Why do preterm brains lose specific interneurons?
Human preterm prefrontal cortex had fewer upper-layer SST and calbindin interneurons; a mouse combo of late maternal LPS plus postnatal hypoxia, but not either insult alone, reproduced that loss with later behavioral deficits.
Source
Impaired Interneuron Development in a Novel Model of Neonatal Brain Injury
Study at a glance
- Design
- Animal / in-vitro — Human preterm vs term BA9 immunohistochemistry plus a 2×2 mouse model of late LPS MIA and postnatal chronic sublethal hypoxia
- N
- N=27 · 13 term and 14 preterm human BA9 donors; GAD65-GFP mice, both sexes, four MIA×CSH groups from ≥2 litters each
- Population
- NIH NeuroBioBank term/preterm infant PFC plus C57BL/6 GAD65-GFP mouse offspring of both sexes
- Outcome
- PFC interneuron subtype density (SST, CLB, others), postnatal microglia, and later neurobehavior
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Inspect source passages
Why do preterm brains lose specific interneurons?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
13 term and 14 preterm infant BA9 sections.
BA9 sections from 13 term and 14 preterm infants were obtained.
LPS 150 µg/kg at E15.5 and E16.5; 10.9% O2 from P3–P10.
Mild, late MIA was induced using 150 µg/kg of lipopolysaccharide (LPS; L6529, from Escherichia coli O55:B5, Millipore Sigma), administered to the pregnant dam intraperitoneally on both E15.5 and E16.5.
What they did
Immunostained BA9 from 13 term and 14 preterm infants, then built a mouse model: 150 µg/kg LPS to dams at E15.5 and E16.5 plus 10.9% oxygen from P3–P10, with four MIA×CSH groups assessed anatomically and behaviorally.
What they found
Upper-layer SST and CLB interneurons were reduced in preterm human PFC. The same pattern appeared in mouse PFC only after MIA+CSH, linked to postnatal microglial activation during hypoxia only after MIA, plus long-term neurobehavioral deficits.
The limits
What it doesn't show
Postmortem infant samples and a mouse double-hit model cannot prove that targeting SST cells would prevent autism or schizophrenia after preterm birth.
Key terms
- MIA
- Maternal immune activation; here late LPS (150 µg/kg i.p. at E15.5 and E16.5) modeling chorioamnionitis.
- CSH
- Chronic sublethal hypoxia: 10.9% oxygen from P3 to P10.
- SST / CLB
- Somatostatin and calbindin interneuron markers reduced in upper cortical layers.
- BA9
- Prefrontal Brodmann area 9 examined in human specimens.
- Chorioamnionitis
- Intrauterine infection/inflammation associated with ~85% of extremely preterm births.
- GAD65-GFP
- Transgenic reporter line used to label GABAergic interneurons.
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Human BA9 samples numbered:
Common questions
How many human infant brains?
13 term and 14 preterm BA9 specimens.
Did MIA or hypoxia alone mimic the human pattern?
No—only the combination did.
How was MIA induced?
150 µg/kg LPS to the dam on E15.5 and E16.5.
What oxygen level modeled respiratory failure?
10.9% oxygen from P3 to P10.
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