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Long-term trophic effect of ACTH on rat adrenocortical cells

An ultrastructural, morphometric and autoradiographic study

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Summary

The changes occurring in rat adrenocortical cells (zona fasciculata) during an 8 day period of treatment with ACTH, were investigated by morphometric and autoradiographic methods.

The most important ultrastructural change consists in a conspicuous increase in the smooth endoplasmic reticulum, that accounts for about 50% of the total increase of cellular volume. Also the mitochondrial fraction shows a significant increase, which is found to be due both to the increment in the number of mitochondria per cell and to the increase in the mean volume of organelles themselves.

The quantitative autoradiographic data, indicating an increment in the incorporation of 3H-orotate and 3H-leucine into adrenocortical cells of the treated animals, allow us to conclude that the ACTH-induced ultrastructural changes are the morphological expression of a stimulation of the cellular protein synthesis.

Since mitochondria are largely autonomous in the synthesis of their enzymes and structural proteins, it is possible to hypothesize that ACTH also intervenes in the regulation of the mitochondrial protein synthesis.

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Authors and Affiliations

  1. Department of Anatomy of the University of Padua, Italy

    G. Nussdorfer, G. Mazzocchi & L. Rebonato

  2. Electron Microscopy Laboratory, Italy

    G. Nussdorfer, G. Mazzocchi & L. Rebonato

  3. Istituto di Anatomia Umana Normale, Via A. Gabelli, 37, I-35100, Padova, Italy

    G. Nussdorfer

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  1. G. Nussdorfer
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  2. G. Mazzocchi
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The authors wish to express their sincere appreciation to Mr. G. Gottardo for his excellent technical assistance.

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Nussdorfer, G., Mazzocchi, G. & Rebonato, L. Long-term trophic effect of ACTH on rat adrenocortical cells. Z. Zellforsch. 115, 30–45 (1971). https://doi.org/10.1007/BF00330212

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