Vibegron: A Novel Treatment for Multisystem Functional Decline in Aging and Obesity
openNIA - National Institute on Aging
PROJECT SUMMARY
Aging is characterized by the gradual loss of physiological integrity, and this process may be accelerated in the
presence of obesity, increasing susceptibility to disease, frailty, and death. Although the shared molecular
pathways involved have not been fully elucidated, adipose tissue dysfunction is likely a key contributor to
multisystem functional decline in aging and obesity. Despite growing evidence that β3 adrenergic receptor
{β3AR) mediated activation of brown adipose tissue {BAT) may alter pathophysiological pathways implicated in
various aging-related diseases including metabolic, cardiovascular, and neurodegenerative diseases, BAT has
been largely ignored in aging research. In this highly innovative study, we propose to conduct a randomized,
double-blind, placebo-controlled trial to investigate whether treatment with a β3AR agonist (vibegron) can
improve energy metabolism, cardiometabolic risk factors, and physical and cognitive function. Vibegron
{Gemtesa) was FDA-approved in 2020 for the treatment of overactive bladder and has greater selectivity,
potency, and activity at the β3AR than other agonists studied to date. This presents a timely opportunity to
explore pharmacological activation of β3ARs as a way to improve multiple health outcomes relevant in aging
and obesity. To test our hypothesis, 40 middle-aged and older adults {45-75 yrs) with obesity will be
randomized to vibegron {75 mg/day) or placebo for 12 weeks to compare their effects on various bioenergetic,
cardiometabolic, physical function, and cognitive outcomes. Specifically, in Aim 1 we will assess the effects of
vibegron vs. placebo on energy expenditure, core body temperature, mitochondrial bioenergetics, and
thermogenic protein expression. In Aim 2 we will assess the effects of vibegron vs. placebo on glucose and
insulin indices, lipid levels, body composition, and body fat distribution. In Aim 3 we will assess the effects of
vibegron vs. placebo on self-report and objective measures of lower extremity function, muscle strength and
pOY1er, global cognition, memory, executive function, quality of life, and depression. Notable innovations
include blood-based bioenergetic profiling to assess systemic mitochondrial function, isolation and
characterization of adipose tissue-derived small extracellular vesicles to assess target engagement, and
continuous monitoring of core body temperature to assess circadian thermoregulation. In exploratory analyses
we will compare the effects of vibegron vs. placebo on the accumulation of health deficits {i.e., frailty) and the
preservation of physical and mental abilities {i.e., intrinsic capacity), two integrated measures of phenotypic
aging that will provide estimates of the potential for vibegron to impact multisystem functional decline. This
unique study will be the first clinical trial to explore the potential to repurpose vibegron for the treatment of
aging-related obesity and associated comorbidities. If successful, the results of this study will be used to inform
the design of a larger, longer trial to confirm the efficacy of vibegron as a novel treatment to IOY1er risk for
multisystem functional decline in both aging and obesity.
Up to $426K
health research