Genetic modification of human adipose-derived stem cells for promoting wound healing

Background: Diverse growth factors secreted from human adipocyte-derived stem cells (hASCs) that support or manage adjacent cells have been studied for therapeutic potentials to a variety of pathological models. However, senescent growth arrest in hASCs during in vitro culture and subsequent defective differentiation potential, have been technical barriers to further genetic modification of hASCs for functional improvement. Objective: We investigated the feasibility of long-term hASC culture to enhance their therapeutic use. Methods: We used a MYC variant to generate hASCs expressing v-myc and determined their growth potential and growth factor secretion profile. We further introduced an AICT variant to generate constitutively active (CA)-Akt/v-myc hASCs. Finally, we tested the ability of promoting wound healing of medium conditioned with CA-Akt/v-myc hASCs. Results: The v-myc hASCs actively proliferated longer than control hASCs. Increased secretion of vascular endothelial growth factor (VEGF) by v-myc hASCs promoted the migration potential of hASCs and vasculogenesis in co-cultured endothelial cells. Additional genetic modification of v-myc hASCs using CA-Akt further increased VEGF secretion. In addition, injection of CA-Akt/v-myc hASCs-CM into wound-mice model promoted wound healing compared to normal hASCs-CM. Conclusion: Genetic modification of hASCs to stimulate secretion of growth factors is a novel strategy to maximize their paracrine effect and improve their therapeutic potential. (C) 2012 Japanese Society for Investigative Dermatology. Published by Elsevier Ireland Ltd. All rights reserved.