Biogenic synthesis of bioactive zinc nanoparticles from cyanobacterial Nostoc sp. MK-7 for biomedical applications

= 55 ± 5 µg/mL). Importantly, the nanoparticles significantly reduced viability of MDA-MB-231 breast cancer cells by inducing apoptosis, as confirmed by Annexin V-FITC/PI staining and flow cytometry. Furthermore, MK-7 ZnO NPs suppressed nitric oxide production and downregulated IL-6 secretion and mRNA expression, demonstrating potent anti-inflammatory and anticancer effects. Overall, the findings highlight the successful biosynthesis of structurally stable, hexagonal MK-7 ZnO NPs with enhanced antioxidant, anti-inflammatory, anti-wrinkle, and anticancer activities. These results underscore the promising potential of MK-7 ZnO NPs as multifunctional therapeutic agents, warranting further in vivo investigations for clinical translation.