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Li Y, Zhou L, Xiao L, Wang H, Wang G. Wheel Running During Pregnancy Alleviates Anxiety-and Depression-Like Behaviors During the Postpartum Period in Mice: The Roles of NLRP3 Neuroinflammasome Activation, Prolactin, and the Prolactin Receptor in the Hippocampus. Neurochem Res 2024; 49:2615-2635. [PMID: 38904910 DOI: 10.1007/s11064-024-04180-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 05/05/2024] [Accepted: 05/22/2024] [Indexed: 06/22/2024]
Abstract
Despite the increase in the prevalence of postpartum depression among maternal disorder, its treatment outcomes remain suboptimal. Studies have shown that exercise can reduce postpartum depressive episodes in the mother, but the effects of exercise during pregnancy on maternal behavior and the potential mechanisms involved remain poorly understood. From the second day of pregnancy to the day of birth, dams exercised for 1 h a day by running on a controlled wheel. The maternal behaviors of the dams were assessed on postpartum day 2 to postpartum day 8. Chronic restraint stress was applied from postpartum day 2 to day 12. Blood was collected on postpartum days 3 and 8, then subjected to ELISA to determine the serum concentration of prolactin. The weight of each dam and the food intake were recorded. Anxiety- and depression-like behavioral tests were conducted, and hippocampal neuroinflammation and prolactin receptor levels were measured. The dams exhibited elevated levels of anxiety and depression, decreased serum prolactin levels, decreased prolactin receptor expression, and activation of NLRP3-mediated neuroinflammation in the hippocampus following the induction of postpartum chronic restraint stress, which were reversed with controlled wheel running during pregnancy. Overall, the findings of this study revealed that the preventive effects of exercise during pregnancy on postpartum anxiety-and depression-like behaviors were accompanied by increased serum prolactin levels, hippocampal prolactin receptor expression and hippocampal NLRP3-mediated neuroinflammation.
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Affiliation(s)
- Yixin Li
- Department of Psychiatry, Renmin Hospital of Wuhan University, Jiefang Road No. 238, Wuhan, 430060, China
| | - Lin Zhou
- Department of Psychiatry, Renmin Hospital of Wuhan University, Jiefang Road No. 238, Wuhan, 430060, China
| | - Ling Xiao
- Department of Psychiatry, Renmin Hospital of Wuhan University, Jiefang Road No. 238, Wuhan, 430060, China
| | - Huiling Wang
- Department of Psychiatry, Renmin Hospital of Wuhan University, Jiefang Road No. 238, Wuhan, 430060, China
| | - Gaohua Wang
- Department of Psychiatry, Renmin Hospital of Wuhan University, Jiefang Road No. 238, Wuhan, 430060, China.
- Institute of Neuropsychiatry, Renmin Hospital of Wuhan University, Jiefang Road No. 238, Wuhan, 430060, China.
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Basulto-Natividad A, Coria-Avila GA, Aranda-Abreu GE, Manzo J, Toledo-Cárdenas R, Hernández-Aguilar ME, Herrera-Covarrubias D. The impact of subchronic hypercaloric and restriction diets on sexual behavior, serum testosterone, and prostate histology in rats. Physiol Behav 2023; 271:114338. [PMID: 37619818 DOI: 10.1016/j.physbeh.2023.114338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 08/11/2023] [Accepted: 08/22/2023] [Indexed: 08/26/2023]
Abstract
The role of diet in health is crucial, with calorie intake playing a significant role. Hypercaloric diets (HD) often lead to adipose tissue accumulation and increased risk of chronic diseases, including reproductive impairments. By contrast, restriction diets (RD) help with weight loss, improve cardiovascular function, and ameliorate reproduction. Herein we sought to investigate the impact of subchronic HD and RD on body weight, sexual behavior, serum testosterone and prostate histology in rats. Hence, 10-week old male rats gained sexual experience during five trials with ovariectomized, hormone-primed females. Then at postnatal week PW15 the males were organized in three groups, depending on the feeding they received until PW18: HD, RD and standard diet (SD). During PW19-22 they were tested for sexual behavior, and at PW23 were euthanized for prostate histology (hematoxylin & eosin stain) and hormone analysis. Results indicated that HD males increased their body weight (16-23%) compared to SD and RD. Furthermore, HD males showed 65% less testosterone than RD males. The prostate of HD males revealed histological alterations, including a notable increase in epithelium height and other abnormal features, while no changes were observed in the performance of sexual behavior between HD and RD, although HD appeared to facilitate ejaculation when compared to SD. The histological features of RD males were comparable to SD males. Accordingly, we argue that subchronic modifications in calorie intake can alter body weight (in HD), serum testosterone levels (HD and RD in opposite directions), and prostate histology (in HD), while having no immediate effect on male sexual behavior.
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Affiliation(s)
| | | | | | - Jorge Manzo
- Instituto de Investigaciones Cerebrales, Universidad Veracruzana, Mexico
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Fonseca CS, Aquino NSS, Goncalves GKN, Drummond LR, Hipolito LTM, Silva JF, Silva KSC, Henriques PC, Domingues TE, Lacerda ACR, Guatimosim S, Coimbra CC, Szawka RE, Reis AM. Norepinephrine modulation of heat dissipation in female rats lacking estrogen. J Neuroendocrinol 2022; 34:e13188. [PMID: 36306200 DOI: 10.1111/jne.13188] [Citation(s) in RCA: 1] [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: 04/05/2022] [Revised: 06/10/2022] [Accepted: 07/15/2022] [Indexed: 11/27/2022]
Abstract
Postmenopausal hot flushes are caused by lack of estradiol (E2) but their neuroendocrine basis is still poorly understood. Here, we investigated the interrelationship between norepinephrine and hypothalamic neurons, with emphasis on kisspeptin neurons in the arcuate nucleus (ARC), as a regulatory pathway in the vasomotor effects of E2. Ovariectomized (OVX) rats displayed increased tail skin temperature (TST), and this increase was prevented in OVX rats treated with E2 (OVX + E2). Expression of Fos in the hypothalamus and the number of ARC kisspeptin neurons coexpressing Fos were increased in OVX rats. Likewise, brainstem norepinephrine neurons of OVX rats displayed higher Fos immunoreactivity associated with the increase in TST. In the ARC, the density of dopamine-ß-hydroxylase (DBH)-immunoreactive (ir) fibers was not altered by E2 but, importantly, DBH-ir terminals were found in close apposition to kisspeptin cells, revealing norepinephrine inputs to ARC kisspeptin neurons. Intracerebroventricular injection of the α2-adrenergic agonist clonidine (CLO) was used to reduce central norepinephrine release, confirmed by the decreased 3-methoxy-4-hydroxyphenylglycol/norepinephrine ratio in the preoptic area and ARC. Accordingly, CLO treatment in OVX rats reduced ARC Kiss1 mRNA levels and TST to the values of OVX + E2 rats. Conversely, CLO stimulated Kiss1 expression in the anteroventral periventricular nucleus (AVPV) and increased luteinizing hormone secretion. These findings provide evidence that augmented heat dissipation in OVX rats involves the increase in central norepinephrine that modulates hypothalamic areas related to thermoregulation, including ARC kisspeptin neurons. This neuronal network is suppressed by E2 and its imbalance may be implicated in the vasomotor symptoms of postmenopausal hot flushes.
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Affiliation(s)
- Cristina S Fonseca
- 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
| | - Gleisy K N Goncalves
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Lucas R Drummond
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Laisa T M Hipolito
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Juneo F Silva
- Centro de Microscopia Eletronica, Departamento de Ciencias Biologicas, Universidade Estadual de Santa Cruz, Ilheus, Brazil
| | - Kaoma S C Silva
- 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
| | - Talita E Domingues
- Faculdade de Ciencias Biologicas e da Saude, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Ana C R Lacerda
- Faculdade de Ciencias Biologicas e da Saude, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Silvia Guatimosim
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Candido C Coimbra
- 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
| | - Adelina M Reis
- Departamento de Fisiologia e Biofisica, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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Marciniak E, Młotkowska P, Roszkowicz-Ostrowska K, Ciska E, Misztal T. Involvement of neurosteroids in the control of prolactin secretion in sheep under basal, stressful and pregnancy conditions. Theriogenology 2022; 190:73-80. [DOI: 10.1016/j.theriogenology.2022.08.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 07/25/2022] [Accepted: 08/02/2022] [Indexed: 12/01/2022]
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Nappi RE, Di Ciaccio S, Genazzani AD. Prolactin as a neuroendocrine clue in sexual function of women across the reproductive life cycle: an expert point of view. Gynecol Endocrinol 2021; 37:490-496. [PMID: 33703987 DOI: 10.1080/09513590.2021.1897783] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Prolactin is a proteic hormone best known for its role in enabling the production of milk by female mammals. Secreted by the pituitary gland in response to the stimuli of eating, estrogen treatment, mating, ovulation and nursing, prolactin is involved in over 300 separate processes in a range of vertebrates, including humans. The hormone is released in a pulsatile manner and plays an essential role in metabolism, as well as in the regulation of the immune system and pancreatic development. Nevertheless, prolactin exerts other relevant roles, as it acts at the central nervous system level to modulate behavior, arousal and sexuality. In this experts' opinion, we aim to give insights into the main activities of prolactin to advance the ability of medical doctors and specialists in obstetrics and gynecology to provide more emphasis in their clinical practices to the link between prolactin and sexuality.
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Affiliation(s)
- Rossella E Nappi
- Research Center for Reproductive Medicine, Gynecological Endocrinology and Menopause, IRCCS San Matteo Foundation, Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy
| | | | - Alessandro D Genazzani
- Gynecological Endocrinology Center, Department of Obstetrics and Gynecology, University of Modena and Reggio Emilia, Modena, Italy
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Arikawe AP, Rorato RC, Gomes N, Elias LL, Anselmo-Franci J. Hormonal and neural responses to restraint stress in an animal model of perimenopause in female rats. J Neuroendocrinol 2021; 33:e12976. [PMID: 33900672 DOI: 10.1111/jne.12976] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 03/23/2021] [Accepted: 03/28/2021] [Indexed: 01/21/2023]
Abstract
The present study investigated the hormonal and neural responses to stress in a perimenopause animal model induced by 4-vinylcyclohexene diepoxide (VCD), which induces progressive follicular depletion in rodents, allowing studies on the transition to ovarian failure. Female rats, aged 28 days old, were s.c. injected for 15 consecutive days with corn oil or VCD. At 85 ± 5 days after the onset of treatment, the jugular vein was cannulated in the afternoon of metoestrus and in next morning (dioestrus) at 10.00 am, rats were subjected to 30 minutes of restraint stress. Blood samples were withdrawn before (-5 minutes), during (2, 5, 15 and 30 minutes) and after (45, 60 and 90 minutes) stress and plasma prolactin, progesterone and corticosterone levels were measured. Animals were perfused, brains processed for c-Fos/tyrosine hydroxylase (TH) in the locus coeruleus (LC) and c-Fos/corticotrophin-releasing factor (CRF) in the paraventricular nucleus (PVN). In unstressed rats the density of β-endorphin fibres was assessed in LC and PVN. In VCD-treated rats, stress-induced prolactin peak was higher, basal and peak progesterone levels were lower, and both levels of corticosterone were similar to controls. However, the recovery period was longer for both adrenal hormones. In VCD-treated rats the number of c-Fos/TH and c-Fos/CRF-immunoreactive neurones was higher whereas the density of β-endorphin fibres was lower in LC and PVN. We surmise that the hyperactivity of the LC and PVN neurones in VCD-treated rats may be a result of the lower progesterone levels that resulted in the decrease of β-endorphin content in both nuclei, thus impairing the negative-feedback mechanism in the recovery period.
