GEOapplication/xmlftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE334nnn/GSE334430/primaryOK200TranscriptomicsHomo sapiensExpression profiling by high throughput sequencinghttps://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE334430GEOGSEfalseBioinspired TIMP-1 Nanoparticles Mimic Extracellular Vesicle Anti-angiogenic Activity in Ewing SarcomaAnti-angiogenic therapies targeting the VEGF/VEGFR axis have achieved transient benefits, as tumors rapidly activate compensatory vascular programs. Here, we present a bioinspired nanoplatform that reproduces the anti-angiogenic signaling of mesenchymal stromal cell-derived extracellular vesicles (EVs) by delivering the endogenous metalloproteinase inhibitor TIMP-1. Poly(methyl methacrylate) nanoparticles (NP_TIMP1) were engineered to retain TIMP-1 bioactivity, inhibit matrix metalloproteinase (MMP) activity, and selectively target endothelial cells. In vitro, NP_TIMP1 suppressed endothelial sprouting and tip-cell formation in 2D and 3D microfluidic systems. In zebrafish patient-derived xenografts of Ewing sarcoma, NP_TIMP1 localized to tumor-associated vessels and significantly reduced vascular infiltration, reproducing the efficacy of TIMP-1-enriched EVs. In contrast, soluble TIMP-1 failed to elicit these effects, indicating that nanoparticle-mediated delivery enhances protein stability and spatial engagement with the endothelium. This study establishes TIMP-1 as a key stromal regulator of angiogenesis and demonstrates that EV-mimetic nanoparticles can recapitulate its therapeutic potential, providing a scalable bioengineering approach to overcome the limitations of natural vesicles and develop next- generation anti-angiogenic nanotherapeutics.2026/09/11GSE334430GSM9788610GSM9788611GSM9788609GSM9788607GSM9788608GSM9788605GSM9788606GSM9788612GSM978861324676334430Homo sapiens