UMMS Affiliation

Department of Physiology

Publication Date

5-4-2000

Document Type

Article

Subjects

Animals; Cell Size; Cells, Cultured; Dynein ATPase; Kidney; Microinjections; Micromanipulation; Microtubules; Mitosis; Mitotic Spindle Apparatus; Nocodazole; Rats

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

In animal cells, positioning of the mitotic spindle is crucial for defining the plane of cytokinesis and the size ratio of daughter cells. We have characterized this phenomenon in a rat epithelial cell line using microscopy, micromanipulation, and microinjection. Unmanipulated cells position the mitotic spindle near their geometric center, with the spindle axis lying roughly parallel to the long axis of the cell. Spindles that were initially misoriented underwent directed rotation and caused a delay in anaphase onset. To gain further insight into this process, we gently deformed cells with a blunted glass needle to change the spatial relationship between the cortex and spindle. This manipulation induced spindle movement or rotation in metaphase and/or anaphase, until the spindle reached a proper position relative to the deformed shape. Spindle positioning was inhibited by either treatment with low doses of nocodazole or microinjection of antibodies against dynein, apparently due to the disruption of the organization of dynein and/or astral microtubules. Our results suggest that mitotic cells continuously monitor and maintain the position of the spindle relative to the cortex. This process is likely driven by interactions among astral microtubules, the motor protein dynein, and the cell cortex and may constitute part of a mitotic checkpoint mechanism.

Rights and Permissions

Citation: Mol Biol Cell. 2000 May;11(5):1765-74. Link to article on publisher's website

Related Resources

Link to Article in PubMed

Journal/Book/Conference Title

Molecular biology of the cell

PubMed ID

10793150

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