The endogenous neurosteroid Tetrahydrodeoxycorticosterone (THDOC) at physiological concentrations selectively enhances tonic currents mediated by αβδ receptors.
In hippocampus, 10 nM Tetrahydrodeoxycorticosterone reduces neuronal excitability by augmenting tonic αβδ receptor currents. In thalamocortical neurons, although 100 nM Tetrahydrodeoxycorticosterone enhances tonic currents, 10 nM Tetrahydrodeoxycorticosterone does not.