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Guérineau NC, Campos P, Le Tissier PR, Hodson DJ, Mollard P. Cell Networks in Endocrine/Neuroendocrine Gland Function. Compr Physiol 2022; 12:3371-3415. [PMID: 35578964 DOI: 10.1002/cphy.c210031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Reproduction, growth, stress, and metabolism are determined by endocrine/neuroendocrine systems that regulate circulating hormone concentrations. All these systems generate rhythms and changes in hormone pulsatility observed in a variety of pathophysiological states. Thus, the output of endocrine/neuroendocrine systems must be regulated within a narrow window of effective hormone concentrations but must also maintain a capacity for plasticity to respond to changing physiological demands. Remarkably most endocrinologists still have a "textbook" view of endocrine gland organization which has emanated from 20th century histological studies on thin 2D tissue sections. However, 21st -century technological advances, including in-depth 3D imaging of specific cell types have vastly changed our knowledge. We now know that various levels of multicellular organization can be found across different glands, that organizational motifs can vary between species and can be modified to enhance or decrease hormonal release. This article focuses on how the organization of cells regulates hormone output using three endocrine/neuroendocrine glands that present different levels of organization and complexity: the adrenal medulla, with a single neuroendocrine cell type; the anterior pituitary, with multiple intermingled cell types; and the pancreas with multiple intermingled cell types organized into distinct functional units. We give an overview of recent methodologies that allow the study of the different components within endocrine systems, particularly their temporal and spatial relationships. We believe the emerging findings about network organization, and its impact on hormone secretion, are crucial to understanding how homeostatic regulation of endocrine axes is carried out within endocrine organs themselves. © 2022 American Physiological Society. Compr Physiol 12:3371-3415, 2022.
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Affiliation(s)
| | - Pauline Campos
- College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK
| | - Paul R Le Tissier
- Centre for Discovery Brain Sciences, University of Edinburgh, Edinburgh, Scotland, UK
| | - David J Hodson
- Institute of Metabolism and Systems Research (IMSR), University of Birmingham, Edgbaston, UK.,Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, UK.,COMPARE University of Birmingham and University of Nottingham Midlands, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), NIHR Oxford Biomedical Research Centre, Churchill Hospital, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Patrice Mollard
- IGF, University of Montpellier, CNRS, INSERM, Montpellier, France
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Paré P, Reales G, Paixão-Côrtes VR, Vargas-Pinilla P, Viscardi LH, Fam B, Pissinatti A, Santos FR, Bortolini MC. Molecular evolutionary insights from PRLR in mammals. Gen Comp Endocrinol 2021; 309:113791. [PMID: 33872604 DOI: 10.1016/j.ygcen.2021.113791] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 04/02/2021] [Accepted: 04/13/2021] [Indexed: 12/12/2022]
Abstract
Prolactin (PRL) is a pleiotropic neurohormone secreted by the mammalian pituitary gland into the blood, thus reaching many tissues and organs beyond the brain. PRL binds to its receptor, PRLR, eliciting a molecular signaling cascade. This system modulates essential mammalian behaviors and promotes notable modifications in the reproductive female tissues and organs. Here, we explore how the intracellular domain of PRLR (PRLR-ICD) modulates the expression of the PRLR gene. Despite differences in the reproductive strategies between eutherian and metatherian mammals, there is no clear distinction between PRLR-ICD functional motifs. However, we found selection signatures that showed differences between groups, with many conserved functional elements strongly maintained through purifying selection across the class Mammalia. We observed a few residues under relaxed selection, the levels of which were more pronounced in Eutheria and particularly striking in primates (Simiiformes), which could represent a pre-adaptive genetic element protected from purifying selection. Alternative, new motifs, such as YLDP (318-321) and others with residues Y283 and Y290, may already be functional. These motifs would have been co-opted in primates as part of a complex genetic repertoire related to some derived adaptive phenotypes, but these changes would have no impact on the primordial functions that characterize the mammals as a whole and that are related to the PRL-PRLR system.
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Affiliation(s)
- Pamela Paré
- Laboratório de Evolução Humana e Molecular, Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Guillermo Reales
- Laboratório de Evolução Humana e Molecular, Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Cambridge Institute of Therapeutic Immunology & Infectious Disease (CITIID), Jeffrey Cheah Biomedical Centre, Cambridge Biomedical Campus, University of Cambridge, Puddicombe Way, Cambridge CB2 0AW, UK; Department of Medicine, University of Cambridge School of Clinical Medicine, Cambridge Biomedical Campus, Cambridge CB2 0QQ, UK
| | - Vanessa R Paixão-Côrtes
- Laboratório de Biologia Evolutiva e Genômica (LABEG), Programa de Pós-Graduação em Biodiversidade e Evolução, Instituto de Biologia, Universidade Federal da Bahia (UFBA), Salvador, BA, Brazil
| | - Pedro Vargas-Pinilla
- Laboratório de Evolução Humana e Molecular, Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil; Faculdade de Medicina de Ribeirão Preto, Departamento de Bioquímica e Imunologia, Universidade de São Paulo, Ribeirão Preto, SP, Brazil
| | - Lucas Henriques Viscardi
- Laboratório de Evolução Humana e Molecular, Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | - Bibiana Fam
- Laboratório de Evolução Humana e Molecular, Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil
| | | | - Fabrício R Santos
- Laboratório de Biodiversidade e Evolução Molecular, Departamento de Genética, Ecologia e Evolução da Universidade Federal de Minas Gerais (UFMG), Belo-Horizonte, MG, Brazil.
| | - Maria Cátira Bortolini
- Laboratório de Evolução Humana e Molecular, Programa de Pós-Graduação em Genética e Biologia Molecular, Departamento de Genética, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
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Zamora-Moratalla A, Martín ED. Prolactin enhances hippocampal synaptic plasticity in female mice of reproductive age. Hippocampus 2020; 31:281-293. [PMID: 33285014 PMCID: PMC7983975 DOI: 10.1002/hipo.23288] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 11/17/2020] [Accepted: 11/20/2020] [Indexed: 01/27/2023]
Abstract
Dynamic signaling between the endocrine system (ES) and the nervous system (NS) is essential for brain and body homeostasis. In particular, reciprocal interaction occurs during pregnancy and motherhood that may involve changes in some brain plasticity processes. Prolactin (PRL), a hormone with pleiotropic effects on the NS, promotes maternal behavior and has been linked to modifications in brain circuits during motherhood; however, it is unclear whether PRL may regulate synaptic plasticity. Therefore, the main aim of the present work was to determine the cellular and molecular mechanisms triggered by PRL that regulate synaptic plasticity in the hippocampus. By analyzing extracellular recordings in CA3‐CA1 synapses of hippocampal slices, we report that PRL modifies short and long‐term synaptic plasticity in female mice of reproductive age, but not in sexually immature females or adult males. This effect is carried out through mechanisms that include participation of GABAA receptors and activation of the JAK2‐mediated signaling pathway. These findings show for the first time how PRL enhances the synaptic strength in hippocampal circuits and that this effect is sexually dimorphic, which would influence complex brain processes in physiological conditions like pregnancy and lactation.
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Affiliation(s)
- Alfonsa Zamora-Moratalla
- Laboratory of Neurophysiology and Synaptic Plasticity, Instituto Cajal, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Eduardo D Martín
- Laboratory of Neurophysiology and Synaptic Plasticity, Instituto Cajal, Consejo Superior de Investigaciones Científicas, Madrid, Spain
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Gustafson P, Ladyman SR, McFadden S, Larsen C, Khant Aung Z, Brown RSE, Bunn SJ, Grattan DR. Prolactin receptor-mediated activation of pSTAT5 in the pregnant mouse brain. J Neuroendocrinol 2020; 32:e12901. [PMID: 33000513 DOI: 10.1111/jne.12901] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 08/10/2020] [Accepted: 08/19/2020] [Indexed: 12/12/2022]
Abstract
Pregnancy represents a period of remarkable adaptive physiology throughout the body, with many of these important adaptations mediated by changes in gene transcription in the brain. A marked activation of the transcription factor signal transducer and activator of transcription 5 (STAT5) has been described in the brain during pregnancy and likely drives some of these changes. We aimed to investigate the physiological mechanism causing this increase in phosphorylated STAT5 (pSTAT5) during pregnancy. In various tissues, STAT5 is known to be activated by a number of different cytokines, including erythropoietin, growth hormone and prolactin. Because the lactogenic hormones that act through the prolactin receptor (PRLR), prolactin and its closely-related placental analogue placental lactogen, are significantly increased during pregnancy, we hypothesised that this receptor was primarily responsible for the pregnancy-induced increase in pSTAT5 in the brain. By examining temporal changes in plasma prolactin levels and the pattern of pSTAT5 immunoreactivity in the hypothalamus during early pregnancy, we found that the level of pSTAT5 was sensitive to circulating levels of endogenous prolactin. Using a transgenic model to conditionally delete PRLRs from forebrain neurones (Prlrlox/lox /CamK-Cre), we assessed the relative contribution of the PRLR to the up-regulation of pSTAT5 in the brain of pregnant mice. In the absence of PRLRs on most forebrain neurones, a significant reduction in pSTAT5 was observed throughout the hypothalamus and amygdala in late pregnancy, confirming that PRLR is key in mediating this response. The exception to this was the hypothalamic paraventricular nucleus, where only 17% of pSTAT5 immunoreactivity during pregnancy was in PRLR-expressing cells. Taken together, these data indicate that, although there are region-specific mechanisms involved, lactogenic activity through the PRLR is the primary signal activating STAT5 in the brain during pregnancy.
