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https://www.readbyqxmd.com/read/29154367/effects-of-amphetamine-on-sensorimotor-gating-and-neurocognition-in-antipsychotic-medicated-schizophrenia-patients
#1
Neal R Swerdlow, Savita G Bhakta, Jo A Talledo, Daniel M Franz, Erica L Hughes, Brinda K Rana, Gregory A Light
Prepulse inhibition (PPI) of startle is being explored both as an indicator of target engagement for, and a biomarker predicting sensitivity to, pro-cognitive effects of drugs. We now report the effects of the pro-attentional drug, d-amphetamine, on PPI and neurocognition in antipsychotic-medicated schizophrenia patients and healthy subjects (HS) who were also tested in a targeted cognitive training (TCT) module. 44 HS and 38 schizophrenia patients completed a double-blind, placebo-controlled crossover study of the effects of a single dose of amphetamine (10 mg po) on PPI and MATRICS Consensus Cognitive Battery (MCCB) performance; TCT results were previously reported from 60 of these subjects...
November 20, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29102783/influence-of-intertrial-interval-on-basal-and-drug-induced-impulsive-action-in-the-5-choice-serial-reaction-time-task-effects-of-d-amphetamine-and-%C3%A2-2-5-dimethoxy-4-iodoamphetamine-doi
#2
Ciaràn M Fitzpatrick, Vojislav S Maric, Simon T Bate, Jesper T Andreasen
Impulsivity is a characteristic of a number of neuropsychiatric disorders such as attention-deficit/hyperactivity disorder. The 5-choice serial reaction time task (5-CSRTT) is a rodent paradigm extensively used to assess attention and impulsivity. Notably, 5-CSRTT studies do not typically account for the reduction in premature responding, the measure of impulsive action, occurring upon repeated exposure to test sessions with long or variable intertrial intervals (ITIs). This present 5-CSRTT study investigated the use of variable ITIs (5, 10 or 15s) across 15 test days (4 training days followed by 1 drug test day per week for three weeks) as previous experience had shown that 4 training days would be sufficient to induce consistent premature response levels in male C57BL/6J mice...
November 2, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29074414/non-adrenergic-vasoconstriction-and-vasodilatation-of-guinea-pig-aorta-by-%C3%AE-phenylethylamine-and-amphetamine-role-of-nitric-oxide-determined-with-l-name-and-no-scavengers
#3
Kenneth J Broadley, Harrison D Broadley
Sympathomimetic and trace amines, including β-phenylethylamine (PEA) and amphetamine, increase blood pressure and constrict isolated blood vessels. By convention this is regarded as a sympathomimetic response, however, recent studies suggest trace amine-associated receptor (TAAR) involvement. There is also uncertainty whether these amines also release nitric oxide (NO) causing opposing vasodilatation. These questions were addressed in guinea-pig isolated aorta, a species not previously examined. Guinea-pig aortic rings were set up to measure contractile tension...
October 23, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29048188/effects-of-environmental-enrichment-on-d-amphetamine-self-administration-following-nicotine-exposure
#4
Dustin J Stairs, Sarah E Ewin, Megan M Kangiser, Markus N Pfaff
Adolescent nicotine exposure has been shown to lead to further psychostimulant use in adulthood. Previous preclinical research in rats has shown that environmental enrichment may protect against drug abuse vulnerability. The current study was designed to examine whether environmental enrichment can block the ability of adolescent nicotine exposure to increase d-amphetamine self-administration in adulthood. Male Sprague-Dawley rats were raised in either enriched conditions (ECs) or isolated conditions (ICs) and then injected with saline or nicotine (0...
October 2017: Experimental and Clinical Psychopharmacology
https://www.readbyqxmd.com/read/29040826/maintenance-on-naltrexone-amphetamine-decreases-cocaine-vs-food-choice-in-male-rhesus-monkeys
#5
Megan J Moerke, Matthew L Banks, Kejun Cheng, Kenner C Rice, S Stevens Negus
BACKGROUND: Cocaine use disorder remains a significant public health issue for which there are no FDA-approved pharmacotherapies. Amphetamine maintenance reduces cocaine use in preclinical and clinical studies, but the mechanism of this effect is unknown. Previous studies indicate a role for endogenous opioid release and subsequent opioid receptor activation in some amphetamine effects; therefore, the current study examined the role of mu-opioid receptor activation in d-amphetamine treatment effects in an assay of cocaine-vs-food choice...