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Affiliation(s)
- Adesina Paul Arikawe
- Laboratory of Neuroendocrinology, Department of Basic and Oral Biology Pathology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
- Department of Physiology, Faculty of Basic Medical Sciences, College of Medicine, University of Lagos, Lagos, Nigeria
| | - Rodrigo César Rorato
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
- Departmento de Biofísica, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Nathali Gomes
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Lucila Leico Elias
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | - Janete Anselmo-Franci
- Laboratory of Neuroendocrinology, Department of Basic and Oral Biology Pathology, School of Dentistry of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
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Tsur A, Dreyfuss E, Ness-Abramof R, Pollack R, Cahn A. Role of Cannulated Prolactin Test in Evaluation of Hyperprolactinemia - A Retrospective Study. Endocr Pract 2021; 26:1304-1311. [PMID: 33471661 DOI: 10.4158/ep-2020-0260] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 06/24/2020] [Indexed: 11/15/2022]
Abstract
OBJECTIVE While guidelines propose a single elevated prolactin measurement drawn without excess venipuncture stress as sufficient for diagnosing hyperprolactinemia, this may lead to unnecessary evaluation in the setting of stress-induced hyperprolactinemia. In this study, we aimed to define the role of the cannulated prolactin test in confirming hyperprolactinemia. METHODS We conducted a retrospective review of 757 patients with unexplained hyperprolactinemia who performed a cannulated prolactin test in a community-based referral endocrine clinic between 2000-2015. The prolactin test consisted of "test-baseline" levels taken at rest (T0), and cannulated measurements at 60 and 90 minutes (T60 and T90) without repeated venipuncture. The most recent prolactin level performed prior to the test (referral-prolactin) was collected. RESULTS Referral-prolactin was available for 621 (82%) patients, of whom 324 (52.2%) normalized at T0. The probability of normoprolactinemia at T0 was 50% if referral-prolactin was 2.0-fold the upper-limit-of-normal (ULN), yet only 5% if referral-prolactin was 5.0-fold the ULN. Of the 359 patients with hyperprolactinemia at T0, prolactin normalized at T60 and/or T90 in 99 (27.6%) patients. The probability of normoprolactinemia was low (<5%) in those with T0 prolactin levels >2.4-fold ULN. Overall, of 757 prolactin tests performed, only 260 (34.3%) patients had persistent hyperprolactinemia. CONCLUSION Patients with referral-prolactin levels >5.0-fold the ULN, or a rested-prolactin (T0) >2.4-fold the ULN are unlikely to normalize during the cannulated test and consideration should be made to proceed directly with pituitary imaging. In patients with prolactin levels below these thresholds, the cannulated prolactin test may considerably reduce unnecessary investigations, treatment, and cost.
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Affiliation(s)
- Anat Tsur
- From the Department of Endocrinology and Metabolism, Clalit Health Services, Jerusalem, Israel; Hebrew University, The Faculty of Medicine, Jerusalem, Israel.
| | | | - Rosane Ness-Abramof
- the Department of Endocrinology and Metabolism, Clalit Health Services, Tel Aviv district, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Rena Pollack
- Hebrew University, The Faculty of Medicine, Jerusalem, Israel; the Department of Endocrinology and Metabolism, Hadassah Medical Center, Jerusalem, Israel
| | - Avivit Cahn
- Hebrew University, The Faculty of Medicine, Jerusalem, Israel; the Department of Endocrinology and Metabolism, Hadassah Medical Center, Jerusalem, Israel
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Valente S, Marques T, Lima SQ. No evidence for prolactin's involvement in the post-ejaculatory refractory period. Commun Biol 2021; 4:10. [PMID: 33398068 PMCID: PMC7782750 DOI: 10.1038/s42003-020-01570-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 12/04/2020] [Indexed: 01/18/2023] Open
Abstract
In many species, ejaculation is followed by a state of decreased sexual activity, the post-ejaculatory refractory period. Several lines of evidence have suggested prolactin, a pituitary hormone released around the time of ejaculation in humans and other animals, to be a decisive player in the establishment of the refractory period. However, data supporting this hypothesis is controversial. We took advantage of two different strains of house mouse, a wild derived and a classical laboratory strain that differ substantially in their sexual performance, to investigate prolactin's involvement in sexual activity and the refractory period. First, we show that there is prolactin release during sexual behavior in male mice. Second, using a pharmacological approach, we show that acute manipulations of prolactin levels, either mimicking the natural release during sexual behavior or inhibiting its occurrence, do not affect sexual activity or shorten the refractory period, respectively. Therefore, we show compelling evidence refuting the idea that prolactin released during copulation is involved in the establishment of the refractory period, a long-standing hypothesis in the field of behavioral endocrinology.
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Affiliation(s)
- Susana Valente
- Champalimaud Research, Champalimaud Centre for the Unknown, Av. Brasilia, s/n Lisboa, Portugal
- Graduate Program in Areas of Basic and Applied Biology (GABBA), University of Porto, 4200-465, Porto, Portugal
| | - Tiago Marques
- Department of Brain and Cognitive Sciences, MIT, Cambridge, MA, 02139, USA
- McGovern Institute for Brain Research, MIT, Cambridge, MA, 02139, USA
- Center for Brains, Minds and Machines, MIT, Cambridge, MA, 02139, USA
| | - Susana Q Lima
- Champalimaud Research, Champalimaud Centre for the Unknown, Av. Brasilia, s/n Lisboa, Portugal.
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Dzhalilova D, Makarova O. Differences in Tolerance to Hypoxia: Physiological, Biochemical, and Molecular-Biological Characteristics. Biomedicines 2020; 8:E428. [PMID: 33080959 PMCID: PMC7603118 DOI: 10.3390/biomedicines8100428] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 10/14/2020] [Accepted: 10/15/2020] [Indexed: 02/07/2023] Open
Abstract
Hypoxia plays an important role in the development of many infectious, inflammatory, and tumor diseases. The predisposition to such disorders is mostly provided by differences in basic tolerance to oxygen deficiency, which we discuss in this review. Except the direct exposure of different-severity hypoxia in decompression chambers or in highland conditions, there are no alternative methods for determining organism tolerance. Due to the variability of the detection methods, differences in many parameters between tolerant and susceptible organisms are still not well-characterized, but some of them can serve as biomarkers of susceptibility to hypoxia. At the moment, several potential biomarkers in conditions after hypoxic exposure have been identified both in experimental animals and humans. The main potential biomarkers are Hypoxia-Inducible Factor (HIF)-1, Heat-Shock Protein 70 (HSP70), and NO. Due to the different mechanisms of various high-altitude diseases, biomarkers may not be highly specific and universal. Therefore, it is extremely important to conduct research on hypoxia susceptibility biomarkers. Moreover, it is important to develop a method for the evaluation of organisms' basic hypoxia tolerance without the necessity of any oxygen deficiency exposure. This can contribute to new personalized medicine approaches' development for diagnostics and the treatment of inflammatory and tumor diseases, taking into account hypoxia tolerance differences.
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Affiliation(s)
- Dzhuliia Dzhalilova
- Department of Immunomorphology of Inflammation, Federal State Budgetary Institution ‘Research Institute of Human Morphology’, Moscow 117418, Russia;
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Dandawate P, Kaushik G, Ghosh C, Standing D, Sayed AAA, Choudhury S, Subramaniam D, Manzardo A, Banerjee T, Santra S, Ramamoorthy P, Butler M, Padhye SB, Baranda J, Kasi A, Sun W, Tawfik O, Coppola D, Malafa M, Umar S, Soares MJ, Saha S, Weir SJ, Dhar A, Jensen RA, Thomas SM, Anant S. Diphenylbutylpiperidine Antipsychotic Drugs Inhibit Prolactin Receptor Signaling to Reduce Growth of Pancreatic Ductal Adenocarcinoma in Mice. Gastroenterology 2020; 158:1433-1449.e27. [PMID: 31786131 PMCID: PMC7103550 DOI: 10.1053/j.gastro.2019.11.279] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 11/04/2019] [Accepted: 11/19/2019] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS Prolactin (PRL) signaling is up-regulated in hormone-responsive cancers. The PRL receptor (PRLR) is a class I cytokine receptor that signals via the Janus kinase (JAK)-signal transducer and activator of transcription and mitogen-activated protein kinase pathways to regulate cell proliferation, migration, stem cell features, and apoptosis. Patients with pancreatic ductal adenocarcinoma (PDAC) have high plasma levels of PRL. We investigated whether PRLR signaling contributes to the growth of pancreatic tumors in mice. METHODS We used immunohistochemical analyses to compare levels of PRL and PRLR in multitumor tissue microarrays. We used structure-based virtual screening and fragment-based drug discovery to identify compounds likely to bind PRLR and interfere with its signaling. Human pancreatic cell lines (AsPC-1, BxPC-3, Panc-1, and MiaPaCa-2), with or without knockdown of PRLR (clustered regularly interspaced short palindromic repeats or small hairpin RNA), were incubated with PRL or penfluridol and analyzed in proliferation and spheroid formation. C57BL/6 mice were given injections of UNKC-6141 cells, with or without knockdown of PRLR, into pancreas, and tumor development was monitored for 4 weeks, with some mice receiving penfluridol treatment for 21 days. Human pancreatic tumor tissues were implanted into interscapular fat pads of NSG mice, and mice were given injections of penfluridol daily for 28 days. Nude mice were given injections of Panc-1 cells, xenograft tumors were grown for 2 weeks, and mice were then given intraperitoneal penfluridol for 35 days. Tumors were collected from mice and analyzed by histology, immunohistochemistry, and immunoblots. RESULTS Levels of PRLR were increased in PDAC compared with nontumor pancreatic tissues. Incubation of pancreatic cell lines with PRL activated signaling via JAK2-signal transducer and activator of transcription 3 and extracellular signal-regulated kinase, as well as formation of pancospheres and cell migration; these activities were not observed in cells with PRLR knockdown. Pancreatic cancer cells with PRLR knockdown formed significantly smaller tumors in mice. We identified several diphenylbutylpiperidine-class antipsychotic drugs as agents that decreased PRL-induced JAK2 signaling; incubation of pancreatic cancer cells with these compounds reduced their proliferation and formation of panco spheres. Injections of 1 of these compounds, penfluridol, slowed the growth of xenograft tumors in the different mouse models, reducing proliferation and inducing autophagy of the tumor cells. CONCLUSIONS Levels of PRLR are increased in PDAC, and exposure to PRL increases proliferation and migration of pancreatic cancer cells. Antipsychotic drugs, such as penfluridol, block PRL signaling in pancreatic cancer cells to reduce their proliferation, induce autophagy, and slow the growth of xenograft tumors in mice. These drugs might be tested in patients with PDAC.
