Nature Neuroscience · 11 August 2026 · From issue 22
In lab-grown human fetal brain tissue, an immune signal sped up brain growth and caused early folding.
Muhammad Z. K. Assir, Mario Yanakiev et al., Modeling maternal immune activation in 3D ex vivo human fetal brain cerebroids reveals IL-17A-driven disruption of cortical development, Nature Neuroscience.
A lab-made 3D model of real human fetal brain tissue lets scientists study how infections during pregnancy affect brain growth. A signal called IL-17A, made by the immune system during infections, caused the tissue to fold too early. It also grew thicker and made brain cells too fast. This signal switched on a stress pathway inside brain stem cells, and a drug blocking that pathway reversed the changes.
Shows a possible cause and a possible fix, both tested only in lab tissue, not in pregnancy.
Lab-grown tissue only, no living pregnancies tested yet.
Integrity screen: passed (3 checks) Checked 17 August 2026. Retraction record: none. DOI resolves at doi.org. Metadata record found (Nature Neuroscience). Read the source
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