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VEGF-A and Tenascin-C produced by S100A4+ stromal cells are important for metastatic colonization
Increased numbers of S100A4+ cells are associated with poor prognosis in patients who have cancer. Although the metastatic capabilities of S100A4+ cancer cells have been examined, the functional role of S100A4+ stromal cells in metastasis is largely unknown. To study the contribution of S100A4+ stro...
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Published in: | Proceedings of the National Academy of Sciences - PNAS 2011-09, Vol.108 (38), p.16002-16007 |
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Main Authors: | , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Increased numbers of S100A4+ cells are associated with poor prognosis in patients who have cancer. Although the metastatic capabilities of S100A4+ cancer cells have been examined, the functional role of S100A4+ stromal cells in metastasis is largely unknown. To study the contribution of S100A4+ stromal cells in metastasis, we used transgenic mice that express viral thymidine kinase under control of the S100A4 promoter to specifically ablate S100A4+ stromal cells. Depletion of S100A4+ stromal cells significantly reduced metastatic colonization without affecting primary tumor growth. Multiple bone marrow transplantation studies demonstrated that these effects of S100A4+ stromal cells are attributable to local non–bone marrow-derived S100A4+ cells, which are likely fibroblasts in this setting. Reduction in metastasis due to the loss of S100A4+ fibroblasts correlated with a concomitant decrease in the expression of several ECM molecules and growth factors, particularly Tenascin-C and VEGF-A. The functional importance of stromal Tenascin-C and S100A4+ fibroblast-derived VEGF-A in metastasis was established by examining Tenascin-C null mice and transgenic mice expressing Cre recombinase under control of the S100A4 promoter crossed with mice carrying VEGF-A alleles flanked by loxP sites, which exhibited a significant decrease in metastatic colonization without effects on primary tumor growth. In particular, S100A4+ fibroblast-derived VEGF-A plays an important role in the establishment of an angiogenic microenvironment at the metastatic site to facilitate colonization, whereas stromal Tenascin-C may provide protection from apoptosis. Our study demonstrates a crucial role for local S100A4+ fibroblasts in providing the permissive "soil" for metastatic colonization, a challenging step in the metastatic cascade. |
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ISSN: | 0027-8424 1091-6490 |
DOI: | 10.1073/pnas.1109493108 |