Microdissection of peripheral nerve: collagen and lipid distribution with morphological correlation

Area of Science:

• Neuroscience
• Biochemistry
• Histology

Background:

• Peripheral nerves are complex structures comprising endoneurial fascicles, perineurium, and epineurium.
• Understanding the biochemical composition of distinct nerve compartments is crucial for neurological research.

Purpose of the Study:

• To develop and validate a microdissection technique for isolating the endoneurium from human sural nerves.
• To assess the purity and yield of the isolated endoneurial fraction for biochemical studies.

Main Methods:

• Development of the "endoneurial plucking" microdissection technique.
• Separation of endoneurium from perineurium and epineurium in human sural nerves.
• Microscopic and biochemical analysis to verify the purity of the separated fractions.

Main Results:

• The "endoneurial plucking" method successfully isolated endoneurial contents (axons, myelin, Schwann cells, vessels) from connective tissue.
• High yield of endoneurial components was achieved, confirmed by microscopic and biochemical assessments.
• Sulfatide and unesterified sterols were predominantly found in the endoneurial fraction, while collagen was concentrated in the peri-epineurial fraction.

Conclusions:

• The "endoneurial plucking" technique provides a reliable method for obtaining pure endoneurial tissue from peripheral nerves.
• This microdissection approach is valuable for future biochemical investigations into peripheral nerve composition and function.