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COMMUNICATIONS. Br J Pharmacol 2012. [DOI: 10.1111/j.1476-5381.1985.tb14736.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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How does the physiology change with symptom exacerbation and remission in schizophrenia? Behav Brain Sci 2011. [DOI: 10.1017/s0140525x00065122] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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A cardinal principle for neuropsychology, with implications for schizophrenia and mania. Behav Brain Sci 2011. [DOI: 10.1017/s0140525x00065195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Abstract
AbstractA model is proposed for integrating the neural and cognitive aspects of the positive symptoms of acute schizophrenia, using evidence from postmortem neuropathology and neurochemistry, clinical and preclinical studies of dopaminergic neurotransmission, anatomical connections between the limbic system and basal ganglia, attentional and other cognitive abnormalities underlying the positive symptoms of schizophrenia, specific animal models of some of these abnormalities, and previous attempts to model the cognitive functions of the septohippocampal system and the motor functions of the basal ganglia. Anatomically, the model emphasises the projections from the septohippocampal system, via the subiculum, and the amygdala to nucleus accumbens, and their interaction with the ascending dopaminergic projection to the accumbens. Psychologically, the model emphasises a failure in acute schizophrenia to integrate stored memories of past regularities of perceptual input with ongoing motor programs in the control of current perception. A number of recent experiments that offer support for the model are briefly described, including anatomical studies of limbic-striatal connections, studies in the rat of the effects of damage to these connections, and of the effects of amphetamine and neuroleptics, on the partial reinforcement extinction effect, latent inhibition and the Kamin blocking effect; and studies of the latter two phenomena in acute and chronic schizophrenics.
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A realistic model will be much more complex and will consider longitudinal neuropsychodevelopment. Behav Brain Sci 2011. [DOI: 10.1017/s0140525x00065286] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
AbstractAnimal research suggests that central serotonergic neurons are involved in behavioral suppression, particularly anxiety-related inhibition. The hypothesis linking decreased serotonin transmission to reduced anxiety as the mechanism in the anxiolytic activity of benzodiazepines conflicts with most clinical observations. Serotonin antagonists show no marked capacity to alleviate anxiety. On the other hand, clinical signs of reduced serotonergic transmission (low 5-HIAA levels in the cerebrospinal fluid) are frequently associated with aggressiveness, suicide attempts, and increased anxiety. The target article attempts to reconcile such human and animal findings by investigating whether anxiety reduction or increased impulsivity is more Likely to account for animal behavioral changes associated with decreased serotonergic transmission. The effects of manipulating central serotonin in experimental anxiety paradigms in animals (punishment, extinction, novelty) are reviewed and compared with the effects of antianxiety drugs. Anxiety seems neither necessary nor sufficient to induce control by serotonergic neurons on behavior. Further evidence suggests that behavioral effects of anxiolytics thought to be mediated by decreases in anxiety are not caused by the ability of these drugs to reduce serotonin transmission. Blockade of serotonin transmission, especially at the level of the substantia nigra, results in a shift of behavior toward facilitation of responding. This behavioral shift is particularly marked when there is competition between acting and restraining response tendencies and when obstacles prevent the immediate attainment of an anticipated reward. It is proposed that serotonergic neurons are involved not only in behavioral arousal but also in enabling the organism to arrange or tolerate delay before acting. Decreases in serotonin transmission seem to be associated with the increased performance of behaviors that are usually suppressed, though not necessarily because of the alleviation of anxiety, which might contribute to the suppression.
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Mongeau R, Blier P, de Montigny C. The serotonergic and noradrenergic systems of the hippocampus: their interactions and the effects of antidepressant treatments. BRAIN RESEARCH. BRAIN RESEARCH REVIEWS 1997; 23:145-95. [PMID: 9164669 DOI: 10.1016/s0165-0173(96)00017-3] [Citation(s) in RCA: 291] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Previous reviews have well illustrated how antidepressant treatments can differentially alter several neurotransmitter systems in various brain areas. This review focuses on the effects of distinct classes of antidepressant treatments on the serotonergic and the noradrenergic systems of the hippocampus, which is one of the brain limbic areas thought to be relevant in depression: it illustrates the complexity of action of these treatments in a single brain area. First, the basic elements (receptors, second messengers, ion channels, ...) of the serotonergic and noradrenergic systems of the hippocampus are revisited and compared. Second, the extensive interactions occurring between the serotonergic and the noradrenergic systems of the brain are described. Finally, issues concerning the short- and long-term effects of antidepressant treatments on these systems are broadly discussed. Although there are some contradictions, the bulk of data suggests that antidepressant treatments work in the hippocampus by increasing and decreasing, respectively, serotonergic and noradrenergic neurotransmission. This hypothesis is discussed in the context of the purported function of the hippocampus in the formation of memory traces and emotion-related behaviors.
