NADPH-Diaphorase Containing Neurons and Biocytin-labelled Axon Terminals in the Visual Cortex of Adult Rats...

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Neurobiology

Background:

• Early-life malnutrition significantly impacts brain development and function.
• Area 17 of the rat brain is crucial for visual processing.
• The long-term effects of malnutrition on specific neuronal populations and axon terminals are not fully understood.

Purpose of the Study:

• To investigate the effects of early-life malnutrition on biocytin-labeled axon terminals and NADPH-diaphorase (NADPH-d)-containing neurons in the adult rat's area 17.
• To compare the sensitivity of different neuronal populations to early nutritional deficiencies.

Main Methods:

• Wistar rats were subjected to a multideficient diet from gestation to 42 days, followed by a standard chow diet.
• Control rats received a standard chow diet throughout development.
• Biocytin and NADPH-d histochemistry were used to visualize axon terminals and specific neurons in area 17 of adult rats.

Main Results:

• Malnourished rats exhibited a reduction in the number of potential synaptic sites in biocytin-labeled axon terminals compared to controls.
• NADPH-d-containing neurons showed reduced soma area in the white matter and increased cell density in both grey and white matter of malnourished rats.
• No double-labeled cells were found, indicating distinct populations for NADPH-d neurons and biocytin-labeled terminals.

Conclusions:

• Early malnutrition differentially affects biocytin-labeled axon terminals and NADPH-d-containing neurons in rat area 17.
• NADPH-d-containing neurons appear to be less sensitive to the detrimental effects of early malnutrition compared to axon terminals.