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Related Experiment Videos

Multistable and multistep dynamics in neutrophil differentiation.

Hannah H Chang1, Philmo Y Oh, Donald E Ingber

  • 1Vascular Biology Program, Department of Pathology and Surgery, Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA. hchang@fas.harvard.edu

BMC Cell Biology
|March 2, 2006
PubMed
Summary

Mammalian cell differentiation, studied in HL60 cells, does not follow a simple bistable switch model. Instead, it involves a primed state, suggesting a complex, multi-step process in gene regulatory networks.

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Area of Science:

  • Cell biology
  • Systems biology
  • Molecular genetics

Background:

  • Cell differentiation is often modeled as a bistable switch.
  • Bistable dynamics have been observed in microbial gene regulatory circuits.
  • Mammalian cell differentiation dynamics lack bistability analysis.

Purpose of the Study:

  • To analyze the dynamics of mammalian cell differentiation in HL60 cells.
  • To investigate the role of bistability in HL60 cell differentiation into neutrophils.
  • To characterize the transition from promyelocytic precursor to neutrophil lineage.

Main Methods:

  • Single-cell analysis of CD11b (Mac-1) expression kinetics.
  • Stimulation of HL60 cells with dimethyl sulfoxide (DMSO).
  • Isolation and culture of "unswitched" CD11bLow subpopulations.

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Main Results:

  • CD11b expression showed all-or-none switch-like behavior at the single-cell level.
  • A bimodal distribution of CD11bLow and CD11bHigh subpopulations was observed.
  • Priming to differentiate was detected in isolated CD11bLow cells.

Conclusions:

  • HL60 cell differentiation into neutrophils is not a simple bistable switch transition.
  • Mammalian differentiation appears to be a multi-step process in a high-dimensional system.
  • This complexity aligns with highly connected gene regulatory networks.