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Antecedent Metabolic Health and Metformin (ANTHEM) Aging Study: Rationale and Study Design for a Randomized

Santosh Kumari1,2, Matthew T Bubak3, Hayden M Schoenberg1,2

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Metformin, an antidiabetic drug, may target aging. This study investigates its effects on insulin sensitivity and muscle mitochondria in healthy adults, revealing potential differences based on baseline metabolic health.

Keywords:
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Area of Science:

  • Gerontology and Metabolic Health
  • Pharmacology and Aging Research
  • Skeletal Muscle Physiology

Background:

  • Metformin, an antidiabetic medication, is being investigated for its potential to target aging and extend healthspan.
  • Epidemiological studies suggest health benefits of metformin in patient populations, but its effects on healthy individuals are unclear.
  • Previous research indicated metformin's effects on insulin sensitivity and muscle mitochondria differ based on baseline insulin sensitivity when combined with exercise.

Purpose of the Study:

  • To determine if baseline metabolic health and skeletal muscle mitochondrial function mediate metformin's effects on aging.
  • To assess metformin's impact on metabolism and aging biology independent of exercise.
  • To identify mechanisms modulating metformin's effectiveness in targeting aging.

Main Methods:

  • A 12-week randomized, double-blind, placebo-controlled trial involving 148 healthy adults (40-75 years old).
  • Participants stratified by insulin resistance (homeostatic model assessment of insulin resistance ≤2.2 or ≥2.5) received 1500 mg/day metformin or placebo.
  • Primary outcomes assessed via hyperinsulinemic-euglycemic clamps and skeletal muscle biopsies before and after treatment.

Main Results:

  • Metformin's effects on insulin sensitivity and skeletal muscle mitochondria varied based on participants' baseline insulin sensitivity.
  • Insulin-resistant individuals showed positive adaptations, while insulin-sensitive individuals experienced no change or detrimental effects.
  • This suggests antecedent metabolic health is a key factor in metformin's response.

Conclusions:

  • Metformin's efficacy in targeting aging may depend on an individual's baseline metabolic health and skeletal muscle mitochondrial status.
  • Findings could inform larger trials investigating metformin as an anti-aging therapeutic.
  • Further research is needed to elucidate the precise mechanisms involved.