Tissue structure of rat brain after microwave irradiation using maximum magnetic field component

Area of Science:

• Neuroscience
• Biophysics
• Histology

Background:

• Traditional microwave devices for brain tissue inactivation can cause disruptive artifacts.
• Homogeneous heat distribution is crucial for preserving tissue structure during rapid inactivation.

Purpose of the Study:

• To evaluate the tissue structural integrity of rodent brains after inactivation with a novel microwave instrument.
• To compare the effects of the new magnetic field-concentrating microwave device with conventional methods.

Main Methods:

• Utilized a new commercial microwave instrument focusing on the magnetic field component for inactivation.
• Performed histological examinations using light and electron microscopy on microwave-treated and decapitated rat brains.
• Assessed tissue structural integrity, including cellular and subcellular components, and inter-regional boundaries.

Main Results:

• Microwave-irradiated tissues showed altered staining affinity, vacuoles, and loss of fine fibrils, but preserved inter-regional boundaries.
• Electron microscopy revealed protein denaturation, chromatin aggregation, loss of Nissl bodies/ribosomes/neurofilaments, and irregular myelin.
• Crucially, nerve cell membranes, synaptic membranes, and synaptic vesicles remained intact, indicating minimal cellular damage.

Conclusions:

• The novel microwave instrument effectively inactivates rodent brain tissue without significant disruption or pressure-induced spreading.
• This magnetic field-concentrating microwave technology preserves essential neural structures, making it a valuable tool for neuroscience research.