TNF-alpha Modulates the Migratory Response of Mesenchymal Stem Cells to TRAIL
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The number of circulating mesenchymal stem cells (MSC), analyzed after acute myocardial infarction (AMI), was lower in AMI patients who developed heart failure (HF) in the follow-up. Conversely, the circulating levels of tumor necrosis factor (TNF)-alpha, and osteoprotegerin (OPG) were higher in AMI patients who developed HF with respect to the patients who did not develop HF. In vitro exposure to TNF-alpha enhanced the migration of MSC in response to TNF-related apoptosis-inducing ligand (TRAIL) and significantly increased the release of OPG by endothelial cells. On the contrary, OPG dose-dependently neutralized the in vitro pro-migratory activity of TRAIL. Thus, TNF-alpha exhibits opposite effects on MSC migration driven by TRAIL: it is capable of potentiating MSC migration as well as of inhibiting MSC migration as an indirect consequence of OPG induction, which might result in a suboptimal recruitment of circulating MSC after AMI in those patients who develop HF in the follow-up.
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