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Evidence of p38γ and p38δ involvement in cell transformation processes

M Isabel Cerezo-Guisado1, Paloma del Reino, Gaëlle Remy

  • 1Department of Immunology and Oncology, Centro Nacional de Biotecnología/CSIC, Campus de Cantoblanco, 28049 Madrid, Spain.

Carcinogenesis
|May 12, 2011
PubMed

Insights

The p38γ and p38δ isoforms of p38 mitogen-activated protein kinase (p38MAPK) pathway are crucial in suppressing tumor development. Their absence promotes cell migration, proliferation, and tumorigenesis, highlighting their role in cancer suppression.

Area of Science:

  • Cellular Biology
  • Molecular Oncology
  • Signal Transduction Pathways

Background:

  • The p38 mitogen-activated protein kinase (p38MAPK) pathway regulates critical cell functions.
  • Deregulation of p38MAPK signaling is implicated in cancer development and progression.
  • The roles of p38γ and p38δ isoforms in cancer are less understood compared to p38α.

Purpose of the Study:

  • To investigate the involvement of p38γ and p38δ isoforms in malignant transformation.
  • To define the specific contributions of p38γ and p38δ to processes driving cancer.
  • To elucidate the tumor-suppressive functions of p38γ and p38δ.

Main Methods:

  • Utilized embryonic fibroblasts from mice genetically deficient in p38γ or p38δ.
  • Assessed cell migration, metalloproteinase-2 secretion, and cell contact inhibition in knockout models.
  • Evaluated cell proliferation and tumorigenesis in K-Ras-transformed fibroblasts lacking p38γ in vitro and in vivo.

Main Results:

  • Absence of either p38γ or p38δ enhanced cell migration and metalloproteinase-2 secretion.
  • p38δ deficiency specifically impaired cell contact inhibition.
  • Loss of p38γ in K-Ras-transformed cells increased proliferation and tumorigenesis (in vitro and in vivo).

Conclusions:

  • p38γ and p38δ isoforms play significant roles in suppressing malignant transformation.
  • These isoforms contribute to the regulation of cell migration, proliferation, and contact inhibition.
  • The findings reveal a tumor-suppressive function for p38γ and p38δ in the p38MAPK pathway.

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