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Affiliation(s)
- Papillon Gustafson
- Centre for Neuroendocrinology, University of Otago, Dunedin, New Zealand
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Sharon R Ladyman
- Centre for Neuroendocrinology, University of Otago, Dunedin, New Zealand
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Auckland, New Zealand
| | - Sarah McFadden
- Centre for Neuroendocrinology, University of Otago, Dunedin, New Zealand
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Caroline Larsen
- Centre for Neuroendocrinology, University of Otago, Dunedin, New Zealand
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Zin Khant Aung
- Centre for Neuroendocrinology, University of Otago, Dunedin, New Zealand
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Rosemary S E Brown
- Centre for Neuroendocrinology, University of Otago, Dunedin, New Zealand
- Department of Physiology, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - Stephen J Bunn
- Centre for Neuroendocrinology, University of Otago, Dunedin, New Zealand
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
| | - David R Grattan
- Centre for Neuroendocrinology, University of Otago, Dunedin, New Zealand
- Department of Anatomy, School of Biomedical Sciences, University of Otago, Dunedin, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Auckland, New Zealand
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Sumption LA, Garay SM, John RM. Low serum placental lactogen at term is associated with postnatal symptoms of depression and anxiety in women delivering female infants. Psychoneuroendocrinology 2020; 116:104655. [PMID: 32247203 DOI: 10.1016/j.psyneuen.2020.104655] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 02/07/2020] [Accepted: 03/16/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND Placental endocrine insufficiency may increase the risk of depression and anxiety during pregnancy and/or after birth. This study investigated the association between serum human placental lactogen (hPL) and measures of perinatal mental health, accounting for selective serotonin-reuptake inhibitor (SSRI) usage. METHOD Caucasian women with singleton, term pregnancies recruited at their pre-surgical appointment prior to an elective caesarean section (ELCS) were studied. Serum hPL levels were measured by ELISA in maternal blood collected at the pre-surgical appointment. Depression and anxiety scores were derived from Edinburgh Postnatal Depression Scale (EPDS) and the trait subscale of the State-Trait Anxiety Inventory (STAI) questionnaires completed at recruitment and three postnatal time points. Data was analysed by unadjusted and adjusted multiple linear regression. RESULTS In adjusted linear regressions, term maternal serum hPL levels were negatively associated with postnatal EPDS and STAI score ten weeks postnatal for mothers who had girls (B= -.367, p = .022, 95% CI -.679, -.056; and B= -.776, p = .030, 95% CI -1.475, -.077 respectively). Excluding women prescribed SSRIs strengthened the relationship at 10 weeks and uncovered an earlier association between hPL and mood scores within one week of delivery (EPDS B= -.357, p = .041, 95 % CI -.698, -.015; and STAI B= -.737, p = .027, 95 % CI -1.387, -.086). In mothers who had boys, there were no associations between hPL and mood scores at any time point. CONCLUSION Low hPL at term associated with postnatal depression and anxiety symptoms exclusively in mothers of girls. Insufficiency in hPL may contribute to maternal mood symptoms.
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Affiliation(s)
- Lorna A Sumption
- Biomedicine Division, School of Biosciences, Cardiff University, Cardiff, CF10 3AX, United Kingdom
| | - Samantha M Garay
- Biomedicine Division, School of Biosciences, Cardiff University, Cardiff, CF10 3AX, United Kingdom
| | - Rosalind M John
- Biomedicine Division, School of Biosciences, Cardiff University, Cardiff, CF10 3AX, United Kingdom.
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Dose-Response Relationships between Breastfeeding and Postpartum Weight Retention Differ by Pre-Pregnancy Body-Mass Index in Taiwanese Women. Nutrients 2020; 12:nu12041065. [PMID: 32290407 PMCID: PMC7231130 DOI: 10.3390/nu12041065] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/09/2020] [Accepted: 04/10/2020] [Indexed: 11/26/2022] Open
Abstract
Postpartum weight retention (PWR) is a risk factor for future obesity. The role of breastfeeding in reducing PWR is not fully understood. We examined the relationship between PWR and the duration of exclusive/partial breastfeeding in 52,367 postpartum women from 2012–2016 Taiwan national breastfeeding surveys. The women were interviewed at 7–14 months postpartum. Non-linear models were fit to examine the association between PWR and breastfeeding duration. PWR adjusted means and 95% confidence intervals were plotted and compared for the duration of exclusive/partial breastfeeding in the total sample and between pre-pregnancy body-mass index (BMI) groups (underweight, normal, overweight, and obese). Women who breastfed exclusively for >30 days showed significantly lower PWR than those who did not breastfeed and those who breastfed partially for the same duration, thereafter each additional duration of 30 days being associated with an average of 0.1–0.2 kg less PWR. Women who breastfed partially for 120 days showed lower PWR than those who did not or those who ceased to breastfeed, thereafter each additional duration of 30 days being associated with an average of 0.1 kg less PWR. Duration of breastfeeding needed to achieve significantly less PWR differed between pre-pregnancy BMI groups, but the effect of exclusive breastfeeding appeared earlier in the normal weight group. Women with obesity who breastfed exclusively for >30 or partially for >180 days, had lower PWR than non-obese groups. The observed dose–response relationship between breastfeeding duration and PWR supports the “every feeding matters” approach in breastfeeding promotion. The larger effect of exclusive and partial breastfeeding on PWR in women with obesity may draw special attention of breastfeeding promotion.
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Szczesna M, Kirsz K, Misztal T, Zieba DA. Pregnancy-induced changes in the transcript levels of prolactin receptor and its suppressor in the ovine hypothalamus and adenohypophysis. Reprod Domest Anim 2019; 55:21-28. [PMID: 31626709 DOI: 10.1111/rda.13576] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 10/03/2019] [Accepted: 10/12/2019] [Indexed: 11/28/2022]
Abstract
The aim of this study was to analyse changes in the abundance of prolactin (PRL) receptor (PRLR) and suppressor of cytokine signalling-3 (SOCS-3) mRNA in the ventro-/dorsomedial nucleus (VMH/DMH) and arcuate nucleus (ARC) of the hypothalamus as well as in the median eminence (ME) and adenohypophysis (AP) in sheep at 30, 60, 90 and 120 d of pregnancy compared to non-pregnant animals. In the VMH/DMH, PRLR transcripts were detected only in non-pregnant ewes. In the ARC, the abundances of PRLR mRNA were higher in pregnant sheep on days 30 (p < .01), 90 (p < .01) and 120 (p < .05) than in non-pregnant sheep. In contrast, the expression of PRLR mRNA in the ME was lower (p < .01) in pregnant ewes at days 30 and 60 than in non-pregnant ewes and was undetectable at later stages of gestation. In all studied stages of pregnancy except day 60, the abundance of PRLR mRNA was higher (p < .01) in the ARC than in the AP, while in non-pregnant sheep, there were no differences (p ≥ .05) in the transcript levels between these two tissues. In non-pregnant ewes, the abundance of SOCS-3 mRNA in the AP was lower than that in any other studied tissue (p < .05-p < .01). In conclusion, the observed changes in PRLR and SOCS-3 mRNA abundance in the hypothalamus and AP during pregnancy may be important components of the mechanisms regulating the action of PRL in energy homeostasis and neuroendocrine interactions within the hypothalamic-pituitary axis.
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Affiliation(s)
- Malgorzata Szczesna
- Department of Animal Biotechnology, Faculty of Animal Sciences, University of Agriculture, Krakow, Poland
| | - Katarzyna Kirsz
- Department of Animal Biotechnology, Faculty of Animal Sciences, University of Agriculture, Krakow, Poland
| | - Tomasz Misztal
- Department of Animal Physiology, The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jablonna, Poland
| | - Dorota A Zieba
- Department of Animal Biotechnology, Faculty of Animal Sciences, University of Agriculture, Krakow, Poland
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Gutiérrez J, Gazzano A, Pirrone F, Sighieri C, Mariti C. Investigating the Role of Prolactin as a Potential Biomarker of Stress in Castrated Male Domestic Dogs. Animals (Basel) 2019; 9:E676. [PMID: 31547279 PMCID: PMC6770094 DOI: 10.3390/ani9090676] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 09/09/2019] [Accepted: 09/10/2019] [Indexed: 01/26/2023] Open
Abstract
Prolactin has been recently regarded as a potential biomarker of both acute and chronic stress in several species. Since only few studies until now have focussed on domestic dogs, this study was aimed at evaluating whether prolactin, cortisol and stress behaviour correlated with each other in sheltered dogs. Both cortisol and prolactin analysis were performed in serum samples through a hormone-specific ELISA kit. For each dog, a stress score was calculated by summing the number of occurrences of stress-related behaviours. The presence/absence of fear during the time spent in the collection room was also scored for each individual. Results revealed a weak negative correlation between cortisol and prolactin levels. Neither of the hormones was correlated with the stress score, nor did their values seem to be influenced by showing fear in the collection room. The weak negative correlation found between cortisol and prolactin values agrees with results obtained in other studies, indicating that prolactin response might be an alternative to cortisol response. This, together with the high serum prolactin levels compared to those reported by other authors for healthy domestic dogs, may indicate that prolactin might be a good biomarker of chronic stress, and although further studies are needed to better understand the potential role of prolactin in the evaluation of canine welfare.
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Affiliation(s)
- Jara Gutiérrez
- Department of Veterinary Sciences, University of Pisa, 56124 Pisa, Italy; (A.G.); (C.S.); (C.M.)
| | - Angelo Gazzano
- Department of Veterinary Sciences, University of Pisa, 56124 Pisa, Italy; (A.G.); (C.S.); (C.M.)
| | - Federica Pirrone
- Department of Veterinary Sciences, University of Milano, 26900 Milan, Italy;
| | - Claudio Sighieri
- Department of Veterinary Sciences, University of Pisa, 56124 Pisa, Italy; (A.G.); (C.S.); (C.M.)
| | - Chiara Mariti
- Department of Veterinary Sciences, University of Pisa, 56124 Pisa, Italy; (A.G.); (C.S.); (C.M.)
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Augustine RA, Knowles PJ, Khant Aung Z, Grattan DR, Ladyman SR. Impaired hypothalamic leptin sensitivity in pseudopregnant rats treated with chronic prolactin to mimic pregnancy. J Neuroendocrinol 2019; 31:e12702. [PMID: 30803074 DOI: 10.1111/jne.12702] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 01/27/2019] [Accepted: 02/20/2019] [Indexed: 02/04/2023]
Abstract
Pregnancy in rodents is associated with hyperphagia, increased fat deposition, elevated leptin concentrations and insensitivity to the satiety action of leptin. To investigate the hormonal mechanisms involved in the development of this state of pregnancy-induced leptin resistance, we have used a pseudopregnancy rat model. We have previously demonstrated that pseudopregnant rats have a normal feeding response to leptin, although, if pseudopregnancy is extended using chronic i.c.v. ovine prolactin infusion along with progesterone implants, then leptin no longer suppresses food intake. The present study aimed to investigate the effect of chronically high lactogen levels, as seen in mid-pregnancy, on leptin-induced activation of hypothalamic Janus kinase/signal transducer and activator of transcription (JAK/STAT) signal transduction and mRNA expression of leptin (LepR-B) and prolactin (Prlr-L) receptors, using pseudopregnant rats chronically infused with ovine prolactin. Groups of virgin (dioestrous) and pseudopregnant rats were treated with chronic i.c.v. infusion of either prolactin (2.5 μg μL-1 h-1 for 5 days) or vehicle (artificial cerebrospinal fluid [aCSF]) via a minipump connected to a cannula surgically implanted into the lateral ventricle. Rats were fasted overnight and then received an i.c.v. injection of leptin (400 ng) or vehicle (aCSF) and were perfused 30 minutes later. In chronic vehicle-infused pseudopregnant rats, i.c.v. leptin increased the number of phosphorylated STAT3 positive cells in the arcuate nucleus and ventromedial nucleus (VMH) of the hypothalamus, similar to all acute-leptin treated virgin groups. This effect of leptin, however, was not observed in the pseudopregnant rats that were chronically infused with prolactin. A quantitative polymerase chain reaction analysis also showed decreased expression of LepR-B in the arcuate and VMH nuclei, as well as decreased Prlr-L in the arcuate nucleus of prolactin-infused "extended pseudopregnancy" rats. These data suggest that the attenuation of the leptin-induced suppression of food intake caused by chronically high lactogen levels in pseudopregnant rats is associated with impaired leptin-induced activation of the JAK/STAT pathway in specific hypothalamic nuclei.
