Short‐Term Hypoxia Enhances the Migratory Capability of Dendritic Cell Through HIF‐1α and PI3K/Akt Pathway

In this study we observed an enhanced migratory capability of human monocyte‐derived DC, using in vitro migration assays performed under hypoxic conditions. Such enhancement was independent on either the chemoattractants involved or the maturation level of DC. However, HIF‐1α appeared to be crucial for the migration only of immature DC and not for mature DC under hypoxia, as indicated by HIF‐1α siRNA approaches. Furthermore, we observed that while Akt phosphorylation was enhanced in both immature and mature DC exposed to hypoxia, other signaling pathways, such as p38 and p42/p44 MAPK, were differently affected during hypoxic treatment. More interestingly, aspecific and specific inhibition of PI3K/Akt indicated that such pathway was relevant for the migration of both immature and matured DC under hypoxia, even when DC were transfected with HIF‐1α siRNA. Our results indicate that, besides HIF‐1α, several other pathways, including PI3K/Akt, may be involved in the response to hypoxia of immature and, more specifically, of mature DC to sustain their trafficking and functions within hypoxic microenvironments. J. Cell. Physiol. 9999: XX–XX, 2014. © 2014 Wiley Periodicals, Inc.

Source: Journal of Cellular Physiology - May 12, 2014 Category: Cytology Authors: Irene Filippi, Emilia Morena, Carlo Aldinucci, Fabio Carraro, Silvano Sozzani, Antonella Naldini Tags: Original Research Article Source Type: research