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Genome-wide RNAi screening identifies TMIGD3 isoform1 as a suppressor of NF-κB and osteosarcoma progression

Swathi V Iyer1, Atul Ranjan1, Harold K Elias2

  • 1Department of Cancer Biology, University of Kansas Medical Center, 3901 Rainbow Boulevard, Wahl East 2005, Kansas City, Kansas 66160, USA.

Nature Communications
|November 26, 2016
PubMed

Insights

TMIGD3 isoform1 suppresses osteosarcoma (OS) aggressiveness by inhibiting NF-κB. Lower TMIGD3 and A3AR expression in OS tissues correlates with increased tumor progression and metastasis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Cancer cell survival and growth in anchorage- and serum-independent conditions correlate with aggressiveness.
  • Osteosarcoma (OS) is a challenging bone cancer with significant metastatic potential.

Purpose of the Study:

  • To identify factors suppressing anchorage- and serum-independent growth in osteosarcoma cells.
  • To elucidate the role of TMIGD3 isoform1 in osteosarcoma progression and NF-κB signaling.

Main Methods:

  • Utilized a human whole-genome shRNA library to screen for suppressors of malignant phenotypes.
  • Investigated the effects of TMIGD3 isoform1 and isoform3 on osteosarcoma cell proliferation, tumor formation, and metastasis.
  • Analyzed the involvement of the PKA-Akt-NF-κB signaling axis.

Main Results:

  • TMIGD3 isoform1 (i1) was identified as a suppressor of aggressive phenotypes in osteosarcoma cells.
  • Knockdown of TMIGD3 increased proliferation, tumor formation, and metastasis, while overexpression suppressed these properties.
  • TMIGD3 i1 and Adenosine A3 receptor (A3AR) share similar inhibitory effects on the PKA-Akt-NF-κB axis, with lower expression in OS tissues.
  • TMIGD3 i1 partially rescued A3AR knockdown phenotypes, indicating distinct yet overlapping pathways.

Conclusions:

  • TMIGD3 isoform1 acts as a novel suppressor of NF-κB activity and osteosarcoma progression.
  • TMIGD3 i1 and A3AR represent potential therapeutic targets for osteosarcoma treatment.
  • Understanding the distinct pathways regulated by TMIGD3 i1 is crucial for developing targeted therapies.

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