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Poster Abstracts ADDICTIVE DISORDERS Poster Abstracts Monday 4th July 2016 PS: Displayed on Sunday 3rd July 2016 PM: Displayed on Monday 4th July 2016 PT: Displayed on Tuesday 5th July 2016 Sub-Topics by Disorder: Addictive Disorders: PM283 – PM333 Childhood & Adolescent Disorders: PM334 – PM357 Schizophrenia: PM358 – PM543 ADDICTIVE DISORDERS: Conclusions: Exogenously applied agmatine can prevent mor- phine-withdrawal-induced glial reactivity and c-fos. As an PM283 – PM333 endogenous molecule agmatine might be a part of compensa- tory mechanism within the reward pathway. Therefore further PM283 studies are required for better understanding the involving mechanisms in order to develop novel approaches for the mor- Agmatine prevents morphine-induced glial phine addiction strategies. activation in rats Feyza Aricioglu1, Aydın Sav2 1Marmara University, Faculty of Pharmacy, Department of PM284 Pharmacology and Psychopharmacology Research Unit, Istanbul Agmatine prevents learning and memory deficit 2Marmara University, Faculty of Medicine, Department of Pathology, in repeated morphine withdrawal: Is it via Istanbul glutamatergic system? Feyza Aricioglu1, Aydın Sav2 Abstract 1Marmara University, Faculty of Pharmacy, Department of Objectives: Opioid addiction is associated with long-term adap- Pharmacology and Psychopharmacology Research Unit, Istanbul tive changes in the brain that involve glial activation. Agmatine 2Marmara University, Faculty of Medicine, Department of Pathology, is an amine formed by the decarboxylation of l-arginine by Istanbul-Turkey the enzyme arginine decarboxylase. It binds to α2-adrenergic and imidazoline receptors, and selectively blocks N-methyl-D- Abstract aspartate receptors. Agmatine treatment was reported to have Objective: Morphine is important not only because it’s known various biological actions. It reduces tolerance to morphine as a most powerful analgesic but also with its potential for and attenuates behavioral signs of morphine in naloxone- addiction. Withdrawal syndrome which occurs with an absence induced abstinence syndrome in vitro and in. This study has of morphine is a condition that addicts suffer over and over been designed to evaluate the effect of agmatine on morphine- lifelong. We have previously showed that repeated withdrawal induced glial activation in rats. syndrome impaired learning-memory. Current study designed Methods: Male Wistar Albino rats (190–240 g) were divided into to evaluate possible effect of agmatine treatment on impaired three groups such as Control, Morphine and Morphine+Agmatine. learning-memory and if it is related with glutamatergic system. Morphine and Morphine+Agmatine groups were received two Material and Method: Wistar Albino rats were divided into morphine pellets containing 75 mg morphine base each that was groups such as Control, Morphine and Agmatine+Morphine implanted subcutaneously in the scapular area under light anes- (n=8 for each group) and subcutaneously implanted with two thesia. Morphine+Agmatine group received agmatine (40 mg/kg, pellets, 75 mg morphine base containing/each. 72 hours later i.p.) and the injection was repeated after 6 hours. 72 hours later naloxone 2 mg/kg i.p was injected to precipitate withdrawal syn- naloxone 2 mg/kg i.p was injected to precipitate withdrawal syn- drome, observed for 30 minutes. This procedure was repeated drome, observed for 30 minutes and withdrawal symptoms were by implanting one more pellet each time, repeated 6 times and recorded. Control group received placebo pellets and only saline waited for 3 weeks. Animals received 40 mg/kg agmatine twice injections in the same volume of agmatine. Immunohistochemistry daily. Animal were undertaken for Morris water maze and pas- was performed to investigate the expression of glial fibrillary acidic sive avoidance tests. Brains were used to evaluate glutamate protein (GFAP) as indicator of glial activity and c-fos. immunoreactivity. Results: Morphine withdrawal syndrome became more severe as it Results: Morphine withdrawal syndrome became more severe is repeated. When coadministered with morphine, agmatine signif- each time and learning-memory functions were impaired by icantly attenuated withdrawal symptoms. Immunohistochemistry repeating the syndrome. Agmatine treatment prevented learn- © The Author 2016. