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Published on: March 23, 2011
Effect of protein malnutrition on CA3 hippocampal pyramidal cells in rats of three ages
M García-Ruiz1, S Díaz-Cintra, L Cintra
1Departamento de Fisiología, UNAM, Ciudad Universitaria, México, DF.
Insights
Prenatal protein restriction impairs hippocampal CA3 neuron development, reducing dendritic branching and spine density across all ages studied. Malnutrition disrupted normal age-related brain changes in rats.
Area of Science:
- Neuroscience
- Developmental Biology
- Nutritional Science
Background:
- Prenatal and postnatal nutrition significantly impacts brain development.
- Hippocampal CA3 pyramidal cells are crucial for learning and memory.
- Protein deprivation is a common form of malnutrition with potential neurological consequences.
Purpose of the Study:
- To investigate the long-term effects of prenatal and postnatal protein deprivation on CA3-hippocampal pyramidal cells in rats.
- To analyze structural changes in these neurons at different developmental stages (30, 90, and 220 days).
Main Methods:
- Rats were fed either a 6% (protein-deprived) or 25% (control) casein diet before and after conception.
- 216 CA3 pyramidal cells were analyzed using rapid Golgi impregnation.
- Measurements included somal size, dendritic dimensions, dendritic branching, thorny excrescence, and synaptic spine density.
Main Results:
- Protein deprivation caused significant reductions in somal size (at 220 days), apical dendrite diameter (at 30 and 90 days), and synaptic spine density and head diameter (at all ages).
- Thorny excrescence area was reduced at 220 days.
- Dendritic branching was decreased in areas receiving perforant pathway input (at 220 days) but increased in areas receiving Schaffer collateral input (at 30 days).
Conclusions:
- Prenatal and postnatal protein deprivation leads to lasting structural deficits in CA3-hippocampal pyramidal cells.
- Malnutrition disrupts normal age-related maturation of these neurons.
- The observed deficits in synaptic spine density and dendritic branching align with known synaptic connections, suggesting specific pathway impairments.
Abstract:
Prenatal and postnatal protein deprivation effects on CA3-hippocampal pyramidal cells were investigated in 30-, 90- and 220-day-old rats. Female rats were fed either a 6% or a 25% casein diet 5 wk before conception and the litters were maintained on their respective diet until sacrificed. In 216 rapid Golgi-impregnated cells, we measured somal size, length and diameter of apical dendrite, number of apical dendrites intersecting 10 concentric rings 38 microns apart, thorny excrescence area and length, head diameter and density of synaptic spines on 50-microns segments of apical dendrite. The present experiments showed that malnutrition produced significant reductions of somal size in animals at 220 days of age. There were significant reductions of apical dendrite diameters in animals of 30 and 90 days, and of density and head diameter of synaptic spines at the three ages studied, and significant decrease of the thorny excrescence area at 220 days of age. At this latter age, dendritic branching was significantly decreased in the last four rings representing the area into which the perforant pathway projects. In 30-day malnourished rats, dendritic branching showed a significant increase in rings 4-6 representing the area in which the Schaffer collaterals synapse. The location of the deficit in dendritic spines corresponds to the sites where mossy fibers synapse on the apical dendrites of CA3 neurons. Age-related changes normally observed in control rats (e.g., the 30-day-old control group showed the smallest somal size and 220-day-old controls the largest size) failed to occur in the malnourished rats. The deficits in spine density and dendritic branching (in animals of 220 days old) were similar to those found in our previous studies on fascia dentata.
