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The modulatory action of dopamine on crustacean fore gut neuro muscular preparations


, : The modulatory action of dopamine on crustacean fore gut neuro muscular preparations. Journal of Experimental Biology 94: 285-299

The modulatory effects of the putative crustacean neurohormone, dopamine (DA), on isolated neuromuscular preparations of the foregut of the crab, Cancer magister, and the spiny lobster, Panulirus interruptus, were investigated. Nanomolar concentrations of DA produced a dramatic enhancement of nerve-evoked contractions and, in certain muscles, contracture and spontaneous rhythmic contractions. These effects differed from the actions of serotonin and octopamine. The effects of DA could in part be explained by DA-produced increases in excitatory junctional potential amplitude, in muscle fiber resistance, and in some fibers, DA-produced depolarization and the activation of spontaneous rhythmic action potentials. The possibility of a presynaptic site of DA action was not excluded.

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