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Temporal coding expands the bandwidth of GPCR-mediated neuromodulation.
Xinyi Jenny He1,2, Mark von Zastrow1,2,3
1Department of Psychiatry and Behavioral Sciences, University of California, San Francisco, San Francisco CA, USA.
Biorxiv : the Preprint Server for Biology
|June 12, 2026
Summary
Neurons can distinguish rich neuromodulatory input despite limited G protein transducers. Different G protein-coupled receptors (GPCRs) use temporal coding to send distinct signals, overcoming potential information bottlenecks.
Area of Science:
- Neuroscience
- Molecular Biology
- Cellular Signaling
Background:
- Modern transcriptomics reveal extensive co-expression of neuromodulatory G protein-coupled receptors (GPCRs).
- A limited number of G protein transducers raises questions about information processing capacity in neuromodulatory systems.
Purpose of the Study:
- To investigate whether a single transducer pathway can differentiate signals from co-expressed GPCRs.
- To determine the information processing capacity of cellular neuromodulation.
Main Methods:
- Focused on four co-expressed GPCRs in hippocampal pyramidal neurons signaling via the Gs-coupled cyclic AMP (cAMP) cascade.
- Compared downstream effects of GPCR activation, including transcriptional response and functional responsiveness over time.
Main Results:
- All tested GPCRs induced similar acute cAMP elevation but exhibited divergent downstream effects.
- GPCRs differed significantly in their capacity to drive transcriptional responses.
- Neuropeptide receptors maintained responsiveness for hours, while monoamine receptors showed rapid desensitization.
Conclusions:
- The effective chemical bandwidth of GPCR-mediated neuromodulation is not limited by transducer availability.
- Temporal coding allows individual neurons to distinguish richer neuromodulatory inputs, overcoming potential information bottlenecks.
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