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Area of Science:

Neuroscience
Genetics
Biochemistry

Background:

Circulating microRNAs (miRNAs) show promise as minimally invasive Alzheimer's disease (AD) biomarkers.
Previous research identified potential plasma miRNA biomarkers in humans.
Systematic validation in AD animal models was lacking.

Purpose of the Study:

To validate selected plasma miRNA candidates in a triple-transgenic (3xTg-AD) mouse model of Alzheimer's disease.
To compare miRNA levels in 3xTg-AD mice with non-transgenic (NTg) controls.
To assess the utility of miRNAs as biomarkers for AD pathogenesis.

Main Methods:

Plasma miRNA levels were measured using real-time quantitative PCR (RT-qPCR).
The study analyzed 16-20-month-old NTg and 3xTg-AD mice (n=17 per group).
Endogenous miR-192-5p was used as a normalizer, and spike-in miR-39-3p as an exogenous control.

Main Results:

Significant differences in plasma miRNA levels were observed between 3xTg-AD and NTg mice.
The observed miRNA alterations in the mouse model mirrored those found in human AD samples.
miR-192-5p was identified as a stable endogenous normalizer.

Conclusions:

The 3xTg-AD mouse model displays a plasma miRNA profile consistent with the human AD molecular signature.
These findings support the potential of miRNAs as reliable Alzheimer's disease biomarkers.
The 3xTg-AD model serves as a valuable platform for investigating miRNA roles in AD pathogenesis.