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Affiliation(s)
- Prasad Dandawate
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160
| | - Gaurav Kaushik
- Department of Surgery, University of Kansas Medical Center, Kansas City, KS 66160
| | - Chandrayee Ghosh
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160
| | - David Standing
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160
| | - Afreen Asif Ali Sayed
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160
| | - Sonali Choudhury
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160
| | | | - Ann Manzardo
- Department of Psychiatry and Behavioral Sciences, University of Kansas Medical Center, Kansas City, KS 66160
| | - Tuhina Banerjee
- Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762, USA
| | - Santimukul Santra
- Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762, USA
| | - Prabhu Ramamoorthy
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160
| | - Merlin Butler
- Department of Psychiatry and Behavioral Sciences, University of Kansas Medical Center, Kansas City, KS 66160
| | - Subhash B. Padhye
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160, Interdisciplinary Science and Technology Research Academy, Abeda Inamdar College, University of Pune, Pune 411001
| | - Joaquina Baranda
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160
| | - Anup Kasi
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160
| | - Weijing Sun
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, KS 66160
| | - Ossama Tawfik
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66160
| | - Domenico Coppola
- Department of Gastrointestinal Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Mokenge Malafa
- Department of Gastrointestinal Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612
| | - Shahid Umar
- Department of Surgery, University of Kansas Medical Center, Kansas City, KS 66160
| | - Michael J. Soares
- Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66160, Department of Obstetrics and Gynecology, University of Kansas Medical Center, Kansas City, KS 66160, Department of Pediatrics, University of Kansas Medical Center, Kansas City, KS 66160, Center for Perinatal Research, Children’s Research Institute, Children’s Mercy-Kansas City, MO 64108
| | - Subhrajit Saha
- Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, KS 66160
| | - Scott J. Weir
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160, Department of Pharmacology, Toxicology and Therapeutics, University of Kansas Medical Center, Kansas City, KS 66160
| | - Animesh Dhar
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160
| | - Roy A. Jensen
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160, Department of Pathology and Laboratory Medicine, University of Kansas Medical Center, Kansas City, KS 66160
| | - Sufi Mary Thomas
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, KS 66160, Department of Otolaryngology, University of Kansas Medical Center, Kansas City, KS 66160
| | - Shrikant Anant
- Department of Cancer Biology, University of Kansas Medical Center, Kansas City, Kansas; Department of Surgery, University of Kansas Medical Center, Kansas City, Kansas; Interdisciplinary Science and Technology Research Academy, Abeda Inamdar College, University of Pune, Pune.
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11
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Cabrera-Reyes EA, Limón-Morales O, Rivero-Segura NA, Camacho-Arroyo I, Cerbón M. Prolactin function and putative expression in the brain. Endocrine 2017. [PMID: 28634745 DOI: 10.1007/s12020-017-1346-x] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
INTRODUCTION Prolactin is a peptide hormone mainly synthetized and secreted by the anterior pituitary gland, but also by extrapituitary tissues, such as mammary gland, decidua, prostate, skin, and possibly the brain. Similarly, prolactin receptor is expressed in the pituitary gland, many peripheral tissues, and in contrast to prolactin, its receptor has been consistently detected in several brain regions, such as cerebral cortex, olfactory bulb, hypothalamus, hippocampus, amygdala, among others. Classically, prolactin function has been related to the stimulation of lactogenesis and galactopoiesis, however, it is well known that prolactin induces a wide range of functions in different brain areas. PURPOSE The aim of this review is to summarize recent reports on prolactin and prolactin receptor synthesis and localization, as well as recapitulate both the classic functions attributed to this hormone in the brain and the recently described functions such as neurogenesis, neurodevelopment, sleep, learning and memory, and neuroprotection. CONCLUSION The distribution and putative expression of prolactin and its receptors in several neuronal tissues suggests that this hormone has pleiotropic functions in the brain.
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Affiliation(s)
- Erika Alejandra Cabrera-Reyes
- Unidad de Investigación en Reproducción Humana Instituto Nacional de Perinatología-Facultad de Química, Universidad Nacional Autónoma de México. CDMX, Mexico, Mexico
| | - Ofelia Limón-Morales
- Unidad de Investigación en Reproducción Humana Instituto Nacional de Perinatología-Facultad de Química, Universidad Nacional Autónoma de México. CDMX, Mexico, Mexico
| | - Nadia Alejandra Rivero-Segura
- Unidad de Investigación en Reproducción Humana Instituto Nacional de Perinatología-Facultad de Química, Universidad Nacional Autónoma de México. CDMX, Mexico, Mexico
| | - Ignacio Camacho-Arroyo
- Unidad de Investigación en Reproducción Humana Instituto Nacional de Perinatología-Facultad de Química, Universidad Nacional Autónoma de México. CDMX, Mexico, Mexico
| | - Marco Cerbón
- Unidad de Investigación en Reproducción Humana Instituto Nacional de Perinatología-Facultad de Química, Universidad Nacional Autónoma de México. CDMX, Mexico, Mexico.
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12
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Clapp C, Adán N, Ledesma-Colunga MG, Solís-Gutiérrez M, Triebel J, Martínez de la Escalera G. The role of the prolactin/vasoinhibin axis in rheumatoid arthritis: an integrative overview. Cell Mol Life Sci 2016; 73:2929-48. [PMID: 27026299 PMCID: PMC11108309 DOI: 10.1007/s00018-016-2187-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 03/08/2016] [Accepted: 03/18/2016] [Indexed: 12/29/2022]
Abstract
Rheumatoid arthritis (RA) is a chronic, autoimmune, inflammatory disease destroying articular cartilage and bone. The female preponderance and the influence of reproductive states in RA have long linked this disease to sexually dimorphic, reproductive hormones such as prolactin (PRL). PRL has immune-enhancing properties and increases in the circulation of some patients with RA. However, PRL also suppresses the immune system, stimulates the formation and survival of joint tissues, acquires antiangiogenic properties upon its cleavage to vasoinhibins, and protects against joint destruction and inflammation in the adjuvant-induced model of RA. This review addresses risk factors for RA linked to PRL, the effects of PRL and vasoinhibins on joint tissues, blood vessels, and immune cells, and the clinical and experimental data associating PRL with RA. This information provides important insights into the pathophysiology of RA and highlights protective actions of the PRL/vasoinhibin axis that could lead to therapeutic benefits.
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MESH Headings
- Angiogenesis Inhibitors/immunology
- Animals
- Arthritis, Rheumatoid/epidemiology
- Arthritis, Rheumatoid/immunology
- Arthritis, Rheumatoid/pathology
- Arthritis, Rheumatoid/physiopathology
- Cartilage, Articular/blood supply
- Cartilage, Articular/immunology
- Cartilage, Articular/pathology
- Cartilage, Articular/physiopathology
- Female
- Humans
- Immune Tolerance
- Immunity, Cellular
- Inflammation/epidemiology
- Inflammation/immunology
- Inflammation/pathology
- Inflammation/physiopathology
- Joints/blood supply
- Joints/immunology
- Joints/pathology
- Joints/physiopathology
- Male
- Prolactin/immunology
- Reproduction
- Sex Factors
- Stress, Physiological
- Stress, Psychological
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Affiliation(s)
- Carmen Clapp
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM, Juriquilla, 76230, Querétaro, Mexico.
| | - Norma Adán
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM, Juriquilla, 76230, Querétaro, Mexico
| | - María G Ledesma-Colunga
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM, Juriquilla, 76230, Querétaro, Mexico
| | - Mariana Solís-Gutiérrez
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM, Juriquilla, 76230, Querétaro, Mexico
| | - Jakob Triebel
- Institute for Clinical Chemistry, Laboratory Medicine and Transfusion Medicine, Paracelsus Medical University, Nuremberg, Germany
| | - Gonzalo Martínez de la Escalera
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM, Juriquilla, 76230, Querétaro, Mexico
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13
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Osterlund CD, Rodriguez-Santiago M, Woodruff ER, Newsom RJ, Chadayammuri AP, Spencer RL. Glucocorticoid Fast Feedback Inhibition of Stress-Induced ACTH Secretion in the Male Rat: Rate Independence and Stress-State Resistance. Endocrinology 2016; 157:2785-98. [PMID: 27145013 PMCID: PMC4929554 DOI: 10.1210/en.2016-1123] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Normal glucocorticoid secretion is critical for physiological and mental health. Glucocorticoid secretion is dynamically regulated by glucocorticoid-negative feedback; however, the mechanisms of that feedback process are poorly understood. We assessed the temporal characteristics of glucocorticoid-negative feedback in vivo using a procedure for drug infusions and serial blood collection in unanesthetized rats that produced a minimal disruption of basal ACTH plasma levels. We compared the negative feedback effectiveness present when stress onset coincides with corticosterone's (CORT) rapidly rising phase (30 sec pretreatment), high plateau phase (15 min pretreatment), or restored basal phase (60 min pretreatment) as well as effectiveness when CORT infusion occurs after the onset of stress (5 min poststress onset). CORT treatment prior to stress onset acted remarkably fast (within 30 sec) to suppress stress-induced ACTH secretion. Furthermore, fast feedback induction did not require rapid increases in CORT at the time of stress onset (hormone rate independent), and those feedback actions were relatively long lasting (≥15 min). In contrast, CORT elevation after stress onset produced limited and delayed ACTH suppression (stress state resistance). There was a parallel stress-state resistance for CORT inhibition of stress-induced Crh heteronuclear RNA in the paraventricular nucleus but not Pomc heteronuclear RNA in the anterior pituitary. CORT treatment did not suppress stress-induced prolactin secretion, suggesting that CORT feedback is restricted to the control of hypothalamic-pituitary-adrenal axis elements of a stress response. These temporal, stress-state, and system-level features of in vivo CORT feedback provide an important physiological context for ex vivo studies of molecular and cellular mechanisms of CORT-negative feedback.
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Affiliation(s)
- Chad D Osterlund
- Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, Colorado 80309
| | | | - Elizabeth R Woodruff
- Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, Colorado 80309
| | - Ryan J Newsom
- Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, Colorado 80309
| | - Anjali P Chadayammuri
- Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, Colorado 80309
| | - Robert L Spencer
- Department of Psychology and Neuroscience, University of Colorado Boulder, Boulder, Colorado 80309
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14
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Wang XW, Cao JB, Lv BS, Mi WD, Wang ZQ, Zhang C, Wang HL, Xu Z. Effect of perioperative dexmedetomidine on the endocrine modulators of stress response: a meta-analysis. Clin Exp Pharmacol Physiol 2016; 42:828-36. [PMID: 26016707 DOI: 10.1111/1440-1681.12431] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 05/06/2015] [Accepted: 05/19/2015] [Indexed: 11/30/2022]
Abstract
This study examined the effects of perioperative dexmedetomidine treatment on physiological modulators of surgical stress response. The quality of the included studies was assessed prior to performing meta-analyses of the weighted mean differences in the changes from baseline of stress hormones and interpreted in the light of statistical heterogeneity between the studies. Nineteen studies (844 surgical subjects) data were used for this meta-analysis. Dexmedetomidine administration significantly decreased blood cortisol levels (μg/dL) postoperatively (mean difference with 95% confidence interval (CI) from controls: -18.78 (-28.45, -9.10); P < 0.05). In the subgroup analysis, the mean difference between dexmedetomidine-treated and saline-treated subjects in the changes from baseline of the cortisol levels was -20.10 (-30.96, -9.25; P < 0.05) but, between dexmedetomidine- and comparator-treated subjects, it was not statistically significantly different (-15.13 (-49.78, 19.52); P < 0.05). Compared with controls, dexmedetomidine treatment also decreased adrenaline and noradrenaline levels significantly (mean difference in the percent changes from baseline: -90.41 (-145.79, -35.03)%; P < 0.05 and -62.82 (-85.47, -0.40.17)%; P < 0.05, respectively). Dexmedetomidine also decreased prolactin levels with a mean difference of -19.42 (-39.37, 0.52) μg/L (P = 0.06). In conclusion, perioperative use of dexmedetomidine reduces serum catecholamine and cortisol levels but the decrease in cortisol levels was not statistically different from the comparator anaesthetics. More data will be required to assess the effects of dexmedetomidine on corticotropin, prolactin, and growth hormone.
