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Effects of early postnatal undernutrition on brainstem auditory evoked potentials in weanling rats
S Kawai1, H Nakamura, T Matsuo
1Department of Pediatrics, Kobe University, School of Medicine, Japan.
Insights
Early postnatal undernutrition in rats transiently delays brainstem auditory evoked potentials (BAEPs) development. Nutritional rehabilitation allowed undernourished rats to catch up on BAEPs development by 33 days of age.
Area of Science:
- Neuroscience
- Developmental Biology
- Auditory Neuroscience
Background:
- Early life nutrition significantly impacts neurodevelopment.
- Brainstem auditory evoked potentials (BAEPs) are crucial indicators of auditory pathway maturation.
Purpose of the Study:
- To investigate the transient effects of early postnatal undernutrition on rat BAEP development.
- To assess the efficacy of nutritional rehabilitation in recovering BAEPs.
Main Methods:
- Rats were subjected to intermittent undernutrition during the weanling period (days 1-10 or 1-14).
- Nutritional rehabilitation was provided post-undernutrition period.
- BAEPs were recorded at various ages (14, 18, 22, and 33 days).
- Control group received adequate nutrition throughout.
Main Results:
- Early undernutrition delayed BAEP wave IV detection and prolonged latencies (wave IV, I-IV IPL) at 14-18 days.
- The severity of delay correlated with the duration of undernutrition.
- By 33 days, no significant differences in BAEP latencies were observed between undernourished and control groups.
Conclusions:
- Early postnatal undernutrition causes a transient delay in rat BAEP development.
- Nutritional rehabilitation effectively reverses these delays, enabling developmental catch-up.
Abstract:
The effect of early postnatal undernutrition on the development of brainstem auditory evoked potentials (BAEPs) was examined using rats during the weanling period. Undernutrition was achieved by separating the suckling rats from the mother for 24 h every other day from 1 day through 10 days of age (group 1) or from 1 day through 14 days of age (group 2). Both groups were rehabilitated nutritionally after these periods. The littermates which were not separated from the mother were used as well-fed control. At 14 days of age, wave IV of BAEPs was detected in 44% of group 1 and in 69% of group 2, where it was detected in all control rats. Peak latency of wave IV and I-IV interpeak latency (IPL) of group 2 rats were significantly longer than those in control rats from 14 through 22 days of age. Similarly, those of group 1 rats were significantly longer than those in control rats at 14 and 18 days of age. At 33 days of age, there were no significant differences in terms of peak latencies (waves I, III and IV) and IPLs (I-III and I-IV) between both the undernourished groups and the control group. These results indicate that early postnatal undernutrition delays the development of BAEPs in rats transiently, and nutritional rehabilitation can make the group 'catch up' on BAEPs.