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Sattgast LH, Branscum AJ, Newman N, Gonzales SW, Benton ML, Baker EJ, Grant KA, Turner RT, Iwaniec UT. Ethanol alters the relationship between IGF-1 and bone turnover in male macaques. J Endocrinol 2022; 255:131-141. [PMID: 36194528 PMCID: PMC9651018 DOI: 10.1530/joe-22-0075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 10/04/2022] [Indexed: 11/16/2022]
Abstract
Insulin-like growth factor 1 (IGF-1) influences bone turnover. Transient decreases in IGF-I levels and/or bioavailability may contribute to the detrimental effects of alcohol on bone. The goals of this non-human primate study were to i) evaluate the 20-h response of bone turnover markers to ethanol consumption and ii) assess how ethanol consumption influences the relationship between IGF-1 and these markers. Osteocalcin (bone formation), carboxyterminal cross-linking telopeptide of type 1 collagen (CTX, bone resorption), IGF-1, and IGF binding protein 1 (IGFBP-1) were measured in plasma from male rhesus macaques (N = 10, 8.4 ± 0.3 years) obtained at 12:00, 16:00, and 06:00 h during two phases: pre-ethanol (alcohol-naïve) and ethanol access. During the ethanol access phase, monkeys consumed 1.5 g/kg/day ethanol (4% w/v) beginning at 10:00 h. Osteocalcin and CTX were lower, and the ratio of osteocalcin to CTX was higher at each time point during ethanol access compared to the pre-ethanol phase. Pre-ethanol marker levels did not vary across time points, but markers varied during ethanol access. IGF-1 levels, but not IGFBP-1 levels, varied during the pre-ethanol phase. In contrast, IGF-1 levels were stable during ethanol access but IGFBP-1 levels varied. There were positive relationships between IGF-1 and turnover markers during the pre-ethanol phase, but not during ethanol access. In conclusion, chronic ethanol consumption reduces levels of bone turnover markers and blocks the normal positive relationship between IGF-1 and turnover markers and alters the normal relationship between IGF-1 and IGFBP-1. These findings support the hypothesis that chronic alcohol consumption leads to growth hormone/IGF-1 resistance.
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Affiliation(s)
- Lara H. Sattgast
- Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, USA
| | - Adam J. Branscum
- Biostatistics Program, School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, USA
| | - Natali Newman
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, USA
| | - Steven W. Gonzales
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, USA
| | | | - Erich J. Baker
- Department of Computer Science, Baylor University, Waco, TX, USA
| | - Kathleen A. Grant
- Division of Neuroscience, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, USA
| | - Russell T. Turner
- Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, USA
| | - Urszula T. Iwaniec
- Skeletal Biology Laboratory, School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, USA
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Dees WL, Hiney JK, Srivastava VK. How alcohol affects insulin-like growth factor-1's influences on the onset of puberty: A critical review. Alcohol Clin Exp Res 2021; 45:2196-2206. [PMID: 34523716 PMCID: PMC8642280 DOI: 10.1111/acer.14711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 09/01/2021] [Accepted: 09/07/2021] [Indexed: 11/30/2022]
Abstract
Alcohol (ALC) is capable of delaying signs associated with pubertal development in laboratory animals, as well as in humans. The normal onset of puberty results from a timely increase in gonadotropin‐releasing hormone (GnRH) secretion, which is associated with a gradual decline in prepubertal inhibitory influences, and the establishment of excitatory inputs that increase GnRH release, which together drive pubertal development. In recent years, insulin‐like growth factor‐1 (IGF‐1) has emerged as a pivotal contributor to prepubertal GnRH secretion and pubertal development, whose critical actions are interfered with by ALC abuse. Here we review the neuroendocrine research demonstrating the important role that IGF‐1 plays in pubertal development, and describe the detrimental effects and mechanisms of action of ALC on the onset and progression of pubertal maturation.