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Affiliation(s)
- Xian-wang Wang
- Anaesthesia and Operation Centre, Chinese PLA General Hospital, Beijing, China.,Department of Anaesthesiology, The 309th Hospital of PLA, Beijing, China
| | - Jiang-bei Cao
- Anaesthesia and Operation Centre, Chinese PLA General Hospital, Beijing, China
| | - Bao-sheng Lv
- Department of Anaesthesiology, The 309th Hospital of PLA, Beijing, China
| | - Wei-dong Mi
- Anaesthesia and Operation Centre, Chinese PLA General Hospital, Beijing, China
| | - Zhuo-qiang Wang
- Department of Anaesthesiology, The 309th Hospital of PLA, Beijing, China
| | - Changsheng Zhang
- Anaesthesia and Operation Centre, Chinese PLA General Hospital, Beijing, China
| | - Heng-lin Wang
- Department of Anaesthesiology, The 309th Hospital of PLA, Beijing, China
| | - Zhen Xu
- Department of Anaesthesiology, The 309th Hospital of PLA, Beijing, China
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15
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Torner L. Actions of Prolactin in the Brain: From Physiological Adaptations to Stress and Neurogenesis to Psychopathology. Front Endocrinol (Lausanne) 2016; 7:25. [PMID: 27065946 PMCID: PMC4811943 DOI: 10.3389/fendo.2016.00025] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 03/14/2016] [Indexed: 12/22/2022] Open
Abstract
Prolactin (PRL) is one of the most versatile hormones known. It is considered an adaptive hormone due to the key roles it plays in the modulation of the stress response and during pregnancy and lactation. Within the brain, PRL acts as a neuropeptide to promote physiological responses related to reproduction, stress adaptation, neurogenesis, and neuroprotection. The action of PRL on the nervous system contributes to the wide array of changes that occur in the female brain during pregnancy and result in the attenuation of the hypothalamic-pituitary-adrenal axis. Together, all these changes promote behavioral and physiological adaptations of the new mother to enable reproductive success. Brain adaptations driven by PRL are also important for the regulation of maternal emotionality and well-being. PRL also affects the male brain during the stress response, but its effects have been less studied. PRL regulates neurogenesis both in the subventricular zone and in the hippocampus. Therefore, alterations in the PRL system due to stress or exposure to substances that reduce neurogenesis or other conditions, could contribute to maladaptive responses and pathological behavioral outcomes. Here, we review the PRL system and the role it plays in the modulation of stress response and emotion regulation. We discuss the effects of PRL on neurogenesis and neuroprotection, the putative neuronal mechanisms underlying these effects, and their contribution to the onset of psychopathological states such as depression.
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Affiliation(s)
- Luz Torner
- Neuroendocrinología, Departamento de Neurociencias, Centro de Investigación Biomédica de Michoacán, Instituto Mexicano del Seguro Social, Morelia, Mexico
- *Correspondence: Luz Torner,
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16
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Tartu S, Bustamante P, Angelier F, Lendvai ÁZ, Moe B, Blévin P, Bech C, Gabrielsen GW, Bustnes JO, Chastel O. Mercury exposure, stress and prolactin secretion in an Arctic seabird: an experimental study. Funct Ecol 2015. [DOI: 10.1111/1365-2435.12534] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Sabrina Tartu
- Centre d'Etudes Biologiques de Chizé UMR 7372 CNRS‐Université La Rochelle 79360 Villiers‐en‐Bois France
| | - Paco Bustamante
- Littoral Environnement et Sociétés UMR 7266 CNRS‐Université La Rochelle 17000 La Rochelle France
| | - Frédéric Angelier
- Centre d'Etudes Biologiques de Chizé UMR 7372 CNRS‐Université La Rochelle 79360 Villiers‐en‐Bois France
| | - Ádám Z. Lendvai
- Department of Evolutionary Zoology and Human Biology University of Debrecen Egyetem tér 1. 4032 Debrecen Hungary
| | - Børge Moe
- Norwegian Institute for Nature Research (NINA) Høgskoleringen 9 7034 Trondheim Norway
| | - Pierre Blévin
- Centre d'Etudes Biologiques de Chizé UMR 7372 CNRS‐Université La Rochelle 79360 Villiers‐en‐Bois France
| | - Claus Bech
- Department of Biology Norwegian University of Science and Technology (NTNU), Realfagbygget, Høgskoleringen 5, 7491 Trondheim Norway
| | - Geir W. Gabrielsen
- Norwegian Polar Institute (NPI) FRAM – High North Research Centre for Climate and the Environment 9296 Tromsø Norway
| | - Jan Ove Bustnes
- Norwegian Institute for Nature Research (NINA) FRAM – High North Research Centre for Climate and the Environment 9296 Tromsø Norway
| | - Olivier Chastel
- Centre d'Etudes Biologiques de Chizé UMR 7372 CNRS‐Université La Rochelle 79360 Villiers‐en‐Bois France
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17
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Abstract
The hypothalamic control of prolactin secretion is different from other anterior pituitary hormones, in that it is predominantly inhibitory, by means of dopamine from the tuberoinfundibular dopamine neurons. In addition, prolactin does not have an endocrine target tissue, and therefore lacks the classical feedback pathway to regulate its secretion. Instead, it is regulated by short loop feedback, whereby prolactin itself acts in the brain to stimulate production of dopamine and thereby inhibit its own secretion. Finally, despite its relatively simple name, prolactin has a broad range of functions in the body, in addition to its defining role in promoting lactation. As such, the hypothalamo-prolactin axis has many characteristics that are quite distinct from other hypothalamo-pituitary systems. This review will provide a brief overview of our current understanding of the neuroendocrine control of prolactin secretion, in particular focusing on the plasticity evident in this system, which keeps prolactin secretion at low levels most of the time, but enables extended periods of hyperprolactinemia when necessary for lactation. Key prolactin functions beyond milk production will be discussed, particularly focusing on the role of prolactin in inducing adaptive responses in multiple different systems to facilitate lactation, and the consequences if prolactin action is impaired. A feature of this pleiotropic activity is that functions that may be adaptive in the lactating state might be maladaptive if prolactin levels are elevated inappropriately. Overall, my goal is to give a flavour of both the history and current state of the field of prolactin neuroendocrinology, and identify some exciting new areas of research development.
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Affiliation(s)
- David R Grattan
- Centre for Neuroendocrinology and Department of AnatomyUniversity of Otago, PO Box 913, Dunedin 9054, New ZealandMaurice Wilkins Centre for Molecular BiodiscoveryAuckland, New Zealand Centre for Neuroendocrinology and Department of AnatomyUniversity of Otago, PO Box 913, Dunedin 9054, New ZealandMaurice Wilkins Centre for Molecular BiodiscoveryAuckland, New Zealand
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18
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Stinnett GS, Westphal NJ, Seasholtz AF. Pituitary CRH-binding protein and stress in female mice. Physiol Behav 2015; 150:16-23. [PMID: 25731977 DOI: 10.1016/j.physbeh.2015.02.050] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 02/05/2015] [Accepted: 02/23/2015] [Indexed: 11/30/2022]
Abstract
The CRH-binding protein (CRH-BP) binds CRH with very high affinity and inhibits CRH-mediated ACTH release from anterior pituitary cells in vitro, suggesting that the CRH-BP functions as a negative regulator of CRH activity. Our previous studies have demonstrated sexually dimorphic expression of CRH-BP in the murine pituitary. Basal CRH-BP expression is higher in the female pituitary, where CRH-BP mRNA is detected in multiple anterior pituitary cell types. In this study, we examined stress-induced changes in CRH-BP mRNA and protein expression in mouse pituitary and assessed the in vivo role of CRH-BP in modulating the stress response. Pituitary CRH-BP mRNA was greater than 200-fold more abundant in females than males, and restraint stress increased pituitary CRH-BP mRNA by 11.8-fold in females and 3.2-fold in males as assessed by qRT-PCR. In females, restraint stress increased CRH-BP mRNA levels not only in POMC-expressing cells, but also in PRL-expressing cells. The increase in female pituitary CRH-BP mRNA following stress resulted in significant increases in CRH-BP protein 4-6h after a 30-minute restraint stress as detected by [(125)I]-CRH:CRH-BP cross-linking analyses. Based on this temporal profile, the physiological role of CRH-BP was assessed using a stressor of longer duration. In lipopolysaccharide (LPS) stress studies, female CRH-BP-deficient mice showed elevated levels of stress-induced corticosterone release as compared to wild-type littermates. These studies demonstrate a role for the pituitary CRH-BP in attenuating the HPA response to stress in female mice.
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Affiliation(s)
- Gwen S Stinnett
- Molecular and Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, United States
| | - Nicole J Westphal
- Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI 48109, United States
| | - Audrey F Seasholtz
- Molecular and Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, United States; Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI 48109, United States; Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109, United States.
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19
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Adán N, Ledesma-Colunga MG, Reyes-López AL, Martínez de la Escalera G, Clapp C. Arthritis and prolactin: a phylogenetic viewpoint. Gen Comp Endocrinol 2014; 203:132-6. [PMID: 24508497 DOI: 10.1016/j.ygcen.2014.01.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 01/14/2014] [Accepted: 01/24/2014] [Indexed: 12/16/2022]
Abstract
Arthritic disorders are family of diseases that have existed since vertebrate life began. Their etiology is multifactorial with genetic, environmental, and gender factors driving chronic joint inflammation. Prolactin is a sexually dimorphic hormone in mammals that can act to both promote and ameliorate rheumatic diseases. It is found in all vertebrate groups where it exerts a wide diversity of actions. This review briefly addresses the presence and features of arthritic diseases in vertebrates, the effects of PRL on joint tissues and immune cells, and whether PRL actions could have contributed to the ubiquity of arthritis in nature. This comparative approach highlights the value of PRL as a biologically conserved factor influencing the development and progression of arthritis.
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Affiliation(s)
- Norma Adán
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM-Juriquilla, 76230 Querétaro, Mexico
| | - María G Ledesma-Colunga
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM-Juriquilla, 76230 Querétaro, Mexico
| | - Ana L Reyes-López
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM-Juriquilla, 76230 Querétaro, Mexico
| | | | - Carmen Clapp
- Instituto de Neurobiología, Universidad Nacional Autónoma de México (UNAM), Campus UNAM-Juriquilla, 76230 Querétaro, Mexico.
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20
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Price AK, Bridges RS. The effects of bromocriptine treatment during early pregnancy on postpartum maternal behaviors in rats. Dev Psychobiol 2014; 56:1431-7. [PMID: 24889499 DOI: 10.1002/dev.21224] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 05/05/2014] [Indexed: 11/10/2022]
Abstract
Prolactin, a hormone of the anterior pituitary, is involved in initiating maternal behavior, alleviating postpartum anxiety, and stimulating lactogenesis. Bromocriptine, a dopamine D2 receptor agonist, inhibits prolactin secretion. Bromocriptine administration represses postpartum maternal behaviors (pup retrieval) in mice, and causes elevated anxiety in the elevated plus maze [Larsen & Grattan (2010). Endocrinology 151(8): 3805-3814]. Whether similar effects exist in other species is unknown. The present study examined the possible involvement of prolactin during early gestation on maternal behavior and anxiety in rats. Bromocriptine given on days 2-4 of pregnancy resulted in impaired postpartum maternal behaviors in a novel environment during early lactation. However, compared to controls, bromocriptine-treated subjects did not exhibit increased postpartum anxiety in the elevated plus maze. These findings support work in mice that bromocriptine treatment during early gestation impedes postpartum maternal care, and indicate that early gestational hormonal status affects postpartum behavior more broadly in other mammals.
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Affiliation(s)
- Anya K Price
- Department of Biomedical Sciences, Cummings School of Veterinary Medicine at Tufts University, 200 Westboro Road, North Grafton, MA, 01536.
