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• W1575274357 abstract "We have tried to identify iodinated thyroglobulin molecules in purified thyroid-coated vesicles to determined whether the internalization of the thyroid prohormone could proceed via a mechanism of receptor-mediated endocytosis. Coated vesicles isolated from pig thyroids by differential centrifugation and centrifugation on 2H2O-sucrose cushion were characterized by transmission electron microscopy and analyses of the polypeptide composition by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate and Western blot using anti-clathrin heavy chain and anti-thyroglobulin antibodies. Clathrin and thyroglobulin (Tg) appeared as the two major components of the purified thyroid coated vesicles (TCV). Purified TCV fraction was homogeneous when analyzed by isopycnic centrifugation on 30% Percoll gradient. TCV had an apparent buoyant density of 1.035 g/ml. The presence of Tg molecules inside TCV was ascertained by (a) immunogold labeling on cryosections of TCV pellet and (b) identification by gel electrophoresis and radio-immunoassay of a definite fraction of Tg (3-5% of total protein) in TCV treated by Triton X-100. The detergent-treated TCV also contained protein-bound iodine: 0.5-0.7 micrograms of iodine/mg protein. Pulse-chase experiments on in vitro reconstituted thyroid follicles have been used to further document the presence of iodinated Tg molecules in coated vesicles. TCV were isolated from reconstituted thyroid follicles previously labeled with [125I]iodide to radioiodinate Tg of the follicular lumen (the pre-endocytotic compartment) and incubated with or without thyrotropin or dibutyryl cyclic AMP to activate intraluminal 125I-Tg endocytosis. Autoradiographic analyses revealed the presence of 125I-Tg in purified TCV and Triton X-100-treated TCV. 125I-Tg present in TCV represented 1-2% of the total intracellular protein-bound radioactivity. Thyrotropin and dibutyryl cyclic AMP increased 2-3-fold the 125I-Tg content of TCV. Our results clearly show that iodinated Tg, the molecular form of the thyroid prohormone known to be internalized, is present into TCV. The data suggest that coated vesicles are involved in the uptake and transport of Tg from the follicular lumen to the lysosomal compartment and therefore, that the internalization of Tg could proceed, at least for a part, via a mechanism of receptor-mediated endocytosis." @default.
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• W1575274357 date "1990-10-01" @default.
• W1575274357 modified "2023-10-17" @default.
• W1575274357 title "Coated vesicles from thyroid cells carry iodinated thyroglobulin molecules. First indication for an internalization of the thyroid prohormone via a mechanism of receptor-mediated endocytosis." @default.
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• W1575274357 doi "https://doi.org/10.1016/s0021-9258(17)44912-x" @default.
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