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Vav1 accelerates Ras-driven lung cancer and modulates its tumor microenvironment.

Batel Shalom1, Marganit Farago1, Yaser Salaymeh1

  • 1Departement of Developmental Biology and Cancer Research, Institute for Medical Research Israel-Canada, Hadassah Medical School - Hebrew University, Jerusalem, Israel.

Cellular Signalling
|June 25, 2022
PubMed
Summary
This summary is machine-generated.

The study found that Vav1 and K-Ras cooperate to accelerate lung cancer development in mice. This oncogene synergy enhances tumor growth and immune cell infiltration, highlighting Vav1

Keywords:
ERKK-RasLung CancerVav1

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Area of Science:

  • Oncology
  • Molecular Biology
  • Immunology

Background:

  • Vav1, a GDP/GTP nucleotide exchange factor (GEF), is implicated in human cancers, including lung cancer, due to mutations or overexpression.
  • Vav1 is typically restricted to the hematopoietic system and its activity is regulated by tyrosine phosphorylation.

Purpose of the Study:

  • To investigate the in-vivo role of Vav1 in lung cancer development.
  • To determine if Vav1 cooperates with oncogenes like mutant K-Ras in lung tumorigenesis.

Main Methods:

  • Generation of novel transgenic mouse strains expressing Vav1, K-RasG12D, or both in type II pneumocytes.
  • Analysis of lung tumor development, immune cell infiltration, ERK phosphorylation, and cytokine levels.

Main Results:

  • Coexpression of Vav1 and K-RasG12D significantly accelerated malignant lung cancer progression compared to K-RasG12D alone.
  • Vav1 expression alone did not induce lung tumorigenesis.
  • Increased B-cell, T-cell, and monocyte infiltration, elevated ERK phosphorylation, and increased IL-4/IL-13 levels were observed in K-RasG12D/Vav1 mice.

Conclusions:

  • Vav1 and K-Ras synergize to promote lung tumor development.
  • Vav1 contributes to lung cancer progression through its signaling pathways.
  • The tumor microenvironment and immune responses are modulated by the coexpression of these oncogenes.