7, 8-Dihydroxyflavone Ameliorates Depression-Like Behaviors in Mice Induced by Toxoplasma gondii via the BDNF-TrkB Signaling Pathway.

Chronic toxoplasmosis has been increasingly associated with behavior disorders, including depression-like behaviors, while the underlying mechanisms remain poorly understood. In this study, we demonstrated that chronic toxoplasmosis induced depression-like behaviors in mice, which were observed together with neuroinflammation, neuronal injury, and suppression of the BDNF-TrkB pathway. Treatment with the TrkB agonist 7,8-DHF alleviated these behavioral deficits by restoring BDNF-TrkB signaling, preserving neuronal function, and reducing neuroinflammation through inhibition of NF-κB and MAPK pathways. Additionally, 7,8-DHF also reduced astrocyte overactivation and protected blood-brain barrier structure integrity. These findings highlight that disruption of BDNF-TrkB signaling contributes to T. gondii-induced behavioral abnormalities and that targeting this pathway may represent a promising therapeutic strategy against neuroinflammation and neuronal damage associated with chronic infection.