# WHITE MATTER MATTERS: New Approach to the Brain’s Hidden Half Using Circulating Oligodendrocyte-Derived Extracellular Vesicles

## TL;DR

A new blood test using brain-derived vesicles can detect white matter changes, offering early insights into brain health.

## Contribution

A novel blood test based on oligodendrocyte-derived extracellular vesicles for assessing white matter integrity.

## Key findings

- ODE levels remain stable after mild head impacts but change significantly after neurological insults.
- The test shows potential for early diagnosis and monitoring of brain health conditions.
- ODE levels vary among individuals, indicating potential for personalized assessment.

## Abstract

What is the main finding?

Using circulating oligodendrocyte-derived extracellular vesicles, we developed a novel blood test to assess the white matter integrity of the human brain.

What is the implication of the main finding?

Preliminary clinical studies indicated that this test is applicable to a range of conditions in which brain health is a major concern.

White matter, comprising 60% of the human brain, is formed by axonal fibers supported by oligodendrocytes. It is essential for brain communication, yet damage can accumulate silently leading to severe neurological problems. Current diagnostics detect changes only after symptoms appear. To enable earlier detection damage, we developed a blood test monitoring changes in oligodendrocyte-derived extracellular vesicles (ODEs) released from the brain into circulation. After validating the assay, we have shown that ODE levels vary from different individuals. However, ODE levels remain stable under mild head impacts in soccer heading practice (n = 15) and boxing/mixed martial arts (n = 10), whereas change markedly following neurological insults such as hemorrhagic (n = 7) and ischemic stroke (n = 14), or gynecological cancer after chemotherapy (n = 11). ODE measurement can potentially provide a minimally invasive window into white matter health and support early diagnosis, personalized assessment, and new insights into human brain biology.