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21
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Valdez SR, Pennacchio GE, Gamboa DF, de Di Nasso EG, Bregonzio C, Soaje M. Opioid modulation of prolactin secretion induced by stress during late pregnancy. Role of ovarian steroids. Pharmacol Rep 2014; 66:386-93. [PMID: 24905513 DOI: 10.1016/j.pharep.2013.12.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 12/06/2013] [Accepted: 12/20/2013] [Indexed: 11/28/2022]
Abstract
BACKGROUND The opioid system modulates prolactin release during late pregnancy. Its role and the participation of ovarian hormones in this modulation are explored in ether stress-induced prolactin release. METHODS/RESULTS Estrous, 3-day and 19-day pregnant rats were used. We administered the antagonist mifepristone (Mp) and tamoxifen to evaluate progesterone and estradiol action in naloxone (NAL, opioid antagonist) or saline treated rats. Ether stress had no effect on serum prolactin levels in controls but increased prolactin release in NAL-treated rats. Prolactin response to stress in NAL-treated rats was blocked by l-DOPA administration. Mp treatment on day 18 of pregnancy increased prolactin levels after stress without alterations by NAL. Tamoxifen on days 14 and 15 of pregnancy completely blocked Mp and NAL effects on prolactin release at late pregnancy. In contrast, stress significantly increased prolactin levels in estrous rats and pretreatment with NAL prevented this. On day 3 of pregnancy, at 6.00 p.m., stress and NAL treatment inhibited prolactin levels in saline-treated rat. No effect of stress or NAL administration was detected on day 3 of pregnancy at 9.00 a.m. icv administration of specific opioids antagonist, B-Funaltrexamine but not Nor-Binaltorphimine or Naltrindole, caused a significant increase in stress-induced prolactin release. CONCLUSIONS Opioid system suppression of prolactin stress response during late pregnancy was observed only after progesterone withdrawal, involving a different opioid mechanism from its well-established stimulatory role. This mechanism acts through a mu opioid receptor and requires estrogen participation. The opioid system and progesterone may modulate stress-induced prolactin release, probably involving a putative prolactin-releasing factor.
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Affiliation(s)
- Susana R Valdez
- Laboratorio de Reproducción y Lactancia, IMBECU-CONICET, Mendoza, Argentina; Instituto de Ciencias Básicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | | | - Dante F Gamboa
- Laboratorio de Reproducción y Lactancia, IMBECU-CONICET, Mendoza, Argentina
| | | | - Claudia Bregonzio
- Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Argentina
| | - Marta Soaje
- Laboratorio de Reproducción y Lactancia, IMBECU-CONICET, Mendoza, Argentina; Departamento de Morfofisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina.
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22
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Adán N, Guzmán-Morales J, Ledesma-Colunga MG, Perales-Canales SI, Quintanar-Stéphano A, López-Barrera F, Méndez I, Moreno-Carranza B, Triebel J, Binart N, Martínez de la Escalera G, Thebault S, Clapp C. Prolactin promotes cartilage survival and attenuates inflammation in inflammatory arthritis. J Clin Invest 2013; 123:3902-13. [PMID: 23908112 DOI: 10.1172/jci69485] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Accepted: 06/06/2013] [Indexed: 02/05/2023] Open
Abstract
Chondrocytes are the only cells in cartilage, and their death by apoptosis contributes to cartilage loss in inflammatory joint diseases, such as rheumatoid arthritis (RA). A putative therapeutic intervention for RA is the inhibition of apoptosis-mediated cartilage degradation. The hormone prolactin (PRL) frequently increases in the circulation of patients with RA, but the role of hyperprolactinemia in disease activity is unclear. Here, we demonstrate that PRL inhibits the apoptosis of cultured chondrocytes in response to a mixture of proinflammatory cytokines (TNF-α, IL-1β, and IFN-γ) by preventing the induction of p53 and decreasing the BAX/BCL-2 ratio through a NO-independent, JAK2/STAT3-dependent pathway. Local treatment with PRL or increasing PRL circulating levels also prevented chondrocyte apoptosis evoked by injecting cytokines into the knee joints of rats, whereas the proapoptotic effect of cytokines was enhanced in PRL receptor-null (Prlr(-/-)) mice. Moreover, eliciting hyperprolactinemia in rats before or after inducing the adjuvant model of inflammatory arthritis reduced chondrocyte apoptosis, proinflammatory cytokine expression, pannus formation, bone erosion, joint swelling, and pain. These results reveal the protective effect of PRL against inflammation-induced chondrocyte apoptosis and the therapeutic potential of hyperprolactinemia to reduce permanent joint damage and inflammation in RA.
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Affiliation(s)
- Norma Adán
- Instituto de Neurobiología, Universidad Nacional Autónoma de México, Campus UNAM-Juriquilla, Querétaro, México
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Parra A, Ramírez-Peredo J, Reyes E, Hidalgo R, Macías-Gallardo J, Lutz-Presno J, Ruiz-Argüelles A, Garza E, Infante E, Gutiérrez-Aguirre CH, Salazar-Riojas R, Villarreal JZ, Gómez-Almaguer D, Ruiz-Argüelles GJ. Moderate hyperprolactinemia is associated with survival in patients with acute graft-versus-host disease after allogeneic stem cell transplantation. Hematology 2013; 17:85-92. [DOI: 10.1179/102453312x13221316477930] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Affiliation(s)
| | | | - Enrique Reyes
- Instituto Nacional de Perinatología, Mexico City, Mexico
| | - Rocío Hidalgo
- Instituto Nacional de Perinatología, Mexico City, Mexico
| | - Julio Macías-Gallardo
- Centro de Hematología y Medicina Interna de Puebla, Clínica Ruiz de Puebla, Puebla, Mexico
| | - Julia Lutz-Presno
- Centro de Hematología y Medicina Interna de Puebla, Clínica Ruiz de Puebla, Puebla, Mexico
| | | | - Eduardo Garza
- Laboratorios Clínicos de Puebla, Clínica Ruiz de Puebla, Puebla, Mexico
| | | | | | - Rosario Salazar-Riojas
- Hematology Department Hospital Universitario, Universidad Autónoma de Nuevo León, Monterrey, Mexico
| | - Jesús Z. Villarreal
- Hematology Department Hospital Universitario, Universidad Autónoma de Nuevo León, Monterrey, Mexico
| | - David Gómez-Almaguer
- Hematology Department Hospital Universitario, Universidad Autónoma de Nuevo León, Monterrey, Mexico
| | - Guillermo J. Ruiz-Argüelles
- Centro de Hematología y Medicina Interna de Puebla, Clínica Ruiz de Puebla, Puebla, Mexico
- Laboratorios Clínicos de Puebla, Clínica Ruiz de Puebla, Puebla, Mexico
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Andersson H, Rehm S, Stanislaus D, Wood CE. Scientific and Regulatory Policy Committee (SRPC) Paper. Toxicol Pathol 2013; 41:921-34. [DOI: 10.1177/0192623312466959] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Hormonally mediated effects on the female reproductive system may manifest as pathologic changes of endocrine-responsive organs and altered reproductive function. Identification of these effects requires proper assessment, which may include investigative studies to profile female reproductive hormones. Here, we briefly describe normal hormonal patterns across the estrous or menstrual cycle and provide general guidance on measuring female reproductive hormones and characterizing hormonal disturbances in nonclinical toxicity studies. Although species used in standard toxicity studies share basic features of reproductive endocrinology, there are important species differences that affect both study design and interpretation of results. Diagnosing female reproductive hormone disturbances can be complicated by many factors, including estrous/menstrual cyclicity, diurnal variation, and age- and stress-related factors. Thus, female reproductive hormonal measurements should not generally be included in first-tier toxicity studies of standard design with groups of unsynchronized intact female animals. Rather, appropriately designed and statistically powered investigative studies are recommended in order to properly identify ovarian and/or pituitary hormone changes and bridge these effects to mechanistic evaluations and safety assessments. This article is intended to provide general considerations and approaches for these types of targeted studies.
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Affiliation(s)
- Håkan Andersson
- Pathology Sciences, Global Safety Assessment, AstraZeneca R&D Innovative Medicines, Mölndal, Sweden
| | | | - Dinesh Stanislaus
- Reproductive Toxicology, Safety Assessment, GlaxoSmithKline, King of Prussia, Pennsylvania, USA
| | - Charles E. Wood
- National Health and Environmental Effects Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
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Valdez SR, Bonafede MM, Carreño NB, Deis RP, Jahn GA. Lactation deficit in OFA hr/hr rats may be caused by differential sensitivity to stress compared with Wistar and Sprague Dawley rats. Stress 2012; 15:361-77. [PMID: 22150285 DOI: 10.3109/10253890.2011.624223] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OFA hr/hr (OFA) rats present a major lactation deficit that impairs offspring survival. To explore whether abnormal stress responsiveness causes this deficit, we compared their hormonal (prolactin, progesterone, and corticosterone) responses to stress (room change and 2-min ether exposure) with those of Wistar and Sprague Dawley (SD) rats. We tested responses during the estrous cycle, pregnancy, lactation, after ovariectomy, and ovarian steroid hormone priming, and responses to suckling. We evaluated hypothalamic expression of receptors for prolactin (PRLRlong) and the isoforms of receptors for progesterone (PRA and B) and estrogen (ERα and β) in late pregnancy. We tested whether administration of an anxiolytic (diazepam) improved lactation. Ether exposure increased circulating levels of the three hormones in the three strains of rats, cycling and ovariectomized, but was less effective in pregnancy and lactation. Elevated estrogen level (estrus and estradiol-treated ovariectomized rats) potentiated the prolactin response more in SD and OFA rats than in Wistar rats. Elevated progesterone level (late pregnancy, lactation, progesterone-treated ovariectomized rats) inhibited the prolactin response less in OFA than in SD or Wistar rats. Ether exposure inhibited the prolactin and oxytocin responses to suckling only in OFA rats. Diazepam treatment increased pup survival rate and the prolactin response to suckling. Hypothalamic total PR mRNA content, assayed by RT-PCR, was higher in pregnant OFA rats compared with SD and Wistar rats, but the PRB/PRA protein ratio determined by Western blot was lowest in Wistar rats, intermediate in OFA rats, and highest in SD rats. The heightened sensitivity to stress of lactating OFA rats may contribute to their lactational deficit and be caused by a combination of hypoprolactinemia and reduced inhibitory capacity of progesterone.
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Affiliation(s)
- Susana R Valdez
- Laboratorio de Reproducción y Lactancia, IMBECU, CCT-CONICET Mendoza, Casilla de Correos 855, 5500 Mendoza, Argentina.
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Slow dissociation of partial agonists from the D₂ receptor is linked to reduced prolactin release. Int J Neuropsychopharmacol 2012; 15:645-56. [PMID: 21733233 DOI: 10.1017/s1461145711000824] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In this study we investigated the correlation between affinity, efficacy, peripheral receptor occupancy, and kinetic properties of D₂ dopamine receptor ligands with time-course evaluations of prolactin release in rat blood. We profiled typical and atypical antipsychotic antagonists at D₂ receptors, the partial agonist aripiprazole, and four novel partial agonist compounds with different properties. Clozapine and quetiapine revealed lower prolactin release and fast dissociation kinetics, linking fast dissociation and prolactin-sparing properties. Surprisingly, haloperidol, a highly prolactin-releasing antagonist, shared intermediate dissociation properties. Factors other than kinetic properties may thus contribute to prolactin-releasing properties of antagonists. Partial agonists sharing similar efficacies and receptor occupancies differed markedly in their ability to induce hyperprolactinaemia. Aripiprazole moderately released prolactin even at high receptor occupancies, with slow dissociation from D₂ receptors. Other compounds displaying low affinities and fast dissociations released prolactin substantially, although less than haloperidol. The effect augmented after repeated administrations. Compounds with high affinities and slow dissociation rates stimulated moderate prolactin release at high receptor occupancies, reaching a ceiling effect at 50-60% occupancy. Moreover, the effect developed tolerance. In conclusion, we investigated the affinity and kinetic properties of D₂ partial agonists associated with their ability to induce prolactin release in blood. We propose that for D₂ partial agonists, at comparable intrinsic activities and peripheral occupancies, the prolactin-releasing properties are linked to their kinetic rate properties. Differently from D₂ antagonists, partial agonists display slow dissociation and high affinity associated with a low prolactin release profile.
