Multispectral MRI with Dual Fluorinated Probes to Track Mononuclear Cell Activity in Mice.

Abstract:

:Background MRI with fluorine 19 (19F) probes has shown an ability to track immune cell activity with a specific, stable, and quantitative signal. In addition, the chemical shift differences of selected 19F probes make dual-probe imaging possible. To improve 19F MRI sensitivity for dual-probe imaging, optimal fluorine probes are needed. Purpose To develop multispectral 19F MRI to image immune cell activity in vivo using 19F nanoparticles of two distinct fluorocarbons. Materials and Methods Both 19F nanoparticles formulated with two fluorocarbons with distinct resonance frequencies and a high fluorine payload were characterized in terms of size, stability, MR profile, and relaxation times at 7 T. 19F MRI sensitivity was tested on labeling cells both in vitro and in vivo in C57BL/6 mice after conditional ablation of myeloid cells through the inhibition of colony-stimulating factor-1 receptor (CSF1Ri) to monitor the change of immune cells phagocytosis. Fluorine MRI data were acquired at the resonance frequency of each fluorocarbon by using a three-dimensional fast spin-echo sequence. Fluorescent dyes were also inserted into 19F nanoparticles to allow flow-cytometric and confocal microscopy analysis of labeled cells. Fluorine signal-to-noise ratio (SNR) was compared by using two-way repeated measures analysis of variance with Bonferroni post hoc correction. Results Fluorine MRI demonstrated high sensitivity and high specificity in the imaging of mononuclear cells both in vitro and in vivo. In combination with proton MRI, a map of 19F nuclei from each fluorocarbon was obtained without overlaps or artifacts. In vitro cell viability was unchanged, and 8000 cells with a high SNR (>8) were detected. In vivo high fluorine signal was observed in the bone marrow (SNR > 15) immediately after CSF1Ri treatment interruption, which correlated with high uptake by neutrophils and monocytes at flow cytometry. Conclusion By assessing in vivo MRI of mononuclear cell phagocytic ability with 19F nanoparticles, MRI with dual 19F probes can effectively track immune cell activity in combination with current MRI protocols. © RSNA, 2019 Online supplemental material is available for this article. See also the editorial by Bulte in this issue.

journal_name

Radiology

journal_title

Radiology

authors

Chirizzi C,De Battista D,Tirotta I,Metrangolo P,Comi G,Bombelli FB,Chaabane L

doi

10.1148/radiol.2019181073

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

351-357

issue

2

eissn

0033-8419

issn

1527-1315

journal_volume

291

pub_type

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