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Synthesis and storage in rat thyroid C-cells

GA Thomas, E Neonakis, HG Davies, MH Wheeler and ED Williams

Department of Histopathology, University of Cambridge, Addenbrooke's Hospital, United Kingdom.

Thyroid C-cells have the capacity to produce a variety of peptides, as do C-cell tumors. The cellular content of one such peptide, somatostatin, is restricted to a minority of C-cells in rat and human. We set out to clarify whether the synthesis of somatostatin is equally restricted and to study changes that occur in somatostatin synthesis with age. We used immunocytochemistry to localize somatostatin and calcitonin in conjunction with in situ hybridization, using digoxigenin- labeled oligoprobes to localize somatostatin and calcitonin mRNAs in serial sections of formalin-fixed, paraffin-embedded rat thyroid, and correlated peptide and mRNA content in individual cells. All C-cells synthesize and store calcitonin, and somatostatin synthesis, as shown by mRNA content, is limited to the subset of cells containing immunoreactive somatostatin. The numbers of C-cells in general and of the subset synthesizing somatostatin increase between juvenile and adult animals, but the somatostatin cells remain confined to a small area of the gland. These findings support the proposal that somatostatin production is not facultative, but that C-cells differentiate into two distinct subsets of cells, only one of which synthesizes and stores somatostatin.

Volume 42, Issue 8, pp. 1055-1060, 08/01/1994
Copyright © 1994 by The Histochemical Society


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Immunocytochemical Localization of Prohormone Convertases PC1 and PC2 in the Mouse Thyroid Gland and Respiratory Tract
J. Histochem. Cytochem., July 1, 2002; 50(7): 903 - 910.
[Abstract] [Full Text] [PDF]



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