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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The effect of biogenic monomines on rapid axonal transport in the rabbit optic nerve.

Since L-dopa and serotonin have been reported to increase the rate of axonal transport in rat sciatic nerve, we decided to study the effect of these monoamines on rapid orthograde transport in the rattit optic nerve. To do this, tritiated leucine was injected into the vitreous of both eyes of 56 albino rabbits, and arrival of radioactive labeled proteins at the superior colliculus was measured at various intervals by liquid scintillation counting. Rabbits were studied 24 hr after intraperitoneal injections of (1) Sinemet + L-dopa, (2) Sinemet + 5-hydroxytryptophan, or (3) pargyline. There were 14 rabbits in each group compared to 14 controls that received no monoamies. In the monoamine-treated groups, transported labeled proteins arrived at the superior colliculus earlier, and an increased amount of radioactivity accumulated during the next several hours. The maximum amount of radioactive proteins accumulating in drug-treated animals did not differ significantly from the maximum amount in control animals. As judged by autoradiographic densitometry, retinal ganglion cell synthesis was similar in control and drug-treated animals. We suspect that the rate of rapid axonal transport is increased by monoamines, although an increased rate of ganglion cell protein synthesis is another possibility.[1]


  1. The effect of biogenic monomines on rapid axonal transport in the rabbit optic nerve. Guy, J., Quigley, H.A., Anderson, D.R. Invest. Ophthalmol. Vis. Sci. (1978) [Pubmed]
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