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Related Experiment Videos

Nerve growth factor-induced decrease in the calpain activity of PC12 cells.

M Oshima1, S Koizumi, K Fujita

  • 1Section on Growth Factors, National Institute of Child Health and Human Development, Bethesda, Maryland 20892.

The Journal of Biological Chemistry
|December 5, 1989
PubMed
Summary
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Nerve growth factor (NGF) treatment decreases calpain activity in differentiating PC12 cells. This reduction is linked to increased calpastatin activity, the calpain inhibitor, suggesting a key regulatory mechanism.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • PC12 cells, derived from rat pheochromocytoma, are a model for neuronal differentiation.
  • Nerve growth factor (NGF) induces differentiation, characterized by neurite outgrowth.
  • PC12 cells possess calpain I and calpain II, with calpain II being the predominant form.

Purpose of the Study:

  • To investigate the effect of NGF on calpain activity in differentiating PC12 cells.
  • To explore the role of calpastatin in regulating calpain activity during NGF-induced differentiation.

Main Methods:

  • PC12 cells were treated with NGF, fibroblast growth factor, or dibutyryl cyclic AMP.
  • Calpain activity was measured in cell extracts.
  • Calpastatin levels and inhibitory activity were assessed using chromatography and immunoblotting.

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Main Results:

  • NGF treatment led to a time-dependent decrease in calpain activity (>50% over 5 days).
  • Neurite outgrowth and reduced calpain activity were reversible upon NGF removal.
  • Other neurite-inducing agents also decreased calpain activity.
  • Calpain protein levels remained unchanged, but calpastatin's inhibitory activity increased.

Conclusions:

  • NGF induces differentiation in PC12 cells, accompanied by a significant reduction in calpain activity.
  • The decrease in calpain activity is mediated by an increase in the inhibitory function of calpastatin.
  • This suggests calpastatin plays a crucial role in regulating calpain during NGF-driven neuronal differentiation.