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Tonni G, Lituania M, Carboni E, Cecchi A, Sepulveda W. Decollatio (decapitation): early catastrophic event detected by transvaginal three-dimensional ultrasound with pathological confirmation. Ultrasound Obstet Gynecol 2024; 63:276-277. [PMID: 37698521 DOI: 10.1002/uog.27467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 08/04/2023] [Accepted: 08/15/2023] [Indexed: 09/13/2023]
Affiliation(s)
- G Tonni
- Department of Obstetrics and Neonatology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), AUSL Reggio Emilia, Reggio Emilia, Italy
| | - M Lituania
- Preconceptional and Prenatal Pathophysiology, Department of Obstetrics and Gynaecology, Ente Ospedaliero Ospedali Galliera, Genoa, Italy
| | - E Carboni
- Unified Regional Center of Prenatal Diagnosis, ASUR, S.O.D.S. Community Hospital, Loreto, Italy
| | - A Cecchi
- Unified Regional Center of Prenatal Diagnosis, ASUR, S.O.D.S. Community Hospital, Loreto, Italy
| | - W Sepulveda
- FETALMED-Maternal-Fetal Diagnostic Center, Fetal Imaging Unit, Santiago, Chile
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2
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Rocchetti G, Ghilardelli F, Carboni E, Atzori AS, Masoero F, Gallo A. Milk metabolome reveals pyrimidine and its degradation products as the discriminant markers of different corn silage-based nutritional strategies. J Dairy Sci 2022; 105:8650-8663. [PMID: 36175222 DOI: 10.3168/jds.2022-21903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 06/27/2022] [Indexed: 11/19/2022]
Abstract
The purpose of this study was to evaluate the effect of 6 different feeding systems (based on corn silage as the main ingredient) on the chemical composition of milk and to highlight the potential of untargeted metabolomics to find discriminant marker compounds of different nutritional strategies. Interestingly, the multivariate statistical analysis discriminated milk samples mainly according to the high-moisture ear corn (HMC) included in the diet formulation. Overall, the most discriminant compounds, identified as a function of the HMC, belonged to AA (10 compounds), peptides (71 compounds), pyrimidines (38 compounds), purines (15 compounds), and pyridines (14 compounds). The discriminant milk metabolites were found to significantly explain the metabolic pathways of pyrimidines and vitamin B6. Interestingly, pathway analyses revealed that the inclusion of HMC in the diet formulation strongly affected the pyrimidine metabolism in milk, determining a significant up-accumulation of pyrimidine degradation products, such as 3-ureidopropionic acid, 3-ureidoisobutyric acid, and 3-aminoisobutyric acid. Also, some pyrimidine intermediates (such as l-aspartic acid, N-carbamoyl-l-aspartic acid, and orotic acid) were found to possess a high discrimination degree. Additionally, our findings suggested that the inclusion of alfalfa silage in the diet formulation was potentially correlated with the vitamin B6 metabolism in milk, being 4-pyridoxic acid (a pyridoxal phosphate degradation product) the most significant and up-accumulated compound. Taken together, the accumulation trends of different marker compounds revealed that both pyrimidine intermediates and degradation products are potential marker compounds of HMC-based diets, likely involving a complex metabolism of microbial nitrogen based on total splanchnic fluxes from the rumen to mammary gland in dairy cows. Also, our findings highlight the potential of untargeted metabolomics in both foodomics and foodomics-based studies involving dairy products.
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Affiliation(s)
- G Rocchetti
- Department of Animal Science, Food and Nutrition (DiANA), Facoltà di Scienze Agrarie, Alimentari e Ambientali, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy.
| | - F Ghilardelli
- Department of Animal Science, Food and Nutrition (DiANA), Facoltà di Scienze Agrarie, Alimentari e Ambientali, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy
| | - E Carboni
- Department of Animal Science, Food and Nutrition (DiANA), Facoltà di Scienze Agrarie, Alimentari e Ambientali, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy
| | - A S Atzori
- Department of Agriculture Science, University of Sassari, 07100 Sassari, Italy
| | - F Masoero
- Department of Animal Science, Food and Nutrition (DiANA), Facoltà di Scienze Agrarie, Alimentari e Ambientali, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy
| | - A Gallo
- Department of Animal Science, Food and Nutrition (DiANA), Facoltà di Scienze Agrarie, Alimentari e Ambientali, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy
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Carboni E, Sestito S, Lucente M, Morrone A, Zampini L, Chimenz R, Ceravolo MD, De Sarro R, Ceravolo G, Calabrò MP, Parisi F, Moricca MT, Pensabene L, Musolino D, Concolino D. Dilated cardiomyopathy in mucolipidosis type 2. J BIOL REG HOMEOS AG 2020; 34:71-77. SPECIAL ISSUE: FOCUS ON PEDIATRIC CARDIOLOGY. [PMID: 33000604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Mucolipidosis II and III are lysosomal storage diseases caused by pathogenetic mutations in GNPTAB and GNPTG genes which cause an impaired activity of the lysosomal hydrolase N-acetylglucosamine- 1-phosphotransferase, a key enzyme in the synthesis of the mannose-6-phosphate targeting signals on lysosomal enzymes. Patients with MLII alpha/beta present coarse facial features, cessation of statural growth, important skeletal manifestations, impaired neuromotor development and cardiorespiratory involvement. All children appear to have cardiac involvement, but severe dilated cardiomyopathy is uncommon. In this report we describe the case of an 11-month-old girl who is affected by a MLII. Analysis of the GNPTAB gene identified at a heterozygous level the previously described gene variants c. 2693delA p(Lys898Serfs*13) and c. 2956C>T p(Arg986Cys). Her main clinical features were coarse face with gingival hypertrophy, dysostosis multiplex, recurrent respiratory infection and an early onset of dilated cardiomyopathy, an uncommon feature for MLII. To our knowledge, dilated cardiomyopathy has been previously described in literature in only two cases of MLII and in one patient affected by MLIII.
