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Involvement of Cholinergic Receptors in the Different Stages of Memory

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Involvement of Cholinergic Receptors in the Different Stages of Memory Pharmacological Reports Copyright © 2012 2012, 64, 10661080 by Institute of Pharmacology ISSN 1734-1140 Polish Academy of Sciences Involvementofcholinergicreceptors inthedifferentstagesofmemorymeasured inthemodifiedelevatedplusmazetestinmice MartaKruk-S³omka,BarbaraBudzyñska,Gra¿ynaBia³a Chair, Department of Pharmacology and Pharmacodynamics, Medical University of Lublin, Chodki 4A, PL 20-093 Lublin, Poland Correspondence: Marta Kruk-S³omka, e-mail: [email protected] Abstract: Background and Methods: Several lines of evidence support a strong relationship between cholinergic pathways and memory. The aim of our experiments was to examine the mechanisms involved in the formation of different memory stages, to evaluate the impact of substances, which affect the cholinergic system in mice, with an employment of the modified elevated plus maze (mEPM) test. This test allows examining different processes of memory (acquisition, consolidation and retrieval), depending on the time of drug treatment. The time period, necessary for mice to move from the opened arm to the enclosed arm (i.e., transfer latency, TL) was used asanindexofmemory. Results: Our findings revealed that in both memory acquisition and consolidation, nicotine, an agonist of cholinergic receptors (0.035 and 0.175 mg/kg, free base, sc), reduced TL on the second day of the experiment (TL2), thus improving memory. In turn, sco- polamine, an antagonist of cholinergic receptors (0.3 and 1.0 mg/kg, ip), significantly increased TL2 values, impairing cognition. Subsequently, we evaluated the influence of mecamylamine, a non-selective antagonist of nicotinic cholinergic receptors (nAChRs) and of varenicline, an a4b2 partial nAChRs agonist, on memory-related behaviors induced by nicotine and scopolamine. Acute injections of mecamylamine (0.5 and 1.0 mg/kg, ip) and varenicline (0.5 and 1.0 mg/kg, ip), prior to the injections of nicotine (0.035 mg/kg) or scopolamine (1.0 mg/kg), significantly suppressed nicotine-induced memory improvement or scopolamine- inducedmemoryimpairment. Conclusion: Our studies indicate that the cholinergic system plays a crucial role in memory processes. Pharmacological manipula- tion of cholinergic transmission can be the base to develop more effective pharmacotherapies for these memory disturbances in whichcholinergicreceptorsareinvolved. Keywords: nicotine,scopolamine,mecamylamine,varenicline,memoryandlearning,modifiedelevatedplusmaze Abbreviations: ACh – acetylcholine, AD – Alzheimer’s dis- Introduction ease, DA – dopamine, GABA – g-aminobutyric acid, mAChRs – muscarinic cholinergic receptors, mEPM – modified elevated plus maze, nAChRs – nicotinic cholinergic receptors, NMDA – A fair number of studies imply some role of the cho- N-methyl-D-aspartate, TL – transfer latency, VTA – ventral linergic system in cognitive functions, specifically in tegmentalarea attention and memory encoding. Spatial memory is one 1066 Pharmacological Reports, 2012, 64, 10661080 Cholinergicreceptorsindifferentstagesofmemory Marta Kruk-S³omka et al. of the most essential forms of higher cognitive pro- is essential for working memory-related responses, cesses, demanding a certain capacity to record environ- measuredintheradialarmmazetestinrats[2,3,37]. mental and spatial orientation data. Thus, spatial mem- An abnormally regulated cholinergic system, with ory formation represents a simple form of episodic-like a decline of cholinergic neurons in the basal forebrain, memory in rodents that engages both the basal cho- have been hypothesized as being responsible for the linergic system and its target structures [17, 18, 24]. cognitive symptoms of neuropsychiatric disorders, It is known that acetylcholine (ACh) is a neuro- e.g., Alzheimer’s disease (AD) [18, 32]. The first transmitter essential for these cognitive functions. clinical trials in patients, suffering from AD, revealed Previous studies concluded a strong correlation be- no changes in the number, the structure or the func- tween synaptic ACh levels and cognitive function im- tion of mAChRs, while significantly decreased levels provement, providing evidence that acetylcholinester- of a4b2 nAChRs subtypes were observed, especially ase (an ACh breaking down enzyme), lead to in- in the cortex and the hippocampus [18, 29, 32, 41]. creased ACh levels in the brain, especially in cortical That reported decline may be appropriate for the cog- and hippocampal brain regions, i.e., the two major ar- nitive deficits that characterize the condition. There- eas involved in cognitive processes. Accordingly, fore, an administration of drugs, which improve cho- many acetylcholinesterase inhibitors improve per- linergic