Detecting neuroinflammation with molecular MRI

Yanez Lopez, Maria (2015) Detecting neuroinflammation with molecular MRI. PhD thesis, University of Nottingham.

PDF (Thesis - as examined) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Available under Licence Creative Commons Attribution Non-commercial No Derivatives.
Download (10MB) | Preview


The work in this thesis is focused on the study of neuroinflammation with molecular magnetic resonance imaging (MRI) methods. Neuroinflammation is a response of the central nervous system to pathological insult and it is present in many neurological disorders, such as Alzheimer’s disease. Being able to image neuroinflammation non-invasively with MRI techniques would have an important clinical value for diagnosis and assessment of therapy effectiveness. The aim of this work is to develop and validate an MR biomarker of neuroinflammation using MR Spectroscopy (MRS) and chemical exchange saturation transfer imaging (CEST). First, intravenous administration of lipopolysaccharide (LPS) is used as a mild inflammatory stimulus in wild type mice and in a mouse model of Alzheimer’s disease (AD). Elevated levels of the osmolyte myo-inositol, measured with MRS and microglia activation are found in AD mice after LPS administration. Due to the inherent low spatial resolution of MRS, a CEST MRI method is developed next. A myo-inositol CEST protocol is optimised, using Matlab simulations based on the Bloch-McConnell equations for a three pool model, in order to maximize the contrast and to estimate the amount of signal that can be expected in vivo. In vitro and in vivo tests are presented and a fast CEST sequence is developed, while the experimental difficulties and limitations of the technique are discussed. A CEST protocol is finally applied to evaluate the metabolite response to an LPS inflammatory challenge using MRS and histology as validation. A correlation is described between CEST and MRS myo-inositol levels, as well as between CEST and microglia concentration (Iba1 immunostaining), which highlight the potential of CEST as a non-invasive in vivo neuroinflammatory biomarker.

Item Type: Thesis (University of Nottingham only) (PhD)
Supervisors: Faas, Henryk
Auer, D.
Keywords: MRI, CEST, MRS, Myo-inositol, Biomarker, Neuroinflammation, Alzheimer's, Molecular
Subjects: W Medicine and related subjects (NLM Classification) > WL Nervous system
Faculties/Schools: UK Campuses > Faculty of Medicine and Health Sciences > School of Medicine
Item ID: 30599
Depositing User: Yanez Lopez, Maria
Date Deposited: 21 Apr 2016 10:30
Last Modified: 24 Dec 2017 01:58

Actions (Archive Staff Only)

Edit View Edit View