Developmental origin of preBötzinger complex respiratory neurons

Area of Science:

• Neuroscience
• Developmental Biology
• Respiratory Physiology

Background:

• A subset of neurons in the preBötzinger Complex (preBötC) expressing neurokinin 1 receptor (NK1R) and somatostatin peptide (SST) are vital for breathing.
• The developmental origins and relationships of these neurons with other glutamatergic neurons in the preBötC remain unclear.

Purpose of the Study:

• To investigate the developmental origins of preBötC neurons involved in respiration.
• To determine the role of Dbx1-derived neurons in the generation of respiratory behaviors.

Main Methods:

• Utilized genetic lineage tracing in mice to identify the origin of preBötC neurons.
• Examined gene expression patterns (NK1R, SST2aR) in Dbx1-derived neurons.
• Assessed respiratory activity in Dbx1 mutant mice using in vivo and in vitro preparations.

Main Results:

• Dbx1-expressing progenitors generate a heterogeneous population of ventrolateral medulla (VLM) glutamatergic neurons, including preBötC SST(+)/NK1R(+) neurons.
• Dbx1-derived neurons are respiratory modulated and exhibit inspiratory firing patterns.
• Loss of Dbx1 function abolished glutamatergic neurons in the respiratory VLM and eliminated spontaneous respiratory behaviors in vivo and in vitro.

Conclusions:

• PreBötC core neurons are a subset of a larger Dbx1-derived neuronal population in the VLM.
• Dbx1-derived neurons are indispensable for the generation and expression of respiratory behaviors.
• These findings highlight the critical role of Dbx1-derived VLM neurons in establishing the respiratory network.