Correlation between thyroid-follicle fusion and structural modifications of the epithelial cells |
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Authors: | C Penel P Bastiani J B Rognoni |
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Institution: | (1) Laboratoire d'Endocrinologie Cellulaire, Université de Provence, Marseille, France;(2) Laboratoire d'Endocrinologie Cellulaire, Université de Provence, 3, Place Victor-Hugo, 13331 Marseille Cedex 3, France |
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Abstract: | Summary Changes in thyroid structure induced by a decrease in TSH or iodide-dependent stimulation were quantified by stereological analysis of light micrographs. Studies were carried out on intact (R5) and hypophysectomized (R 5H) rats receiving 5 g iodide, and on intact rats (R5O) receiving 50 g iodide daily.For R 5H- and R5O-thyroids, the mean parameters of the epithelial cells, height, volume and lateral membrane area, were smaller than those of R 5-thyroids. An inverse shift was observed for the apical membrane area, whereas the peripheral membrane area was unchanged. The number of epithelial cells was similar in each of the three groups; however, the number of follicles was greater in R 5-thyroids, suggesting that follicular fusion occurs in R 5O- and R 5H-thyroids. This was confirmed by direct observation.The present results demonstrate that in adult rats a lack of TSH or an increased iodide diet (insufficient to produce a physiopathological state) induce follicle fusion probably by means of cellular reorganization. This increase in follicle size could be involved in the regulation of thyroid iodine turnover. |
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Keywords: | Thyroid reorganization Iodide TSH Stereology |
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