Abscisic Acid Enhances Hippocampal Neuroplasticity and Rescues Learning and Memory Deficits in a Valproate-Induced...

Area of Science:

• Neuroscience
• Pharmacology
• Biochemistry

Background:

• Autism spectrum disorder (ASD) is characterized by cognitive and neurological alterations.
• Valproate (VPA) exposure in rats can induce an autism-like phenotype.
• Abscisic acid (ABA), a phytohormone, possesses potential neuromodulatory effects.

Purpose of the Study:

• To investigate the neuroprotective effects of ABA in a VPA-induced rat model of autism.
• To assess ABA's impact on cognitive deficits, oxidative stress, and neuroplasticity markers.

Main Methods:

• Rats were exposed to VPA to model ASD.
• ABA was administered intra-hippocampally at varying doses.
• Spatial learning and memory were evaluated using the Morris water maze (MWM).
• Hippocampal oxidative stress biomarkers (H2O2, MDA) and neuroplasticity gene expression (BDNF, TrkB, PI3K, AKT) were quantified.

Main Results:

• VPA-induced rats displayed learning/memory deficits, increased oxidative stress, and reduced neuroplasticity gene expression.
• ABA treatment dose-dependently ameliorated cognitive impairments.
• High-dose ABA reduced oxidative stress and restored neuroplasticity gene expression.
• ABA's effects were blocked by nifedipine and chelerythrine, suggesting calcium channel and PKC involvement.

Conclusions:

• Abscisic acid demonstrates significant potential as a therapeutic agent for ASD.
• ABA may exert its effects by enhancing antioxidant defenses and neurotrophic signaling pathways.
• Further investigation is required to fully elucidate the mechanisms underlying ABA's therapeutic actions in ASD.