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Updated: Dec 27, 2025
A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
Published on: May 16, 2015
Activation of PGC-1α and Mitochondrial Biogenesis Protects Against Prenatal Hypoxic-ischemic Brain Injury
Lijie Jia1, Jianwei Wang1, Huimin Cao1
1Department of Anesthesiology, the International Peace Maternity and Child Health Hospital, Shanghai Jiaotong University School of Medicine, 910 Hengshan Road, Shanghai 200030, China; Shanghai Key Laboratory of Embryo Original Diseases, 910 Hengshan Road, Shanghai 200030, China.
Insights
Prenatal hypoxia-ischemia (HI) damages the immature brain, but the PGC-1α pathway activates mitochondrial biogenesis as a protective response. Pioglitazone enhances this mechanism, reducing hippocampal injury and improving cognitive function after HI.
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Developmental Biology
Background:
- Prenatal hypoxia-ischemia (HI) leads to persistent cognitive deficits in survivors.
- HI causes mitochondrial damage, which can be counteracted by mitochondrial biogenesis.
- Peroxisome proliferator-activated receptor γ co-activator 1α (PGC-1α) is a key regulator of mitochondrial biogenesis.
Purpose of the Study:
- To investigate the role of PGC-1α and mitochondrial biogenesis in the immature brain's response to prenatal HI.
- To determine if promoting PGC-1α activity can offer neuroprotection against HI-induced brain injury.
Main Methods:
- Utilized a pregnant rat model for intrauterine HI induction and SH-SY5Y cells for in vitro studies.
- Assessed PGC-1α, NRF-1, TFAM, and COX-IV expression via Western blot, qPCR, and immunohistochemistry.
- Evaluated mitochondrial density/morphology using transmission electron microscopy and assessed hippocampal injury and cognitive function.
Main Results:
- Intrauterine HI activated the PGC-1α-NRF-1-TFAM pathway at both protein and mRNA levels.
- HI induced both mitochondrial damage and compensatory mitochondrial biogenesis, evidenced by increased COX-IV expression.
- Postnatal pioglitazone treatment amplified PGC-1α and mitochondrial biogenesis, mitigating hippocampal injury and enhancing cognitive performance.
Conclusions:
- Activation of PGC-1α and mitochondrial biogenesis represents a neuroprotective mechanism against prenatal HI brain injury.
- Enhancing PGC-1α activity with pioglitazone shows potential as a therapeutic strategy for treating HI-induced hippocampal injury and cognitive defects.
Abstract:
Survivals after prenatal hypoxia-ischemia (HI) usually suffer long-lasting cognitive defects. Reduced blood-oxygen supplies and the following reperfusion cause mitochondrial injury. Damaged mitochondria could be replaced by mitochondrial biogenesis program and peroxisome proliferator-activated receptor γ co-activator 1α (PGC-1α) is the specific up-regulator. The objective of this study was to determine whether PGC-1α and mitochondrial biogenesis participate in the resistant responses of an immature brain to prenatal HI. We used a pregnant rat model of transient occlusion of uterine perfusion to induce intrauterine HI associated brain injury. SH-SY5Y cells exposed to oxygen-glucose deprivation was used to investigate the HI induced reactions in vitro. PGC-1α and its downstream signaling pathway (NRF-1 and TFAM) were examined by Western blot and quantitative Real-time PCR. Mitochondrial respiratory enzyme COX-IV was investigated by Western blot and immunohistochemistry. Mitochondrial density and morphology was detected by transmission electron microscopy. The hippocampal injury and cognitive function were examined. We found that the intrauterine HI triggered PGC-1α-NRF-1-TFAM pathway in both protein and mRNA levels. COX-IV expression significantly increased after HI injury. Intrauterine HI induced both mitochondrial impairment and mitochondrial biogenesis. Postnatal administration of pioglitazone further promoted PGC-1α and mitochondrial biogenesis, alleviated hippocampal injury, and improved performance in the behavioral tasks after intrauterine HI. Our investigation implicated activation of PGC-1α, and mitochondrial biogenesis is a neuroprotective mechanism against brain injury caused by systemic prenatal HI. Promotion of PGC-1α by pioglitazone might be a potential treatment for protecting against hippocampal injury and cognitive defects after intrauterine HI.
