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RCC2 Interacts with Small GTPase RalA and Regulates Cell Proliferation and Motility in Gastric Cancer

Pengpeng Wang1,2, Wang Zhang2, Lili Wang2

  • 1School of Medicine, Nankai University, Tianjin 300071, People's Republic of China.

Oncotargets and Therapy
|April 29, 2020
PubMed
Abstract

Insights

Regulator of chromosome condensation 2 (RCC2) is overexpressed in gastric cancer, promoting cell growth and tumor progression. Inhibiting RCC2 significantly reduces cancer cell proliferation, migration, and invasion, offering a potential therapeutic target.

Area of Science:

  • Cell Biology
  • Oncology
  • Molecular Mechanisms

Background:

  • Regulator of chromosome condensation 2 (RCC2), also known as TD-60, is implicated in human cancers.
  • Its specific role and mechanism in gastric cancer pathogenesis are not well understood.
  • RCC2 possesses guanine exchange factor (GEF) activity and influences early mitosis.

Purpose of the Study:

  • To investigate the expression and functional significance of RCC2 in gastric cancer.
  • To elucidate the molecular pathways regulated by RCC2 in gastric cancer cells.
  • To assess the therapeutic potential of targeting RCC2 in gastric cancer models.

Main Methods:

  • Quantitative PCR (qPCR), Western blotting, and immunohistochemistry were used to assess RCC2 expression in clinical gastric cancer specimens.
  • Gastric cancer cell lines were utilized to evaluate RCC2's effects on cell biology, including proliferation, migration, and invasion.
  • A mouse model was employed to study tumor progression in vivo.
  • Molecular pathway analysis involved assessing interactions with RalA and the MAPK/JNK pathway, alongside the use of a Ral GTPase inhibitor (RBC8).

Main Results:

  • RCC2 was found to be frequently overexpressed in gastric cancer tissues.
  • Knockdown of RCC2 significantly suppressed gastric cancer cell proliferation, migration, and invasion in vitro.
  • RCC2 knockdown also inhibited tumor growth and progression in a mouse model.
  • RCC2 interacts with RalA, decreasing RalA-GTP levels and increasing MAPK/JNK phosphorylation, effects mimicked by the Ral GTPase inhibitor RBC8.

Conclusions:

  • RCC2 plays a critical role in the development and progression of gastric cancer.
  • Downregulation of RCC2 effectively inhibits cancer cell growth, motility, and tumor progression.
  • RCC2 may exert its effects by modulating the RalA and MAPK/JNK signaling pathways.
Keywords:
RCC2RalAgastric cancermigration and invasionproliferation

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