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Researchers identified neural pathways controlling sighs. Activating specific neurons in the preBötzinger Complex (preBötC) can trigger sighs, revealing key mechanisms in respiratory control.

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Area of Science:

  • Neuroscience
  • Respiratory Physiology

Background:

  • Sighing is a vital respiratory behavior.
  • The neural circuits controlling sigh generation remain largely unknown.

Purpose of the Study:

  • To investigate the neural mechanisms underlying the generation of sighs.
  • To identify specific neuronal populations and pathways involved in sigh production.

Main Methods:

  • Utilized photostimulation and chemogenetic/optogenetic activation techniques in rodent models.
  • Targeted specific neuronal populations, including parafacial (pF) neuromedin B (NMB) or gastrin releasing peptide (GRP) neurons, and preBötzinger Complex (preBötC) NMBR or GRPR and SST neurons.

Main Results:

  • Photostimulation of pF NMB/GRP or preBötC NMBR/GRPR neurons elicited sighs.
  • Ectopic sighs were induced independently of peptide receptor activation in preBötC.
  • Activation of preBötC SST neurons also induced sighing, even with antagonists present.

Conclusions:

  • Sigh generation involves increased excitability of preBötC NMBR/GRPR neurons, potentially independent of their peptide receptors.
  • PreBötzinger Complex SST neurons act downstream in the sigh generation circuit, converting normal breaths into sighs.