AAV‑FGF21 Gene Therapy Extends Health Span and Lifespan in Aged Mice

The Numbers

Sample size: not disclosed in the abstract. Reported outcomes are qualitative descriptions of lifespan extension and multi‑organ improvements in aged mice.

Context: What This Study Is

Jimenez and colleagues at the Center of Animal Biotechnology and Gene Therapy (CBATEG) conducted an AAV‑mediated gene therapy experiment. The team delivered a muscle‑directed adeno‑associated viral (AAV) vector encoding fibroblast growth factor 21 (FGF21) to aged male and female mice. The purpose was to test whether sustained FGF21 expression could counteract age‑related functional decline across several organ systems.

What This Result Means

Elevated circulating FGF21 from the muscle appeared to rebalance whole‑body energy homeostasis. Transcriptomic and histopathological readouts suggested enhanced mitochondrial capacity, restored proteostasis, and dampened inflammation, fibrosis, and amyloid deposition. Activation of AMPK signaling aligns with known pathways that promote cellular repair and metabolic efficiency, offering a mechanistic link to the observed physiological benefits.

Study Limitations

• The abstract provides no quantitative metrics (e.g., percent lifespan increase, p‑values), limiting assessment of effect magnitude.


• Absence of a reported sample size prevents evaluation of statistical power and reproducibility.


• Findings are confined to a murine model; translation to human physiology remains untested.

Practical Application

It is too early to apply this protocol to personal health optimization. Human trials that assess safety, dosing, and efficacy across diverse age groups are required before any actionable recommendations can be derived.

Disclaimer: This article is for informational and educational purposes only. The information presented does not constitute medical advice, diagnosis, or treatment. Consult a qualified healthcare professional before modifying your diet, supplementation, or exercise routines. The scientific studies cited reflect the state of knowledge at their publication date and may be subject to revision.