Integrated high-confidence and high-throughput approaches for quantifying synapse engulfment by oligodendrocyte...

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• Oligodendrocyte precursor cells (OPCs) play a role in shaping neural circuits by engulfing synapses.
• Existing methods for analyzing synapse engulfment by OPCs are limited, hindering detailed study.

Approach:

• A novel two-pronged cell biological approach combining low- and high-throughput methodologies was developed.
• Method 1: In vivo viral expression of a pH-sensitive synaptic marker to label engulfed synapses within OPCs.
• Method 2: Flow cytometry analysis of fluorescently labeled presynaptic material within isolated OPCs.

Key Points:

• The in vivo method allows quantification of synapses engulfed by individual OPCs in fixed tissue.
• The flow cytometry method enables high-throughput analysis of synaptic material within thousands of OPCs.
• These techniques are adaptable for studying synaptic phagocytosis by various glial cell types.

Conclusions:

• The integrated methods provide rigorous quantification of OPC-mediated synapse engulfment at individual and population levels.
• These approaches advance the study of synaptic pruning beyond current microglial-focused assays.
• The developed techniques offer a valuable tool for understanding neural circuit development and plasticity.