Visualization of JNK activity dynamics with a genetically encoded fluorescent biosensor

Matthew Fosbrink, Nwe Nwe Aye-Han, Raymond Cheong, Andre Levchenko, Jin Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

The signaling pathway mediated by JNK transduces different types of signals, such as stress stimuli and cytokines, into functional responses that mediate apoptosis, as well as proliferation, differentiation, and inflammation. To better characterize the dynamic information flow and signal processing of this pathway in the cellular context, a genetically encoded, fluorescent protein-based biosensor was engineered to detect endogenous JNK activity. This biosensor, named JNKAR1 (for JNK activity reporter), specifically detects stress- (ribotoxic and osmotic) and cytokine- (TNF-α) induced JNK activity in living cells with a 15 to 30% increase in the yellow-to-cyan emission ratio because of a phosphorylation-dependent increase in FRET between two fluorescent proteins. JNK activity was detected not only in the cytoplasm, but also in the nucleus, mitochondria, and plasma membrane with similar kinetics after induction of ribotoxic stress by anisomycin, suggesting relatively rapid signal propagation to the nuclear, mitochondrial, and plasma membrane compartments. Furthermore, quantitative single-cell analysis revealed that anisomycin-induced JNK activity exhibited ultrasensitivity, sustainability, and bimodality, features that are consistent with behaviors of bistable systems. The development of JNKAR1, therefore, laid a foundation for evaluating the signaling properties and behaviors of the JNK cascade in single living cells.

Original languageEnglish (US)
Pages (from-to)5459-5464
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume107
Issue number12
DOIs
StatePublished - Mar 23 2010

Keywords

  • Bistable
  • FRET
  • Kinase
  • MAPK
  • Subcellular

ASJC Scopus subject areas

  • General

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