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Related Experiment Videos

Receptor mediated action without receptor occupancy.

W H Fletcher, J R Greenan

    Endocrinology
    |April 1, 1985
    PubMed
    Summary
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    Human chorionic gonadotropin (hCG) binding to ovarian granulosa cells triggers intracellular actions. This hormone-induced cell signaling can be communicated to neighboring cells lacking receptors, amplifying the response.

    Area of Science:

    • Reproductive Endocrinology
    • Cell Signaling
    • Molecular Biology

    Background:

    • Cell surface receptors mediate cellular responses to external stimuli.
    • Understanding receptor-ligand interactions is crucial for cellular communication.
    • Ovarian granulosa cells play a key role in reproductive processes.

    Purpose of the Study:

    • To investigate the direct relationship between receptor occupancy and cellular action in ovarian granulosa cells.
    • To determine if receptor-mediated events can be communicated to cells lacking specific receptors.

    Main Methods:

    • Exposure of ovarian granulosa cells to human chorionic gonadotropin (hCG).
    • Identification of hCG-bound receptors using immunocytochemistry and autoradiography.
    • Monitoring of cAMP-dependent protein kinase dissociation via direct cytochemistry.

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    Main Results:

    • Only 25-30% of granulosa cells bound hCG, leading to protein kinase dissociation in those cells.
    • Cells without hCG receptors dissociated protein kinase upon contact with hormone-bound cells.
    • Cells lacking receptors and not in contact with bound cells showed no protein kinase dissociation.

    Conclusions:

    • Establishes a direct link between receptor occupancy and receptor-mediated action within individual cells.
    • Demonstrates intercellular communication of receptor-mediated events to receptorless cells, likely via gap junctions.
    • Suggests a mechanism for amplifying hormonal responses in tissues with interconnected cells.