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Affiliation(s)
- Rachael A Augustine
- Centre for Neuroendocrinology and Department of Physiology, University of Otago, Dunedin, New Zealand
| | - Penelope J Knowles
- Centre for Neuroendocrinology and Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - Zin Khant Aung
- Centre for Neuroendocrinology and Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - David R Grattan
- Centre for Neuroendocrinology and Department of Anatomy, University of Otago, Dunedin, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, Auckland, New Zealand
| | - Sharon R Ladyman
- Centre for Neuroendocrinology and Department of Anatomy, University of Otago, Dunedin, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, Auckland, New Zealand
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10
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Gutiérrez J, Gazzano A, Torracca B, Meucci V, Mariti C. Determination of Prolactin in Canine Saliva: Is it Possible to Use a Commercial ELISA kit? Animals (Basel) 2019; 9:E418. [PMID: 31277511 PMCID: PMC6680982 DOI: 10.3390/ani9070418] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/24/2019] [Accepted: 07/02/2019] [Indexed: 11/16/2022] Open
Abstract
Prolactin has been reported to be a remarkable index of stress response, both acute and chronic, in several species. The use of biological matrixes other than blood is receiving increasing interest in the study of hormones, due to the lower invasiveness in collection. This research aimed to investigate the possibility of using a commercial ELISA (enzyme-linked immunosorbent assay) kit for measuring canine prolactin in blood for the quantification of canine prolactin in saliva. Study 1 consisted of a validation protocol, using saliva samples collected from lactating and non-lactating dogs. Study 2 was conducted to investigate a possible correlation between prolactin concentration in saliva and plasma in sheltered dogs by using the same kit. Prolactin values were reliably read only when they came from blood samples, not from saliva, but tended to be low in most of the cases. Study 1 showed that saliva had a matrix effect. In study 2, saliva prolactin levels were low and in 42.9% of cases, not readable. No correlation between prolactin values in plasma and saliva was found (ρ=0.482; p=0.274). These findings suggested that the determination of prolactin in dog saliva through an ELISA kit created for measuring prolactin in dog blood was unreliable.
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Affiliation(s)
- Jara Gutiérrez
- Dipartimento di ScienzeVeterinarie, Università di Pisa, 56124 Pisa, Italy.
| | - Angelo Gazzano
- Dipartimento di ScienzeVeterinarie, Università di Pisa, 56124 Pisa, Italy
| | - Beatrice Torracca
- Dipartimento di ScienzeVeterinarie, Università di Pisa, 56124 Pisa, Italy
| | - Valentina Meucci
- Dipartimento di ScienzeVeterinarie, Università di Pisa, 56124 Pisa, Italy
| | - Chiara Mariti
- Dipartimento di ScienzeVeterinarie, Università di Pisa, 56124 Pisa, Italy
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Muñoz-Mayorga D, Guerra-Araiza C, Torner L, Morales T. Tau Phosphorylation in Female Neurodegeneration: Role of Estrogens, Progesterone, and Prolactin. Front Endocrinol (Lausanne) 2018; 9:133. [PMID: 29643836 PMCID: PMC5882780 DOI: 10.3389/fendo.2018.00133] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 03/14/2018] [Indexed: 01/01/2023] Open
Abstract
Sex differences are important to consider when studying different psychiatric, neurodevelopmental, and neurodegenerative disorders, including Alzheimer's disease (AD). These disorders can be affected by dimorphic changes in the central nervous system and be influenced by sex-specific hormones and neuroactive steroids. In fact, AD is more prevalent in women than in men. One of the main characteristics of AD is the formation of neurofibrillary tangles, composed of the phosphoprotein Tau, and neuronal loss in specific brain regions. The scope of this work is to review the existing evidence on how a set of hormones (estrogen, progesterone, and prolactin) affect tau phosphorylation in the brain of females under both physiological and pathological conditions.
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Affiliation(s)
- Daniel Muñoz-Mayorga
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, Mexico
| | - Christian Guerra-Araiza
- Unidad de Investigación Médica en Farmacología, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - Luz Torner
- Centro de Investigación Biomédica de Michoacán, Instituto Mexicano del Seguro Social, Morelia, Mexico
| | - Teresa Morales
- Departamento de Neurobiología Celular y Molecular, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, Mexico
- *Correspondence: Teresa Morales,
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Maternal prolactin during late pregnancy is important in generating nurturing behavior in the offspring. Proc Natl Acad Sci U S A 2017; 114:13042-13047. [PMID: 29158391 DOI: 10.1073/pnas.1621196114] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Although maternal nurturing behavior is extremely important for the preservation of a species, our knowledge of the biological underpinnings of these behaviors is insufficient. Here we show that the degree of a mother's nurturing behavior is regulated by factors present during her own fetal development. We found that Cin85-deficient (Cin85-/-) mother mice had reduced pituitary hormone prolactin (PRL) secretion as a result of excessive dopamine signaling in the brain. Their offspring matured normally and produced their own pups; however, nurturing behaviors such as pup retrieval and nursing were strongly inhibited. Surprisingly, when WT embryos were transplanted into the fallopian tubes of Cin85-/- mice, they also exhibited inhibited nurturing behavior as adults. Conversely, when Cin85-/- embryos were transplanted into the fallopian tubes of WT mice, the resultant pups exhibited normal nurturing behaviors as adults. When PRL was administered to Cin85-/- mice during late pregnancy, a higher proportion of the resultant pups exhibited nurturing behaviors as adults. This correlates with our findings that neural circuitry associated with nurturing behaviors was less active in pups born to Cin85-/- mothers, but PRL administration to mothers restored neural activity to normal levels. These results suggest that the prenatal period is extremely important in determining the expression of nurturing behaviors in the subsequent generation, and that maternal PRL is one of the critical factors for expression. In conclusion, perinatally secreted maternal PRL affects the expression of nurturing behaviors not only in a mother, but also in her pups when they have reached adulthood.
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13
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Dadousis C, Pegolo S, Rosa GJM, Bittante G, Cecchinato A. Genome-wide association and pathway-based analysis using latent variables related to milk protein composition and cheesemaking traits in dairy cattle. J Dairy Sci 2017; 100:9085-9102. [PMID: 28843680 DOI: 10.3168/jds.2017-13219] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 07/16/2017] [Indexed: 12/19/2022]
Abstract
The aim of this study was to perform genome-wide associations (GWAS) and gene-set enrichment analyses with protein composition and cheesemaking-related latent variables (factors; F) in a cohort of 1,011 Italian Brown Swiss cows. Factor analysis was applied to identify latent structures of 26 phenotypes related to bovine milk quantity and quality, protein fractions [αS1-, αS2-, β-, and κ-casein (CN), β-lactoglobulin, and α-lactalbumin (α-LA)], coagulation and curd firming at time t (CFt) measures, and cheese properties [cheese yield (%CY) and nutrients recovery in the curd] of individual cows. Ten orthogonal F were extracted, explaining 74% of the original variability. Factor 1%CY underlined the %CY characteristics, F2CFt was related to the CFt process parameters, F3Yield was considered as descriptor of milk and solids yield, whereas F4Cheese N underscored the presence of nitrogenous compounds (N) into the cheese. Four more F were related to the milk caseins (F5αS1-β-CN, F7β-κ-CN, F8αS2-CN, and F9αS1-CN-Ph) and 1 F was linked to the whey protein (F10α-LA); 1 F underlined the udder health status (F6Udder health). All cows were genotyped with the Illumina BovineSNP50 Bead Chip v.2 (Illumina Inc., San Diego, CA). Single marker regression GWAS were fitted. Gene-set enrichment analysis was run on GWAS results, using the Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway databases, to reveal ontologies or pathways associated with the F. All F but F3Yield showed significance in GWAS. Signals in 10 Bos taurus autosomes (BTA) were detected. High peaks on BTA6 (∼87 Mbp) were found for F6β-κ-CN, F5αS1-β-CN, and at the tail of BTA11 (∼104 Mbp) for F4Cheese N. Gene-set enrichment analyses showed significant results (false discovery rate at 5%) for F8αS2-CN, F1%CY, F4Cheese N, and F10α-LA. For F8αS2-CN, 33 Gene Ontology terms and 3 Kyoto Encyclopedia of Genes and Genomes categories were enriched, including terms related to ion transport and homeostasis, neuron function or part, and GnRH signaling pathway. Our results support the feasibility of factor analysis as a dimension reduction technique in genomic studies and evidenced a potential key role of αS2-CN in milk quality and composition.
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Affiliation(s)
- Christos Dadousis
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy
| | - Sara Pegolo
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy
| | - Guilherme J M Rosa
- Department of Animal Sciences and Department of Biostatistics and Medical Informatics, University of Wisconsin, Madison 53706
| | - Giovanni Bittante
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy
| | - Alessio Cecchinato
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy.
