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Over-expression of Rap2a inhibits glioma migration and invasion by down-regulating p-AKT

Lei Wang1, Wenjian Zhan, Shao Xie

  • 1Department of Neurosurgery, Xijing Hospital, The Fourth Military Medical University, 17 West Changle Road, Xi'an, Shaanxi, 710032, China; Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical College, Jiangsu, 221002, China.

Cell Biology International
|December 3, 2013
PubMed

Insights

Rap2a acts as a tumor suppressor in gliomas, inhibiting cell migration and invasion. Its reduced expression promotes glioma progression by increasing AKT phosphorylation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • The Ras-oncogenic pathway is crucial in human tumor development, with mutations in H-Ras, N-Ras, and K-Ras being common.
  • Dysregulated Ras signaling is implicated in tumorigenesis, particularly in central nervous system gliomas.
  • Rap proteins, part of the small GTPase superfamily, are involved in various biological processes, but their role in glioma development is unclear.

Purpose of the Study:

  • To investigate the involvement of Rap proteins in the pathogenesis of multiple gliomas.
  • To determine the specific role of Rap2a in glioma cell migration, invasion, and signaling pathways.

Main Methods:

  • Analysis of Rap2a protein levels and activity (GTP-Rap2a) in glioma tissues.
  • Overexpression and downregulation studies of Rap2a in glioma cells.
  • Assessment of cell migration and invasion.
  • Evaluation of AKT phosphorylation and PI3K pathway activity.

Main Results:

  • Rap2a and GTP-Rap2a levels were low in glioma tissues.
  • Overexpression of Rap2a, particularly the dominant-active form (DA-Rap2a), inhibited glioma cell migration and invasion.
  • Downregulation of Rap2a promoted glioma migration and invasion, increasing AKT phosphorylation, an effect reversed by the PI3K inhibitor LY294002.

Conclusions:

  • Rap2a functions as a tumor suppressor in glioma pathogenesis, contrasting with other Ras family members.
  • Rap2a inhibits glioma cell migration and invasion, likely through the PI3K/AKT signaling pathway.
  • Understanding Rap2a's role offers potential therapeutic insights for glioma treatment.
Keywords:
Rap GTPaseRasgliomainvasionmigration

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