Single administration of vitamin C produces rapid antidepressant-like effects in female mice: A possible role of dopamine D2 receptor signalling.

BACKGROUND

The lifetime prevalence of depression is significantly higher in women. But the lack of ideal antidepressant severely limits therapies for female specific depressive disorders like perinatal depression. Herein, we evaluated whether vitamin C (ascorbic acid), a widely used nutritional supplement and perinatal therapeutic agent, could serve as a potential treatment for female-related depressive disorders using a chronic restraint stress (CRS) mouse model.

METHODS

C57BL/6 adult female mice were submitted to a 14-day CRS paradigm to induce depression-like behaviors. The antidepressant potential of vitamin C (200 mg/kg, i.p., a single dose) were assessed in CRS-exposed female mice that exhibited depression-like phenotype. Furthermore, we explored the underlying mechanisms through RNA sequencing, western blotting, and pharmacological interventions.

RESULTS

Vitamin C rapidly ameliorated depression-like phenotypes in CRS-exposed female mice within 24 h. The sucrose preference test indicated that the antidepressant effect of vitamin C lasted for more than 72 h. Transcriptome sequencing analysis revealed that vitamin C reversed CRS-induced transcriptional alterations in 104 genes in the medial prefrontal cortex (mPFC) of female mice, including the dopamine receptor D2 (D2R). Western blotting confirmed that CRS suppressed the D2R-ERK1/2-CREB-BDNF pathway in the mPFC, which was effectively rescued by vitamin C. The antidepressant effect of vitamin C was antagonized by the D2R antagonist sulpiride. Additionally, protein-protein interaction network analysis revealed functional linkages between D2R and other vitamin C-regulated stress-sensitive genes.

CONCLUSIONS

Our findings suggest that vitamin C may serve as an ideal candidate for the treatment of depression in females, potentially through the restoration of the D2R-BDNF pathway.