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14
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El-Mokadem M, El-Din AN, Ramadan T, Rashad A, Taha T, Samak M. Manipulation of reproductive seasonality using melatonin implantation in Anglo-Nubian does treated with controlled internal drug release and equine chorionic gonadotropin during the nonbreeding season. J Dairy Sci 2017; 100:5028-5039. [DOI: 10.3168/jds.2016-12240] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 02/22/2017] [Indexed: 11/19/2022]
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15
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Dadousis C, Pegolo S, Rosa GJM, Gianola D, Bittante G, Cecchinato A. Pathway-based genome-wide association analysis of milk coagulation properties, curd firmness, cheese yield, and curd nutrient recovery in dairy cattle. J Dairy Sci 2016; 100:1223-1231. [PMID: 27988128 DOI: 10.3168/jds.2016-11587] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 10/20/2016] [Indexed: 01/02/2023]
Abstract
It is becoming common to complement genome-wide association studies (GWAS) with gene-set enrichment analysis to deepen the understanding of the biological pathways affecting quantitative traits. Our objective was to conduct a gene ontology and pathway-based analysis to identify possible biological mechanisms involved in the regulation of bovine milk technological traits: coagulation properties, curd firmness modeling, individual cheese yield (CY), and milk nutrient recovery into the curd (REC) or whey loss traits. Results from 2 previous GWAS studies using 1,011 cows genotyped for 50k single nucleotide polymorphisms were used. Overall, the phenotypes analyzed consisted of 3 traditional milk coagulation property measures [RCT: rennet coagulation time defined as the time (min) from addition of enzyme to the beginning of coagulation; k20: the interval (min) from RCT to the time at which a curd firmness of 20 mm is attained; a30: a measure of the extent of curd firmness (mm) 30 min after coagulant addition], 6 curd firmness modeling traits [RCTeq: RCT estimated through the CF equation (min); CFP: potential asymptotic curd firmness (mm); kCF: curd-firming rate constant (% × min-1); kSR: syneresis rate constant (% × min-1); CFmax: maximum curd firmness (mm); and tmax: time to CFmax (min)], 3 individual CY-related traits expressing the weight of fresh curd (%CYCURD), curd solids (%CYSOLIDS), and curd moisture (%CYWATER) as a percentage of weight of milk processed and 4 milk nutrient and energy recoveries in the curd (RECFAT, RECPROTEIN, RECSOLIDS, and RECENERGY calculated as the % ratio between the nutrient in curd and the corresponding nutrient in processed milk), milk pH, and protein percentage. Each trait was analyzed separately. In total, 13,269 annotated genes were used in the analysis. The Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway databases were queried for enrichment analyses. Overall, 21 Gene Ontology and 17 Kyoto Encyclopedia of Genes and Genomes categories were significantly associated (false discovery rate at 5%) with 7 traits (RCT, RCTeq, kCF, %CYSOLIDS, RECFAT, RECSOLIDS, and RECENERGY), with some being in common between traits. The significantly enriched categories included calcium signaling pathway, salivary secretion, metabolic pathways, carbohydrate digestion and absorption, the tight junction and the phosphatidylinositol pathways, as well as pathways related to the bovine mammary gland health status, and contained a total of 150 genes spanning all chromosomes but 9, 20, and 27. This study provided new insights into the regulation of bovine milk coagulation and cheese ability that were not captured by the GWAS.
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Affiliation(s)
- C Dadousis
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy
| | - S Pegolo
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy
| | - G J M Rosa
- Department of Animal Sciences, University of Wisconsin, Madison 53706; Department of Biostatistics and Medical Informatics, University of Wisconsin, Madison 53706
| | - D Gianola
- Department of Animal Sciences, University of Wisconsin, Madison 53706; Department of Biostatistics and Medical Informatics, University of Wisconsin, Madison 53706
| | - G Bittante
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy
| | - A Cecchinato
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro, Italy.
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16
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Garland T, Zhao M, Saltzman W. Hormones and the Evolution of Complex Traits: Insights from Artificial Selection on Behavior. Integr Comp Biol 2016; 56:207-24. [PMID: 27252193 PMCID: PMC5964798 DOI: 10.1093/icb/icw040] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Although behavior may often be a fairly direct target of natural or sexual selection, it cannot evolve without changes in subordinate traits that cause or permit its expression. In principle, changes in endocrine function could be a common mechanism underlying behavioral evolution because they are well positioned to mediate integrated responses to behavioral selection. More specifically, hormones can influence both motivational (e.g., brain) and performance (e.g., muscles) components of behavior simultaneously and in a coordinated fashion. If the endocrine system is often "used" as a general mechanism to effect responses to selection, then correlated responses in other aspects of behavior, life history, and organismal performance (e.g., locomotor abilities) should commonly occur because any cell with appropriate receptors could be affected. Ways in which behavior coadapts with other aspects of the phenotype can be studied directly through artificial selection and experimental evolution. Several studies have targeted rodent behavior for selective breeding and reported changes in other aspects of behavior, life history, and lower-level effectors of these organismal traits, including endocrine function. One example involves selection for high levels of voluntary wheel running, one aspect of physical activity, in four replicate High Runner (HR) lines of mice. Circulating levels of several hormones (including insulin, testosterone, thyroxine, triiodothyronine) have been characterized, three of which-corticosterone, leptin, and adiponectin-differ between HR and control lines, depending on sex, age, and generation. Potential changes in circulating levels of other behaviorally and metabolically relevant hormones, as well as in other components of the endocrine system (e.g., receptors), have yet to be examined. Overall, results to date identify promising avenues for further studies on the endocrine basis of activity levels.
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Affiliation(s)
- Theodore Garland
- *Department of Biology, University of California, Riverside, Riverside, CA 92506, USA
| | - Meng Zhao
- *Department of Biology, University of California, Riverside, Riverside, CA 92506, USA
| | - Wendy Saltzman
- *Department of Biology, University of California, Riverside, Riverside, CA 92506, USA
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Abstract
Successfully rearing young places multiple demands on the mammalian female. These are met by a wide array of alterations in maternal physiology and behavior that are coordinated with the needs of the developing young, and include adaptations in neuroendocrine systems not directly involved in maternal behavior or lactation. In this article, attenuations in the behavioral and neuroendocrine responses to stressors, the alterations in metabolic pathways facilitating both increased food intake and conservation of energy, and the changes in fertility that occur postpartum are described. The mechanisms underlying these processes as well as the factors that contribute to them and the relative contributions of these stimuli at different times postpartum are also reviewed. The induction and maintenance of the adaptations observed in the postpartum maternal brain are dependent on mother-young interaction and, in most cases, on suckling stimulation and its consequences for the hormonal profile of the mother. The peptide hormone prolactin acting on receptors within the brain makes a major contribution to changes in metabolic pathways, suppression of fertility and the attenuation of the neuroendocrine response to stress during lactation. Oxytocin is also released, both into the circulation and in some hypothalamic nuclei, in response to suckling stimulation and this hormone has been implicated in the decrease in anxiety behavior seen in the early postpartum period. The relative importance of these hormones changes across lactation and it is becoming increasingly clear that many of the adaptations to motherhood reviewed here reflect the outcome of multiple influences. © 2016 American Physiological Society. Compr Physiol 6:1493-1518, 2016.
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Affiliation(s)
- Barbara Woodside
- Center for Studies in Behavioral Neurobiology, Department of Psychology, Concordia University, Montreal, Quebec, Canada
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18
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Penadés R, García-Rizo C, Bioque M, González-Rodríguez A, Cabrera B, Mezquida G, Bernardo M. The search for new biomarkers for cognition in schizophrenia. SCHIZOPHRENIA RESEARCH-COGNITION 2015; 2:172-178. [PMID: 29114461 PMCID: PMC5609637 DOI: 10.1016/j.scog.2015.10.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The search for biomarkers in cognition has been the focus of a large part of the research on patients suffering from schizophrenia. The scientific literature is heterogeneous, and few studies establishing an integrative model of pathogenesis and therapeutic response are available in this field. In this review, we aimed to summarize three essential aspects correlated with cognitive performance: 1) the relationship between inflammation and cognition in schizophrenia, 2) the role of prolactin in cognition, and 3) the association between cognition and neurotrophic factors, particularly brain-derived neurotrophic factor (BDNF). Several studies support the association of inflammatory markers with cognitive status in schizophrenia. In recent decades, the development of effective therapies for cognitive impairment in schizophrenia has focused on the search for anti-inflammatory and immunomodulatory medications. Conversely, the implications of prolactin and its functions in cognition, the transition to psychosis and the diagnosis and prognosis of schizophrenia have been established independent of antipsychotic treatment. With regard to neurotrophic factors, a recent study has correlated BDNF levels with cognitive recovery in schizophrenic patients treated with cognitive remediation. We conclude that although there is a diversity of biomarkers focused on cognitive function in schizophrenia, BDNF is the biomarker that has accumulated the vast majority of evidence in the current literature.
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Affiliation(s)
- Rafael Penadés
- Barcelona Clinic Schizophrenia Unit (BCSU).,Hospital Clínic Barcelona.,University of Barcelona.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS).,Centro de Investigación en Red de Salud Mental (CIBERSAM)
| | - Clemente García-Rizo
- Barcelona Clinic Schizophrenia Unit (BCSU).,Hospital Clínic Barcelona.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS).,Centro de Investigación en Red de Salud Mental (CIBERSAM)
| | - Miquel Bioque
- Barcelona Clinic Schizophrenia Unit (BCSU).,Hospital Clínic Barcelona.,Centro de Investigación en Red de Salud Mental (CIBERSAM)
| | | | - Bibiana Cabrera
- Barcelona Clinic Schizophrenia Unit (BCSU).,Centro de Investigación en Red de Salud Mental (CIBERSAM)
| | - Gisela Mezquida
- Barcelona Clinic Schizophrenia Unit (BCSU).,Centro de Investigación en Red de Salud Mental (CIBERSAM)
| | - Miquel Bernardo
- Barcelona Clinic Schizophrenia Unit (BCSU).,Hospital Clínic Barcelona.,University of Barcelona.,Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS).,Centro de Investigación en Red de Salud Mental (CIBERSAM)
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19
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Penadés R, Garcia-Rizo C, Bioque M, González-Rodríguez A, Cabrera B, Mezquida G, Bernardo M. Búsqueda De Nuevos Biomarcadores De La Cognición En Esquizofrenia. Schizophr Res Cogn 2015. [DOI: 10.1016/j.scog.2015.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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20
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Lou MF, Zhang XY, Fu RS, Wang DH. Effects of dietary fiber content on energetics in nonreproductive and reproductive Brandt’s voles (Lasiopodomys brandtii). CAN J ZOOL 2015. [DOI: 10.1139/cjz-2014-0243] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Food quality can affect many physiological characteristics in small mammals. Reproduction is a highly energy-demanding period especially for the females to produce and feed their offspring. We hypothesized that energy intake was constrained at different levels in nonreproductive and reproductive females and thus they adopted diverse energy strategies in response to diet changes. Here, we tested the effects of low fiber diet (3.5% vs. 12.4%) on energy intake and thermogenesis in nonreproductive and reproductive Brandt’s voles (Lasiopodomys brandtii (Radde, 1861)), a herbivorous species. We found that the voles decreased food intake while keeping a stable digestible energy intake (DEI) in response to the low fiber diet, but DEI was increased in reproductive voles at peak lactation. Uncoupling protein 1 content in brown adipose tissue decreased in nonreproductive voles, but was stable in reproductive voles on the low fiber diet. Litter mass on day 18 of age tended to increase in the low fiber group compared with that in the control group. Our findings demonstrate that the voles have a target intake to maintain energy balance when diet composition changes and energy intake may be constrained at a high level for the reproductive voles to improve their offspring’s fitness.
