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Journal: Materials Today Bio
Article Title: Human iPSC-EV-loaded nanofiber stent coatings accelerate vascular repair by enhancing EGFR/HIF-1α signaling and suppressing ROCK1-mediated remodeling
doi: 10.1016/j.mtbio.2026.103564
Figure Lengend Snippet: In vivo evaluation of re-endothelialization and inhibition of intimal hyperplasia following stent implantation. (A–E) SEM images of the luminal surface treated with EV-loaded (A, B) or DPBS-loaded (D, E) nanofibrous membranes. The EV-treated group exhibited a continuous, smooth, and intact endothelial layer (A, B), whereas the DPBS group displayed incomplete coverage with substantial endothelial disruption (D, E). (C, F) H&E-stained cross-sections revealed the extent of neointimal formation above the stent struts (black arrows). The EV group (C) demonstrated significantly reduced intimal thickening compared with the pronounced hyperplasia observed in the DPBS group (F). (G–H) Statistical analysis confirmed that EV treatment significantly increased endothelial coverage (G) and suppressed intimal hyperplasia thickness (H). (I–K) EV treatment significantly upregulated the expression of the angiogenic factor VEGF (I), the endothelial marker CD31 (J), and the proliferation marker PCNA (K), confirming accelerated vascular repair. (L–N) EV treatment prevented phenotypic switching and matrix accumulation, as evidenced by reduced levels of the contractile/hyperplasia marker α-SMA (L). Furthermore, the EV group showed decreased expression of matrix metalloproteinases MMP-2 and MMP-9 (M) and beneficial modulation of collagen composition, with increased Collagen I and the Collagen I/III ratio (N). (O–P) The EV group exhibited significantly downregulated levels of the profibrotic factor TGF-β1 (O) and the inflammatory cytokine IL-6 (P). N = 5 (G and H), and n = 3 (I-P). * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.000.
Article Snippet: Proliferation and remodeling markers: PCNA (1:1000, ab29, Abcam), IL-6 (1:1000, A0286, ABclonal), TGF-β1 (1:1000, A2124, ABclonal),
Techniques: In Vivo, Inhibition, Disruption, Staining, Expressing, Marker