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Patterns of membrane organization in toad bladder epithelium: A freeze-fracture study

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  • Anatomica, Histologica, Embryologica, Carcinologica
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Summary

Two cell-types of toad bladder epithelium show uncommon plasma membrane organization in freeze-fractured specimens. One type, the granular cell, contains a plasma membrane in which the A-face is poorly particulate luminally while the B-face discloses multiple large particles at this site. In contrast, the lateral and basal portions of the granular-cell membrane are typical in that more particles occupy the A-face than the B-face. In the other cell-type, which is mitochondriarich, the plasma membrane, luminally, laterally, and basally, contains rod-shaped and a few glubular particles in the A-face. We suggest that these two peculiar membrane organizations by considered in the localization of both vasopressin and aldosterone action in toad bladder.

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Some of these results were presented in abstract form at the 6th annual meeting of the Swiss Societies for Experimental Biology, Lausanne, 11–12, May 197421

The authors are indebted to Mrs.Marthe Sidler-Ansermet, Mrs.Gorana Perrelet, MissMariella Ravazzola and Mr.Michel Bernard for valuable assistance.

This work was supported in part by grants No. 3.0311.73, 3.8081.72, 3.553.75 and 3.1300.73 from Fonds National Suisse de la Recherche Scientifique, Bern, Switzerland, and by a grant-in-aid from Hoechst-Pharmaceuticals (Frankfurt-Hoechst, W. Germany).

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Orci, L., Humbert, F., Amherdt, M. et al. Patterns of membrane organization in toad bladder epithelium: A freeze-fracture study. Experientia 31, 1335–1338 (1975). https://doi.org/10.1007/BF01945814

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