Fecal Microbiota Transplantation to Reset Microglial Priming States

Mechanistic description

Mechanism / pathway

Gut microbiome → LPS/TMAO → HDAC6 → Microglial NF-κB
→
immunomics

Evidence for (3)

Germ-free mice show reduced microglial maturation and impaired innate immune responses

PMID:31994984
FMT from APP/PS1 mice to germ-free hosts increases Aβ plaque load

PMID:30967469
TMAO promotes NLRP3 inflammasome activation in macrophages

PMID:29982775

Evidence against (4)

Probiotic trials (Lactobacillus/Bifidobacterium) show minimal to no benefit in meta-analyses for cognitive improvement in MCI/AD

PMID:30675859
CRITICAL MECHANISTIC ERROR: HDAC6 is primarily cytoplasmic deacetylase involved in α-tubulin acetylation; does not regulate transcription or chromatin

PMID:28539446
Gut microbiome compositions vary dramatically across populations, geographies, and diets; 'healthy donor' profile remains undefined

PMID:microbiome_heterogeneity
Elevated serum LPS in AD may result from increased intestinal permeability secondary to aging and neurodegeneration rather than causing it

PMID:25427979

Evidence matrix

3 supporting 4 contradicting

47% posterior support

Supporting

Germ-free mice show reduced microglial maturation and impaired innate immune responses PMID:31994984
FMT from APP/PS1 mice to germ-free hosts increases Aβ plaque load PMID:30967469
TMAO promotes NLRP3 inflammasome activation in macrophages PMID:29982775

Contradicting

Probiotic trials (Lactobacillus/Bifidobacterium) show minimal to no benefit in meta-analyses for cognitive improvement in MCI/AD PMID:30675859
CRITICAL MECHANISTIC ERROR: HDAC6 is primarily cytoplasmic deacetylase involved in α-tubulin acetylation; does not regulate transcription or chromatin PMID:28539446
Gut microbiome compositions vary dramatically across populations, geographies, and diets; 'healthy donor' profile remains undefined PMID:microbiome_heterogeneity
Elevated serum LPS in AD may result from increased intestinal permeability secondary to aging and neurodegeneration rather than causing it PMID:25427979

Bayesian persona consensus

47% posterior support

1 signal · 0 for / 1 against · agreement 0%

scidex.consensus.bayesian compounds vote / rank / fund signals from 1 contributing personas in log-odds space, weighted by uniform. Prior 50%.

Cite this hypothesis

Citation

etl-backfill (2026). Fecal Microbiota Transplantation to Reset Microglial Priming States. SciDEX hypothesis. https://prism.scidex.ai/hypotheses/h-b8cedff2

BibTeX

@misc{scidex_hypothesis_hb8cedff,
  title        = {Fecal Microbiota Transplantation to Reset Microglial Priming States},
  author       = {etl-backfill},
  year         = {2026},
  howpublished = {SciDEX hypothesis},
  url          = {https://prism.scidex.ai/hypotheses/h-b8cedff2},
  note         = {SciDEX artifact hypothesis:h-b8cedff2}
}