December 1, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/29032769/amphetamine-modestly-improves-conners-continuous-performance-test-performance-in-healthy-adults
#6
David A MacQueen, Arpi Minassian, Brook L Henry, Mark A Geyer, Jared W Young, William Perry
OBJECTIVES: Amphetamine improves vigilance as assessed by continuous performance tests (CPT) in children and adults with attention deficit hyperactivity disorder (ADHD). Less is known, however, regarding amphetamine effects on vigilance in healthy adults. Thus, it remains unclear whether amphetamine produces general enhancement of vigilance or if these effects are constrained to the remediation of deficits in patients with ADHD. METHODS: We tested 69 healthy adults (35 female) on a standardized CPT (Conner's CPT-2) after receiving 10- or 20-mg d-amphetamine or placebo...
October 16, 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28936175/pharmacokinetics-and-pharmacodynamics-of-lisdexamfetamine-compared-with-d-amphetamine-in-healthy-subjects
#7
Patrick C Dolder, Petra Strajhar, Patrick Vizeli, Felix Hammann, Alex Odermatt, Matthias E Liechti
Rationale: Lisdexamfetamine is a prodrug of D-amphetamine used for the treatment of attention-deficit/hyperactivity disorder (ADHD). Lisdexamfetamine is thought to have a prolonged pharmacokinetic profile compared with oral D-amphetamine, possibly associated with lower drug liking and a lower risk of oral misuse. However, differences in the pharmacokinetics and pharmacodynamics of lisdexamfetamine and D-amphetamine have not been directly compared. Methods: Equimolar doses of D-amphetamine (40 mg) and lisdexamfetamine (100 mg), and placebo were administered in 24 healthy subjects in a randomized, double-blind, placebo-controlled, cross-over study...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28925314/effect-of-methylphenidate-on-visual-responses-in-the-superior-colliculus-in-the-anaesthetised-rat-role-of-cortical-activation
#8
L Hetherington, E J Dommett, A C Turner, T B Riley, J X Haensel, P G Overton
The mechanism of action of psychostimulant drugs in the treatment of Attention Deficit Hyperactivity Disorder is still largely unknown, although recent evidence suggests one possibility is that the drugs affect the superior colliculus (SC). We have previously demonstrated that systemically administered d-amphetamine attenuates/abolishes visual responses to wholefield light flashes in the superficial layers of the SC in anaesthetised rats, and the present study sought to extend this work to methylphenidate (MPH)...
October 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28889212/cocaine-like-discriminative-stimulus-effects-of-norepinephrine-preferring-monoamine-releasers-time-course-and-interaction-studies-in-rhesus-monkeys
#9
Stephen J Kohut, David S Jacobs, Richard B Rothman, John S Partilla, Jack Bergman, Bruce E Blough
RATIONALE: The therapeutic potential of monoamine releasers with prominent dopaminergic effects is hindered by their high abuse liability. OBJECTIVES: The present study examined the effects of several novel "norepinephrine (NE)-preferring" monoamine releasers relative to non-selective monoamine releasers, d-amphetamine and d-methamphetamine, in rhesus monkeys trained to discriminate cocaine. NE-preferring releasers were approximately 13-fold more potent for NE compared to dopamine release and ranged in potency for serotonin release (PAL-329 < l-methamphetamine < PAL-169)...