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Fernández-Mateos P, Jiménez-Ortega V, Cano Barquilla P, Cardinali DP, Esquifino AI. Discontinuous versus continuous drinking of ethanol in peripubertal rats: effect on 24-hour pattern of hypophyseal-gonadal axis activity and anterior pituitary oxidative stress. Neuroendocrinology 2012; 96:194-203. [PMID: 22286266 DOI: 10.1159/000334963] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Accepted: 11/09/2011] [Indexed: 12/24/2022]
Abstract
AIMS Discontinuous (weekend) consumption of alcohol is common in adolescents and young adults. This study therefore assesses, in peripubertal male rats, the effect of discontinuous as compared to chronic feeding of ethanol or control liquid diet. METHODS Animals received an ethanol liquid diet (6.2 % w/v) starting on day 35 of life. Every week for 5 weeks, the discontinuous ethanol group received the ethanol diet for 3 consecutive days and the control liquid diet for 4 days. At the 5th week, 24 h after the last ethanol administration to the discontinuously ethanol-treated animals, rats were killed at 4-hour intervals beginning at 09.00 h. Chronically administered rats received the ethanol diet until immediately before study. RESULTS Disrupted 24-hour rhythmicity together with a significant nocturnal increase in plasma luteinizing hormone (LH), testosterone and prolactin (PRL) occurred in the discontinuous ethanol group. Plasma ethanol levels were undetectable at 24 h after the last ethanol treatment. In contrast, after chronic ethanol administration, plasma PRL was increased late in scotophase while LH and testosterone decreased; blood ethanol levels were 2-fold greater than those in discontinuously ethanol-administered rats killed immediately after ethanol withdrawal. Circulating testosterone positively correlated with LH levels in control rats only. Chronic administration of ethanol significantly augmented mean expression of pituitary nitric oxide synthase (NOS)-2, heme oxygenase (HO)-1, Per1 and Per2 genes and disrupted their diurnal rhythmicity. Decreased NOS-1 and NOS-2 expression during scotophase, together with suppression of the rhythm in Per1 and Per2 expression, were found in the discontinuous ethanol group. CONCLUSIONS Abstinence after discontinuous drinking of alcohol in rats, as compared to chronic administration of ethanol, is accompanied by increases of plasma LH and testosterone, a greater PRL response and a less pronounced oxidative damage of the anterior pituitary.
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Affiliation(s)
- Pilar Fernández-Mateos
- Department of Biochemistry and Molecular Biology III, Universidad Complutense, Madrid, Spain
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Lennartsson AK, Jonsdottir IH. Prolactin in response to acute psychosocial stress in healthy men and women. Psychoneuroendocrinology 2011; 36:1530-9. [PMID: 21621331 DOI: 10.1016/j.psyneuen.2011.04.007] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Revised: 04/18/2011] [Accepted: 04/18/2011] [Indexed: 01/28/2023]
Abstract
BACKGROUND Serum levels of the anterior pituitary hormone prolactin have been reported to increase in response to different types of psychological stressors in humans. However, experimental laboratory stress studies investigating the acute response of prolactin to psychological stress show inconsistent results as increased, as well as decreased or unchanged levels of prolactin have been reported. OBJECTIVE The aim of this study was to investigate the effect of acute psychosocial stress on serum concentrations of prolactin in healthy men and women and possible sex differences. METHOD Thirty men and 15 women (age 30-50 years) underwent Trier Social Stress Test (TSST), a tool for investigating psychobiological stress responses in a laboratory setting. Blood samples were collected before and directly after the stress test and after 30 min of recovery. RESULTS We observed significantly elevated prolactin levels - along with significantly increased plasma adrenocorticotropic hormone (ACTH), serum cortisol, heart rate, systolic blood pressure (SBP), and diastolic blood pressure (DBP) - in response to the stressor. The prolactin response pattern did not differ between men and women, but there was some indication that women might have higher magnitude of response. Large individual differences regarding the magnitude of response were seen in general. The magnitude of the prolactin response was significantly related to the magnitude of the response of the hypothalamic-pituitary-adrenal (HPA) axis and, to some extent, the cardiovascular responses, indicating that individual differences in prolactin response in healthy men and women are dependent on the general physiological stress activation. In women, the magnitude of response was also related to estradiol level. CONCLUSION Prolactin does increase in response to psychosocial stress, however, with large individual variation in magnitude of response. The pattern of prolactin response does not differ between men and women. However, there was some indication that women might have higher magnitude of increase than men, and that the magnitude of response in women was dependent on estradiol levels, and this needs to be further studied.
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Parker VJ, Menzies JRW, Douglas AJ. Differential changes in the hypothalamic-pituitary-adrenal axis and prolactin responses to stress in early pregnant mice. J Neuroendocrinol 2011; 23:1066-78. [PMID: 21824206 DOI: 10.1111/j.1365-2826.2011.02204.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Stress can cause pregnancy failure but it is unclear how the mother's neuroendocrine system responds to stress to impair mechanisms establishing implantation. We analysed stress-evoked hypothalamic-pituitary-adrenal (HPA) axis responses in early pregnant mice. HPA axis secretory responses to immune stress in early-mid pregnancy were strong and similar to that in virgins, although activation of hypothalamic vasopressin neurones, rather than corticotrophin-releasing hormone neurones, may be more important in the stress response in pregnancy. The site and mode of detrimental glucocorticoid action in pregnancy is not established. Because circulating prolactin is important for progesterone secretion and pregnancy establishment, we also hypothesised that stress negatively impacts on prolactin and its neuroendocrine control systems in early pregnant mice. Basal prolactin secretion was profoundly inhibited by either immune or fasting stress in early pregnancy. Prolactin release is inhibited by tonic dopamine release from tuberoinfundibular (TIDA) neurones. However, immune stress did not increase TIDA neurone activity in the median eminence in pregnant mice [measured by 3,4-dihydroxyphenylacetic acid (DOPAC) content and the DOPAC:dopamine ratio]. By contrast, both immune stress and fasting caused weak induction of Fos in TIDA neurones. However, Fos induction does not always reflect dopamine secretion. Taken together, the data suggest that the stress-evoked profound reduction in prolactin secretion does not involve substantially increased dopamine activity as anticipated. In pregnancy, there was also attenuated recruitment of parvocellular paraventricular nucleus neurones and increased activation of brainstem noradrenergic nuclei after immune stress, indicating that other mechanisms may be involved in the suppression of prolactin secretion. In summary, low prolactin and increased circulating glucocorticoids together may partly explain how a mother's endocrine system mediates stress-induced pregnancy failure.
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Affiliation(s)
- V J Parker
- Centre for Integrative Physiology, University of Edinburgh, Edinburgh, UK
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Schmid B, Chastel O, Jenni L. The prolactin response to an acute stressor in relation to parental care and corticosterone in a short-lived bird, the Eurasian hoopoe. Gen Comp Endocrinol 2011; 174:22-9. [PMID: 21855546 DOI: 10.1016/j.ygcen.2011.07.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 07/19/2011] [Accepted: 07/27/2011] [Indexed: 11/26/2022]
Abstract
Prolactin plays an important role in mediating parental care in birds, but little is known about changes in prolactin levels when animals disrupt their reproductive behaviour during emergency life-history stages. We investigated the variation of prolactin levels with breeding stage, sex, body condition and as a response to a standardized acute stressor in a small short-lived bird, the Eurasian hoopoe Upupa epops under natural field conditions. We found higher baseline levels of prolactin in females during the brooding phase than in their mates which feed them and their chicks at this stage. Moreover, this is the first report of a differential prolactin stress-response between sexes with contrasting parental care within a breeding phase. Capture, handling and restraint induced a clear decrease of prolactin levels which was less pronounced in females at the very early stage of brooding compared to females in later stages. In contrast, the prolactin stress response in males remained nearly constant over the breeding stages and was stronger than in females. Baseline levels of prolactin, but not handling-induced levels, were positively correlated with body condition. We found a weak relationship between the decrease in prolactin due to acute handling stress and handling-induced levels of corticosterone. Taken together, both baseline and stress response levels of prolactin were related to the amount of parental care, although we found no relationship with reproductive success. It appears that the response to an acute stressor in prolactin levels is finely tuned to parental duties and investment. Hence, prolactin appears to be involved in mediating the trade-off between current reproduction versus self-maintenance and future reproduction.
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Affiliation(s)
- Baptiste Schmid
- Swiss Ornithological Institute, Seerose 1, CH-6204 Sempach, Switzerland.
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Traslaviña GAA, Franci CR. The CRH-R₁ receptor mediates luteinizing hormone, prolactin, corticosterone and progesterone secretion induced by restraint stress in estrogen-primed rats. Brain Res 2011; 1421:11-9. [PMID: 21959177 DOI: 10.1016/j.brainres.2011.09.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2011] [Revised: 08/28/2011] [Accepted: 09/02/2011] [Indexed: 11/19/2022]
Abstract
Acute stress has been shown to modify hypothalamus-pituitary-gonadal (HPG) axis activity. Corticotropin-releasing hormone (CRH), the principal regulator of the hypothalamus-pituitary-adrenal (HPA) axis, has been implicated as a mediator of stress-induced effects on the reproductive axis. The role of the specific CRH receptor subtypes in this response is not completely understood. In the current study, we investigated the role of the CRH-R(1) receptor on luteinizing hormone (LH), follicle-stimulating hormone (FSH), prolactin (PRL), progesterone (P) and corticosterone (CT) secretion in stress-induced responses under the influence of estrogen (E(2)). Estrogen-primed ovariectomized rats (estradiol cypionate, 10 μg sc) received an i.v. administration of antalarmin (0.1 or 1mg/kg), a selective CRH-R(1) antagonist, or vehicle before restraint stress for 40 min. Seven blood samples were collected from two experimental groups (one from 10:00 h to 14:00 h and the other from 10:00 h to 18:00 h). An increase of plasma LH induced by restraint acute-stress was followed by alteration of the secretion pattern in the estrogen-induced afternoon surge. In a similar manner, we observed a suppression of the afternoon surge in plasma FSH, a delay of E(2)-induced PRL secretion, and an increase in plasma P and CT. Antalarmin attenuated stress-induce LH increase, decreased CT and P secretion and blocked the stress effects on PRL secretion. These findings suggest that CRH-R(1) mediates, at least in part, the restraint stress effects on the HPA, PRL, and reproductive axes.
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Affiliation(s)
- Guillermo A Ariza Traslaviña
- Department of Physiology, School of Medicine of Ribeirão Preto, University of São Paulo, 14049-900 Ribeirão Preto, SP, Brazil
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López-Fontana CM, Maselli ME, G de Di Nasso FE, Telleria CM, Carón RW. Regulation of prolactin secretion during the estrus in rats: possible role of glucocorticoids. Reproduction 2011; 142:477-85. [DOI: 10.1530/rep-11-0100] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Mifepristone (MIF) administration to cycling rats at proestrus induces hypersecretion of prolactin (PRL) at the following estrus. We aimed to assess whether this effect is due to the antiprogesterone or antiglucocorticoid action of MIF and to help underscore the nature of the circulating hormone(s) regulating PRL secretion at estrus. Female cycling rats in proestrus were treated with vehicle; the progesterone (Pg) and glucocorticoid receptor antagonists, MIF (5 mg/kg) or ORG-33628 (5 mg/kg); the glucocorticoid agonist dexamethasone (DEX; 27 mg/kg)±MIF; or the inhibitor of steroid synthesis aminoglutethimide (AG; 150 mg/kg)±MIF. The animals' blood was sampled the same day at 1800 h and at 1800 h of the following day to assess for circulating PRL and Pg levels. To distinguish antiglucocorticoid from antiprogesterone effects of MIF, we administered a highly specific neutralizing antibody against Pg. None of the antagonists modified serum PRL values at proestrus but increased PRL levels at estrus. DEX decreased the secretion of PRL at proestrus, yet the effect was entirely blocked by MIF. Furthermore, DEX decreased PRL at estrus in a MIF-reversible manner, suggesting that adrenal corticoids during proestrous may regulate PRL secretion at estrus. AG increased PRL secretion at estrus, whereas its association with MIF produced an even higher response. PRL concentration at estrus was not modified by the antiprogesterone antibody, suggesting that the effect of MIF is a consequence of its antiglucocorticoid effect and not due to its antiprogesterone properties. In conclusion, PRL secretion in the afternoon of the estrus is most likely regulated by glucocorticoids through an inhibitory action.
