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Antagonistic control of cell fates by JNK and p38-MAPK signaling

T Wada1, E Stepniak, L Hui

  • 1IMBA: Institute of Molecular Biotechnology of the Austrian Academy of Sciences, Dr. Bohrgasse 3, Vienna, Austria.

Cell Death and Differentiation
|September 1, 2007
PubMed

Insights

The balance between JNK and p38-MAPK stress kinase pathways antagonistically controls cell fate, including senescence and proliferation. This balance is crucial for tissue regeneration and preventing oncogenic transformation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Cell fate decisions (proliferation, differentiation, aging) are critical during development and organogenesis.
  • Two key stress kinase pathways, JNKs and p38-MAPK, mediate responses to developmental and environmental cues.
  • The intricate functional interactions and molecular cross-talk between JNK and p38-MAPK pathways remain poorly understood.

Purpose of the Study:

  • To elucidate the functional interactions between JNK and p38-MAPK signaling pathways.
  • To determine the role of these pathways in controlling cell fate decisions such as senescence, proliferation, and oncogenic transformation.
  • To investigate the involvement of these pathways in adult tissue regeneration.

Main Methods:

  • Utilized primary mouse embryonic fibroblasts (MEFs) to study cell fate.
  • Employed genetic inactivation of the JNK pathway in fetal hepatoblasts.
  • Assessed the effects of inhibiting the p38-MAPK pathway on JNK-deficient cells and liver regeneration.

Main Results:

  • Demonstrated that JNK and p38-MAPK pathways antagonistically regulate cellular senescence, oncogenic transformation, and proliferation in MEFs.
  • Showed that genetic inactivation of JNK impairs fetal hepatoblast proliferation and adult liver regeneration.
  • Confirmed that inhibiting p38-MAPK rescues the proliferation defects caused by JNK inactivation in liver regeneration models.

Conclusions:

  • The balance between MKK7-JNK and MKK3/6-p38-MAPK pathways is a key determinant of cell fate.
  • These stress-signaling pathways link environmental and developmental stress to critical cellular processes like cell cycle arrest, senescence, and oncogenic transformation.
  • The interplay between JNK and p38-MAPK is essential for adult tissue regeneration.

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