Oral Delivery of Semaglutide and Tirzepatide Using Milk-Derived Small Extracellular Vesicles.
This study investigated whether milk-derived small extracellular vesicles (sEVs) could serve as oral delivery vehicles for two GLP-1 receptor agonists (GLP-1RAs): semaglutide and tirzepatide. Researchers loaded both peptides onto sEVs in vitro and administered them orally to diabetic db/db mice—a well-established mouse model of type 2 diabetes. The study found that both peptides were efficiently incorporated into the sEV carrier system and that oral administration of the loaded vesicles effectively reduced blood glucose levels in the diabetic mice. The authors compared this approach to the existing SNAC (sodium N-[8-(2-hydroxybenzoyl) amino] caprylate) technology used in the commercially approved oral semaglutide formulation (Rybelsus), arguing that sEVs offer broader applicability across multiple peptide drugs, not just semaglutide. Key limitations include the exclusive use of an animal model with no human pharmacokinetic or efficacy data, a relatively small and homogeneous study design, and the early-stage, preclinical nature of the platform. Translation to humans remains undemonstrated.
Why this grade: All efficacy and glucose-lowering data were generated exclusively in db/db mice; no human or clinical data were presented.
Therapeutic proteins and peptides have revolutionized modern biomedicine, but their oral delivery is limited by gastrointestinal degradation and barriers. Small extracellular vesicles (sEVs), which are resistant to biochemical degradation and capable of traversing mucus and cellular barriers, hold great promise as next-generation oral delivery vehicles. Oral semaglutide, the first approved oral GLP-1 receptor agonist (GLP-1RA), employs vesicle-mediated transcellular transport, highlighting the potential of sEVs as an effective delivery vehicle. In this study, we demonstrate the successful oral delivery of two GLP-1RAs, semaglutide and previously unexplored tirzepatide, using milk-derived sEVs. Both peptides were efficiently loaded onto sEVs in vitro, and their oral administration effectively reduced blood glucose levels in diabetic db/db mice. Compared with the current SNAC technology, which is limited exclusively to semaglutide, our sEV platform provides broader applicability and versatility for oral peptide drug delivery.
Educational summary of published research — not medical advice. License: cc by-nc-nd. Full text is shown only where licensing permits.