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Related Experiment Videos

Second-messenger generation in PC12 cells. Interactions between cyclic AMP and Ca2+ signals.

G Gatti1, L Madeddu, A Pandiella

  • 1Department of Pharmacology, CNR Center of Cytopharmacology and Scientific Institute S. Raffaele, University of Milano, Italy.

The Biochemical Journal
|November 1, 1988
PubMed
Summary

This study investigates cyclic AMP (cAMP) signaling in PC12 cells, revealing how adenosine and muscarinic/alpha-adrenergic receptors modulate cAMP levels. Pertussis toxin blocks inhibitory pathways, highlighting G-protein involvement in neurotrophin-differentiated cells.

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Area of Science:

  • Neuroscience
  • Cell Signaling
  • Biochemistry

Background:

  • PC12 pheochromocytoma cells are a model for neuronal differentiation.
  • Cyclic AMP (cAMP) is a crucial second messenger involved in various cellular processes.
  • Understanding receptor-mediated signaling pathways is key to deciphering cellular responses.

Purpose of the Study:

  • To investigate the effects of various receptor activators and blockers on cyclic AMP (cAMP) concentrations in PC12 cells.
  • To elucidate the roles of adenosine, muscarinic, and alpha-adrenergic receptors in modulating cAMP levels.
  • To examine the influence of nerve growth factor (NGF)-induced differentiation on these signaling pathways.

Main Methods:

  • Treatment of PC12 cells with specific receptor agonists and antagonists.

Related Experiment Videos

  • Measurement of intracellular cyclic AMP (cAMP) concentrations.
  • Assessment of cytosolic Ca2+ concentration ([Ca2+]i) changes.
  • Use of pertussis toxin and phorbol ester to probe signaling mechanisms.
  • Comparison between growing and NGF-differentiated PC12 cells.

    • Main Results:

    • N-(L-2-phenylisopropyl)adenosine increased cAMP, while carbachol and clonidine decreased it.
    • Muscarinic and alpha-adrenergic inhibitions of cAMP were pertussis toxin-sensitive.
    • Phorbol ester decreased resting cAMP and potentiated adenosine-induced increases.
    • NGF differentiation generally maintained these signaling patterns, albeit to a lesser extent.
    • Receptor activation did not alter resting [Ca2+]i, but modulated carbachol-induced [Ca2+]i transients.

    Conclusions:

    • Receptor activation in PC12 cells elicits diverse cAMP responses, modulated by NGF differentiation.
    • Pertussis toxin-sensitive G-proteins mediate inhibitory signaling via muscarinic and alpha-adrenergic receptors.
    • Distinct intracellular signaling pathways regulate cAMP and Ca2+ dynamics in response to receptor stimulation.