Method expands protein detection in low-volume mouse serum
The workflow increased protein coverage 3–6-fold and identified 3,992 groups of proteins from 20 microliters of mouse serum.
Cross-sectional study
Edited by Boris Djordjevic · AgingResearch.News
In a cross-sectional analysis, researchers examined serum—the liquid left after blood clots—from 30 mice aged 12, 24 and 30 months. They used tiny particles to help detect more proteins with mass spectrometry, a technique for identifying and measuring molecules.
The analysis revealed age- and sex-specific protein differences. It also detected proteins associated with senescence, a state in which cells stop dividing. A second assay used one additional microliter of serum to measure 43 cytokines, immune signaling proteins not detected by mass spectrometry. Comparison with human plasma data from the Baltimore Longitudinal Study of Aging identified age-associated circulating proteins shared by mice and humans. Several of these proteins were linked to frailty in humans.
Why it matters
Developing measures of biological aging requires ways to assess candidate markers in mice. The authors present this workflow as a scalable approach to discovering such markers when samples are limited.
Caveats
The cross-sectional design compared mice of different ages rather than following changes within individual mice. The human associations do not show that the proteins caused frailty.
From the paper
- Animals
To improve statistical power, an additional 30 mice were included in the PEA analysis.
- Limitation
The cohort size was modest (n = 30 mice, 10 per age group), limiting statistical power and the generalizability of biological findings.
Quoted word for word from the full text on nature.com.
Comments
Be the first to comment.