Sulforaphane protects developing neural networks from VPA-induced synaptic alterations

Area of Science:

• Neuroscience
• Toxicology
• Developmental Biology

Background:

• Prenatal exposure to certain chemicals can disrupt brain development and lead to neurodevelopmental disorders by increasing oxidative stress.
• Valproic acid (VPA) exposure during pregnancy is linked to autism spectrum disorders (ASD) due to induced oxidative stress and synaptic alterations.

Purpose of the Study:

• To investigate if activating cellular antioxidant mechanisms can prevent VPA-induced synaptic alterations in developing neural networks.
• To determine the neuroprotective potential of sulforaphane (SFN), a potent activator of the NRF2 pathway, against VPA-induced neurotoxicity.

Main Methods:

• Utilized VPA exposure to model chemically induced ASD in neurodevelopmental models.
• Administered sulforaphane (SFN) to activate the nuclear factor erythroid 2-related factor 2 (NRF2) pathway.
• Assessed gene expression of antioxidant and synapse-related genes, and measured synapse formation and neural activity in response to VPA and SFN treatments.

Main Results:

• SFN activated NRF2, upregulating antioxidant gene expression and mitigating oxidative stress caused by VPA.
• SFN treatment prevented VPA-induced reductions in synapse formation and normalized neural activity in mouse cortical neurons.
• SFN enhanced the expression of genes crucial for synapse formation, indicating a protective effect on neural network development.

Conclusions:

• SFN demonstrates significant neuroprotective capabilities against VPA-induced developmental toxicity by enhancing antioxidant defenses and promoting synaptic development.
• The findings highlight SFN's potential to safeguard developing neural networks during critical windows of synapse formation.
• Molecular signatures of SFN-mediated neuroprotection may offer insights for developing strategies against other environmental toxicants impacting neurodevelopment.