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- W2382245611 abstract "AIM: To study the effects of cholecystokinin octapeptide (CCK-8) on cerebral cortex injury during endotoxic shock (ES) and its mechanisms. METHODS: Rabbits were injected intravenously with lipopolysaccharide (LPS, 8 mg/kg) to establish ES model. Rabbits (n=32, 8 in each group) were randomly assigned to receive one of four treatments intravenously: normal saline (as control), LPS, CCK-8 pretreatment 30 min before LPS, proglumide (Pro, nonspecific antagonist of CCK receptors) pretreatment 30 min before LPS. The changes of mean arterial pressure (MAP) were measured. The morphologic changes in cerebral cortex were observed through light microscope (LM) and transmission electron microscope (TEM). The alterations of activities of nitric oxide synthase (NOS) and superoxide dismutase (SOD), contents of nitric oxide (NO) and malondialdehyde (MDA) in cerebral cortex were assayed. The expressions of protein of inducible NOS (iNOS) and neuronal NOS (nNOS) were detected by immunohistochemistry staining in cerebral cortex in 4 groups of Sprague-Dawley (SD) rats (n=12, 3 in each group) which were grouped as that of the rabbits. RESULTS: LPS administration resulted in lower MAP than that in control group (P0.01). Hydropic degeneration of neurons and severe injuries to capillaries were observed in cerebral cortex of ES rabbits. LPS administration induced the expression of iNOS protein in the cytoplasm of neurocytes, and lead to stronger positive signals of nNOS than that in control group. NOS activity, NO_2ˉ/NO_3ˉ level and MDA content were higher (P0.05, P0.01 and P0.01), while SOD activity was lower in cerebral cortex of ES rabbits than those in control group (P0.01). CCK-8 pre-administration alleviated the changes induced by LPS, while Pro pre-administration aggravated those alterations. CONCLUSION: CCK-8 protects brain tissues against the injury induced by LPS, which may be associated with its effects of suppressing the overproduction of NO and free radicals." @default.
- W2382245611 created "2016-06-24" @default.
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- W2382245611 date "2005-01-01" @default.
- W2382245611 modified "2023-09-27" @default.
- W2382245611 title "Effects of cholecystokinin octapeptide on cerebral cortex injury during endotoxic shock" @default.
- W2382245611 hasPublicationYear "2005" @default.
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