Valeriana officinalis does not alter the orofacial dyskinesia induced by haloperidol in rats: role of dopamine transporter.
Chronic treatment with classical neuroleptics in humans can produce a serious side effect, known as tardive dyskinesia (TD). Here, we examined the effects of V. officinalis, a medicinal herb widely used as calming and sleep-promoting, in an animal model of orofacial dyskinesia (OD) induced by long-term treatment with haloperidol. Adult male rats were treated during 12 weeks with haloperidol decanoate (38 mg/kg, i.m., each 28 days) and with V. officinalis (in the drinking water). Vacuous chewing movements (VCMs), locomotor activity and plus maze performance were evaluated. Haloperidol treatment produced VCM in 40% of the treated rats and the concomitant treatment with V. officinalis did not alter either prevalence or intensity of VCMs. The treatment with V. officinalis increased the percentage of the time spent on open arm and the number of entries into open arm in the plus maze test. Furthermore, the treatment with haloperidol and/or V. officinalis decreased the locomotor activity in the open field test. We did not find any difference among the groups when oxidative stress parameters were evaluated. Haloperidol treatment significantly decreased [(3)H]-dopamine uptake in striatal slices and V. officinalis was not able to prevent this effect. Taken together, our data suggest a mechanism involving the reduction of dopamine transport in the maintenance of chronic VCMs in rats. Furthermore, chronic treatment with V. officinalis seems not produce any oxidative damage to central nervous system (CNS), but it also seems to be devoid of action to prevent VCM, at least in the dose used in this study.
Departamento de Química, Programa de Pós-Graduação em Bioquímica Toxicológica, Universidade Federal de Santa Maria, RS, Brazil. roseleifachinetto@yahoo.com
Roselei
R
Fachinetto
Jardel G
JG
Villarinho
Caroline
C
Wagner
Romaiana P
RP
Pereira
Daiana Silva
DS
Avila
Marilise E
ME
Burger
João Batista
JB
Calixto
João B T
JB
Rocha
Juliano
J
Ferreira
D000818:Animals; D014150:Antipsychotic Agents / Q000633:toxicity*; D001007:Anxiety / Q000523:psychology; D001522:Behavior, Animal / Q000187:drug effects; D001923:Brain Chemistry / Q000187:drug effects; D004298:Dopamine / Q000378:metabolism; D018492:Dopamine Antagonists / Q000633:toxicity*; D050483:Dopamine Plasma Membrane Transport Proteins / Q000502:physiology*; D006220:Haloperidol / Q000633:toxicity*; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D009069:Movement Disorders / Q000188:drug therapy*; D018384:Oxidative Stress / Q000187:drug effects; D010936:Plant Extracts / Q000627:therapeutic use; D051381:Rats; D017208:Rats, Wistar; D014632:Valerian / Q000737:chemistry*
D014150:Antipsychotic Agents; D018492:Dopamine Antagonists; D050483:Dopamine Plasma Membrane Transport Proteins; D010936:Plant Extracts; D006220:Haloperidol; D004298:Dopamine