alexa Interleukin-17 augments tumor necrosis factor-alpha-induced elaboration of proangiogenic factors from fibroblasts.
Medicine

Medicine

Anatomy & Physiology: Current Research

Author(s): Numasaki M, Lotze MT, Sasaki H

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Abstract Interleukin-17 (IL-17) is a CD4 T cell cytokine. In this report, we investigated the effects of this cytokine on the elaboration of proangiogenic factors by lung fibroblasts. After stimulation with a wide range of doses of IL-17, fibroblasts produced more amount of various kinds of angiogenic factors including NO, HGF, MCP-1, KC, MIP-2, PGE1, PGE2 and VEGF in a dose-dependent manner. Treatment with a COX-1 and COX-2 inhibitor indomethacin did not impair IL-17-induced HGF and VEGF secretion in fibroblasts. In addition, TNF-alpha alone stimulated the elaboration of KC, MIP-2, PGE2 and VEGF in fibroblasts. IL-17 and TNF-alpha in combination up-regulated elaboration of these proangiogenic factors additively or synergistically. Moreover, conditioned media (CM) from IL-17-stimulated fibroblasts showed significantly higher activity on endothelial cell growth than those from non-treated control cells. These results indicate that IL-17 up-regulates elaboration of various proangiogenic factors, and modulates macrophage-derived TNF-alpha-induced production of KC, MIP-2, PGE2 and VEGF by fibroblasts. Our findings also demonstrate that IL-17 might be a potential contributor to the inflammatory angiogenesis via induction of proangiogenic factors by stromal fibroblasts. This article was published in Immunol Lett and referenced in Anatomy & Physiology: Current Research

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