Insect Antimicrobial Peptides (AMPs) as Next-Generation Therapeutics: Structural Diversity, Molecular Regulation, Mechanisms of Action, and Translational Strategies Against Multidrug Resistance: Insect Antimicrobial Peptides (AMPs) as Next-Generation Therapeutics

AlaaEddeen Seufi; Mahamed Hamza; Fatma H. Galal

Authors

AlaaEddeen Seufi Entomology Department, Faculty of Science, Cairo University, Giza, Egypt.
M. Hamza Biology Department, College of Science, Jouf University, Aljouf, Sakaka, Saudi Arabia.
Fatma H. Galal Biology Department, College of Science, Jouf University, Aljouf, Sakaka, Saudi Arabia, and Entomology Department, Faculty of Science, Cairo University, Giza, Egypt.

Keywords:

Antimicrobial peptides, Class Insecta, Toll and Imd pathways, Peptidomimetics, Artificial Intelligence (AI), Nanocarrier drug delivery

Abstract

Background: The rapid escalation of antimicrobial resistance (AMR), particularly among the "ESKAPE" pathogens, presents an existential threat to global clinical medicine. Because conventional small-molecule antibiotics are highly vulnerable to resistance acquisition via single-nucleotide polymorphisms or horizontal gene transfer, there is an urgent need to engineer next-generation therapeutics with resilient, biophysical modes of action. Antimicrobial peptides (AMPs) derived from the Class Insecta represent an evolutionary goldmine, offering robust host-defense platforms shaped by survival in pathogen-dense ecological niches.

Objective: This review addresses a historical fragmentation in literature by providing a translation-focused synthesis that comprehensively bridges upstream molecular regulatory networks with downstream pharmacological performance and modern formulation engineering.

Methods/Structure: The manuscript structurally classifies the four primary families of insect AMPs—linear $\alpha$-helical cecropins, disulfide-stabilized cysteine-rich defensins, intracellular-targeting proline-rich peptides (PrAMPs), and macromolecular glycine-rich proteins (e.g., diptericins, attacins)—and correlates their unique structural topography with specific, multi-target mechanisms of action. Furthermore, it maps the underlying upstream activation pathways, including the Toll, Immune Deficiency (Imd), and JAK-STAT cascades, while examining complementary humoral factors and antioxidant defense systems.

Results & Discussion: While insect-derived AMPs exhibit exceptional in vitro potency, direct direct lysis mechanisms often cross-react with eukaryotic membranes, leading to mammalian cytotoxicity and hemolytic vulnerabilities. Moreover, native linear peptides suffer from rapid proteolytic degradation by host proteases, resulting in a short plasma half-life. This review evaluates how these challenges, alongside high chemical manufacturing costs and emerging microbial countermeasures (e.g., membrane remodeling, active efflux networks), have historically blocked clinical translation.

Conclusion & Future Directions: To resolve these bottlenecks, we highlight cutting-edge 2026 strategies, emphasizing how artificial intelligence (AI)-driven generative and predictive modeling accelerates the de novo design of synthetic peptides with optimized therapeutic indices. Concurrently, we detail the implementation of chemical modifications (peptidomimetics, D-amino acid substitutions, cyclization, PEGylation) and advanced nanocarrier delivery frameworks (liposomes, nanoparticles, hydrogels) to systematically shield sequences from degradation, eliminate host toxicity, and chart a definitive regulatory roadmap toward successful clinical translation.

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Insect Antimicrobial Peptides (AMPs) as Next-Generation Therapeutics: Structural Diversity, Molecular Regulation, Mechanisms of Action, and Translational Strategies Against Multidrug Resistance