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Updated: Mar 13, 2026
A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
Published on: May 16, 2015
Temporal Profile of Circulating microRNAs after Global Hypoxia-Ischemia in Newborn Piglets
Håvard Tetlie Garberg1, Marianne U Huun, Lars O Baumbusch
1Division of Pediatric and Adolescent Medicine, Department of Pediatric Research, Oslo University Hospital, Rikshospitalet, Norway.
Background:
There is a lack of reliable biomarkers that can identify and grade acute hypoxic-ischemic encephalopathy in newborns. MicroRNAs (miRNA) are short, non-coding strands of RNA that are released into the circulation in response to tissue stress and injury. Some miRNAs are highly tissue specific and thus may potentially be non-invasive biomarkers of neonatal hypoxic-ischemic brain injury.
Objective:
The aim of this study was to characterize the temporal expression of selected circulating miRNAs in a clinically relevant piglet model of neonatal hypoxia-ischemia (HI).
Methods:
A total of 13 anesthetized newborn piglets were randomized to either a control group (n = 5) or transient global HI group (n = 8). HI was achieved by ventilation with 8% oxygen until the point of severe acidosis (arterial base excess ≤-20 mmol/l) and/or hypotension (mean arterial blood pressure ≤20 mm Hg) was reached. Plasma was sampled at baseline, at the end of HI and 0.5, 3.5 and 9.5 h after HI. MiRNA expression was measured by qRT-PCR.
Results:
Compared to baseline, miR-374a increased during HI (p = 0.01), remained elevated at 0.5 h after HI (p = 0.02) and was downregulated at 9.5 h after HI (p = 0.02). MiR-210 increased during HI (p = 0.02) and rapidly normalized by 0.5 h after HI. MiR-124 and miR-125b did not exhibit significant alterations. Correlations were observed between miR-374a, arterial pH, base excess and lactate levels, and between miR-210 and pO2 (p < 0.05).
Conclusions:
Our data suggest that miR-374a and miR-210 are important regulators in neonatal HI and might have a place as biomarkers in this setting.
Insights
Circulating microRNAs (miRNAs) like miR-374a and miR-210 show promise as biomarkers for neonatal hypoxic-ischemic encephalopathy. These RNA molecules are released during brain injury and may help identify and grade the condition in newborns.
Area of Science:
- Biochemistry
- Molecular Biology
- Neonatal Medicine
Background:
- Acute hypoxic-ischemic encephalopathy (HIE) in newborns lacks reliable diagnostic biomarkers.
- MicroRNAs (miRNAs) are circulating RNA molecules released during tissue stress, potentially serving as non-invasive biomarkers.
- Neonatal HIE brain injury may be identifiable using specific tissue-specific circulating miRNAs.
Purpose of the Study:
- To characterize the temporal expression of selected circulating miRNAs in a piglet model of neonatal hypoxia-ischemia (HI).
- To investigate the potential of miRNAs as biomarkers for neonatal brain injury.
Main Methods:
- A piglet model of transient global hypoxia-ischemia (HI) was established.
- Plasma samples were collected at multiple time points before, during, and after HI.
- Quantitative reverse transcription polymerase chain reaction (qRT-PCR) was used to measure miRNA expression.
Main Results:
- Circulating miR-374a levels increased during and shortly after HI, then decreased.
- MiR-210 levels increased during HI and normalized quickly post-injury.
- Significant correlations were found between miR-374a and acidosis/lactate, and miR-210 and oxygen levels.
Conclusions:
- miR-374a and miR-210 are implicated as key regulators in neonatal HI.
- These miRNAs show potential as diagnostic biomarkers for neonatal hypoxic-ischemic encephalopathy.
- Further research may establish their role in clinical settings for identifying and grading neonatal brain injury.
