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‘Triple G’ Agonist Hits New Weight-Loss Heights
A novel triple agonist to receptors for three nutrient-stimulated hormones led to weight loss as high as 24% among people with overweight or obesity but who did not have type 2 diabetes when used at the highest tested dose for 48 weeks. The results are from a phase 2 study of retatrutide that was published in The New England Journal of Medicine on August 9.
This level of weight loss is “unprecedented” for a medication administered for 48 weeks, commented Mary-Elizabeth Patti, MD in an editorial that accompanied the report.
The three hormones that the retatrutide molecule simultaneously mimics are glucagon-like peptide-1 (GLP-1), such as agents in the class of GLP-1 agonists that includes liraglutide (Victoza/Saxenda) and semaglutide (Ozempic/Wegovy); the glucose-dependent insulinotropic polypeptide (GIP), the receptor that is also activated by tirzepatide (Mounjaro), a dual-incretin receptor agonist that mimics both GLP-1 and GIP; and glucagon. Survodutide is a dual GLP-1 and glucagon receptor agonist in phase 2 development.
The highest dose of retatrutide safely produced an average 17.5% drop from baseline weight, compared with an average 1.6% reduction in the placebo group, after 24 weeks, a significant difference.
Retatrutide is currently unique among agents with reported clinical results by having agonist effects on the receptors for all three of these hormones, a property that led Patti to call retatrutide a “triple G” hormone-receptor agonist in her editorial.
Treatment with retatrutide was also significantly associated with improvements in several cardiometabolic measures in exploratory analyses, including systolic and diastolic blood pressure, A1c, fasting glucose, insulin, and some (but not all) lipids, reported Jastreboff, director of the Yale Obesity Research Center of Yale University in New Haven, Connecticut, and her co-authors in the NEJM article.
The safety profile of retatrutide was consistent with reported phase 1 findings for the agent among people with type 2 diabetes and resembled the safety profiles of other agents based on GLP-1 or GIP–GLP-1 mimicry for the treatment of type 2 diabetes or obesity.
The most frequently reported adverse events from retatrutide were transient, mostly mild to moderate gastrointestinal events. They occurred primarily during dose escalation. Discontinuation of retatrutide or placebo because of adverse events occurred in 6% to 16% of the participants who received retatrutide and in none of the participants who received placebo.
N Engl J Med. Published online August 8, 2023. Abstract, Editorial
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