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Related Experiment Videos

Cyclic nucleotide phosphodiesterases, insulin and thyroid hormones.

C Correze, R Auclair, J Nunez

    Molecular and Cellular Endocrinology
    |June 1, 1976
    PubMed
    Summary

    Insulin enhances phosphodiesterase activity in rat fat cells, particularly in hypothyroid models. This interaction affects cyclic AMP and cyclic GMP levels, with rapid effects observed at low insulin concentrations.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Biochemistry

    Background:

    • Insulin and thyroid hormones play crucial roles in regulating cellular metabolism.
    • Phosphodiesterases (PDEs) are key enzymes in signal transduction, controlling cyclic nucleotide levels.
    • Understanding the interplay between insulin and thyroid status on PDE activity is important for metabolic research.

    Purpose of the Study:

    • To investigate the in vitro effects of insulin on phosphodiesterase activities in rat epididymal fat cells.
    • To compare these effects in normal and hypothyroid rat models.
    • To elucidate the impact of insulin and hypothyroidism on cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) degradation.

    Main Methods:

    • Incubation of rat epididymal fat cells (normal and hypothyroid) with varying concentrations of insulin.

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  • Measurement of particulate and soluble phosphodiesterase activities (cyclic AMP and cyclic GMP).
  • Analysis of enzyme kinetics, including maximum velocity (Vmax) and apparent Michaelis constant (Km).

    • Main Results:

    • Insulin significantly increased the Vmax of particulate cyclic AMP phosphodiesterase, with a more pronounced effect in hypothyroid rats.
    • Insulin also stimulated soluble cyclic AMP and cyclic GMP phosphodiesterase activities, especially in hypothyroid conditions, showing additive effects with thyroidectomy.
    • These insulin-mediated effects on phosphodiesterase activity were rapid, occurring within minutes, and demonstrated a biphasic dose-response pattern.

    Conclusions:

    • Insulin enhances phosphodiesterase activity in rat fat cells, influencing cyclic nucleotide metabolism.
    • Hypothyroidism potentiates the effects of insulin on phosphodiesterase, suggesting an interaction between these hormonal states.
    • The findings indicate distinct mechanisms by which insulin and hypothyroidism modulate intracellular cyclic AMP and cyclic GMP degradation.