722-P: Tirzepatide Improves Multiple Aspects of Beta-Cell Function

We investigated the effect of tirzepatide (TZP) 15 mg (novel GIP-GLP-1 dual receptor agonist) , placebo and semaglutide 1 mg (SEMA) on beta-cell function using euglycaemic and hyperglycemic glucose clamps (EGC, HGC) and Mixed Meal Tolerance Tests (MMTT) in a 28-week double-blind randomized controlled trial of people with type 2 diabetes. During EGC and HGC, TZP improved insulin sensitivity (M-value) , first and second phase insulin secretion (ISR) and beta-cell glucose sensitivity (ratio of ISR and glucose increments) more than SEMA and placebo (Table; EASD symposium 2021) . During MMTT, both fasting and AUC glucose were reduced more with TZP than with SEMA or placebo, while incremental glucose AUC was reduced with TZP and SEMA vs. placebo similarly. Despite similarly reduced incremental glucose AUC, insulin AUC and incremental insulin AUC were reduced by TZP but not by SEMA. Model-derived beta-cell glucose sensitivity was increased with TZP and SEMA from baseline similarly. In contrast, ISR at 7.2 mmol/L glucose increased more with TZP than with placebo and SEMA (Table) . The glucose-lowering effect of TZP is mediated through improvements in multiple aspects of beta-cell function, including beta-cell glucose sensitivity and ISR, and in insulin sensitivity, resulting in pronounced lowering of fasting and postprandial glucose. These effects help explain the superior improvement in glucose control seen with TZP vs. comparators in clinical trials. Disclosure A. Mari: Consultant; Lilly. Research Support; Lilly. J. Li: Employee; Eli Lilly and Company. Stock/Shareholder; Eli Lilly and Company. S. Urva: Employee; Eli Lilly and Company. T. Heise: Advisory Panel; Novo Nordisk A/S. Research Support; ADOCIA, AstraZeneca, Biocon, Boehringer Ingelheim International GmbH, Crinetics Pharmaceuticals, Inc., Eli Lilly and Company, Gan & Lee Pharmaceuticals, Genova, Nestlé, Neuraly Inc., Novo Nordisk A/S, Sanofi, Zealand Pharma A/S. Speaker's Bureau; Eli Lilly and Company, Gan & Lee Pharmaceuticals, Novo Nordisk A/S. J. De Vries: Advisory Panel; ADOCIA, Novo Nordisk A/S, Zealand Pharma A/S. Speaker's Bureau; Novo Nordisk A/S. E.J. Pratt: Employee; Eli Lilly and Company. R.J. Heine: Employee; Eli Lilly and Company. M.K. Thomas: Employee; Eli Lilly and Company. Stock/Shareholder; Eli Lilly and Company. Z. Milicevic: Employee; Eli Lilly and Company. K.J. Mather: Employee; Eli Lilly and Company. Stock/Shareholder; Eli Lilly and Company. Funding Eli Lilly and Company