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Ultraviolet exposure of melanoma cells induces fibroblast activation protein-alpha in fibroblasts: Implications for melanoma invasion
Linköping University, Department of Clinical and Experimental Medicine, Dermatology and Venerology. Linköping University, Faculty of Health Sciences.
Linköping University, Department of Clinical and Experimental Medicine, Dermatology and Venerology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Center, Department of Dermatology and Venerology.
Queens University Belfast, UK.
Ryhov Hospital, Jönköping.
2011 (English)In: International Journal of Oncology, ISSN 1019-6439, Vol. 39, no 1, 193-202 p.Article in journal (Refereed) Published
Abstract [en]

Fibroblast activation protein-alpha (FAP-alpha) promotes tumor growth and cell invasiveness through extracellular matrix degradation. How ultraviolet radiation (UVR), the major risk factor for malignant melanoma, influences the expression of FAP-alpha is unknown. We examined the effect of UVR on FAP-alpha expression in melanocytes, keratinocytes and fibroblasts from the skin and in melanoma cells. UVR induces upregulation of FAP-alpha in fibroblasts, melanocytes and primary melanoma cells (PM) whereas keratinocytes and metastatic melanoma cells remained FAP-alpha negative. UVA and UVB stimulated FAP-alpha-driven migration and invasion in fibroblasts, melanocytes and PM. In co-culture systems UVR of melanocytes, PM and cells from regional metastases upregulated FAP-alpha in fibroblasts but only supernatants from non-irradiated PM were able to induce FAP-alpha in fibroblasts. Further, UV-radiated melanocytes and PM significantly increased FAP-alpha expression in fibroblasts through secretory crosstalk via Wnt5a, PDGF-BB and TGF-beta 1. Moreover, UV radiated melanocytes and PM increased collagen I invasion and migration of fibroblasts. The FAP-alpha/DPPIV inhibitor Gly-ProP(OPh)(2) significantly decreased this response implicating FAP-alpha/DPPIV as an important protein complex in cell migration and invasion. These experiments suggest a functional association between UVR and FAP-alpha expression in fibroblasts, melanocytes and melanoma cells implicating that UVR of malignant melanoma converts fibroblasts into FAP-alpha expressing and ECM degrading fibroblasts thus facilitating invasion and migration. The secretory crosstalk between melanoma and tumor surrounding fibroblasts is mediated via PDGF-BB, TGF-beta 1 and Wnt5a and these factors should be evaluated as targets to reduce FAP-alpha activity and prevent early melanoma dissemination.

Place, publisher, year, edition, pages
Spandidos Publications , 2011. Vol. 39, no 1, 193-202 p.
Keyword [en]
FAP-alpha; UV irradiation; melanoma; fibroblast; invasion
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-69844DOI: 10.3892/ijo.2011.1002ISI: 000291504900022OAI: diva2:433452
Available from: 2011-08-10 Created: 2011-08-08 Last updated: 2017-12-08Bibliographically approved

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Wäster, PetraRosdahl, Inger
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