Depression
Does astrocyte pyroptosis help explain stress depression in mice?
Open access · cc by · source: Europe PMC
In a mouse chronic-mild-stress model, hippocampal astrocytes died by NLRP3/caspase-1/GSDMD pyroptosis; knocking out that cascade (or giving an SSRI) eased depression-like behavior, while putting GSDMD-N back in astrocytes wiped out the benefit.
Study at a glance
- Design
- Animal / in-vitro — Mouse chronic mild stress (CMS) plus astrocyte-targeted NLRP3/Casp-1/GSDMD genetics and SSRI treatment; hippocampal pyroptosis and depression-like behavior
- N
- N=8 · Typical behavioral cohorts n = 8 mice/group; immunoblots n = 4/group; mixed WT, NLRP3-cKO, Casp-1−/−, GSDMD−/− lines
- Population
- Male C57BL/6J mice (WT, astrocytic NLRP3-cKO, Casp-1 and GSDMD knockouts) under CMS
- Outcome
- Depression-like behavior (SPT/FST) and astrocytic NLRP3/Casp-1/GSDMD pyroptosis in hippocampus
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Key findings
CMS cut sucrose preference by week 6 and raised FST immobility. Depressive mice showed astrocytic pyroptosis and astrocyte loss; SSRIs reduced that pyroptosis. Genetic KO of GSDMD, Casp-1, or astrocytic NLRP3 improved behavior and lowered pyroptosis proteins; hippocampal GSDMD-N overexpression reversed GSDMD-KO benefits.
Methodology
Exposed male C57BL/6J mice to CMS for up to 6 weeks (SPT/FST), measured hippocampal Casp-1/GSDMD/IL-1β and astrocytic pyroptosis, then used GSDMD, Casp-1, and astrocytic NLRP3 knockouts plus SSRI (fluoxetine/citalopram) and astrocytic GSDMD-N overexpression.
Limitations
Mouse CMS is not human MDD; targeting NLRP3/GSDMD is a mechanistic hypothesis, not a licensed antidepressant strategy, and n is small per group.
How this study connects
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