slo3

Quinine is a natural cinchona alkaloid that has been used for centuries in the prevention and therapy of malaria. Quinine is also used for idiopathic muscle cramps. Quinine therapy has been associated with rare instances of hypersensitivity reactions which can be accompanied by hepatitis and mild jaundice.

RU1968 bis-TFA salt is an inhibitor of the sperm-specific Ca2+ channel CatSper, thereby inhibiting human Slo3 with about 15-fold lower potency than CatSper.

Quinine hemisulfate hydrate, an alkaloid extracted from the cinchona tree bark, serves as an anti-malarial agent and potassium channel inhibitor. It specifically targets and inhibits WT mouse Slo3 (K Ca 5.1) channel currents induced by voltage pulses to +100 mV, having an IC 50 value of 169 μM [1] [2].

VU 0546110, a selective inhibitor of the sperm-specific potassium channel SLO3 (IC50= 64 μM), demonstrates 40-fold selectivity over SLO1. It effectively blocks both heterologous SLO3 currents and endogenous K+ currents, inhibiting sperm hyperpolarization and preventing hyperactivated mobility.