Mouse study: plasma only a limited proxy for tissue metabolism under lifespan-extending treatments
In mice given five lifespan-extending interventions, plasma metabolites did not mainly reflect any single tissue; some concordant blood–tissue changes were found, more pronounced in males, but plasma served only as a limited proxy. [1]
Automatic summary · not editorially reviewed
The key findings
Untargeted metabolomic data came from plasma, liver, gastrocnemius muscle, kidney, inguinal fat and gonadal fat of mice given caloric restriction, rapamycin, canagliflozin, 17-α estradiol or acarbose. [1]
Plasma metabolites did not primarily reflect the metabolome of a single tissue type, and concordant plasma/tissue changes were more pronounced in male than female mice. [1]
The authors conclude plasma can only serve as a limited proxy for tissue metabolism, though several potential blood biomarkers were concordant in plasma and tissues. [1]
The source at a glance
- Study type / format
- Abstract of a mouse metabolomic study
- Population / context
- Mice treated with lifespan-extending interventions
- Summary based on
- Study abstract
- Original publication
- August 25, 2026
Mouse tissues and plasma compared across five interventions
The study used untargeted metabolomic data from plasma, liver, gastrocnemius muscle, kidney, inguinal fat and gonadal fat of mice treated with lifespan-extending interventions: caloric restriction, rapamycin, canagliflozin, 17-α estradiol and acarbose. For each tissue, about 37% of identified metabolites were also found in plasma and used for comparisons. The stated aim was to test how well blood metabolite levels reflect metabolic changes in tissues.
Supporting source [1]
Concordant changes, dietary compounds and sex differences
Plasma metabolites did not primarily reflect the metabolome of a single tissue type. Caloric restriction caused the highest proportion of significantly altered metabolites detected in both organs and blood. Unsaturated triacylglycerols, diacylglycerols, amino acid derivatives and sphingomyelins showed the most concordant overlaps between four tissues and plasma, followed by carbohydrates with three tissue/plasma intersections. Concordant plasma/tissue changes were more pronounced in male than female mice. Many compounds responding similarly in tissues and plasma originated from dietary compounds, specifically ergothioneine, DHA-containing fats and diacylglycerides.
Supporting source [1]
Specific blood–tissue links and the limited proxy conclusion
Ergothioneine, previously associated with healthy aging in humans, showed concordant treatment responses in blood and all tissues except gonadal fat. DHA-containing fats were consistently regulated between blood and inguinal and gonadal adipose tissue. The kidneys showed coherent trends with blood levels for LPC 15:0, LPC 17:0 and pinitol. Under treatments with strong life-extending effects, 1,5-anhydro-glucitol blood levels were co-regulated with both liver and kidney levels. Overall, the authors conclude plasma can only serve as a limited proxy for tissue metabolism, though several potential blood biomarkers were concordant in plasma and tissues.
Supporting source [1]
How to interpret this
This is an abstract only; the full text was not reviewed. The work is in mice, so the findings do not establish human lifespan or health benefits. The abstract reports no sample sizes, follow-up durations or effect sizes, and the concordant biomarkers are described as potential, not validated.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Greenfield S, Brown CT, Fiehn O. · europepmc.org · August 25, 2026