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    Comparative chemical and biological evaluation of Urtica dioica extracts obtained by methanol and hexane: antioxidant, cytotoxic, apoptotic, and antimicrobial potentials
    (Bmc, 2025) Ugur, Yilmaz; Menevse, Irem Nur; Dundar, Muhammed; Karci, Huseyin; Zengin, Rukiye; Guzel, Abdussamat
    Background Urtica dioica L. is a widely utilized medicinal plant with potential antioxidant, cytotoxic, and antimicrobial properties. Methods This study aimed to investigate its multi-target biological activities across four cell lines (A549, MDA-MB-231, HCT116, and BEAS-2B) while evaluating the impact of two extraction solvents (acidified methanol and hexane) on activity outcomes. Results The acidified methanolic extract exhibited higher total phenolic (61.25 +/- 3.07 mg GAE/g) and flavonoid (51.20 +/- 2.01 mg CE/g) content, correlating with superior antioxidant activity (DPPH: 84.36 +/- 1.50 mg TE/g; CUPRAC: 174.04 +/- 9.54 mg TE/g). In contrast, the hexane extract demonstrated stronger cytotoxicity across cancer cell lines (IC50: 3.10-4.12 mu g/mL), along with significant induction of apoptosis and G0/G1 cell cycle arrest, despite lower antioxidant capacity. In addition, both extracts increased the protein levels of p21 and cleaved caspase-3, suggesting involvement of cell cycle inhibition and activation of intrinsic apoptotic signalling pathways. Moderate antimicrobial activity was also observed, with inhibition zones ranging from 7 to 10 mm across bacterial and fungal strains. Conclusions These findings highlight the bioactive potential of U. dioica and the critical role of extraction solvent in modulating its total phenolic and flavonoid contents and biological effects. The observed upregulation of p21 and cleaved caspase-3 further supports the notion that U. dioica extracts may exert antiproliferative activity through p21-mediated cell cycle control and caspase-dependent apoptosis. Further in vivo studies and mechanistic investigations are needed to confirm these observations and clarify their potential therapeutic relevance.
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    Integrated chemical and biological characterization of Hypericum perforatum extract using LC-MS/MS and in vitro functional assays
    (Nature Portfolio, 2026) Guzel, Mehmet Ali; Kolac, Turgay; Menevse, Irem Nur; Dundar, Muhammed; Zengin, Rukiye; Guzel, Abdussamat; Ugur, Yilmaz
    Hypericum perforatum L. (St. John's wort) is a medicinal plant known for its diverse secondary metabolites and pharmacological potential. This study provides a comprehensive evaluation of the phytochemical composition and bioactivities of methanolic extracts from wild H. perforatum. LC-MS/MS analysis identified 36 compounds, including phenolic acids (chlorogenic acid, protocatechuic acid) and flavonoids (rutin, isoquercitrin, quercetin), with the first-time detection of genkwanin, vicenin-2, schaftoside, and afzelin, to the best of our knowledge. The extract demonstrated significant antioxidant activity, with a total phenolic content of 203.04 mg GAE/g DW and strong radical scavenging activity in DPPH (544.78 mg TE/g DW) and ABTS (312.15 mg TE/g DW) assays. In vitro assays showed marked cytotoxicity across multiple cancer cell lines, with IC50 values as low as 3.57 & micro;g/mL in A549 cells, indicating stronger activity compared to cisplatin. Flow cytometric analysis revealed substantial apoptosis induction (up to 53.67% in A549 cells) and G0/G1 cell cycle arrest (76.37% in A549). The extract also exhibited moderate antibacterial activity against E. coli and S. aureus, but no activity against P. aeruginosa or Candida species. These results position H. perforatum as a rich source of bioactive compounds with antioxidant, anticancer, and antimicrobial potential, and suggest further research into its therapeutic applications.