Delayed cyclin A and B1 degradation in non-transformed mammalian cells - PubMed (original) (raw)
. 1995 Jul:108 ( Pt 7):2599-608.
doi: 10.1242/jcs.108.7.2599.
Affiliations
- PMID: 7593301
- DOI: 10.1242/jcs.108.7.2599
Delayed cyclin A and B1 degradation in non-transformed mammalian cells
F Girard et al. J Cell Sci. 1995 Jul.
Abstract
Cyclins A and B are known to exhibit significant differences in their function, cellular distribution and timing of degradation at mitosis. On the basis of observations in marine invertebrates and Xenopus, it was proposed that cyclin destruction triggers cdc2 kinase inactivation and anaphase onset. However, this model has recently been questioned, both in Xenopus and in budding yeast. In this report, we present evidence for delayed degradation of both cyclins A and B1 in non-transformed mammalian cells. Indeed, by means of indirect immunofluorescence and confocal microscopy, we show that cyclins A and B1 are present up to anaphase in REF52, Hs68, human primary fibroblasts and NRK epithelial cells. In marked contrast, cyclin A is shown to be degraded within metaphase and cyclin B just at the transition to anaphase in HeLa and two transformed cell lines, derivatives of normal NRK and REF52. These results further support the notion that cyclin destruction might be not correlated with anaphase onset in normal cells and highlight a significant difference in the fate of mitotic cyclins between transformed and non-transformed cells.
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