Related Experiment Video

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X-Linked Inhibitor of Apoptosis Protein (XIAP) Contributes to ERK1/2-Mediated Anoikis Resistance in Hepatocellular

Qingyu Zeng1,2, Zun Mao1,3, Sumin Sun1

  • 1Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing, China.

Medcomm - Oncology
|May 6, 2026
PubMed

Insights

X-linked inhibitor of apoptosis protein (XIAP) enhances hepatocellular carcinoma (HCC) cell survival during anoikis by increasing XIAP expression and phosphorylation. Extracellular signal-regulated kinases 1/2 (ERK1/2) signaling drives this process, offering potential therapeutic targets for HCC metastasis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Anoikis resistance is crucial for hepatocellular carcinoma (HCC) metastasis.
  • The role of X-linked inhibitor of apoptosis protein (XIAP) in HCC anoikis resistance is not well understood.

Purpose of the Study:

  • To investigate the mechanism of XIAP in conferring anoikis resistance in HCC cells.
  • To explore the correlation between XIAP, extracellular signal-regulated kinases 1/2 (ERK1/2), and HCC metastasis.

Main Methods:

  • Analysis of XIAP and ERK1/2 expression in HCC microvascular tumor thrombosis (MVTT).
  • Assessment of XIAP expression and phosphorylation in detached HCC cells.
  • Investigation of XIAP domain function in anoikis resistance.
  • Evaluation of ERK1/2's role in controlling XIAP expression in cell-based and mouse models.

Main Results:

  • Increased XIAP expression in HCC MVTT, correlated with ERK1/2 expression.
  • Detached HCC cells showed increased XIAP expression and enhanced phosphorylation, leading to anoikis resistance.
  • XIAP's baculovirus IAP repeat (BIR) domains, not the RING domain, mediated anoikis resistance.
  • ERK1/2 signaling was found to control XIAP expression, promoting anoikis resistance in HCC.

Conclusions:

  • XIAP, regulated by ERK1/2, plays a significant role in promoting anoikis resistance in HCC cells.
  • The BIR domains of XIAP are critical for conferring anoikis resistance.
  • Targeting the XIAP-ERK1/2 interaction presents a potential therapeutic strategy for HCC treatment and metastasis prevention.
Keywords:
X-linked inhibitor of apoptosis proteinanoikisextracellular signal-regulated kinases 1/2hepatocellular carcinomaresistance

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