Rivastigmine reverses cognitive deficit and acetylcholinesterase activity induced by ketamine in an animal model of schizophrenia.

Abstract

Schizophrenia is one of the most disabling mental disorders that affects up to 1 % of the population worldwide. Although the causes of this disorder remain unknown, it has been extensively characterized by a broad range of emotional, ideational and cognitive impairments. Studies indicate that schizophrenia affects neurotransmitters such as dopamine, glutamate and acetylcholine. Recent studies suggest that rivastigmine (an acetylcholinesterase inhibitor) is important to improve the cognitive symptoms of schizophrenia. Therefore, the present study evaluated the protective effect of rivastigmine against the ketamine-induced behavioral (hyperlocomotion and cognitive deficit) and biochemical (increase of acetylcholinesterase activity) changes which characterize an animal model of schizophrenia in rats. Our results indicated that rivastigmine was effective to improve the cognitive deficit in different task (immediate memory, long term memory and short term memory) induced by ketamine in rats. Moreover, we observed that rivastigmina reversed the increase of acetylcholinesterase activity induced by ketamine in the cerebral cortex, hippocampus and striatum. However, rivastigmine was not able to prevent the ketamine-induced hyperlocomotion. In conslusion, ours results indicate that cholinergic system might be an important therapeutic target in the physiopathology of schizophrenia, mainly in the cognition, but additional studies should be carried.

• Authors: Alexandra I Zugno, Ricardo Filipe Julião, Josiane Budni, Ana Maria Volpato, Daiane B Fraga, Felipe D Pacheco, Pedro F Deroza, Renata D Luca, Mariana B de Oliveira, Alexandra S Heylmann, João Quevedo
• Journal: Metabolic brain disease (Metab Brain Dis) Vol. 28 Issue 3 Pg. 501-8 (Sep 2013) ISSN: 1573-7365 [Electronic] United States
• PMID: 23775300 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Cholinesterase Inhibitors
• Excitatory Amino Acid Antagonists
• Neuroprotective Agents
• Phenylcarbamates
• Ketamine
• Acetylcholinesterase
• Rivastigmine

Topics

• Acetylcholinesterase (metabolism)
• Analysis of Variance
• Animals
• Avoidance Learning (drug effects)
• Behavior, Animal (drug effects)
• Brain (drug effects, enzymology)
• Cholinesterase Inhibitors (pharmacology)
• Cognition Disorders (chemically induced, psychology)
• Electroshock
• Excitatory Amino Acid Antagonists (pharmacology)
• Ketamine (pharmacology)
• Male
• Memory (drug effects)
• Memory, Short-Term (drug effects)
• Motor Activity (drug effects)
• Neuroprotective Agents (pharmacology)
• Phenylcarbamates (pharmacology)
• Rats
• Rats, Wistar
• Rivastigmine
• Schizophrenia (chemically induced, enzymology)
• Schizophrenic Psychology