Summary
We irradiated chromosomal spindle fibres in crane-fly spermatocytes with an ultraviolet microbeam of 270 nm wavelength light with total energies near those that cause actin filaments in myofibrils to depolymerize; after irradiation we stained the cells with rhodamine-labelled phalloidin and with anti-tubulin antibodies. In some cells, the irradiation reduced both phalloidin and tubulin staining of the chromosomal spindle fibres; in other cells, the irradiations reduced phalloidin staining but not tubulin staining; in yet other cells, the irradiations reduced tubulin staining but not phalloidin staining. In all irradiated cells in which phalloidin staining was reduced in the irradiated areas phalloidin staining also was reduced poleward from the irradiated areas. These results show that phalloidin staining of chromosomal spindle fibres is not dependent on the presence of kinetochore microtubules, and, therefore, that actin filaments are present in the spindle fibres in vivo. We suggest that actin filaments present in spindle fibres in vivo may be involved in causing chromosome movements during anaphase.
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Czaban, B.B., Forer, A. Rhodamine-phalloidin and anti-tubulin antibody staining of spindle fibres that were irradiated with an ultraviolet microbeam. Protoplasma 178, 18–27 (1994). https://doi.org/10.1007/BF01404117
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DOI: https://doi.org/10.1007/BF01404117