Intra-nigral MPTP lesion in rats: behavioral and autoradiography studies.
The present study investigated the motor response and possible changes in binding to D1 and D2 receptors after intra-nigral 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) infusion on rats. The results indicated that MPTP-lesioned rats exhibited a significant reduction in locomotion and rearing frequencies observed in an open field 24 h after surgery. However, at 7 and 14 days after surgery the MPTP-lesioned rats showed a significant increase in locomotion in comparison to the control groups, as well as a decrease in immobility time. In addition, 21 days after surgery the behavioral measurements were unaltered by these procedures. Moreover, latency in initiating movement and catalepsy were unchanged by this neurotoxin on the same days of observation. An autoradiography approach indicated that there was a reduction in [3H]SCH 23390 binding in substantia nigra pars compacta (SNpc), substantia nigra pars reticulata (SNpr) and ventrolateral striatum in MPTP-treated rats 21 days after the surgery. [3H]raclopride binding remained unaltered by the MPTP treatment. These results suggest that compensatory plastic changes occur in D1 dopamine receptors after partial lesion of nigral dopaminergic neurons. These alterations might be related to the occurrence and recovery of motor impairment observed in MPTP-lesioned rats.
Perry
Juliana C
JC
Universidade Federal do Paraná, Setor de Ciências Biológicas, Departamento de Farmacologia, Av. Francisco H. dos Santos s/n, CEP: 81.531-990, Caixa Postal: 19031, Curitiba-Paraná, Brazil.
Hipólide
Débora C
DC
Tufik
Sergio
S
Martins
Ronan D
RD
Da Cunha
Cláudio
C
Andreatini
Roberto
R
Vital
Maria Aparecida B F
MA
D000704:Analysis of Variance; D000818:Animals; D001345:Autoradiography; D001522:Behavior, Animal / Q000187:drug effects*; D001552:Benzazepines / Q000493:pharmacokinetics; D002375:Catalepsy / Q000503:physiopathology; D018492:Dopamine Antagonists / Q000493:pharmacokinetics; D005106:Exploratory Behavior / Q000187:drug effects; D020267:MPTP Poisoning / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008297:Male; D009043:Motor Activity / Q000187:drug effects / Q000502:physiology; D011859:Radiography; D051381:Rats; D017208:Rats, Wistar; D018709:Statistics, Nonparametric; D013378:Substantia Nigra / Q000000981:diagnostic imaging* / Q000473:pathology; D013997:Time Factors; D014316:Tritium / Q000493:pharmacokinetics
D001552:Benzazepines; D018492:Dopamine Antagonists; D014316:Tritium