National Repository of Grey Literature 44 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Motor development after repeated dosing of AMPA receptors antagonist in laboratory rats
Hanzalová, Jitka ; Mareš, Pavel (advisor) ; Valeš, Karel (referee)
Substance IEM 1460 is an antagonist of AMPA receptors in the brain. It is a derivative of adamantine, which has already been tested in several studies as a potential age-related anticonvulsant. In the research part of the thesis there is a summary of the knowledge about receptors, focusing on AMPA receptors, IEM 1460, epilepsy and ontogenetic development of laboratory rat. The research section evaluates the effect of IEM 1460 on motor skills of a rat in a few postnatal days of its life. To evaluate spontaneous animal motor skills, Open-Field tracking was used, and several specific tests were used to evaluate provoked motor skills. A total of 30 animals were included in the research. Substances (IEM 1460 at 3 mg / kg, IEM 1460 at 10 mg / kg or 2 ml / kg saline) were infused intraperitoneally on five consecutive days (ages P7-P11) and the animals were repeatedly tested at age 12, 15, 18, 21, 25, 31 and 60 days. In this study, IEM 1460 has not been shown to have significant effect on the gross rat motor skills and therefore the substance remains as a serious candidate for age-specific antiepileptic drugs.
G peoteins and adenylyl cyclase during onhogenetic development of rat brain cortex
Stohr, Jiří ; Svoboda, Petr (advisor) ; Langmeier, Miloš (referee) ; Mareš, Pavel (referee)
CONCLUSIONS our measurementsof agonist.stimulatedhigh-affiniý GTPase activiý and GTftS binding in thedevelopingrat brain cortexhaverevealeda markedlyhigherfunctionalactivity of GTP.binďng proteins in adult (9O{ay.old) than in immaturate(12day.o1d) ťaB.This study further demonsbatesthat RGSI, by contrast to RGSI6, might function as srong regulatorofhigh-afiiniý GTPase activity in this tissue. AC activity is regulatedsimilarly in brain cortex from immaturateand adult rats,but theenzymeactivity is much lower in adultthanin immaturateanimals.As arguedpreviously, the ďfference betweenAc actiúty in thesetwo agegroups is not explicable on the basis of the dwelopmental expressionprofiles of either ACl, ACz, AC4 and AC6 or ďfferent G proteins(Ihnatorrychet a1.,2@2a;Ihnatov.vchetal.,2002b).Itmightbe speculated,however, that the complement of some other types of AC could gg slanged in adulthood. This supposition is supportedby our recent finding of altered characteristicsof [3H]forskolin binding in cerebrocorticalmembranesfrom adult comparedto imÍraturaterats (Stóhr et al., 2005b)-Nevertheless,a possibilitycan not be ruled out thatAC activityin adultrat brain cortex might be perhaps affected by some yet not known negative regulatory factor/mechanism,which is switchedon shortlyaftermaturation. That high-afÍiniý as well...
Effect MTEP on immature rat behaviour.
Tichá, Kateřina ; Mareš, Pavel (advisor) ; Telenský, Petr (referee)
Metabotropic glutamate receptors represent prospective targets for anticonvulsant therapy of epilepsy. However there may be serious negative side effects. In this study the highly specific antagonist of mGluR5 was used - MTEP, [(2-methyl-1,3-thiazol-4-yl)ethynyl] pyridine, which was shown previously to have an anticonvulsant action. Our study was aimed at other possible effects, such as efficacy in motor skills, spontaneous behaviour, space learning and rate of anxiety. Animals, immature male Wistar rats (12, 18 and 25 days old), were pretreated with MTEP in two different doses - 20mg/kg and 40mg/kg, because MTEP demonstrated anticonvulsant activity in exactly such high doses. Animals were tested 15 min, 60 min and 24h (in elevated plus maze test only) after treatement. No negative effects were found in motor tests;, space learning in elevated plus maze was also not compromised. On the other hand, MTEP influenced frequency of some types of stereotypic behaviour in the open field test. MTEP exhibited anxiolytic-like effect in elevated plus maze in immature rats; this side effect has to be taken as a positive one. Powered by TCPDF (www.tcpdf.org)
Assessment of the impact of phenytoin on motor activity development of laboratory rats by motor activity testing and swimming analysis
Matoušková, Kateřina ; Mareš, Pavel (advisor) ; Valeš, Karel (referee)
Phenytoin is well-known antiepileptic drug with high anticonvulsant effect but also with proven side effects on motor activities associated with its long-term use. This thesis summarizes side effects of phenytoin on motor skills and coordination of rats after acute phenytoin treatment. Theoretical part includes proven effects of phenytoin on human and animal model. Knowledge about motor skills development of rats and comparison with human motor skills development is also included in the thesis. Apart from locomotion development, swimming development is also described. We compared three groups of rats in the experiment. Each group consisted of ten rats. We compared group with dosage 60 mg/kg, 30 mg/kg, control group and vehicle group. Each group was tested before application for control. We tested animals on postnatal day 12, 18 and 25. Effects of phenytoin were evaluated by motor skills testing and swimming analyses. The results of this thesis have proved impaired motor skills and coordination after phenytoin treatment of 12 and 25 days old rats.
