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Rac1b enhances cell survival through activation of the JNK2/c-JUN/Cyclin-D1 and AKT2/MCL1 pathways

Gang Li1,2, Li Ying3, Hong Wang1

  • 1Department of Cardiology, Affiliated Xinhua Hospital, Shanghai Jiaotong University (SJTU) School of Medicine, Shanghai, China.

Oncotarget
|February 27, 2016
PubMed

Insights

Rac1b, a Rac1 variant, promotes cell proliferation and inhibits apoptosis by activating specific pathways. This study reveals Rac1b’s dual role in cancer, highlighting the AKT2/MCL1 pathway

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Rac1b is an alternatively spliced, constitutively active form of Rac1.
  • Previous research indicates Rac1b promotes cell proliferation and inhibits apoptosis.

Purpose of the Study:

  • To investigate the molecular mechanisms by which Rac1b influences gene expression, cell proliferation, and apoptosis.
  • To identify key signaling pathways regulated by Rac1b in human cancer cells and rat colonic epithelium.

Main Methods:

  • Microarray analysis to detect differentially expressed genes in HEK293T and SW480 cells overexpressing Rac1b.
  • Gene knockout and knockdown techniques in rat and human colon cancer cell lines (HT29).
  • Western blotting and pathway analysis to confirm gene and protein expression changes.

Main Results:

  • Rac1b overexpression upregulated pro-proliferation genes (JNK2, c-JUN, cyclin-D1) and anti-apoptotic genes (AKT2, MCL1) in HEK293T and SW480 cells.
  • Rac1b activated JNK2/c-JUN/cyclin-D1 and AKT2/MCL1 pathways, promoting proliferation and inhibiting apoptosis.
  • Low endogenous Rac1b levels in rat colonic epithelium primarily inhibited apoptosis via the AKT2/MCL1 pathway.
  • Rac1b gene modification or knockdown predominantly affected the AKT2/MCL1 pathway.

Conclusions:

  • Rac1b exhibits a dual role: low levels inhibit apoptosis, while upregulation promotes proliferation and inhibits apoptosis.
  • The AKT2/MCL1 pathway appears to be more sensitive to Rac1b regulation than the JNK2/c-JUN/cyclin-D1 pathway.
  • Rac1b is a significant regulator of cell proliferation and apoptosis, with implications for colon cancer development and progression.
Keywords:
AKT2JNK2Rac1bapoptosiscell proliferation

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