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RASSF4 Suppresses Gastric Tumor Growth through Activation of Chk2-p53 Signaling Axis

Soon-Ki Park1, Min-Ju Kang1, Kyung-Phil Ko1

  • 1Department of Life Sciences, Korea University, Seoul, Korea.

Cancer Research and Treatment
|April 22, 2025
PubMed
Abstract

Insights

Ras association domain family 4 (RASSF4) is epigenetically silenced in gastric cancers, suppressing tumor growth by activating the Chk2-p53 pathway. Restoring RASSF4 expression improves patient survival and therapeutic response.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Ras association domain family 4 (RASSF4) is a potential tumor suppressor frequently inactivated in various human cancers.
  • The role of RASSF4 in gastric cancer development and progression is not well understood.

Purpose of the Study:

  • To investigate the expression status of RASSF4 in gastric cancer cell lines and tissues.
  • To elucidate the regulatory role of RASSF4 in gastric tumor growth, proliferation, and apoptosis.
  • To determine the mechanistic link between RASSF4, p53, and Chk2 in gastric tumorigenesis.

Main Methods:

  • Quantitative PCR and immunoblotting to assess RASSF4 expression in cancer cell lines and tissues.
  • Flow cytometry, colony formation, and thymidine incorporation assays to evaluate RASSF4's impact on cell proliferation and apoptosis.
  • Cycloheximide chase, reporter assays, and immunoprecipitation to analyze RASSF4's regulation of p53.
  • Mouse xenograft models to assess RASSF4's effect on tumor growth and response to chemotherapy.

Main Results:

  • RASSF4 is epigenetically inactivated in a significant proportion of gastric cancer cell lines (61.5%) and primary carcinomas (75%).
  • RASSF4 suppresses cell proliferation via G2/M cell-cycle arrest and enhances apoptosis, particularly in response to genotoxic agents, in a p53-dependent manner.
  • RASSF4 stabilizes p53 through Chk2 activation, and its apoptotic function is dependent on both p53 and Chk2.
  • RASSF4 expression correlates with improved overall survival in gastric cancer patients and attenuates tumor growth in vivo, enhancing sensitivity to 5-fluorouracil.

Conclusions:

  • RASSF4 acts as a tumor suppressor in gastric cancer by activating the Chk2-p53 signaling axis.
  • Epigenetic inactivation of RASSF4 contributes to gastric tumorigenesis and impacts patient prognosis.
  • RASSF4 represents a potential therapeutic target for enhancing gastric cancer treatment efficacy.
Keywords:
ApoptosisChk2Promoter methylationRASSF4Stomach neoplasmsTumor suppressorp53

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