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P38 alpha mitogen-activated protein kinase sensitizes cells to apoptosis induced by different stimuli

Almudena Porras1, Susana Zuluaga, Emma Black

  • 1Departamento de Bioquimica y Biologia Molecular II, Centro Mixto UCM/CSIC, UCM, Ciudad Universitaria, 28040 Madrid, Spain. maporras@farm.ucm.es

Molecular Biology of the Cell
|November 18, 2003
PubMed

Insights

p38 alpha mitogen-activated protein (MAP) kinase deficiency increases resistance to apoptosis in cardiomyocytes and fibroblasts. This occurs via reduced proapoptotic proteins and enhanced survival pathways, highlighting p38 alpha

Area of Science:

  • Cellular and Molecular Biology
  • Signal Transduction
  • Apoptosis Research

Background:

  • p38 alpha mitogen-activated protein (MAP) kinase is a key regulator of cellular responses to stress, proliferation, and survival.
  • Understanding the role of p38 alpha in apoptosis is crucial for various physiological and pathological processes.

Purpose of the Study:

  • To investigate the specific role of p38 alpha MAP kinase in regulating apoptosis.
  • To elucidate the molecular mechanisms by which p38 alpha influences cell death pathways.

Main Methods:

  • Utilized cell lines derived from p38 alpha knockout mice.
  • Assessed apoptosis levels in response to various stimuli.
  • Quantified the expression of proapoptotic (Bax) and antiapoptotic proteins.
  • Measured extracellular signal-regulated kinase (ERK) MAP kinase activity.
  • Investigated STAT3 phosphorylation status.

Main Results:

  • Cardiomyocytes and fibroblasts lacking p38 alpha exhibited increased resistance to apoptosis.
  • Reduced apoptosis correlated with decreased expression of Bax and Fas/CD-95.
  • p38 alpha-deficient cells showed elevated ERK MAP kinase activity.
  • ERK-mediated STAT3 phosphorylation may contribute to reduced Bax and Fas expression.

Conclusions:

  • p38 alpha signaling sensitizes cells to apoptosis.
  • This sensitization occurs through the upregulation of proapoptotic proteins (Bax, Fas) and downregulation of survival pathways (ERK/STAT3).
  • Targeting p38 alpha may offer therapeutic strategies for modulating apoptosis.

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