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• W2763462624 abstract "Background: Postoperative Cognitive Dysfunction (POCD) has received considerable attention as one of the main postoperative complications. The underlying mechanism of POCD in elderly subjects has not been fully elucidated to date. The Central Nervous System (CNS) is isolated from the bloodstream by the Blood Brain Barrier (BBB) that consists of endothelial cells, capillary blood vessels and tight junctions. The tight junctions carry out significant biological functions that are associated with the CNS and blood circulation. Methods: In this review, I present a hypothesis that blood-brain barrier disruption leads to postoperative cognitive dysfunction. A total of 81 healthy male Wistar rats were used for the present study. All the experimental animals were randomly divided into 3 groups: normal control group, isoflurane group and splenectomy group. The control group was not subjected to any form of treatment. The rats in isoflurane group were given 1.5-2% isoflurane under intubation and mechanical ventilation. The rats in splenectomy group underwent splenectomy under the same anesthesia as the isoflurane group. The Morris water maze was used to examine the learning and memory ability of the animals. The expression of the Tight Junctions Proteins (TJPs) in the hippocampus was analyzed using Western blotting. The concentration of Evans Blue (EB) in the supernatant was analyzed using UV spectroscopy. Ultrastructure changes in the basal laminas, the Tight Junctions (TJs), mitochondria and the endoplasmic reticulum surrounding the capillaries were assessed by Transmission Electron Microscopy (TEM). Results: Following splenectomy, the rats displayed concomitant significant cognitive deficits in the Morris water maze test. Taken together, the results indicate that the expression levels of occludin (65KD) following splenectomy were reduced on days one and three in aged rats. No significant difference was noted in the expression levels of claudin-5, except for a reduction after surgery on day one. The leakage of EB was higher following splenectomy than control group and isoflurane group. The ultrastructure of the neurovascular unit was monitored on the day prior to surgery and on the 1st, 3rd and 7th day following surgery using a transmission electronmicroscope. Conclusion: The alterations in the levels of tight junction proteins following splenectomy may contribute to the BBB permeability increase, which in turn will induce postoperative cognitive dysfunction. Keywords: Postoperative cognitive dysfunction (POCD), blood-brain barrier (BBB), tight junction, surgery, hippocampus, splenectomy." @default.
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• W2763462624 date "2018-01-17" @default.
• W2763462624 modified "2023-10-18" @default.
• W2763462624 title "Blood-brain Barrier Disruption Leads to Postoperative Cognitive Dysfunction" @default.
• W2763462624 doi "https://doi.org/10.2174/1567202614666171009105825" @default.
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