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Affiliation(s)
- William L Dees
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas, USA
| | - Jill K Hiney
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas, USA
| | - Vinod K Srivastava
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas, USA
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3
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Addiction among women and sexual minority groups. HANDBOOK OF CLINICAL NEUROLOGY 2021. [PMID: 33008541 DOI: 10.1016/b978-0-444-64123-6.00028-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register]
Abstract
Gender-related alcohol and drug abuse problems are related not only to biologic differences but also to social and environment factors, all of which can influence the clinical presentation, consequences of use, and treatment approaches. The number of women becoming addicted to alcohol or drugs of abuse has significantly increased with women becoming the fastest-growing group of substance abusers in the United States. Given that women experience a more rapid progression of their addiction than men, it is important that we understand and address the differences to help develop prevention and treatment programs that are tailored for women, incorporating trauma assessment and management, comorbidities, financial independence, pregnancy, and child care.
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Dees WL, Hiney JK, Srivastava VK. IGF-1 Influences Gonadotropin-Releasing Hormone Regulation of Puberty. Neuroendocrinology 2021; 111:1151-1163. [PMID: 33406521 PMCID: PMC8257778 DOI: 10.1159/000514217] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 12/08/2020] [Indexed: 11/19/2022]
Abstract
The pubertal process is initiated as a result of complex neuroendocrine interactions within the preoptic and hypothalamic regions of the brain. These interactions ultimately result in a timely increase in the secretion of gonadotropin-releasing hormone (GnRH). Researchers for years have believed that this increase is due to a diminished inhibitory tone which has applied a prepubertal brake on GnRH secretion, as well as to the gradual development of excitatory inputs driving the increased release of the peptide. Over the years, insulin-like growth factor-1 (IGF-1) has emerged as a prime candidate for playing an important role in the onset of puberty. This review will first present initial research demonstrating that IGF-1 increases in circulation as puberty approaches, is able to induce the release of prepubertal GnRH, and can advance the timing of puberty. More recent findings depict an early action of IGF-1 to activate a pathway that releases the inhibitory brake on prepubertal GnRH secretion provided by dynorphin, as well as demonstrating that IGF-1 can also act later in the process to regulate the synthesis and release of kisspeptin, a potent stimulator of GnRH at puberty.
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Affiliation(s)
- William L Dees
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas, USA,
| | - Jill K Hiney
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas, USA
| | - Vinod K Srivastava
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas, USA
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5
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Sohel MMH, Salman MA, Ayvaz A. Cellular and Transcriptional Adaptation of Bovine Granulosa Cells Under Ethanol-Induced Stress In Vitro. Alcohol Alcohol 2020; 56:383-392. [PMID: 33150387 DOI: 10.1093/alcalc/agaa110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 09/16/2020] [Indexed: 11/14/2022] Open
Abstract
AIMS Granulosa cells (GCs) are the major cellular component in a follicular microenvironment and play an indispensable role in ovarian function. This study was conducted to investigate the effects of ethanol exposure on the cellular and transcriptional changes of ovarian GCs. METHODS For this purpose, bovine GCs were exposed to different concentrations of ethanol (0, 50, 100, 200, 500 and 1000) to mimic the effects of alcohol in in vitro. Subsequently, 100 and 1000 mM concentrations were discarded from further experiments, as 100 mM was not different from 50 mM, and 1000 mM was supertoxic to the cells. RESULTS The results showed that there was a gradual loss of cell viability with the increase of the ethanol concentration, i.e. lowest viability was observed at the highest concentration (1000 mM), which is further supported by cell proliferation assay. Mitochondrial activity decreased significantly at higher concentrations. The expression of NRF2 decreased significantly (P < 0.05) in ethanol-exposed cells compared with the cells in the control group at the 6-h time point, whereas the expression was increased in 500 mM concentration at the 24-h time point. The expression of antioxidant genes, downstream to Nrf2-pathway activation, showed that overall expression pattern similar to NRF2. CONCLUSION The result of this study prompted us to postulate that ethanol exposure decreases the ability of GCs to handle stress by downregulating the expression of genes involved in Nrf2-pathway.
