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Related Experiment Videos

Cyclic GMP efflux from liver slices.

M L Tjörnhammar, G Lazaridis, T Bartfai

    The Journal of Biological Chemistry
    |June 10, 1983
    PubMed
    Summary

    This study identified two pathways for cyclic guanosine monophosphate (cGMP) efflux from liver cells: one sensitive to probenecid, suggesting a carrier system, and another likely due to passive diffusion, both crucial for managing intracellular cGMP levels.

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    Area of Science:

    • Hepatology
    • Cellular Physiology
    • Biochemistry

    Background:

    • Intracellular cyclic guanosine monophosphate (cGMP) plays a critical role in various cellular signaling pathways.
    • Understanding the mechanisms regulating intracellular cGMP levels is essential for comprehending liver function and disease.
    • Elevated cGMP levels can be induced by specific pharmacological agents, providing a model for studying efflux mechanisms.

    Purpose of the Study:

    • To investigate the mechanisms of cyclic GMP (cGMP) efflux from isolated liver cells.
    • To characterize the properties of the identified cGMP efflux systems, including their sensitivity to probenecid and temperature dependence.
    • To determine the contribution of cGMP efflux to the overall regulation of intracellular cGMP homeostasis.

    Main Methods:

    • Incubation of liver slices with agents that elevate intracellular cGMP levels, such as N-methyl-N'-nitro-N-nitrosoguanidine and 3-isobutyl-1-methylxanthine.
    • Quantification of cyclic GMP efflux using probenecid as a pharmacological tool to differentiate between transport systems.
    • Assessment of the effect of temperature and N-ethylmaleimide on the rate and characteristics of cGMP efflux.

    Main Results:

    • Two distinct systems for cyclic GMP efflux were identified: one probenecid-sensitive and another probenecid-insensitive.
    • The probenecid-sensitive efflux system appears to involve a saturable carrier mechanism, which can be modulated by alkylation.
    • The rate of net cyclic GMP efflux demonstrated a significant temperature dependency, increasing with temperature from 18 to 37 degrees C, with probenecid causing 50% inhibition.
    • The probenecid-insensitive efflux component is likely mediated by passive diffusion.

    Conclusions:

    • Cyclic GMP efflux from liver cells occurs via at least two distinct pathways.
    • The probenecid-sensitive carrier-mediated efflux system plays a significant role in cGMP removal from hepatocytes.
    • Efflux mechanisms, in conjunction with phosphodiesterase activity, are vital for maintaining cellular cyclic GMP homeostasis and preventing excessive accumulation.

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