Synaptic Transmission Depressed by Colchicine Blockade of Axoplasmic Flow

Science  10 Mar 1972:
Vol. 175, Issue 4026, pp. 1140-1142
DOI: 10.1126/science.175.4026.1140


Colchicine, which inhibits axoplasmic transport and induces organelle alterations in nerve terminals, was injected intraocularly in pigeons. Electrical stimulation of the optic nerve yielded normal evoked potentials in retinotectal fibers, whereas postsynaptic responses recorded in the tectum were reduced. Postsynaptic depression suggests a deficit of synaptic transmission, presumably dependent on colchicine interference with migrating material.