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. 1965 Jun 1;25(3):593–618. doi: 10.1083/jcb.25.3.593

CHANGES IN FINE STRUCTURE AND ACID PHOSPHATASE LOCALIZATION IN RAT THYROID CELLS FOLLOWING THYROTROPIN ADMINISTRATION

Bruce K Wetzel 1, Samuel S Spicer 1, Seymour H Wollman 1
PMCID: PMC2106689  PMID: 5839257

Abstract

Shortly after the administration of 1/40 unit thyrotropin to rats, 24 hours post-hypophysectomy, the following sequence of changes has been observed within thyroid follicular epithelial cells: (1) the appearance of apical cell surface activity consisting of pseudopods projecting into the follicular lumen; (2) apparent phagocytic engulfment of colloid droplets lacking indications of acid phosphatase activity; (3) close association and probable fusion of newly formed colloid droplets and dense granules, the latter cytochemically positive for acid phosphatase activity; (4) the appearance of presumptive acid phosphatase activity within colloid droplets; and, (5) further colloid droplet changes, viz., basipetal migration and decrease in size, accompanied by an increase in density and in demonstrable acid phosphatase activity. These changes appeared to represent the resorption and degradation of follicular colloid. Comparable results were obtained using intact and more heavily stimulated animals. Colloid biosynthesis was tentatively visualized in these cells as a separate mechanism involving small vesicles prominent in the Golgi region and beneath the apical plasma membrane of some, but not all, thyroid follicular cells in each specimen.

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Selected References

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