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Continuous versus discontinuous drinking of an ethanol liquid diet in peripubertal rats: effect on 24-h variation of lymph node and splenic mitogenic responses and lymphocyte subset populations. Alcohol 2011; 45:183-92. [PMID: 20843641 DOI: 10.1016/j.alcohol.2010.08.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Revised: 08/08/2010] [Accepted: 08/09/2010] [Indexed: 11/22/2022]
Abstract
Excessive alcohol consumption continues to be a major public health problem, particularly in the adolescent and young adult populations. Generally, such a behavior tends to be confined to the weekends, to attain frequently binge drinking. This study in peripubertal male rats compares the effect of the discontinuous feeding of a liquid diet containing a moderate amount of ethanol (6.2% wt/vol) to that of continuous ethanol administration or a control diet, taking as end points the 24-h variations of plasma prolactin levels and mitogenic responses and lymphocyte subset populations in submaxillary lymph nodes and spleen. Animals received the ethanol liquid diet starting on day 35 of life, the diet being similar to that given to controls except for that maltose was isocalorically replaced by ethanol. Ethanol provided 36% of the total caloric content. Every week, the discontinuous ethanol group received the ethanol diet for 3 days and the control liquid diet for the remaining 4 days. After 4 weeks, rats were killed at six time intervals, beginning at 0900 h. A significant decrease of splenic cells' response to concanavalin A, and of lymph node and splenic cells' response to lipopolysaccharide was found in rats under the discontinuous ethanol regime, when compared with control- or ethanol-chronic rats. Under discontinuous ethanol feeding, mean values of lymph node and splenic CD8(+) and CD4(+)-CD8(+) cells decreased, whereas those of lymph node and splenic T cells, and splenic B cells, augmented. In rats chronically fed with ethanol, splenic mean levels of CD8(+) and CD4(+)-CD8(+) cells augmented. Both modalities of ethanol administration disrupted the 24 h variation in immune function seen in controls. Mean plasma prolactin levels increased by 3.6-fold and 8.5-fold in rats chronically or discontinuously fed with alcohol, respectively. The immune parameters examined in an additional group of rats fed regular chow and water ad libitum did not differ significantly from control liquid diet. The results support the view that the discontinuous drinking of a moderate amount of ethanol can be more harmful for the immune system than a continuous ethanol intake, presumably by inducing a greater stress as indicated by the augmented plasma prolactin levels observed.
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Kosowska B, Zdrojewicz Z. Relationship between inbreeding and sex-hormone concentration in rats under stress. I. The effect of various inbreeding levels on pituitary sex-hormone concentrations in two types of stress. J Anim Breed Genet 2011. [DOI: 10.1111/j.1439-0388.1996.tb00597.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Baby on board: do responses to stress in the maternal brain mediate adverse pregnancy outcome? Front Neuroendocrinol 2010; 31:359-76. [PMID: 20546772 DOI: 10.1016/j.yfrne.2010.05.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2010] [Revised: 05/17/2010] [Accepted: 05/18/2010] [Indexed: 02/02/2023]
Abstract
Stress and adverse environmental surroundings result in suboptimal conditions in a pregnant mother such that she may experience poor pregnancy outcome including complete pregnancy failure and preterm labor. Furthermore her developing baby is at risk of adverse programming, which confers susceptibility to long term ill health. While some mechanisms at the feto-maternal interface underlying these conditions are understood, the underlying cause for their adverse adaptation is often not clear. Progesterone plays a key role at many levels, including control of neuroendocrine responses to stress, procuring the required immune balance and controlling placental and decidual function, and lack of progesterone can explain many of the unwanted consequences of stress. How stress that is perceived by the mother inhibits progesterone secretion and action is beginning to be investigated. This overview of maternal neuroendocrine responses to stress throughout pregnancy analyses how they interact to compromise progesterone secretion and precipitate undesirable effects in mother and offspring.
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Heidinger BJ, Chastel O, Nisbet ICT, Ketterson ED. Mellowing with age: older parents are less responsive to a stressor in a long-lived seabird. Funct Ecol 2010. [DOI: 10.1111/j.1365-2435.2010.01733.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Genazzani AD, Chierchia E, Santagni S, Rattighieri E, Farinetti A, Lanzoni C. Hypothalamic amenorrhea: from diagnosis to therapeutical approach. ANNALES D'ENDOCRINOLOGIE 2010; 71:163-9. [PMID: 20362965 DOI: 10.1016/j.ando.2010.02.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2010] [Revised: 02/06/2010] [Accepted: 02/08/2010] [Indexed: 10/19/2022]
Abstract
Among secondary amenorrheas, hypothalamic amenorrhea (HA) is the one with no evidence of endocrine/systemic causal factors. HA is mainly related to various stressors affecting neuroendocrine control of the reproductive axis. In clinical practice, HA is mainly associated with metabolic, physical, or psychological stress. Stress is the adaptive response of our body through all its homeostatic systems, to external and/or internal stimuli that activate specific and nonspecific physiological pathways. HA occurs generally after severe stressed conditions/situations such as dieting, heavy training, or intense emotional events, all situations that can induce amenorrhea with or without body weight loss and HA is a secondary amenorrhea with a diagnosis of exclusion. In fact, the diagnosis is essentially based on a good anamnestic investigation. It has to be investigated using the clinical history of the patient: occurrence of menarche, menstrual cyclicity, time and modality of amenorrhea, and it has to be excluded any endocrine disease or any metabolic (i.e., diabetes) and systemic disorders. It is necessary to identify any stressed situation induced by loss, family or working problems, weight loss or eating disorders, or physical training or agonist activity. Peculiar, though not specific, endocrine investigations might be proposed but no absolute parameter can be proposed since HA is greatly dependent from individual response to stressors and/or the adaptive response to stress. This chapter aims to give insights into diagnosis and putative therapeutic strategies.
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Affiliation(s)
- A D Genazzani
- Department of Obstetrics and Gynecology, Gynecological Endocrinology Center, University of Modena and Reggio Emilia, Via del Pozzo 71, 41100 Modena, Italy.
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Parker VJ, Douglas AJ. Stress in early pregnancy: maternal neuro-endocrine-immune responses and effects. J Reprod Immunol 2010; 85:86-92. [PMID: 20079933 DOI: 10.1016/j.jri.2009.10.011] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Revised: 10/05/2009] [Accepted: 10/08/2009] [Indexed: 12/26/2022]
Abstract
Stress profoundly compromises reproduction, particularly when experienced in early gestation. One outcome is pregnancy failure: although glucocorticoids have adverse effects it is not clear what their role in pregnancy failure is. However, secretion of vital hormones such as progesterone and prolactin are reduced and this unbalances the delicate and important pregnancy-protective cytokine milieu. Complex interaction between glucocorticoids, progesterone/prolactin and the immune system evidently precipitate the loss, although early loss may confer reproductive advantage by preserving maternal energy stores and facilitating ongoing maternal care for other offspring. If pregnancy failure is not induced another, perhaps more profound, outcome of maternal stress is fetal programming. Much is known about the role of elevated glucocorticoids during late gestation in fetal programming, but in early gestation their role is less clear, though likely. Other key pregnancy hormones and immune factors also contribute to fetal programming. Undoubtedly integrated action of glucocorticoids, progesterone/prolactin and the immune system is crucial for optimal pregnancy outcome and is highly susceptible to environmental conditions.
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Affiliation(s)
- Victoria J Parker
- Centre for Integrative Physiology, University of Edinburgh, Edinburgh, UK
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Filippa V, Mohamed F. Morphological and Morphometric Changes of Pituitary Lactotrophs of Viscacha (Lagostomus maximus maximus) in Relation to Reproductive Cycle, Age, and Sex. Anat Rec (Hoboken) 2009; 293:150-61. [DOI: 10.1002/ar.21013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Palma BD, Hipolide DC, Tufik S. Effects on prolactin secretion and binding to dopaminergic receptors in sleep-deprived lupus-prone mice. Braz J Med Biol Res 2009; 42:299-304. [PMID: 19287910 DOI: 10.1590/s0100-879x2009000300012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2007] [Accepted: 01/26/2009] [Indexed: 11/22/2022] Open
Abstract
Sleep disturbances have far-reaching effects on the neuroendocrine and immune systems and may be linked to disease manifestation. Sleep deprivation can accelerate the onset of lupus in NZB/NZWF(1) mice, an animal model of severe systemic lupus erythematosus. High prolactin (PRL) concentrations are involved in the pathogenesis of systemic lupus erythematosus in human beings, as well as in NZB/NZWF(1) mice. We hypothesized that PRL could be involved in the earlier onset of the disease in sleep-deprived NZB/NZWF(1) mice. We also investigated its binding to dopaminergic receptors, since PRL secretion is mainly controlled by dopamine. Female NZB/NZWF(1) mice aged 9 weeks were deprived of sleep using the multiple platform method. Blood samples were taken for the determination of PRL concentrations and quantitative receptor autoradiography was used to map binding of the tritiated dopaminergic receptor ligands [3H]-SCH23390, [3H]-raclopride and [3H]-WIN35,428 to D(1) and D(2) dopaminergic receptors and dopamine transporter sites throughout the brain, respectively. Sleep deprivation induced a significant decrease in plasma PRL secretion (2.58 +/- 0.95 ng/mL) compared with the control group (25.25 +/- 9.18 ng/mL). The binding to D(1) and D(2) binding sites was not significantly affected by sleep deprivation; however, dopamine transporter binding was significantly increased in subdivisions of the caudate-putamen--posterior (16.52 +/- 0.5 vs 14.44 +/- 0.6), dorsolateral (18.84 +/- 0.7 vs 15.97 +/- 0.7) and ventrolateral (24.99 +/- 0.5 vs 22.54 +/- 0.7 microCi/g), in the sleep-deprived mice when compared to the control group. These results suggest that PRL is not the main mechanism involved in the earlier onset of the disease observed in sleep-deprived NZB/NZWF(1) mice and the reduction of PRL concentrations after sleep deprivation may be mediated by modifications in the dopamine transporter sites of the caudate-putamen.
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Affiliation(s)
- B D Palma
- Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
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Zimmermann US, Buchmann AF, Spring C, Uhr M, Holsboer F, Wittchen HU. Ethanol administration dampens the prolactin response to psychosocial stress exposure in sons of alcohol-dependent fathers. Psychoneuroendocrinology 2009; 34:996-1003. [PMID: 19243891 DOI: 10.1016/j.psyneuen.2009.01.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2008] [Revised: 12/16/2008] [Accepted: 01/27/2009] [Indexed: 10/21/2022]
Abstract
Genetic predisposition and exposure to alcohol and stress increase the risk for alcoholism, possibly by forming a threefold interaction. This is suggested by various aspects of alcohol-induced stress response dampening in offspring of alcoholics. We tested whether such an interaction is also revealed by prolactin secretion, which is predominantly controlled by hypothalamic dopamine. Plasma prolactin was measured during four experimental days in 26 young males with a paternal history of alcoholism (PHA) and in 22 family history negative (FHN) controls. A public speaking stress paradigm was applied on the first 2 days, and a non-stress acoustic startle experiment on the others. Before the tests, subjects drank alcohol (0.6 g/kg) or placebo in a randomized, double-blind crossover design. During placebo experiments, prolactin levels significantly increased after stress, but not after startle, and did not differ between risk groups. Alcohol administration significantly increased prolactin before stress and during startle in both groups, did not alter stress-induced prolactin stimulation in FHN, but significantly attenuated the prolactin stress response in PHA subjects. The alcohol effects on prolactin, cortisol, and adrenocorticotropin stress response were positively interrelated with each other. These data confirm that alcohol specifically dampens the stress response in PHA but not FHN subjects. Since prolactin responses to stress alone and alcohol alone were normal in PHA, we conclude that this genetic effect is not related to altered physiology of the hypothalamic dopaminergic system, but to risk-group specific alcohol effects on hierarchically higher brain areas controlling the stress response in general.
