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Human mesenchymal stem cells (hMSCs), including human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs), which have high proliferation capacity and immunomodulatory properties, are considered to be a good candidate for cell-based therapies. hMSCs show enhanced therapeutic effects via paracrine secretion or cell-to-cell contact that modulates inflammatory or immune reactions. Here, treatment with cobalt chloride (CoCl 2 ) was more effective than naïve hUCB-MSCs in suppressing inflammatory responses in a coculture system with phytohemagglutinin- (PHA-) activated human peripheral blood mononuclear cells (hPBMCs). Furthermore, the effect of CoCl 2  is exerted by promoting the expression of anti-inflammatory mediators (e.g., PGE 2 ) and inhibiting that of inflammatory cytokines (e.g., TNF- α  and IFN- γ ). Treatment of hUCB-MSCs with CoCl 2  leads to increased expression of microRNA- (miR-) 146a, which was reported to modulate anti-inflammatory responses. Hypoxia-inducible factor- (HIF-) 1 α  silencing and ERK inhibition abolished CoCl 2 -induced miR-146a expression, suggesting that ERK and HIF-1 α  signals are required for CoCl 2 -induced miR-146a expression in hUCB-MSCs. These data suggest that treatment with CoCl 2  enhances the immunosuppressive capacity of hUCB-MSCs through the ERK-HIF-1 α -miR-146a-mediated signaling pathway. Furthermore, pretreatment of transplanted MSCs with CoCl 2  can suppress lung inflammation more than naïve MSCs can in a mouse model of asthma. These findings suggest that CoCl 2  may improve the therapeutic effects of hUCB-MSCs for the treatment of inflammatory diseases.

stem cells international

Cobalt Chloride Enhances the Anti-Inflammatory Potency of Human Umbilical Cord Blood-Derived Mesenchymal Stem Cells through the ERK-HIF-1<i>α</i>-MicroRNA-146a-Mediated Signaling Pathway

Cobalt Chloride Enhances the Anti-Inflammatory Potency of Human Umbilical Cord Blood-Derived Mesenchymal Stem Cells through the ERK-HIF-1α-MicroRNA-146a-Mediated Signaling Pathway