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Learn Mem ; 21(2): 82-9, 2014 Jan 16.
Artigo em Inglês | MEDLINE | ID: mdl-24434869

RESUMO

Methylphenidate (MPH), introduced more than 60 years ago, accounts for two-thirds of current prescriptions for attention deficit hyperactivity disorder (ADHD). Although many studies have modeled MPH's effect on executive function, almost none have directly modeled its effect on long-term memory (LTM), even though improvement in LTM is a critical target of therapeutic intervention in ADHD. We examined the effects of a wide range of doses of MPH (0.01-10 mg/kg, i.p.) on Pavlovian fear learning, a leading model of memory. MPH's effects were then compared to those of atomoxetine (0.1-10 mg/kg, i.p.), bupropion (0.5-20 mg/kg, i.p.), and citalopram (0.01-10 mg/kg, i.p.). At low, clinically relevant doses, MPH enhanced fear memory; at high doses it impaired memory. MPH's memory-enhancing effects were not confounded by its effects on locomotion or anxiety. Further, MPH-induced memory enhancement seemed to require both dopamine and norepinephrine transporter inhibition. Finally, the addictive potential of MPH (1 mg/kg and 10 mg/kg) was compared to those of two other psychostimulants, amphetamine (0.005 mg/kg and 1.5 mg/kg) and cocaine (0.15 mg/kg and 15 mg/kg), using a conditioned place preference and behavioral sensitization paradigm. We found that memory-enhancing effects of psychostimulants observed at low doses are readily dissociable from their reinforcing and locomotor activating effects at high doses. Together, our data suggest that fear conditioning will be an especially fruitful platform for modeling the effects of psychostimulants on LTM in drug development.


Assuntos
Condicionamento Clássico/efeitos dos fármacos , Medo/efeitos dos fármacos , Memória de Longo Prazo/efeitos dos fármacos , Metilfenidato/farmacologia , Nootrópicos/farmacologia , Inibidores da Captação Adrenérgica/farmacologia , Anfetamina/farmacologia , Animais , Cloridrato de Atomoxetina , Bupropiona/farmacologia , Estimulantes do Sistema Nervoso Central/farmacologia , Citalopram/farmacologia , Cocaína/farmacologia , Relação Dose-Resposta a Droga , Feminino , Locomoção/efeitos dos fármacos , Masculino , Aprendizagem em Labirinto/efeitos dos fármacos , Camundongos , Camundongos Endogâmicos C57BL , Propilaminas/farmacologia , Reforço Psicológico , Inibidores Seletivos de Recaptação de Serotonina/farmacologia , Percepção Espacial/efeitos dos fármacos
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