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Distribution and Structure of the Adrenocortical Homolog in Polypterus palmas Ayres

Acta Zoologica, ISSN: 1463-6395, Vol: 66, Issue: 3, Page: 131-143
1985
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The identity, distribution and structure of the adrenocortical homolog (AH) was made in Polypterus palmas Ayres using routine light and electron microscopy and histochemistry for the enzyme δ‐3β‐hydroxysteroid dehydrogenase (3β‐HSD). The AH is confined to yellow corpuscles which are positioned near the posterior cardinal and renal veins in the anterior two‐thirds of each kidney. The 46–57 spherial to cigar‐shaped corpuscles are placed end to end and are equally distributed in the kidneys. The tortuous cords of epithelial cells of each corpuscle are surrounded by sinusoids and are completely delimited from the haemopoietic and renal tissue of the kidneys. The steroidogenic nature of the cells is demonstrated by their 3β‐HSD activity and their ultrastructure, namely lipid droplets, tubular smooth endoplasmic reticulum and mitochondria with tubulovesicular cristae. Giant mitochondria and gap junctions are notable features of AH cells in this fish. The yellow corpuscles of the kidneys in P. palmas represent the AH and this tissue has a distribution which is in accordance with the taxonomic position of Polypteriformes. 1985 The Royal Swedish Academy of Sciences

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