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July 5th, 2025
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Stanford University
bioengineering
biorxiv

Long-acting hydrogel-based depot formulations of tirzepatide and semaglutide for the management of type 2 diabetes and weight

d'Aquino, A. I.Open in Google Scholar•Dong, C.Open in Google Scholar•Nguyen, L. T.Open in Google Scholar•Yan, J.Open in Google Scholar•Jons, C. K.Open in Google Scholar•Saouaf, O. M.Open in Google Scholar•Song, Y. E.Open in Google Scholar•Eckman, N.Open in Google Scholar•Kapasi, S.Open in Google Scholar•Williams, C. M.Open in Google Scholaret al.

Several incretin hormone therapies have been clinically approved and have revolutionized the treatment of diabetes and obesity. Promising therapeutics include semaglutide (Ozempic and Wegovy), an agonist for glucagon-like peptide-1 (GLP-1) receptor, and tirzepatide (Mounjaro), a dual agonist for GLP-1 and glucose-dependent insulinotropic polypeptide (GIP) receptors. These molecules help to regulate blood glucose levels, enhance insulin secretion and sensitivity, and reduce appetite. Currently, these treatments require weekly injections, which can be challenging for patients to adhere to. We recently reported the development of an injectable hydrogel depot technology enabling months-long release of semaglutide (Sema). Here, we further develop this technology for improved prolonged release of both Sema and tirzepatide (TZP). In a rat model of diabetes, we show a single administration of hydrogel-based formulations of either Sema or TZP maintained relevant drug levels for over 6 weeks. In these studies, single administrations of long-acting hydrogel-based therapies of Sema or TZP were similarly effective at regulating blood glucose and weight compared to daily injections of either Sema or TZP in standard aqueous vehicles. This hydrogel depot technology is easy to manufacture, injectable, and exhibits excellent biocompatibility, enabling months-long-acting treatments with the potential to improve management of diabetes and weight.

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