December 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28878639/differential-associations-between-cortical-thickness-and-striatal-dopamine-in-treatment-na%C3%A3-ve-adults-with-adhd-vs-healthy-controls
#10
Mariya V Cherkasova, Nazlie Faridi, Kevin F Casey, Kevin Larcher, Gillian A O'Driscoll, Lily Hechtman, Ridha Joober, Glen B Baker, Jennifer Palmer, Alan C Evans, Alain Dagher, Chawki Benkelfat, Marco Leyton
Alterations in catecholamine signaling and cortical morphology have both been implicated in the pathophysiology of attention deficit/hyperactivity disorder (ADHD). However, possible links between the two remain unstudied. Here, we report exploratory analyses of cortical thickness and its relation to striatal dopamine transmission in treatment-naïve adults with ADHD and matched healthy controls. All participants had one magnetic resonance imaging (MRI) and two [(11)C]raclopride positron emission tomography scans...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28860974/striatal-distribution-and-cytoarchitecture-of-dopamine-receptor-subtype-1-and-2-evidence-from-double-labeling-transgenic-mice
#11
Keke Ren, Baolin Guo, Chunqiu Dai, Han Yao, Tangna Sun, Xia Liu, Zhantao Bai, Wenting Wang, Shengxi Wu
As the main input nucleus of the basal ganglion, the striatum executes different functions, including motivation, reward and attention. The functions of the striatum highly rely on its subregions that receive projections from various cortical areas and the distribution of striatonigral neurons that express D1 dopamine (DA) receptors (or D1 medium-sized spiny neurons, D1 MSNs) and striatopallidal neurons that express D2 DA receptors (or D2 MSNs). Using bacterial artificial chromosome (BAC) transgenic mice, several studies have recently been performed on the spatial distribution of D1 and D2 MSNs...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28855799/review-of-lisdexamfetamine-dimesylate-in-adults-with-attention-deficit-hyperactivity-disorder
#12
REVIEW
Jadwiga Najib, Dexter Wimer, Julie Zeng, Kristina W Lam, Natalya Romanyak, Eva Paige Morgan, Anu Thadavila
Lisdexamfetamine dimesylate (LDX) is the first prodrug stimulant used for the treatment of attention-deficit/hyperactivity disorder (ADHD) dosed once daily. Due to its long-acting properties, LDX remains pharmacologically inactive until an enzymatic process predominantly associated with red blood cells converts it to the active ingredient, d-amphetamine and the amino acid lysine. The efficacy of LDX over placebo has been demonstrated in several studies in adults with moderate to severe ADHD with significant improvements noted in ADHD rating scales, Clinical Global Improvement scores, and assessments of executive function, for all doses of LDX (30-70 mg daily)...
2017: Journal of Central Nervous System Disease
https://www.readbyqxmd.com/read/28828549/postnatal-hypoxia-evokes-persistent-changes-within-the-male-rat-s-dopaminergic-system
#13
Michael J Decker, Karra A Jones, Glenda L Keating, David B Rye
PURPOSE: Hypoxic insults occurring during the perinatal period remain the leading cause of permanent brain impairment. Severe cognitive and motor dysfunction, as seen in cerebral palsy, will occur in 4-10% of post-hypoxic newborns. Subtle cognitive impairment, apparent in disorders of minimal brain dysfunction will occur in > 3 million post-hypoxic newborns. Analyses of post-hypoxic rodent brains reveal reduced extracellular levels of dopamine, a key neurotransmitter of vigilance, execute function, and behavior...
August 22, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/28815279/evaluation-of-training-dose-in-male-sprague-dawley-rats-trained-to-discriminate-4-methylmethcathinone
#14
Michael D Berquist, Nathyn A Thompson, Lisa E Baker
RATIONALE: Although the synthetic cathinone 4-methylmethcathinone (4-MMC, mephedrone) has been a subject of intensive research investigation, the pharmacological mechanisms involved in its interoceptive stimulus effects have yet to be fully characterized. OBJECTIVE: The present study employed drug discrimination methods in rats to compare the interoceptive stimulus properties of two different training doses of 4-MMC to other substances with similar pharmacological actions...
November 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28772011/brain-molecular-changes-and-behavioral-alterations-induced-by-propofol-anesthesia-exposure-in-peripubertal-rats
#15
Željko Pavković, Kosara Smiljanić, Selma Kanazir, Desanka Milanović, Vesna Pešić, Sabera Ruždijić
BACKGROUND: Propofol is commonly used in modern anesthesiology. Some findings suggest that it is highly addictive. AIM: In this study it was examined whether propofol anesthesia exposure was able to induce behavioral alterations and brain molecular changes already described in addictive drug usage in peripubertal rats, during the onset of mid/periadolescence as a developmental period with increasing vulnerability to drug addiction. METHODS: The expression of D1 dopamine receptor, a dopamine, and cAMP-regulated phosphoprotein with a Mr 32 000; Ca(2+) /calmodulin-dependent protein kinase IIα; and Finkel-Biskis-Jinkins murine osteosarcoma viral oncogene homolog-B was examined in peripubertal rats 4, 24, and 48 hour after propofol anesthesia exposure by Western blot and immunohistochemistry...
