Hyperuricemia (HU), a common metabolic disorder, is characterized by elevated serum uric acid (sUA) levels. Uricase, an enzyme that degrades uric acid(UA) into allantoin, is absent in humans due to a nonsense mutation. Messenger RNA (mRNA)-based protein replacement therapy, known for its efficiency and transient expression, has garnered significant research attention. This study focuses on developing a mRNA therapy for HU using human ancestral uricase ANC19, delivered via lipid nanoparticles (LNPs). We prepared ANC19-LNPs, characterized their physicochemical properties, and evaluated their expression and function in Huh7 cells. Results indicate successful preparation and characterization of ANC19-mRNA, which localizes to peroxisomes and demonstrates UA degradation capability in vitro. Biodistribution was validated in Balb/c mice. Concurrently, a HU mouse model was successfully established using siRNA-mediated knockdown of Uricase-mRNA. In HU mouse models, ANC19-LNPs achieved a 75.63 % UA degradation rate. To validate these promising findings in a more clinically relevant species, the therapy was evaluated in cynomolgus monkeys, where it also showed a therapeutic effect, the area under the curve (AUC) of the concentration-time curve for ANC19-LNPs was 32.647 h∗μg/mL compared to 67.074 h∗μg/mL for the negative control. Biochemical blood tests in cynomolgus monkeys confirmed the safety of ANC19-LNPs. In conclusion, we have successfully developed an effective mRNA-based protein replacement therapy for UA degradation, showing promising efficacy and safety in both in vitro and in vivo studies.
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