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Affiliation(s)
- E Carboni
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - S Sestito
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - M Lucente
- Neonatology and Neonatal Intensive Care Unit, "Pugliese-Ciaccio" Hospital, Catanzaro, Italy
| | - A Morrone
- Paediatric Neurology Unit and Laboratories, Neuroscience Department, A. Meyer Children's Hospital, Florence, Italy
| | - L Zampini
- Department of Clinical Sciences, Polytechnic University of the Marche, Ancona, Italy
| | - R Chimenz
- Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", Unit of Pediatric Nephrology, University of Messina, "G. Martino" Policlinic, Italy
| | - M D Ceravolo
- Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", Unit of Emergency Pediatrics, University of Messina, Policlinico "G. Martino" Messina, Italy
| | - R De Sarro
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - G Ceravolo
- Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", Unit of Pediatric Nephrology and Rheumatology with Dialysis, University of Messina, "G. Martino" Policlinic, Italy
| | - M P Calabrò
- Department of Human Pathology in Adult and Developmental Age "Gaetano Barresi", Unit of Pediatric Cardiology, University of Messina, "G. Martino" Policlinic, Italy
| | - F Parisi
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - M T Moricca
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - L Pensabene
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - D Musolino
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - D Concolino
- Pediatric Unit, Department of Science of Health, University Magna Graecia of Catanzaro, Catanzaro, Italy
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Zoratto F, Palombelli G, Ruocco L, Carboni E, Laviola G, Sadile A, Adriani W, Canese R. Enhanced limbic/impaired cortical-loop connection onto the hippocampus of NHE rats: Application of resting-state functional connectivity in a preclinical ADHD model. Behav Brain Res 2017; 333:171-178. [DOI: 10.1016/j.bbr.2017.06.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 05/18/2017] [Accepted: 06/15/2017] [Indexed: 12/26/2022]
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Fontanesi L, Pancaldi M, Carboni E, Beretti F, Paganelli A, Righini G, Davoli R, Ravaglia S, Salvi A, Russo V. A new system for animal products traceability and authentication: use of DNA analysis of natural tracers and example of application to dry cured hams. Italian Journal of Animal Science 2016. [DOI: 10.4081/ijas.2007.1s.136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- L. Fontanesi
- Dipartimento di Protezione e Valorizzazione Agroalimentare, Università di Bologna, Italy
| | | | | | - F. Beretti
- Dipartimento di Scienze Entomologiche, Fitopatologiche, Microbiologiche Agrarie e Zootecniche, Università Palermo, Italy
| | | | | | - R. Davoli
- Dipartimento di Protezione e Valorizzazione Agroalimentare, Università di Bologna, Italy
| | - S. Ravaglia
- Società Italiana Sementi. S. Lazzaro di Savena, Bologna, Bologna, Bologna, Bologna, Italy
| | | | - V. Russo
- Dipartimento di Protezione e Valorizzazione Agroalimentare, Università di Bologna, Italy
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Balis D, Siomos N, Koukouli M, Clarisse L, Carboni E, Ventress L, Grainger R, Mona L, Pappalardo G. Validation of ASH Optical Depth and Layer Height from IASI using Earlinet Lidar Data. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611907006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Acquas E, Caboni P, Rosas M, Spina L, Carboni E, Peana A, Melis M. SY26-3FROM ETHANOL TO SALSOLINOL: ROLE OF METABOLISM IN THE EFFECTS OF ETHANOL. Alcohol Alcohol 2015. [DOI: 10.1093/alcalc/agv076.107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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8
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Ruocco LA, Treno C, Gironi Carnevale UA, Arra C, Boatto G, Pagano C, Tino A, Nieddu M, Michel M, Prikulis I, Carboni E, de Souza Silva MA, Huston JP, Sadile AG, Korth C. Immunization with DISC1 protein in an animal model of ADHD influences behavior and excitatory amino acids in prefrontal cortex and striatum. Amino Acids 2015; 47:637-50. [DOI: 10.1007/s00726-014-1897-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 12/09/2014] [Indexed: 12/11/2022]
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Popescu LM, Piticescu RM, Antonelli A, Rusti CF, Carboni E, Sfara C, Magnani M, Badilita V, Vasile E, Trusca R, Buruiana T. Recent advances in synthesis, characterization of hydroxyapatite/polyurethane composites and study of their biocompatible properties. J Mater Sci Mater Med 2013; 24:2491-2503. [PMID: 23877879 DOI: 10.1007/s10856-013-5005-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2012] [Accepted: 07/09/2013] [Indexed: 06/02/2023]
Abstract
The development of engineered biomaterials that mimic bone tissues is a promising research area that benefits from a growing interest. Polymers and polymer-ceramic composites are the principle materials investigated for the development of synthetic bone scaffolds thanks to their proven biocompatibility and biostability. Several polymers have been combined with calcium phosphates (mainly hydroxyapatite) to prepare nanocomposites with improved biocompatible and mechanical properties. Here, we report the hydrothermal synthesis in high pressure conditions of nanostructured composites based on hydroxyapatite and polyurethane functionalized with carboxyl and thiol groups. Cell-material interactions were investigated for potential applications of these new types of composites as coating for orthopedic implants. Physical-chemical and morphological characteristics of hydroxyapatite/polyurethane composites were evaluated for different compositions, showing their dependence on synthesis parameters (pressure, temperature). In vitro experiments, performed to verify if these composites are biocompatible cell culture substrates, showed that they are not toxic and do not affect cell viability.
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Affiliation(s)
- L M Popescu
- "Petru Poni" Institute of Macromolecular Chemistry, Iasi, Romania,
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10
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Kulkarni R, Karim FA, Glamocanin S, Janic D, Vdovin V, Ozelo M, Rageliene L, Carboni E, Laguna P, Dobaczewski G, Seremetis S, Lindblom A, Santagostino E. Results from a large multinational clinical trial (guardian™3) using prophylactic treatment with turoctocog alfa in paediatric patients with severe haemophilia A: safety, efficacy and pharmacokinetics. Haemophilia 2013; 19:698-705. [PMID: 23651313 DOI: 10.1111/hae.12165] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/28/2013] [Indexed: 12/16/2022]
Abstract
Recombinant factor VIII (rFVIII) products provide a safe and efficacious replacement therapy for prophylaxis and treatment of bleeding episodes in patients with severe haemophilia A. This multinational, open-label, non-controlled trial investigated the safety, efficacy and pharmacokinetics (PK) of turoctocog alfa, a new rFVIII product, in a paediatric population. The primary objective was to evaluate safety. A total of 31 younger children (0-5 years) and 32 older children (6-11 years), with ≥ 50 exposure days to any factor VIII (FVIII) product and no history of inhibitors, received prophylaxis with turoctocog alfa (25-50 IU kg(-1) every second day or 25-60 IU kg(-1) three times weekly). PK assessments of turoctocog alfa and the patients' previous FVIII product were performed in 28 patients. Mean exposure to turoctocog alfa was 60 exposure days per patient. This corresponds to approximately 4.5 months in the trial. None of the patients developed inhibitors (≥ 0.6 BU) and no safety concerns were raised. A total of 120 bleeding episodes (95%) were controlled with 1-2 infusions of turoctocog alfa. Based on patient reports, the success rate (defined as 'excellent' or 'good' haemostatic response) for treatment of bleeding episodes was 92%. Overall, the median annualized bleeding rate was 3.0 (interquartile range: 8.5) bleeds patient(-1) year(-1) . PK parameters were comparable between the two age groups. In conclusion, the present large global clinical trial showed that turoctocog alfa was safe, effective in treatment of bleeding episodes and had a prophylactic effect in paediatric patients.
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Affiliation(s)
- R Kulkarni
- Department of Pediatrics and Human Development, Michigan State University, East Lansing, MI 48824-7106, USA.
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Walker JC, Carboni E, Dudhia A, Grainger RG. Improved detection of sulphur dioxide in volcanic plumes using satellite-based hyperspectral infrared measurements: Application to the Eyjafjallajökull 2010 eruption. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd016810] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Carboni E, Barros V, Ibba M, Silvagni A, Mura C, Antonelli M. Prenatal restraint stress: an in vivo microdialysis study on catecholamine release in the rat prefrontal cortex. Neuroscience 2010; 168:156-66. [DOI: 10.1016/j.neuroscience.2010.03.046] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Revised: 01/13/2010] [Accepted: 03/22/2010] [Indexed: 11/25/2022]
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Ruocco LA, Carnevale UAG, Treno C, Sadile AG, Melisi D, Arra C, Ibba M, Schirru C, Carboni E. Prepuberal subchronic methylphenidate and atomoxetine induce different long-term effects on adult behaviour and forebrain dopamine, norepinephrine and serotonin in Naples high-excitability rats. Behav Brain Res 2010; 210:99-106. [PMID: 20156489 DOI: 10.1016/j.bbr.2010.02.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2010] [Accepted: 02/07/2010] [Indexed: 10/19/2022]
Abstract
The psychostimulant methylphenidate and the non-stimulant atomoxetine are two approved drugs for attention-deficit hyperactivity disorder (ADHD) therapy. The aim of this study was to investigate the long-term effects of prepuberal subchronic methylphenidate and atomoxetine on adult behaviour and the forebrain neurotransmitter and metabolite content of Naples High-Excitability (NHE) rats, a genetic model for the mesocortical variant of ADHD. Male NHE rats were given a daily intraperitoneal injection (1.0mg/kg) of methylphenidate, atomoxetine or vehicle from postnatal day 29 to 42. At postnatal day 70-75, rats were exposed to spatial novelty in the Làt and radial (Olton) mazes. Behavioural analysis for indices of horizontal, vertical, non-selective (NSA) and selective spatial attention (SSA) indicated that only methylphenidate significantly reduced horizontal activity to a different extent, i.e., 39 and 16% respectively. Moreover methylphenidate increased NSA as assessed by higher leaning duration. The high-performance liquid chromatography (HPLC) tissue content assessment of dopamine, norepinephrine, serotonin and relative metabolites in the prefrontal cortex (PFC), cortical motor area (MC), dorsal striatum (DS), ventral striatum (VS), hippocampus and mesencephalon indicated that methylphenidate decreased (i) dopamine, DOPAC, norepinephrine, MHPG, 5-HT and 5-HIAA in the PFC, (ii) dopamine, DOPAC, HVA, serotonin, 5-HIAA in the DS, (iii) dopamine, DOPAC, HVA and MHPG (but increased norepinephrine) in the VS and (iv) norepinephrine, MHPG, serotonin and 5-HIAA in the hippocampus. Atomoxetine increased dopamine and decreased MHPG in the PFC. Like methylphenidate, atomoxetine decreased dopamine, DOPAC, HVA, serotonin and 5-HIAA in the DS, but decreased MHPG in the VS. These results suggest that methylphenidate determined long-term effects on behavioural and neurochemical parameters, whereas atomoxetine affected only the latter.
