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Physiological evidence that light-mediated decrease in cyclic GMP is an intermediary process in retinal rod

W H Miller

    The Journal of General Physiology
    |July 1, 1982
    PubMed
    Summary
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    Intracellular cyclic GMP (cGMP) pulses depolarize retinal rod outer segments, with light antagonizing this effect via phosphodiesterase (PDE) activation. This suggests light-activated cGMP hydrolysis is key to visual transduction.

    Area of Science:

    • Vision science
    • Phototransduction
    • Cellular physiology

    Background:

    • Retinal rod outer segments (ROS) are crucial for dim light vision.
    • Cyclic GMP (cGMP) plays a vital role in the phototransduction cascade.
    • Understanding the precise role of cGMP hydrolysis in visual signaling is essential.

    Purpose of the Study:

    • To investigate the role of cyclic GMP (cGMP) in toad retinal rod outer segment (ROS) depolarization.
    • To elucidate the relationship between light, phosphodiesterase (PDE) activity, and the receptor potential.
    • To determine if cGMP hydrolysis is an intermediary in visual transduction.

    Main Methods:

    • Intracellular injection of cyclic GMP (cGMP) and cyclic AMP (cAMP) pulses into toad ROS.
    • Measurement of membrane potential changes in response to cGMP/cAMP pulses and light.

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  • Analysis of phosphodiesterase (PDE) activity kinetics in relation to light exposure and membrane voltage recovery.

    • Main Results:

    • cGMP injections caused transient depolarization of ROS, antagonized by light, indicating PDE activation.
    • PDE activity peaked after the receptor potential and its recovery time varied with light intensity.
    • cGMP pulses affected light response recovery, suggesting light-activated PDE controls the initial phase of the receptor potential.
    • EGTA and cGMP blocked the light response, but only cGMP altered latency, implying calcium's role is downstream of cGMP hydrolysis.

    Conclusions:

    • Light-activated hydrolysis of cyclic GMP (cGMP) is a critical intermediary process in visual transduction.
    • The kinetics of cGMP hydrolysis correlate with the initial phase of the light response.
    • Calcium's involvement in phototransduction is likely regulated by cGMP hydrolysis.