Sport - speed paintball
Mareš, Pavel ; Fiala, Miloš (advisor) ; Opelka, Luboš (referee)
Title: Sport/speed paintball Objectives: To Introduce the readers to competitive paintball and its basic set of rules Methods: Available materials regarding this topic were used Results: Overview of competitive paintball, its history, description of equipment, set of rules and ballistic parameters of a paintball marker Keyworlds: sport, population, safe, ballistics, training
Development of callosal interhemispheric connection in laboratory rat
Matternová, Lucie ; Mareš, Pavel (advisor) ; Žiak, Jakub (referee)
Corpus callosum is the main commissure linking cortex of the right and left brain hemisphere. For the first time, the callosal axons are observed during E18, when they cross the midline. In PND 5, most axons reach the contralateral cortex, and at the end of the second postnatal week, the callosal projection neurons and axon terminals are located similarly to the adult animal. The interhemispheric response was first observed in the rat in PND 4 but myelination in PND 12, suggesting that the transcallosal response is not dependent on myelinization of callosal fibers. As the rat age increases, the wave duration of the TCR, latency peak and threshold decreases. As opposed to that, amplitude of the positive and negative wave increases with age. TCR may be affected by acute drug application or chronic exposure to various effects, such as hormones.
Circadian clock in hippocampus
Šuchmanová, Karolína ; Sumová, Alena (advisor) ; Mareš, Pavel (referee)
Hippocampus is one of the main components of the limbic system. It plays an important role in the process of memory formation and recent literature shows that, like in other peripheral organs and brain structures, there is a circadian clock present in the hippocampus. The aim of the thesis was to study the hippocampal circadian clock under various conditions. The first part of the thesis examines the influence of glucocorticoid hormones on the clock gene expression in the hippocampus. Glucocorticoids are mammalian steroid hormones secreted from the adrenal glands that affect many processes in the organism. The glucocorticoid secretion is under the control of the circadian system, causing their levels to exhibit a pronounced diurnal rhythm. The hippocampus provides feedback to the hypothalamo-pituitary-adrenal (HPA) axis and is thus involved in the regulation of glucocorticoid hormone secretion. Hippocampal neurons also express glucocorticoid hormone receptors (GR). This thesis explores the effect of the absence of glucocorticoid hormones on the clock gene expression in the hippocampus. The absence of glucocorticoids was due to adrenalectomy and its effect was further compared with the effect of endogenous glucocorticoid replacement by daily injections of the GR agonist dexamethasone, emulating...
Developmental changes in expression levels of the chosen subunits of NMDA and AMPA receptors and action of their antagonists on physiological and epileptic phenomena
Szczurowska, Ewa Katarzyna ; Mareš, Pavel (advisor) ; Rokyta, Richard (referee) ; Bendová, Zdeňka (referee)
During early stages of postnatal development, glutamate receptors of NMDA and AMPA type, undergo intensive functional changes due to modifications of their subunit composition (Pachernegg et al., 2012: Paoletti et al., 2013). The NR2B-containing NMDARs (NR2B/NMDARs) and GluA2-lacking AMPARs (Ca 2+ -permeable) that are highly expressed in immature brain, are implicated in increased excitability, seizures generation, excitotoxicity, and neuronal death (Vizi et al., 2013). Pharmacological blockade of these types of receptors by their specific antagonists, can exhibit anticonvulsant effects at early stages of postnatal development. Therefore, we tested the influence of the IEM1460, a specific antagonist of Ca 2+ -permeable AMPARs and the Ro 25-6981 maleate, a highly selective and activity-dependent antagonist of NR2B/NMDARs on physiological excitability and epileptic phenomena induced in immature rats. Anticonvulsant action of IEM1460 was tested in two models of epileptic seizures: pentylenetetrazol (PTZ)- induced convulsions and cortical afterdischarges (ADs), induced in animals at P12, P18 and P25. Our results indicate that the effects of IEM1460 on various types of seizures depend on their sites of origin in the brain, developmental stage, and GluA2 subunit expression profile. To clarify the action...

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