Cell loss and the concept of potential doubling time

A. Bertuzzi, A. Gandolfi, C. Sinisgalli, G. Starace, P. Ubezio

Research output: Contribution to journalArticle

Abstract

The in vivo infusion of Bromodeoxyuridine (BrdUrd), followed by delayed biopsy and bivariate DNA-BrdUrd flow cytometry, allows the potential doubling time (T(pot)) of human tumors to be estimated. According to Steel, the mathematical definition of T(pot) is T(pot) = 1n 2/K(p), where K(p) is the rate constant of cell production. All the operative formulas which allow the estimation of T(pot) from flow cytometric data derive from this definition. Most authors, however, identify the potential doubling time as the doubling time that the same cell population would exhibit if cell loss were removed. We denote here as T(d)/(noloss) this quantity. Although these two definitions are equivalent in the case of uniform random cell loss, we show, in the framework of Steel's theory of growIng cell populations, that T(pot) and T(d)/(noloss) become distinct kinetic quantities when cell loss is not uniform, i.e., when loss differently affects the quiescent and the proliferative compartment. We discuss the validity of the two formulas currently used for the calculation of T(pot), one based on LI and the other on the v-function, in conditions of non-uniform cell loss. Moreover, we propose two formulas for the estimation of the cycle time T(c), which require, in addition to T(s) and LI, that a measure of the growth fraction be available.

Original languageEnglish
Pages (from-to)34-40
Number of pages7
JournalCytometry
Volume29
Issue number1
DOIs
Publication statusPublished - Sep 1 1997

Keywords

  • Cell cycle duration
  • Cell loss
  • Cell population models
  • DNA-BrdUrd flow cytometry
  • Potential doubling time
  • Tumor growth

ASJC Scopus subject areas

  • Biophysics
  • Cell Biology
  • Endocrinology
  • Hematology
  • Pathology and Forensic Medicine

Fingerprint Dive into the research topics of 'Cell loss and the concept of potential doubling time'. Together they form a unique fingerprint.

  • Cite this