Simultaneous inhibition of contractile ring and central spindle formation in mammalian cells treated with cytochalasin B.

Abstract:

:In this work we have used the inhibitor of F-actin polymerisation cytochalasin B (Cyt B) to test the hypothesis that the contractile ring and the central spindle are mutually interdependent structures in mammalian mitotic cells. Double fluorescence staining of alpha-tubulin and F-actin was employed to analyse anaphase and telophase figures from asynchronously growing cultures and prometaphase-synchronised cells. Testing for the presence of the central spindle and contractile ring in human primary fibroblasts, human hepatoma cells and Chinese hamster cells after Cyt B treatment showed that both structures were simultaneously absent in over 60% of treated anaphases and 80% of telophases. Experiments on resumption of cytokinesis in cleavage-arrested cells further showed that Cyt B-treated human fibroblasts proceeded to cleavage within minutes after removal of the drug from the medium, concomitant with the re-formation of both cellular structures in cleaving cells. These data suggest that the presence of a correctly assembled contractile ring is essential for the formation and persistence of the central spindle during ana-telophase and provide further support for the idea of a strong co-operative interaction between these two structures during cytokinesis.

journal_name

Chromosoma

journal_title

Chromosoma

authors

Cimini D,Fioravanti D,Tanzarella C,Degrassi F

doi

10.1007/s004120050332

subject

Has Abstract

pub_date

1998-12-01 00:00:00

pages

479-85

issue

6-7

eissn

0009-5915

issn

1432-0886

journal_volume

107

pub_type

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