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Related Experiment Videos

Cell-cycle arrest in TrkA-expressing NIH3T3 cells involves nitric oxide synthase.

D A Bulseco1, W Poluha, C M Schonhoff

  • 1Department of Pharmacology and Molecular Toxicology, University of Massachusetts Medical School, Worcester, MA 01655, USA.

Journal of Cellular Biochemistry
|February 17, 2001
PubMed
Summary
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Nerve growth factor (NGF) triggers different responses in cells expressing its receptor, TrkA. Nitric oxide synthase (NOS) and p21(WAF1) are key to NGF-induced cell cycle arrest and morphological changes, not just MAPK activity.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Neuroscience

Background:

  • Nerve growth factor (NGF) is crucial for neuronal development and survival.
  • The NGF receptor, TrkA, mediates diverse cellular responses.
  • Understanding NGF signaling pathways is vital for neurobiology research.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying differential cellular responses to NGF.
  • To elucidate the roles of mitogen-activated protein kinase (MAPK) and nitric oxide synthase (NOS) in NGF signaling.
  • To identify key factors determining NGF-induced cell cycle arrest and morphological changes.

Main Methods:

  • Utilized two NIH3T3 cell lines (TRK1 and E25) engineered to express TrkA.
  • Assessed MAPK activity, NADPH-diaphorase staining for NOS activity, and bNOS isoform levels.

Related Experiment Videos

  • Quantified p21(WAF1) expression using Western blots and evaluated the effects of NOS inhibitors (L-NAME, D-NAME).

    • Main Results:

    • TRK1 cells, unlike E25 cells, exhibited cell-cycle arrest and process extension upon NGF stimulation.
    • NGF induced increased NOS activity, bNOS expression, and p21(WAF1) levels specifically in TRK1 cells.
    • NOS inhibition by L-NAME abolished NGF-induced cell-cycle arrest and morphological changes in TRK1 cells.
    • E25 cells showed morphological changes only when treated with both NGF and a nitric oxide donor.

    Conclusions:

    • Sustained MAPK activation is not the sole driver of NGF-induced cell-cycle arrest.
    • Nitric oxide (NO) plays a critical role in the signaling cascade leading to NGF-induced cell-cycle arrest and morphological differentiation.
    • The study implicates NOS and p21(WAF1) as crucial mediators of specific cellular responses to NGF in TrkA-expressing cells.