Abstract
The clearance of brain interstitial fluid (ISF) is important in maintaining brain homeostasis. ISF clearance impairment leads to toxic material accumulation in the brain, and ischemic stroke could impair ISF clearance. The present study investigates ISF clearance under normal and ischemic conditions. The carboxylate-modified FluoSpheres beads (0.04 μm in diameter) were injected into the striatum. Sham or transient middle cerebral artery occlusion surgeries were performed on the mice. The brain sections were immunostained with cell markers, and bead distribution at various time points was examined with a confocal microscope. Primary mouse neuronal cultures were incubated with the beads to explore in vitro endocytosis. Two physiological routes for ISF clearance were identified. The main one was to the lateral ventricle (LV) through the cleft between the striatum and the corpus callosum (CC)/external capsule (EC), where some beads were captured by the ependymal macrophages and choroid plexus. An alternative and minor route was to the subarachnoid space through the CC/EC and the cortex, where some of the beads were endocytosed by neurons. After ischemic stroke, a significant decrease in the main route and an increase in the minor route were observed. Additionally, microglia/macrophages engulfed the beads in the infarction. In conclusion, we report that the physiological clearance of ISF and beads mainly passes through the cleft between the CC/EC and striatum into the LV, or alternatively through the cortex into the subarachnoid space. Stroke delays the main route but enhances the minor route, and microglia/macrophages engulf the beads in the infarction.
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The datasets analyzed and used during the current study are available from the corresponding author on reasonable request.
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This work was supported in part by the National Institutes of Health (NS092810), and start-up funds from the Pittsburgh Institute of Brain Disorders and Recovery and the Department of Neurology of the University of Pittsburgh. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. We thank Pat Strickler for her administrative support.
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TY and FZ designed the research. YS, TY, QL, NA, and FZ performed the experiments. YS, TY, and FZ analyzed and/or interpreted the data. TY and FZ drafted and revised the manuscript.
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Yang, T., Sun, Y., Li, Q. et al. Effects of Ischemic Stroke on Interstitial Fluid Clearance in Mouse Brain: a Bead Study. Cell Mol Neurobiol 43, 4141–4156 (2023). https://doi.org/10.1007/s10571-023-01400-1
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DOI: https://doi.org/10.1007/s10571-023-01400-1