DHRS9 Is a Stable Marker of Human Regulatory Macrophages

P Riquelme, G Amodio, C Macedo, A Moreau, N Obermajer, C Brochhausen, N Ahrens, T Kekarainen, F Fändrich, C Cuturi, S Gregori, D Metes, HJ Schlitt, AW Thomson, EK Geissler, JA Hutchinson

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BACKGROUND: The human regulatory macrophage (Mreg) has emerged as a promising cell type for use as a cell-based adjunct immunosuppressive therapy in solid organ transplant recipients. In this brief report, dehydrogenase/reductase 9 (DHRS9) is identified as a robust marker of human Mregs. METHODS: The cognate antigen of a mouse monoclonal antibody raised against human Mregs was identified as DHRS9 by immunoprecipitation and MALDI-MS sequencing. Expression of DHRS9 within a panel of monocyte-derived macrophages was investigated by quantitative PCR, immunoblotting and flow cytometry. RESULTS: DHRS9 expression discriminated human Mregs from a panel of in vitro derived macrophages in other polarisation states. Likewise, DHRS9 expression distinguished Mregs from a variety of human monocyte-derived tolerogenic antigen-presenting cells in current development as cell-based immunotherapies, including Tol-DC, Rapa-DC, DC-10, and PGE2-induced myeloid-derived suppressor cells. A subpopulation of DHRS9-expressing human splenic macrophages was identified by immunohistochemistry. Expression of DHRS9 was acquired gradually during in vitro development of human Mregs from CD14 monocytes and was further enhanced by IFN-γ treatment on day 6 of culture. Stimulating Mregs with 100 ng/mL lipopolysaccharide for 24 hours did not extinguish DHRS9 expression. Dhrs9 was not an informative marker of mouse Mregs. CONCLUSION: DHRS9 is a specific and stable marker of human Mregs.
Original languageEnglish
Pages (from-to)2731-2738
Number of pages8
Issue number11
Publication statusPublished - 2017

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    Riquelme, P., Amodio, G., Macedo, C., Moreau, A., Obermajer, N., Brochhausen, C., Ahrens, N., Kekarainen, T., Fändrich, F., Cuturi, C., Gregori, S., Metes, D., Schlitt, HJ., Thomson, AW., Geissler, EK., & Hutchinson, JA. (2017). DHRS9 Is a Stable Marker of Human Regulatory Macrophages. Transplantation, 101(11), 2731-2738. https://doi.org/10.1097/TP.0000000000001814