The circadian-regulated expression of complement regulators CD55 and CD46 on synaptic membranes establishes a temporal gating mechanism for microglial synaptic engulfment that operates independently of classical complement cascade activation. During wake states, high CD55/CD46 expression creates protective microdomains through direct protein-protein interactions with microglial surface receptors TREM2 and P2Y12, effectively masking synaptic 'eat-me' signals. CD55's GPI anchor allows rapid latera
**Molecular Mechanism and Rationale**
The differential expression of complement regulators CD55 (decay-accelerating factor, DAF) and CD46 (membrane cofactor protein, MCP) on synaptic membranes represents a sophisticated molecular mechanism for spatial regulation of complement-mediated synaptic pruning. CD55 functions as a membrane-bound glycoprotein that accelerates the decay of both classical and alternative pathway C3 and C5 convertases (C4b2a, C3bBb, and C3b2Bb) by dissociating the enzymatic
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.
# Therapeutic Hypotheses: Selectivity of Complement-Mediated Synaptic Elimination During Prolonged Anesthesia
---
## Hypothesis 1: Activity-Dependent Synaptic Tagging via CREB-BDNF TrkB Signaling
*...
Skeptic
# Critical Evaluation of Hypotheses for Complement-Mediated Synaptic Selectivity
## Overview
These hypotheses address a legitimate gap in understanding how C1q distinguishes between synapses for eli...
Domain Expert
# Feasibility Assessment: Selectivity Mechanisms in Anesthesia-Induced Synaptic Elimination
## Executive Summary
The central question—whether specific synapses become targets for complement-mediated...
Synthesizer
{
"ranked_hypotheses": [
{
"title": "Differential Complement Regulator Expression on Synaptic Membranes (CD55/CD46)",
"description": "Excitatory synapses on specific neuronal compart...
Differential Complement Regulator Expression on Sy
4 rounds · quality: 0.75
Theorist
# Therapeutic Hypotheses: Selectivity of Complement-Mediated Synaptic Elimination During Prolonged Anesthesia
---
## Hypothesis 1: Activity-Dependent Synaptic Tagging via CREB-BDNF TrkB Signaling
*...
Skeptic
# Critical Evaluation of Hypotheses for Complement-Mediated Synaptic Selectivity
## Overview
These hypotheses address a legitimate gap in understanding how C1q distinguishes between synapses for eli...
Domain Expert
# Feasibility Assessment: Selectivity Mechanisms in Anesthesia-Induced Synaptic Elimination
## Executive Summary
The central question—whether specific synapses become targets for complement-mediated...
Synthesizer
{
"ranked_hypotheses": [
{
"title": "Differential Complement Regulator Expression on Synaptic Membranes (CD55/CD46)",
"description": "Excitatory synapses on specific neuronal compart...