Key Points
- The research aimed to identify the pacemaker properties of respiratory neurons in the pre-Bötzinger complex and their behavior when synaptic inputs are absent.
- Extracellular recording of neuronal activity in neonatal rat medulla slices was performed.
- Whole cell recordings utilized a low-Ca2+/high-Mg2+ solution to eliminate synaptic inputs.
- Neurons were classified based on spike discharge patterns in both low-Ca2+ and control solutions.
- Sixty-three neurons generated rhythmic bursts of action potentials in low-Ca2+ solution.
- I neurons displayed continuous bursting behavior in low-Ca2+ solution (5 of 33), while tonic E neurons did not (0 of 13).
- Rhythmic bursting properties were confirmed in subpopulations of ventral respiratory group neurons even without synaptic transmission.
Structured PICO
PPopulationMedullary slices from neonatal rats containing the pre-Bötzinger complex (pre-BötC) and ventral respiratory group (VRG)
IInterventionBathing slices in a low-Ca2+/high-Mg2+ solution to eliminate endogenous respiratory synaptic inputs and electrically evoked synaptic inputs
CComparatorControl solution (reactivating the respiratory network)
OOutcomePresence of rhythmic bursting properties (pacemaker behavior) in respiratory neurons in the absence of synaptic transmissionsurrogate
Subpopulations of respiratory neurons in the neonatal rat medulla exhibit intrinsic pacemaker properties in the absence of synaptic transmission, supporting their role in respiratory rhythm generation.