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Generation of directly reprogrammed human endothelial cells derived from fibroblast using ultrasound.

Physical microenvironment plays an important role in determining cellular reprogramming. In this study, we first generated directly reprogrammed human dermal fibroblasts (HDFs) into endothelial cells (ECs) mediated by environmental transition-guided cellular reprogramming (e/Entr) using ultrasound and characterized e/Entr. Ultrasound stimulus was introduced to ECs culture media and HDFs and induced into ECs-like cells. We performed microarray, RT-PCR, protein analysis, matrigel plug assay and e/Entr were transplanted into ischemic hindlimb mice model. Here we show that the activation of MAPK signaling pathways and the modulation of histone proteins such as Hp1-α, H3K27me3 and H3K4me3 in e/Entr contribute to the changes in chromatin configuration and reprogramming. Microarray data demonstrated that e/Entr highly expressed genes associated with ECs transcription factors and angiogenesis. In addition, the transplantation of e/Entr into hindlimb ischemia showed a high recovery of blood perfusion, limb salvage and e/Entr contributed to the formation of new vessels. In conclusion, the present study provided the first evidence that ultrasound reprogramming can induce postnatal cells to functional ECs. Therefore, our data suggest that physical stimulus-mediated reprogramming is a highly effective and safe strategy for the novel therapeutic alternatives.

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