Mesenchymal Stem Cell-Derived Exosomes Improve Functional Recovery in Rats After Traumatic Brain Injury: A Dose-Response and Therapeutic Window Study.
Yanlu Zhang, Yi Zhang, Michael Chopp and 3 others
PMID 32462980WHAT IT FOUND
In rats with brain injury, exosomes from human stem cells improved maze and movement scores, especially 100 micrograms given 1 day after injury.
This is animal evidence only, not a treatment tested in people.
Key findings
01In rats with brain injury, exosome treatment improved maze learning compared with PBS controls.
02The 100 microgram dose improved neurological severity and footfault scores more than the 50 microgram dose.
03Exosome treatment reduced a marker of inflammation, but lesion volume did not change.
STILL TO COME
How it was doneWhat they found
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What it does not show
This was an animal study, not a human trial. Each group had 8 rats, a small number. The exosomes came from human mesenchymal stem cells but were given to rats. The authors say the cell-counting method was suboptimal and not absolute. Exosome treatment did not change lesion volume. The paper reports no human patient outcomes or rehabilitation delivery.
Declared interests
The authors declare no potential conflicts of interest. The article is listed as supported by NIH extramural research.
The easy way to misread this
Do not read this as evidence that exosomes are a proven treatment for people with TBI or something therapists can use. The study was done in rats with small groups, and it did not test human rehabilitation outcomes.