Abstract

In whole-cell recordings on Ehrlich–Lettre-ascites tumour (ELA) cells, the shrinkage-induced activation of a cation conductance with a selectivity ratio P Na: P Li: P K: P choline: P NMDG of 1.00:0.97:0.88:0.03:0.01 was observed. In order of potency, this conductance was blocked by Gd 3+=benzamil>amiloride>ethyl-isopropyl-amiloride (EIPA). In patch-clamp studies using the cell-attached configuration, a 14 pS channel became detectable that was reversibly activated upon hypertonic cell shrinkage. It is concluded that ELA cells express a shrinkage-induced cation channel that may reflect a molecular link between amiloride-sensitive and -insensitive channels. In addition, because of its pharmacological profile, it may possibly be related to epithelial Na + channels (ENaCs).

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