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Affiliation(s)
- L A Ruocco
- Department of Exptl. Med., II University of Naples, S. Andrea delle Dame, 7, 80138 Naples, Italy
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Nanetti L, Giannubilo SR, Raffaelli F, Curzi CM, Vignini A, Moroni C, Tanase L, Carboni E, Turi A, Mazzanti L, Tranquilli AL. Nitric oxide and peroxynitrite platelet levels in women with small-for-gestational-age fetuses. BJOG 2008; 115:14-21. [PMID: 18053099 DOI: 10.1111/j.1471-0528.2007.01567.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVE The placenta produces reactive oxygen species (ROS) including nitric oxide (NO) and peroxynitrite (ONOO(-)) that have pronounced effects on placental function. Excessive ROS production may occur in pathological pregnancies, such as those complicated by small-for-gestational-age (SGA) fetuses. DESIGN The aim of the present work was to study NO and ONOO(-) levels in platelets of pregnant women with SGA fetuses compared with a control group. SETTING AND POPULATION The study was performed on 30 pregnant women with SGA fetuses (SGA group) and on 30 healthy pregnant women (appropriate-for-gestational-age [AGA] group) matched for maternal and gestational age. All women included in this study were in the third trimester of pregnancy. METHODS Platelets were isolated by differential centrifugation. NO metabolites, after enzymatic conversion followed by the Griess reaction, were measured as nitrite by spectrophotometric detection. Peroxynitrite (ONOO(-)) levels were evaluated using the fluorescence probe 2,7-dichlorofluorescein diacetate (DCFDA). MAIN OUTCOME MEASURES The following determinations were made: platelet nitric oxide and peroxynitrite levels in the SGA group and controls; inducible nitric oxide synthase (iNOS), endothelial nitric oxide synthase (eNOS) and nitrotyrosine (N-Tyr) expression in the same groups. RESULTS Our results show that both platelet NO and ONOO(-) levels were significantly higher in the SGA group than in the controls. CONCLUSION Increased platelets levels of nitric oxide and peroxynitrite might play a role in the pathophysiology of intrauterine growth restriction. Further investigations are in progress to clarify if these molecules are pathogenetic factors, an epiphenomenon or a pathophysiological marker.
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Affiliation(s)
- L Nanetti
- Institute of Biochemistry, Polytechnical University of Marche, Ancona, Italy
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Ruocco LA, Viggiano D, Pignatelli M, Iannaccone T, Rimoli MG, Melisi D, Curcio A, De Lucia S, Carboni E, Gironi Carnevale UA, de Caprariis P, Sadile AG. Galactosilated dopamine increases attention without reducing activity in C57BL/6 mice. Behav Brain Res 2007; 187:449-54. [PMID: 18063140 DOI: 10.1016/j.bbr.2007.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2007] [Accepted: 10/08/2007] [Indexed: 11/17/2022]
Abstract
Different strategies can be used to carry dopamine into the brain such as L-Dopa precursors or galactosilated form of DA (GAL-DA). The aim of this study was to investigate whether GAL-DA would reduce hyperactivity and increase non-selective attention (NSA) in a mouse model of attention deficit hyperactivity disorder (ADHD), as, i.e. C57BL/6 as did in NHE rats. Here we report that GAL-DA increases NSA in a spatial novelty in C57BL/6 mice. They received a single i.p. injection of GAL-DA (10 mg/kg or 100 mg/kg) or equimolar galactose vehicle. Another mouse strain the Swiss albino was introduced as inbred control group. Three hours after last injection mice were tested in a Làt-maze for 30-min. Behaviour was analyzed for horizontal (traveled distance) and vertical activity (orienting frequency and scanning durations) which shares cognitive and non-cognitive nature, respectively. Ten milligram per kilograms of GAL-DA, increases scanning duration in C57BL/6 mice. Thus a low dose of GAL-DA increases NSA without reducing hyperactivity in this mouse model of ADHD.
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Affiliation(s)
- L A Ruocco
- Department of Experimental Medicine, II University of Naples, Italy
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Carboni E, Spielewoy C, Vacca C, Nosten-Bertrand M, Giros B, Di Chiara G. Cocaine and amphetamine increase extracellular dopamine in the nucleus accumbens of mice lacking the dopamine transporter gene. J Neurosci 2001; 21:RC141: 1-4. [PMID: 11312315 PMCID: PMC6762548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
Behavioral and biochemical studies suggest that dopamine (DA) plays a role in the reinforcing and addictive properties of drugs of abuse. Recently, this hypothesis has been challenged on the basis of the observation that, in mice genetically lacking the plasma membrane dopamine transporter [DAT-knock out (DAT-KO)], cocaine maintained its reinforcing properties of being self-administered and inducing place preference, despite the failure to increase extracellular dopamine in the dorsal striatum. Here we report that, in DAT-KO mice, cocaine and amphetamine increase dialysate dopamine in the medial part of the nucleus accumbens. Moreover, reboxetine, a specific blocker of the noradrenaline transporter, increased DA in the nucleus accumbens of DAT-KO but not of wild-type mice; in contrast, GBR 12909, a specific blocker of the dopamine transporter, increased dialysate dopamine in the nucleus accumbens of wild-type but not of DAT-KO mice. These observations provide an explanation for the persistence of cocaine reinforcement in DAT-KO mice and support the hypothesis of a primary role of nucleus accumbens dopamine in drug reinforcement.
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Affiliation(s)
- E Carboni
- Department of Toxicology and Consiglio Nazionale delle Ricerche Center for Neuropharmacology, University of Cagliari, 09126 Cagliari, Italy
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Carboni E, Silvagni A, Rolando MT, Di Chiara G. Stimulation of in vivo dopamine transmission in the bed nucleus of stria terminalis by reinforcing drugs. J Neurosci 2000; 20:RC102. [PMID: 11027253 PMCID: PMC6772858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
Drugs of abuse preferentially increase dopamine transmission in the shell of the nucleus accumbens. This area is considered as a transition between the striatum and the extended amygdala a complex neural system that includes the central amygdala and the bed nucleus of stria terminalis, areas that, like the nucleus accumbens shell, are heavily innervated by mesolimbic dopamine neurons originating in the ventral tegmental area. Given the anatomical and neurochemical relationships and similarities with the nucleus accumbens shell it was of interest to investigate whether the dopamine transmission of the bed nucleus of stria terminalis shares with the accumbens shell the peculiar responsiveness to drugs of abuse. To this end we studied by microdialysis with concentric probes, the effect of drugs of abuse on extracellular dopamine in the bed nucleus of stria terminalis. We report that morphine, nicotine, cocaine, ethanol, and the selective dopamine uptake inhibitor GBR 12909 increase effectively and dose dependently extracellular dopamine in the bed nucleus of stria terminalis. These results indicate that the bed nucleus of stria terminalis shares with the nucleus accumbens shell a peculiar sensitivity to the dopamine stimulant actions of drugs of abuse.
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Affiliation(s)
- E Carboni
- Department of Toxicology and Consiglio Nazionale delle Ricerche Center for Neuropharmacology, University of Cagliari, 09126 Cagliari, Italy.
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Carboni E, Bortone L, Giua C, Di Chiara G. Dissociation of physical abstinence signs from changes in extracellular dopamine in the nucleus accumbens and in the prefrontal cortex of nicotine dependent rats. Drug Alcohol Depend 2000; 58:93-102. [PMID: 10669059 DOI: 10.1016/s0376-8716(99)00064-2] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The aim of the present study was to investigate the relationship between physical abstinence and changes in dopamine release in the nucleus accumbens and in the medial prefrontal cortex induced by mecamylamine and naloxone in rats chronically exposed to nicotine. The rats were implanted with osmotic minipumps (Alzet) delivering nicotine tartrate at a rate of 9 mg/kg/day (3.16 mg of free base) and 8 days later with a dialysis probe in the nucleus accumbens or in the medial prefrontal cortex. Steady-state dopamine output from the nucleus accumbens of the rats implanted with nicotine minipumps was higher than that of sham implanted rats; no differences were observed in the prefrontal cortex. In nicotine but not in sham implanted rats mecamylamine (1 mg/kg s.c.) precipitated a physical abstinence syndrome and brought dopamine output back to control values in the nucleus accumbens. In contrast mecamylamine (1 mg/kg s.c.) increased dopamine output in the medial prefrontal cortex of nicotine but not sham-implanted rats. Naloxone (2 mg/kg) precipitated a physical abstinence syndrome qualitatively similar to that produced by mecamylamine but failed to modify extracellular dopamine in the nucleus accumbens or in the prefrontal cortex of nicotine-implanted and sham-implanted rats. The results indicate that the mesolimbic and mesocortical dopamine system undergo opposite changes during mecamylamine-precipitated abstinence in rats chronically exposed to nicotine and that physical abstinence signs can be dissociated from changes in dopamine transmission.
