Overexpression of insulin-like growth factor binding protein-6 inhibits rhabdomyosarcoma growth in vivo

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Induction of Mesenchymal-Epithelial Transitions in Sarcoma Cells
11:42

Induction of Mesenchymal-Epithelial Transitions in Sarcoma Cells

Published on: April 7, 2017

M A Gallicchio1, M Kneen, C Hall

  • 1Department of Medicine, University of Melbourne, Austin and Repatriation Medical Centre (Austin Campus) Heidelberg, Victoria, Australia.

International Journal of Cancer
|December 18, 2001
PubMed

Insights

Insulin-like growth factor binding protein-6 (IGFBP-6) inhibits rhabdomyosarcoma growth by reducing proliferation and increasing apoptosis. This protein significantly reduces tumor size in vivo, suggesting its therapeutic potential for this childhood cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Rhabdomyosarcoma, a common pediatric soft-tissue sarcoma, exhibits overexpression of insulin-like growth factor-II (IGF-II).
  • IGF-II acts as an autocrine growth factor, while IGFBP-6 inhibits its activity and is linked to myoblast quiescence.
  • Low IGFBP-6 expression is observed in rhabdomyosarcoma cells, potentially contributing to tumor growth.

Purpose of the Study:

  • To investigate the effects of IGFBP-6 on rhabdomyosarcoma cell lines (RD and Rh30).
  • To determine IGFBP-6's impact on proliferation, apoptosis, and tumor growth in vitro and in vivo.
  • To elucidate the role of IGF-II in mediating IGFBP-6's effects on rhabdomyosarcoma.

Main Methods:

  • Treatment of RD and Rh30 rhabdomyosarcoma cell lines with varying doses of IGFBP-6.
  • Assays for anchorage-dependent and anchorage-independent growth, including soft agar and polyhydroxyethylmethacrylate-coated plates.
  • Stable transfection of Rh30 cells with IGFBP-6 cDNA and establishment of subcutaneous xenografts in nude mice.

Main Results:

  • IGFBP-6 significantly inhibited anchorage-dependent and anchorage-independent growth of rhabdomyosarcoma cells in a dose-dependent manner.
  • IGFBP-6 treatment led to a 4-fold increase in apoptosis in RD cells, partially reversed by IGF-II.
  • Subcutaneous xenografts of IGFBP-6-overexpressing Rh30 cells showed dramatic size reduction (up to 88%) compared to controls.

Conclusions:

  • IGFBP-6 effectively inhibits rhabdomyosarcoma proliferation and promotes apoptosis in vitro.
  • IGFBP-6 significantly suppresses rhabdomyosarcoma xenograft growth in vivo, partly via IGF-II inhibition.
  • Restoration of IGFBP-6 expression may represent a potential therapeutic strategy for rhabdomyosarcoma.

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