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Mechanism, expression, characterization, and application of anti-opportunistic and multidrug-resistant Staphylococcus spp. antimicrobial peptides derived from Toxocara canis and Anisakis pegreffii

為了解決Lumen stock的問題，作者宋鵬飛 這樣論述：

Antibiotic-resistant in Staphylococcus species increased concern due to the numerous mortality and persistent infections worldwide. The effective conventional therapeutic drugs for various bacterial infections are severely limited, necessitating novel antimicrobial agent discovery. Antimicrobial pe

ptides (AMPs) gained increased merits due to broad-spectrum activity against microorganisms, modulate host immune response, and low risk of microorganisms developing resistance. In our study, Toxocara canis cuticular extract (Tc-CE) or Anisakis pegreffii somatic extract (Ap-SE) and recombinant prote

ins of T. canis were tested against the antibiotic susceptible and methicillin- and gentamicin-resistant Staphylococcus. The bacteriostatic concentration of Tc-CE for antibiotic susceptible Staphylococcus species was 312.50 μg ml-1 and for the MDRSA was 625.00 μg ml-1. The bactericidal concentration

was twice the bacteriostatic concentration for all the bacteria strains tested. The kill-curve kinetic assay indicated that the antibacterial activity of Tc-CE against the Staphylococcus species was concentration-dependent. Contrary, Ap-SE did not exhibit antibacterial activity against the antibiot

ic susceptible Staphylococcus and MDRSA. Therefore, Ap-SE were excluded from the study. Surrogate Caenorhabditis elegan wild type was used as an animal model to screen anti-infective potential. Tc-CE treatments enhanced various Staphylococcus species infected nematode lifespans and did not affect th

e egg laying or progeny reproduction, indicating protective activity of Tc-CE. Electron micrographs analysis delineated cell wall morphology change and disrupted bacterial cell wall and membrane in the Tc-CE treatments group. In addition, the permeabilization of the propidium iodide increased in the

treated S. aureus, indicating bacterial cell membrane was damage by Tc-CE treatments. The Tc-CE was further analyzed by gel filtration and mass spectrometry to identify that the Uc9 and Uc11 exhibit antibacterial activities. These results elucidated that T. canis proteins exhibited antibacterial ac

tivity against Staphylococcus species, and the proteins identified could be potential candidates of antimicrobial agents and pave the new pathway for future antimicrobial discovery from the parasites.