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Affiliation(s)
- R Mongeau
- Department of Psychiatry, McGill University, Montréal, Québec, Canada
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el Mansari M, Blier P. In vivo electrophysiological characterization of 5-HT receptors in the guinea pig head of caudate nucleus and orbitofrontal cortex. Neuropharmacology 1997; 36:577-88. [PMID: 9225283 DOI: 10.1016/s0028-3908(97)00035-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The aim of the present study was to characterize in vivo the 5-HT receptor subtypes which mediate the effect of microiontophoretic applied 5-HT in the guinea pig head of caudate nucleus and orbitofrontal cortex. 5-HT and the preferential 5-HT2A receptor agonist DOI and the preferential 5-HT2C receptor agonist mCPP, suppressed the quisqualate (QUIS)-induced activation of neurons in both structures. The inhibitory effect of DOI and mCPP was not prevented by acute intravenous administration of the 5-HT1/2 receptor antagonist metergoline (2 mg/kg) and the 5-HT2A/2C receptor antagonist ritanserin (2 mg/kg) in the two regions nor by the selective 5-HT2A receptor antagonist MDL100907 (1 mg/kg) in the head of caudate nucleus. However, the inhibitory effect of DOI, but not that of mCPP, was antagonized by a 4-day treatment with metergoline and ritanserin (2 mg/kg/day; using minipumps implanted subcutaneously) in head of caudate nucleus, but not in orbitofrontal cortex. Microiontophoretic ejection of the 5-HT1A/7 receptor agonist 8-OH-DPAT and of the 5-HT1A receptor antagonist WAY100635 both suppressed the spontaneous and QUIS-activated firing activity of orbitofrontal cortex neurons. At current which did not affect the basal discharge activity of the neuron recorded, microiontophoretic application of WAY100635 and BMY7378 failed to prevent the inhibitory effect of 8-OH-DPAT. The inhibitory effect of gepirone, which is a 5-HT1A receptor agonist but devoid of affinity for 5-HT7 receptors, was also not antagonized by WAY100635. Altogether, these results suggest the presence of atypical 5-HT1A receptors in the orbitofrontal cortex. The present results also indicate that the suppressant effect of DOI may be mediated by 5-HT2A receptors in head of caudate nucleus and atypical 5-HT2 receptors in orbitofrontal cortex.
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Affiliation(s)
- M el Mansari
- Neurobiological Psychiatry Unit, McGill University, Montréal, Québec, Canada.
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Walcourt-Ambakederemo A, Winlow W. 5-HT receptors on identified Lymnaea neurones in culture: pharmacological characterization of 5-HT3 receptors. GENERAL PHARMACOLOGY 1995; 26:553-61. [PMID: 7789728 DOI: 10.1016/0306-3623(94)00216-a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
1. The selective agonist, 1-(m-chlorophenyl)-biguanide (m-CPBG) and antagonist, 3-tropanyl-3,5-dichlorobenzoate (MDL 72222) were used to characterize the 5-HT3 receptors in cultured identified neurones; the serotonin-containing cerebral giant cells (CGCs) and some follower neurones in the buccal ganglia of Lymnaea stagnalis. 2. 5-HT and its agonists were pressure ejected, while the 5-HT antagonists were bath applied. 3. Although m-CPBG evoked mostly depolarizing responses, hyperpolarizing responses were sometimes evoked. 4. At 10(-4) M, m-CPBG failed to mimic the responses of 5-HT, but at a concentration higher, 10(-3) M, pressure-ejected m-CPBG mimicked most 5-HT responses. 5. The 5-HT2 antagonist ketanserin failed to block the m-CPBG-evoked responses, whilst partially blocking the 5-HT responses. 6. These results suggest the presence of 5-HT3 receptors similar to those found in mammalian neurones, and that multiple subtypes of these receptors may be present in Lymnaea neurones.
