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- W2085386833 abstract "A unitary, monosynaptic and presumably cholinergic EPSP recorded in cell R15 of the abdominal ganglion of Aplysia californica undergoes depression followed by facilitation when the presynaptic axon is repetitively stimulated at a rate of 1–3 pulses/sec. During trains of stimulation which produced this sequence of phenomena, the effects of a large number of agents known to affect cholinergic transmission in other systems were studied. The agents could be divided into 4 classes: (1) agents having no effect upon transmission at this cholinergic junction; (2) agents of a class typified by curare, which depressed all EPSPs of a train to the same extent, and which are believed to be acting in this system solely as competitive postsynaptic blockers; (3) agents typified by acetylcholine and carbachol (ACh class), which selectively depressed earlier EPSPs of a train more than later EPSPs and which appear to act by reducing the fractional release of transmitter; (4) agents typified by trimethidinium (trimethidinium class), which selectively depress later EPSPs of a train more than earlier EPSPs and which appear to act by reducing the rate of transmitter supply into the readily releasable pool. Neither the ACh class nor the trimethidinium class produced these selective effects on different pulses in the train by changes in the postsynaptic membrane potential or membrane resistance. Nor did they act by stimulating or inhibiting other recorded inputs onto R15. Iontophoretic application of acetylcholine onto R15 indicated that the effect of trimethidinium could not be explained by an alteration in desensitization of a postsynaptic acetylcholine receptor. The structural specificity of the presynaptic receptors mediating the action of the ACh and trimethidinium classes was demonstrated by the use of a large number of structurally related compounds." @default.
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- W2085386833 date "1975-05-01" @default.
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- W2085386833 title "Cholinergic agents affect two receptors that modulate transmitter release at a central synapse in Aplysia californica" @default.
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- W2085386833 doi "https://doi.org/10.1016/0006-8993(75)90657-5" @default.
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