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Tóth A, Keserű D, Pethő M, Détári L, Bencsik N, Dobolyi Á, Hajnik T. Sleep and local field potential effect of the D2 receptor agonist bromocriptine during the estrus cycle and postpartum period in female rats. Pharmacol Biochem Behav 2024; 239:173754. [PMID: 38537873 DOI: 10.1016/j.pbb.2024.173754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 03/12/2024] [Accepted: 03/22/2024] [Indexed: 04/08/2024]
Abstract
BACKGROUND Pituitary lactotrophs are under tonic dopaminergic inhibitory control and bromocriptine treatment blocks prolactin secretion. METHODS Sleep and local field potential were addressed for 72 h after bromocriptine treatments applied during the different stages of the estrus cycle and for 24 h in the early- and middle postpartum period characterized by spontaneously different dynamics of prolactin release in female rats. RESULTS Sleep changes showed strong dependency on the estrus cycle phase of the drug application. Strongest increase of wakefulness and reduction of slow wave sleep- and rapid eye movements sleep appeared during diestrus-proestrus and middle postpartum treatments. Stronger sleep-wake effects appeared in the dark phase in case of the estrus cycle treatments, but in the light phase in postpartum treatments. Slow wave sleep and REM sleep loss in case of estrus cycle treatments was not compensated at all and sleep loss seen in the first day post-injection was gained further later. In opposition, slow wave sleep loss in the light phase after bromocriptine injections showed compensation in the postpartum period treatments. Bromocriptine treatments resulted in a depression of local field potential delta power during slow wave sleep while an enhancement in beta and gamma power during wakefulness regardless of the treatment timing. CONCLUSIONS These results can be explained by the interplay of dopamine D2 receptor agonism, lack of prolactin release and the spontaneous homeostatic sleep drive being altered in the different stages of the estrus cycle and the postpartum period.
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Affiliation(s)
- Attila Tóth
- In vivo Electrophysiology Research Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Hungary.
| | - Dóra Keserű
- In vivo Electrophysiology Research Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Hungary
| | - Máté Pethő
- In vivo Electrophysiology Research Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Hungary
| | - László Détári
- In vivo Electrophysiology Research Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Hungary
| | - Norbert Bencsik
- Cellular Neurobiology Research Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Hungary
| | - Árpád Dobolyi
- Laboratory of Molecular and Systems Neurobiology, Department of Physiology and Neurobiology, Eötvös Loránd University, Hungary
| | - Tünde Hajnik
- In vivo Electrophysiology Research Group, Department of Physiology and Neurobiology, Eötvös Loránd University, Hungary
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Szukiewicz D. Current Insights in Prolactin Signaling and Ovulatory Function. Int J Mol Sci 2024; 25:1976. [PMID: 38396659 PMCID: PMC10889014 DOI: 10.3390/ijms25041976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 01/31/2024] [Accepted: 02/03/2024] [Indexed: 02/25/2024] Open
Abstract
Prolactin (PRL) is a pleiotropic hormone released from lactotrophic cells of the anterior pituitary gland that also originates from extrapituitary sources and plays an important role in regulating lactation in mammals, as well as other actions. Acting in an endocrine and paracrine/autocrine manner, PRL regulates the hypothalamic-pituitary-ovarian axis, thus influencing the maturation of ovarian follicles and ovulation. This review provides a detailed discussion of the current knowledge on the role of PRL in the context of ovulation and ovulatory disorders, particularly with regard to hyperprolactinemia, which is one of the most common causes of infertility in women. Much attention has been given to the PRL structure and the PRL receptor (PRLR), as well as the diverse functions of PRLR signaling under normal and pathological conditions. The hormonal regulation of the menstrual cycle in connection with folliculogenesis and ovulation, as well as the current classifications of ovulation disorders, are also described. Finally, the state of knowledge regarding the importance of TIDA (tuberoinfundibular dopamine), KNDγ (kisspeptin/neurokinin B/dynorphin), and GnRH (gonadotropin-releasing hormone) neurons in PRL- and kisspeptin (KP)-dependent regulation of the hypothalamic-pituitary-gonadal (HPG) axis in women is reviewed. Based on this review, a rationale for influencing PRL signaling pathways in therapeutic activities accompanying ovulation disorders is presented.
