Quantitative optical coherence microscopy of neuron morphology in human entorhinal cortex

Area of Science:

• Neuroscience
• Biomedical Optics
• Histology

Background:

• Neuron size and shape are critical indicators of brain aging and neurodegenerative diseases.
• Traditional histology methods for analyzing human brain tissue introduce significant 3D reconstruction distortions.
• Existing tissue clearing techniques are challenging to apply to whole human brains.

Purpose of the Study:

• To present a novel label-free quantitative optical coherence microscopy (OCM) technique for analyzing human neuron morphology.
• To quantify and compare morphological parameters of neurons in different layers of the human entorhinal cortex (EC).

Main Methods:

• Developed a label-free quantitative optical coherence microscopy (OCM) technique.
• Utilized the intrinsic back-scattering property of tissue for 3D neuron identification.
• Quantified neuron area, length, width, and orientation in human EC layers II and III.

Main Results:

• High-resolution mapping revealed significant differences in neuron size, shape, and orientation between EC layers II and III.
• OCM results were validated using standard Nissl staining on the same tissue samples.

Conclusions:

• The developed quantitative OCM technique provides a new method for analyzing neuron organization in the human brain.
• This approach offers novel insights into understanding neurodegenerative diseases by enabling detailed neuronal morphological analysis.