Complement Inhibition for Synapse Preservation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The specific molecular mechanisms underlying synapse elimination during neuronal circuit formation and refinement remain unclear, and synapse loss occurs early in neurodegenerative diseases like Alzheimer's, highlighting the need for therapeutic targets.

Innovation Solution

Specific complement proteins, such as C1q, are expressed by neurons and play a crucial role in synapse elimination, with agents that inhibit complement activation preventing synapse loss, offering potential therapeutic strategies for neurodegenerative conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If synapse elimination occurs during neuronal circuit refinement, then precise neuronal circuits are formed, but synapse loss occurs which may lead to neurodegenerative diseases

Engineering Contradiction:

Improveneuronal circuit precisionVSAvoidsynapse maintenance

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent identifies complement proteins (C1q, C3, C4) as intermediary molecules that mediate synapse elimination during neuronal circuit refinement. These complement proteins act as signaling molecules that mark synapses for elimination, enabling precise circuit formation while controlling the elimination process to prevent excessive synapse loss that could lead to neurodegenerative diseases.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent describes how the expression levels and activation states of complement proteins change during different developmental stages and pathological conditions. By modulating complement protein expression and activation parameters, the system achieves controlled synapse elimination during development while preventing pathological synapse loss in adult brains, thus resolving the contradiction between circuit precision and synapse maintenance.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If complement activation is enhanced to promote synapse elimination, then synapse pruning is improved, but excessive synapse loss occurs which may contribute to neurodegenerative diseases

Engineering Contradiction:

Improvesynapse elimination efficiencyVSAvoidsynapse loss

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The patent describes feedback mechanisms where complement protein activation is regulated by neuronal activity and developmental timing signals. During development, complement activation is promoted to achieve efficient synapse pruning, while in adult brains, feedback inhibition prevents excessive complement activation and synapse loss. This feedback control resolves the contradiction between elimination efficiency and synapse preservation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent highlights the dynamic nature of complement protein expression and activation, which changes over time and in response to physiological conditions. The system transitions from a high complement activation state during development (promoting synapse elimination) to a low activation state in adulthood (preserving synapses), dynamically adjusting the balance between elimination efficiency and synapse maintenance.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10330671B2Modulation of synaptic maintenance

Publication Date: 2019.06.25 THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV

AI summary

C1q is shown to be expressed in neurons, where it acts as a signal for synapse elimination. Methods are provided for protecting or treating an individual suffering from adverse effects of synapse loss. These findings have broad implications for a variety of clinical conditions, including Alzheimer's disease.