Abstract
Brain white matter is the means of efficient signal propagation in brain and its dysfunction is associated with many neurological disorders. We studied the effect of hyaluronan deficiency on the integrity of myelin in murine corpus callosum. Conditional knockout mice lacking the hyaluronan synthase 2 were compared with control mice. Ultrastructural analysis by electron microscopy revealed a higher proportion of myelin lamellae intruding into axons of knockout mice, along with significantly slimmer axons (excluding myelin sheath thickness), lower g-ratios, and frequent loosening of the myelin wrappings, even though the myelin thickness was similar across the genotypes. Analysis of extracellular diffusion of a small marker molecule tetramethylammonium (74 MW) in brain slices prepared from corpus callosum showed that the extracellular space volume increased significantly in the knockout animals. Despite this vastly enlarged volume, extracellular diffusion rates were significantly reduced, indicating that the compromised myelin wrappings expose more complex geometric structure than the healthy ones. This finding was confirmed in vivo by diffusion-weighted magnetic resonance imaging. Magnetic resonance spectroscopy suggested that water was released from within the myelin sheaths. Our results indicate that hyaluronan is essential for the correct formation of tight myelin wrappings around the axons in white matter.
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Acknowledgements
This work was supported by National Institutes of Health National Institute of Neurological Disorders and Stroke grant R01 NS047557 to SH and CA, National Institutes of Health National Institute of Neurological Disorders and Stroke grant R01 NS066019 to CA, National Institutes of Health National Institute of General Medical Sciences grant R25 GM097634 to CA, National Institutes of Health National Institute of Aging grant RF1 AG057579 to YY, National Institutes of Health National Eye Institute Core grant EY13079 to the Center for Neural Science, New York University, and National Institutes of Health National Center for Research Resources shared instrumentation grant S10 RR023534 to Nathan S. Kline Institute.
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All protocols for animal use were in accordance with the National Institute of Health Guidelines and approved by the local Institutional Animal Care and Use Committees at Sanford Burnham Prebys Medical Discovery Institute, State University of New York Downstate, and Nathan S. Kline Institute. This article does not contain any studies with human participants performed by any of the authors.
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Sherpa, A.D., Guilfoyle, D.N., Naik, A.A. et al. Integrity of White Matter is Compromised in Mice with Hyaluronan Deficiency. Neurochem Res 45, 53–67 (2020). https://doi.org/10.1007/s11064-019-02819-z
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DOI: https://doi.org/10.1007/s11064-019-02819-z