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• W4317861035 abstract "Abstract Background and Purpose The failure of neuroprotective treatment-related clinical trials, including stem cell therapies, may be partially due to a lack of suitable animal models. We have developed a stem cell-implantable radiopaque hydrogel microfiber that can survive for a long time in vivo. The microfiber is made of barium alginate hydrogel containing zirconium dioxide, fabricated in a dual coaxial laminar flow microfluidic device. We aimed to develop a novel focal stroke model using this microfiber. Methods Using male Sprague-Dawley rats (n = 14), a catheter (inner diameter, 0.42 mm; outer diameter, 0.55 mm) was navigated from the caudal ventral artery to the left internal carotid artery using digital subtraction angiography. A radiopaque hydrogel microfiber (diameter, 0.4 mm; length, 1 mm) was advanced through the catheter by slow injection of heparinized physiological saline to establish local occlusion. Both 9.4-T magnetic resonance imaging at 3 and 6 h and 2% 2,3,5-triphenyl tetrazolium chloride staining at 24 h after stroke model creation were performed. Neurological deficit score and body temperature were measured. Results The anterior cerebral artery-middle cerebral artery bifurcation was selectively embolized in all rats. Median operating time was 4 min (interquartile range [IQR], 3–8 min). Median infarct volume was 386 mm 3 (IQR, 354–420 mm 3 ) at 24 h after occlusion. No infarction of the thalamus or hypothalamus was seen. Body temperature did not change significantly over time ( P = 0.204). However, neurological deficit scores before and at 3, 6, and 24 h after model creation differed significantly ( P < 0.001). Conclusions We present a novel rat model of focal infarct restricted to the middle cerebral artery territory using a radiopaque hydrogel microfiber positioned under fluoroscopic guidance. By comparing the use of stem cell-containing versus non-containing fibers in this stroke model, it would be possible to determine the efficacy of pure cell transplantation in treating stroke." @default.
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• W4317861035 date "2023-01-24" @default.
• W4317861035 modified "2023-10-18" @default.
• W4317861035 title "A Novel Rat Model of Embolic Cerebral Ischemia Using a Cell-Implantable Radiopaque" @default.
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• W4317861035 doi "https://doi.org/10.21203/rs.3.rs-2498249/v1" @default.
• W4317861035 hasPublicationYear "2023" @default.
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