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Metastasis02:30

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Metastasis is the spread of cancer cells from the original site to distant locations in the body. Cancer cells can spread via blood vessels (hematogenous) as well as lymph vessels in the body.
Epithelial-to-Mesenchymal Transition
The epithelial-to-mesenchymal transition or EMT is a developmental process commonly observed in wound healing, embryogenesis, and cancer metastasis. EMT is induced by transforming growth factor-beta (TGF-β) or receptor tyrosine kinase (RTK) ligands, which further...
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Models of Bone Metastasis
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Macrofluidic recirculating model of skeletal metastasis.

Takahiro Osawa1, Wenchu Wang1, Jinlu Dai1

  • 1Department of Urology, University of Michigan, Michigan, USA.

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This study introduces a novel macrofluidic model for studying cancer metastasis, incorporating actual tissues to better understand tumor cell migration and growth in bone environments.

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Area of Science:

  • Oncology
  • Biomedical Engineering
  • Cell Biology

Background:

  • Microfluidic models of metastasis lack tissue complexity.
  • Existing models are limited in their ability to replicate the tumor microenvironment.

Purpose of the Study:

  • To develop an in vitro macrofluidic model for studying tumor cell migration and bone metastasis.
  • To incorporate complex tissue environments into metastasis research.
  • To investigate the role of the bone microenvironment in metastasis.

Main Methods:

  • A macrofluidic system was created using culture plates and collagen-coated tubing with recirculating media.
  • Prostate carcinoma cells were cultured in hydrogels or xenografts at primary tumor sites.
  • Bone stromal cells or bone chips were used as metastatic sites.
  • Cell migration, growth, and the CXCL12 gradient were analyzed.
  • AMD3100 was used to inhibit CXCL12 function.

Main Results:

  • Prostate cancer cells successfully migrated from primary to metastatic bone sites and grew.
  • Bone significantly enhanced tumor cell growth and established a CXCL12 gradient favoring metastatic sites.
  • Inhibition of CXCL12 function reduced cancer cell targeting of bone.

Conclusions:

  • A macrofluidic metastasis model was successfully developed, incorporating tumor and metastatic tissues.
  • The model effectively simulates chemotaxis and allows for the inclusion of tumor heterogeneity and intact microenvironments.
  • This system holds promise for identifying mechanisms and therapeutics for bone metastasis.