Microglia modulate respiratory rhythm generation and autoresuscitation

Area of Science:

• Neuroscience
• Immunology
• Respiratory Physiology

Background:

• Inflammation is linked to breathing disorders like apnea and Sudden Infant Death Syndrome.
• Proinflammatory mediators can suppress breathing, and peripheral inflammation activates microglia, key immune cells in the central nervous system.

Purpose of the Study:

• To investigate the role of microglia in modulating respiratory rhythm generation and autoresuscitation.
• To determine if microglial activation or inhibition affects breathing control under normoxic and hypoxic conditions.

Main Methods:

• Respiratory rhythm generation was measured in vivo and in vitro, focusing on the preBötzinger complex.
• Microglial activators and inhibitors were applied intracisternally or in the recording bath.
• Autoresuscitation after hypoxia was assessed following microglial activation.

Main Results:

• Microglial activators and inhibitors modulated respiratory rhythm generation in both normoxia and hypoxia.
• Lipopolysaccharide-induced microglial activation impaired autoresuscitation, an effect reversed by minocycline.
• Inhibition or depletion of microglia altered respiratory rhythm generation.

Conclusions:

• Microglia play a crucial role in modulating respiratory rhythm generation.
• Microglia influence the autoresuscitation process following hypoxic events.
• Targeting microglia may offer therapeutic potential for respiratory control disorders.