On the Identity of the Thyrotropic Cell in the Red-spotted Newt

Overview

Journal Cell Tissue Res

Specialties Anatomy & Histology
Cell Biology

Date 1976 Oct 19

PMID 825228

Citations 1

Authors

A D DUNN

J N DENT

Affiliations

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Abstract

Although the pars distalis of the red-spotted newt has previously undergone extensive cytological examination, the identity of its thyrotropic cells has remained uncertain. From the present ultrastructural study, cells of type 3 (Masur, 1969) containing granules 150-180 nm in diameter are concluded to be the thyrotropes. Such cells were found to be present in the regions of the pars distalis where thyroidectomy cells arise after ablation of the thyroid gland. Cells of type 3 are probably identical with a population of cells containing granules which stain with silver methenamine indicating the presence of a glycoprotein such as thyroid stimulating hormone (TSH). Thyroidectomy cells containing a few residual granules 150-180 nm in diameter were occasionally found in partes distales from newts killed 3 or 7 days after ablation of the thyroid gland, and were abundant in pituitaries 21 days after thyroidectomy. Only cells of type 3 responded (by vacuolation of granules) when animals were immersed in water containing 10 mug/1 of thyroxine. No cells of the pars distalis showed cytological change after administration of synthetic thyrotropic releasing hormone (TRH) giving additional support to the view that this hormone has no stimulatory role in amphibians.

Citing Articles

Localization of the pituitary lactotropes and thyrotropes within Ambystoma gracile by histochemical and immunochemical methods. A developmental study of two populations.

Eagleson G, McKeown B Cell Tissue Res. 1978; 189(1):53-66.

PMID: 352530 DOI: 10.1007/BF00223121.

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