September 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28762072/sweet-taste-liking-is-associated-with-subjective-response-to-amphetamine-in-women-but-not-men
#16
Jessica Weafer, Nicholas Lyon, Donald Hedeker, Harriet de Wit
RATIONALE AND OBJECTIVE: Preference for sweet taste rewards has been linked to the propensity for drug use in both animals and humans. Here, we tested the association between sweet taste liking and sensitivity to amphetamine reward in healthy adults. We hypothesized that sweet likers would report greater euphoria and stimulation following D-amphetamine (20 mg) compared to sweet dislikers. METHODS: Men (n = 36) and women (n = 34) completed a sweet taste test in which they rated their liking of various concentrations of sucrose and filtered water (0...
November 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28728424/annals-express-false-negative-results-in-the-immunoassay-analysis-of-drugs-of-abuse-can-adulterants-be-detected-by-sample-check-test
#17
Barbara Matriciani, Bernd Huppertz, Ruprecht Keller, Ralf Weiskirchen
BACKGROUND: The dilution or adulteration of urine is a serious problem in drugs of abuse (DOA) testing. Tests to identify adulteration are currently available. This study investigated the ability of the CEDIA® sample check to detect adulteration. METHODS: Eight different DOAs were added to a urine sample obtained from a healthy, drug free subject: 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine, 3,4-methylenedioxyamphetamine, benzoylecgonine, D-amphetaminesulfate, ethyl-D-glucuronide, morphine sulfate, oxazepam, (-)-11-nor-9-carboxy-∆(9)-tetrahydrocannabinol...
January 1, 2017: Annals of Clinical Biochemistry
https://www.readbyqxmd.com/read/28716726/early-life-risperidone-enhances-locomotor-responses-to-amphetamine-during-adulthood
#18
Bobbie Lee Stubbeman, Clifford J Brown, Justin R Yates, Mark E Bardgett
Antipsychotic drug prescriptions for pediatric populations have increased over the past 20 years, particularly the use of atypical antipsychotic drugs such as risperidone. Most antipsychotic drugs target forebrain dopamine systems, and early-life antipsychotic drug exposure could conceivably reset forebrain neurotransmitter function in a permanent manner that persists into adulthood. This study determined whether chronic risperidone administration during development modified locomotor responses to the dopamine/norepinephrine agonist, D-amphetamine, in adult rats...
October 5, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28704276/effects-of-d1-and-d2-receptor-antagonists-on-the-discriminative-stimulus-effects-of-methylendioxypyrovalerone-and-mephedrone-in-male-sprague-dawley-rats-trained-to-discriminate-d-amphetamine
#19
Eric L Harvey, Rachel L Burroughs, Lisa E Baker
Psychopharmacology research has amassed substantial evidence for similarities between synthetic cathinones and other commonly abused psychostimulants. Few studies have utilized drug discrimination methods to investigate synthetic cathinones, and the precise neurochemical substrates underlying their interoceptive effects have not been examined. The present study assessed the involvement of D1 and D2 dopaminergic receptors in the stimulus effects of 3,4-methylenedioxypyrovalerone (MDPV) and mephedrone (MEPH) in rats trained to discriminate D-amphetamine...
October 2017: Behavioural Pharmacology
https://www.readbyqxmd.com/read/28633996/effects-of-monoaminergic-drugs-on-training-induced-motor-cortex-plasticity-in-older-adults
#20
Trisha M Kesar, Samir R Belagaje, Paola Pergami, Marc W Haut, Gerald Hobbs, Cathrin M Buetefisch
Primary motor cortex (M1) plasticity is involved in motor learning and stroke motor recovery, and enhanced by increasing monoaminergic transmission. Age impacts these processes but there is a paucity of systematic studies on the effects of monoaminergic drugs in older adults. Here, in ten older adults (age 61+4years, 4 males), we determine the effects of a single oral dose of carbidopa/levodopa (DOPA), d-amphetamine (AMPH), methylphenidate (MEPH) and placebo (PLAC) on M1 excitability and motor training-induced M1 plasticity...
September 1, 2017: Brain Research
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