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Affiliation(s)
- E Carboni
- Department of Toxicology, University of Cagliari, Italy.
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19
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Abstract
Neuroleptics are known to stimulate dopamine release in neostriatal terminal areas. In the present study, we have investigated by brain microdialysis in freely moving rats the effect of typical and atypical neuroleptics on dopamine transmission in the bed nucleus of stria terminalis, a dopamine terminal area belonging to the limbic system and recently assigned the so-called extended amygdala. Mean basal dialysate dopamine values were 14.3 f moles/20 microliters sample. Dopamine output in dialysates was increased dose-dependently by clozapine (max + 158%, 298%, and 461% of basal at 5, 10, and 20 mg/kg i.p., respectively), risperidone (max + 115% and 221% of basal at 1 and 3 mg/kg i.p., respectively), olanzapine (max + 138% and 235% of basal at 3 and 6 mg/kg i.p., respectively), BIMG 80 (max + 64% and 164% of basal at 3 and 5 mg/kg i.p., respectively), amperozide (max + 110% and 194% of basal at 3 and 6 mg/kg i.p., respectively). The selective dopamine D4 antagonist L-745,870 increased dialysate dopamine but at rather high doses and not as effectively as clozapine (max + 32%, 89%, and 130% of basal at 2.7, 5.4, and 10.8 mg/kg i.p., respectively). The typical neuroleptic haloperidol (0.1 and 0.5 mg/kg s.c.) and the selective D2 antagonist raclopride (0.14, 0.56, and 2.1 mg/kg s.c.), the serotonergic 5-HT2 antagonist ritanserin (0.5 and 1.5 mg/kg i.p.), and the adrenergic alpha 1 antagonist prazosin (0.91 and 2.73 mg/kg i.p.) did not affect dialysate dopamine in the bed nucleus of stria terminalis. Saline (1 ml/kg s.c. or 3 ml/kg i.p.) did not modify dialysate dopamine. Therefore, atypical neuroleptics share the ability of stimulating dopamine transmission in the bed nucleus of stria terminalis, but this property is not mimicked by any of the drug tested that selectively act on individual receptors among those that are affected by atypical neuroleptics. These observations raise the possibility that the property of increasing dopamine transmission in the bed nucleus of stria terminalis is the result of combined blockade of dopamine, serotonin, and noradrenaline receptors and that might be predictive of an atypical neuroleptic profile.
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Affiliation(s)
- E Carboni
- Department of Toxicology, University of Cagliari, Italy
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Santoro E, Carboni E, Carlini M, Sacchi M, Lepiane P, Scardamaglia F, Calisti A, Socci U. Pancreatic resections: early results and functional behaviour of the stapled pancreatic stump. J Exp Clin Cancer Res 1999; 18:299-303. [PMID: 10606173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Pancreaticoduodenectomy is the standard surgical treatment for patients with pancreatic head cancer. Morbidity and mortality rates following this procedure have constantly decreased over the past several years. Leakage of the pancreaticoenteric anastomosis is one of the most serious complications, often responsible for a fatal outcome. Several methods for the management of the pancreatic stump have been described in order to reduce the worrisome incidence of this complication, with variable results. In this series, the Authors review their experience of 75 pancreatic resections and analyze the early results and functional behaviour of 6 patients in which the pancreatic stump was stapled without pancreaticoenteric anastomosis.
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Affiliation(s)
- E Santoro
- II Department of Surgery, Regina Elena Institute for Cancer Research, Rome, Italy
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21
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Carboni E, Silvagni A, Rolando MT, Di Chiara G. Stimulation of dopamine release in the bed nucleus of stria terminalis. A trait of atypical antipsychotics? Ann N Y Acad Sci 1999; 877:707-10. [PMID: 10415689 DOI: 10.1111/j.1749-6632.1999.tb09307.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E Carboni
- Department of Toxicology, University of Cagliari, Italy.
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Di Chiara G, Tanda G, Bassareo V, Pontieri F, Acquas E, Fenu S, Cadoni C, Carboni E. Drug addiction as a disorder of associative learning. Role of nucleus accumbens shell/extended amygdala dopamine. Ann N Y Acad Sci 1999; 877:461-85. [PMID: 10415665 DOI: 10.1111/j.1749-6632.1999.tb09283.x] [Citation(s) in RCA: 173] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Conventional reinforcers phasically stimulate dopamine transmission in the nucleus accumbens shell. This property undergoes one-trial habituation consistent with a role of nucleus accumbens shell dopamine in associative learning. Experimental studies with place- and taste-conditioning paradigms confirm this role. Addictive drugs share with conventional reinforcers the property of stimulating dopamine transmission in the nucleus accumbens shell. This response, however, undergoes one-trial habituation in the case of conventional reinforcers but not of drugs. Resistance to habituation allows drugs to repetitively activate dopamine transmission in the shell upon repeated self-administration. This process abnormally facilitates associative learning, leading to the attribution of excessive motivational value to discrete stimuli or contexts predictive of drug availability. Addiction is therefore the expression of the excessive control over behavior acquired by drug-related stimuli as a result of abnormal strenghtening of stimulus-drug contingencies by nondecremental drug-induced stimulation of dopamine transmission in the nucleus accumbens shell.
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Affiliation(s)
- G Di Chiara
- Department of Toxicology, University of Cagliari, Italy
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Di Chiara G, Tanda G, Cadoni C, Acquas E, Bassareo V, Carboni E. Homologies and differences in the action of drugs of abuse and a conventional reinforcer (food) on dopamine transmission: an interpretative framework of the mechanism of drug dependence. Adv Pharmacol 1997; 42:983-7. [PMID: 9328062 DOI: 10.1016/s1054-3589(08)60911-4] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- G Di Chiara
- Department of Toxicology, University of Cagliari, Italy
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24
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Di Chiara G, Tanda G, Carboni E. Estimation of in-vivo neurotransmitter release by brain microdialysis: the issue of validity. Behav Pharmacol 1996; 7:640-657. [PMID: 11224460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Although microdialysis is commonly understood as a method of sampling low molecular weight compounds in the extracellular compartment of tissues, this definition appears insufficient to specifically describe brain microdialysis of neurotransmitters. In fact, transmitter overflow from the brain into dialysates is critically dependent upon the composition of the perfusing Ringer. Therefore, the dialysing Ringer not only recovers the transmitter from the extracellular brain fluid but is a main determinant of its in-vivo release. Two types of brain microdialysis are distinguished: quantitative micro-dialysis and conventional microdialysis. Quantitative microdialysis provides an estimate of neurotransmitter concentrations in the extracellular fluid in contact with the probe. However, this information might poorly reflect the kinetics of neurotransmitter release in vivo. Conventional microdialysis involves perfusion at a constant rate with a transmitter-free Ringer, resulting in the formation of a steep neurotransmitter concentration gradient extending from the Ringer into the extracellular fluid. This artificial gradient might be critical for the ability of conventional microdialysis to detect and resolve phasic changes in neurotransmitter release taking place in the implanted area. On the basis of these characteristics, conventional microdialysis of neurotransmitters can be conceptualized as a model of the in-vivo release of neurotransmitters in the brain. As such, the criteria of face-validity, construct-validity and predictive-validity should be applied to select the most appropriate experimental conditions for estimating neurotransmitter release in specific brain areas in relation to behaviour.
