Neuromodulation: purinergic signaling in respiratory control

Area of Science:

• Neuroscience
• Respiratory Physiology
• Cellular Signaling

Background:

• The respiratory neural network controls breathing rhythm and homeostasis.
• Purinergic signaling via adenosine triphosphate (ATP) is crucial for respiratory reflexes.
• ATP's effects are modulated by its metabolites and diverse purinergic receptors (P2X, P2Y, P1).

Purpose of the Study:

• To review the roles of the three-component purinergic signaling system in respiratory control.
• To explore how ATP signaling mediates chemosensitivity to hypoxia and CO2/pH.
• To examine the modulation of respiratory networks and cerebral vasculature by purinergic signaling.

Main Methods:

• Review of cellular, synaptic, and network-level studies on purinergic signaling.
• Analysis of ATP metabolism by ectonucleotidases.
• Examination of purinergic receptor expression in neurons, glia, and vasculature.

Main Results:

• ATP signaling, along with its metabolites ADP and adenosine, intricately regulates neuronal and network excitability.
• The respiratory system exhibits chemosensitivity to hypoxia and CO2/pH, mediated by purinergic signaling.
• Purinergic signaling modulates respiratory rhythm generators, inspiratory motoneurons, and cerebral blood flow.

Conclusions:

• The interplay between ATP, its metabolites, and purinergic receptors is fundamental to respiratory homeostasis and function.
• Understanding this complex purinergic system is key to comprehending respiratory control and related disorders.
• Purinergic signaling influences respiratory chemosensitivity, motor output, and cerebrovascular regulation.