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Transcranial manganese delivery for neuronal tract tracing using MEMRI
Tatjana Atanasijevic1, Nadia Bouraoud1, Dorian B McGavern2
1Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.
Transcranial manganese application allows for manganese-enhanced MRI (MEMRI) neuronal tracing in rats. Manganese ions applied to the skull can diffuse into the brain, enabling effective tracing to deeper brain regions.
Area of Science:
- Neuroscience
- Biomedical Imaging
Background:
- Manganese-enhanced MRI (MEMRI) is increasingly used for neuronal tract tracing.
- Traditionally, MEMRI involves direct injection of manganese into specific brain regions.
- Recent findings suggest manganese ions can permeate intact rodent skulls.
Purpose of the Study:
- To quantify local manganese concentrations in brain tissue after transcranial application.
- To determine the efficacy of neuronal tracing from the site of transcranial manganese delivery.
- To investigate the feasibility of non-invasive MEMRI tract tracing.
Main Methods:
- Transcranial application of manganese solutions to rat skulls.
- Quantification of local manganese concentrations in brain tissue using MRI.
- Assessment of neuronal tracing effectiveness to deeper brain areas.
Main Results:
- Transcranial manganese application resulted in detectable brain tissue enhancement.
- The extent of brain enhancement was dependent on the manganese application site on the skull.
- Manganese successfully traced neuronal pathways from the entry point to deeper brain structures.
Conclusions:
- Transcranial manganese application is a viable method for MEMRI.
- This non-invasive approach enables effective neuronal tract tracing in rodents.
- Further research can explore optimizing transcranial MEMRI for broader applications.
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