Objective To evaluate the mental disorders in mice with thioacetamide ( TAA) -induced acute hepatic encephalopathy ( AHE) .Methods Thirty male Kunming mice were equally and randomly divided into two groups ( treatment group and control group) . Mice in the treatment group received an intraperitoneal injection of TAA ( 200 mg·kg-1·d-1for 3 days, up to 600 mg·kg-1) , as compared with the same volume of physiological saline in the control group. Neurological function score, light /dark box, open field, and elevated plus-maze test were used to determine behavioral parameters at 24 h after the model was established. Serum ammonia, aspartate amino transferase ( AST) , alanine aminotransferase ( ALT) , and total bilirubin ( TBil) were measured at 24 h post determination of behavioral parameters. Comparison between two groups was made by independent-samples t test. Results In the light /dark box test, the treatment group had significantly reduced residence time in the light box and number of shuttles between two boxes ( t =-4. 006, P < 0. 01; t =-2. 656, P < 0. 05) ; in the open field test, the treatment group had significantly reduced central distance, central time, and number of vertical movements ( t =-3. 639, P < 0. 05;t =-2. 294, P < 0. 05; t =-2. 282, P < 0. 05) , as well as increased grooming time ( t = 5. 992, P < 0. 01) ; meanwhile, the number of open-arm entries and residence time in the open arm for the treatment group were also reduced in the elevated plus-maze test, as compared with the control group ( t =-3. 584, P < 0. 05; t =-3. 992, P < 0. 05) . However, the total distance in the open field test showed no significant difference between the two groups ( t =-0. 96, P > 0. 05) . Moreover, compared with the control group, the treatment group had significantly higher levels of serum ammonia ( t =-3. 168, P < 0. 05) , ALT ( t = 4. 316, P < 0. 05) , AST ( t =-2. 581, P < 0. 05) , and TBil ( t =-9. 127, P < 0. 01) . Conclusion Mice with AHE induced by an intraperitoneal injection of low-dose TAA have anxiety-related behaviors; the anxiety-related behaviors are not associated with reduced locomotor activities.
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