ATP as a multi-target danger signal in the brain

Area of Science:

• Neuroscience
• Cell Biology
• Neuroinflammation

Background:

• Extracellular adenosine triphosphate (ATP) is released in an activity-dependent manner from various brain cells.
• ATP functions as a neurotransmitter, neuromodulator, and mediates cell-to-cell communication, involving P2 receptors (P2R) and adenosine receptors.
• Brain injury triggers sustained extracellular ATP increases, signaling danger and promoting neuroinflammation.

Purpose of the Study:

• To investigate the multifaceted roles of extracellular ATP as a danger signal in the brain.
• To explore the therapeutic potential of targeting purinergic receptors for neuroprotection.

Main Methods:

• Analysis of ATP release and its effects on different brain cell types.
• Examination of P2 receptor (P2R) and adenosine receptor activation.
• Evaluation of neuroprotective effects by blocking specific receptors like P2X7R, P2Y1R, and adenosine A2A receptors (A2AR).

Main Results:

• Extracellular ATP contributes to neuronal damage susceptibility, astrogliosis, and microglia-driven neuroinflammation.
• Blockade of P2X7R, P2Y1R, and A2AR receptors shows neuroprotective effects.
• The precise interplay, cooperation, and redundancy of these receptor pathways remain to be fully elucidated.

Conclusions:

• Extracellular ATP acts as a critical danger signal in brain injury, orchestrating complex cellular responses.
• Targeting multiple purinergic receptors simultaneously holds promise for developing effective neuroprotective therapies against brain damage.