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Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
Published on: November 20, 2015
Combined Maternal Immune Activation and Prenatal Intermittent Hypoxic Stress Lead to Developmental Motor Deficits in
Prosper Iwhiwhu1, Benneth Ben-Azu2, Bienose S Chijioke1
1DELSU Joint Canada-Israel Neuroscience and Biopsychiatry Laboratory, Department of Pharmacology, Faculty of Allied Health Sciences, College of Health Sciences, Delta State University, Abraka, Delta State, Nigeria.
Insights
This study shows that combined prenatal inflammation and hypoxia in rats cause sex-specific neurodevelopmental deficits, with males exhibiting more severe cerebral palsy-like outcomes due to combined oxidative, inflammatory, and hypoxic stress.
Area of Science:
- Neuroscience
- Developmental Biology
- Pathophysiology
Background:
- Cerebral palsy (CP) involves motor and cognitive impairments, with inflammation and hypoxia as key contributors.
- The synergistic effects of prenatal inflammation and perinatal hypoxic stress on brain development are not fully understood.
- Animal models are crucial for investigating CP's complex etiological factors.
Purpose of the Study:
- To investigate the pathophysiological mechanisms of combined maternal immune activation and intermittent hypoxic stress (IHS) in a rat model.
- To mimic clinical conditions of CP and analyze sex- and region-dependent neurodevelopmental deficits.
- To elucidate the interplay between inflammation, hypoxia, and oxidative stress in CP pathogenesis.
Main Methods:
- Pregnant rats were exposed to lipopolysaccharide (LPS) and intermittent hypoxic stress (IHS).
- Offspring were assessed behaviorally and biochemically for oxidative stress, neuroinflammation, neurotrophic factors, cholinergic function, and HIF-1α.
- Analyses were conducted in the prefrontal cortex, striatum, and cerebellum.
Main Results:
- Male offspring showed severe impairments: elevated TNF-α, nitrite, malondialdehyde; reduced cholinergic function, IL-4, and antioxidant enzymes.
- Females exhibited delayed, region-specific impairments with better antioxidant capacity.
- Both sexes had altered BDNF levels and depleted dopamine; HIF-1α revealed interactive signaling.
Conclusions:
- The dual-hit model effectively induced sex- and region-dependent neurodevelopmental deficits resembling CP.
- Males are more susceptible to CP-like outcomes through converging oxidative, inflammatory, and hypoxic mechanisms.
- This model provides insights into CP's complex etiology and potential sex-based therapeutic targets.
Abstract:
Cerebral palsy (CP) is a prevalent neurodevelopmental disorder associated with motor and cognitive impairments. Inflammation and hypoxia are key contributors to CP pathogenesis, often acting synergistically to disrupt brain development. However, an understanding of the interplay between prenatal inflammation and perinatal brain hypoxic stress in animal models of the disease remains unclear. Hence, we designed an experimental approach to investigate the pathophysiological mechanisms of combined maternal immune activation and intermittent hypoxic stress (IHS) in rats, aiming to mimic the clinical conditions of CP. Pregnant rats received lipopolysaccharide (0.1 mg/kg, i.p.) on gestational day 15 and were exposed to IHS (10 min, twice daily) from day 17 to delivery. Offspring were divided into four groups: saline control, LPS, IHS, and LPS + IHS. Behavioral assessments across infancy, adolescence, and adulthood consisted of open-field, negative geotaxis, grip strength, beam walk, and pole tests. Biochemical mechanisms of oxidative/nitrergic stress, neuroinflammation, neurotrophic factors, cholinergic function, and hypoxia-inducible factor 1-alpha (HIF-1α) were analyzed in the prefrontal cortex, striatum, and cerebellum. Male offspring exhibit severe impairments, including elevated TNF-α, nitrite, lipid peroxidation indicated by increased malondialdehyde, reduced cholinergic system, and suppressed IL-4 and antioxidant enzymes. Females showed delayed region-specific impairments, with relative preservation of antioxidant capacity. Both offspring show altered BDNF levels, showing reductions in the PFC and STR as well as in the cerebellum, while dopamine was depleted in the STR and CER across both sexes. HIF-1α expression revealed interactive hypoxic-inflammatory signaling. Overall, the dual-hit model induced sex- and region-dependent neurodevelopmental deficits, with males more prone to CP-like outcomes via converging oxidative, inflammatory, and hypoxic mechanisms.