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Walcourt-Ambakederemo A, Winlow W. 5-HT receptors on identified Lymnaea neurones in culture: pharmacological characterization of 5-HT2 receptors. GENERAL PHARMACOLOGY 1994; 25:1079-92. [PMID: 7875529 DOI: 10.1016/0306-3623(94)90122-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
1. Pressure ejection techniques were used to investigate the identify of receptors mediating 5-HT (5-Hydroxytryptamine) effects on the serotonin-containing cerebral giant cells (CGCs) of the cerebral ganglia and some of their follower motorneurones from the buccal ganglia of Lymnaea stagnalis in culture. 2. The vertebrate 5-HT2 receptor agonist alpha-methylserotonin maleate (10(-4) M), inhibited most of the neurones inhibited by 5-HT (10(-3) M). Others were excited by both agonists. In cells where 5-HT failed to evoke any effects, the 5-HT2 agonist also lacked an effect. 3. Bath application of the 5-HT2 receptor antagonists ketanserin and methysergide (10(-4) M), not only blocked spike generation, but also reduced both the excitatory and inhibitory responses to both 5-HT and alpha-methylserotonin maleate, while the 5-HT3 antagonist MDL 72222 (10(-4) M) failed to block alpha-methylserotonin maleate effects. 4. At 10(-3) M, alpha-methylserotonin maleate increased the amplitudes of the hyperpolarizing responses in a dose-dependent manner. These responses were blocked by ketanserin (10(-4) M). 5. The above results suggest that 5-HT2 receptors are involved in the responses of the CGCs and the buccal motorneurones to 5-HT in Lymnaea stagnalis. The pharmacological characterization of these receptors indicates that the compounds that interact with the 5-HT2 receptors in mammals also interact with the 5-HT2 receptors in molluscs.
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Simpson CW, Ruwe WD, Myers RD. Prostaglandins and hypothalamic neurotransmitter receptors involved in hyperthermia: a critical evaluation. Neurosci Biobehav Rev 1994; 18:1-20. [PMID: 7909592 DOI: 10.1016/0149-7634(94)90033-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The role of a prostaglandin of the E series (PGE) in the hypothalamic mechanisms underlying a fever continues to be controversial. This paper reviews the historical literature and current findings on the central action of the PGEs on body temperature (Tb). New experiments were undertaken to examine the local effect of muscarinic, nicotinic, serotonergic, alpha-adrenergic, or beta-adrenergic receptor antagonists at hypothalamic sites where PGE1 caused a rise in Tb of the primate. Guide tubes for microinjection were implanted stereotaxically above sites in and around the anterior hypothalamic, preoptic area (AH/POA) of male Macaque monkeys. Following postoperative recovery, 30-100 ng of PGE1 was micro-injected unilaterally in a volume of 1.0-1.5 microliter at sites in the AH/POA to evoke a rise in Tb, and once identified, pretreated with a receptor antagonist. PGE1 hyperthermia was significantly reduced by microinjections of the muscarinic and nicotinic antagonists, atropine, or mecamylamine, at PGE1 reactive sites in the AH/POA. The serotonergic antagonist, methysergide, injected at PGE1 sensitive sites in the ventromedial hypothalamus also attenuated the rise in Tb. However, the 5-HT reuptake blocker, fluoxetine, and the beta-adrenergic receptor antagonist, propranolol, injected in the AH/POA failed to alter the PGE1 hyperthermia. In contrast, the alpha-adrenergic antagonist, phentolamine, potentiated the increase in Tb at all PGE1 reactive sites in the hypothalamus. An updated model is presented to explain how the concurrent actions of aminergic neurotransmitters acting on their respective receptors in the hypothalamus can interact with a PGE to elicit hyperthermia. Finally, an evaluation of the current literature including recent findings on macrophage inflammatory protein (MIP-1) supports the conclusion that a PGE in the brain is neither an obligatory nor essential factor for the expression of a pyrogen fever.
