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GAB2 promotes cell proliferation by activating the ERK signaling pathway in hepatocellular carcinoma

Yuyan Chen1, Qingqing Liu2, Miaomiao Wu2

  • 1Class 2, Grade 13, Clinical Medicine, Medical College, Nantong University, Nantong, Jiangsu, 226001, People's Republic of China.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|March 31, 2016
PubMed

Insights

Grb2-associated binding protein 2 (GAB2) promotes hepatocellular carcinoma (HCC) cell proliferation by enhancing ERK signaling. Increased GAB2 expression correlates with poor prognosis and doxorubicin resistance in HCC patients, suggesting GAB2 as a therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Grb2-associated binding protein 2 (GAB2) is a scaffolding adaptor protein involved in PI3K and ERK signaling pathways, crucial for cell proliferation and tumor progression.
  • The role of GAB2 in hepatocellular carcinoma (HCC) remains largely unexplored, necessitating investigation into its expression and functional significance in this malignancy.

Purpose of the Study:

  • To investigate the expression levels of GAB2 in HCC tissues.
  • To determine the clinical and biological significance of GAB2 in HCC.
  • To elucidate the role of GAB2 in HCC cell proliferation, signaling pathways, and drug resistance.

Main Methods:

  • Western blot and immunohistochemistry were used to analyze GAB2 expression in HCC tissues.
  • Kaplan-Meier survival analysis was performed to assess the prognostic value of GAB2.
  • In vitro assays including RNA interference, CCK-8, EDU, colony formation, and flow cytometry were employed to study GAB2's effect on cell proliferation.
  • ERK signaling pathway activation was assessed in relation to GAB2 expression.

Main Results:

  • GAB2 was significantly upregulated in HCC tissues and correlated with higher histological grade, larger tumor size, and increased Ki-67 expression.
  • Elevated GAB2 expression was associated with poor overall survival in HCC patients, identifying it as an independent prognostic marker.
  • GAB2 accumulation during the S phase of the cell cycle promoted HCC cell proliferation, partly through the enhancement of ERK signaling.
  • GAB2 conferred doxorubicin resistance to HCC cells.

Conclusions:

  • GAB2 plays a critical role in promoting HCC cell proliferation and progression, likely by activating the ERK signaling pathway.
  • GAB2 is a potential prognostic biomarker and therapeutic target for hepatocellular carcinoma.
  • Targeting GAB2 may offer a novel therapeutic strategy for improving HCC treatment outcomes and overcoming drug resistance.
Keywords:
Cell proliferationDoxorubicin resistanceERK signalingGAB2Hepatocellular carcinomaPrognosis

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