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Rejuva GLP-1-based pancreatic gene therapy candidate results in greater weight loss vs. semaglutide

Fractyl Health has revealed preclinical findings from its Rejuva gene therapy platform at the European Association for the Study of Diabetes (EASD) 2023 Annual Meeting. The oral presentation, titled, ‘Pancreatic Gene Therapy Durably Improves Glycemia and Delays Disease Progression in a Murine Model of Type 2 Diabetes,’ highlighted the promising implications of the Rejuva platform in potentially reshaping the treatment landscape for T2D and obesity with a GLP-1 based pancreatic gene therapy candidate (GLP-1 PGTx) designed to target the pancreas to provide long-term metabolic benefits from a single administration.

The Rejuva platform focuses on developing next-generation adeno-associated virus (AAV)-based, locally delivered gene therapies for the treatment of T2D and obesity. The Rejuva platform is in preclinical development and has not yet been evaluated by regulatory agencies for investigational or commercial use. Rejuva leverages advanced delivery systems and proprietary screening methods to identify and develop metabolically active gene therapy candidates targeting the pancreas. The program aims to transform the management of metabolic diseases by offering novel, disease-modifying therapies that address the underlying root causes of disease.

“The success of gene therapies in a number of rare diseases may now open the door to sustained benefit from gene therapy for more common diseases, like obesity and T2D,” said Dr Mark Kay, Professor of Pediatrics and Genetics at Stanford University Medical School and Fractyl Health's Scientific Advisor. “Results now in two efficacy models for GLP-1 PGTx and toxicology studies accumulating thus far suggest that local administration of gene therapy to the pancreas may now be feasible for society’s most vexing chronic diseases.”


During the oral presentation, the company presented late-breaking results from an additional, second efficacy model of metabolic disease, the well-validated DIO rodent model of obesity. A single dose of a GLP-1 PGTx was vs. chronic semaglutide 10nmol/kg/day in a head-to-head study. GLP-1 PGTx demonstrated improved weight loss compared to semaglutide at day 15, with 24.8% weight loss for GLP-1 PGTx vs. 18.4% weight loss for semaglutide (p<0.01 for the difference between a GLP-1 PGTx and semaglutide, n=10 in each arm).

Harith Rajagopalan

Given the short time frame, weight loss had not yet plateaued in either arm by day 15 of the study. Both semaglutide and GLP-1 PGTx treatment arms saw reduced food intake compared to vehicles that persisted through day 15, providing a mechanistic explanation for the weight loss in these animals. The data presented corroborates the fundamental hypothesis that local delivery of a GLP-1 PGTx, driven by the insulin promoter, can potentially provide sustained weight loss after a single administration in obese subjects.


“The power of the GLP-1 mechanism in obesity and T2D is obvious, but we also know we need treatments for T2D and obesity that work even after patients stop taking them,” said Dr Harith Rajagopalan, CEO of Fractyl Health. “Our goal with our Rejuva platform is to develop gene therapy candidates that can durably change the trajectory of both obesity and T2D, and today’s results further consolidate preclinical proof-of-concept data for the viability of this approach.”


Fractyl Health anticipates progressing its GLP-1 PGTx through lead optimization and IND-enabling toxicity studies in 2024.

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