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Affiliation(s)
- G. Di Chiara
- Department of Toxicology, University of Cagliari and Consiglio Nazionale delle Ricerche Center for Neuropharmacology, Cagliari, Italy
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Abstract
Certain endogenously occurring 3 alpha-hydroxylated, 5-reduced pregnane steroids act at a specific site on the GABAA receptor complex (GRC) to modulate the effects of GABA at its receptor. Modulators that potentiate GABA at the GABAA receptor often possess anxiolytic properties. The anxiolytic potential of four 5-reduced, 3 alpha, 20-pregnanediols, differing only in the stereochemical orientation of the steroid A-ring and the 20-hydroxyl group, were tested in the Vogel test following intracerebroventricular (ICV) administration. The effects of these pregnanediols were compared to those of their 20-ketone analogues, 3 alpha-hydroxy-5 alpha-pregnan-20-one (3 alpha, 5 alpha-P) and 3 alpha-hydroxy-5 beta-pregnan-20-one (3 alpha, 5 beta-P). All four pregnanediols tested significantly enhanced punished drinking at doses ranging from 10 to 60 micrograms. The rank order of potency based on the minimum effective dose (MED) observed was 5 alpha-pregnan-3 alpha,20 alpha-diol = 5 beta-pregnan-3 alpha,20 alpha-diol > 5 beta-pregnan-3 alpha,20 beta-diol > 5 alpha-pregnan-3 alpha, 20 beta-diol. 3 alpha,5 beta-P and 3 alpha,5 alpha-P enhanced punished responding when administered at 2.5 and 5 micrograms, respectively. 3 beta,5 alpha-P which is inactive at the GRC was also inactive (up to 100 micrograms) in the Vogel test. The benzodiazepine control diazepam was efficacious when administered at 2.5 micrograms. 5 alpha-Pregnan-3 alpha,20 alpha-diol was further tested in the mouse elevated plus-maze model following systemic administration where it was found to be active in a dose range of 10-40 mg/kg IP. These results raise the possibility that in addition to 3 alpha,5 alpha-P and 3 alpha,5 beta-P, some of their endogenously occurring pregnanediol metabolites may also influence physiological processes related to anxiety via the GRC.
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Affiliation(s)
- E Carboni
- Department of Pharmacology, College of Medicine, University of California Irvine 92717, USA
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26
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Abstract
It is known that the density of peripheral benzodiazepine receptors (PBR) increases after brain damage. Astrocytes are among the cell types where PBR ligand binding has been detected and may be involved in the response to neuronal injury and regeneration. Consistent with the hypothesis, the apparent density of PBR sites in astrocytes is increased by both cytokines and neurotoxins. However, microglia, the resident macrophages which represent 5-15% of glial cell populations have not been evaluated for the presence of the PBR. In the present study, we report the presence of [3H]Ro5-4864 binding in microglial cells. In particular, we used BV-2 cells, an immortalized cell line of murine microglial cells. High affinity binding of [3H]Ro5-4864 to a single site was detected in membranes prepared from BV-2 cells (KD = 4.4 nM, Bmax = 3,800 fmoles/mg protein). Various ligands for the PBR displaced [3H]Ro5-4864 binding with the following rank order of potencies: PK11195 = Ro5-4864 > FGIN-1-27 > triazolam = diazepam > beta-pro-pyl-beta-carboline-3-carboxylate = clonazepam > lorazepam = flurazepam >> chlordiazepoxide = clorazepate. Subcellular fractionationstudies indicate that the majority of the Ro5-4864 binding sites is in the mitochondrial fraction. The remainder is found in nonmitochondrial cell fractions. The [3H]Ro5-4864 binding observed on intact cells had characteristics similar to those found on membranes. The presence of a high density of PBRs in these cells establish the basis for additional investigations into their possible functional role, if any, in the microglial response to neuronal injury.
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Affiliation(s)
- C H Park
- Department of Pharmacology, University of California Irvine 92717, USA
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Tanda G, Carboni E, Frau R, Di Chiara G. Increase of extracellular dopamine in the prefrontal cortex: a trait of drugs with antidepressant potential? Psychopharmacology (Berl) 1994; 115:285-8. [PMID: 7862908 DOI: 10.1007/bf02244785] [Citation(s) in RCA: 251] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Drugs differing in their primary mechanism of action but having in common the ability to act as antidepressants such as fluoxetine (10 mg/kg SC), clomipramine (10 mg/kg IP), imipramine (10 mg/kg IP), desipramine (10 mg/kg IP) and (+/-) 8-OHDPAT (0.03 mg/kg SC) increase extracellular concentrations of dopamine in the rat prefrontal cortex but not in the medial nucleus accumbens. Buspirone (1 mg/kg SC) increased dopamine both in the prefrontal cortex and in the nucleus accumbens. Extracellular 5HT was increased by fluoxetine, clomipramine and imipramine but not by desipramine while 8-OHDPAT and buspirone decreased it. These results raise the possibility that the property of stimulating dopamine transmission in the prefrontal cortex has a role in the antidepressant properties of these drugs.
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Affiliation(s)
- G Tanda
- Department of Toxicology, University of Cagliari, Italy
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28
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Di Chiara G, Carboni E, Morelli M, Cozzolino A, Tanda GL, Pinna A, Russi G, Consolo S. Stimulation of dopamine transmission in the dorsal caudate nucleus by pargyline as demonstrated by dopamine and acetylcholine microdialysis and Fos immunohistochemistry. Neuroscience 1993; 55:451-6. [PMID: 8377936 DOI: 10.1016/0306-4522(93)90514-g] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The effect of pargyline on dopamine neurotransmission was investigated by trans-striatal microdialysis combined with Fos immunohistochemistry. Pargyline, 75 mg/kg i.p., increased dopamine and acetylcholine output while drastically decreased dopamine deaminated metabolites. Administration of pargyline resulted in the appearance of Fos-positive nuclei distributed along a gradient around the dialysis probe. Pretreatment with the D1 antagonist SCH 23390 potentiated the effect of pargyline on dopamine output while preventing that on acetylcholine output and on Fos formation. Similarly, lack of calcium in the perfusion medium abolished the effect of pargyline on dopamine and acetylcholine output and on Fos formation. In rats not implanted with dialysis probes pargyline administration resulted in only rare Fos-positive nuclei in the dorsal caudate. The present study indicates that pargyline stimulates dopamine transmission in the dorsal caudate in the area around the dialysis probe but not distant from the fibre or in unimplanted rats. This effect appears to reflect an interaction between the drug-induced changes and those locally elicited by the probe.
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Affiliation(s)
- G Di Chiara
- Department of Toxicology, University of Cagliari, Italy
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29
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Di Chiara G, Tanda G, Frau R, Carboni E. On the preferential release of dopamine in the nucleus accumbens by amphetamine: further evidence obtained by vertically implanted concentric dialysis probes. Psychopharmacology (Berl) 1993; 112:398-402. [PMID: 7871048 DOI: 10.1007/bf02244939] [Citation(s) in RCA: 105] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Concentric dialysis probes were vertically implanted in rats in the nucleus accumbens (Acc) of one side and in the dorsal caudate-putamen (CPu) of the other side. On the day after the implant the output of dopamine was monitored and the changes elicited by d-amphetamine sulphate were compared in the two areas. Amphetamine preferentially stimulated dopamine release in the Acc in a wide range of doses (0.25, 0.5, 1.0, 2.0 mg/kg SC) when Acc probes were located in the medial aspect of the Acc. In contrast, no significant differences between the Acc and the dorsal CPu were obtained in response to amphetamine (0.5 mg/kg SC) when Acc probes were located about 0.7 mm lateral to the previous site. It is concluded that the preferential effect of amphetamine in the Acc is related to precise topographical boundaries. This in turn might be related to the existence of a sharp anatomical and functional heterogeneity within the Acc.
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Affiliation(s)
- G Di Chiara
- Department of Toxicology, University of Cagliari, Italy
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Carboni E, Tanda G, Di Chiara G. Extracellular striatal concentrations of endogenous 3,4-dihydroxyphenylalanine in the absence of a decarboxylase inhibitor: a dynamic index of dopamine synthesis in vivo. J Neurochem 1992; 59:2230-6. [PMID: 1431903 DOI: 10.1111/j.1471-4159.1992.tb10115.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Basal levels of endogenous 3,4-dihydroxyphenylalanine (DOPA) were detected by HPLC coupled with coulometric detection in dialysates from freely moving rats implanted 48-72 h earlier with transversal dialysis fibers in the dorsal caudate. Because decarboxylase inhibitor is absent in the Ringer's solution, this method allows monitoring of basal output of dopamine (DA) and 3,4-dihydroxyphenylacetic acid, as well as DOPA. Extracellular DOPA concentrations were reduced by the tyrosine hydroxylase inhibitor alpha-methylparatyrosine (200 mg/kg, i.p.) and by the dopaminergic agonist apomorphine (0.25 mg/kg, s.c.). The dopaminergic antagonist haloperidol (0.2 mg/kg, s.c.) stimulated DOPA output by about 60% over basal values. Gamma-Butyrolactone, at doses of 700 mg/kg, i.p., which are known to block dopaminergic neuronal firing and which reduce DA release, stimulated DOPA output maximally by 130% over basal values. Tetrodotoxin, which blocks DA release by blocking voltage-dependent Na+ channels, increased DOPA output maximally by 100% over basal values. The results indicate that basal DOPA can be detected and monitored in the extracellular fluid of the caudate of freely moving rats by transcerebral dialysis and can be taken as a dynamic index of DA synthesis in pharmacological conditions.