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Affiliation(s)
- Md Mahmodul Hasan Sohel
- Department of Genetics, Faculty of Veterinary Medicine, Erciyes University, Kayseri 38039, Turkey.,Genome and Stem Cell Centre, Erciyes University, Kayseri 38039, Turkey
| | | | - Abdurrahman Ayvaz
- Department of Biology, Faculty of Science, Erciyes University, Kayseri 38039, Turkey
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de Angelis C, Nardone A, Garifalos F, Pivonello C, Sansone A, Conforti A, Di Dato C, Sirico F, Alviggi C, Isidori A, Colao A, Pivonello R. Smoke, alcohol and drug addiction and female fertility. Reprod Biol Endocrinol 2020; 18:21. [PMID: 32164734 PMCID: PMC7069005 DOI: 10.1186/s12958-020-0567-7] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 01/21/2020] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Considerable interest has been gathered on the relevant impact of preventable factors, including incorrect lifestyle and unhealthy habits, on female fertility. Smoking, alcohol and addictive drugs consumption represent a major concern, given the broad range of diseases which might be favored or exacerbated by these dependable attitudes. Despite the well-characterized effects of prenatal exposure on pregnancy outcomes and fetus health, a substantial proportion of women of reproductive age is still concerned with these habits. At present, the impact of smoke, alcohol and addictive drugs on women fertility, and, particularly, the specific targets and underlying mechanisms, are still poorly understood or debated, mainly due to the scarcity of well-designed studies, and to numerous biases. OBJECTIVE The current review will provide a comprehensive overview of clinical and experimental studies in humans and animals addressing the impact of smoke, alcohol and addictive drugs on female fertility, by also embracing effects on ovary, oviduct, and uterus, with particular reference to primary endpoints such as ovarian reserve, steroidogenesis, ovulation and menstrual cycle, oviduct function and uterus receptivity and implantation. A brief focus on polycystic ovary syndrome and endometriosis will be also included. METHODS A Pubmed literature search was performed with selected keywords; articles were individually retrieved by each author. No limitation was set for publication date. Articles in languages other than English were excluded. Additional articles were retrieved from references list of selected manuscripts. RESULTS AND CONCLUSIONS Currently, the most consistent evidences of a detrimental effect of smoke, alcohol and addictive drugs on specific domains of the female reproductive function are provided by experimental studies in animals. Overall, clinical studies suggest that smoking is associated to decreased fertility, although causal inference should be further demonstrated. Studies addressing the effect of alcohol consumption on female fertility provide conflicting results, although the majority reported lack of a correlation. Extremely scarce studies investigated the effects of addictive drugs on female fertility, and the specific actions of selected drugs have been difficult to address, due to multidrug consumption.
