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Updated: Aug 23, 2025
Neurodevelopmental Reflex Testing in Neonatal Rat Pups
Published on: April 24, 2017
Early neurodevelopmental reflex impairments in a rodent model of cerebral palsy
Dini Ho1, Eduardo F Sanches1, Stephane V Sizonenko1
1Division of Child Development and Growth, Department of Pediatrics, School of Medicine, University of Geneva, Geneva, Switzerland.
Insights
This study introduces an experimental cerebral palsy (ECP) rodent model using maternal inflammation, anoxia, and sensorimotor restriction. Early neurological assessments in ECP rats reveal developmental delays, validating this model for CP research.
Area of Science:
- Neuroscience
- Developmental Biology
- Animal Models
Background:
- Cerebral palsy (CP) involves sensorimotor disabilities from developmental brain injury.
- Existing experimental models often fail to fully replicate the CP phenotype.
- Early neurological assessment is crucial for predicting impairments in developing brains.
Purpose of the Study:
- To develop and characterize an experimental cerebral palsy (ECP) rodent model.
- To assess early neurodevelopmental delays in ECP rats using neurological reflexes.
- To evaluate the utility of early neurological assessment in establishing the CP phenotype.
Main Methods:
- A rodent model was created using maternal inflammation (LPS), perinatal anoxia, and hindlimb sensorimotor restriction.
- Neurodevelopmental assessments, including reflexes and body weight, were conducted at specific postnatal days.
- Control groups received saline injections and standard rearing conditions.
Main Results:
- ECP rats exhibited impaired righting reflex and negative geotaxis.
- ECP rats showed enhanced performance in the home bedding test.
- Decreased body weight was observed in ECP animals from postnatal day 7 onwards.
Conclusions:
- The ECP model effectively mimics key aspects of CP-related developmental delays.
- Early neurological assessments provide valuable insights into the establishment of the CP phenotype.
- This model serves as a robust platform for investigating CP pathogenesis and therapeutic strategies.
Abstract:
Cerebral palsy (CP) causes sensorimotor disabilities due to injury to the developing brain. Experimental models do not always induce the CP phenotype completely. Early neurological assessment predicts future impairments and is valuable during development. Using a rodent model characterized by brain injury caused by maternal inflammation and perinatal anoxia, and sensorimotor restriction (experimental cerebral palsy [ECP]), we describe early neurodevelopmental delays by assessing reflexes in a stage corresponding to the brain development of term infants (Postnatal Day [P] 8 in rats). Pregnant Wistar rats were injected with lipopolysaccharide (LPS; 200 μg/kg) (n = 6) or saline (n = 4) on Embryonic Days 18/19. Following delivery, 87 male and female pups were used. At P0, injured animals were exposed to anoxia for 20'. From P2 to P21, ECP rats were subjected to hindlimb movement restriction for 16 h/day. ECP group had impaired righting reflex and negative geotaxis and, interestingly, performed home bedding test better than controls. From P7, ECP animals showed decreased body weight compared with controls. Overall, data provide evidence showing that this CP model based on the association of brain damage followed by sensorimotor restriction mimics CP delays and highlights the valuable information given by early neurological assessment during the establishment of the CP phenotype.
