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Nikolaus S, Chao OY, Henke J, Beu M, Fazari B, Almeida FR, Abdel-Hafiz L, Antke C, Hautzel H, Mamlins E, Müller HW, Huston JP, von Gall C, Giesel FL. 5-HT 1A and 5-HT 2A receptor effects on recognition memory, motor/exploratory behaviors, emotionality and regional dopamine transporter binding in the rat. Behav Brain Res 2024; 469:115051. [PMID: 38777263 DOI: 10.1016/j.bbr.2024.115051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 05/16/2024] [Accepted: 05/16/2024] [Indexed: 05/25/2024]
Abstract
Both dopamine (DA) and serotonin (5-HT) play key roles in numerous functions including motor control, stress response and learning. So far, there is scarce or conflicting evidence about the effects of 5-HT1A and 5-HT2A receptor (R) agonists and antagonists on recognition memory in the rat. This also holds for their effect on cerebral DA as well as 5-HT release. In the present study, we assessed the effects of the 5-HT1AR agonist 8-OH-DPAT and antagonist WAY100,635 and the 5-HT2AR agonist DOI and antagonist altanserin (ALT) on rat behaviors. Moreover, we investigated their impact on monoamine efflux by measuring monoamine transporter binding in various regions of the rat brain. After injection of either 8-OH-DPAT (3 mg/kg), WAY100,635 (0.4 mg/kg), DOI (0.1 mg/kg), ALT (1 mg/kg) or the respective vehicle (saline, DMSO), rats underwent an object and place recognition memory test in the open field. Upon the assessment of object exploration, motor/exploratory parameters and feces excretion, rats were administered the monoamine transporter radioligand N-o-fluoropropyl-2b-carbomethoxy-3b-(4-[123I]iodophenyl)-nortropane ([123I]-FP-CIT; 8.9 ± 2.6 MBq) into the tail vein. Regional radioactivity accumulations in the rat brain were determined post mortem. Compared vehicle, administration of 8-OH-DPAT impaired memory for place, decreased rearing behavior, and increased ambulation as well as head-shoulder movements. DOI administration led to a reduction in rearing behavior but an increase in head-shoulder motility relative to vehicle. Feces excretion was diminished after ALT relative to vehicle. Dopamine transporter (DAT) binding was increased in the caudateputamen (CP), but decreased in the nucleus accumbens (NAC) after 8-OH-DPAT relative to vehicle. Moreover, DAT binding was decreased in the NAC after ALT relative to vehicle. Findings indicate that 5-HT1AR inhibition and 5-HT2AR activation may impair memory for place. Furthermore, results imply associations not only between recognition memory, motor/exploratory behavior and emotionality but also between the respective parameters and the levels of available DA in CP and NAC.
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MESH Headings
- Animals
- Dopamine Plasma Membrane Transport Proteins/metabolism
- Male
- Recognition, Psychology/drug effects
- Recognition, Psychology/physiology
- Exploratory Behavior/drug effects
- Exploratory Behavior/physiology
- Rats
- Receptor, Serotonin, 5-HT1A/metabolism
- Receptor, Serotonin, 5-HT1A/drug effects
- Receptor, Serotonin, 5-HT2A/metabolism
- Receptor, Serotonin, 5-HT2A/drug effects
- Motor Activity/drug effects
- Motor Activity/physiology
- Brain/metabolism
- Brain/drug effects
- Emotions/drug effects
- Emotions/physiology
- Serotonin 5-HT1 Receptor Agonists/pharmacology
- Serotonin 5-HT2 Receptor Agonists/pharmacology
- Rats, Wistar
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Affiliation(s)
- Susanne Nikolaus
- Clinic of Nuclear Medicine, Medical Faculty, Heinrich-Heine University, Moorenstr. 5, Düsseldorf D-40225, Germany.
