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Modeling Neonatal Intraventricular Hemorrhage Through Intraventricular Injection of Hemoglobin

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Published on: August 25, 2022

Developmental stage-dependent transcriptomic responses to neonatal intraventricular hemorrhage.

Elizabeth Wallace-Anthony^1,2, Miriam Zamorano^3,4, Hemendra J Vekaria³

¹Bioinformatics Core, Department of Neuroscience, Medical University of South Carolina, Charleston, SC, 29425, USA.

Journal of Neuroinflammation

|November 29, 2025

Summary

Neonatal intraventricular hemorrhage (IVH) response varies by brain development stage. Later-stage preterm brains show a stronger inflammatory reaction to IVH, indicating critical developmental timing for neuroimmune responses.

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Area of Science:

Neuroscience
Developmental Biology
Immunology

Background:

Neonatal intraventricular hemorrhage (IVH) is a significant complication in preterm infants.
The influence of developmental stage on the brain's response to IVH is not well understood.

Purpose of the Study:

To investigate how different developmental stages affect the brain's transcriptional response to IVH.
To identify cell-type-specific changes following IVH at distinct postnatal ages.

Main Methods:

Single-nucleus RNA sequencing was performed on rat brains 24 hours after induced IVH.
IVH was induced at postnatal day 2 (PND2) and postnatal day 5 (PND5).
Transcriptional responses were analyzed across 42 identified cell populations.

Main Results:

Brains at PND5 displayed a significantly stronger immune and inflammatory response to IVH compared to PND2.
Microglia showed increased oxidative stress and mixed pro-/anti-inflammatory polarization at PND5.
Signaling pathways shifted from reparative (IGF2, TGF-β) at PND2 to proinflammatory (Wnt, Runx1, Stat5) at PND5.

Conclusions:

Developmental timing critically shapes the neuroimmune response to neonatal intraventricular hemorrhage.
Distinct signaling pathways and cellular responses are observed at different postnatal ages post-IVH.
Findings suggest potential stage-specific therapeutic targets for IVH treatment.