Clinical Orthopaedics and Related Research

, Volume 466, Issue 9, pp 2039–2045

Dominant Negative LRP5 Decreases Tumorigenicity and Metastasis of Osteosarcoma in an Animal Model

  • Yi Guo
  • Elyssa M. Rubin
  • Jun Xie
  • Xiaolin Zi
  • Bang H. Hoang
Symposium: Molecular Genetics in Sarcoma

Abstract

Osteosarcoma (OS) is a primary malignant bone tumor with a high propensity for local recurrence and distant metastasis. We previously showed a secreted, dominant-negative LRP5 receptor (DNLRP5) suppressed in vitro migration and invasion of the OS cell line SaOS-2. Therefore, we hypothesized DNLRP5 also has in vivo antitumor activity against OS. We used the 143B cell line as a model to study the effect of DNLRP5 by stable transfection. Inhibition of Wnt signaling by DNLRP5 was verified by a reduction in TOPFLASH luciferase activity. In soft agar, DNLRP5-transfected 143B cells formed fewer and smaller colonies than control transfected cells. DNLRP5 transfection reduced in vivo tumor growth of 143B cells in nude mice. DNLRP5 also decreased in vitro cellular motility in a scratch wound assay. In a spontaneous pulmonary metastasis model, DNLRP5 reduced both the size and number of lung metastatic nodules. The reduction in cellular invasiveness by DNLRP5 was associated with decreased expression of matrix metalloproteinase-2, N-cadherin, and Snail. Our data suggest canonical Wnt/LRP5 signaling reflects an important underlying mechanism of OS progression. Therefore, strategies to suppress LRP5-mediated signaling in OS cells may lead to a reduction in local or systemic disease burden.

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Copyright information

© The Association of Bone and Joint Surgeons 2008

Authors and Affiliations

  • Yi Guo
    • 1
  • Elyssa M. Rubin
    • 1
  • Jun Xie
    • 1
  • Xiaolin Zi
    • 2
  • Bang H. Hoang
    • 1
  1. 1.Department of Orthopaedic SurgeryMusculoskeletal Oncology LaboratoryOrangeUSA
  2. 2.Department of UrologyUniversity of CaliforniaIrvineUSA

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