Protein-loaded cellular nanosponges for dual-biomimicry neurotoxin countermeasure

Summary

This preclinical study develops a dual-biomimetic nanosponge against saxitoxin, using two natural defense concepts in the same particle. The outer coating consists of human neuronal membrane, which imitates host cells and intercepts toxin through the interactions responsible for neuronal injury. Inside a metal–organic framework core, the researchers load saxiphilin, a natural saxitoxin-binding protein associated with toxin-resistant organisms. The combination is therefore intended to provide functional decoy binding at the surface and high-affinity molecular capture within the core. In vitro, neuronal swelling, calcium-flux, and cytotoxicity assays showed improved detoxification by the complete formulation. In mouse models of saxitoxin intoxication, the nanosponges produced significant survival benefits when given after exposure and when used prophylactically. The abstract reports no apparent acute toxicity. The principal finding is that mimicking both a vulnerable host target and a naturally resistant organism can strengthen one neurotoxin countermeasure beyond either concept alone. This establishes a modular strategy for pairing membrane recognition with a protective protein payload. The abstract does not quantify synergy, define treatment timing, compare existing antidotes, assess chronic safety, or demonstrate activity against neurotoxins other than STX.