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Updated: Aug 20, 2025
Neurodevelopmental Reflex Testing in Neonatal Rat Pups
Published on: April 24, 2017
Delayed Formation of Neonatal Reflexes and of Locomotor Skills Is Associated with Poor Maternal Behavior in OXYS Rats
Tatiana Kozlova1, Ekaterina Rudnitskaya1, Alena Burnyasheva1
1Institute of Cytology and Genetics, Siberian Branch of Russian Academy of Sciences (ICG SB RAS), 10 Akad. Lavrentyeva Ave., 630090 Novosibirsk, Russia.
Insights
Poor maternal care in OXYS rats, which are prone to Alzheimer's disease-like pathology, delays pup development and causes behavioral issues. These early-life effects may contribute to later-life neurodegeneration.
Area of Science:
- Neuroscience
- Developmental Biology
- Gerontology
Background:
- Postnatal brain development is highly plastic, with critical periods influencing long-term outcomes.
- Maternal care quality significantly impacts offspring development and can have lasting consequences.
- Senescence-accelerated OXYS rats exhibit an Alzheimer's disease-like pathology.
Purpose of the Study:
- To investigate the impact of maternal behavior in OXYS rats on offspring development.
- To compare maternal care and offspring development between OXYS and Wistar rats.
- To explore the link between early-life events and later-life neurodegeneration.
Main Methods:
- Comparative analysis of maternal behavior between OXYS and Wistar rats.
- Assessment of physical development milestones in OXYS and Wistar rat pups.
- Evaluation of behavioral development, including reflexes, motor skills, and depression-like behaviors.
Main Results:
- OXYS rats displayed more passive maternal behavior and provided insufficient care compared to Wistar rats.
- OXYS pups showed delayed physical development (e.g., auricle detachment, eye opening) and delayed manifestation of reflexes and locomotor skills.
- Behavioral abnormalities in OXYS pups included poor coordination, decreased motivation, and depression-like behaviors.
Conclusions:
- Poor maternal care in OXYS rats adversely affects offspring physical and behavioral development.
- These early-life deficits may be linked to the predisposition to Alzheimer's disease-like pathology in OXYS rats.
- Early-life interventions could be crucial for mitigating long-term neurodevelopmental consequences.
Abstract:
Postnatal brain development is characterized by high plasticity with critical windows of opportunity where any intervention may positively or adversely influence postnatal growth and lead to long-lasting consequences later in life. Poor maternal care is among these interventions. Here, we found that senescence-accelerated OXYS rats prone to an Alzheimer's disease-like pathology are characterized by more passive maternal behavior and insufficient care for pups as compared to control (Wistar) rats. OXYS pups demonstrated a delay in physical development (of auricle detachment, of emergence of pelage and incisors, of eye opening, and of vaginal opening in females) and late manifestation of reflexes and locomotor skills. All observed behavioral abnormalities are connected either with poor coordination of limbs' movements or with a decrease in motivation and development of depression-like behavior. It is possible that their manifestations can be promoted by the features of maternal behavior of OXYS rats. Overall, these early-life events may have long-lasting consequences and contribute to neurodegeneration and development of the Alzheimer's disease-like pathology later in life.
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