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Confluent monolayers of cultured porcine thyroid cells transport fluid from the apical to the basal surface, forming circumscribed zones of detachment (domes) from the culture dish substrate. Fluid transport, as measured by increase in dome height, was stimulated by prostaglandin E₂ (PGE₂; 1 µmol/l) and inhibited by amiloride (0·1–100 µmol/l). Values of the inhibition constant (K_i) with 95% confidence limits for each of a series of amiloride analogues were: 3',4'-dichlorobenzamil (DCB), 0·090 (0·045–0·18) µmol/l; 2',4';-dimethylbenzamil (DMB), 0·14 (0·074–0·27) µmol/l; amiloride, 0·72 (0·33–1·8) µmol/l; 5-(N,N-hexamethylene)amiloride (HMA), 17 (5·9–43) µmol/l; 5-(N-ethyl-N-isopropyl)amiloride (EIPA), 33 (15–71) µmol/l; and 2-guanidinobenzimidazole, 243 (110–570) µmol/l. Triaminopyrimidine was ineffective at concentrations up to 1 mmol/l. Since DCB and DMB are known to have a higher affinity for Na⁺ channels, while HMA and EIPA show higher affinity for Na⁺/H⁺ antiports, it was concluded that PGE₂-stimulated fluid transport involved an apical membrane Na⁺ channel.

Journal of Endocrinology (1989) 123, 93–97