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Affiliation(s)
- Dariusz Szukiewicz
- Department of Biophysics, Physiology & Pathophysiology, Faculty of Health Sciences, Medical University of Warsaw, 02-004 Warsaw, Poland
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Avsar O, Derinoz N, Yilmaz F, Yilmaz M, Gorkem U. Association between dopamine transporter gene ( DAT1/SLC6A3) variants and infertility in the Turkish females. Gynecol Endocrinol 2022; 38:573-576. [PMID: 35536100 DOI: 10.1080/09513590.2022.2073992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
OBJECTIVE Worldwide, approximately 10-15% of couples is affected by infertility and infertility is associated with disturbances in female and/or male reproductive systems. The aim of the current study is to investigate the relationship between DAT1 (SLC6A3) VNTR polymorphism with female infertility. METHODS Genomic DNA extractions were performed in 98 fertile and 90 infertile females, 3' untranslated region (3' UTR) variable number tandem repeat (VNTR) polymorphism of DAT1/SLC6A3 was determined by the use of Polymerase Chain Reaction (PCR) method. RESULTS It has been demonstrated that there was no statistically significant difference between female infertile and fertile groups in the terms of DAT1 genotypes (p > .05). Moreover, there was no significant difference regarding the frequencies of 9R and 10R alleles in infertile and fertile groups (p > .05). CONCLUSION This is the first study for investigating the relationship between DAT1/SLC6A3 gene polymorphism and infertility in females. Our study contributes to the growing awareness of the relationship between dopaminergic system and female infertility despite no significant differences were reported between infertile females and corresponding fertile subjects in DAT1/SLC6A3 gene.
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Affiliation(s)
- Orcun Avsar
- Department of Molecular Biology and Genetics, Faculty of Arts and Sciences, Hitit University, Corum, Turkey
| | - Nesibe Derinoz
- Department of Molecular Biology and Genetics, Faculty of Arts and Sciences, Hitit University, Corum, Turkey
| | - Filiz Yilmaz
- Department of Medical Histology and Embryology, Hitit University Erol Olcok Training and Research Hospital, Corum, Turkey
| | - Musa Yilmaz
- Department of Medical Biochemistry, Faculty of Medicine, Hitit University, Corum, Turkey
| | - Umit Gorkem
- Department of Obstetrics and Gynaecology, Faculty of Medicine, Hitit University, Corum, Turkey
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Markov AG, Shadrin LV, Kruglova NM, Fedorova AA, Razgovorova IA, Chernysheva MP. Is Thyrotropin-Releasing Hormone an Integrator of Prolactin- and Oxytocin-Dependent Processes in the Mammary Gland and Maternal Behavior of Lactating Mice? J EVOL BIOCHEM PHYS+ 2021. [DOI: 10.1134/s0022093021050203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Zhuo C, Xu Y, Wang H, Fang T, Chen J, Zhou C, Li Q, Liu J, Xu S, Yao C, Yang W, Yang A, Li B, Chen Y, Tian H, Lin C. Safety and Efficacy of High-Dose Vitamin B6 as an Adjunctive Treatment for Antipsychotic-Induced Hyperprolactinemia in Male Patients With Treatment-Resistant Schizophrenia. Front Psychiatry 2021; 12:681418. [PMID: 34512411 PMCID: PMC8426548 DOI: 10.3389/fpsyt.2021.681418] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Accepted: 08/05/2021] [Indexed: 12/28/2022] Open
Abstract
This study aimed to investigate the safety and efficacy of high-dose vitamin B6 (vB6) as an adjunct treatment for antipsychotic-induced hyperprolactinemia (AIHP) in male patients with treatment-resistant schizophrenia (TRS). In this randomized double-blinded controlled study, patients were randomized (1:1) into a control group given aripiprazole (ARI; 10 mg/day; n = 100) or an intervention group given vB6 (300 mg/12 h for 16 weeks; n = 100). Prolactin levels, psychotic symptoms [Positive and Negative Syndrome Scale (PANSS)], cognitive function [MATRICS Consensus Cognitive Battery (MCCB)], liver function, kidney function, growth hormone level, micronutrient levels, blood lipids, and adverse secondary effects (ASEs)[Treatment Emergent Symptom Scale (TESS) and Barnes-Akathisia scale] were monitored. After a 16-week treatment period, the vB6 group showed a 68.1% reduction in serum prolactin levels (from 95.52 ± 6.30 μg/L to 30.43 ± 18.65 μg/L) while the ARI group showed only a 37.4% reduction (from 89.07 ± 3.59 μg/L to 55.78 ± 7.39 μg/L). During weeks 1-4, both treatments reduced prolactin similarly. Subsequently, the ARI effect plateaued, while the vB6 effect remained robust. The vB6 group showed better alleviation of psychotic symptoms and cognitive impairment. No serious ASEs were observed; ASEs were more frequent in the ARI group. AIHP reduction efficacy of vB6 was associated with baseline prolactin and triglyceride levels, total vB6 dosage, and education level. In conclusion, compared with the ARI group, TRS patients given vB6 showed better attenuation of AIHP, lower ASE scores, and greater improvements in clinical symptoms and cognitive impairments. These results support further consideration of vB6 as a putative treatment for AIHP. Trial Registration: ChiCTR1800014755.
