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Effect of aldosterone on dome formation by MDCK mono-layer.

Effect of aldosterone on the dome formation in the reconstructed MDCK cell epithelia was studied. MDCK cells derived from dog kidney are assumed to be originated from distal tubules or collecting ducts. When cultured to a confluency, these cells formed a epithelial layer with many domes which contained fluid transported from the apical to the basolateral surface through this layer. Aldosterone at a concentration of 10(-8) to 10(-6) M increased the number of domes dose-dependently, probably through a receptor mediated process, since the dome formation induced by this hormone was completely abolished in the presence of spironolactone. This study primarily disclosed that the dome formation in MDCK cells was stimulated by aldosterone, probably through a receptor mediated mechanism.