal neurites.
- Neurite outgrowth is influenced by various chemical stimuli.
- Proteolytic enzymes play a role in cellular processes.
Purpose of the Study:
- To investigate the role of specific proteases, thrombin and calpain, in axonal neurite outgrowth.
- To determine how inhibitors of these proteases affect neurite initiation, elongation, and stabilization.
Main Methods:
- Treatment of NB2a/dl cells with hirudin (thrombin inhibitor) and cysteine protease inhibitors (leupeptin, CI, CII).
- Culturing cells under serum-containing and serum-deprived conditions.
- Enzyme assays to confirm protease inhibition specificity.
Main Results:
- Hirudin initiated neurite outgrowth but led to retraction.
- Cysteine protease inhibitors enhanced serum deprivation-induced outgrowth.
- Combined treatment with hirudin and cysteine protease inhibitors resulted in stable neurites.
- Inhibitors showed specific targeting of thrombin and/or calpain.
Conclusions:
- Distinct proteolytic events involving multiple proteases regulate axonal neurite outgrowth.
- Protease activity is critical for both the initiation and stabilization of neurites.
- The affected proteases may be intracellular or distinct from exogenous thrombin/calpain.