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Affiliation(s)
- Mei-Fang Lou
- State Key Laboratory of Integrated Management of Pest Insect and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
- College of Life Science, Shandong Normal University, Ji’nan 250014, People’s Republic of China
| | - Xue-Ying Zhang
- State Key Laboratory of Integrated Management of Pest Insect and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
| | - Rong-Shu Fu
- College of Life Science, Shandong Normal University, Ji’nan 250014, People’s Republic of China
| | - De-Hua Wang
- State Key Laboratory of Integrated Management of Pest Insect and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China
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21
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22
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Catanese MC, Suvorov A, Vandenberg LN. Beyond a means of exposure: a new view of the mother in toxicology research. Toxicol Res (Camb) 2015. [DOI: 10.1039/c4tx00119b] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Toxicological studies generally view pregnant animals as a conduit through which gestational exposure of offspring to chemicals can be achieved, allowing for the study of developmental toxicity.
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Affiliation(s)
- Mary C. Catanese
- Program in Neuroscience & Behaviour
- University of Massachusetts – Amherst
- Amherst
- USA
| | - Alexander Suvorov
- Program in Neuroscience & Behaviour
- University of Massachusetts – Amherst
- Amherst
- USA
- Division of Environmental Health Sciences
| | - Laura N. Vandenberg
- Program in Neuroscience & Behaviour
- University of Massachusetts – Amherst
- Amherst
- USA
- Division of Environmental Health Sciences
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23
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Sandini TM, Udo MS, Reis‐Silva TM, Bernardi MM, Spinosa HDS. Prenatal exposure to integerrimine N‐oxide impaired the maternal care and the physical and behavioral development of offspring rats. Int J Dev Neurosci 2014; 36:53-63. [DOI: 10.1016/j.ijdevneu.2014.05.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 04/24/2014] [Accepted: 05/05/2014] [Indexed: 12/22/2022] Open
Affiliation(s)
- Thaísa M. Sandini
- Department of Clinical and Toxicological AnalysesFaculty of Pharmaceutical SciencesUniversity of São PauloAv. Prof. Dr. Lineu Prestes, 58005508‐000São PauloBrazil
| | - Mariana S.B. Udo
- Department of Clinical and Toxicological AnalysesFaculty of Pharmaceutical SciencesUniversity of São PauloAv. Prof. Dr. Lineu Prestes, 58005508‐000São PauloBrazil
| | - Thiago M. Reis‐Silva
- Department of NeuroscienceInstitute of PsychologyUniversity of São PauloAv. Prof. Dr. Melo de Morais, 172105508‐030São PauloBrazil
| | - Maria Martha Bernardi
- Graduate Program of Environmental and Experimental Pathology and Graduate Program DentistryPaulista University, UNIPRua Dr. Bacelar, 121204026‐002São PauloBrazil
| | - Helenice de S. Spinosa
- Department of PathologySchool of Veterinary MedicineUniversity of Sao PauloAv. Prof. Dr. Orlando Marques de Paiva, 8705508 270São PauloBrazil
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24
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Babb JA, Carini LM, Spears SL, Nephew BC. Transgenerational effects of social stress on social behavior, corticosterone, oxytocin, and prolactin in rats. Horm Behav 2014; 65:386-93. [PMID: 24657520 PMCID: PMC4076950 DOI: 10.1016/j.yhbeh.2014.03.005] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 03/04/2014] [Accepted: 03/12/2014] [Indexed: 01/08/2023]
Abstract
Social stressors such as depressed maternal care and family conflict are robust challenges which can have long-term physiological and behavioral effects on offspring and future generations. The current study investigates the transgenerational effects of an ethologically relevant chronic social stress on the behavior and endocrinology of juvenile and adult rats. Exposure to chronic social stress during lactation impairs maternal care in F0 lactating dams and the maternal care of the F1 offspring of those stressed F0 dams. The overall hypothesis was that the male and female F2 offspring of stressed F1 dams would display decreased social behavior as both juveniles and adults and that these behavioral effects would be accompanied by changes in plasma corticosterone, prolactin, and oxytocin. Both the female and male F2 offspring of dams exposed to chronic social stress displayed decreased social behavior as juveniles and adults, and these behavioral effects were accompanied by decreases in basal concentrations of corticosterone in both sexes, as well as elevated juvenile oxytocin and decreased adult prolactin in the female offspring. The data support the conclusion that social stress has transgenerational effects on the social behavior of the female and male offspring which are mediated by changes in the hypothalamic-pituitary-adrenal axis and hypothalamic-pituitary-gonadal axis. Social stress models are valuable resources in the study of the transgenerational effects of stress on the behavioral endocrinology of disorders such as depression, anxiety, autism, and other disorders involving disrupted social behavior.
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Affiliation(s)
- Jessica A Babb
- Department of Biomedical Sciences, Tufts University Cummings School of Veterinary Medicine, North Grafton, MA 01536, USA
| | - Lindsay M Carini
- Department of Biomedical Sciences, Tufts University Cummings School of Veterinary Medicine, North Grafton, MA 01536, USA
| | - Stella L Spears
- Department of Biomedical Sciences, Tufts University Cummings School of Veterinary Medicine, North Grafton, MA 01536, USA
| | - Benjamin C Nephew
- Department of Biomedical Sciences, Tufts University Cummings School of Veterinary Medicine, North Grafton, MA 01536, USA.
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25
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Nephew B, Murgatroyd C. The role of maternal care in shaping CNS function. Neuropeptides 2013; 47:371-8. [PMID: 24210943 PMCID: PMC3874801 DOI: 10.1016/j.npep.2013.10.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Revised: 10/07/2013] [Accepted: 10/09/2013] [Indexed: 10/26/2022]
Abstract
Maternal care involves the consistent and coordinated expression of a variety of behaviours over an extended period of time, and adverse changes in maternal care can have profound impacts on the CNS and behaviour of offspring. This complex behavioural pattern depends on a number of integrated neuroendocrine mechanisms. This review will discuss the use of animal models in the study of the role of maternal care in shaping CNS function, the contributions of corticosteroid releasing hormone, vasopressin, oxytocin, and prolactin in this process, the molecular mechanisms involved, and the translational relevance of this research.
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Affiliation(s)
- Benjamin Nephew
- Tufts University Cummings School of Veterinary Medicine, Biomedical Sciences, 200 Wesboro Rd., Peabody Pavilion, North Grafton, MA 01536, UNITED STATES, 508-641-0865,
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26
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Carini LM, Nephew BC. Effects of early life social stress on endocrinology, maternal behavior, and lactation in rats. Horm Behav 2013; 64:634-41. [PMID: 24005186 PMCID: PMC3850073 DOI: 10.1016/j.yhbeh.2013.08.011] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 08/22/2013] [Accepted: 08/23/2013] [Indexed: 01/24/2023]
Abstract
Exposure to early life stress is a predictor of mental health disorders, and two common forms of early life stress are social conflict and impaired maternal care, which are predominant features of postpartum mood disorders. Exposure of lactating female rats to a novel male intruder involves robust social conflict and induces deficits in maternal care towards the F1 offspring. This exposure is an early life social stressor for female F1 pups that induces inefficient lactation associated with central changes in oxytocin (OXT), prolactin (PRL), and arginine vasopressin (AVP) gene expression in adult F1 females. The mothers of the rats in the current study were either allowed to raise their pups without exposure to a social stressor (control), or presented with a novel male intruder for 1h each day on lactation days 2-16 (chronic social stress). The effects of this early life chronic social stress (CSS) exposure on subsequent peripheral endocrinology, maternal behavior, and physiology were assessed. Exposure of female pups to early life CSS resulted in persistent alterations in maternal endocrinology at the end of lactation (attenuated prolactin and elevated corticosterone), depressed maternal care and aggression, increased restlessness and anxiety-related behavior, impaired lactation, and decreased saccharin preference. The endocrine and behavioral data indicate that early life CSS has long-term effects which are similar to changes seen in clinical populations of depressed mothers and provide support for the use of the chronic social stress paradigm as an ethologically relevant rodent model for maternal disorders such as postpartum depression and anxiety.
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Affiliation(s)
- Lindsay M Carini
- Department of Biomedical Sciences, Tufts University Cummings School of Veterinary Medicine, North Grafton, MA 01536, USA
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27
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Hyperprolactinemia impairs object recognition without altering spatial learning in male rats. Behav Brain Res 2013; 252:32-9. [DOI: 10.1016/j.bbr.2013.05.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 05/17/2013] [Accepted: 05/20/2013] [Indexed: 11/23/2022]
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Manjarrez-Gutiérrez G, González-Ramírez M, Boyzo-Montes de Oca A, Herrera-Márquez R, Hernández-Rodríguez J. Serotonin and dopamine in the hypothalamus of control and malnourished mother rats during pregnancy and lactation and body composition of their offspring. Nutr Neurosci 2013; 16:225-32. [PMID: 23928221 DOI: 10.1179/1476830512y.0000000049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
OBJECTIVE To determine concentrations of serotonin and dopamine in the hypothalamus of undernourished rats and controls during pregnancy and lactation and body composition of their offspring. METHODS Malnourished rats along with control rats were used during pregnancy and lactation. At birth of their offspring, control mothers nursed their young and malnourished rats and the undernourished mothers nursed their offspring and control pups. On days 5, 10, 15, and 21 of lactation (at the beginning and end of a feeding), L-tryptophan (L-Trp)-free, bound and total, plasma prolactin (PRL) and milk composition were determined. Serotonin and dopamine were measured in the hypothalamus. Body composition of offspring was determined. RESULTS Increase of free L-Trp was confirmed in undernourished mothers. Furthermore, hypothalamic serotonin was elevated at the start of suckling and decreased at termination. There was also a decrease in dopamine in the hypothalamus at the beginning and end of suckling followed by an increase of plasma PRL that was greater in control mothers who breastfed malnourished offspring. Interestingly, undernourished offspring consumed more milk and showed a clear recovery of body composition with accumulation of body fat. DISCUSSION Changes observed in hypothalamic neurotransmitters appear to be closely related to nutritional status and to the response and control of PRL production, possibly to adapt the offspring to the metabolic changes. It was also confirmed that on-demand feeding of undernourished offspring is the main factor involved in nutritional recovery and a predisposition to overweight in the recovered undernourished animals.
