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The Journal of Cell Biology, Vol 84, 131-140, Copyright © 1980 by The Rockefeller University Press

ARTICLES

Dynamics of nuclear actin bundle induction by dimethyl sulfoxide and factors affecting its development

Y Fukui and H Katsumaru

We have reported in a previous paper that dimethyl sulfoxide (DMSO) induces the formation of huge bundles of actin filaments in the nuclei of Dictyostelium mucoroides. The present study was performed to provide electron microscope data on the induction of nuclear actin bundles, illustrating both their formation and their reversion, as well as on the effects of various factors on the induction. The large nuclear bundles of actin appeared after 20--30 min of treatment with 10% DMSO. A DMSO concentration of 5 or 10% was optimal for the induction of the bundles. The nuclear actin bundle reverted to the original morphology within 5 min after removing DMSO. Induction of nuclear actin bundles was inhibited by Mg++ and low temperatures, but not by Na+, K+, Ca++, ATP, 3'5'-cyclic adenosine monophosphate (cAMP), phosphate buffer, or cytochalasin B. Neither NaN3 nor cycloheximide totally inhibited the induction of the bundles.
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