Abstract
The development of novel antimicrobial agents is required to solve the problem of antimicrobial resistance. We established a quantitative method for evaluating the therapeutic efficacy of antimicrobial agents in a silkworm bacterial infection model. Pharmacokinetic factors are present in the silkworm as well as in mice, and evaluating the therapeutic efficacy of antimicrobial agents is possible in a silkworm infection model, comparable to that in a mammalian model. This silkworm model was used to screen for novel antimicrobial agents with therapeutic efficacy as an indicator. As a result, a new antibiotic, lysocin E, was discovered. Lysocin E has a completely different mechanism of action from existing antimicrobial agents, and its potent bactericidal activity leads to remarkable therapeutic efficacy in a mouse model. In this review, I describe the features of the silkworm model that have contributed to the discovery of lysocin E and its mechanisms of action.
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