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Affiliation(s)
- Cristina de Angelis
- I.O.S. & COLEMAN Srl, Naples, Italy
- grid.4691.a0000 0001 0790 385XDipartimento di Medicina Clinica e Chirurgia, Università “Federico II” di Napoli, Via Sergio Pansini 5, 80131 Naples, Italy
- grid.4691.a0000 0001 0790 385XFERTISEXCARES Centro di Andrologia, Medicina della Riproduzione e della Sessualità Maschile e Femminile, Università “Federico II” di Napoli, Naples, Italy
- grid.4691.a0000 0001 0790 385XDipartimento di Sanità Pubblica, Università “Federico II” di Napoli, Naples, Italy
| | - Antonio Nardone
- grid.4691.a0000 0001 0790 385XDipartimento di Sanità Pubblica, Università “Federico II” di Napoli, Naples, Italy
| | - Francesco Garifalos
- grid.4691.a0000 0001 0790 385XDipartimento di Medicina Clinica e Chirurgia, Università “Federico II” di Napoli, Via Sergio Pansini 5, 80131 Naples, Italy
- grid.4691.a0000 0001 0790 385XFERTISEXCARES Centro di Andrologia, Medicina della Riproduzione e della Sessualità Maschile e Femminile, Università “Federico II” di Napoli, Naples, Italy
| | - Claudia Pivonello
- grid.4691.a0000 0001 0790 385XDipartimento di Medicina Clinica e Chirurgia, Università “Federico II” di Napoli, Via Sergio Pansini 5, 80131 Naples, Italy
| | - Andrea Sansone
- grid.7841.aDepartment of Experimental Medicine, Faculty of Medicine and Dentistry, University of Rome “Sapienza”, viale Regina Elena 324, 00162 Roma, Italy
| | - Alessandro Conforti
- grid.4691.a0000 0001 0790 385XDepartment of Neuroscience, Reproductive Medicine, Odontostomatology, University of Naples Federico II, Naples, Italy
| | - Carla Di Dato
- grid.7841.aDepartment of Experimental Medicine, Faculty of Medicine and Dentistry, University of Rome “Sapienza”, viale Regina Elena 324, 00162 Roma, Italy
| | - Felice Sirico
- grid.4691.a0000 0001 0790 385XDipartimento di Sanità Pubblica, Università “Federico II” di Napoli, Naples, Italy
| | - Carlo Alviggi
- grid.4691.a0000 0001 0790 385XDepartment of Neuroscience, Reproductive Medicine, Odontostomatology, University of Naples Federico II, Naples, Italy
| | - Andrea Isidori
- grid.7841.aDepartment of Experimental Medicine, Faculty of Medicine and Dentistry, University of Rome “Sapienza”, viale Regina Elena 324, 00162 Roma, Italy
| | - Annamaria Colao
- grid.4691.a0000 0001 0790 385XDipartimento di Medicina Clinica e Chirurgia, Università “Federico II” di Napoli, Via Sergio Pansini 5, 80131 Naples, Italy
- grid.4691.a0000 0001 0790 385XFERTISEXCARES Centro di Andrologia, Medicina della Riproduzione e della Sessualità Maschile e Femminile, Università “Federico II” di Napoli, Naples, Italy
- grid.4691.a0000 0001 0790 385XCattedra Unesco “Educazione alla salute e allo sviluppo sostenibile”, Università “Federico II” di Napoli, Naples, Italy
| | - Rosario Pivonello
- grid.4691.a0000 0001 0790 385XDipartimento di Medicina Clinica e Chirurgia, Università “Federico II” di Napoli, Via Sergio Pansini 5, 80131 Naples, Italy
- grid.4691.a0000 0001 0790 385XFERTISEXCARES Centro di Andrologia, Medicina della Riproduzione e della Sessualità Maschile e Femminile, Università “Federico II” di Napoli, Naples, Italy
- grid.4691.a0000 0001 0790 385XCattedra Unesco “Educazione alla salute e allo sviluppo sostenibile”, Università “Federico II” di Napoli, Naples, Italy
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7
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Dees WL, Hiney JK, Srivastava VK. Regulation of prepubertal dynorphin secretion in the medial basal hypothalamus of the female rat. J Neuroendocrinol 2019; 31:e12810. [PMID: 31715027 PMCID: PMC6916394 DOI: 10.1111/jne.12810] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 10/21/2019] [Accepted: 11/08/2019] [Indexed: 11/27/2022]
Abstract
The onset of puberty is the result of an increase in secretion of hypothalamic gonadotrophin-releasing hormone (GnRH). This action is a result of not only the development of stimulatory inputs to its release, but also the gradual decrease in inhibitory inputs that restrain release of the peptide prior to pubertal onset. Dynorphin (DYN) is one of the inhibitory inputs produced in the medial basal hypothalamus (MBH); however, little is known about what substance(s) control its prepubertal synthesis and release. Because neurokinin B (NKB) increases in the hypothalamus as puberty approaches, we considered it a candidate for such a role. An initial study investigated the acute effects of an NKB agonist, senktide, on the secretion of DYN from MBH tissues incubated in vitro. In other experiments, central injections of senktide were administered to animals for 4 days then MBHs were collected for assessment of DYN synthesis or for the in vitro secretion of both DYN and GnRH. Because insulin-like growth factor (IGF)-1 has been shown to play an important role at puberty, additional animals received central injections of this peptide for 4 days to assess NKB and DYN synthesis or the in vitro secretion of NKB. The results obtained show that senktide administration up-regulates the NKB receptor protein, at the same time as suppressing the DYN and its receptor. Senktide consistently suppressed DYN and elevated GnRH secretion in the same tissue incubates from both the acute and chronic studies. IGF-1 administration caused an increase in NKB protein, at the same time as decreasing DYN protein. Furthermore, the central administration of IGF-1 caused an increase in NKB release, an action blocked by the IGF-1 receptor blocker, JB-1. These results indicate that the IGF-1/NKB pathway contributes to suppressing the DYN inhibitory tone on prepubertal GnRH secretion and thus facilitates the puberty-related increase in the release of GnRH to accelerate the onset of puberty.
