PreBötzinger complex and pacemaker neurons: hypothesized site and kernel for respiratory rhythm generation

Area of Science:

• Neuroscience
• Physiology

Background:

• The generation of respiratory rhythm is a fundamental question in physiology and neurobiology.
• Recent advances in experimental preparations, particularly rodent brainstem slices, have facilitated progress.

Purpose of the Study:

• To investigate the role of the preBötzinger Complex in generating respiratory rhythm.
• To explore the mechanisms underlying respiratory rhythmogenesis.

Main Methods:

• Utilized in vitro en bloc and slice preparations of rodent brainstem.
• Performed lesions and disrupted synaptic transmission within the preBötzinger Complex.
• Investigated neuronal properties, including endogenous bursting.

Main Results:

• Disruption of the preBötzinger Complex abolished respiratory activity.
• Respiratory rhythm persisted after interfering with postsynaptic inhibition.
• Identified neurons with endogenous bursting properties within the preBötzinger Complex.

Conclusions:

• The preBötzinger Complex is hypothesized to contain neuronal circuits essential for respiratory rhythm generation.
• Rhythmogenesis is proposed to result from synchronized activity of pacemaker or group-pacemaker neurons within the preBötzinger Complex.