Behavioral indices in antipsychotic drug discovery. 2010

Roger D Porsolt, and Paul C Moser, and Vincent Castagné
Porsolt & Partners Pharmacology, Boulogne-Billancourt, France. rporsolt@porsolt.com

Schizophrenia is characterized by three major symptom classes: positive symptoms, negative symptoms, and cognitive deficits. Classical antipsychotics (phenothiazines, thioxanthenes, and butyrophenones) are effective against positive symptoms but induce major side effects, in particular, extrapyramidal symptoms (EPS). The discovery of clozapine, which does not induce EPS and is thought effective against all three classes of symptom, has driven research for novel antipsychotics with a wider activity spectrum and lower EPS liability. To increase predictiveness, current efforts aim to develop translational models where direct parallels can be drawn between the processes studied in animals and in humans. The present article reviews existing procedures in animals for their ability to predict compound efficacy and EPS liability in relation to their translational validity. Rodent models of positive symptoms include procedures related to dysfunction in central dopamine and glutamatergic (N-methyl-D-aspartate) and serotonin (5-hydroxytryptamine) neurotransmission. Procedures for evaluating negative symptoms include rodent models of anhedonia, affective flattening, and diminished social interaction. Cognitive deficits can be assessed in rodent models of attention (prepulse inhibition) and of learning/memory (object and social recognition, Morris water maze and operant-delayed alternation). The relevance of the conditioned avoidance response is also discussed. A final section reviews procedures for assessing EPS liability, in particular, parkinsonism (catalepsy in rodents), acute dystonia (purposeless chewing in rodents, dystonia in monkeys), akathisia (defecation in rodents), and tardive dyskinesia (long-term antipsychotic treatment in rodents and monkeys). It is concluded that, with notable exceptions (attention, learning/memory, EPS liability), current predictive models for antipsychotics fall short of clear translational validity.

UI MeSH Term Description Entries
D011618 Psychotic Disorders Disorders in which there is a loss of ego boundaries or a gross impairment in reality testing with delusions or prominent hallucinations. (From DSM-IV, 1994) Psychoses,Psychosis, Brief Reactive,Schizoaffective Disorder,Schizophreniform Disorders,Psychosis,Brief Reactive Psychoses,Brief Reactive Psychosis,Disorder, Psychotic,Disorder, Schizoaffective,Disorder, Schizophreniform,Disorders, Psychotic,Disorders, Schizoaffective,Disorders, Schizophreniform,Psychoses, Brief Reactive,Psychotic Disorder,Reactive Psychoses, Brief,Reactive Psychosis, Brief,Schizoaffective Disorders,Schizophreniform Disorder
D003072 Cognition Disorders Disorders characterized by disturbances in mental processes related to learning, thinking, reasoning, and judgment. Overinclusion,Disorder, Cognition,Disorders, Cognition
D004409 Dyskinesia, Drug-Induced Abnormal movements, including HYPERKINESIS; HYPOKINESIA; TREMOR; and DYSTONIA, associated with the use of certain medications or drugs. Muscles of the face, trunk, neck, and extremities are most commonly affected. Tardive dyskinesia refers to abnormal hyperkinetic movements of the muscles of the face, tongue, and neck associated with the use of neuroleptic agents (see ANTIPSYCHOTIC AGENTS). (Adams et al., Principles of Neurology, 6th ed, p1199) Dyskinesia, Medication-Induced,Medication-Induced Dyskinesia,Drug-Induced Dyskinesia,Drug-Induced Dyskinesias,Dyskinesia, Drug Induced,Dyskinesia, Medication Induced,Dyskinesias, Drug-Induced,Dyskinesias, Medication-Induced,Medication Induced Dyskinesia,Medication-Induced Dyskinesias
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001519 Behavior The observable response of a man or animal to a situation. Acceptance Process,Acceptance Processes,Behaviors,Process, Acceptance,Processes, Acceptance
D001522 Behavior, Animal The observable response an animal makes to any situation. Autotomy Animal,Animal Behavior,Animal Behaviors
D014150 Antipsychotic Agents Agents that control agitated psychotic behavior, alleviate acute psychotic states, reduce psychotic symptoms, and exert a quieting effect. They are used in SCHIZOPHRENIA; senile dementia; transient psychosis following surgery; or MYOCARDIAL INFARCTION; etc. These drugs are often referred to as neuroleptics alluding to the tendency to produce neurological side effects, but not all antipsychotics are likely to produce such effects. Many of these drugs may also be effective against nausea, emesis, and pruritus. Antipsychotic,Antipsychotic Agent,Antipsychotic Drug,Antipsychotic Medication,Major Tranquilizer,Neuroleptic,Neuroleptic Agent,Neuroleptic Drug,Neuroleptics,Tranquilizing Agents, Major,Antipsychotic Drugs,Antipsychotic Effect,Antipsychotic Effects,Antipsychotics,Major Tranquilizers,Neuroleptic Agents,Neuroleptic Drugs,Tranquillizing Agents, Major,Agent, Antipsychotic,Agent, Neuroleptic,Drug, Antipsychotic,Drug, Neuroleptic,Effect, Antipsychotic,Major Tranquilizing Agents,Major Tranquillizing Agents,Medication, Antipsychotic,Tranquilizer, Major
D055808 Drug Discovery The process of finding chemicals for potential therapeutic use. Drug Prospecting,Discovery, Drug,Prospecting, Drug

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