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Updated: Oct 22, 2025
Detection of MicroRNAs in Microglia by Real-time PCR in Normal CNS and During Neuroinflammation
Published on: July 23, 2012
Molecular MRI of Neuroinflammation: Time to Overcome the Translational Roadblock
Maxime Gauberti1, Sara Martinez de Lizarrondo2
1Normandie Univ, UNICAEN, INSERM, PhIND "Physiopathology and Imaging of Neurological Disorders", Institut Blood and Brain @ Caen-Normandie, Cyceron, 14000 Caen, France; CHU Caen, Department of Diagnostic Imaging and Interventional radiology, CHU de Caen Côte de Nacre, Caen, France.
Abstract:
The ability to detect a molecular target in the central nervous system non-invasively and at high spatial resolution using magnetic resonance imaging (MRI) has attracted the interest of researchers for several decades. Yet, molecular MRI studies remain restricted to the preclinical stage and the path to clinical translation remains unclear. The focus of molecular MRI of neuroinflammation has moved from parenchymal to vascular targets, that are more easily reachable by intravenously injected probes. This has allowed the use of large superparamagnetic probes, such as micro-sized particles of iron oxide (MPIO), that dramatically improved the sensitivity of molecular MRI compared to smaller contrast agents. In particular, recent studies demonstrated the feasibility of unraveling inflammation in the brain by MRI using MPIO able to bind activated endothelial cells with potential applications in neurovascular, neuroinflammatory and neurodegenerative disorders. In the present review, we present the most striking advances in the field and the remaining challenges that must be overcome before clinical use of molecular MRI of neuroinflammation.
Insights
Molecular MRI uses micro-sized particles of iron oxide (MPIO) to detect neuroinflammation via vascular targets. This enhances sensitivity for potential clinical applications in brain disorders.
Area of Science:
- Neuroimaging
- Biomedical Engineering
- Molecular Medicine
Background:
- Molecular magnetic resonance imaging (MRI) for central nervous system targets faces challenges in clinical translation.
- Focus has shifted to vascular targets for improved probe accessibility in neuroinflammation studies.
Purpose of the Study:
- To review advances in molecular MRI of neuroinflammation using micro-sized particles of iron oxide (MPIO).
- To discuss challenges hindering clinical translation of MPIO-based neuroimaging.
Main Methods:
- Utilizing large superparamagnetic probes like MPIO for enhanced MRI sensitivity.
- Developing MPIO that bind to activated endothelial cells in the brain.
Main Results:
- MPIO significantly improve molecular MRI sensitivity compared to smaller agents.
- Demonstrated feasibility of detecting brain inflammation using MPIO targeting endothelial cells.
Conclusions:
- MPIO-based molecular MRI shows promise for diagnosing neurovascular, neuroinflammatory, and neurodegenerative disorders.
- Further research is needed to overcome challenges for clinical application of MPIO in neuroinflammation imaging.
