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Related Experiment Videos

Thyrotropin receptor-adenylate cyclase function in human thyroid neoplasms.

A R Saltiel, C H Powel-Jones, C G Thomas

    Cancer Research
    |June 1, 1981
    PubMed
    Summary

    Thyroid tumors show altered TSH binding sites but maintain normal adenylate cyclase function, suggesting cancer affects membrane structure rather than hormonal response.

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    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Oncology

    Background:

    • Thyrotropin (TSH) regulates thyroid function through plasma membrane receptors.
    • Understanding TSH action in malignant vs. normal thyroid tissue is key to hormonal regulation mechanisms.

    Purpose of the Study:

    • To investigate TSH binding and adenylate cyclase activity in human thyroid neoplasms compared to normal tissue.
    • To elucidate the impact of cancer on TSH receptor function and downstream signaling.

    Main Methods:

    • Collected thyroid plasma membranes from papillary/follicular carcinoma, adenoma, and adjacent normal tissue.
    • Assessed 125I-labeled TSH binding using Scatchard analysis.
    • Measured TSH-stimulated adenylate cyclase activity and basal activity.

    Main Results:

    • Normal thyroid tissue exhibits two TSH binding site affinities; tumors often retain high-affinity sites but have reduced low-affinity sites.
    • Adenylate cyclase responsiveness to TSH was largely preserved in tumors, with typically higher basal activity.
    • One carcinoma lacked TSH binding and stimulation, and its adenylate cyclase was unresponsive to prostaglandin.

    Conclusions:

    • TSH receptor-adenylate cyclase function may not correlate with the clinical behavior of thyroid carcinomas.
    • The absence of tumor regression is unlikely due to a lack of functional TSH receptors or adenylate cyclase.
    • Reduced low-affinity TSH binding in tumors might indicate broader cancer-related changes in membrane composition or structure.

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