PMID: 6109004Nov 1, 1980Paper

Axonal transport of the molecular forms of acetylcholinesterase in chick sciatic nerve

Journal of Neurochemistry
J Y Couraud, L Di Giamberardino

Abstract

Acetylcholinesterase (AChE) polymorphism was studied in the sciatic nerve of 4-week-old Leghorn chicks, by sucrose gradient sedimentation analysis. Four main AChE molecular forms were found with sedimentation coefficients of 5S, 7.5S, 11.5S and 20S respectively. Axonal transport of each of these forms was investigated on the basis of the enzyme accumulation kinetics measured on both sides of nerve transections and of the enzyme redistribution kinetics in nerve segments isolated in vivo. After nerve transection, 11.5S and 20S forms accumulated faster in the anterograde than in the retrograde direction and also much faster than 5S and 7.5S forms in the anterograde direction. Retrograde accumulations of 5S and 7.5S were faint or negligible. In addition, 1 h after nerve cutting, the accumulation rates for 11.5S and 20S forms (but not for 5S and 7.5S) fell, in both directions, to about one-third of their initial values, probably owing to reversal of axonal transport at the axotomy site. Local protein synthesis inhibition by cycloheximide did not affect the accumulation of 11.5S and 20S in front of a transection, at least during the first hours, but reduced that of 5S and 7.5S by about 40%. In isolated nerve segments in vivo, the rap...Continue Reading

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