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Affiliation(s)
- Chuanjun Zhuo
- Key Laboratory of Multiple Organ Damages of Major Psychoses (MODMP_Lab), Tianjin Fourth Center Hospital, The Fourth Central Hospital Affiliated With Nankai University, The Fourth Central Hospital Affiliated to Tianjin Medical University, Tianjin, China.,Key Laboratory of Real Time Brain Circuit Tracing in Neurology and Psychiatry (RTBNP_Lab), Tianjin Fourth Center Hospital, The Fourth Central Hospital Affiliated With Nankai University, The Fourth Central Hospital Affiliated to Tianjin Medical University, Tianjin, China
| | - Yong Xu
- Department of Psychiatry, First Hospital/First Clinical Medical College of Shanxi Medical University, Taiyuan, China.,Mental Disorder Therapy Center for Cognitive Impairment and Sleep Disorders, First Hospital of Shanxi Medical University, Taiyuan, China
| | - Haibo Wang
- Peking University Clinical Research Institute, Peking University First Hospital, Beijing, China
| | - Tao Fang
- Key Laboratory of Multiple Organ Damages of Major Psychoses (MODMP_Lab), Tianjin Fourth Center Hospital, The Fourth Central Hospital Affiliated With Nankai University, The Fourth Central Hospital Affiliated to Tianjin Medical University, Tianjin, China.,Key Laboratory of Real Time Brain Circuit Tracing in Neurology and Psychiatry (RTBNP_Lab), Tianjin Fourth Center Hospital, The Fourth Central Hospital Affiliated With Nankai University, The Fourth Central Hospital Affiliated to Tianjin Medical University, Tianjin, China
| | - Jiayue Chen
- Key Laboratory of Real Time Brain Circuit Tracing in Neurology and Psychiatry (RTBNP_Lab), Tianjin Fourth Center Hospital, The Fourth Central Hospital Affiliated With Nankai University, The Fourth Central Hospital Affiliated to Tianjin Medical University, Tianjin, China.,Laboratory of Neuro-Imaging and Comorbidity (PNGC_Lab), Tianjin Anding Hospital Affiliated to Nankai University, Tianjin Medical University, Tianjin, China
| | - Chunhua Zhou
- Department of Pharmacology, The First Hospital Affiliated to Hebei Medical University, Shijiazhuang, China
| | - Qianchen Li
- Department of Pharmacology, The First Hospital Affiliated to Hebei Medical University, Shijiazhuang, China
| | - Jie Liu
- Laboratory of Neuro-Imaging and Comorbidity (PNGC_Lab), Tianjin Anding Hospital Affiliated to Nankai University, Tianjin Medical University, Tianjin, China
| | - Shuli Xu
- Laboratory of Neuro-Imaging and Comorbidity (PNGC_Lab), Tianjin Anding Hospital Affiliated to Nankai University, Tianjin Medical University, Tianjin, China
| | - Cong Yao
- Laboratory of Neuro-Imaging and Comorbidity (PNGC_Lab), Tianjin Anding Hospital Affiliated to Nankai University, Tianjin Medical University, Tianjin, China
| | - Weiliang Yang
- Laboratory of Neuro-Imaging and Comorbidity (PNGC_Lab), Tianjin Anding Hospital Affiliated to Nankai University, Tianjin Medical University, Tianjin, China
| | - Anqu Yang
- Department of Treatment Resistant Schizophrenia, Tianjin Kangtai Hospital, Tianjin, China
| | - Bo Li
- Department of Treatment Resistant Schizophrenia, Tianjin Kangtai Hospital, Tianjin, China
