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- W2007935985 abstract "Intraperitoneal or intraocular (io) injection of tubulin-binding drugs in goldfish, Carassius auratus L., inhibited axonal regeneration or restoration of functional synapses in optic axons following optic nerve crush. One eye was used to detect effects on regeneration and the other was kept intact to detect effects on maintenance of established optic circuits. Regeneration was assessed by measuring the time to reappearance of a visually evoked branchial suppression response. Three drugs, vincristine, vinblastine, and podophyllotoxin, administered semiweekly by ip injection, each inhibited regeneration at doses that did not impair maintenance of response. Similar results were previously reported for ip colchicine. Vincristine was several times more potent than podophyllotoxin or colchicine and 25 times more potent than vinblastine. Picropodophyllotoxin, an isomer of podophyllotoxin which has low affinity for tubulin, did not inhibit regeneration. The io experiments showed that maintenance of vision was reversibly inhibited by a single injection of 0.05 micrograms/g of colchicine but unaffected by 0.01 microgram/g, and that administration of the lower dose immediately following optic nerve crush inhibited regeneration. Intraocular lumicolchicine, a colchicine photoisomer which has low affinity for tubulin, did not inhibit maintenance or regeneration. In contrast, an io dose of vincristine sufficient to inhibit visual recovery also blocked maintenance of vision. Thus regeneration and maintenance effects could not be dissociated for io vincristine suggesting its mechanism of action on retinal cells is different. A conditioning lesion was shown to decrease the time to reappearance of the visually evoked branchial response following optic nerve crush, which indicates that it is a sensitive index of the rate of axonal outgrowth to the optic tectum." @default.
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- W2007935985 title "Comparative neurotoxicity of tubulin-binding drugs: Inhibition of goldfish optic nerve regeneration" @default.
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- W2007935985 doi "https://doi.org/10.1016/0041-008x(85)90088-2" @default.
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