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Related Experiment Videos

Cyclic nucleotides and cell growth.

W Seifert

    Journal of Supramolecular Structure
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Growth induction in fibroblasts involves a transient cyclic guanosine monophosphate (cGMP) peak. Transformed cells may have altered cGMP regulation at the cell cycle

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Molecular Biology

    Background:

    • Fibroblast growth is regulated by extracellular signals like serum and growth factors.
    • Cell cycle arrest (G0) and transition to growth involve changes in intracellular signaling molecules.
    • Cyclic nucleotides, specifically cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP), play crucial roles in cell regulation.

    Purpose of the Study:

    • To investigate the role of cGMP in fibroblast growth induction.
    • To compare cyclic nucleotide levels in normal and transformed fibroblasts during growth transitions.
    • To explore potential differences in guanylyl cyclase activity and cGMP regulation in transformed cells.

    Main Methods:

    • Measurement of intracellular cAMP and cGMP levels in fibroblast cultures under various growth conditions (growing, resting, serum-induced).

    Related Experiment Videos

  • Analysis of cyclic nucleotide changes in both normal (3T3) and transformed (SV3T3) fibroblast cell lines.
  • Assay of guanylyl cyclase activity in cell membranes.

    • Main Results:

    • Growth induction in resting fibroblasts triggers a rapid, transient cGMP peak.
    • The transition between growing and resting states is associated with significant changes in the cAMP/cGMP ratio.
    • Resting fibroblasts show a 2-5 fold decrease in cGMP compared to growing cells, with a 10-20 fold increase upon serum activation.
    • Transformed fibroblasts (SV3T3) exhibited no major cGMP changes during growth induction or under different conditions.
    • Guanylyl cyclase activity did not appear elevated in transformed cells under tested conditions.

    Conclusions:

    • A transient cGMP peak may signal growth induction in fibroblasts.
    • Characteristic changes in cAMP/cGMP ratios accompany and potentially drive the transition between growing and resting states.
    • Transformed cells might possess an altered guanylyl cyclase system or a dysregulated cGMP response mechanism, particularly at the restriction point of the cell cycle.