Ivs Institute Des Vaisseaux Et Du Sang and French National Center for Scientific Research | Date: 2011-06-29
A peptide fragment of the netrin-4 protein and nucleic acids coding for the peptide are described. The peptide can inhibit endothelial cell proliferation and cell migration, as well as activate the proliferation and migration of pericytes and smooth muscle cells. Pharmaceutical formulations containing the peptide and/or the nucleic acids can be used to treat a variety of tumoral and non-tumoral pathologies.
Strategies to enhance the efficiency of endothelial progenitor cell therapy by ephrin B2 pretreatment and coadministration with smooth muscle progenitor cells on vascular function during the wound-healing process in irradiated or nonirradiated condition
Foubert P.,IVS Institute des Vaisseaux et du Sang |
Squiban C.,Institute for Radiological Protection and Nuclear Safety |
Holler V.,Institute for Radiological Protection and Nuclear Safety |
Buard V.,Institute for Radiological Protection and Nuclear Safety |
And 6 more authors.
Endothelial progenitor cell (EPC) transplantation has beneficial effects for therapeutic neovascularization. We therefore assessed the effect of a therapeutic strategy based on EPC administration in the healing of radiation-induced damage. To improve cell therapy for clinical use, we used pretreatment with ephrin B2-Fc (Eph-B2-Fc) and/or coadministration with smooth muscle progenitor cells. At day 3, EPCs promoted dermal wound healing in both nonirradiated and irradiated mice by 1.2- and 1.15-fold, respectively, compared with animals injected with phosphate-buffered saline. In addition, EPCs also improved skin-blood perfusion and capillary density in both irradiated and nonirradiated mice compared with PBS-injected animals. We also demonstrated that activation with Eph-B2-Fc increased wound closure by 1.6-fold compared with unstimulated EPCs in nonirradiated mice. Interestingly, the beneficial effect of Eph-B2-Fc was abolished in irradiated animals. In addition, we found that Eph-B2-Fc stimulation did not improve EPC-induced vascular permeability or adhesiveness compared to unstimulated EPCs. We hypothesized that this effect was due to high oxidative stress during irradiation, leading to inhibition of EPCs' beneficial effect on vascular function. In this line, we demonstrated that, in irradiated conditions, N-acetyl-L-cysteine treatment restored the beneficial effect of EPC stimulation with Eph-B2-Fc in the wound healing process. In conclusion, stimulation by Eph-B2-Fc improved the beneficial effect of EPCs in physiological conditions and irradiated conditions only in association with antioxidant treatment. Additionally, cotherapy was beneficial in pathological conditions. © 2015 Cognizant Comm. Corp. Source