Park SH, Xie S, Rao CV, Dai W. Haplo-insufficiency of both BubR1 and SGO1 accelerates cellular senescence.
J Hematol Oncol 2016;
9:7. [PMID:
26847209 PMCID:
PMC4743409 DOI:
10.1186/s13045-016-0238-5]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 01/28/2016] [Indexed: 12/02/2022] Open
Abstract
Background
Spindle assembly checkpoint components BubR1 and Sgo1 play a key role in the maintenance of chromosomal instability during cell division. These proteins function to block the anaphase entry until all condensed chromosomes have been attached by the microtubules emanating from both spindle poles. Haplo-insufficiency of either BubR1 or SGO1 results in enhanced chromosomal instability and tumor development in the intestine. Recent studies show that spindle checkpoint proteins also have a role in slowing down the ageing process. Therefore, we want to study whether haplo-insufficiency of both BubR1 and SGO1 accelerates cellular senescence in mice.
Methods
We took advantage of the availability of BubR1 and SGO1 knockout mice and generated primary murine embryonic fibroblasts (MEFs) with mutations in either BubR1, SGO1, or both and analyzed cellular senescence of the MEFs of various genetic backgrounds.
Results
We observed that BubR1+/−SGO+/− MEFs had an accelerated cellular senescence characterized by morphological changes and expressed senescence-associated β-galactosidase. In addition, compared with wild-type MEFs or MEFs with a single gene deficiency, BubR1+/−SGO1+/− MEFs expressed enhanced levels of p21 but not p16.
Conclusions
Taken together, our observations suggest that combined deficiency of BubR1 and Sgo1 accelerates cellular senescence.
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