Abstract
Substance P (SP) produced membrane depolarization and decreased membrane conductance of mouse spinal cord neurons in primary dissociated cell culture. SP-responses were abolished by intracellular tetraethylammonium suggesting that SP decreased potassium conductance. Reversal of SP-responses was not observed with membrane hyperpolarization suggesting that SP reduced a voltage-dependent potassium conductance that was activated by membrane depolarization.
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