Sea Anemone Stichodactyla Haddoni Venom: Extraction Method Dictates Composition and Functional Potency.

Sea anemone venoms contain diverse toxins that have significant pharmacological potential, including anticancer, ecticidal, and immunotherapeutic properties. However, critically, the extraction methodology influences venom composition and bioactivity. This study characterized venom from Stichodactyla haddoni obtained via homogenization, electrical stimulation, and milking. Extraction yields varied significantly between methods: the homogenization, electrical stimulation, and milking of healthy sea anemones yielded crude venoms at rates of 17.8%, 3.4%, and 1.5%, respectively. SDS-PAGE revealed distinct protein banding patterns and concentrations, while RP-HPLC demonstrated method-dependent compositional differences. Comprehensive proteomic profiling identified 2370 proteins, encompassing both unique and shared components across extraction techniques. Label-free quantitative analysis confirmed significant variations in protein abundance that was attributable to the extraction method. Cytotoxicity assays against cancer cell lines revealed concentration-dependent inhibition, with milking-derived venom exhibiting the highest potency. Insecticidal activity against Tenebrio molitor was also method-dependent, with milking venom inducing the highest mortality rate. These findings elucidate the profound impact of extraction methodology on the protein composition and functional activities of S. haddoni venom, providing crucial insights for its optimized exploitation in pharmacological development.