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Affiliation(s)
- Gabriel Manjarrez-Gutiérrez
- Laboratorio de Patología Molecular, Unidad de Investigación Biomolecular, Hospital de Cardiología, Centro Médico Nacional, Siglo XXI, Instituto Mexicano del Seguro Social, México, DF, México.
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Pinaffi F, Khan F, Silva L, Beg M, Ginther O. Ovarian and PGF2α responses to stimulation of endogenous PRL pulses during the estrous cycle in mares. Theriogenology 2012; 78:1252-61. [DOI: 10.1016/j.theriogenology.2012.05.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2012] [Revised: 05/21/2012] [Accepted: 05/21/2012] [Indexed: 10/28/2022]
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Sapsford TJ, Kokay IC, Ostberg L, Bridges RS, Grattan DR. Differential sensitivity of specific neuronal populations of the rat hypothalamus to prolactin action. J Comp Neurol 2012; 520:1062-77. [PMID: 21953590 DOI: 10.1002/cne.22775] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Prolactin stimulates dopamine release from neuroendocrine dopaminergic (NEDA) neurons in the hypothalamic arcuate nucleus (ARC) to maintain low levels of serum prolactin. Elevated prolactin levels during pregnancy and lactation may mediate actions in other hypothalamic regions such as the paraventricular nucleus (PVN) and rostral preoptic area (rPOA). We predicted that NEDA neurons would be more sensitive prolactin targets than neurons in other regions because they are required to regulate basal prolactin secretion. Moreover, differences in the accessibility of the ARC to prolactin in blood may influence the responsiveness of this population. Therefore, we compared prolactin-induced signaling in different hypothalamic neuronal populations following either systemic or intracerebroventricular (icv) prolactin administration. Phosphorylation of the signal transduction factor, STAT5 (pSTAT5), was used to identify prolactin-responsive neurons. In response to systemic prolactin, pSTAT5-labeled cells were widely observed in the ARC but absent from the rPOA and PVN. Many of these responsive cells in the ARC were identified as NEDA neurons. The lowest icv prolactin dose (10 ng) induced pSTAT5 in the ARC, but with higher doses (>500 ng) pSTAT5 was detected in numerous regions, including the rPOA and PVN. NEDA neurons were maximally labeled with nuclear pSTAT5 in response to 500 ng prolactin and appeared to be more sensitive than dopaminergic neurons in the rPOA. Subpopulations of oxytocin neurons in the hypothalamus were also found to be differentially sensitive to prolactin. These data suggest that differences in the accessibility of the arcuate nucleus to prolactin, together with intrinsic differences in the NEDA neurons, may facilitate homeostatic feedback regulation of prolactin release.
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Affiliation(s)
- Tony J Sapsford
- Centre for Neuroendocrinology and Department of Anatomy, University of Otago, Dunedin, New Zealand
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Prolactin regulates tuberoinfundibular dopamine neuron discharge pattern: novel feedback control mechanisms in the lactotrophic axis. J Neurosci 2012; 32:8074-83. [PMID: 22674282 DOI: 10.1523/jneurosci.0129-12.2012] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Balance in the body's hormonal axes depends on feedback onto neuroendocrine hypothalamic neurons. This phenomenon involves transcriptional and biosynthetic effects, yet less is known about the potential rapid modulation of electrical properties. Here, we investigated this issue in the lactotrophic axis, in which the pituitary hormone prolactin is tonically inhibited by tuberoinfundibular dopamine (TIDA) neurons located in the hypothalamic arcuate nucleus. Whole-cell recordings were performed on slices of the rat hypothalamus. In the presence of prolactin, spontaneously oscillating TIDA cells depolarized, switched from phasic to tonic discharge, and exhibited broadened action potentials. The underlying prolactin-induced current is composed of separate low- and high-voltage components that include the activation of a transient receptor potential-like current and the inhibition of a Ca(2+)-dependent BK-type K(+) current, respectively, as revealed by ion substitution experiments and pharmacological manipulation. The two components of the prolactin-induced current appear to be mediated through distinct signaling pathways as the high-voltage component is abolished by the phosphoinositide 3-kinase blocker wortmannin, whereas the low-voltage component is not. This first description of the central electrophysiological actions of prolactin suggests a novel feedback mechanism. By simultaneously enhancing the discharge and spike duration of TIDA cells, increased serum prolactin can promote dopamine release to limit its own secretion with implications for the control of lactation, sexual libido, fertility, and body weight.
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Le Tissier PR, Hodson DJ, Lafont C, Fontanaud P, Schaeffer M, Mollard P. Anterior pituitary cell networks. Front Neuroendocrinol 2012; 33:252-66. [PMID: 22981652 DOI: 10.1016/j.yfrne.2012.08.002] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Revised: 08/17/2012] [Accepted: 08/18/2012] [Indexed: 12/17/2022]
Abstract
Both endocrine and non-endocrine cells of the pituitary gland are organized into structural and functional networks which are formed during embryonic development but which may be modified throughout life. Structural mapping of the various endocrine cell types has highlighted the existence of distinct network motifs and relationships with the vasculature which may relate to temporal differences in their output. Functional characterization of the network activity of growth hormone and prolactin cells has revealed a role for cell organization in gene regulation, the plasticity of pituitary hormone output and remarkably the ability to memorize altered demand. As such, the description of these endocrine cell networks alters the concept of the pituitary from a gland which simply responds to external regulation to that of an oscillator which may memorize information and constantly adapt its coordinated networks' responses to the flow of hypothalamic inputs.
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Affiliation(s)
- P R Le Tissier
- Division of Molecular Neuroendocrinology, MRC National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom;
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Pinaffi F, Pugliesi G, Hannan M, Silva L, Beg M, Ginther O. Direct effect of PGF2α pulses on PRL pulses, based on inhibition of PRL or PGF2α secretion in heifers. Theriogenology 2012; 78:678-87. [DOI: 10.1016/j.theriogenology.2012.03.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 02/23/2012] [Accepted: 03/03/2012] [Indexed: 02/04/2023]
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No evidence for a trade-off between reproductive investment and immunity in a rodent. PLoS One 2012; 7:e37182. [PMID: 22649512 PMCID: PMC3359356 DOI: 10.1371/journal.pone.0037182] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 04/17/2012] [Indexed: 11/19/2022] Open
Abstract
Life history theory assumes there are trade-offs between competing functions such as reproduction and immunity. Although well studied in birds, studies of the trade-offs between reproduction and immunity in small mammals are scarce. Here we examined whether reduced immunity is a consequence of reproductive effort in lactating Brandt's voles (Lasiopodomys brandtii). Specifically, we tested the effects of lactation on immune function (Experiment I). The results showed that food intake and resting metabolic rate (RMR) were higher in lactating voles (6≤ litter size ≤8) than that in non-reproductive voles. Contrary to our expectation, lactating voles also had higher levels of serum total Immunoglobulin G (IgG) and anti-keyhole limpet hemocyanin (KLH) IgG and no change in phytohemagglutinin (PHA) response and anti-KLH Immunoglobulin M (IgM) compared with non-reproductive voles, suggesting improved rather than reduced immune function. To further test the effect of differences in reproductive investment on immunity, we compared the responses between natural large (n≥8) and small litter size (n≤6) (Experiment II) and manipulated large (11-13) and small litter size (2-3) (Experiment III). During peak lactation, acquired immunity (PHA response, anti-KLH IgG and anti-KLH IgM) was not significantly different between voles raising large or small litters in both experiments, despite the measured difference in reproductive investment (greater litter size, litter mass, RMR and food intake in the voles raising larger litters). Total IgG was higher in voles with natural large litter size than those with natural small litter size, but decreased in the enlarged litter size group compared with control and reduced group. Our results showed that immune function is not suppressed to compensate the high energy demands during lactation in Brandt's voles and contrasting the situation in birds, is unlikely to be an important aspect mediating the trade-off between reproduction and survival.
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Woller MJ, Sosa ME, Chiang Y, Prudom SL, Keelty P, Moore JE, Ziegler TE. Differential hypothalamic secretion of neurocrines in male common marmosets: parental experience effects? J Neuroendocrinol 2012; 24:413-21. [PMID: 22070606 PMCID: PMC3288632 DOI: 10.1111/j.1365-2826.2011.02252.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Pregnancy and lactation produce a plethora of hormonal changes in females that promote maternal care of offspring. Males in the biparental marmoset species (Callithrix jacchus) demonstrate high levels of parenting behaviour and express enhanced circulating reproductive hormones. Furthermore, these hormonal changes are influenced by paternal experience. To determine whether the paternally experienced male marmoset has altered neurocrine hypothalamic release, as the maternal females does, we examined the release of several reproductive neurocrines, dopamine (DA), oxytocin (OT), vasopressin (AVP) and prolactin (PRL), in cultured explants of the hypothalamus of paternally experienced male marmosets compared to naïve, paternally inexperienced males. DA levels secreted from the isolated hypothalamus were significantly lower in the experienced males, whereas OT and PRL levels were significantly higher than levels found in inexperienced males. PRL levels decreased rapidly in the hypothalamic media, suggesting that PRL production occurs elsewhere. AVP levels did not change. Stimulation of the cultured explants with oestradiol significantly decreased DA levels in the inexperienced males but did not alter the other neurocrines, suggesting a direct effect of oestradiol on DA suppression in the hypothalamus. Although other factors such as age and rearing experience with siblings may play a role in hypothalamic neurocrine levels, these results demonstrate that paternal experience may impact upon the secretion of neurocrines in a male biparental primate.
