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Prenatal malnutrition effect on pyramidal and granule cell generation in the hippocampal formation
W A Debassio1, T L Kemper, J R Galler
1Department of Pediatrics, Boston University School of Medicine, MA 02118.
Insights
Prenatal protein malnutrition selectively impairs granule cell neurogenesis in the rat hippocampus, particularly when induced late in gestation. Pyramidal cell development remained unaffected, suggesting specific vulnerabilities.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Prenatal malnutrition can impact brain development.
- The hippocampal formation is crucial for learning and memory.
- Neurogenesis, the birth of new neurons, occurs during specific developmental windows.
Purpose of the Study:
- To investigate the effects of prenatal protein malnutrition on hippocampal neurogenesis in rats.
- To determine if malnutrition differentially affects granule and pyramidal cell generation.
- To identify critical developmental periods for malnutrition-induced neurogenesis deficits.
Main Methods:
- Pregnant rats were fed a protein-deficient diet.
- Tritiated thymidine was injected on embryonic days E12, E16, or E20 to label dividing cells.
- Offspring were sacrificed on postnatal day P30 for analysis of hippocampal cell populations.
Main Results:
- Prenatal protein malnutrition significantly decreased granule cell neurogenesis when induced on E20.
- No significant effect on granule cell neurogenesis was observed for injections on E12 or E16.
- The generation of pyramidal cells was not affected by prenatal malnutrition at any of the tested time points.
Conclusions:
- Prenatal protein malnutrition has a differential impact on hippocampal neuronal development.
- Late gestational protein deprivation specifically impairs rat granule cell neurogenesis.
- These findings highlight the vulnerability of specific neuronal populations to nutritional insults during critical developmental periods.
Abstract:
The effects of prenatal malnutrition produced by protein deprivation on the neurogenesis of granule and pyramidal cells in the rat hippocampal formation was investigated by injecting pregnant rats with tritiated thymidine on E12, E16, or E20 and sacrificing the pups on P30. Granule cell neurogenesis was significantly decreased in the pups injected on E20, but not in E12 or E16 groups. There was no effect on the generation of pyramidal cells at the times noted, indicating a differential effect of prenatal malnutrition on the generation of these two different neuronal types in the hippocampal formation.