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Affiliation(s)
- William L. Dees
- Department of Veterinary Integrative BiosciencesCollege of Veterinary MedicineTexas A&M UniversityCollege StationTXUSA
| | - Jill K. Hiney
- Department of Veterinary Integrative BiosciencesCollege of Veterinary MedicineTexas A&M UniversityCollege StationTXUSA
| | - Vinod K. Srivastava
- Department of Veterinary Integrative BiosciencesCollege of Veterinary MedicineTexas A&M UniversityCollege StationTXUSA
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8
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Abstract
Gender-related alcohol and drug abuse problems are related not only to biological differences, but also to social and environmental factors, which can influence the clinical presentation, consequences of use, and treatment approaches. Women are becoming the fastest-growing population of substance abusers in the United States. Given that women experience a more rapid progression of their addiction than men, it is important that we understand and address the differences to help develop prevention and treatment programs that are tailored for women, incorporating trauma assessment and management, identification and intervention for medical and psychiatric comorbidities, financial independence, pregnancy, and child care.
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Affiliation(s)
- Nassima Ait-Daoud
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, PO Box 800623, Charlottesville, VA 22908, USA.
| | - Derek Blevins
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, PO Box 800623, Charlottesville, VA 22908, USA
| | - Surbhi Khanna
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, PO Box 800623, Charlottesville, VA 22908, USA
| | - Sana Sharma
- Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, PO Box 800623, Charlottesville, VA 22908, USA
| | - Christopher P Holstege
- Division of Medical Toxicology, Department of Emergency Medicine, University of Virginia, PO Box 800774, Charlottesville, VA 22908-0774, USA
| | - Pooja Amin
- Center for Leading Edge Addiction Research (CLEAR) Department of Psychiatry and Neurobehavioral Sciences, University of Virginia, 560 Ray C Hunt Drive, Charlottesville, VA 22903-2981, USA
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9
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Gianfrilli D, Ferlin A, Isidori AM, Garolla A, Maggi M, Pivonello R, Santi D, Sansone A, Balercia G, Granata ARM, Sinisi A, Lanfranco F, Pasqualetti P, Foresta C, Lenzi A. Risk behaviours and alcohol in adolescence are negatively associated with testicular volume: results from the Amico‐Andrologo survey. Andrology 2019; 7:769-777. [DOI: 10.1111/andr.12659] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 05/06/2019] [Accepted: 05/06/2019] [Indexed: 01/06/2023]
Affiliation(s)
- D. Gianfrilli
- Department of Experimental Medicine, Section of Medical Pathophysiology, Food Science and Endocrinology Sapienza University of Rome Rome Italy
| | - A. Ferlin
- Department of Clinical and Experimental Sciences Unit of Endocrinology and Metabolism University of Brescia Brescia Italy
| | - A. M. Isidori
- Department of Experimental Medicine, Section of Medical Pathophysiology, Food Science and Endocrinology Sapienza University of Rome Rome Italy
| | - A. Garolla
- Unit of Andrology and Reproductive Medicine Department of Medicine University of Padova Padova Italy
| | - M. Maggi
- Sexual Medicine and Andrology Dipartimento Scienze Biomediche Sperimentali e Cliniche ‘Mario Serio’ University of Florence Firenze Italy
| | - R. Pivonello
- Dipartimento di Medicina Clinica e Chirurgia, Sezione di Endocrinologia Università Federico II di Napoli Naples Italy
