The astrocytic metabolic trained immunity hypothesis proposes that perinatal immune activation fundamentally reprograms astrocytic cellular metabolism through the AMP-activated protein kinase (AMPK) and peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC1α) signaling axis. Upon exposure to PAMPs or DAMPs during critical developmental windows, astrocytic pattern recognition receptors, including TLR3 and TLR4, initiate calcium-dependent signaling cascades that activate calcium/calmodulin-dependent protein kinase kinase β (CaMKKβ), which subsequently phosphorylates and activates AMPK at threonine 172. Activated AMPK phosphorylates PGC1α at multiple serine residues (Ser538, Ser568), promoting its nuclear translocation and transcriptional coactivator function. Nuclear PGC1α forms complexes with nuclear respiratory factors 1 and 2 (NRF1/2) and estrogen-related receptor alpha (ERRα) to drive transcription of mitochondrial biogenesis genes including mitochondrial transcription factor A (TFAM), cytochrome c oxidase subunit IV (COX4), and ATP synthase subunits.
...Curated pathway from expert analysis
flowchart TD
A["Danger Signal<br/>Abeta / LPS Priming"]
B["mTOR Complex 1 Activation<br/>Nutrient and Stress Sensor"]
C["HIF-1alpha Stabilization<br/>Hypoxia-Response Gene Program"]
D["Trained Immunity Epigenetic Mark<br/>H3K4me3 at Inflammatory Loci"]
E["Exaggerated Cytokine Response<br/>Re-challenge Hyperactivation"]
F["Neuroinflammatory Bystander Damage<br/>Synaptic / Neuronal Loss"]
G["Rapamycin / mTOR Inhibitor<br/>Reset Trained Immunity"]
A --> B
B --> C
C --> D
D --> E
E --> F
G -.->|"blocks"| B
style A fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8
style F fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#1b5e20,stroke:#81c784,color:#81c784No linked papers recorded for this hypothesis yet.
Median TPM across 13 brain regions for PRKAA1/PPARGC1A from GTEx v10.
No clinical trials data linked to this hypothesis yet.
No curated ClinVar variants loaded for this hypothesis.
Run scripts/backfill_clinvar_variants.py to fetch P/LP/VUS variants.
No DepMap CRISPR Chronos data found for PRKAA1.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.