Summary
In a human medullary carcinoma of thyroid gland containing calcitonin in light microscopic demonstration by the avidin biotin complex (ABC) method characteristic secretory granules were found electron microscopically in the cytoplasm of the tumour cells. They consisted in so-called type I granules (270±25 nm) and type II granules (135±17 nm). By the immuno gold staining (IGS) method the content of many secretory granules measuring 85–270 nm (152±18 nm) in diameter could be identified as calcitonin. These granules seemed to be predominantly of type II because of their nearly corresponding size and feature. The type I grnaules were less frequent in number and they showed no or little immunoreactivity. The results indicate that the IGS-method is practicable to demonstrate the ultrastructural localization of calcitonin and to identify clearly the nature of intracytoplasmic granules in electron microscopy.
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Dämmrich, J., Ormanns, W. & Schäffer, R. Electron microscopic demonstration of calcitonin in human medullary carcinoma of thyroid by the immuno gold staining method. Histochemistry 81, 369–372 (1984). https://doi.org/10.1007/BF00514331
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DOI: https://doi.org/10.1007/BF00514331