Wang, Z.; Yan, J.; Liu, T.; Zhu, J.; Ma, Y.; Li, N.; Fan, W.; Wang, J.; Shen, H. Evaluation of the Therapeutic Effect of Fly Maggot Antimicrobial Peptide in Staphylococcus aureus-Induced Mouse Mastitis Model. Preprints2023, 2023111282. https://doi.org/10.20944/preprints202311.1282.v1
APA Style
Wang, Z., Yan, J., Liu, T., Zhu, J., Ma, Y., Li, N., Fan, W., Wang, J., & Shen, H. (2023). Evaluation of the Therapeutic Effect of Fly Maggot Antimicrobial Peptide in Staphylococcus aureus-Induced Mouse Mastitis Model. Preprints. https://doi.org/10.20944/preprints202311.1282.v1
Chicago/Turabian Style
Wang, Z., Jungang Wang and Hong Shen. 2023 "Evaluation of the Therapeutic Effect of Fly Maggot Antimicrobial Peptide in Staphylococcus aureus-Induced Mouse Mastitis Model" Preprints. https://doi.org/10.20944/preprints202311.1282.v1
Abstract
Staphylococcus aureus(S. aureus) is associated with mastitis in dairy cows, this study investigates the therapeutic effect of maggot antimicrobial peptides on S. aureus induced mastitis in mice. The maggot AMP was isolated and purified, tested for antimicrobial activity, and used to treat a pathological model of rat mastitis. The concentration of 1.5mg/（Kg. BW）AMP was selected as intramammary treatment in S. aureus-induced mastitis in mice. The mice were divided into four groups of 30 mice each: group I (healthy control), group II (disease control), group III (AMP), and group IV (ciprofloxacin). To evaluate the therapeutic efficacy of maggot AMP in mastitis induced by S. aureus based on clinical presentation, mammary gland structure, bacterial load, histopathology, and cure. During the 7-day treatment period, all the mice in Group II died in the afternoon of the fifth day, and the clinical signs of the mice in Group III began to improve on the third day, as evidenced by the gradual recovery of the mice's mental status, dietary intake, and water intake. During the treatment period, the bacterial load count of Group III was significantly lower than that of Group II but higher than that of Group IV, while the bacterial load count of Group III gradually decreased and approached that of Group IV from the fifth to the seventh day. The levels of TNF-α in groups III and IV were significantly lower than those in group II, suggesting that maggot AMP has a certain inhibitory effect on TNF-α. Treatment with AMP@ 1.5 mg/(Kg. BW) showed restoration of clinical signs, reduced bacterial load, and lower TNF-α levels in mice, leading to significant improvement in histopathological changes as compared to disease controls. The final cure rate was 40% for mice in Group III compared to 70% for mice in Group IV, compared to all mice in Group II that died. From this study, it can be concluded that maggot AMP can be used as a potential alternative treatment option to antibiotics for the treatment of bovine mastitis.
Biology and Life Sciences, Animal Science, Veterinary Science and Zoology
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