Abstract
Objective
Characterization of the nerve components by deuterium double quantum-filtered magnetization transfer (DQF-MT) NMR.
Methods
Nerves were equilibrated in deuterated saline and 2H single-pulse and 2H DQF-MT NMR spectra were measured, enabling the separation of the different water compartments, according to their quadrupolar splittings.
Results
Rat sciatic and brachial nerves and porcine optic nerve immersed in deuterated saline yielded 2H DQF spectra composed of three pairs of quadrupolar-split signals assigned to the water in the collagenous compartments and the myelin bilayer and one narrow signal assigned to the axonal water. Stretching of the nerves, application of osmotic stress and incubation in collagenase did not affect the quadrupolar splitting of the myelin water. The signals of myelin and axonal water were shown to decay during Wallerian degeneration and to rise during maturation. The chemical exchange between the myelin and the intra-axonal water was measured for optic nerve during maturation. The quadrupolar splitting of the signal of myelin water was not sensitive to its orientation relative to the magnetic field. This resembles liquid crystalline behavior, but leaves its mechanism open for interpretation.
Conclusions
2H DQF-MT NMR characterizes the different components of nerves, the water exchange between them and their changes during processes such as nerve maturation and Wallerian degeneration.
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US‐Israel Binational Science Foundation, grant number 2013253.
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HS: study conception and design, acquisition of data, analysis and interpretation of data, and drafting of manuscript. UE: acquisition of data, analysis, and interpretation of data. GN: study conception and design, analysis and interpretation of data, and drafting of manuscript.
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The experimental protocol in the present study was approved by Committee for Ethics of Animal Experimentation of Tel Aviv University.
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Deceased: Uzi Eliav December 19, 2019.
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Shinar, H., Eliav, U. & Navon, G. Deuterium double quantum-filtered NMR studies of peripheral and optic nerves. Magn Reson Mater Phy 34, 889–902 (2021). https://doi.org/10.1007/s10334-021-00949-6
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DOI: https://doi.org/10.1007/s10334-021-00949-6