The roles of kinetochore of micronucleus in mitosis of HeLa cells: a live cell imaging study

Cancer Cell International
Erkang JiangZhongwen Xie

Abstract

Micronuclei (MNi) are extensively used to evaluate genotoxic effects and chromosome instability. However, the roles of kinetochore of MN in mitosis have not been completely addressed. The HeLa CENP B-GFP H2B-mCherry cells are applied to address these questions via the long-term live-cell imaging. In the cells, the kinetochore-positive micronucleus (K+MN) contained CENP B-GFP, while the kinetochore-negative micronucleus (K-MN) did not. K-MN-bearing cells produced much more chromosome fragments than did MN-free cells. Most of the chromosome fragments eventually merged into K-MNi. K+MN-bearing cells yielded more kinetochore-positive lagging chromosomes (K+LCs) and K+MNi than MN-free cells did. The results suggested the differences in the fates of K+MNi and K-MNi in mitosis. The cycle of K-MN → Chromosome fragment → K-MN may occur in generations of K-MN-bearing cells, while part of K+MNi might reincorporate into the main nucleus. The K+MN-bearing cells prolonged significantly duration of mitosis compared with MN-free cells. The presence of micronuclei, regardless of K-MN and K+MN, enhanced apoptosis cell death. And K+MN-bearing cells were inclined to apoptosis more than K-MN-bearing cells. The results suggested differences in fates...Continue Reading

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Citations

Sep 20, 2020·International Journal of Cancer. Journal International Du Cancer·Xihan GuoXu Wang
Jul 19, 2020·Archives of Toxicology·Hauke ReimannHenning Hintzsche

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