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Effects of stimulatory and depressant drugs on cyclic guanosine 3',5'-monophosphate and adenosine 3',5'-monophosphate levels in mouse brain. 1976

F A Opmeer, and S W Gumulka, and V Dinnedahl, and P S Schönhöfer

Cyclic GMP levels were dose-dependently increased by excitatory drugs such as picrotoxin, pentetrazol, oxotremorine and harmaline in mouse cerebellum and medial forebrain (parts of the cortex, hippocampus, hypothalamus, thalamus, striatum and midbrain) in vivo. Cyclic AMP levels remained unchanged under these conditions. Pretreatment with diazepam completely abolished the effect of picrotoxin and harmaline and significantly reduced the effects of pentetrazol and oxotremorine on cyclic GMP levels, but the tremor due to harmaline and oxotremorine was not blocked. Pretreatment with pentobarbital also prevented or strongly reduced changes in cyclic GMP levels elicited by excitatory drugs without abolishing the tremorigenic effects of harmaline and oxotremorine. Pretreatment with atropine was only effective in blocking cyclic GMP rise and tremor induced by oxotremorine and picrotoxin. Since pentobarbital and diazepam also decreased cyclic GMP levels in a dose-dependent manner in brains of control animals, the changes in cyclic GMP levels observed after administration of excitatory drugs appear to be related to the arousal reaction of the central nervous system.

UI MeSH Term Description Entries
D008297 Male Males
D010095 Oxotremorine A non-hydrolyzed muscarinic agonist used as a research tool. Oxytremorine
D010424 Pentobarbital A short-acting barbiturate that is effective as a sedative and hypnotic (but not as an anti-anxiety) agent and is usually given orally. It is prescribed more frequently for sleep induction than for sedation but, like similar agents, may lose its effectiveness by the second week of continued administration. (From AMA Drug Evaluations Annual, 1994, p236) Mebubarbital,Mebumal,Diabutal,Etaminal,Ethaminal,Nembutal,Pentobarbital Sodium,Pentobarbital, Monosodium Salt,Pentobarbitone,Sagatal,Monosodium Salt Pentobarbital
D010433 Pentylenetetrazole A pharmaceutical agent that displays activity as a central nervous system and respiratory stimulant. It is considered a non-competitive GAMMA-AMINOBUTYRIC ACID antagonist. Pentylenetetrazole has been used experimentally to study seizure phenomenon and to identify pharmaceuticals that may control seizure susceptibility. Leptazole,Pentamethylenetetrazole,Pentetrazole,Cardiazol,Corasol,Corazol,Corazole,Korazol,Korazole,Metrazol,Metrazole,Pentazol,Pentylenetetrazol
D010852 Picrotoxin A mixture of PICROTOXININ and PICROTIN that is a noncompetitive antagonist at GABA-A receptors acting as a convulsant. Picrotoxin blocks the GAMMA-AMINOBUTYRIC ACID-activated chloride ionophore. Although it is most often used as a research tool, it has been used as a CNS stimulant and an antidote in poisoning by CNS depressants, especially the barbiturates. 3,6-Methano-8H-1,5,7-trioxacyclopenta(ij)cycloprop(a)azulene-4,8(3H)-dione, hexahydro-2a-hydroxy-9-(1-hydroxy-1-methylethyl)-8b-methyl-, (1aR-(1aalpha,2abeta,3beta,6beta,6abeta,8aS*,8bbeta,9S*))-, compd. with (1aR-(1aalpha,2abeta,3beta,6beta,6abeta,8,Cocculin
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D001923 Brain Chemistry Changes in the amounts of various chemicals (neurotransmitters, receptors, enzymes, and other metabolites) specific to the area of the central nervous system contained within the head. These are monitored over time, during sensory stimulation, or under different disease states. Chemistry, Brain,Brain Chemistries,Chemistries, Brain
D003292 Convulsants Substances that act in the brain stem or spinal cord to produce tonic or clonic convulsions, often by removing normal inhibitory tone. They were formerly used to stimulate respiration or as antidotes to barbiturate overdose. They are now most commonly used as experimental tools. Convulsant,Convulsant Effect,Convulsant Effects,Effect, Convulsant,Effects, Convulsant
D003975 Diazepam A benzodiazepine with anticonvulsant, anxiolytic, sedative, muscle relaxant, and amnesic properties and a long duration of action. Its actions are mediated by enhancement of GAMMA-AMINOBUTYRIC ACID activity. 7-Chloro-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one,Apaurin,Diazemuls,Faustan,Relanium,Seduxen,Sibazon,Stesolid,Valium
D004347 Drug Interactions The action of a drug that may affect the activity, metabolism, or toxicity of another drug. Drug Interaction,Interaction, Drug,Interactions, Drug

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