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Identification, paracrine generation, and possible function of human breast carcinoma myofibroblasts in culture

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Summary

Myofibroblasts from human breast carcinomas were identified and experimentally generated in culture, and a possible function was examined. The frequency ofα-smooth muscle actin immunoreactive cells was evaluated as a measure of myofibroblast differentiation in primary culture. Few or noα-smooth muscle actin-positive stromal cells (6.1 ± 8.4%) were identified in primary cultures from normal breast tissue (n=9). In contrast, high frequencies (68.8 ± 15.1%) were observed in primary cultures from carcinomas (n=19). The frequencies of myofibroblasts in primary cultures were almost identical to those obtained in the corresponding cryostat sections (69.1 vs. 68.8%). A possible precursor cell to the myofibroblast was looked for among typical fibroblasts and vascular smooth muscle cells. Purified blood vessels containing both fibroblasts and vascular smooth muscle cells were embedded in collagen gel and incubated with medium conditioned by breast epithelial cells. Fibroblasts rather than smooth muscle cells were recruited from the blood vessels. In medium conditioned by carcinoma cell lines or in co-cultures of carcinoma cell lines and purified fibroblasts,α-smooth muscle actin and the typical myofibroblast phenotype were induced in otherwiseα-smooth muscle actin-negative fibroblasts. The effect of myofibroblasts on cellular movement—essential to neoplastic cells—was analyzed. Spontaneous motility of tumor cells (MCF-7) was entirely suppressed in a collagen gel assay. Under these conditions tumor cell motility was selectively mediated by direct cell-to-cell interaction between tumor cells and myofibroblasts. Under chemically defined conditions, interaction was dependent on the presence of plasminogen. Anti-plasminogen, soybean trypsin inhibitor, and anti-fibronectin partly neutralized the effect of plasminogen. It is concluded that elements of myofibroblast differentiation and function may be studied in culture.

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Authors and Affiliations

  1. Structural Cell Biology Unit, Department of Anatomy, The Panum Institute, University of Copenhagen, DK-2200, Copenhagen N

    Lone Rønnov-Jessen, Bo van Deurs & Ole W. Petersen

  2. Laboratory of Tumor Endocrinology, The Fibiger Institute of The Danish Cancer Society, DK-2100, Copenhagen Ø

    Lone Rønnov-Jessen & Ole W. Petersen

  3. Department of Pathology, Bispebjerg Hospital, DK-2400, Copenhagen NV

    Maja Nielsen

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  1. Lone Rønnov-Jessen
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  4. Ole W. Petersen
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Rønnov-Jessen, L., van Deurs, B., Nielsen, M. et al. Identification, paracrine generation, and possible function of human breast carcinoma myofibroblasts in culture. In Vitro Cell Dev Biol - Animal 28, 273–283 (1992). https://doi.org/10.1007/BF02634244

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  • DOI: https://doi.org/10.1007/BF02634244

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