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Cytochrome P-45011 beta and P-450scc in adrenal cortex: zonal distribution and intramitochondrial localization by the horseradish peroxidase-labeled antibody method

F Mitani, T Shimizu, R Ueno, Y Ishimura, S Izumi, N Komatsu and K Watanabe

In an attempt to elucidate the regulation mechanism(s) of adrenocortical steroidogenesis, cytochrome P-450scc and cytochrome P- 45011 beta were localized in bovine adrenal glands by the direct peroxidase-labeled antibody method. At the light microscopic level, parenchymal cells of the zona fasciculata and the zona reticularis stained heavily for both cytochromes, while the parenchymal cells of zona glomerulosa stained lightly for both. At the electron microscopic level, these two cytochromes were associated with the matrix side of the inner mitochondrial membranes of parenchymal cells from all three zones of the adrenal cortex. The association of cytochrome P-450 with the inner mitochondrial membrane, in a manner similar to that previously reported for adrenodoxin and adrenodoxin reductase (F Mitani, Y Ishimura, S Izumi, K Watanabe, Acta Endocrinol 90:317, 1979), establishes that the steroid monooxygenase systems exist at this site. The degree of immunocytochemical staining within a single cell varied from one mitochondrion to another: some stained intensely along the entire inner membrane, including the cristae, some stained only along segments of the inner membrane, and some did not stain at all. This heterogeneity in staining was observed in mitochondria stained in situ as well as in isolated mitochondria. These findings suggest that there is a heterogeneity in steroidogenesis among mitochondria contained within a single cell of the adrenal cortex.

Volume 30, Issue 10, pp. 1066-1074, 10/01/1982
Copyright © 1982 by The Histochemical Society


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