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Affiliation(s)
- E Carboni
- Department of Toxicology, University of Cagliari, Italy
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Morelli M, Carboni E, Cozzolino A, Tanda GL, Pinna A, Di Chiara G. Combined microdialysis and Fos immunohistochemistry for the estimation of dopamine neurotransmission in the rat caudate-putamen. J Neurochem 1992; 59:1158-60. [PMID: 1322970 DOI: 10.1111/j.1471-4159.1992.tb08359.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Extracellular dopamine (DA) concentrations estimated by transcerebral dialysis and D1-dependent c-fos expression, as demonstrated by Fos immunohistochemistry, were studied after blockade of DA reuptake by GBR-12909. Rats implanted with dialysis probes in the dorsal caudate-putamen did not show any Fos-positive neuronal labeling in the implanted area or in the rest of the caudate-putamen. Administration of GBR-12909 dose-dependently increased DA output in dialysates and resulted in the appearance in the caudate-putamen of Fos-positive neurons whose density was related to the dose of GBR-12909 and to the increase in extracellular concentrations of DA. The D1 antagonist SCH-23390 blocked GBR-12909-induced activation of Fos while potentiating the stimulation of DA output. The results show that following blockade of DA reuptake by GBR-12909, the induction of Fos is related to stimulation of D1 receptors by extracellular DA. Combination of brain dialysis with Fos immunohistochemistry might provide a method for estimating the functional significance of extracellular DA as measured by brain microdialysis.
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Affiliation(s)
- M Morelli
- Department of Toxicology, University of Cagliari, Italy
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Acquas E, Carboni E, de Ree RH, Da Prada M, Di Chiara G. Extracellular concentrations of dopamine and metabolites in the rat caudate after oral administration of a novel catechol-O-methyltransferase inhibitor Ro 40-7592. J Neurochem 1992; 59:326-30. [PMID: 1613509 DOI: 10.1111/j.1471-4159.1992.tb08907.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The effect of the systemic administration of a novel, orally active, catechol-O-methyltransferase (COMT) inhibitor, Ro 40-7592, on the in vivo extracellular concentrations of dopamine (DA) and its metabolites, dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA), was studied by transcerebral microdialysis in the dorsal caudate of freely moving rats. Ro 40-7592 (at doses of 3.0, 7.5, and 30 mg/kg p.o.) elicited a marked and long-lasting reduction of HVA, and at doses of 7.5 and 30 mg/kg, an increase of DOPAC output, but it failed to increase DA output. The administration of L-beta-3,4-dihydroxyphenylalanine (L-DOPA, 20 and 50 mg/kg p.o.) with a DOPA decarboxylase inhibitor (benserazide) increased both HVA and DOPAC output, but failed to modify significantly extracellular DA concentrations in dialysates; in contrast, combined administration of L-DOPA+benserazide with Ro 40-7592 (30 mg/kg p.o.) resulted in a significant increase in DA output. Ro 40-7592 prevented the L-DOPA-induced increase in HVA output and markedly potentiated the increase in DOPAC output. To investigate to what extent the increase in extracellular DA concentrations was related to an exocitotic release, tetrodotoxin (TTX) sensitivity was tested. Addition of TTX to Ringer, although abolishing DA output in the absence of L-DOPA, partially reduced it in the presence of L-DOPA+Ro 40-7592 and even more so after L-DOPA without the COMT inhibitor. The results of the present study suggest that metabolism through COMT regulates extracellular concentrations of DA formed from exogenously administered L-DOPA but not of endogenous DA.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- E Acquas
- Institute of Pharmacology and Experimental Toxicology, University of Cagliari, Italy
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33
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Affiliation(s)
- G Di Chiara
- Department of Toxicology, University of Cagliari, Italy
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Di Chiara G, Tanda GL, Frau R, Carboni E. Heterologous monoamine reuptake: lack of transmitter specificity of neuron-specific carriers. Neurochem Int 1992; 20 Suppl:231S-235S. [PMID: 1365432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
The effect of systemic administration of desmethylimipramine (DMI), an inhibitor of the noradrenaline (NA) reuptake carrier, and of GBR 12909, an inhibitor of the dopamine (DA) reuptake carrier, on the in vivo extracellular concentrations of dopamine (DA) was studied by transcerebral dialysis in the prefrontal cortex and in the dorsal caudate of freely moving rats. In the NA-rich prefrontal cortex only DMI increased extracellular DA concentrations whereas in the dorsal caudate only GBR 12909 was effective. Haloperidol increased extracellular DA concentrations more effectively in the dorsal caudate than in the prefrontal cortex. Pretreatment with DMI, which failed to modify the effect of haloperidol in the dorsal caudate, potentiated its action in the prefrontal cortex. The reverse was obtained after GBR 12909+ haloperidol in the two areas. 6-hydroxydopamine lesioning of the dorsal NA bundle prevented the ability of DMI to increase DA concentrations. The results suggest that reuptake into NA terminals is an important mechanism by which DA is cleared from the extracellular space in a NA-rich area such as the prefrontal cortex. The elevated extracellular concentrations of DA resulting from blockade of such mechanism by tricyclic antidepressants may play a role in the therapeutic effects of these drugs.
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Affiliation(s)
- G Di Chiara
- Institute of Experimental Pharmacology & Toxicology, University of Cagliari, Italy
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35
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Di Chiara G, Morelli M, Acquas E, Carboni E. Functions of dopamine in the extrapyramidal and limbic systems. Clues for the mechanism of drug actions. Arzneimittelforschung 1992; 42:231-7. [PMID: 1586394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Dopamine (DA) is a neurotransmitter which modulates the transfer of information along fast-conducting pathways at the level of two main nodal points: the ventral striatum, composed by limbic areas (nucleus accumbens, tuberculum olfactorium) and the dorsal striatum, composed by extrapyramidal nuclei (caudate-putamen). These two subdivisions of the enlarged basal ganglia, are provided with different functions; accordingly, limbic DA plays an active role in goal-oriented (motivated) behaviour; instead, extrapyramidal DA is essential for execution of learned motor programs and its impairment results in the symptoms of Parkinson's disease. Various centrally acting drugs are able to interfere with DA transmission or with other neurotransmitter systems which interact with DA. Drugs of abuse owe their incentive properties to a preferential stimulation of DA transmission at the level of the limbic dopaminergic areas. On the other hand, drugs able to block glutamatergic transmission on NMDA receptors are able to selectively potentiate the action of DA at the level of a specific type of DA-receptors, the D-1 type. Knowledge of the role of DA in the brain can provide the basis not only for understanding the mechanism of drug action but also for developing new strategies for the treatment of drug abuse and extrapyramidal disorders.
