Development of Na+-K+-ATPase in neonatal rat brain synaptosomes after perinatal protein malnutrition

Area of Science:

• Neuroscience
• Developmental Biology
• Nutritional Science

Background:

• Maternal nutrition during gestation and lactation critically influences offspring neurodevelopment.
• The Na+-K+-ATPase enzyme is vital for maintaining neuronal membrane potential and function.

Purpose of the Study:

• To investigate the impact of maternal protein restriction during specific periods of gestation and lactation on rat pup brain Na+-K+-ATPase activity.
• To determine if protein deprivation affects cerebral and cerebellar synaptosomal Na+-K+-ATPase activity.

Main Methods:

• Rats were assigned to four dietary groups differing in protein content (27% or 10% casein) during gestation and lactation.
• Body weight was recorded.
• Na+-K+-ATPase specific activity was measured in synaptosomes isolated from cerebral and cerebellar tissues of pups at various ages (1, 7, 14, and 21 days).

Main Results:

• Protein-deprived pups (group D-D) exhibited significantly reduced body weight compared to controls (group C-C).
• Na+-K+-ATPase activity was comparable between control and protein-deprived groups at 1 and 7 days.
• By 14 and 21 days, protein deprivation significantly reduced Na+-K+-ATPase activity in both cerebral and cerebellar synaptosomes.
• Cerebellar ATPase activity recovered in groups with adequate lactation protein (C-D, D-C), but cerebral ATPase activity in group C-D remained lower than controls.

Conclusions:

• Maternal protein restriction during lactation, even with adequate gestation nutrition, impairs the development of Na+-K+-ATPase activity in rat brains, particularly in the cerebrum.
• Adequate protein intake during lactation is essential for normalizing Na+-K+-ATPase activity in developing brain regions.
• These findings highlight the critical role of lactation nutrition in supporting optimal neurodevelopment.