Astrocyte networks modulate respiration - sniffing glue

Area of Science:

• Neuroscience
• Respiratory Physiology
• Glial Biology

Background:

• Astrocytes, once considered mere support cells, are increasingly recognized for their active roles in neural function.
• The respiratory system relies on complex neuronal networks in the brainstem for rhythm generation and control.
• Emerging evidence suggests glial cells, including astrocytes, participate in modulating these vital respiratory networks.

Purpose of the Study:

• To review recent discoveries on astrocyte involvement in respiratory control.
• To explore astrocyte-neuronal interactions at cellular and network levels within respiratory centers.
• To highlight the role of specific gliotransmitters, such as PGE2, in respiratory modulation.

Main Methods:

• Review of existing literature on astrocyte function in respiratory control.
• Analysis of studies investigating astrocyte-neuronal interactions in brainstem respiratory centers.
• Examination of research on gliotransmitter release and its impact on respiratory network activity.

Main Results:

• Rhythmically active astrocytes have been identified within key respiratory control centers: the preBötzinger Complex and the parafacial respiratory group/retrotrapezoid nucleus.
• These astrocytes form interconnected glial subnetworks that integrate with neuronal circuits.
• Astrocytes modulate respiratory network behavior through the release of gliotransmitters, notably prostaglandin E2 (PGE2), especially under hypoxic and hypercapnic conditions.

Conclusions:

• Astrocytes play a significant, active role in the modulation of breathing.
• Glial subnetworks and gliotransmitter release represent novel mechanisms influencing respiratory network function.
• Understanding astrocyte-neuronal interactions is crucial for comprehending respiratory control and its adaptation to physiological stress.