The striopallidal pathway is involved in antiparkinsonian-like effects of the blockade of group I metabotropic glutamate receptors in rats.
The aim of the study was to examine the influence of the blockade of group I metabotropic glutamate receptors (mGluRs) on the haloperidol-induced catalepsy and proenkephalin mRNA expression in the rat striatum. Bilateral, intrastriatal injection of AIDA ((RS)-1-aminoindan-1,5-dicarboxylic acid, 3-15 microg/0.5 microl), a selective antagonist of group I mGluRs, inhibited catalepsy induced by haloperidol (0.5 mg/kg i.p.). Repeated intrastriatal AIDA administrations (3 x 15 microg/0.5 microl, 3 h apart) counteracted the haloperidol-induced (3 x 1.5 mg/kg s.c., 3 h apart) increase in the proenkephalin mRNA expression in that structure. The present study indicates that the blockade of the striatal group I mGluRs may inhibit parkinsonian akinesia by normalizing the function of the striopallidal pathway.
Department of Neuro-Psychopharmacology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna St., 31-343, Kraków, Poland. ossowska@if-pan.krakow.pl
Krystyna
K
Ossowska
Jadwiga
J
Wardas
Małgorzata
M
Pietraszek
Jolanta
J
Konieczny
Stanisław
S
Wolfarth
D000818:Animals; D002385:Cataplexy / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism*; D003342:Corpus Striatum / Q000187:drug effects / Q000378:metabolism*; D018492:Dopamine Antagonists; D004745:Enkephalins / Q000187:drug effects / Q000378:metabolism*; D005917:Globus Pallidus / Q000187:drug effects / Q000378:metabolism*; D006220:Haloperidol; D008297:Male; D009434:Neural Pathways / Q000378:metabolism; D010300:Parkinson Disease / Q000378:metabolism; D011498:Protein Precursors / Q000187:drug effects / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D018094:Receptors, Metabotropic Glutamate / Q000037:antagonists & inhibitors* / Q000378:metabolism
D018492:Dopamine Antagonists; D004745:Enkephalins; D011498:Protein Precursors; D012333:RNA, Messenger; D018094:Receptors, Metabotropic Glutamate; C104077:metabotropic glutamate receptor type 1; C029992:proenkephalin; D006220:Haloperidol