RT Journal Article T1 Antitumor Activity, Mechanisms of Action and Phytochemical Profiling of Sub-Fractions Obtained from Ulex gallii Planch. (Fabaceae): A Medicinal Plant from Galicia (Spain) A1 Bada, Lucía A1 Butt, Hussain Shakeel A1 Quezada González, Elías Neftalí A1 Picos Martínez, Aitor A1 Wangensteen, Helle A1 Inngjerdingen, Kari Tvete A1 Gil Longo, José A1 Viña Castelao, María Dolores K1 U. gallii K1 Sub-fractions K1 Neuroblastoma K1 Glioblastoma K1 Cell cycle K1 Apoptosis AB The plant kingdom serves as a valuable resource for cancer drug development. This study explored the antitumor activity of different sub-fractions (hexane, dichloromethane and methanol) of U. gallii (gorse) methanol extract in glioblastoma (U-87MG and U-373MG) and neuroblastoma (SH-SY5Y) cell lines, along with their phytochemical profiles. Cytotoxicity was evaluated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assays, and cell cycle arrest and apoptosis were assessed through flow cytometry and by measuring reactive oxygen species (ROS) and protein expression levels. D7 and D8 dichloromethane sub-fractions significantly reduced cell viability, triggered early apoptosis in SH-SY5Y and U-87MG cells and specifically increased ROS levels in U-87MG cells. Western blot analyses showed that D7 increased p53, caspase-3, caspase-8 and γH2AX expression in SH-SY5Y and U-87MG cells, while D8 specifically elevated p53 in SH-SY5Y cells and caspase-3 in both cell lines. In U-373 cells, D7 and D8 markedly reduced cell viability, with D8 inducing necrosis. Morphological changes indicative of apoptosis were also observed in all cell lines. Bioinformatic analysis of UHPLC-MS and GC-MS data tentatively identified 20 metabolites in D7 and 15 in D8, primarily flavonoids. HPLC-DAD confirmed isoprunetin and genistein as the most abundant in D7 and D8, respectively, both isolated and identified by NMR spectroscopy. Most of the flavonoids identified have been reported as antitumor agents, suggesting that these compounds may be responsible for the observed pharmacological activity. PB MDPI YR 2025 FD 2025 LK https://hdl.handle.net/10347/40968 UL https://hdl.handle.net/10347/40968 LA eng NO Bada, L., Butt, H. S., Quezada, E., Picos, A., Wangensteen, H., Inngjerdingen, K. T., Gil-Longo, J., & Viña, D. (2025). Antitumor Activity, Mechanisms of Action and Phytochemical Profiling of Sub-Fractions Obtained from Ulex gallii Planch. (Fabaceae): A Medicinal Plant from Galicia (Spain). Molecules, 30(4), 972. https://doi.org/10.3390/molecules30040972 NO Xunta de Galicia: Grants for the consolidation and structuring of competitive research units of the SUG, 2023–2026 (EDT431C 2023/22. Research group GPC GI-1862) NO Partly supported by the Research Council of Norway through the Norwegian NMR Platform, NNP (226244/F50) NO L.B. thanks Deputación de A Coruña (BIND-CS/2020) DS Minerva RD 28 abr 2026