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RHBDL2 is a critical membrane protease for anoikis resistance in human malignant epithelial cells

Tsung-Lin Cheng1, Chao-Han Lai2, Shinn-Jong Jiang3

  • 1Department of Physiology, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan.

Thescientificworldjournal
|July 1, 2014
PubMed

Insights

Rhomboid-like-2 (RHBDL2) promotes cancer cell survival by enabling anoikis resistance. This protease activates epithelial growth factor receptor (EGFR) signaling, offering a new therapeutic target for inhibiting cancer metastasis.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Cancer Metastasis Research

Background:

  • Anoikis resistance is crucial for metastatic tumor cell survival in non-adherent environments.
  • Epithelial growth factor receptor (EGFR) signaling activation is a key mechanism for anoikis resistance, but its regulation in metastatic cells is unclear.

Purpose of the Study:

  • To investigate the role of Rhomboid-like-2 (RHBDL2) in anoikis resistance and EGFR activation in metastatic epithelial cells.
  • To identify RHBDL2 as a potential therapeutic target for cancer metastasis.

Main Methods:

  • Overexpression of RHBDL2 in human epithelial cells.
  • Long-term suspension cultures of aggressive tumor cell lines.
  • Treatment with a rhomboid protease inhibitor and RHBDL2 shRNA.
  • Inhibition of EGFR activation and assessment of downstream signaling (e.g., focal adhesion kinase phosphorylation).

Main Results:

  • RHBDL2 overexpression promoted cell proliferation, reduced cell adhesion, and suppressed anoikis.
  • Increased RHBDL2 levels were observed in aggressive tumor cell lines under suspension culture.
  • RHBDL2 inhibition or EGFR inhibition increased apoptosis markers (cleaved caspase 3) and reduced focal adhesion kinase phosphorylation.

Conclusions:

  • RHBDL2 is a critical molecule mediating anoikis resistance in malignant epithelial cells, likely via EGFR-mediated signaling.
  • RHBDL2 represents a novel therapeutic target for combating cancer metastasis.

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