Abstract
Taxol is an antitumor compound which promotes assembly of microtubules in vitro . We report here that taxol promotes the initiation of microtubule assembly when injected into living eggs of Xenopus laevis . In unfertilized eggs injections of more than 0.50 ng of taxol induce microtubule formation into aster-like structures within 1 hr. This is accompanied by the formation of abnormal cleavage furrows. In fertilized eggs taxol arrests division in the injected blastomere of two- and four-cell embryos. Such arrested blastomeres contain asters and aster-like structures at higher taxol doses. The cleavage arrest caused by taxol injection was similar to the cytostatic activity of extracts from unfertilized eggs injected into embryos.
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