Lighting up necrotic neurons from traumatic brain injury with magnetic quantum dots to decode the cellular origin of MRI.

A manganese-doped near-infrared magnetic quantum dot enables MRI-linked fluorescence that is selectively phagocytosed by activated microglia after systemic dosing in TBI.

• Why it matters: Conventional imaging cannot directly visualize the pathological cellular events that shape TBI progression and outcomes, limiting interpretation of MRI signals.
• What they did: The team used whole-brain clearing with cellular-resolution 3D panoptic optical imaging plus in vitro studies across TBI-relevant cell types, comparing the magnetic QD with a similarly sized Fe3O4 nanoparticle.
• The result: Microglia-mediated tropism toward regions rich in dead neurons and neuronal debris decodes the cellular origin of the MRI contrast, turning MRI into a pathological reporter.

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