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Related Experiment Videos

Studies on synapse formation and opiate dependence.

M Nirenberg

    National Cancer Institute Monograph
    |May 1, 1978
    PubMed
    Summary

    NG108-15 cells develop a dependence on receptor activators like morphine, leading to increased adenylate cyclase activity and cAMP levels upon withdrawal. This highlights cellular adaptation to chronic receptor stimulation.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Pharmacology

    Background:

    • NG108-15 cells express opiate, alpha-adrenergic, and muscarinic acetylcholine receptors.
    • These receptors normally inhibit adenylate cyclase activity.

    Purpose of the Study:

    • To investigate the adaptive changes in adenylate cyclase activity in response to chronic receptor activation.
    • To determine if NG108-15 cells develop a dependence on receptor ligands.

    Main Methods:

    • Cells were grown in the presence of receptor activators (morphine, norepinephrine, acetylcholine) for 12-48 hours.
    • Adenylate cyclase activity and intracellular cAMP levels were measured before and after ligand withdrawal.

    Main Results:

    • Chronic exposure to receptor activators led to a compensatory increase in adenylate cyclase activity.
    • Withdrawal of receptor ligands resulted in sustained increases in adenylate cyclase activity and cAMP levels.

    Conclusions:

    • NG108-15 cells exhibit a form of dependence on receptor activators.
    • Cells adapt to chronic stimulation by upregulating adenylate cyclase to maintain normal cAMP levels.

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