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Concurrent protective and destructive signaling of JNK2 in neuroblastoma cells

Vicki Waetzig1, Ute Wacker, Wiebke Haeusgen

  • 1Institute of Pharmacology, University Hospital Schleswig-Holstein, Campus Kiel, Hospitalstrasse 4, Kiel, Germany.

Cellular Signalling
|April 23, 2009
PubMed

Insights

The study reveals that c-Jun N-terminal kinases (JNKs) can simultaneously promote cell survival and trigger apoptosis. Specifically, JNK2 isoforms regulate both cell cycle progression and cell death in neuroblastoma cells, impacting cancer therapy strategies.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Signal Transduction

Background:

  • c-Jun N-terminal kinases (JNKs) are known for their role in stress response and apoptosis, crucial for chemotherapy.
  • JNK signaling also contributes to physiological processes in cancer, including cell cycle regulation and oncogenesis.
  • The specific functions of JNKs are hypothesized to depend on their signalosome composition, leading to diverse outcomes.

Purpose of the Study:

  • To differentiate between the pro-apoptotic and physiological roles of JNKs in cancer.
  • To investigate how JNK signalosome composition influences signaling outcomes.
  • To elucidate the distinct functions of JNK isoforms in response to cytoskeleton-disrupting agents.

Main Methods:

  • Utilized the human neuroblastoma cell line SH-SY5Y as a model system.
  • Employed cytoskeleton-interfering substances: colchicine, cytochalasin D, and taxol.
  • Applied JNK inhibition using SP600125, compartment-specific inhibitors, and dominant-negative mutants.

Main Results:

  • JNKs were found to mediate both cell death and proliferation.
  • Nuclear JNK2 was identified as the primary mediator of apoptosis induced by colchicine and taxol.
  • Both cytoplasmic and nuclear JNK2 contributed to cell cycle promotion.
  • Apoptosis induced by cytochalasin D was independent of JNK signaling.
  • Demonstrated simultaneous control of cell-protective and cell-destructive mechanisms by a single JNK isoform.

Conclusions:

  • JNK signaling exhibits dual roles, mediating both cell survival and apoptosis within the same cellular context.
  • The localization and isoform of JNK (specifically JNK2) are critical determinants of its function.
  • Findings have significant implications for the therapeutic use of JNK inhibitors and cytoskeleton-targeting drugs in oncology.

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