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Comparative effects of prenatal and postnatal undernutrition on learning and memory in rats
A K Jaiswal1, S N Upadhyay, K S Satyan
1Department of Pharmacology, Banaras Hindu University, Varanasi, India.
Insights
Both prenatal and postnatal undernutrition in rats significantly impair learning and memory. These nutritional deficits negatively affect discrimination learning and long-term memory retention in offspring.
Area of Science:
- Neuroscience
- Developmental Biology
- Nutritional Science
Background:
- Undernutrition during critical developmental periods can have lasting effects on brain function.
- Understanding the impact of prenatal and postnatal nutrition is crucial for cognitive development.
Purpose of the Study:
- To investigate the effects of prenatal and postnatal undernutrition on learning and memory in albino rats.
- To assess the impact of nutritional deficits on various learning and memory parameters.
Main Methods:
- Prenatal undernutrition induced by maternal dietary restriction (50% during gestation).
- Postnatal undernutrition induced by alternating maternal care (12 hr daily) during suckling.
- Assessment of learning and memory using discrimination learning, passive avoidance, and active avoidance tests at 2.5-3 months of age.
Main Results:
- Significant deficits observed in original and reversal discrimination learning in undernourished rats.
- Impaired retention of passive avoidance after a one-week interval and active avoidance learning.
- No significant effect on the acquisition of active avoidance or 24-hour passive avoidance retention.
Conclusions:
- Both prenatal and postnatal undernutrition lead to significant cognitive impairments in learning and memory.
- The timing and duration of nutritional deficits influence specific aspects of learning and memory retention.
Abstract:
Effects of pre- and post-natal undernutrition on learning and memory parameters were studied in albino rats. Prenatal undernutrition was induced in rat pups by restricting the mother's diet by 50% during the entire gestation period, whereas postnatal undernutrition was induced in rat pups by restriction of their diet by rotating them between lactating and non-lactating maternalised females for 12 hr each day during suckling period from 2nd day to 18th day after birth. At 2.5 to 3 months of age all the rat offsprings were subjected to (i) original and reversal discrimination learning, (ii) passive avoidance, and (iii) active avoidance and its retention tests. The results indicate that both pre- and post-natal undernutrition in rat pups caused significant deficits in original and reversal discrimination learning, retention of passive avoidance after one week retention interval, and retention of active of avoidance learning. However, both pre- and post-natal undernutrition did not show significant effect on acquisition of active avoidance and retention of passive avoidance after 24 hr retention interval.