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

  • Symposium: Molecular Genetics in Sarcoma
  • Published:
Clinical Orthopaedics and Related Research

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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Acknowledgments

We thank Dr Matthew Warman for the DNLRP5 construct, Dr Marian Waterman for the TCF luciferase constructs, and Dr Randall F. Holcombe for technical advice.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Musculoskeletal Oncology Laboratory, 101 The City Drive South, Orange, CA, 92868, USA

    Yi Guo MD, PhD, Elyssa M. Rubin MD, Jun Xie BA & Bang H. Hoang MD

  2. Department of Urology, University of California, Irvine, CA, USA

    Xiaolin Zi MD, PhD

Authors
  1. Yi Guo MD, PhD
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  2. Elyssa M. Rubin MD
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  3. Jun Xie BA
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  4. Xiaolin Zi MD, PhD
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  5. Bang H. Hoang MD
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Corresponding author

Correspondence to Bang H. Hoang MD.

Additional information

One or more of the authors has received funding from the Aircast Foundation, the Orthopaedic Research and Education Foundation, and National Institutes of Health CA116003 (BHH); and the Neil Chamberlain Research Fund and National Institutes of Health CA109428 (XZ).

Each author certifies that his or her institution has approved the human and animal protocols for this investigation for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.

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Guo, Y., Rubin, E.M., Xie, J. et al. Dominant Negative LRP5 Decreases Tumorigenicity and Metastasis of Osteosarcoma in an Animal Model. Clin Orthop Relat Res 466, 2039–2045 (2008). https://doi.org/10.1007/s11999-008-0344-y

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  • DOI: https://doi.org/10.1007/s11999-008-0344-y

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