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Affiliation(s)
- G Di Chiara
- University of Cagliari, Department of Toxicology, Italy
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Longoni R, Spina L, Mulas A, Carboni E, Garau L, Melchiorri P, Di Chiara G. (D-Ala2)deltorphin II: D1-dependent stereotypies and stimulation of dopamine release in the nucleus accumbens. J Neurosci 1991; 11:1565-76. [PMID: 1646295 PMCID: PMC6575425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
In order to investigate the relative role of central delta- and mu-opioid receptors in behavior, the effects of (D-Ala2)deltorphin II, a natural delta-opioid peptide, and PL017, a beta-casomorphin derivative specific for mu receptors, were compared after local intracerebral and intraventricular administration. Intracerebral infusion of the two peptides was done bilaterally in the limbic nucleus accumbens and in the ventral and dorsal caudate putamen of freely moving rats through chronic intracerebral cannulas. After intra-accumbens infusion, the two peptides elicited marked but opposite behavioral effects: while (D-Ala2)deltorphin II evoked dose-dependent motor stimulation characterized by locomotion, sniffing, and oral stereotypies, PL017 elicited motor inhibition with rigidity and catalepsy. These effects were site specific because they could not be evoked from the ventral or from the dorsal caudate. Low doses of naloxone (0.1 mg/kg, s.c.) blocked the effects of PL017 but not those of (D-Ala2)deltorphin II, which instead were reduced by high doses of naloxone (1.0 mg/kg) and by the putative delta-antagonist naltrindole; this drug failed to affect the catalepsy induced by PL017. Therefore, while (D-Ala2)deltorphin II effects were delta-mediated, PL017 effects were mu-mediated. Blockade of dopamine D1 receptors by SCH 23390 abolished (D-Ala2)deltorphin II effects, while blockade of dopamine D2 receptors by raclopride or by haloperidol was without effect. Local application by reverse dialysis of (D-Ala2)deltorphin II (5 microM) to the accumbens resulted in a naloxone-sensitive increase of extracellular dopamine concentrations; these effects could not be evoked from the caudate, nor by PL017 in the accumbens. Intracerebroventricular administration of (D-Ala2)deltorphin II or of PL017 elicited behavioral effects qualitatively similar to those obtained from the accumbens.
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Affiliation(s)
- R Longoni
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Affiliation(s)
- E Acquas
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Carboni E, Tanda GL, Frau R, Di Chiara G. Blockade of the noradrenaline carrier increases extracellular dopamine concentrations in the prefrontal cortex: evidence that dopamine is taken up in vivo by noradrenergic terminals. J Neurochem 1990; 55:1067-70. [PMID: 2117046 DOI: 10.1111/j.1471-4159.1990.tb04599.x] [Citation(s) in RCA: 295] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The effect of systemic administration of desmethylimipramine (DMI) and oxaproptiline (OXA), two inhibitors of the noradrenaline (NA) reuptake carrier, on the in vivo extracellular concentrations of dopamine (DA) was studied by transcerebral dialysis in the prefrontal cortex and in the dorsal caudate of freely moving rats. In the NA-rich prefrontal cortex, either drug increased extracellular DA concentrations whereas in the dorsal caudate neither was effective. Haloperidol increased extracellular DA concentrations more effectively in the dorsal caudate than in the prefrontal cortex. Pre-treatment with DMI or OXA, which failed to modify the effect of haloperidol in the dorsal caudate, potentiated its action in the prefrontal cortex. 6-Hydroxydopamine lesioning of the dorsal NA bundle prevented the ability of OXA to increase DA concentrations. The results suggest that reuptake into NA terminals in an important mechanism by which DA is cleared from the extracellular space in a NA-rich area such as the prefrontal cortex. The elevated extracellular concentrations of DA resulting from blockade of such mechanism by tricyclic antidepressants may play a role in the therapeutic effects of these drugs.
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Affiliation(s)
- E Carboni
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Abstract
The effect of two 5HT3 antagonists, ICS 205-930 and MDL 72222, on drug-induced place aversion was studied in a two-compartment apparatus with a procedure including a pre-test for spontaneous preference. Naloxone (0.8 mg/kg SC), phencyclidine (2.5 mg/kg SC) and picrotoxin (2.0 mg/kg IP) paired with the preferred compartment elicited a significant place aversion. ICS 205-930 and MDL 72222 failed to modify spontaneous place preference when paired with both compartments. ICS 205-930 (30 micrograms/kg SC) paired with the preferred and, in other experiments, with the non-preferred compartment, also failed to modify spontaneous preference. ICS 205-930 (7.5, 15 and 30 micrograms/kg SC), paired with both compartments, dose-dependently reduced the place aversion induced by naloxone (0.8 mg/kg SC), phencyclidine (2.5 mg/kg SC) and picrotoxin (2.0 mg/kg IP). MDL 72222 (30 micrograms/kg SC) paired with both compartments had a similar effect. The result indicate that 5HT, via 5HT3 receptors, plays a role in the aversive properties of drug stimuli.
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Affiliation(s)
- E Acquas
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Abstract
The effect of intraperitoneal administration of tryptophan (50, 100, or 200 mg/kg) on extracellular concentrations of tryptophan, serotonin (5-hydroxytryptamine, 5-HT), and 5-hydroxyindoleacetic acid (5-HIAA) was studied in the cortex of freely moving rats by transcerebral dialysis. Rats were implanted with dialysis probes in the frontal cortex, and experiments were performed 24 h later. Tryptophan, 5-HT, and 5-HIAA were quantified in 20-min samples of dialysate by HPLC with electrochemical detection after separation on reverse-phase columns. Tryptophan administration resulted in a significant increase of tryptophan, 5-HT, and 5-HIAA levels in dialysates. The maximal increase of 5-HT and 5-HIAA output was approximately 150% over basal values. Perfusion with Ringer's solution containing tetrodotoxin (1 microM) reduced 5-HT output by 90% and prevented the increase of 5-HT and 5-HIAA content after 100 mg/kg of tryptophan. Similar results were obtained after perfusion with Ringer's solution without Ca2+. The results indicate that a tryptophan load stimulates the physiological release of 5-HT.
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Affiliation(s)
- E Carboni
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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41
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Abstract
The effects of a potent and specific antagonist of 5-HT3 receptors, ICS 205-930, on the dopamine (DA)-releasing properties of morphine (1.0 mg/kg s.c.), nicotine (0.6 mg/kg s.c.), ethanol (1.0 g/kg i.p.) and amphetamine (0.25 and 1.0 mg/kg s.c.) were studied in rats. DA release was estimated by trans-cerebral dialysis in the nucleus accumbens of freely moving rats. ICS 205-930 (15-30 micrograms/kg s.c.) failed to modify the basal output of DA and its metabolites, however, ICS 205-930 dose dependently reduced the stimulation of DA release by morphine, nicotine and ethanol. Thus, at doses of 30 micrograms/kg s.c., ICS 205-930 completely prevented the morphine-, nicotine- and ethanol-induced stimulation of DA release in the nucleus accumbens; doses of 15 micrograms/kg s.c. partially prevented the morphine-, nicotine- and ethanol-induced stimulation of DA release while doses of 7.5 micrograms/kg s.c. were ineffective. In contrast, ICS 205-930 (up to 30 micrograms/kg s.c.) failed to affect the amphetamine-induced stimulation of DA release in the nucleus accumbens. The inhibitory effects of ICS 205-930 (15 and 30 micrograms/kg s.c.) on the drug-induced stimulation of DA release could also be extended to the neuroleptic haloperidol (0.1 mg/kg s.c.). The results indicate that blockade of 5-HT3 receptors selectively prevents the stimulation of DA release induced by drugs known to stimulate the firing activity of DA neurons.
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Affiliation(s)
- E Carboni
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Acquas E, Carboni E, Leone P, Di Chiara G. SCH 23390 blocks drug-conditioned place-preference and place-aversion: anhedonia (lack of reward) or apathy (lack of motivation) after dopamine-receptor blockade? Psychopharmacology (Berl) 1989; 99:151-5. [PMID: 2572027 DOI: 10.1007/bf00442800] [Citation(s) in RCA: 163] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The influence of the D1 antagonist SCH 23390 on the motivational properties of rewarding (morphine, nicotine and diazepam) and aversive (naloxone, phencyclidine and picrotoxin) drugs was studied in the rat in a two-compartment place-conditioning paradigm, which included a pre-conditioning test for spontaneous place-preference. The specific D1 dopamine-receptor antagonist SCH 23390 (0.05 mg/kg SC), paired with both compartments or, separately, with the preferred or with the non-preferred compartment, failed to affect the spontaneous unconditioned preference of the animal. Pairing of morphine (1.0 mg/kg SC), nicotine (0.6 mg/kg SC) or diazepam (1.0 mg/kg IP) with the less preferred compartment induced significant preference for that compartment. Pairing of SCH 23390 (0.05 mg/kg SC) with both compartments completely blocked the place-preference induced by morphine, nicotine and diazepam. Naloxone (0.8 mg/kg SC), phencyclidine (2.5 mg/kg SC) or picrotoxin (2.0 mg/kg IP) paired with the preferred compartment elicited place-aversion. Pairing of SCH 23390 (0.05 mg/kg SC) with both compartments abolished also the place-aversion induced by naloxone, phencyclidine and picrotoxin. The results indicate that blockade of dopamine transmission blocks the motivational properties of rewarding as well as aversive stimuli. It is suggested that neuroleptics rather than simply blocking the rewarding impact of positive reinforcers (anhedonia, lack of pleasure) exert a more general influence on conditioned behaviour by blocking the affective impact of negative as well as positive reinforcers (apathy, lack of motivation).
