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Updated: Apr 18, 2026
Early Pathological and Magnetic Resonance Detection of Cerebral Injury Using a Rat Model of Neonatal Hypoxic Ischemic Encephalopathy
Published on: October 28, 2022
Impact of inhaled nitric oxide on white matter damage in growth-restricted neonatal rats
Hoa Pham1, An Phan Duy1, Julien Pansiot1
11] INSERM UMR1141, Université Paris Diderot, Paris, France [2] PremUP Foundation, Paris, France.
Insights
Inhaled nitric oxide (iNO) therapy in neonatal rats with intrauterine growth restriction (IUGR) reduced brain damage, improved myelination, and enhanced learning abilities, offering neuroprotection.
Area of Science:
- Neuroscience
- Developmental Biology
- Neonatal Medicine
Background:
- Fetal growth restriction (FGR) causes significant perinatal morbidity and mortality.
- Intrauterine growth retardation (IUGR) is linked to neurocognitive and neuropsychiatric impairments in neonates due to brain injury.
- Nitric oxide (NO) shows promise for neuroprotection in preclinical models.
Purpose of the Study:
- To investigate the neuroprotective effects of inhaled nitric oxide (iNO) in a rat model of IUGR-induced brain injury.
- To assess iNO's impact on neuroinflammation, myelination, and cognitive function in IUGR neonates.
Main Methods:
- IUGR was induced by protracted gestational hypoxia in a neonatal rat model.
- Neonatal rats received low-dose, long-lasting inhaled NO (iNO) exposure.
- Neuroprotection was evaluated using immunohistochemistry, quantitative PCR, and cognitive assessments.
Main Results:
- IUGR was associated with neuroinflammation and delayed myelination.
- iNO treatment reduced cell death and microglial activation.
- iNO enhanced oligodendroglial proliferation, improved myelination, and upregulated P27kip1, promoting oligodendrocytic differentiation.
- iNO counteracted hypoxia-induced deficits in learning abilities.
Conclusions:
- Inhaled NO (iNO) demonstrates significant neuroprotective potential in a model of IUGR-induced brain injury.
- iNO may be effective in preventing brain damage and promoting repair in the developing brain.
- This study supports further investigation of iNO for neonatal brain protection.
Background:
Fetal growth restriction is the second leading cause of perinatal morbidity and mortality, and neonates with intrauterine growth retardation (IUGR) have increased neurocognitive and neuropsychiatric morbidity. These neurocognitive impairments are mainly related to injury of the developing brain associated with IUGR. Growing evidence from preclinical models of brain injury in both adult and neonatal rodents supports the view that nitric oxide can promote neuroprotection.
Methods:
In a model of IUGR induced by protracted gestational hypoxia leading to diffuse white matter injury, we subjected neonatal rats to low dose (5 ppm) but long-lasting (7 d) exposure to inhaled NO (iNO). We used a combination of techniques, including immunohistochemistry, quantitative PCR, and cognitive assessment, to assess neuroprotection.
Results:
Antenatal hypoxia-induced IUGR was associated with severe neuroinflammation and delayed myelination. iNO exposure during the first postnatal week significantly attenuated cell death and microglial activation, enhanced oligodendroglial proliferation and finally improved myelination. Remarkably, iNO was associated with the specific upregulation of P27kip1, which initiates oligodendrocytic differentiation. Finally, iNO counteracted the deleterious effects of hypoxia on learning abilities.
Conclusion:
This study provides new evidence that iNO could be effective in preventing brain damage and/or enhancing repair of the developing brain.
