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Han L, Lu SN, Nishimura T, Kobayashi K. Regulatory roles of dopamine D2 receptor in milk protein production and apoptosis in mammary epithelial cells. Exp Cell Res 2024; 439:114090. [PMID: 38740167 DOI: 10.1016/j.yexcr.2024.114090] [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: 02/02/2024] [Revised: 05/02/2024] [Accepted: 05/10/2024] [Indexed: 05/16/2024]
Abstract
Dopamine D2 receptors (D2Rs) play crucial roles in regulating diverse physiological functions of the central nervous system and peripheral organs. D2Rs are also expressed in mammary glands. However, which cell types express D2Rs and whether they are involved in milk production remains unclear. The present findings revealed that D2Rs are expressed in the apical regions of the lateral membranes of mammary epithelial cells (MECs) in lactating mice. We also investigated the effects of the D2R agonist bromocriptine and/or antagonist domperidone on intracellular cAMP levels, milk protein production, and apoptosis in a lactation culture model of MECs that produce major milk components like lactating MECs in vivo. We found that bromocriptine decreased intracellular cAMP levels, whereas domperidone dose-dependently neutralized this effect. Bromocriptine also inhibited casein and lactoferrin production and suppressed activities of STAT5 and glucocorticoid receptors (GRs). Domperidone neutralized the inhibition of casein production as well as STAT5 and GR inactivation induced by bromocriptine. Furthermore, D2R activation by bromocriptine induced apoptosis and inactivated ERK, a signaling molecule responsible for promoting cell proliferation and survival. Domperidone attenuated ERK inactivation and apoptosis induced by bromocriptine. These findings suggest that D2Rs play regulatory roles in milk protein production and apoptosis in MECs.
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Affiliation(s)
- Liang Han
- Laboratory of Cell and Tissue Biology, Research Faculty of Agriculture, Hokkaido University, North 9, West 9, 060-8589, Sapporo, Japan.
| | - Shan-Ni Lu
- Laboratory of Cell and Tissue Biology, Research Faculty of Agriculture, Hokkaido University, North 9, West 9, 060-8589, Sapporo, Japan.
| | - Takanori Nishimura
- Laboratory of Cell and Tissue Biology, Research Faculty of Agriculture, Hokkaido University, North 9, West 9, 060-8589, Sapporo, Japan.
| | - Ken Kobayashi
- Laboratory of Cell and Tissue Biology, Research Faculty of Agriculture, Hokkaido University, North 9, West 9, 060-8589, Sapporo, Japan.
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Sudakov S, Bogdanova N. Involvement of Peripheral Opioid Receptors in the Realization of Food Motivation Into Eating Behavior. Front Behav Neurosci 2021; 14:600920. [PMID: 33510624 PMCID: PMC7835398 DOI: 10.3389/fnbeh.2020.600920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 12/09/2020] [Indexed: 11/21/2022] Open
Abstract
The involvement of peripheral opioid receptors in the mechanisms of eating behavior is still unclear. The aim of this work was to study the role of peripheral, predominantly gastric mu and delta opioid receptors in the realization of food motivation in conditions of different energy costs for eating behavior. Experiments were performed under a between-sessions progressive ratio schedule of reinforcement in food-deprived rats. The level of food motivation was calculated using a self-developed method. Food intake, motor activity, and metabolic rate were recorded in fed and hungry animals. Results showed that intragastric administration of the mu opioid receptor agonist DAMGO led to an increase in the level of food motivation in the light variant of operant feeding behaviors. Food consumption did not change. At high costs for feeding behavior, the administration of DAMGO did not alter food motivation; however, food consumption and motor activity were reduced. Intragastric administration of the delta opioid receptor agonist DADLE did not lead to changes in the level of food motivation and physical activity, but inhibition of feeding behavior was observed in all reinforcement schedules. Three regulatory pathways of eating behavior in difficult food conditions by peripheral, predominantly gastric opioid receptors are hypothesized: environmental-inhibitory afferentations and suppression of the realization of food motivation into behavior; homeostatic-inhibitory action on food motivation; and rewarding-suppression of the anticipatory reinforcement.
