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Updated: Nov 26, 2025
Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
Published on: November 20, 2015
Impact of prenatal lipopolysaccharide exposure on the development of rats
Marina G Silva1,2, Guilherme C Daros1,2, Gabriela M Santos2
1Programa de Pós-Graduação em Ciências da Saúde, Universidade do Sul de Santa Catarina, Laboratório de Neurociência Comportamental, Av. José Acácio Moreira, 787, Dehon, 88704-900 Tubarão, SC, Brazil.
Insights
Prenatal exposure to lipopolysaccharide (LPS) in rats can negatively impact offspring development. This maternal infection model reveals delays in physical maturation and altered neurodevelopmental reflexes in young rats.
Area of Science:
- Developmental neuroscience
- Reproductive toxicology
- Maternal-fetal health
Background:
- The intrauterine environment significantly influences offspring development, with both genetic and environmental factors playing crucial roles.
- Understanding maternal influences is essential for elucidating the pathophysiology of various diseases.
- Prenatal exposures can have lasting effects on structural and functional development.
Purpose of the Study:
- To investigate the impact of prenatal exposure to lipopolysaccharide (LPS) on the developmental trajectory of rat offspring.
- To assess the effects of maternal LPS administration on somatic development, physical maturation, and reflex ontogenesis.
- To establish a model for studying the consequences of maternal infection during critical developmental windows.
Main Methods:
- Pregnant rats were administered lipopolysaccharide (LPS) or saline intraperitoneally on day 9.5 of gestation.
- Offspring were evaluated for indicators of brain and somatic development.
- Physical maturation and reflex ontogenesis (including auditory pavilion opening, negative geotaxis, and grasp reflex) were assessed.
Main Results:
- Prenatal LPS exposure resulted in delayed opening of the auditory pavilion in offspring.
- Significant reductions were observed in tail length, body length, cranial axes, and overall body weight.
- Impaired reflex ontogenesis indicated disruptions in neurodevelopmental maturation.
Conclusions:
- Maternal infections during pregnancy, modeled by LPS exposure, can disrupt the intrauterine environment.
- These disruptions impair both functional and structural aspects of the central nervous system in developing offspring.
- Prenatal exposure negatively affects the maturation of physical characteristics and neurodevelopmental milestones.
Abstract:
The intrauterine environment is infl uenced by several factors, genetic or environmental, which are essential in understanding the pathophysiological mechanisms of some diseases. In this study, the aim was to investigate the impact of prenatal lipopolysaccharide exposure on the development of rats. Fifty pregnant rats received intraperitoneal administration of lipopolysaccharide (100 µg/kg), or saline at the same dose, on the 9.5th day of pregnancy. The offspring of these rats were analyzed for indicators of brain and somatic development and maturation of physical characteristics. Refl ex ontogenesis was also analyzed by vibrissae placement, negative geotaxis, palmar grasp, precipice aversion, decubitus recovery and acceleration reaction. Administration of lipopolysaccharide on the 9.5th gestational day caused delayed opening of the auditory pavilion, reduction in the length of the tail, body, cranial axes, and body weight. Thus, maternal infections can interfere in the intrauterine environment, impairing functional and structural aspects of the central nervous system, as well as the maturation of physical characteristics.
