| خلاصه مقاله | Background and Aim : Up to present, numerous attempts have been collected in the favor of cell-based therapies by using sophisticated methodologies and delivery approaches. Micro-capsules have potential to provide safe micro-environment for cells delivery during transplantation in a physiological 3D milieu.
Methods : Here, we investigate the impact of alginate gelatin encapsulation on angiogenic potential of human endothelial cells after 5 days. Human umbilical vein endothelial cells were encapsulated by alginate-gelatin substrate and kept in vitro for 5 days. Cell survival assay (MTT) and autophagy PCR array analysis were used to study HUVECs survival rate. To monitor angiogenesis capacity, cell distribution of Tie-1, VEGFR-1, and VEGFR-2 and Tie-2, were measured by ELISA. In addition to in vitro tubulogenesis assay, we measured the protein level of VE-cadherin by Western blotting. The migration of encapsulated HUVECs was confirmed by measuring MMP-2 and MMP-9 activity via gelatin zymography. The in vivo angiogenic potential of encapsulated HUVECs was analyzed in immune-compromised mouse implant model during 7 days post-transplantation.
Results : Encapsulation increased HUVECs cell survival and proliferation rate. Compared to the control, no significant differences were observed in autophagic response of encapsulated cells (p > 0.05). The cell distribution of Tie-1, Tie-2, VEGFR-1, and VEGFR-2 were induced, but did not reach to significant levels. Encapsulation suppressed MMP-2, -9 activities while increased the VE-cadherin peptide in enclosed cells (p < 0.05). Moreover, an enhanced in vivo angiogenic response of encapsulated HUVECs was evident as compared to non-capsulated cells (p < 0.05).
Conclusion : Data suggest that alginate-gelatin encapsulation induces angiogenic response of endothelial lineage in in vivo and in vitro conditions. |