Butyrate acts as a pan-HDAC inhibitor suppressing microglial HDAC3 activity. In dysbiosis, butyrate deficiency permits HDAC3 to deacetylate histones at the TREM2 promoter, downregulating TREM2 expression. This exacerbates the TREM2 loss-of-function AD risk phenotype (rs75932628), leading to impaired phagocytosis of Aβ/α-synuclein and metabolic microglial dysfunction (enhanced glycolysis, mitochondrial fragmentation). Undegraded aggregates further stimulate TLR pathways, completing a feedforward
TREM2-Dependent Astrocyte-Microglia Cross-talk in Neuroinflammation proposes that TREM2 dysfunction disrupts critical intercellular communication networks between microglia and astrocytes, leading to pathological neuroinflammation in neurodegenerative diseases. Under normal conditions, TREM2 signaling in microglia promotes the release of anti-inflammatory mediators including IL-10, TGF-β, and specialized pro-resolving mediators (SPMs) that maintain astrocytes in a homeostatic A2-like state. TREM
Convergent vs Divergent Predictions
This summary checks where the selected hypotheses point toward the same target or mechanism, and where they pull in opposite directions.
# Gut Microbiome Dysbiosis, TLR Signaling, and Neurodegeneration: Mechanistic Hypotheses
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## Hypothesis 1: SCFA Deficiency Drives Microglial Hyperactivation via GPR43/NF-κB Dysregulation
**Mecha...
Skeptic
# Critical Evaluation of Hypotheses: Gut Microbiome, TLR Signaling, and Neurodegeneration
## Overview
The seven hypotheses collectively present an interconnected framework linking gut dysbiosis to n...
Domain Expert
# Feasibility Assessment: Gut Microbiome–Neuroinflammation Axis in Neurodegeneration
## Methodology
I treat each hypothesis as an independent drug discovery program. For each surviving mechanism, I ...