signaling, is able to enhance cognitive func- formance levels in several cognitive models, involv- tions [29, 43]. What is more, literature data suggest inghumansorrodents[34]. that agonists and partial agonists of various subtypes Muscarinic (mAChRs) and nicotinic (nAChRs) of nAChRs are probably an interesting therapeutic receptors, i.e., the two main classes of cholinergic target for the treatment of various central nervous sys- receptors that mediate ACh actions and play a crucial temdisorders,suchasAD[2,29,43]. role in memory processing, are localized in the human Based on the above-mentioned data, much effort brain [32, 64]. Out of them, it is the nAChRs which has been undertaken toward investigating memory- are mainly involved in memory processes. The char- related effects of the two cholinergic system affecting acteristic structure of nAChRs includes a ring of five substances (nicotine and scopolamine) in mice. Addi- subunits, arranged around a ligand-gated excitatory tionally, assuming the reported data that a4b2 and a7 ion channel. To date, 12 individual subunits of ligands may represent a new generation of com- nAChRs (a2–a10) and (b2–b4) have been identified. pounds to treat memory disorders, such as AD, we The two main neuronal categories, defined by their aimed to investigate and compare the influences, function and pharmacology, include heterologous exerted on the memory and learning processes in pentamers, formed from the combinations of a- and mice, by mecamylamine, a non-selective nicotinic re- b-subunits, and homologous pentamers, formed from ceptor antagonist, and by varenicline, a partial a4b2 one subunit type, a7, a8 or a9 [13, 58]. Out of all the nAChR agonist, which has recently been approved as central nAChRs subtypes, both the a4b2 combination a pharmacological aid to cease the smoking habit [14, and a7 subunits seem to play the most important role 33]. In our experiments, we used the recently devel- in memory-related responses [35]. A growing body of oped modified elevated plus maze (mEPM) memory evidence reveals a certain involvement of the a4b2 animal model. The mEPM test is a simple method that subtype of nAChRs in cognitive processing [49]. Fur- evaluates spatial memory and, moreover, this memory thermore, metanicotine, a selective a4b2 nAChRs model allows investigating different stages of mem- agonist, enhances reference and working memory in ory processes [30, 31, 54, 70]. We wanted to ascertain the radial arm maze performance in rats with ibotenic whether memory acquisition or consolidation pro- acid forebrain lesions and also improves passive cesseswerebythosedrugsinanywayaffected. avoidance retention in rats with scopolamine-induced The experiments may contribute to a better under- amnesia [44, 45]. Consistent with the role of a7 standing of the cholinergic neuronal mechanisms, im- nAChRs in cognition, some deficits in olfactory portant for the modulation of memory and learning working memory were also revealed in a7 knockout processes. The knowledge about the mechanisms of mice vs. wild-type controls [75]. Additionally, another action of cholinergic ligands (not only mecamylamine research with the use of methyllycaconitine, a specific and varenicline) enables a development of more ef- antagonist of a7 nAChRs, infused into the ventral fective pharmacotherapies for human memory disor- hippocampus, demonstrates that this type of nAChRs dersassociatedwithcholinergicpathways. Pharmacological Reports, 2012, 64, 10661080 1067 MaterialsandMethods arms (5 × 30 × 15 cm), opposite to each other. The whole apparatus was made of dark Plexiglas and ele- vated to the height of 50 cm above the floor. Addition- Animals ally, the mEPM test was conducted under red, dim light. The mEPM test has a spatial component. The prin- Experiments were carried out on naive male Swiss ciple of this test is based upon the aversion of rodents mice (Farm of Laboratory Animals, Warszawa, Po- to open spaces and heights. The animals prefer en- land) weighing 20–30 g. The animals were maintained closed, protected areas of the maze and they must re- under standard laboratory conditions (12-h light/dark membertheconfigurationofopenandenclosedarms. cycle, room temperature 21 ± 1°C) with free access to The mice were individually placed at the end of the tap water and laboratory chow (Bacutil, Motycz, Po- open arm, facing away from the central platform. Each land) in their home cages, and were adapted to the group was twice submitted to the same procedure (with laboratory conditions for at least one week. Each ex- a 24 h interval between trials). During the first trial perimental group consisted of 7–10 animals. All be- (pretest), the time that each mouse took to move from havioral experiments were performed between 8:00 the open arm to either of the enclosed arms was re- and 15:00 h, being conducted, according to the
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