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Affiliation(s)
- Ulrich S Zimmermann
- Max-Planck-Institute of Psychiatry, Kraepelinstrasse 10, 80804 Munich, Germany.
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Westphal NJ, Evans RT, Seasholtz AF. Novel expression of type 1 corticotropin-releasing hormone receptor in multiple endocrine cell types in the murine anterior pituitary. Endocrinology 2009; 150:260-7. [PMID: 18787023 PMCID: PMC2630890 DOI: 10.1210/en.2008-0630] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The CRH family of ligands signals via two distinct receptors, CRH-R1 and CRH-R2. Previous studies localized CRH-R1 and CRH-R2 to a subset of anterior pituitary corticotropes and gonadotropes, respectively. However, numerous studies have indicated that stress and CRH activity can alter the secretion of multiple anterior pituitary hormones, suggesting a broader expression of the CRH receptors in pituitary. To examine this hypothesis, the in vivo expression of CRH-R1 and CRH-R2 mRNA was further characterized in adult mouse pituitary. Quantitative RT-PCR analysis demonstrated that CRH-R1 mRNA is greater than 100-fold more abundant than CRH-R2 mRNA in male and female mouse pituitaries. Dual in situ hybridization analysis identified cell-specific CRH-R1 expression in the anterior pituitary. At least half of the CRH-R1-positive cells expressed proopiomelanocortin-mRNA (50% in females; 70% in males). In females, a significant percentage of the cells expressing CRH-R1 also expressed transcript for prolactin (40%), LHbeta (10%), or TSH (3%), all novel sites of CRH-R1 expression. Similarly in males, a percentage of CRH-R1-positive cells expressed prolactin (12%), LHbeta (13%), and TSH (5%). RT-PCR studies with immortalized murine anterior pituitary cell lines showed CRH-R1 and/or CRH-R2 expression in corticotropes (AtT-20 cells), gonadotropes (alphaT3-1 and LbetaT2 cells), and thyrotropes (alphaTSH cells). Whereas CRH-R1 expression in corticotropes is well established, the presence of CRH-R1 mRNA in a subset of lactotropes, gonadotropes, and thyrotropes establishes these cell types as novel sites of murine CRH-R1 expression and highlights the pituitary as an important site of interaction between the hypothalamus-pituitary-adrenal and multiple endocrine axes.
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Affiliation(s)
- Nicole J Westphal
- Neuroscience Graduate Program, The University of Michigan, Ann Arbor, Michigan 48109-2200, USA
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The utilization of the climatic chamber to evaluate the influence of ambient conditions on endocrine, nervous and immune systems of rats. Folia Histochem Cytobiol 2008; 46:253-6. [PMID: 19056527 DOI: 10.2478/v10042-008-0047-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The adaptation of an organism to a change in environmental conditions is a complex and in some aspects a poorly understood physiological process. The activating influence of stress on the sympathetic nervous system, the hypothalamic - pituitary - adrenal axis and the suppression of TSH, LH, FSH release is well known. The interplay of communication between the endocrine and immune systems plays an essential role in modulating the response to stress related mediators. The basis of many contradictory and incoherent results of experiments is due to the various methodologies of creating changes in environmental conditions, the way of collecting blood samples which influence stress mediators, the case of assessing the influence of many factors on reproductive functions and the performance of experiments without synchronization with the reproductive cycle. The review will focus on the presentation of simple and repeatable methods of development of an adaptation stress to changed environmental conditions (temperature, oxygenation, humidity) and the technique of blood collection during hour-long estimation of interactions between the endocrine, nervous and immune systems. We would like to place emphasis on appropriate ways of performing experiments on female rats, with regards to the choice of a suitable phase of the reproductive cycle. Also on ways of anaesthesia and microsurgical techniques of vein catheterisation for repeated blood sampling. The performance of all phases of the experiment allow us to estimate only the influence of environmental conditions and eliminate interfering factors during the process of preparing animal for the experiment.
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Insana SP, Wilson JH. Social buffering in rats: prolactin attenuation of active interaction. Psychol Rep 2008; 103:77-87. [PMID: 18982939 DOI: 10.2466/pr0.103.1.77-87] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Stress may result when the present environment is interpreted as threatening, and stress is known to increase the prolactin-secretory response. In the present study, rats (N=83) were exposed to a conditioned-fear paradigm (environment paired with footshock), and on testing day, rats were exposed to the experimental chamber without shock while alone (Alone n=16), with an object (Object n=17), with a euthanized conspecific (Euthanized n=16), or with a social partner (Social n=19). The control group (Control n=15) was exposed to the experimental chamber but was never shocked. The Control group had significantly lower levels of prolactin than the Alone, Object, and Euthanized groups; however, the Control group's levels of prolactin were not significantly different than that of the Social group, which was significantly lower than that for the Alone group. Social interaction decreased fear independent of the distraction provided by a stimulus in the chamber. Active touch appeared to be crucial for social buffering to occur.
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Marques de Souza L, Franci CR. GABAergic mediation of stress-induced secretion of corticosterone and oxytocin, but not prolactin, by the hypothalamic paraventricular nucleus. Life Sci 2008; 83:686-92. [PMID: 18840449 DOI: 10.1016/j.lfs.2008.09.007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2007] [Revised: 08/17/2008] [Accepted: 09/13/2008] [Indexed: 10/21/2022]
Abstract
The hypothalamus-pituitary-adrenal axis (HPA) participates in mediating the response to stressful stimuli. Within the HPA, neurons in the medial parvocellular region of paraventricular nucleus (PVN) of the hypothalamus integrate excitatory and inhibitory signals triggering secretion of corticotropin-releasing hormone (CRH), the main secretagogue of adrenocorticotropic hormone (ACTH). Stressful situations alter CRH secretion as well as other hormones, including prolactin and oxytocin. Most inputs to the PVN are of local origin, half of which are GABAergic neurons, and both GABA-A and GABA-B receptors are present in the PVN. The objective of the present study was to investigate the role of GABA-A and GABA-B receptors in the PVN's control of stress-induced corticosterone, oxytocin and prolactin secretion. Rats were microinjected with saline or different doses (0.5, 5 and 50 pmol) of GABA-A (bicuculine) or GABA-B (phaclofen) antagonists in the PVN. Ten minutes later, they were subjected to a stressor (ether inhalation) and blood samples were collected 30 min before and 10, 30, 60, 90 and 120 min after the stressful stimulus to measure hormone levels by radioimmunoassay. Our results indicate that GABA acts in the PVN to inhibit stress-induced corticosterone secretion via both its receptor subtypes, especially GABA-B. In contrast, GABA in the PVN stimulates oxytocin secretion through GABA-B receptors and does not alter prolactin secretion.
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Affiliation(s)
- Leandro Marques de Souza
- Departamento de Fisiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirão Preto SP, Brazil
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Dexmedetomidine Attenuates the Hemodynamic and Neuroendocrinal Responses to Skull-pin Head-holder Application During Craniotomy. J Neurosurg Anesthesiol 2008; 20:174-9. [DOI: 10.1097/ana.0b013e318177e5eb] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Webster Marketon JI, Glaser R. Stress hormones and immune function. Cell Immunol 2008; 252:16-26. [PMID: 18279846 DOI: 10.1016/j.cellimm.2007.09.006] [Citation(s) in RCA: 345] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2007] [Accepted: 09/01/2007] [Indexed: 01/28/2023]
Abstract
Over the past 20 years we have demonstrated both in animal models and in human studies that stress increases neuroendocrine hormones, particularly glucocorticoids and catecholamines but to some extent also prolactin, growth hormone and nerve growth factor. We have also shown that stress, through the action of these stress hormones, has detrimental effects on immune function, including reduced NK cell activity, lymphocyte populations, lymphocyte proliferation, antibody production and reactivation of latent viral infections. Such effects on the immune system have severe consequences on health which include, but are not limited to, delayed wound healing, impaired responses to vaccination and development and progression of cancer. These data provide scientific evidence of the effects of stress on immune function and implications for health.
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Affiliation(s)
- Jeanette I Webster Marketon
- Institute for Behavioral Medicine Research, The Ohio State University Medical Center, Columbus, OH 43210, USA
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Jans LAW, Riedel WJ, Markus CR, Blokland A. Serotonergic vulnerability and depression: assumptions, experimental evidence and implications. Mol Psychiatry 2007; 12:522-43. [PMID: 17160067 DOI: 10.1038/sj.mp.4001920] [Citation(s) in RCA: 277] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In recent years, the term serotonergic vulnerability (SV) has been used in scientific literature, but so far it has not been explicitly defined. This review article attempts to elucidate the SV concept. SV can be defined as increased sensitivity to natural or experimental alterations of the serotonergic (5-HTergic) system. Several factors that may disrupt the 5-HTergic system and hence contribute to SV are discussed, including genetic factors, female gender, personality characteristics, several types of stress and drug use. It is explained that SV can be demonstrated by means of manipulations of the 5-HTergic system, such as 5-HT challenges or acute tryptophan depletion (ATD). Results of 5-HT challenge studies and ATD studies are discussed in terms of their implications for the concept of SV. A model is proposed in which a combination of various factors that may compromise 5-HT functioning in one person can result in depression or other 5-HT-related pathology. By manipulating 5-HT levels, in particular with ATD, vulnerable subjects may be identified before pathology initiates, providing the opportunity to take preventive action. Although it is not likely that this model applies to all cases of depression, or is able to identify all vulnerable subjects, the strength of the model is that it may enable identification of vulnerable subjects before the 5-HT related pathology occurs.
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Affiliation(s)
- L A W Jans
- Faculty of Psychology, Department of Neurocognition, Maastricht University, Maastricht, The Netherlands.
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Genazzani AD, Ricchieri F, Lanzoni C, Strucchi C, Jasonni VM. Diagnostic and therapeutic approach to hypothalamic amenorrhea. Ann N Y Acad Sci 2007; 1092:103-13. [PMID: 17308137 DOI: 10.1196/annals.1365.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Hypothalamic amenorrhea (HA) is a secondary amenorrhea with no evidence of endocrine/systemic causal factors, mainly related to various stressors affecting neuroendocrine control of the reproductive axis. In clinical practice, HA is mainly associated with metabolic, physical, or psychological stress. Stress is the adaptive response of our body through all its homeostatic systems, to external and/or internal stimuli that activate specific and nonspecific physiological pathways. HA occurs generally after severe stress conditions/situations such as dieting, heavy training, or intense emotional events, all situations that can induce amenorrhea with or without body weight loss and HA is a secondary amenorrhea with a diagnosis of exclusion. In fact, the diagnosis is essentially based on a good anamnestic investigation. It has to be investigated using the clinical history of the patient: occurrence of menarche, menstrual cyclicity, time and modality of amenorrhea, and it has to be exclude any endocrine disease or any metabolic (i.e., diabetes) and systemic disorders. It is necessary to identify any stress situation induced by loss, family or working problems, weight loss or eating disorders, or physical training or agonist activity. Peculiar, though not specific, endocrine investigations might be proposed but no absolute parameter can be proposed since HA is greatly dependent from individual response to stressors and/or the adaptive response to stress. This article tries to give insights into diagnosis and putative therapeutic strategies.
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Affiliation(s)
- Alessandro D Genazzani
- Department of Obstetrics and Gynicology, Gynicological Endocrinology Center, University of Modena and Reggio Emilia, Modena, Italy.
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