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Bone morphogenetic protein 7 polarizes THP-1 cells into M2 macrophages

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It was hypothesized that monocyte treatment with bone morphogenetic protein 7 (BMP7) would significantly enhance monocyte polarization into M2 macrophages as well as increasing the levels of anti-inflammatory cytokines. In a cell culture system using monocytes (human acute monocytic leukemia cell line THP-1), we studied the effects of BMP7 on monocytes polarizing into M2 macrophages. The data demonstrate that THP-1 cells contain a BMP type II receptor (BMPR2), and that its activation is significantly (p < 0.05) increased following treatment with BMP7. Furthermore, there was an increase of M2 macrophages, BMPR2, and anti-inflammatory cytokines interleukin (IL)-10 and IL-1ra compared with the respective controls. Moreover, treatment with BMP7 caused a significant (p < 0.05) decrease in the levels of pro-inflammatory cytokines IL-6, tumour necrosis factor (TNF-α), and monocyte chemotactic protein-1 (MCP-1), compared with the controls. In conclusion, we suggest for the first time that BMP7 has a unique potential to polarize monocytes into M2 macrophages, required for tissue repair, which will have significant applications for the treatment of atherosclerosis.
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Keywords: IL-10; atherosclerosis; athérosclérose; macrophages; monocytes

Document Type: Rapid Communication

Publication date: July 4, 2012

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