, Volume 29, Issue 1, pp 88–117 | Cite as

In situ analysis of normal and abnormal patterns of the mitotic apparatus in cultured rat-kangaroo cells

  • Waheeb K. Heneen


Dividing cells in monolayers of the rat-kangaroo (Potorous tridactylis) cell line Pt-K1 have large spindles and are flat, thus making possible studies of interactions between the achromatic and chromatic parts of the mitotic apparatus during the cell cycle. At prophase, asters and centrioles seem to exert pressure on the nuclear membrane leading to its rupture and penetrance of the centrioles. Apparently, the long axis of the spindle is shorter than the nuclear diameter. What appears as persistent, large portions of the nuclear membrane were observed in some metaphase and anaphase cells. Such a condition might also indicate an arrested mitosis. The midbody, which was often bipartite, was found to be of a ribonucleoprotein nature. — Three-group metaphases were of common occurrence and might represent early stages of chromosome orientation preceding the final alignment of the chromosomes on the equatorial plate. They could also be an expression of an anomalous condition as a result of mitotic arrest during prometaphase owing to spindle inactivation or breakage, errors in centromere-spindle attachments, interference with chromosome movement, or a duplicated centriolar constitution. Most of these aberrations could be attributed to the flatness of dividing cells, which might also bring about the failure of centriole separation and spindle organization in prometaphase stages, as well as multipolar mitosis.De novo organization of half spindles might take place in cells with ruptured spindles. Anaphase cells showing signs of a previous three-group orientation were rare. — Multipolar mitoses were prevalent mainly in cells with high chromosome numbers. They were often star-shaped with the chromosomes oriented between opposite and adjacent poles, and rarely as end-to-end associations of spindles. Apparently, one or more centrioles might share a common polar region. Multipolar configurations have either a mono- or multinuclear origin. Nuclei usually enter division synchronously in binucleate cells and the spindles become organized between centrioles associated with individual or different nuclei.


Mitotic Arrest Binucleate Cell Chromosome Movement Mitotic Apparatus Nuclear Diameter 
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Copyright information

© Springer-Verlag 1970

Authors and Affiliations

  • Waheeb K. Heneen
    • 1
  1. 1.Institute of GeneticsUniversity of LundSweden

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