Usefulness of cell-penetrating peptides to improve intestinal insulin absorption

Journal of Controlled Release : Official Journal of the Controlled Release Society
Noriyasu KameiKozo Takayama

Abstract

Cell-penetrating peptides (CPPs) are a useful tool for delivering therapeutic macromolecules across cell membranes. We previously devised an approach using CPPs without intermolecular cross-linking and showed the efficient delivery of insulin from the intestine to the systemic circulation using a typical CPP, oligoarginine. However, this approach required relatively high doses of the CPP. Therefore, this study aimed to identify CPPs that are more effective for the delivery of insulin and do not induce toxic effects on the intestine. In this study, we examined the effects of various types of CPPs including arginine-rich peptides and amphipathic peptides that aid insulin absorption from rat ileal segments. Among these peptides, coadministration of insulin with R8, penetratin, pVEC, and RRL helix significantly increased ileal insulin absorption compared with insulin administration alone. In the case of R8, the D-form of the peptide had stronger absorption enhancing ability than the L-form. In contrast, the other three peptides exerted a more significant effect when the L-forms were applied, and L-penetratin had the strongest ability to enhance intestinal insulin absorption. Meanwhile, in a physical mixture of CPP and insulin, aggr...Continue Reading

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