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Affiliation(s)
- C W Simpson
- Division of Molecular Biology and Biochemistry, University of Missouri, Kansas City 64108
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Jäkälä P, Sirviö J, Riekkinen P, Riekkinen PJ. Effects of p-chlorophenylalanine and methysergide on the performance of a working memory task. Pharmacol Biochem Behav 1993; 44:411-8. [PMID: 8446673 DOI: 10.1016/0091-3057(93)90483-a] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The present study investigated the effects of serotonergic dysfunction on working memory. Therefore, the effects of inhibition of serotonin [5-hydroxytryptamine (5-HT)] synthesis induced by p-chlorophenylalanine (p-CPA) and pharmacological blockade of 5-HT receptors by methysergide on the performance of rats in a delayed nonmatching to position task assessing spatial working memory were studied. Methysergide (1.0, 5.0, or 15.0 mg/kg) significantly disrupted behavioral activity of rats and decreased the percent correct total responses. However, the impairment in the percent correct responses was delay independent, indicating a nonmnemonic disruption of the performance. p-CPA (500 mg/kg/day x 3) induced an almost total depletion (> 97%) of frontal cortical and hippocampal serotonin and its major metabolite 5-hydroxyindoleacetic acid and slightly affected noradrenergic and dopaminergic systems. p-CPA treatment did not affect the percent correct responses. However, the behavioral activity of rats was slightly decreased by p-CPA. The disruptions in behavioral activity and the percent correct responses induced by methysergide (2.0 mg/kg) were not abolished by p-CPA. The present results do not support any important role for the serotonergic system in spatial working memory as assessed using the delayed nonmatching to position task.
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Affiliation(s)
- P Jäkälä
- Department of Neurology, University of Kuopio, Finland
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Mendelson SD. A review and reevaluation of the role of serotonin in the modulation of lordosis behavior in the female rat. Neurosci Biobehav Rev 1992; 16:309-50. [PMID: 1528523 DOI: 10.1016/s0149-7634(05)80204-0] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The role of serotonin (5-HT) in the modulation of sexual receptivity (lordosis) in the female rat is reviewed and reevaluated. The effects on lordosis of drug treatments that decrease or increase the activity and availability of central 5-HT are first discussed, and this is followed by an evaluation of the effects of drugs that act directly at 5-HT receptors. In order to shed light on the physiological significance of effects of serotonergic drugs on lordosis, there is also a review of what is known of changes in levels of serotonergic activity and densities of 5-HT receptors in the female rat brain that take place through the estrous cycle and in response to administration of behaviorally effective doses of gonadal steroids. Serotonin has generally been thought to have a tonic, inhibitory effect on lordosis. However, it is concluded that 5-HT can either inhibit or facilitate lordosis depending on which subtypes of central 5-HT receptors become activated. Because of a lack of consistent or compelling evidence of effects of ovarian hormones on serotonergic activity or 5-HT receptors in critical areas of the brain, it is stated that there is at present no basis to conclude that the effects of pharmacological manipulations of serotonergic activity on lordosis reflect an important, physiological role of 5-HT in the modulation of lordosis behavior in the female rat.
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Affiliation(s)
- S D Mendelson
- Laboratory of Neuroendocrinology, Rockefeller University, New York, NY 10021
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Ashby CR, Edwards E, Wang RY. Action of serotonin in the medial prefrontal cortex: mediation by serotonin3-like receptors. Synapse 1992; 10:7-15. [PMID: 1536032 DOI: 10.1002/syn.890100103] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In the present study, we investigated the effects of various serotonin (5-HT) antagonists on 5-HT's action on medial prefrontal cortical cells (mPFc) using the techniques of single cell recording and microiontophoresis. The microiontophoretic application of 5-HT (10-80 nA) produced a current-dependent suppression of mPFc cell firing and this effect was blocked by the selective 5-HT3 receptor antagonists (+/-)-zacopride, ICS 205930 and granisetron at currents of 5-20 nA. Furthermore, the intravenous (i.v.) administration of (+/-)-zacopride (5-50 micrograms/kg) markedly attenuates the suppressive action of 5-HT on mPFc cell firing. In contrast, the microiontophoresis of 5-HT1 and 5-HT2 receptor antagonists such as (+/-)-pindolol, spiperone, metergoline, and ritanserin (10-20 nA) failed to block 5-HT's effect. In fact, in some cells, spiperone and ritanserin potentiated 5-HT's action and prolonged neuronal recovery. In addition, the intravenous administration of either ritanserin (5-2,000 micrograms/kg) or metergoline (4-2,400 micrograms/kg) failed to alter 5-HT's action. The electrical stimulation of the caudal linear raphe nucleus (CLi) suppressed the spontaneous activity of 83% of the mPFc cells tested by 45 +/- 2%. This suppression was significantly attenuated by the iontophoresis of granisetron (2.5-5 nA) but not by the 5-HT2 and 5-HT1C receptor antagonist ritanserin or the relatively selective 5-HT2 receptor antagonist (+)-MDL 11,939 (10-40 nA). However, the i.v. administration of ritanserin (0.5-1.5 mg/kg) or S-zacopride (0.1 mg/kg) significantly blocked the suppression of mPFc cell firing produced by CLi stimulation.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- C R Ashby