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Affiliation(s)
- E Acquas
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Abstract
The transcerebral dialysis method has been utilized for measuring extracellular brain concentrations of serotonin and 5-hydroxyindolacetic acid. Dialysis fibres were implanted transversally in the rat frontal cortex and perfused by Ringer. Serotonin and 5-hydroxyindolacetic acid were quantified by reverse phase high performance liquid chromatography with electrochemical detection. Experiments were performed in freely-moving rats 20-24 h after the implant of the fibre. Basal output of serotonin and 5-hydroxyindolacetic acid was 0.12 and 22.8 pmol in 20 min, respectively. The output of serotonin was calcium-dependent and tetrodotoxin-sensitive (1 micron in the Ringer) while was stimulated by veratridine (50 microns) and by high concentrations of K+ (60 and 100 mM). Serotonin output was increased in a concentration-dependent manner by chlorimipramine (1-10 microM) in the Ringer; this drug stimulated serotonin release also when administered s.c. (20 mg/kg) in a tetrodotoxin-sensitive manner. The irreversible monoamine-oxidase inhibitor pargyline (75 mg/kg, i.p.) strongly stimulated serotonin output while reduced 5-hydroxyindolacetic acid output. A proposed serotonin releaser, fenfluramine (25 mg/kg, s.c.), stimulated serotonin release and this effect was strongly potentiated by local application of tetrodotoxin (1 microM). Agonists of serotonin receptors such as lisuride (0.03 mg/kg, s.c.), 8-hydroxy-2-(di-n-propilamino)tetraline (0.25 mg/kg, s.c.) and 5-methoxy 3(1,2,3,6-tetrahydro-4-pyridinil)-1H indole succinate (1 mg/kg, s.c.) reduced serotonin release. It appears that brain dialysis is a suitable method for the study of serotonin release in the cortex of freely-moving rats.
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Affiliation(s)
- E Carboni
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Abstract
The effect of two potent and specific antagonists of 5HT3 receptors, ICS 205-930 and MDL 72222, on the reinforcing properties of amphetamine, morphine and nicotine was studied in rats. Drug-induced reinforcement was assessed by measuring drug-conditioned place preference. ICS 205-930 and MDL 72222 dose-dependently reduced the place preference induced by morphine (1.0 mg/kg SC). At doses of 0.030 mg/kg SC the two antagonists completely blocked morphine-induced place preference while doses of 0.015 mg/kg SC significantly reduced it. ICS 205-930 and MDL 72222 at doses of 0.030 mg/kg SC also prevented the place preference induced by nicotine (0.6 mg/kg SC). In contrast, ICS 205-930 and MDL 72222 up to doses of 0.030 mg/kg SC failed to modify the place preference elicited by amphetamine (1.0 mg/kg SC). The results indicate that 5HT3 receptors are specifically involved in the reinforcing properties of morphine and nicotine.
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Affiliation(s)
- E Carboni
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Carboni E, Imperato A, Perezzani L, Di Chiara G. Amphetamine, cocaine, phencyclidine and nomifensine increase extracellular dopamine concentrations preferentially in the nucleus accumbens of freely moving rats. Neuroscience 1989; 28:653-61. [PMID: 2710338 DOI: 10.1016/0306-4522(89)90012-2] [Citation(s) in RCA: 450] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The effect of systemically administered amphetamine, cocaine, phencyclidine and nomifensine on the extracellular concentrations of dopamine in freely moving rats was estimated by microdialysis in the nucleus accumbens and in the dorsal caudate. All the drugs tested stimulated dopamine output in both areas but more effectively in the accumbens as compared to the caudate. Low doses of cocaine (1.0 mg/kg s.c.) stimulated dopamine output only in the nucleus accumbens. Nomifensine (1.25-5.0 mg/kg s.c.) increased by a similar extent peak dopamine output in the two dopaminergic areas but the duration of the effect was longer in the accumbens as compared to the caudate. The effect of cocaine, phencyclidine and nomifensine was prevented by systemic gamma-butyrolactone (700 mg/kg i.p.) and by omitting Ca2+ from the Ringer used for dialysis, the effect of amphetamine was insensitive to these manipulations. Thus, in contrast with amphetamine, cocaine, phencyclidine and nomifensine increase synaptic dopamine concentrations in vivo by a mechanism which depends on intact activity of dopaminergic neurons and by an exocytotic process.
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Affiliation(s)
- E Carboni
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Perezzani L, Carboni E, Belelli D, Di Chiara G. Serotonin release and metabolism in rat cortex as studied by transcerebral dialysis. Pharmacol Res Commun 1988; 20:1111-2. [PMID: 2463647 DOI: 10.1016/s0031-6989(88)80751-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- L Perezzani
- Inst. Experim. Pharmacology and Toxicology, Univ. Cagliari, Italy
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Acquas E, Carboni E, Leone P, Di Chiara G. 5-HT3 receptors antagonists block morphine- and nicotine- but not amphetamine-induced place-preference conditioning. Pharmacol Res Commun 1988; 20:1113-4. [PMID: 3212003 DOI: 10.1016/s0031-6989(88)80752-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- E Acquas
- Inst. Experimental Pharmacology and Toxicology, Univ. Cagliari, Italy
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Carboni E, Acquas E, Leone P, Perezzani L, Di Chiara G. 5-HT3 receptor antagonists block morphine- and nicotine-induced place-preference conditioning. Eur J Pharmacol 1988; 151:159-60. [PMID: 3416924 DOI: 10.1016/0014-2999(88)90710-8] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- E Carboni
- Institute of Experimental Pharmacology and Toxicology, University of Cagliari, Italy
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Abstract
In primary cultures of cerebellar granule cells, [3H]nitrendipine binds with high affinity to a single site (KD 1 nM and Bmax 20 fmol/mg protein). The 1,4-dihydropyridine (DHP) class of compounds such as nitrendipine, nifedipine, and BAY K 8644 displace [3H]nitrendipine binding at nanomolar concentrations. Verapamil partially inhibits whereas diltiazem slightly increases the [3H]nitrendipine binding. In these cells, the calcium influx that is induced by depolarization is very rapid and is blocked by micromolar concentrations of inorganic calcium blockers such as cadmium, cobalt, and manganese. The calcium influx resulting from cell depolarization is potentiated by BAY K 8644 and partially inhibited (approximately 40%) by nitrendipine and nifedipine. Other non-DHP voltage-sensitive calcium channel (VSCC) antagonists, such as verapamil and diltiazem, completely blocked the depolarization-induced calcium influx. This suggested that nitrendipine and nifedipine block only a certain population of VSCCs. In contrast, verapamil and diltiazem do not appear to be selective and block all of VSCCs. Perhaps some VSCCs can be allosterically modulated by the binding site for the DHPs, whereas verapamil and diltiazem may block completely the function of all VSCCs by occupying a site that differs from the DHP binding site.
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Affiliation(s)
- E Carboni
- Fidia Georgetown Institute for the Neurosciences, Georgetown University, Washington, D.C. 20007
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Morelli M, Carboni E, Devoto S, Di Chiara G. 6-Hydroxydopamine lesions reduce specific [3H]sulpiride binding in the rat substantia nigra: direct evidence for the existence of nigral D-2 autoreceptors. Eur J Pharmacol 1987; 140:99-104. [PMID: 3113987 DOI: 10.1016/0014-2999(87)90639-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
[3H]Sulpiride bound to substantia nigra homogenates in a saturable manner and with a pharmacological profile typical of a specific D-2 ligand. Unilateral 6-OH-dopamine (DA) lesions of the nigrostriatal DA neurons reduced by 27-46% the Bmax of the specific [3H]sulpiride binding in substantia nigra homogenates depending on the time after 6-OHDA lesion and significantly increased the Bmax in the caudate. KDs remained unchanged in both areas. The localization of specific [3H]sulpiride binding and its reduction in the substantia nigra of the 6-OHDA-lesioned side were confirmed by quantitative autoradiography. The results provide evidence for the existence of D-2 autoreceptors in substantia nigra.
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