Mechanical stimulation evokes rapid increases in extracellular adenosine concentration in the prefrontal cortex

Area of Science:

• Neuroscience
• Biochemistry
• Biomedical Engineering

Background:

• Mechanical forces can trigger cellular responses, including the release of signaling molecules.
• Adenosine is a key neuromodulator involved in various brain functions, including neuroprotection.
• Understanding adenosine release mechanisms is crucial for interpreting brain activity and developing new therapeutic strategies.

Purpose of the Study:

• To investigate the release of adenosine in the prefrontal cortex in response to mechanical stimulation.
• To determine the characteristics and underlying mechanisms of mechanically evoked adenosine release.
• To assess the potential neuroprotective role of this adenosine signaling.

Main Methods:

• Utilized carbon-fiber microelectrodes and fast-scan cyclic voltammetry for real-time adenosine measurement.
• Applied mechanical perturbations in vivo and in brain slices of the prefrontal cortex.
• Investigated the involvement of neural activity (calcium, sodium channels) and extracellular ATP metabolism (NTDPase inhibition).

Main Results:

• Mechanical stimulation evoked transient adenosine release in the prefrontal cortex (in vivo and in slices).
• Adenosine release was activity-dependent, requiring calcium and sodium channel function.
• A portion of the released adenosine was dependent on extracellular ATP metabolism via nucleoside triphosphate diphosphohydrolase (NTDPase).

Conclusions:

• Mechanical perturbations, such as probe insertion, induce rapid, transient adenosine signaling in the brain.
• This mechanically stimulated adenosine release is activity-dependent and linked to extracellular ATP metabolism.
• The findings suggest a potential neuroprotective mechanism activated by mechanical stimuli in the brain.