Summary
The cortical cell of the interrenal gland of the American bullfrog, Rana catesbeiana, was examined in the electron microscope. These cells occur in small groups and cords and are quite irregular in shape. The cortical cell is reminiscent of adrenal cortical cells from other vertebrates. Liposomes are variable in size and density. Smooth endoplasmic reticulum is scant in amount and predominantly of the fine tubular type. Mitochondria have vesicular cristae, a dense matrix, and occasionally have blebs, vacuoles, and myelin-like whorls at their surfaces. Intimate morphological relationships are found among the Golgi apparatus, lysosomes, and liposomes, and among Golgi vacuoles, mitochondria, and liposomes. In addition microfibrils are a prominent feature of the cortical cell. The biochemical events of steroidogenesis in amphibia and other vertebrates are discussed in relationship to the organellar interrelations found in the bullfrog interrenal cortical cells. Based on the available chemical and morphological information a scheme is proposed of movement of the steroidal intermediates through the cell that tentatively identifies the localizations of the various enzyme systems involved in corticosteroidogenesis from acetate to corticosterone and aldosterone.
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Supported in part by N.I.H. Grant RR 06138. Health Sciences Advancement Award.
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Volk, T.L. Ultrastructure of the cortical cell of the interrenal gland of the American bullfrog (Rana catesbeiana). Z. Zellforschung 123, 470–485 (1972). https://doi.org/10.1007/BF00335543
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DOI: https://doi.org/10.1007/BF00335543