ArticleThe international journal of neuropsychopharmacology2026
Inhibition of FKBP51 alleviates depressive-like behaviors via AKT/mTOR-dependent autophagy and synaptic plasticity.
Article in The international journal of neuropsychopharmacology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- FKBP51 inhibition by SAFit2 modulates tau pathology and cognitive deficits in PS19 mice.Alzheimer's research & therapy · 2026Article
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8 authors.
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Abstract
backgroundDepression is a major global health problem, the pathogenesis of which remains to be elucidated, and current antidepressants exhibit limited efficacy. FK506-binding protein 51 (FKBP51) has been identified as a key modulator of stress-related psychiatric disorders, yet further research is required in depression.
methodsWe investigated the role of hippocampal FKBP51 using a chronic unpredictable mild stress rat model and stereotaxic FKBP5 overexpression. The antidepressant effect of the FKBP51 inhibitor, selective antagonist of FKBP51 by induced fit 2 (SAFit2), was evaluated in corticosterone-induced depression model both in vivo and in vitro. Molecular and structural changes were analyzed using quantitative polymerase chain reaction, Western blotting, Golgi-Cox staining, transmission electron microscopy, and immunofluorescence. SH-SY5Y cells were utilized to examine autophagic flux and dissect downstream pathways.
resultsHippocampal FKBP51 was upregulated in chronic unpredictable mild stress-susceptible rats and correlated with depressive-like behaviors. Functionally, FKBP5 overexpression mimicked stress pathologies, inducing autophagic hyperactivation and suppressing AKT/mTOR signaling. Mechanistically, corticosterone enhanced the recruitment of the phosphatase PHLPP to FKBP51, thereby inhibiting the AKT/mTOR pathway. SAFit2 treatment disrupted the FKBP51-PHLPP interaction, reactivated the AKT/mTOR pathway, normalized autophagic flux, restored neuroplasticity, and attenuated depressive-like behaviors.
conclusionsStress-induced FKBP51 upregulation drives depressive-like behaviors in male rats by impairing neuroplasticity and inducing autophagic hyperactivation via the PHLPP-AKT-mTOR pathway. SAFit2 exhibited antidepressant-like effects by targeting this axis, highlighting FKBP51 as a potential target for depression.
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