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Sympathetic neuronal oscillators are capable of dynamic synchronization
Summary
Sympathetic neuron activity is driven by multiple oscillators. Central respiratory drive (CRD) dynamically synchronizes these oscillators, influencing sympathetic nervous system function and potentially temporal pattern coding.
Area of Science:
- Neuroscience
- Physiology
Background:
- Sympathetic nervous system (SNS) controls involuntary bodily functions.
- Understanding the control mechanisms of sympathetic neuron activity is crucial for physiological research.
Purpose of the Study:
- To investigate the role of central respiratory drive (CRD) in synchronizing sympathetic neuron discharges.
- To explore dynamic synchronization in postganglionic sympathetic neurons (PGNs).
Main Methods:
- Recorded activity from rat tail artery PGNs at population (ventral collector nerve - VCN) and single-pair levels.
- Utilized autospectral, autocorrelation, cross-correlation, and time-evolving spectral analysis.
Main Results:
- CRD enhanced rhythmical components in VCN activity, indicating entrainment of oscillators.
- PGN pairs showed increased synchronization with enhanced CRD.
- Interactions between PGNs and CRD exhibited dynamic temporal stability.
Conclusions:
- Multiple oscillators drive sympathetic neuron discharges and can be dynamically synchronized by CRD.
- This study presents the first evidence of dynamic synchronization in populations of single PGNs.
- Temporal pattern coding may be significant in sympathetic pathways.