Summary
The duck interrenal cell possesses ultrastructural characteristics common to other steroid-secreting cells. Lipid droplets and mitochondria are abundant and lie principally at the apical end of the cell. Lipid droplets are not membrane-limited. Cisternae of smooth endoplasmic reticulum that are occasionally continuous with the less abundant rough endoplasmic reticulum are a prominent feature of the interrenal cell. Tubular profiles of rough endoplasmic reticulum often lie tangentially to mitochondria and ribosomes are either free, grouped in polyribosomal clusters, or bound to the endoplasmic reticulum. Mitochondria possess tubular cristae in the inner regions of the gland and frequently contain a paracrystalline array of small 10nm (o.d.) tubules and less frequently a hexagonal array of 40nm trilaminar rings. Other cytoplasmic components include dense bodies, residual bodies, microtubules, microfilaments and specialized single membrane-bound vesicles. Gap junctions, intermediate junctions and interdigitating processes constitute the main intercellular associations. No tight junctions were identified.
The single membrane-bound vesicles which are occasionally filled with a low electron-dense, lipid-like material form septate-like “junctions” with the plasma membrane. The septa bridge an intracellular gap of 15–17 nm. The vesicles are usually located near the subendothelial space at the basal and basilateral regions of the cell. Occasionally, vesicles fuse with the plasma membrane. It is suggested that these vesicles represent morphological evidence for the exocytotic release of steroid hormones.
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This work was supported by a grant (BMS 74-23174) to J. Cronshaw and W.N. Holmes from the National Science Foundation, Washington, D.C. The authors are grateful to Mrs. Ilene Hames for her assistance in the preparation of this manuscript
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Pearce, R.B., Cronshaw, J. & Holmes, W.N. The fine structure of the interrenal cells of the duck (Anas platyrhynchos) with evidence for the possible exocytotic release of steroids. Cell Tissue Res. 183, 203–220 (1977). https://doi.org/10.1007/BF00226620
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DOI: https://doi.org/10.1007/BF00226620