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: [email protected]. with GFAP revealed that agmatine significantly decreased mor- ing-memory deficits in Morris water maze and passive avoid- phine-induced over-expression of GFAP and c-fos. ance tests. In hematoxylin-eosin stained slices, dark eosinophilic 1 2 | International Journal of Neuropsychopharmacology, 2016 neurons with red stoplasma were denser in sectors than the Methods: Rats were trained in a touch screen chamber to learn other neurons. Glutamate immunopositivity has detected in the relationships between 4 different light signals on the screen hippocampal neurons, neuropil, habenular nuclei and cortical and accompanied reward outcomes and punishments set up tractus. Number of neurons were significantly less in morphine with different schedules, for one session of 30 min each day. group compaired to controls and there were no significant dif- Then, they were allowed for free choices out of 4 different light ference between control and agmatine treated groups. signals. Once animals showed a stabilized pattern of preference, Conclusion: According to the findings of the current study they were given 7 days of either saline or cocaine IP injections repeated morphine withdrawal syndrome can cause damage (a single injection per day) followed by 2 weeks of withdrawal. on learning-memory and glutamatergic system may play a role Then, their preference of choice was re-tested in rGT chambers. at least a part. Agmatine has a clear protective role on mem- Results: Depending upon their preference of choice, rats were ory functions. Further research is necessary to understand the separated as either risk-averse or risk-seeking groups. However, mechanism underlying. when they were exposed to cocaine, rats in the risk-averse group significantly changed their preference toward more disadvanta- PM285 geous choices. Conclusions: These results indicate that cocaine influences Neuropharmacological effect of ketamine- even different types of decision-making behavior as in gam- induced hyperlocomotion modulated by age in the bling task, which is not directly relevant with obtaining cocaine C57BL/6J mice itself, implying that they may aggravate pathological symptoms Yi-Chyan Chen M.D., Ph.D. of bad choices, resulting in negative consequences, observed in Department of Psychiatry, Taipei Tzu Chi Hospital, Buddhist Tzu Chi the patients with behavioral addictions. Medical Foundation, Taipei, Taiwan Keywords: pathological gambling, cocaine, decision making, Abstract behavioral addiction Background: Ketamine, an antagonist on N-methyl-D-aspartate (NMDA) receptor, can produce neurobehavioral changes rang- PM287 ing from mood alterations and psychotic episodes in human to Mixtures of opioid receptor agonists and cannabi- hyperactivity and stereotyped motion in mice. In the study, we noid receptor agonists: enhanced antinociception tested the pharmacological properties of ketamine on anxiety, without abuse liability locomotion and motor activity. Charles P France, David R Maguire, Vanessa Minervini Materials and Methods: Subjects were C57BL/6J mice with age Department of Pharmacology, University of Texas Health Science of 6 and 12 weeks at the time of testing. Mice were housed in Center, San Antonio, Texas USA a temperature- and humidity-controlled vivarium under a 12 h life-dark cycle with ad libitum access to food and water. Abstract Sensitivity to acute intoxicating effect was assessed using accel- Mu opioid receptor agonists remain the drugs of choice for erating rotarod under given doses of ketamine (0, 10, 25, 50 mg/ treating moderate-severe pain despite their well-documented kg, respectively). The elevated plus-mage (EPM) was used to adverse effects (constipation, respiratory depression, abuse). evaluate the anxiety-like behaviors. Open field with videotrack- Kappa opioid receptor agonists also have antinociceptive ing system was adapted to measure the motor responses follow- effects although adverse effects (dysphoria, hallucinations) ing acute and chronic ketamine injections. have precluded their use in the clinic. One strategy for reduc- Results: The results demonstrated that the ketamine could ing or avoiding the adverse effects of opioid receptor agonists dose-dependently potentiate the motor ataxia and significantly (mu and possibly kappa) is to combine them with drugs that increased the open-arm entries at the dose of 25 mg/kg through exert antinociceptive effects through nonopioid mechanisms. EPM assessment. Ketamine produced hyperactivity at the The need for much smaller doses of each drug in a drug mix- age of both 6 and 12 weeks. The adolescent mice significantly ture, to achieve the desired therapeutic effect, has the poten- increased the total moving distance and speed compared to the tial to avoid the adverse effects that occur with larger doses of adult group. either drug administered alone, thereby increasing the thera- Conclusion: These findings suggest that the effect ketamine is peutic window of both drugs. These studies used adult male regulated by age and potentiating the sensitivity in the adoles- rats to examine the antinociceptive effects of mu and kappa cent mice. opioid receptor
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