| | - Yuhui Chen
- Department of Treatment Resistant Schizophrenia, Tianjin Kangtai Hospital, Tianjin, China
| | - Hongjun Tian
- Key Laboratory of Multiple Organ Damages of Major Psychoses (MODMP_Lab), Tianjin Fourth Center Hospital, The Fourth Central Hospital Affiliated With Nankai University, The Fourth Central Hospital Affiliated to Tianjin Medical University, Tianjin, China.,Key Laboratory of Real Time Brain Circuit Tracing in Neurology and Psychiatry (RTBNP_Lab), Tianjin Fourth Center Hospital, The Fourth Central Hospital Affiliated With Nankai University, The Fourth Central Hospital Affiliated to Tianjin Medical University, Tianjin, China
| | - Chongguang Lin
- Department of Psychiatry, Wenzhou Seventh Peoples Hospital, Wenzhou, China
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Silva KSC, Aquino NSS, Gusmao DO, Henriques PC, Reis AM, Szawka RE. Reduced dopaminergic tone during lactation is permissive to the hypothalamic stimulus for suckling-induced prolactin release. J Neuroendocrinol 2020; 32:e12880. [PMID: 32627906 DOI: 10.1111/jne.12880] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 05/04/2020] [Accepted: 06/02/2020] [Indexed: 12/25/2022]
Abstract
Dopamine from tuberoinfundibular dopaminergic (TIDA) neurones tonically inhibits prolactin (PRL) secretion. Lactational hyperprolactinaemia is associated with a reduced activity of TIDA neurones. However, it remains controversial whether the suckling-induced PRL surge is driven by an additional decrease in dopamine release or by stimulation from a PRL-releasing factor. In the present study, we further investigated the role of dopamine in the PRL response to suckling. Non-lactating (N-Lac), lactating 4 hour apart from pups (Lac), Lac with pups return and suckling (Lac+S), and post-lactating (P-Lac) rats were evaluated. PRL levels were elevated in Lac rats and increased linearly within 30 minutes of suckling in Lac+S rats. During the rise in PRL levels, dopamine and 3,4-dihydroxyphenylacetic acid (DOPAC) levels in the median eminence (ME) and neurointermediate lobe of the pituitary did not differ between Lac+S and Lac rats. However, dopamine and DOPAC were equally decreased in Lac and Lac+S compared to N-Lac and P-Lac rats. Suckling, in turn, reduced phosphorylation of tyrosine hydroxylase in the ME of Lac+S. Domperidone and bromocriptine were used to block and activate pituitary dopamine D2 receptors, respectively. Domperidone increased PRL secretion in both N-Lac and Lac rats, and suckling elicited a robust surge of PRL over the high basal levels in domperidone-treated Lac+S rats. Conversely, bromocriptine blocked the PRL response to suckling. The findings obtained in the present study provide evidence that dopamine synthesis and release are tonically reduced during lactation, whereas dopamine is still functional with respect to inhibiting PRL secretion. However, there appears to be no further reduction in dopamine release associated with the suckling-induced rise in PRL. Instead, the lower dopaminergic tone during lactation appears to be required to sensitise the pituitary to a suckling-induced PRL-releasing factor.
