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Differentiation-associated decrease in muscarinic receptor sensitivity in human neuroblastoma cells.

J E Heikkilä, I G Scott, L A Suominen

    Journal of Cellular Physiology
    |January 1, 1987
    PubMed
    Summary
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    Differentiation of SH-SY5Y neuroblastoma cells using TPA decreases muscarinic receptor sensitivity to calcium signaling. Agonist binding affinity remains unaffected, indicating a post-binding alteration in calcium mobilization.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Pharmacology

    Background:

    • Muscarinic receptors play crucial roles in neuronal function.
    • Intracellular calcium (Ca2+) signaling is vital for neurotransmission and cellular processes.
    • The human neuroblastoma cell line SH-SY5Y is a model for studying neuronal differentiation and signaling.

    Purpose of the Study:

    • To investigate the effects of differentiation on muscarinic receptor-mediated Ca2+ signaling in SH-SY5Y cells.
    • To determine if differentiation alters agonist binding affinity or downstream Ca2+ responses.

    Main Methods:

    • Measurement of intracellular free Ca2+ using quin-2.
    • Quantification of Ca2+ release from cell monolayers.
    • Induction of cell differentiation using 12-O-tetradecanoylphorbol-13-acetate (TPA).

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  • Assessment of agonist binding affinity via radiolabeled antagonist displacement assays (3H-NMS).

    • Main Results:

    • Differentiation with TPA reduced the sensitivity of SH-SY5Y cells to muscarinic receptor agonists.
    • This decreased sensitivity was observed in both the increase in cytosolic free Ca2+ and Ca2+ efflux.
    • No significant change in agonist binding affinity was detected, as evidenced by 3H-NMS displacement assays.

    Conclusions:

    • Cellular differentiation alters muscarinic receptor signaling downstream of ligand binding.
    • The observed decrease in sensitivity is likely due to post-receptor modifications affecting Ca2+ mobilization pathways.
    • SH-SY5Y cells provide a valuable model for dissecting differentiation-induced changes in neuronal signaling.