In vivo tibial compression decreases osteolysis and tumor formation in a human metastatic breast cancer model / Exercise could reduce bone tumor growth

http://www.ncbi.nlm.nih.gov/pubmed/?term=In+vivo+tibial+compression+decreases+osteolysis+and+tumor
http://www.news.cornell.edu/stories/2013/05/exercise-could-reduce-bone-tumor-growth
http://medicalxpress.com/news/2013-05-bone-tumor-growth.html

De:


Lynch, M. E., Brooks, D., Mohanan, S., Lee, M. J., Polamraju, P., Dent, K., Bonassar, L. J., van der Meulen, M. C. H. and Fischbach, C. (2013), In vivo tibial compression decreases osteolysis and tumor formation in a human metastatic breast cancer model. J Bone Miner Res, 28: 2357–2367. doi: 10.1002/jbmr.1966

Author Information

  1. 1
    Biomedical Engineering, Cornell University, Ithaca, NY, USA
  2. 2
    Biomedical Sciences, School of Veterinary Medicine, Cornell University, Ithaca, NY, USA
  3. 3
    Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, USA
  4. 4
    Research Division, Hospital for Special Surgery, New York, NY, USA
  5. 5
    Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY, USA

    In vivo tibial compression decreases osteolysis and tumor formation in a human metastatic breast cancer model.

    Abstract

    Bone metastasis, the leading cause of breast cancer-related deaths, is characterized by bone degradation due to increased osteoclastic activity. In contrast, mechanical stimulation in healthy individuals upregulates osteoblastic activity, leading to new bone formation. However, the effect of mechanical loading on the development and progression of metastatic breast cancer in bone remains unclear. Here, we developed a new in vivo modelto investigate the role of skeletal mechanical stimuli on the development and osteolytic capability of secondary breast tumors. Specifically, we applied compressive loading to the tibia following intratibial injection of metastatic breast cancer cells (MDA-MB231) into the proximal compartment of female immunocompromised (SCID) mice. In the absence of loading, tibiae developed histologically-detectable tumors with associated osteolysis and excessive degradation of the proximal bone tissue. In contrast, mechanical loading dramatically reduced osteolysis and tumor formation and increased tibial cancellous mass due to trabecular thickening. These loading effects were similar to the baseline response we observed in non-injected SCID mice. In vitro mechanical loading of MDA-MB231 in a pathologically relevant 3D culture model suggested that the observed effects were not due to loading-induced tumor cell death, but rather mediated via decreased expression of genes interfering with bone homeostasis. Collectively, our results suggest that mechanical loading inhibits the growth and osteolytic capability of secondary breast tumors after their homing to the bone, which may inform future treatment of breast cancer patients with advanced disease.
    © 2013 American Society for Bone and Mineral Research.

    KEYWORDS:

    BREAST CANCER; MECHANICAL LOADING; METASTASIS; OSTEOLYSIS

    Compresión tbial en vivo disminuye la osteolisis y formación de tumores en un modelo de cáncer de mama metastásico humano / El ejercicio podría reducir el crecimiento del tumor óseo


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