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- W2093722115 abstract "We evaluated the neuroprotective effect of geranylgeranylacetone (GGA), an antiulcer agent and inducing agent of heat-shock protein (HSP), against the delayed death of hippocampal neurons induced by transient bilateral occlusion of the common carotid artery (CCA) and hypotension (40 mm Hg) lasting for 10 min. To test the hypothesis that orally administered GGA would induce protein kinase C (PKC), leading to the expression of HSP70 and protection against delayed neuronal death (DND), we gave GGA orally to rats in various regimens prior to bilateral occlusion of the CCA, and quantitatively assessed the extent of DND in region CA1 of the hippocampus at 7 days after transient ischemia. Pretreatment with a single oral dose of GGA of 800 mg/kg at 48 h before ischemia significantly attenuated DND (20.0 ± 3.81 vs. 321.0 ± 11.01 mm3; p < 0.05). A similar degree of neuron sparing occurred when GGA was given 2, 4, or 8 days before ischemia. These neuroprotective effects of GGA were prevented by pretreatment with chelerythrine (CHE), a specific inhibitor of PKC, indicating that PKC may mediate GGA-dependent protection against ischemic DND. Oral GGA-induced expression of HSP70 elicited the expression of PKCδ, and pretreatment with GGA enhanced the ischemia-induced expression of HSP70, both of which effects were prevented by pretreatment with CHE. These results suggest that a single oral dose of GGA induces the expression of PKCδ and promotes the expression of HSP70 in the brain, and that GGA plays an important role in neuroprotection against DND. Pretreatment with a single oral dose of GGA provides an important tool for exploring the mechanisms of neuroprotection against DND of hippocampal neurons after transient ischemia." @default.
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- W2093722115 date "2006-07-01" @default.
- W2093722115 modified "2023-10-12" @default.
- W2093722115 title "Role of Protein Kinase C in Neuroprotective Effect of Geranylgeranylacetone, a Noninvasive Inducing Agent of Heat Shock Protein, on Delayed Neuronal Death Caused by Transient Ischemia in Rats" @default.
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- W2093722115 doi "https://doi.org/10.1089/neu.2006.23.1164" @default.
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