Valproic acid reduces spatial working memory and cell proliferation in the hippocampus

Area of Science:

• Neuroscience
• Pharmacology
• Cell Biology

Background:

• Valproic acid (VPA) is a widely prescribed anticonvulsant and mood stabilizer.
• VPA is known to inhibit histone deacetylase enzymes, impacting cell proliferation.
• Cognitive impairments have been reported in patients using VPA.

Purpose of the Study:

• To investigate the relationship between VPA, cognitive function, and cell proliferation in the hippocampus.
• To explore the potential mechanism underlying VPA-induced cognitive deficits.

Main Methods:

• Rats were treated with VPA via intraperitoneal injection.
• Cell proliferation in the dentate gyrus subgranular zone was assessed.
• Hippocampus-dependent spatial memory was tested using the novel object location task.
• Levels of brain-derived neurotrophic factor (BDNF), Notch 1, and doublecortin were measured.

Main Results:

• VPA treatment significantly reduced cell proliferation in the hippocampus.
• Impaired performance in the spatial memory test was observed in VPA-treated rats.
• VPA caused a significant reduction in hippocampal BDNF and Notch 1 levels.

Conclusions:

• VPA may induce cognitive impairment by reducing hippocampal neurogenesis.
• Decreased neurogenesis and altered neurotrophic factor levels are potential mechanisms for VPA's cognitive side effects.