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Application of either dopamine (DA), acetylcholine (ACh), or histamine (HA) to the identified ganglion cells of Aplysia elicits a K(+)-dependent slow hyperpolarization. When temperature of the bathing solution was raised from 22 to 32 degrees C, these cells were also hyperpolarized with a marked increase in K+ conductance. The warm- and transmitter-induced current responses recorded under voltage clamp were not blocked by either 1 mM Ba2+ or 10 mM TEA. Intracellularly injected guanosine 5'-O-(2-thiodiphosphate) (GDP beta S) depressed both warm- and transmitter-induced K+ responses immediately after the injection. Intracellular application of guanosine 5'-O-(3-thiotriphosphate) (GTP gamma S) caused a gradual, irreversible increase in K+ conductance of the plasma membrane and occluded both responses. Transmitter-induced response markedly decreased when the temperature was raised from 22 to 32 degrees C, suggesting that the response to transmitter was occluded during the warm-induced response. These results suggested that the G-protein regulating the receptor-operated K+ channels could be activated simply by raising temperature.

Potassium Ion Channels Operated bt Receptor Stimulation Can be Activated Simply by Raising Temperature.