Ascorbic Acid Attenuates Lead-Induced Alterations in the Synapses in the Developing Rat Cerebellum

Area of Science:

• Neuroscience
• Developmental Biology
• Toxicology

Background:

• Lead (Pb) exposure during pregnancy is a significant public health concern, potentially impacting fetal neurodevelopment.
• The cerebellum is particularly vulnerable to neurotoxic insults during critical developmental windows.

Purpose of the Study:

• To investigate the protective effects of ascorbic acid against lead-induced cerebellar developmental toxicity in rat pups.
• To evaluate the impact of maternal lead exposure and ascorbic acid supplementation on cerebellar synaptic protein expression and axonal integrity.

Main Methods:

• Pregnant rats were divided into control, lead-exposed, and lead plus ascorbic acid groups.
• Cerebellar development was assessed at postnatal day 21 using immunohistochemistry, immunoblot assays, and Luxol fast blue staining.
• Blood lead levels and expression of synaptic proteins (synaptophysin, PSD-95, NMDAR1), and brain-derived neurotrophic factor (BDNF) were analyzed.

Main Results:

• Lead exposure significantly reduced Purkinje cells, presynaptic and postsynaptic proteins, and axonal fibers in the cerebellum.
• Lead exposure decreased cerebellar BDNF levels, while ascorbic acid treatment normalized these levels.
• Ascorbic acid supplementation significantly ameliorated lead-induced impairments in cerebellar synaptic proteins and axonal development.

Conclusions:

• Maternal ascorbic acid administration can prevent lead-induced cerebellar developmental deficits in rat pups.
• Ascorbic acid shows potential as a therapeutic agent to mitigate the neurotoxic effects of lead during critical developmental periods.
• The findings highlight the importance of nutritional interventions in protecting against environmental neurotoxicants.