| | - D. Santi
- Department of Biomedical, Metabolic and Neural Sciences University of Modena and Reggio Emilia Modena Italy
| | - A. Sansone
- Department of Experimental Medicine, Section of Medical Pathophysiology, Food Science and Endocrinology Sapienza University of Rome Rome Italy
| | - G. Balercia
- Endocrinology, Department of Clinical and Molecular Sciences Polytechnic University of Marche Ancona Italy
| | - A. R. M. Granata
- Department of Biomedical, Metabolic and Neural Sciences University of Modena and Reggio Emilia Modena Italy
| | - A. Sinisi
- Andrology Unit Department of Medical, Surgical, Neurological, Metabolic and Aging Sciences University HospitalL. Vanvitelli University of Campania Naples Italy
| | - F. Lanfranco
- Andrology Unit Division of Endocrinology, Diabetology and Metabolism Department of Medical Sciences University of Turin Torino Italy
| | - P. Pasqualetti
- Service of Medical Statistics and Information Technology Fatebenefratelli Foundation for Health Research and Education Rome Italy
| | - C. Foresta
- Unit of Andrology and Reproductive Medicine Department of Medicine University of Padova Padova Italy
| | - A. Lenzi
- Department of Experimental Medicine, Section of Medical Pathophysiology, Food Science and Endocrinology Sapienza University of Rome Rome Italy
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Sliwowska JH, Ziarniak K, Dudek M, Matuszewska J, Tena-Sempere M. Dangerous liaisons for pubertal maturation: the impact of alcohol consumption and obesity on the timing of puberty†. Biol Reprod 2018; 100:25-40. [DOI: 10.1093/biolre/ioy168] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 07/25/2018] [Indexed: 12/13/2022] Open
Affiliation(s)
- Joanna H Sliwowska
- Laboratory of Neurobiology, Institute of Zoology, Poznan University of Life Sciences, Poznan, Poland
| | - Kamil Ziarniak
- Laboratory of Neurobiology, Institute of Zoology, Poznan University of Life Sciences, Poznan, Poland
| | - Monika Dudek
- Laboratory of Neurobiology, Institute of Zoology, Poznan University of Life Sciences, Poznan, Poland
| | - Julia Matuszewska
- Laboratory of Neurobiology, Institute of Zoology, Poznan University of Life Sciences, Poznan, Poland
| | - Manuel Tena-Sempere
- Department of Cell Biology, Physiology and Immunology, University of Cordoba, and Instituto Maimonides de Investigación Biomédica de Cordoba (IMIBIC), Cordoba, Spain
- CIBEROBN - Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Cordoba, Spain
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11
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Srivastava VK, Hiney JK, Dees WL. Alcohol Delays the Onset of Puberty in the Female Rat by Altering Key Hypothalamic Events. Alcohol Clin Exp Res 2018; 42:1166-1176. [PMID: 29689132 DOI: 10.1111/acer.13762] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 04/13/2018] [Indexed: 01/12/2023]
Abstract
BACKGROUND Because alcohol (ALC) delays signs of pubertal development, we assessed the time course of events associated with the synthesis of critical hypothalamic peptides that regulate secretion of luteinizing hormone-releasing hormone (LHRH), the peptide that drives the pubertal process. METHODS Immature female rats were administered either laboratory chow or BioServe isocaloric control or ALC-liquid diets from 27 through 33 days of age. On days 28, 29, 31, and 33, animals were killed by decapitation and tissue blocks containing the medial basal hypothalamus (MBH) and the rostral hypothalamic area (RHA) were isolated and stored frozen until assessed by Western blot analysis. RESULTS Synthesis of dynorphin (DYN), a prepubertal inhibitor of LHRH secretion, was increased (p < 0.05) in the