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Neurotransmitter co-transmission: synaptic architectures, functional logic, and emerging tools
1Department of Neurosciences, University of New Mexico, Albuquerque, NM, United States.
Frontiers in Molecular Neuroscience
|July 3, 2026
Summary
Neurons use multiple neurotransmitters (co-transmission) for complex signaling, challenging the single-transmitter view. This versatile mechanism enhances neural circuit flexibility, precision, and context-dependence.
Area of Science:
- Neuroscience
- Cellular Biology
- Systems Neuroscience
Background:
- Traditional neuroscience viewed neurons as single-transmitter systems.
- Emerging evidence highlights neurotransmitter co-transmission as a fundamental principle.
- Co-transmission involves complex synaptic architectures and distinct release rules.
Purpose of the Study:
- To review the current understanding of neurotransmitter co-transmission.
- To explore the organizational principles and functional implications of co-transmission.
- To discuss challenges and future directions in studying multi-transmitter neurons.
Main Methods:
- Integration of molecular profiling, electrophysiology, and high-resolution anatomy.
- Utilizing optogenetics and genetically encoded neurotransmitter sensors.
- Multimodal strategies to link synaptic architecture to release dynamics and circuit function.
Main Results:
- Co-transmission expands signaling across multiple timescales.
- It enhances target specificity and allows dynamic shifts in transmitter balance.
- Distinct organizational modes impose specific rules for release and target engagement.
Conclusions:
- Neurotransmitter co-transmission is a versatile mechanism enhancing neural circuit output flexibility and precision.
- It challenges the canonical view of single-transmitter neurons.
- Future research requires multimodal approaches to understand co-transmission in vivo.
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