| | - Owen Y Chao
- Department of Biomedical Sciences, University of Minnesota Medical School, Duluth, MN 55812, USA
| | - Jan Henke
- Clinic of Nuclear Medicine, Medical Faculty, Heinrich-Heine University, Moorenstr. 5, Düsseldorf D-40225, Germany
| | - Markus Beu
- Clinic of Nuclear Medicine, Medical Faculty, Heinrich-Heine University, Moorenstr. 5, Düsseldorf D-40225, Germany
| | - Benedetta Fazari
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine University, Universitätsstr. 1, Düsseldorf D-40225, Germany
| | - Filipe Rodrigues Almeida
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine University, Universitätsstr. 1, Düsseldorf D-40225, Germany
| | - Laila Abdel-Hafiz
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine University, Universitätsstr. 1, Düsseldorf D-40225, Germany
| | - Christina Antke
- Clinic of Nuclear Medicine, Medical Faculty, Heinrich-Heine University, Moorenstr. 5, Düsseldorf D-40225, Germany
| | - Hubertus Hautzel
- Clinic of Nuclear Medicine, University Hospital Essen, Hufelandstraße 55, Essen D-45122, Germany
| | - Eduards Mamlins
- Clinic of Nuclear Medicine, Medical Faculty, Heinrich-Heine University, Moorenstr. 5, Düsseldorf D-40225, Germany
| | - Hans-Wilhelm Müller
- Clinic of Nuclear Medicine, Medical Faculty, Heinrich-Heine University, Moorenstr. 5, Düsseldorf D-40225, Germany
| | - Joseph P Huston
- Center for Behavioural Neuroscience, Institute of Experimental Psychology, Heinrich-Heine University, Universitätsstr. 1, Düsseldorf D-40225, Germany
| | - Charlotte von Gall
- Institute of Anatomy II, Medical Faculty, Heinrich-Heine University, Universitätsstr. 1, Düsseldorf D-40225, Germany
| | - Frederik L Giesel
- Clinic of Nuclear Medicine, Medical Faculty, Heinrich-Heine University, Moorenstr. 5, Düsseldorf D-40225, Germany
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Abreu GR, Zaccarelli-Magalhães J, Féba LS, Penna EY, Silva JP, Teixeira MV, Manes M, Vergara GA, Rodrigues LMA, Fukushima AR, Ricci EL, Spinosa HS. Fluoxetine alters rat's milk properties causing impact on offspring's development. Toxicol Appl Pharmacol 2024; 483:116805. [PMID: 38191078 DOI: 10.1016/j.taap.2024.116805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 12/31/2023] [Accepted: 01/03/2024] [Indexed: 01/10/2024]
Abstract
Fluoxetine is an antidepressant used to treat several conditions including postpartum depression. This disease causes cognitive, emotional, behavioral and physical changes, negatively affecting the mother, child and family life. However, fluoxetine is excreted in breast milk, causing short and long-term effects on children who were exposed to the drug during lactation, so studies that seek to uncover the consequences of these effects are needed. Thus, the aim of this study was to evaluate the effects of fluoxetine on the nutritional characteristics of milk and on growth and neurobehavioral development of the offspring on a rat model. Lactating rats were divided into 4 groups: control group and three experimental groups, which were treated with different doses of fluoxetine (1, 10 and 20 mg/kg) during the lactation. Dams body weight and milk properties were measured, as well as offspring's growth and physical and neurobehavioral development. Results showed that the use of fluoxetine during lactation decreased dam's body weight and alters milk's properties, leading to a decrease in offspring's growth until adulthood. Therefore, the use of fluoxetine during lactation needs to be cautiously evaluated, with the benefits to the mothers and the associated risk to the offspring carefully balance.
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Affiliation(s)
- Gabriel R Abreu
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva, 87, 05508-270 São Paulo, Brazil.
| | - Julia Zaccarelli-Magalhães
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva, 87, 05508-270 São Paulo, Brazil
| | - Laís S Féba
- Health Science Institute, Mackenzie Presbyterian University, Rua da Consolação, 930, 01302-907 São Paulo, Brazil
| | - Emily Y Penna
- Health Science Institute, Mackenzie Presbyterian University, Rua da Consolação, 930, 01302-907 São Paulo, Brazil
| | - Julia P Silva
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva, 87, 05508-270 São Paulo, Brazil
| | - Mariana V Teixeira
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva, 87, 05508-270 São Paulo, Brazil
| | - Marianna Manes
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva, 87, 05508-270 São Paulo, Brazil
| | - Guilherme A Vergara
- Hospital Israelita Albert Einstein, Avenida Albert Einstein, 627, 05652-000 São Paulo, Brazil
| | | | - André R Fukushima
- Centro Universitário das Américas FAM, Rua Augusta, 1508, 01304-001 São Paulo, Brazil; School of Health Sciences IGESP, Rua da Consolação, 1025, 01301-000 São Paulo, Brazil
| | - Esther L Ricci
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva, 87, 05508-270 São Paulo, Brazil; Health Science Institute, Mackenzie Presbyterian University, Rua da Consolação, 930, 01302-907 São Paulo, Brazil; School of Health Sciences IGESP, Rua da Consolação, 1025, 01301-000 São Paulo, Brazil
| | - Helenice S Spinosa
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo, Avenida Professor Doutor Orlando Marques de Paiva, 87, 05508-270 São Paulo, Brazil
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