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• W3204281142 abstract "Objective: Hepatic encephalopathy (HE) is a neuropsychiatric syndrome caused by liver failure and by an impaired neurotransmission and neurological function caused by hyperammonemia (HA). HE, in turn, decreases the phosphorylation of protein kinase C epsilon (PKCε), contributing to the impairment of neuronal functions. Dehydroepiandrosterone (DHEA) exerts a neuroprotective effect by increasing the GABAergic tone through GABA A receptor stimulation. Therefore, we investigated the protective effect of DHEA in an animal model of HE, and the possible modulation of PKCε expression in different brain area. Methods: Fulminant hepatic failure was induced in 18 male, Sprague–Dawley rats by i.p. administration of 3 g/kg D-galactosamine, and after 30 min, a group of animals received a subcutaneous injection of 25 mg/kg (DHEA) repeated twice a day (3 days). Exploratory behavior and general activity were evaluated 24 h and 48 h after the treatments by the open field test. Then, brain cortex and cerebellum were used for immunoblotting analysis of PKCε level. Results: DHEA administration showed a significant improvement of locomotor activity both 24 and 48 h after D-galactosamine treatment ( **** p &lt; 0.0001) but did not ameliorate liver parenchymal degeneration. Western blot analysis revealed a reduced immunoreactivity of PKCε ( * p &lt; 0.05) following D-galactosamine treatment in rat cortex and cerebellum. After the addition of DHEA, PKCε increased in the cortex in comparison with the D-galactosamine-treated ( *** p &lt; 0.001) and control group ( * p &lt; 0.05), but decreased in the cerebellum ( * p &lt; 0.05) with respect to the control group. PKCε decreased after treatment with NH 4 Cl alone and in combination with DHEA in both cerebellum and cortex ( **** p &lt; 0.0001). MTS assay demonstrated the synergistic neurotoxic action of NH 4 Cl and glutamate pretreatment in cerebellum and cortex along with an increased cell survival after DHEA pretreatment, which was significant only in the cerebellum ( * p &lt; 0.05). Conclusion: An association between the DHEA-mediated increase of PKCε expression and the improvement of comatose symptoms was observed. PKCε activation and expression in the brain could inhibit GABA-ergic tone counteracting HE symptoms. In addition, DHEA seemed to ameliorate the symptoms of HE and to increase the expression of PKCε in cortex and cerebellum." @default.
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• W3204281142 date "2021-09-28" @default.
• W3204281142 modified "2023-10-01" @default.
• W3204281142 title "Possible Association Between DHEA and PKCε in Hepatic Encephalopathy Amelioration: A Pilot Study" @default.
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• W3204281142 doi "https://doi.org/10.3389/fvets.2021.695375" @default.
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