- Department of Psychiatry and Behavioral Sciences, State University of New York, Stony Brook 11794-8790
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Robertson B, Baker GB, Vanderwolf CH. The effects of serotonergic stimulation on hippocampal and neocortical slow waves and behavior. Brain Res 1991; 555:265-75. [PMID: 1933339 DOI: 10.1016/0006-8993(91)90351-u] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The effect of central serotonergic stimulation on hippocampal and neocortical electrical activity and behavior was studied in freely moving rats by administering: (a) tranylcypromine followed by tryptophan, (b) fluoxetine followed by 5-hydroxytryptophan, or (c) p-chloroamphetamine alone. In all rats, scopolamine-resistant hippocampal rhythmical slow activity (RSA), thought to be dependent on brain serotonin, maintained its normal relation to behavior, occurring in close correlation with Type 1 behaviors (postural changes, turning of the head, walking). This RSA was generally absent during stereotyped behavior (head weaving, forepaw treading, hindlimb splaying and tremor). Scopolamine-resistant neocortical low-voltage fast activity (LVFA), also though to be dependent on brain serotonin, was present during Type 1 behaviors and also during stereotyped behavior. Most rats that developed a full stereotyped behavior syndrome had behavioral and electrocortical seizures which were associated with a reduction in the amplitude of hippocampal activity. These seizures were suppressed by methysergide or benserazide. Metergoline (and methysergide to a lesser extent) suppressed the stereotypic behaviors of the serotonin syndrome, resulting in a striking increase in the locomotion caused by central serotonergic stimulation. Such locomotion was accompanied by RSA and LVFA. It was concluded that increased serotonergic activity in the CNS causes an increase in motor activity and a correlated increase in scopolamine-resistant hippocampal RSA and scopolamine-resistant neocortical LVFA and suggested that metergoline blocks serotonin receptors mediating stereotyped behaviors, thereby permitting the expression of serotonin-mediated locomotion.
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Affiliation(s)
- B Robertson
- Department of Psychology, University of Western Ontario, London, Canada
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Markowska AL, Wenk GL. Serotonin influences the behavioral recovery of rats following nucleus basalis lesions. Pharmacol Biochem Behav 1991; 38:731-7. [PMID: 1651515 DOI: 10.1016/0091-3057(91)90234-s] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The present study investigated the effects of serotonergic depletion upon the performance of rats with lesions of the nucleus basalis magnocellularis (NBM) in a nonspatial memory task. NBM lesions were made by injections of ibotenic acid. Serotonin was depleted by systemic injections of p-chloroamphetamine (PCA). After four weeks of testing, the choice accuracy of PCA rats was not different from that of control rats (CON), while the choice accuracy of NBM rats and rats with combined treatment (NBM + PCA) was significantly lower than CON rats, but not different from each other. After prolonged testing, performance improved in NBM rats, but not in NBM + PCA rats indicating that simultaneous loss of both cholinergic and serotonergic neurotransmission produced a significantly longer lasting behavioral deficit than the loss of cholinergic neurotransmission alone.
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Affiliation(s)
- A L Markowska
- Department of Psychology, The Johns Hopkins University, Baltimore, MD 21218
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Neuro-developmental, brain imaging and psychophysiological perspectives on the neuropsychology of schizophrenia. Behav Brain Sci 1991. [DOI: 10.1017/s0140525x00065316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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The mechanism of positive symptoms in schizophrenia. Behav Brain Sci 1991. [DOI: 10.1017/s0140525x00065201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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The neuropsychology of schizophrenia: In step but not in time. Behav Brain Sci 1991. [DOI: 10.1017/s0140525x00065419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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