White RA, Asmuth DM, Lu Y, Wang N, Li XD, Reece L, Pollard RB, Nokta M, Leary JF, Terry NHA. Estimating cell death in G2M using bivariate BrdUrd/DNA flow cytometry.
Cytometry A 2005;
66:32-40. [PMID:
15915505 DOI:
10.1002/cyto.a.20147]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
BACKGROUND
In an accompanying paper (Asmuth et al.) it was found necessary to include cell death explicitly to estimate parameters of cell proliferation. The use of bivariate flow cytometry to estimate the phase durations and the doubling times of cells labeled with thymidine analogues is well established. However, these methods of analysis do not consider the possibility of cell death. This report demonstrates that estimating cell death in G(2)/M is possible.
METHODS
Mathematical models for the experimental quantities, the fraction of labeled undivided cells, the fraction of labeled divided cells, and the relative movement were developed. These models include the possibility that, of the cells with G(2)/M DNA content, only a certain fraction will divide, with the remainder dying after some time T(R). Simulation studies were conducted to test the possibility of using simple methods to estimate phase durations and cell death rates.
RESULTS
Cell death alters the estimates of phase transit times in a rather complex manner that depends on the lifetime of the doomed cells. However, it is still possible to obtain estimates of the phase durations of cells in S and G(2)/M and the death rates of cells in G(2)/M.
CONCLUSIONS
The methods presented herein provide a new way to characterize cell populations that includes cell death rates and common measurements of cell proliferation.
Collapse