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Affiliation(s)
- Sergey Sudakov
- Laboratory of Physiology of Reinforcement, P.K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
| | - Natalia Bogdanova
- Laboratory of Physiology of Reinforcement, P.K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
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Niu D, Li Z, Du Y, He S, Dong Z, Li J. Identification of a dopamine receptor in Sinonovacula constricta and its antioxidant responses. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2020; 103:103512. [PMID: 31585193 DOI: 10.1016/j.dci.2019.103512] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 09/29/2019] [Accepted: 09/30/2019] [Indexed: 06/10/2023]
Abstract
The dopamine (DA) D2 receptor is a member of the G protein-coupled receptors of organisms and plays an important role in immune system regulation. The presence of DA receptors has been widely reported in vertebrates, but few studies have been conducted in shellfish. Here, we identified a novel DA-D2 receptor gene, ScDopR2-1, in the razor clam Sinonovacula constricta. ScDopR2-1 belongs to the family of G protein-coupled receptors, containing seven hydrophobic transmembrane domains, along with 16 predicted N-glycosylation sites and 69 phosphorylation sites. A longer third intracellular loop and a shorter C-terminus in ScDopR2-1 are characteristic features of D2 receptors. ScDopR2-1 is widely expressed in tissues from adult clams, showing high expression in siphon and foot tissues. Furthermore, in response to Vibrio anguillarum challenge, ScDopR2-1 expression levels are significantly increased in liver tissue. Moreover, changes in the activities of catalase (CAT) and superoxide dismutase (SOD) also indicate that the organism causes an immune response. In summary, the results indicate that ScDopR2-1 plays a pivotal role in antioxidant responses in S. constricta.
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Affiliation(s)
- Donghong Niu
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources and College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, 201306, China; National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai, 201306, China.
| | - Zhi Li
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources and College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, 201306, China
| | - Yunchao Du
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources and College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, 201306, China
| | - Shengyao He
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources and College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, 201306, China
| | - Zhiguo Dong
- Co-innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang, 222005, China
| | - Jiale Li
- Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources and College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, 201306, China; Shanghai Engineering Research Center of Aquaculture, Shanghai, 201306, China; Co-innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang, 222005, China.
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Bhat SK, Ganesh CB. Domperidone treatment attenuates stress-induced suppression of reproduction in viviparous mosquitofish Gambusia affinis. JOURNAL OF FISH BIOLOGY 2020; 96:37-48. [PMID: 31648360 DOI: 10.1111/jfb.14183] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Accepted: 10/23/2019] [Indexed: 06/10/2023]
Abstract
The aim of this study was to determine the effect of stress on reproduction and the possible involvement of dopaminergic systems in the reproductive stress response in the mosquitofish Gambusia affinis. Exposure of fish to aquaculture stressors (four 10 min episodes of stress, each corresponding to a different stressor such as handling, chasing, frequent netting and low water levels), for a period of 30 days caused reduction in the mean numbers of stage I-IV follicles associated with lower number of pregnant females and embryos in most of the developmental stages compared with experimental controls. Besides, increase in the intensity of labelling and the per cent area of tyrosine hydroxylase (TH; a rate-limiting enzyme in the biosynthetic pathway of catecholamines)- immunoreactive (ir) neurons was observed in the preoptic area (POA) and the nucleus preopticus (NPO) regions of the brain concomitant with reduction in the labelling of gonadotropin releasing hormone-immunoreactive (GnRH-ir) fibres in the proximal pars distalis (PPD) of the pituitary gland in stressed fish compared with experimental controls. Treatment of domperidone (DOM) caused an increase in the number of stage II and V follicles and promoted pregnancy rate concomitant with an increase in the number of embryos at various developmental stages compared with those of experimental controls. Similar treatment to stressed fish caused an increase in the number of stages I-V follicles compared with those in stress alone group. The GnRH fibres showed increased immunolabelling in stress + DOM treated fish compared with stress alone fish. On the other hand, TH-immunoreactivity in the POA and the NPO regions was reduced in stress + DOM treated fish compared with stress-alone group. These results suggest that stress inhibits follicular development and subsequent hatching success through the suppression of GnRH and that the inhibition appears to be mediated through dopamine, for the first time in a viviparous fish.
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Affiliation(s)
- Shilpa K Bhat
- Department of Studies in Zoology, Karnatak University, Dharwad, India
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Sudakov SK. Physiology and Pharmacology of Positive Reinforcement. Bull Exp Biol Med 2019; 166:709-713. [PMID: 31020579 DOI: 10.1007/s10517-019-04423-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Indexed: 12/28/2022]
Abstract
An original concept of a two-stage mechanism of positive reinforcement is proposed. The first stage, "virtual" reinforcement, is formed in parallel with the action result acceptor when the result is still not achieved. At this stage, the importance of the planned result and the probability of its achievement are assessed. The greater are these indices, the stronger is "virtual" reinforcement. Hypothetically, the "virtual" reinforcement is mediated by dopamine release from nerve terminals in the mesencephalon. The "real" reinforcement (the second stage) occurs after achievement of the result. Probably, an important role in the mechanisms of the "real" reinforcement is given to endogenous opioids, cannabinoids, and GABA. Based on the advanced hypothesis on interaction between the central and peripheral subdivisions of the corresponding neurochemical systems, the review focuses on possibility of pharmacological intervention into the mechanisms of positive reinforcement by modifying activity of the peripheral opioid and dopamine receptors with the ligands that cannot cross blood-brain barrier.