MBH of ALC-treated animals by day 29. DYN was further elevated (p < 0.01) on day 33 and was associated with an increase (p < 0.01) in DYN receptor expression. ALC did not affect synthesis of neurokinin B (NKB), a prepubertal stimulator of LHRH; however, it did suppress (p < 0.05) NKB receptor expression in the MBH by day 31. The most potent stimulator of prepubertal LHRH secretion, kisspeptin (Kp), was also decreased (p < 0.05) in the MBH as early as day 29, with continued suppression (p < 0.01) through day 33. Similar timely suppressions of mammalian target of rapamycin (mTOR), an immediate upstream regulator of Kp, were also noted. These decreases in mTOR and Kp were consistent with ALC stimulating (p < 0.05) the p-AMP-activated protein kinase/Raptor inhibitory pathway to mTOR on day 29, then later suppressing (p < 0.001) an Akt-mediated induction pathway to mTOR by day 31. In the RHA, ALC affected the pathways regulating Kp in a manner similar to that described in the MBH; however, these effects were not noted until day 33. CONCLUSIONS ALC acts within the MBH as early as 29 days to induce inhibitor and repressor inputs to LHRH, while depressing stimulatory inputs to the peptide. Collectively, these events lead to delayed signs of pubertal development.
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Affiliation(s)
- Vinod K Srivastava
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - Jill K Hiney
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - William L Dees
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
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12
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Hiney JK, Srivastava VK, Vaden Anderson DN, Hartzoge NL, Dees WL. Regulation of Kisspeptin Synthesis and Release in the Preoptic/Anterior Hypothalamic Region of Prepubertal Female Rats: Actions of IGF-1 and Alcohol. Alcohol Clin Exp Res 2017; 42:61-68. [PMID: 29072778 DOI: 10.1111/acer.13539] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 10/18/2017] [Indexed: 12/01/2022]
Abstract
BACKGROUND Alcohol (ALC) causes suppressed secretion of prepubertal luteinizing hormone-releasing hormone (LHRH). Insulin-like growth factor-1 (IGF-1) and kisspeptin (Kp) are major regulators of LHRH and are critical for puberty. IGF-1 may be an upstream mediator of Kp in the preoptic area and rostral hypothalamic area (POA/RHA) of the rat brain, a region containing both Kp and LHRH neurons. We investigated the ability of IGF-1 to stimulate prepubertal Kp synthesis and release in POA/RHA, and the potential inhibitory effects of ALC. METHODS Immature female rats were administered either ALC (3 g/kg) or water via gastric gavage at 0730 hours. At 0900 hours, both groups were subdivided where half received either saline or IGF-1 into the brain third ventricle. A second dose of ALC (2 g/kg) or water was administered at 1130 hours. Rats were killed 6 hours after injection and POA/RHA region collected. RESULTS IGF-1 stimulated Kp, an action blocked by ALC. Upstream to Kp, IGF-1 receptor (IGF-1R) activation, as demonstrated by the increase in insulin receptor substrate 1, resulted in activation of Akt, tuberous sclerosis 2, ras homologue enriched in brain, and mammalian target of rapamycin (mTOR). ALC blocked the central action of IGF-1 to induce their respective phosphorylation. IGF-1 specificity and ALC specificity for the Akt-activated mTOR pathway were demonstrated by the absence of effects on PRAS40. Furthermore, IGF-1 stimulated Kp release from POA/RHA incubated in vitro. CONCLUSIONS IGF-1 stimulates prepubertal Kp synthesis and release following activation of a mTOR signaling pathway, and ALC blocks this pathway at the level of IGF-1R.
