Abstract
Cytochalasin B (1 μg/ml) completely inhibited the evagination of isolated leg imaginal discs cultured in vitro in a synthetic medium (ME) containing α-ecdysone (3 μg/ml). In discs precultured for 6 hr in medium ME without the drug, then transferred to cytochalasin B-containing medium, continuation of evagination was stopped immediately. The inhibition of evagination was completely reversible, provided pretreatment with cytochalasin B did not exceed 8 hr. Results are discussed in view of what is known on the effect of cytochalasin B on other developmental systems. Findings are compatible with the primary action of the drug being an alteration of cell surface properties, thus bringing to light the importance of these properties in the course of normal imaginal disc evagination.
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