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Affiliation(s)
- Kaoma S C Silva
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Nayara S S Aquino
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Daniela O Gusmao
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Patricia C Henriques
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Adelina M Reis
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Raphael E Szawka
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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7
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Yip SH, Araujo-Lopes R, Szawka RE, York J, Hyland B, Grattan DR, Bunn SJ. Morphological plasticity of the tuberoinfundibular dopaminergic neurones in the rat during the oestrous cycle and lactation. J Neuroendocrinol 2020; 32:e12884. [PMID: 32662600 DOI: 10.1111/jne.12884] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/04/2020] [Accepted: 06/11/2020] [Indexed: 01/10/2023]
Abstract
The hypothalamic tuberoinfundibular dopaminergic (TIDA) neurones are critical with respect to regulating prolactin secretion from the anterior pituitary. Under most physiological conditions, they are stimulated by prolactin to release dopamine into the median eminence which subsequently suppresses further prolactin secretion from the lactotrophs. During lactation, the TIDA neurones are known to undergo both electrophysiological and neurochemical changes that alleviate this negative-feedback, thus allowing circulating prolactin levels to rise. The present study aimed to determine whether TIDA neurone morphology, most notably spine density, is also modified during lactation. This was achieved by stereotaxically injecting the arcuate nucleus of female, tyrosine hydroxylase-promoter driven Cre-recombinase transgenic rats with Cre-dependent adeno-associated virus-expressing Brainbow. This resulted in the highly specifici transfection of between 10% and 30% of the TIDA neurones, thus allowing the morphologies on multiple individual neurones to be examined in a single hypothalamic slice. The transfected neurones exhibited a range of complex forms, including a diversity of soma and location of axonal origin. Neuronal spine counting showed that the density of somatic, but not dendritic, spines was significantly higher during lactation than at any other reproductive stage. There was also a significant fall in somatic spine density across the oestrous cycle from dioestrus to oestrus. Although the functional characteristics of the additional somatic spines have not been determined, if, as might be expected, they represent an increased excitatory input to the TIDA neurones, this could have important physiological implications by perhaps supporting altered neurotransmitter release at their neuroendocrine terminals. Enhanced excitatory input may, for example, favour the release of the opioid peptide enkephalin rather than dopamine, which is potentially significant because the expression of the peptide is known to increase in the TIDA neurones during lactation and, in contrast to dopamine, it stimulates rather than inhibits prolactin secretion from the pituitary.
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Affiliation(s)
- Siew Hoong Yip
- Centre for Neuroendocrinology and Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - Roberta Araujo-Lopes
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Raphael E Szawka
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Jade York
- Centre for Neuroendocrinology and Department of Anatomy, University of Otago, Dunedin, New Zealand
| | - Brian Hyland
- Department of Physiology, 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
| | - Stephen J Bunn
- Centre for Neuroendocrinology and Department of Anatomy, University of Otago, Dunedin, New Zealand
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A Neuro-hormonal Circuit for Paternal Behavior Controlled by a Hypothalamic Network Oscillation. Cell 2020; 182:960-975.e15. [PMID: 32763155 PMCID: PMC7445434 DOI: 10.1016/j.cell.2020.07.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 10/21/2019] [Accepted: 07/09/2020] [Indexed: 02/08/2023]
Abstract
Parental behavior is pervasive throughout the animal kingdom and essential for species survival. However, the relative contribution of the father to offspring care differs markedly across animals, even between related species. The mechanisms that organize and control paternal behavior remain poorly understood. Using Sprague-Dawley rats and C57BL/6 mice, two species at opposite ends of the paternal spectrum, we identified that distinct electrical oscillation patterns in neuroendocrine dopamine neurons link to a chain of low dopamine release, high circulating prolactin, prolactin receptor-dependent activation of medial preoptic area galanin neurons, and paternal care behavior in male mice. In rats, the same parameters exhibit inverse profiles. Optogenetic manipulation of these rhythms in mice dramatically shifted serum prolactin and paternal behavior, whereas injecting prolactin into non-paternal rat sires triggered expression of parental care. These findings identify a frequency-tuned brain-endocrine-brain circuit that can act as a gain control system determining a species’ parental strategy. Species-specific hypothalamic dopamine neuron rhythms yield distinct prolactin release Serum prolactin primes the “parental” neural circuit for pup care during fatherhood Optogenetic control of TIDA frequency tunes prolactin and paternal behavior Prolactin receptors in the MPOA are required for paternal behavior
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