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Open AccessJournal ArticleDOI

Physiological Dynamics in Demyelinating Diseases: Unraveling Complex Relationships through Computer Modeling

TLDR
This work will discuss how computational modeling applied to questions at different biological levels can help link together disparate observations and decipher complex mechanisms whose solutions are not amenable to simple reductionism.
Abstract
Despite intense research, few treatments are available for most neurological disorders. Demyelinating diseases are no exception. This is perhaps not surprising considering the multifactorial nature of these diseases, which involve complex interactions between immune system cells, glia and neurons. In the case of multiple sclerosis, for example, there is no unanimity among researchers about the cause or even which system or cell type could be ground zero. This situation precludes the development and strategic application of mechanism-based therapies. We will discuss how computational modeling applied to questions at different biological levels can help link together disparate observations and decipher complex mechanisms whose solutions are not amenable to simple reductionism. By making testable predictions and revealing critical gaps in existing knowledge, such models can help direct research and will provide a rigorous framework in which to integrate new data as they are collected. Nowadays, there is no shortage of data; the challenge is to make sense of it all. In that respect, computational modeling is an invaluable tool that could, ultimately, transform how we understand, diagnose, and treat demyelinating diseases.

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Journal ArticleDOI

Four in vivo g‐ratio‐weighted imaging methods: Comparability and repeatability at the group level

TL;DR: The data showed that repeatability and comparability depend largely on the marker for the FVF (NODDI outperformed TFD), and that they were improved by masking, and that the calibration procedure is crucial, for example, calibration to a lower g‐ratio value than the commonly used one.
Journal ArticleDOI

Towards in vivo g-ratio mapping using MRI: Unifying myelin and diffusion imaging.

TL;DR: In this paper, the authors present a review of the most recent developments in the field, while also providing methodological background pertinent to aggregate g-ratio weighted mapping, and discussing pitfalls associated with these approaches.
Posted Content

Towards in vivo g-ratio mapping using MRI: unifying myelin and diffusion imaging

TL;DR: A second review on the topic of g-ratio mapping using MRI with a summary of the most recent developments in the field providing methodological background is published.
Journal ArticleDOI

Iron Oxide Nanoparticles Affects Behaviour and Monoamine Levels in Mice

TL;DR: Over expression of glial fibrillary acidic protein (GFAP) confirms the neuronal damage, suggesting the evidences for behavioural changes, and mitochondrial damage, depleted energy level and decreased ATPase activities were observed in mice exposed to Fe2O3-NPs.
References
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Journal ArticleDOI

Myelin-like sheaths in copepod axons

TL;DR: It is found that nerve fibres of many copepods seem to be designed for rapid signalling, and have well-developed myelin-like sheaths, like those that give a tenfold boost to the conduction speed of nerve impulses in vertebrates.
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Nerve excitability properties in Charcot–Marie–Tooth disease type 1A

TL;DR: In vivo assessment of multiple axonal excitability properties at the median nerve in CMT1A patients with PMP22 (peripheral myelin protein 22) gene duplication and 53 controls indicated altered cable properties, such that a greater proportion than normal of applied currents reached internodal rather than nodal axolemma.
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Depolarizing afterpotentials in myelinated axons of mammalian spinal cord.

TL;DR: Microelectrode recordings were made from 5-10 micron dia axons of adult rat spinal cord in vitro and it is argued that the electrical resistance of the myelin lamellae is relatively low, though within the range calculated for other glial membranes.
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Computational Modeling of Three-Dimensional Electrodiffusion in Biological Systems: Application to the Node of Ranvier ☆

TL;DR: A computational model is presented for the simulation of three-dimensional electrodiffusion of ions, and the algorithm has been validated and applied to a generalized node of Ranvier, where numerical results for computed action potentials agree well with cable model predictions for large clusters of voltage-gated ion channels.
Journal ArticleDOI

Multi-timescale modeling of activity-dependent metabolic coupling in the neuron-glia-vasculature ensemble.

TL;DR: A detailed biophysical model of the brain’s metabolic interactions provides a quantitative mathematical description of the metabolic activation in neurons and glial cells, as well as of the macroscopic measurements obtained during brain imaging.
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