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Calbindin-D immunolocalization in developing chick thyroid: a light and electron microscopic study

N Inpanbutr and AN Taylor

Department of Anatomy, Baylor College of Dentistry, Dallas, Texas 75246.

Antiserum to calbindin-D, a 28 KD vitamin D-dependent calcium binding protein, was used to localize the protein immunocytochemically in developing chick thyroid by both light and electron microscopy. The protein first appeared in future follicular cells of developing thyroid tissue from 8-day-old embryos. The number of calbindin-D-containing cells increased rapidly to a near-plateau level at day 10; this concentration was sustained until day 15, and then declined to an undetectable level just before hatching. The protein was distributed throughout organelle-free areas of the follicular cell cytoplasm and extended into the nucleus; it was not present in the follicular colloid. Comparison of the time course of changes in calbindin-D content with known differentiative changes taking place in follicular cells suggests that the protein may function in some yet to be determined mechanism related to normal development of the thyroid.

Volume 37, Issue 4, pp. 487-492, 04/01/1989
Copyright © 1989 by The Histochemical Society


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