The secretion of soluble complement regulators CD55 and CD46 by reactive astrocytes represents a non-cell-autonomous mechanism for regulating complement-mediated synaptic pruning during neuroinflammation. Unlike membrane-bound forms, astrocyte-derived soluble CD55 (sCD55) and CD46 (sCD46) are generated through matrix metalloproteinase-mediated shedding, particularly by MMP-9 and ADAM17, which cleave near the GPI anchor site for CD55 and within the transmembrane domain for CD46. These soluble reg
**Molecular Mechanism and Rationale**
Astrocytic release of soluble complement regulators CD55 and CD46, rather than membrane-bound expression, represents a dynamic mechanism for spatiotemporal control of complement-mediated synaptic pruning. Astrocytes constitutively express high levels of CD55 and CD46, which undergo metalloproteinase-mediated shedding via ADAM10 and ADAM17 cleavage at defined juxtamembrane sites, generating soluble forms (sCD55, sCD46) that retain full complement regulatory
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...
Astrocytic Complement Regulator Release Modulates
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...