A Permeabilized Cell Model for Studying Cell Division: A Comparison of Anaphase Chromosome Movement and Cleavage Furrow Constriction in Lysed PtK1Cells

After lysis in a Brij 58-polyethylene glycol medium, PtK1cells are permeable to small molecules, such as erythrosin B, and to proteins, such as rhodamine-labeled FAB, myosin subfragment-1, and tubulin. Holes are present in the plasma membrane, and the mitochondria are swollen and distorted, but othe...

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Bibliographic Details
Published in:The Journal of cell biology 1981-03, Vol.88 (3), p.618-629
Main Authors: Cande, W. Zacheus, McDonald, Kent, Meeusen, Ronald L.
Format: Article
Language:English
Subjects:
Actins
Anaphase
B lymphocytes
Cells
Chromosomes
Cytochalasins
Cytoplasm
Microtubules
Mitotic spindle apparatus
Muscle spindles
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Summary:After lysis in a Brij 58-polyethylene glycol medium, PtK1cells are permeable to small molecules, such as erythrosin B, and to proteins, such as rhodamine-labeled FAB, myosin subfragment-1, and tubulin. Holes are present in the plasma membrane, and the mitochondria are swollen and distorted, but other membrane-bounded organelles of the lysed cell model are not noticeably altered. After lysis, the mitotic apparatus is functional; chromosomes move poleward and the spindle elongates. Cells lysed while in cytokinesis will continue to divide for several minutes. Addition of crude tubulin extracts, MAP-free tubulin, or taxol to the lysis medium retards anaphase chromosome movements but does not affect cleavage. On the other hand, N-ethylmaleimide-modified myosin subfragment-1, phalloidin, and cytochalasin B inhibit cleavage but have no effect on anaphase chromosome movements under identical lysis conditions. These results suggest that actomyosin plays no functional role in anaphase chromosome movement in mammalian tissue culture cells and that microtubule depolymerization is a rate-limiting step for chromosome-to-pole movements.
ISSN:0021-9525