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Quantitative analysis of macroscopic solute transport in the murine brain
- Source :
- Fluids and Barriers of the CNS, Vol 18, Iss 1, Pp 1-19 (2021), Fluids and Barriers of the CNS
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Background Understanding molecular transport in the brain is critical to care and prevention of neurological disease and injury. A key question is whether transport occurs primarily by diffusion, or also by convection or dispersion. Dynamic contrast-enhanced (DCE-MRI) experiments have long reported solute transport in the brain that appears to be faster than diffusion alone, but this transport rate has not been quantified to a physically relevant value that can be compared to known diffusive rates of tracers. Methods In this work, DCE-MRI experimental data is analyzed using subject-specific finite-element models to quantify transport in different anatomical regions across the whole mouse brain. The set of regional effective diffusivities ($$D_{eff}$$ D eff ), a transport parameter combining all mechanisms of transport, that best represent the experimental data are determined and compared to apparent diffusivity ($$D_{app}$$ D app ), the known rate of diffusion through brain tissue, to draw conclusions about dominant transport mechanisms in each region. Results In the perivascular regions of major arteries, $$D_{eff}$$ D eff for gadoteridol (550 Da) was over 10,000 times greater than $$D_{app}$$ D app . In the brain tissue, constituting interstitial space and the perivascular space of smaller blood vessels, $$D_{eff}$$ D eff was 10–25 times greater than $$D_{app}$$ D app . Conclusions The analysis concludes that convection is present throughout the brain. Convection is dominant in the perivascular space of major surface and branching arteries (Pe > 1000) and significant to large molecules (> 1 kDa) in the combined interstitial space and perivascular space of smaller vessels (not resolved by DCE-MRI). Importantly, this work supports perivascular convection along penetrating blood vessels.
- Subjects :
- Male
Perivascular transport
Brain transport
Interstitial transport
Convection
Biotransport
Mice
Cellular and Molecular Neuroscience
Murine brain
Glymphatic
Developmental Neuroscience
Animals
RC346-429
Chemistry
Research
Brain
Biological Transport
General Medicine
Models, Theoretical
Magnetic Resonance Imaging
Mice, Inbred C57BL
Dynamic contrast-enhanced MRI
Neurology
Biophysics
Female
Neurology. Diseases of the nervous system
Quantitative analysis (chemistry)
Glymphatic System
Subjects
Details
- ISSN :
- 20458118
- Volume :
- 18
- Database :
- OpenAIRE
- Journal :
- Fluids and Barriers of the CNS
- Accession number :
- edsair.doi.dedup.....84f7eec608b3a6ebbb18ee27a4845305
- Full Text :
- https://doi.org/10.1186/s12987-021-00290-z