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Affiliation(s)
- S K Sudakov
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia.
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Sudakov SK, Alekseeva EV, Bogdanova NG, Kolpakov AA, Nazarova GA. Anxiolytic, Psychostimulant, and Analgesic Effects of Various Volumes of Ethanol Solution in Different Concentrations, but in the Same Dose. Bull Exp Biol Med 2016; 161:1-3. [PMID: 27270926 DOI: 10.1007/s10517-016-3330-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Indexed: 11/24/2022]
Abstract
We studied the effect of ethanol (dose 2 g/kg) in various concentrations (5, 13, and 40%) and different volumes (40, 15.5, and 5 ml/kg) on the level of anxiety, locomotor activity, and pain sensitivity in rats. Administration of 40 ml/kg water to animals was followed by a significant increase in the time spent in the open arms of the elevated plus maze. Administration of water in a volume of 5 or 15.5 ml/kg had little effect on the level of anxiety. The greater was the volume of intragastrically administered ethanol, the stronger was the anxiolytic effect. The psychostimulant and analgesic effects of ethanol were more pronounced after administration of medium volumes and intermediate concentrations of ethanol-containing solutions. Since administration of these solutions cannot produce maximum blood concentration of ethanol, we believe that the observed effects are mainly related to the direct effect of ethanol on the stomach tissue.
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Affiliation(s)
- S K Sudakov
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia.
| | - E V Alekseeva
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
| | - N G Bogdanova
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
| | - A A Kolpakov
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
| | - G A Nazarova
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia
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Sudakov SK, Bogdanova NG, Kolpakov AA. Method for determining the level of food motivation in rats. Bull Exp Biol Med 2015; 158:401-3. [PMID: 25573375 DOI: 10.1007/s10517-015-2772-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Indexed: 11/27/2022]
Abstract
A new method for the quantitative evaluation of the level of food motivation was developed. This method takes into account not only the information, but also the energy component of operant feeding behavior of different intensity and effectiveness with a simultaneous study of metabolism by means of indirect calorimetry. Our experiments showed that an increase in the number of lever pressing episodes (from 1 to 8) to obtain one food granule during operant feeding behavior is accompanied by a progressive decrease in the level of food motivation. The level of food motivation remains practically unchanged with an increase in the ratio of pressing episodes to 16 and 32 (despite consumption of food).
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Affiliation(s)
- S K Sudakov
- P. K. Anokhin Research Institute of Normal Physiology, Moscow, Russia,
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Kellner M, Porseryd T, Porsch-Hällström I, Hansen SH, Olsén KH. Environmentally relevant concentrations of citalopram partially inhibit feeding in the three-spine stickleback (Gasterosteus aculeatus). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2015; 158:165-70. [PMID: 25438122 DOI: 10.1016/j.aquatox.2014.11.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 10/23/2014] [Accepted: 11/01/2014] [Indexed: 05/25/2023]
Abstract
Selective Serotonin Re-uptake Inhibitors (SSRI) are mood-altering, psychotropic drugs commonly used in the treatment of depression and other psychological illnesses. Many of them are poorly degraded in sewage treatment plants and enter the environment unaltered. In laboratory studies, they have been demonstrated to affect a wide range of behaviours in aquatic organisms. In this study we investigated the effect of a three-week exposure to 0.15 and 1.5 μg/l of the SSRI citalopram dissolved in the ambient water on the feeding behaviour in three-spine stickleback (Gasterosteus aculeatus). Feeding, measured as the number of attacks performed on a piece of frozen bloodworms during a 10-min period, was reduced by 30-40% in fish exposed to both 0.15 and 1.5 μg/l citalopram. The effects of the environmentally relevant concentration 0.15 μg/l on feeding, an important fitness characteristic, suggests that the ecological significance of environmental SSRI exposure may be pronounced.
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Affiliation(s)
- M Kellner
- Department of Natural Sciences, Environment and Technology, Södertörn University, SE-14189 Huddinge, Sweden.
| | - T Porseryd
- Department of Natural Sciences, Environment and Technology, Södertörn University, SE-14189 Huddinge, Sweden
| | - I Porsch-Hällström
- Department of Natural Sciences, Environment and Technology, Södertörn University, SE-14189 Huddinge, Sweden
| | - S H Hansen
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - K H Olsén
- Department of Natural Sciences, Environment and Technology, Södertörn University, SE-14189 Huddinge, Sweden
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