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Affiliation(s)
- Michael J. Woller
- Department of Biology, University of Wisconsin-Whitewater, Madison WI, 53715, USA
| | - Megan E. Sosa
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison WI, 53715, USA
| | - Yun Chiang
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison WI, 53715, USA
| | - Shelley L. Prudom
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison WI, 53715, USA
| | | | - Jason E. Moore
- Department of Biology, University of Wisconsin-Whitewater, Madison WI, 53715, USA
| | - Toni E. Ziegler
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison WI, 53715, USA
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Górski K, Romanowicz K, Herman A, Molik E, Gajewska A, Tomaszewska-Zaremba D, Misztal T. The possible involvement of salsolinol and hypothalamic prolactin in the central regulatory processes in ewes during lactation. Reprod Domest Anim 2011; 45:e54-60. [PMID: 19747187 DOI: 10.1111/j.1439-0531.2009.01521.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Salsolinol, a dopamine-related compound and prolactin-producing cells were found in the ovine hypothalamus. This study was designed to test the hypothesis that salsolinol, acting from the CNS level, is able to stimulate pituitary prolactin release as well as prolactin mRNA expression in the anterior pituitary cells (AP) and in the mediobasal hypothalamus (MBH) in lactating ewes. The intracerebroventricular infusions of salsolinol in two doses, total of 50 ng or 5 μg, were performed in a series of five 10-min infusions at 20-min intervals. All infusions were made from 12:30 to 15:00 and the pre-infusion period was from 10:00 to 12.30 h. The prolactin concentration in plasma samples, collected every 10 min, was determined by radioimmunoassay; prolactin mRNA expression in AP and MBH tissues was determined by real-time PCR. The obtained results showed that salsolinol infused at the higher dose significantly (p < 0.001) increased plasma prolactin concentration in lactating ewes, when compared with the concentration noted before the infusion and with that in lactating controls. In lactating ewes, the relative levels of prolactin mRNA expression in the AP and MBH were up to twofold and fivefold higher respectively than in non-lactating ewes (p < 0.05). In our experimental design, salsolinol did not significantly affect the ongoing process of prolactin gene expression in these tissues. We conclude that in ewes, salsolinol may be involved, at least, in the process of stimulation of prolactin release during lactation and that hypothalamic prolactin plays an important role in the central mechanisms of adaptation to lactation.
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Affiliation(s)
- K Górski
- Department of Endocrinology, The Kielanowski Institute of Animal Physiology and Nutrition Polish Academy of Sciences, Jablonna n/Warsaw, Poland
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Saltzman W, Maestripieri D. The neuroendocrinology of primate maternal behavior. Prog Neuropsychopharmacol Biol Psychiatry 2011; 35:1192-204. [PMID: 20888383 PMCID: PMC3072435 DOI: 10.1016/j.pnpbp.2010.09.017] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Revised: 09/23/2010] [Accepted: 09/24/2010] [Indexed: 10/19/2022]
Abstract
In nonhuman primates and humans, similar to other mammals, hormones are not strictly necessary for the expression of maternal behavior, but nevertheless influence variation in maternal responsiveness and parental behavior both within and between individuals. A growing number of correlational and experimental studies have indicated that high circulating estrogen concentrations during pregnancy increase maternal motivation and responsiveness to infant stimuli, while effects of prepartum or postpartum estrogens and progestogens on maternal behavior are less clear. Prolactin is thought to play a role in promoting paternal and alloparental care in primates, but little is known about the relationship between this hormone and maternal behavior. High circulating cortisol levels appear to enhance arousal and responsiveness to infant stimuli in young, relatively inexperienced female primates, but interfere with the expression of maternal behavior in older and more experienced mothers. Among neuropeptides and neurotransmitters, preliminary evidence indicates that oxytocin and endogenous opioids affect maternal attachment to infants, including maintenance of contact, grooming, and responses to separation. Brain serotonin affects anxiety and impulsivity, which in turn may affect maternal behaviors such as infant retrieval or rejection of infants' attempts to make contact with the mother. Although our understanding of the neuroendocrine correlates of primate maternal behavior has grown substantially in the last two decades, very little is known about the mechanisms underlying these effects, e.g., the extent to which these mechanisms may involve changes in perception, emotion, or cognition.
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Affiliation(s)
- Wendy Saltzman
- Department of Biology, University of California, Riverside, CA 92521, USA.
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38
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Gao P, Ishige A, Murakami Y, Nakata H, Oka JI, Munakata K, Yamamoto M, Nishimura K, Watanabe K. Maternal stress affects postnatal growth and the pituitary expression of prolactin in mouse offspring. J Neurosci Res 2011; 89:329-40. [PMID: 21259320 DOI: 10.1002/jnr.22550] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Revised: 10/14/2010] [Accepted: 10/14/2010] [Indexed: 01/12/2023]
Abstract
Maternal stress exerts long-lasting psychiatric and somatic on offspring, which persist into adulthood. However, the effect of maternal stress on the postnatal growth of pups has not been widely reported. In this study, we found that maternal immobilization stress (IS) during lactation resulted in low body weight of male mouse offspring, which persisted after weaning. Despite free access to chow, IS induced maternal malnutrition and decreased the serum insulin-like growth factor-1 (IGF-1) levels in the mothers and in the pups. mRNA expression analysis of anterior pituitary hormones in the pups revealed that growth hormone (GH) and prolactin (PRL), but no other hormones, were decreased by IS. Expression of the pituitary transcription factor PIT1 and isoforms of PITX2, which are essential for the development and function of GH-producing somatotropes and PRL-producing lactotropes, was decreased, whereas that of PROP1, which is critical for the earlier stages of pituitary development, was unchanged. Immunohistochemistry also showed a decrease in pituitary PRL protein expression. These results suggest that stress in a postpartum mother has persistent effects on the body weight of the offspring. Reduced PRL expression in the offspring's pituitary gland may play a role in these effects.
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Affiliation(s)
- Pengfei Gao
- Center for Kampo Medicine, Keio University School of Medicine, Tokyo, Japan
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Arbogast LA. Tuberoinfundibular peptide of 39 residues (TIP39): a new player in the translation of sensory input to prolactin release during lactation. Endocrinology 2010; 151:5568-9. [PMID: 21098127 DOI: 10.1210/en.2010-1107] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Lydia A Arbogast
- Department of Physiology, Southern Illinois University School of Medicine, Carbondale, Illinois 62901-6523, USA.
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40
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The effects of melatonin on prolactin and growth hormone secretion in ewes under different photoperiods, during the early post partum period. Small Rumin Res 2010. [DOI: 10.1016/j.smallrumres.2010.07.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Siracusa C, Manteca X, Cuenca R, del Mar Alcalá M, Alba A, Lavín S, Pastor J. Effect of a synthetic appeasing pheromone on behavioral, neuroendocrine, immune, and acute-phase perioperative stress responses in dogs. J Am Vet Med Assoc 2010; 237:673-81. [PMID: 20839989 DOI: 10.2460/javma.237.6.673] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To study the effects of a synthetic, dog-appeasing pheromone (sDAP) on the behavioral, neuroendocrine, immune, and acute-phase perioperative stress responses in dogs undergoing elective orchiectomy or ovariohysterectomy. DESIGN Randomized, controlled clinical trial. ANIMALS 46 dogs housed in animal shelters and undergoing elective orchiectomy or ovariohysterectomy. PROCEDURES Intensive care unit cages were sprayed with sDAP solution or sham treated with the carrier used in the solution 20 minutes prior to use. Dogs (n = 24 and 22 in the sDAP and sham treatment exposure groups, respectively) were placed in treated cages for 30 minutes before and after surgery. Indicators of stress (ie, alterations in behavioral, neuroendocrine, immune, and acute-phase responses) were evaluated perioperatively. Behavioral response variables, salivary cortisol concentration, WBC count, and serum concentrations of glucose, prolactin, haptoglobin, and C-reactive protein were analyzed. RESULTS Behavioral response variables and serum prolactin concentration were influenced by sDAP exposure. Dogs exposed to sDAP were more likely to have alertness and visual exploration behaviors after surgery than were dogs exposed to sham treatment. Decreases in serum prolactin concentrations in response to perioperative stress were significantly smaller in dogs exposed to sDAP, compared with findings in dogs exposed to the sham treatment. Variables examined to evaluate the hypothalamic-pituitary-adrenal axis, immune system, and acute-phase responses were unaffected by treatment. CONCLUSIONS AND CLINICAL RELEVANCE sDAP appeared to affect behavioral and neuroendocrine perioperative stress responses by modification of lactotropic axis activity. Use of sDAP in a clinical setting may improve the recovery and welfare of dogs undergoing surgery.
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Affiliation(s)
- Carlo Siracusa
- Department of Animal Medicine and Surgery, School of Veterinary Medicine, Autonomous University of Barcelona, Bellaterra, Spain.
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Patel OV, Casey T, Dover H, Plaut K. Homeorhetic adaptation to lactation: comparative transcriptome analysis of mammary, liver, and adipose tissue during the transition from pregnancy to lactation in rats. Funct Integr Genomics 2010; 11:193-202. [PMID: 20852911 DOI: 10.1007/s10142-010-0193-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 07/27/2010] [Accepted: 09/06/2010] [Indexed: 12/11/2022]
Abstract
Tissue-specific shifts in a dam's metabolism to support fetal and neonatal growth during pregnancy and lactation are controlled by differential expression of regulatory genes. The goal of this study was to identify a more detailed cohort of genes in mammary, liver, and adipose tissue that are transcriptionally controlled during the pregnancy to lactation evolution and explore the relationship of these genes to core clock genes. Total RNA was isolated from mammary, liver and adipose tissues collected from rat dams on day 20 of pregnancy (P20) and day 1 of lactation (L1) and gene expression was measured using Rat 230 2.0 Affymetrix GeneChips. Gene functional analysis revealed that pathway associated metabolism (carbohydrate, amino acid, lipid, cholesterol, protein) were enriched (P < 0.001) in the mammary gland during P20 to L1 transition. Approximately 50% of the genes associated with solute transport, as well as lipogenesis were up-regulated in the mammary gland during P20 to L1 transition compared to 10% in liver and 15% in adipose tissue. Genes engaged in conveying glucose (INSR, GLUT1, GLUT4, SGLT1, and SGLT2), bicarbonate (SLC4), sodium (SLC9), zinc (SLC30), copper (SLC31), iron (SLC40) in tandem with rate-limiting lipogenic genes (ACACA, FASN, PRLR, SREBP2, THRSP) were specifically enriched in the mammary gland during the P20 to L1 evolution. Our results provide insight into a cross-tissue transcriptional repertoire that is associated with homeorhetic adaptation needed to support lactation, and at the onset of lactation the mammary gland becomes a factory for macromolecular biosynthesis through inducing genes participating in nutrient transfer and lipid biosynthesis.
