567515

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567515 [2018/11/22 21:16] (current)
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 +====== Contralateral turning evoked by the intranigral microinjection of muscimol and other GABA agonists.======
 +
 +** Article date:** 1978/10/27
 +~~META:date created = 1978-10-27~~
 +
 +** PubMed ID: 567515 **
 +
 +** Journal name: Brain research (ISSN: 0006-8993) **
 +
 +** ABSTRACT **
 +
 +Contraversive turning was evoked by the microinjection of GABAergic agents into the substantia nigra (SN) of the rat. Muscimol, the most potent GABA agonist, evoked contralateral turning when injected into the SN in doses of 0.005, 0.05, 0.5 and 5 microgram, whereas 0.5 microgram of muscimol applied at extranigral sites produced no turning. A shorter lived contraversive turning response was evoked by the intranigral micro-injection of imidazole acetic acid (10 or 50 microgram), ethanolamine-O-sulphate (25 or 50 microgram), or GABA (50 microgram). No increase in GABA-induced turning was produced by local pretreatment with pipecolic acid (5 microgram). When injected into the SN, neither picrotoxin, in doses of 0.1, 0.5, 1.0 or 2.0 microgram, nor bicuculline methiodide (Bm), in doses of 0.1 or 0.2 microgram, elicited a significant amount of turning. Picrotoxin, however, partially blocked the turning evoked by the intranigral injection of muscimol, both via the i.p. and intranigral routes of administration whereas Bm did not. In addition, haloperidol (1 mg/kg i.p.) antagonized the muscimol-induced turning. Hence, we feel GABA mimetic substances injected within the SN might evoke contralateral turning via activation of a heretofore undescribed neural system arising from the SN or by activating the ipsilateral dopaminergic neurons projecting from the SN.
 +
 +===== ===== 
 +
 +{{gview 100%,​450px>​ http://​directlinks.cc/​files/​muscimol/​567515.pdf}}
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 +Author List: Martin G E, Papp N L, Bacino C B
 +
 +Publication Types: Journal Article
 +
 +Substances mentioned in the article: Dopamine Antagonists;​ Ethanolamines;​ GABA Antagonists;​ Imidazoles; Oxazoles; Picrotoxin; Muscimol; gamma-Aminobutyric Acid; 
 +
 +Mesh terms: Animals; Behavior/​drug effects; Caudate Nucleus/​drug effects; Dopamine Antagonists;​ Dose-Response Relationship,​ Drug; Ethanolamines/​pharmacology;​ Female; GABA Antagonists;​ Humans; Imidazoles/​pharmacology;​ Muscimol/​antagonists & inhibitors; Oxazoles/​pharmacology;​ Picrotoxin/​pharmacology;​ Putamen/​drug effects; Rats; Stereotyped Behavior/​drug effects; Substantia Nigra/drug effects; gamma-Aminobutyric Acid/​administration & dosage; ​
 +
 +{{tag> Imidazoles GABA_Antagonists Ethanolamines gamma-Aminobutyric_Acid Picrotoxin Dopamine_Antagonists Muscimol Oxazoles }}
 +
 +{{keywords>​ Imidazoles, GABA Antagonists,​ Ethanolamines,​ gamma-Aminobutyric Acid, Picrotoxin, Dopamine Antagonists,​ Muscimol, Oxazoles}}
 +
  
567515.txt · Last modified: 2018/11/22 21:16 (external edit)