Lack of Hmox1 in MSC does not affect their immunomodulatory properties or secretory profile. Number of circulating CD3+ T cells (A), CD3+AnnexinV+ apoptotic T cells (B), or activated CD3+CD4+CD25high T cells (C) in control mice or injected i.v. with MSC Hmox1+/+ or Hmox1−/− (N = 3–4). Concentration of G-CSF (D), IL-6 (E), LIF (F), LIX (G), CXCL1 (H), MCP-1 (I), RANTES (J), and VEGF (K) in conditioned media from Hmox1+/+ or Hmox1−/−MSC assessed with multiplex assay on Luminex platform. Data are shown as mean ± SD, Mann–Whitney, N = 4.