RT Journal Article
SR Electronic
T1 The intensities of canonical senescence biomarkers integrate the duration of cell-cycle withdrawal
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2023.03.18.533242
DO 10.1101/2023.03.18.533242
A1 Ashraf, Humza M.
A1 Fernandez, Brianna
A1 Spencer, Sabrina L.
YR 2023
UL http://biorxiv.org/content/early/2023/03/21/2023.03.18.533242.abstract
AB Senescence, a state of permanent cell-cycle withdrawal, is difficult to distinguish from quiescence, a transient state of cell-cycle withdrawal. This difficulty arises because quiescent and senescent cells are defined by overlapping biomarkers, raising the question of whether quiescence and senescence are truly distinct states. To address this, we used single-cell time-lapse imaging to distinguish slow-cycling quiescent cells from bona fide senescent cells after chemotherapy treatment, followed immediately by staining for various senescence biomarkers. We found that the staining intensity of multiple senescence biomarkers is graded rather than binary and primarily reflects the duration of cell-cycle withdrawal, rather than senescence per se. Together, our data suggest that quiescence and senescence are not distinct cellular states but rather fall on a continuum of cell-cycle withdrawal, where the intensities of canonical senescence biomarkers reflect the likelihood of cell-cycle re-entry.Competing Interest StatementThe authors have declared no competing interest.