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Clinical & Experimental Metastasis

, Volume 9, Issue 2, pp 151–162 | Cite as

Modulation of clonal progression in B16F1 melanoma cells

  • J. F. Harris
  • A. F. Chambers
  • A. S. K. Tam
Research Papers

Abstract

We have examined the effects of the microenvironment on the frequency and generation of metastatic variant cells in both parental B16F1 melanoma cells and nascent clones. The metastatic abilities of cultured B16F1 cells were tested after a period of growth in the presence or absence of a second cell population separated from each other by a transwell membrane (0.45μm pore size). The first population is defined as the ‘responder’ cells and the second as the ‘stimulator’ cells. We found that the presence of 105 B16F1 stimulator cells during the growth of responder B16F1 cells from ∼104 to ∼106 cells resulted in cells with an increased metastatic phenotype (> 8-fold increase in median number of lung tumors relative to untreated B16F1 parental cells). The presence of stimulator cells also increased the metastatic phenotype of nascent clones, which were grown to a population size of <106 cells, suggesting that the rate of generation of metastatic variants of the responder B16F1 clones was affected by the stimulator cells. Other cell lines, including highly metastatic B16F10 and BL6 melanoma cells, and KHT35-L1 fibrosarcoma cells, were effective stimulator cells when as few as 104 cells were added to transwells. In addition, normal immortalized NIH 3T3 cells were effective stimulator cells only at 105 cells/transwell. The cell density at which untreated parental B16F1 cells were harvested (3×103−3 × 105 cells/cm2) did not affect the median number of lung tumors significantly. These results suggest that factors released from both tumor and immortalized normal cells can modulate epigenetic changes in the metastatic phenotype of B16F1 melanoma cells.

Keywords

Fibrosarcoma Stimulator Cell B16F1 Cell Metastatic Phenotype B16F1 Melanoma Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Rapid Communications of Oxford Ltd 1991

Authors and Affiliations

  • J. F. Harris
    • 1
    • 2
  • A. F. Chambers
    • 1
    • 2
  • A. S. K. Tam
    • 1
    • 2
  1. 1.London Regional Cancer CentreLondonCanada
  2. 2.Departments of Oncology, Microbiology and ImmunologyUniversity of Western OntarioLondonCanada

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