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  • Title: The nature of thyrotropin stimulation of thyroid function in Japanese quail: prolonged thyrotropin exposure is necessary to increase thyroidal 125I uptake.
    Author: McNabb FM, McNichols MJ, Slack PM.
    Journal: Comp Biochem Physiol A Comp Physiol; 1986; 85(3):459-63. PubMed ID: 2878775.
    Abstract:
    Single injections of thyrotropin (TSH) increase serum T4 and thyroidal 32P uptake but not thyroidal 125I uptake regardless of dosage, exposure time or age. Chronic TSH exposure, with 3 or more days of injection, does increase thyroidal 125I uptake. Studies using iodine (I) supplementation indicated that the increased thyroidal radioiodine uptakes seen with chronic TSH administration were not due to an I deficiency in the thyroid resulting from high hormone release. Labeled and unlabeled experiments comparing the effects of single vs. multiple injections of TSH were used to describe the effects of TSH on hormone release, hormone production and thyroidal I uptake.
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