Low frequency amplitude modulated microwave fields change calcium efflux rates from synaptosomes

Area of Science:

• Neuroscience
• Biophysics
• Electromagnetic fields

Background:

• Synaptosomes are crucial for studying neuronal function, particularly calcium dynamics.
• Calcium ion (Ca2+) efflux is a key process in neurotransmission and neuronal signaling.
• Understanding how external factors influence calcium dynamics is vital for neuroscience.

Purpose of the Study:

• To investigate the effect of a specific microwave field on calcium efflux from synaptosomes.
• To determine if the observed effect is dependent on intracellular calcium levels.
• To explore the necessity of intact tissue for microwave-field interactions with synaptosomes.

Main Methods:

• Utilized a continuous perfusion technique to study 45Ca2+ efflux from preloaded synaptosomes.
• Calculated rate constants for a two-phase calcium efflux process.
• Applied a 16-Hz sinusoidally amplitude-modulated 450-MHz microwave field during the second efflux phase.

Main Results:

• A 16-Hz modulated microwave field increased the calcium efflux rate constant by 38%.
• Unmodulated or 60-Hz modulated microwave fields did not produce a significant effect.
• The microwave-induced calcium efflux differed from CaCl2-stimulated efflux, suggesting a non-intracellular origin.

Conclusions:

• Specific modulated microwave fields can alter synaptosomal calcium efflux dynamics.
• The observed effect on calcium efflux likely does not involve intracellular calcium pools.
• Microwave-field induced changes in synaptosome dynamics can occur without gross anatomically intact tissue.