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CSK negatively regulates nerve growth factor induced neural differentiation and augments AKT kinase activity

Nandini Dey1, Brian W Howell, Pradip K De

  • 1Section of Pediatric Hematology/Oncology, Department of Pediatrics, AFLAC Cancer Center and Blood Disorders Services, Emory University School of Medicine, Atlanta, GA 30022, USA.

Experimental Cell Research
|May 14, 2005
PubMed

Insights

C-terminal SRC kinase (CSK) regulates neuronal differentiation by controlling Src family kinases (SFKs). Inhibiting CSK promotes neurite outgrowth, while its overexpression hinders it, revealing SFKs

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Neuroscience

Background:

  • Src family kinases (SFKs) are crucial for growth factor signaling in cell differentiation and proliferation.
  • C-terminal SRC kinase (CSK) regulates SFK activity via C-terminal tyrosine phosphorylation.
  • The specific roles of CSK and SFKs in neuronal differentiation remain largely uncharacterized.

Purpose of the Study:

  • To investigate the role of CSK and specific SFKs in nerve growth factor (NGF)-induced neuronal differentiation in PC12 cells.
  • To elucidate the signaling pathways regulated by CSK during neuronal differentiation.

Main Methods:

  • PC12 cells were treated with the SFK inhibitor PP1.
  • Active and catalytically dead CSK were overexpressed in PC12 cells.
  • NGF-induced activation of SFKs (FYN, YES), RAS, ERK, RAC, and AKT were assessed.
  • Neurite outgrowth and cell migration were measured.

Main Results:

  • PP1 treatment inhibited NGF-induced SFK activation and neurite outgrowth.
  • Overexpression of active CSK inhibited NGF-induced activation of FYN, YES, RAS, ERK, RAC, and neurite outgrowth.
  • Active CSK overexpression augmented NGF-stimulated AKT activation.
  • Kinase-dead CSK overexpression enhanced FYN, RAS, ERK activation, and increased neurite outgrowth.

Conclusions:

  • CSK plays a critical role in regulating NGF/TrkA signaling pathways, including RAS, RAC, ERK, and AKT.
  • CSK differentially controls SFKs to orchestrate neuronal differentiation.
  • Targeting CSK may offer a therapeutic strategy for modulating neuronal differentiation.

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