Summary
Breast carcinomas contain both tumor cells and stromal cells, including fibroblasts, endothelial cells, and lymphocytes. Proliferation of breast cancer cells may be controlled partly by mesenchymal cells, especially fibroblasts. We studied effects of fibroblasts on tumorigenicity and histologic features of breast cancer cells vivo, and analyzed fibroblast-produced growth-promoting factors in vitro. Breast carcinoma cells from four lines, and fibroblasts from lines obtained from skin and breast tissue of four patients with breast cancer were used. A suitable number of breast tumor cells and fibroblasts were inoculated subcutaneously into nude mice; resulting tumors were examined. Then conditioned medium from fibroblasts was added to cultures of breast cancer cells to study growth effects, and growth-promoting factors from breast fibroblasts were analyzed. Co-inoculation of breast cancer cells with breast fibroblasts into mice significantly increased tumorigenicity and tumor size beyond those obtained with breast cancer cells alone. Histologically, tumors resulting from co-inoculation with breast fibroblasts showed a scirrhous pattern with extensive fibrosis, while those formed by breast cancer cells injected alone or co-inoculation with skin fibroblasts showed a solid pattern. Medium from breast fibroblasts significantly increased breast cancer cell growth in vitro, while the various skin fibroblasts did not all show this effect. Structural and functional interactions between organ-specific fibroblasts and breast cancer cells may importantly regulate breast cancer growth and progression.
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Abbreviations
- CM:
-
conditioned medium
- DMEM:
-
Dulbecco’s modified Eagle medium
- FCS:
-
fetal calf serum
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Yashiro, M., Ikeda, K., Tendo, M. et al. Effect of organ-specific fibroblasts on proliferation and differentiation of breast cancer cells. Breast Cancer Res Treat 90, 307–313 (2005). https://doi.org/10.1007/s10549-004-5364-z
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DOI: https://doi.org/10.1007/s10549-004-5364-z