Physiological levels of TNFalpha stimulation induce stochastic dynamics of NF-kappaB responses in single living cells

David A Turner, Pawel Paszek, Dan J Woodcock, David E Nelson, Caroline A Horton, Yunjiao Wang, David G Spiller, David A Rand, Michael R H White, Claire V Harper

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)

Abstract

Nuclear factor kappa B (NF-kappaB) signalling is activated by cellular stress and inflammation and regulates cytokine expression. We applied single-cell imaging to investigate dynamic responses to different doses of tumour necrosis factor alpha (TNFalpha). Lower doses activated fewer cells and those responding showed an increasingly variable delay in the initial NF-kappaB nuclear translocation and associated IkappaBalpha degradation. Robust 100 minute nuclear:cytoplasmic NF-kappaB oscillations were observed over a wide range of TNFalpha concentrations. The result is supported by computational analyses, which identified a limit cycle in the system with a stable 100 minute period over a range of stimuli, and indicated no co-operativity in the pathway activation. These results suggest that a stochastic threshold controls functional all-or-nothing responses in individual cells. Deterministic and stochastic models simulated the experimentally observed activation threshold and gave rise to new predictions about the structure of the system and open the way for better mechanistic understanding of physiological TNFalpha activation of inflammatory responses in cells and tissues.

Original languageEnglish
Pages (from-to)2834-43
Number of pages10
JournalJournal of Cell Science
Volume123
Issue numberPt 16
DOIs
Publication statusPublished - 15 Aug 2010

Keywords

  • Cell Line, Tumor
  • Dose-Response Relationship, Drug
  • Gene Expression
  • Humans
  • I-kappa B Proteins/metabolism
  • Microscopy, Confocal
  • Models, Biological
  • NF-KappaB Inhibitor alpha
  • NF-kappa B/biosynthesis
  • Signal Transduction
  • Stochastic Processes
  • Transcription Factor RelA/metabolism
  • Transcription, Genetic
  • Transcriptional Activation
  • Transfection
  • Tumor Necrosis Factor-alpha/genetics

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