Oral insulin pill breakthrough
Japanese researchers at Kumamoto University report a new oral insulin pill that survives the digestive tract by using a unique peptide — potentially replacing daily insulin injections. The team calls it a solution to a ‘long‑held dream’ in diabetes care, and press coverage highlights its potential to change standard insulin delivery if human trials confirm efficacy and safety. (mirror.co.uk)
The findings were published on November 24, 2025 in the journal Molecular Pharmaceutics under the title “Small intestine‑permeable cyclic peptide‑based technology enables efficient oral delivery and glycemic efficacy of zinc‑stabilized insulin hexamer and its analogs in diabetic mice.” (kumamoto-u.ac.jp ) The study’s lead author is doctoral student Shoma Chikamatsu and the research group is led by Associate Professor Shingo Ito from Kumamoto University’s Faculty of Life Sciences, with coauthors including Kosei Sakaguchi and Masataka Michigami. (kumamoto-u.ac.jp ) Researchers tested two delivery strategies: an interaction‑based “mixing” approach using a D‑form DNP‑V carrier peptide mixed with zinc‑stabilized insulin hexamers, and a covalent “click‑chemistry” DNP‑insulin conjugate; both approaches produced glucose‑lowering effects in mice. (ScienceDaily ) The team reported a pharmacological bioavailability of about 33–41% for the oral formulations relative to subcutaneous insulin, a marked improvement over prior oral attempts that often required more than tenfold higher doses. (EurekAlert! ) Efficacy was demonstrated in multiple diabetic mouse models, including chemically induced streptozotocin (STZ) mice and a genetic “Kuma” mouse line, where single oral doses reduced blood glucose to near‑normal levels and once‑daily dosing for three days produced consistent effects. (SciTechDaily ) The authors say next steps include pharmacokinetic testing in human intestinal models and translational studies in larger animals, and the project has received support from Japan’s AMED, JSPS grants, and JST SPRING funding. (News‑Medical / Kumamoto University )