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Affiliation(s)
- Osman V Patel
- Department of Cell and Molecular Biology, Grand Valley State University, Allendale, MI 49401, USA
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Larsen CM, Grattan DR. Prolactin-induced mitogenesis in the subventricular zone of the maternal brain during early pregnancy is essential for normal postpartum behavioral responses in the mother. Endocrinology 2010; 151:3805-14. [PMID: 20484459 DOI: 10.1210/en.2009-1385] [Citation(s) in RCA: 134] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
High prolactin during pregnancy, which is essential for normal postpartum maternal behavior, increases neurogenesis in the subventricular zone of the lateral ventricle (SVZ) of the maternal brain. Because SVZ mitogenesis generates new olfactory neurons and may contribute to perception of novel odorants, we hypothesized that the prolactin-induced increase in SVZ mitogenesis during pregnancy might be important for normal maternal interactions with pups. To investigate this hypothesis, prolactin secretion was suppressed for 3 d early in pregnancy in mice, using a carefully timed dose of bromocriptine. The bromocriptine-induced reduction in prolactin prevented the normal increase in generation of neural progenitors in the SVZ of the maternal brain. Another group of bromocriptine-treated animals were allowed to continue their pregnancy until term, and then maternal behaviors were evaluated postpartum. Low prolactin during early pregnancy, and the consequent suppression of mitogenesis in the SVZ of the maternal brain, was subsequently followed by increased postpartum anxiety and markedly impaired maternal behavior. In another group of pregnant females, injections of the mitotic inhibitor methylazoxymethanol to specifically suppress neurogenesis in the mother during early pregnancy without affecting prolactin secretion also caused postpartum anxiety and impaired maternal behavior. These data demonstrate that prolactin-induced increase in generation of neural progenitors in the SVZ of the maternal brain during early pregnancy is required for normal expression of postpartum maternal behaviors.
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Affiliation(s)
- Caroline M Larsen
- Centre for Neuroendocrinology and Department of Anatomy and Structural Biology, University of Otago, New Zealand
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Tavakoli-Nezhad M, Arbogast LA. Mu and kappa opioid receptor expression in the mediobasal hypothalamus and effectiveness of selective antagonists on prolactin release during lactation. Neuroscience 2010; 166:359-67. [PMID: 20045447 PMCID: PMC2824054 DOI: 10.1016/j.neuroscience.2009.12.066] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2009] [Revised: 12/27/2009] [Accepted: 12/28/2009] [Indexed: 12/31/2022]
Abstract
Endogenous opioid peptides are involved in prolactin release during lactation, in part by decreasing tuberoinfundibular dopaminergic (TIDA) neuronal activity. Both mu (mu) and kappa (kappa) opioid receptors have a role in the suckling-induced prolactin rise after 4-5 h up deprivation. The aim of this study was to investigate effects of mu opioid receptor antagonist, beta-funaltrexamine (beta-FNA), and kappa opioid receptor antagonist, nor-binaltorphimine (nor-BNI), on prolactin secretion and TIDA neuronal activity in lactating rats after 18 h pup deprivation. After 4 h separation from pups, the suckling-induced prolactin rise was abolished by 16 microg nor-BNI and 5 microg beta-FNA, coincident with increased dihydroxyphenylacetic acid (DOPAC):dopamine ratio in the stalk-median eminence (SME). However, after 18 h pups separation, these same doses of nor-BNI and beta-FNA did not alter the prolactin surge or DOPAC:dopamine ratios in the SME. Higher doses of nor-BNI (32 microg) and beta-FNA (10 microg) were required to inhibit suckling-induced prolactin secretion. beta-FNA (10 microg) increased the DOPAC:dopamine ratio in the SME, whereas nor-BNI (32 microg) treatment had no effect. The mu and kappa opioid receptor mRNA levels in the mediobasal hypothalamus were similar to suckled control rats after 4 h pup deprivation, but increased 1.4-fold after 18 h pup deprivation. These data support involvement of endogenous opioidergic systems in the suckling-induced prolactin rise after a prolonged (18 h) period of pup deprivation, as well as the shorter (4 h) pup deprivation period previously reported. Suppression of TIDA neuronal activity likely played a part in mu opioid receptor input to the suckling-induced prolactin rise after both 4 h and 18 h separation, whereas non-dopaminergic input was implicated with kappa opioid receptors after 18 h pup deprivation. Increased mu and kappa opioid receptors gene expression in the mediobasal hypothalamus may contribute to reduced effectiveness of opioid receptor antagonists to block suckling-induced prolactin release after 18 h pup deprivation.
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Affiliation(s)
- M Tavakoli-Nezhad
- Department of Physiology, Mail Code 6523, School of Medicine, Southern Illinois University, Carbondale, IL 62901, USA
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Effects of a structural analogue of salsolinol, 1-MeDIQ, on pituitary prolactin release and dopaminergic activity in the mediobasal hypothalamus in nursing sheep. Brain Res 2010; 1307:72-7. [DOI: 10.1016/j.brainres.2009.10.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 10/12/2009] [Accepted: 10/14/2009] [Indexed: 12/24/2022]
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47
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Zhang P, Liu L, Xie CJ, Wang KH, Gao LZ, Ju G. Excitatory and inhibitory effects of prolactin release activated by nerve stimulation in rat anterior pituitary. Reprod Biol Endocrinol 2009; 7:154. [PMID: 20042121 PMCID: PMC2804610 DOI: 10.1186/1477-7827-7-154] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Accepted: 12/31/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND A series of studies showed the presence of substantial amount of nerve fibers and their close relationship with the anterior pituitary gland cells. Our previous studies have suggested that aside from the classical theory of humoral regulation, the rat anterior pituitary has direct neural regulation on adrenocorticotropic hormone release. In rat anterior pituitary, typical synapses are found on every type of the hormone-secreting cells, many on lactotrophs. The present study was aimed at investigating the physiological significance of this synaptic relationship on prolactin release. METHODS The anterior pituitary of rat was sliced and stimulated with electrical field in a self-designed perfusion chamber. The perfusate was continuously collected in aliquots and measured by radioimmunoassay for prolactin levels. After statistic analysis, differences of prolactin concentrations within and between groups were outlined. RESULTS The results showed that stimulation at frequency of 2 Hz caused a quick enhancement of prolactin release, when stimulated at 10 Hz, prolactin release was found to be inhibited which came slower and lasted longer. The effect of nerve stimulation on prolactin release is diphasic and frequency dependent. CONCLUSIONS The present in vitro study offers the first physiological evidence that stimulation of nerve fibers can affect prolactin release in rat anterior pituitary. Low frequency stimulation enhances prolactin release and high frequency mainly inhibits it.
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Affiliation(s)
- Ping Zhang
- Institute of Neurosciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Ling Liu
- Institute of Neurosciences, the Fourth Military Medical University, Xi'an, China
| | - Cong-Jun Xie
- Institute of Neurosciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Kai-Hu Wang
- School of Foreign Languages, Shanghai Jiao Tong University, Shanghai, China
| | - Li-Zhi Gao
- Institute of Neurosciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Gong Ju
- Institute of Neurosciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
- Institute of Neurosciences, the Fourth Military Medical University, Xi'an, China
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Capasso R, Aviello G, Capasso F, Savino F, Izzo AA, Lembo F, Borrelli F. Silymarin BIO-C, an extract from Silybum marianum fruits, induces hyperprolactinemia in intact female rats. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2009; 16:839-44. [PMID: 19303749 DOI: 10.1016/j.phymed.2009.02.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2009] [Accepted: 02/10/2009] [Indexed: 05/27/2023]
Abstract
Breastfeeding is widely acknowledged to have important health benefits for infants and mothers. Milk thistle (Silybum marianum fruits) has been recently proposed to be used by nursing mothers for stimulating milk production; however, the mode of action of this herbal drug is still unknown. In this paper, we have evaluated the effect of a micronized standardized extract of S. marianum (Silymarin BIO-C=Piùlatte) on the serum levels of prolactin in female rats. A 14-day treatment with Silymarin BIO-C (25-200mg/kg, given orally) increased, in a dose dependent manner, the serum prolactin levels. Moreover, after a 66-day discontinuation of Silymarin BIO-C treatment, prolactin levels were still significantly elevated although we observed a trend to decrease that was counteracted by a further 7-day treatment with Silymarin BIO-C. Bromocriptine, a dopamine D(2) receptor agonist, (1-10mg/kg, os) significantly and in a dose dependent manner, reduced the serum prolactin levels; bromocriptine, at the dose of 1mg/kg, significantly reduced the high serum prolactin levels induced by Silymarin BIO-C. In conclusion, we have shown that an extract from S. marianum fruits significantly increases circulating prolactin levels in female rats; this effect seems to involve, at least in part, dopamine D(2) receptors.
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Affiliation(s)
- Raffaele Capasso
- Department of Experimental Pharmacology, University of Naples Federico II, Naples, Italy
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Circulating prolactin, MPOA prolactin receptor expression and maternal aggression in lactating rats. Behav Brain Res 2008; 197:97-102. [PMID: 18765257 DOI: 10.1016/j.bbr.2008.08.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2007] [Revised: 08/04/2008] [Accepted: 08/06/2008] [Indexed: 11/24/2022]
Abstract
Maternal aggression is most intense in lactating rats from the 3rd to the 12th day postpartum. The purpose of this study was to determine if plasma prolactin (PRL) and prolactin receptor (PRL-R(L)) mRNA expression in the medial preoptic area (MPOA) of lactating rats are altered in association with maternal aggression. Lactating Sprague Dawley rats were divided into five groups and exposed for 10 min to an intruder male or to an object on postpartum day 8. Trunk blood and the brain of the dams were collected 30 or 240 min after exposure and from a non-exposed group. Lower levels of prolactin were found 30 min after the aggression test. No change was detected in the number of cells expressing PRL-R(L) mRNA by in situ hybridization histochemistry (ISHH) as a function of testing. However, the correlation between plasma PRL and PRL-R(L) mRNA expression in the mothers changed from positive in control females to negative in intruder exposed animals. These data support the concept that a maternal aggressive experience, while acutely altering PRL secretion, fails to affect PRL-R(L) mRNA expression.
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Abstract
The neuroendocrine control of prolactin secretion is unlike that of any other pituitary hormone. It is predominantly inhibited by the hypothalamus and, in the absence of a regulatory feedback hormone, it acts directly in the brain to suppress its own secretion. In addition to this short-loop feedback action in the brain, prolactin has been reported to influence a wide range of other brain functions. There have been few attempts to rationalise why a single hormone might exert such a range of distinct and seemingly unrelated neuroendocrine functions. In this review, we highlight some of the original studies that first characterised the unusual features of prolactin neuroendocrinology, and then attempt to identify areas of new progress and/or controversy. Finally, we discuss a hypothesis that provides a unifying explanation for the pleiotrophic actions of prolactin in the brain.
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Affiliation(s)
- D R Grattan
- Centre for Neuroendocrinology and Department of Anatomy and Structural Biology, University of Otago, Dunedin, New Zealand.
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