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Affiliation(s)
- Jill K Hiney
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - Vinod K Srivastava
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - Danielle N Vaden Anderson
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - Nicole L Hartzoge
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - William L Dees
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
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Abstract
Gender-related alcohol and drug abuse problems are related not only to biological differences, but also to social and environmental factors, which can influence the clinical presentation, consequences of use, and treatment approaches. Women are becoming the fastest-growing population of substance abusers in the United States. Given that women experience a more rapid progression of their addiction than men, it is important that we understand and address the differences to help develop prevention and treatment programs that are tailored for women, incorporating trauma assessment and management, identification and intervention for medical and psychiatric comorbidities, financial independence, pregnancy, and child care.
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Lima LF, Rocha RMP, Duarte ABG, Brito IR, Silva GM, Rodrigues GQ, Nunes-Pinheiro DCS, Sales AD, Moura AA, Wheeler MB, Rodrigues APR, Campello CC, Figueiredo JR. Unexpected effect of the vehicle (grain ethanol) of homeopathic FSH on the in vitro survival and development of isolated ovine preantral follicles. Microsc Res Tech 2017; 80:406-418. [PMID: 27921341 DOI: 10.1002/jemt.22810] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 09/20/2016] [Accepted: 11/08/2016] [Indexed: 12/25/2022]
Abstract
The aims of this study were to investigate the effects of medium replacement system (experiment I) and of FSH presentations (homeopathic - FSH 6cH and allopathic FSH - rFSH; experiment II) on the in vitro development, hormone production and gene expression of isolated ovine preantral follicles cultured for 6 days. In experiment I, secondary follicles were cultured in the α-MEM+ supplemented with FSH 6cH (0.05 fg/ml) or recombinant bovine FSH (100 ng/ml) without/with daily medium addition. The homeopathic FSH treatments with/without medium addition improved (p < .05) follicular development compared to rFSH100 treatment without addition. FSH 6cH with addition showed the highest (p < .05) estradiol production. To verify whether the effects of homeopathic FSH were not due to its vehicle, experiment II was performed. The α-MEM+ was supplemented or not with alcohol (0.2% grain ethanol, v/v), FSH 6cH or rFSH100 with daily medium addition. Surprisingly, we found that all treatments improved follicular development compared to the α-MEM+ (p < .05). Moreover, homeopathic FSH was similar to the other treatments including its vehicle. In conclusion, its vehicle (ethanol) causes the effect of homeopathic FSH on in vitro development of isolated ovine preantral follicles.
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Affiliation(s)
- Lartiza F Lima
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Rebeca M P Rocha
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Ana Beatriz G Duarte
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Ivina R Brito
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Gerlane M Silva
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Giovanna Q Rodrigues
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Diana C S Nunes-Pinheiro
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Antônia D Sales
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Arlindo A Moura
- Group of Research in Biology of Reproduction - Department of Animal Science, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Matthew B Wheeler
- Department of Animal Sciences, University of Illinois, Urbana-Champaign, Urbana, Illinois
| | - Ana Paula R Rodrigues
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - Cláudio C Campello
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
| | - José Ricardo Figueiredo
- Laboratory of Manipulation of Oocytes and Preantral Follicles Department of Faculty of Veterinary, State University of Ceara, Itaperi Campus, Fortaleza, CE, 60740-903, Brazil
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Manganese protects against the effects of alcohol on hypothalamic puberty-related hormones. Life Sci 2016; 148:106-11. [PMID: 26876914 DOI: 10.1016/j.lfs.2016.02.047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 02/09/2016] [Accepted: 02/10/2016] [Indexed: 11/20/2022]
Abstract
AIMS Since manganese (Mn) is capable of stimulating the hypothalamic-pituitary unit and advancing female puberty, we assessed the possibility that this element might overcome some of the detrimental effects of prepubertal alcohol (ALC) exposure on the hypothalamic control of pituitary function. MAIN METHODS Rats received either saline or Mn (10mg/kg) daily by gastric gavage from day 12 to day 31. After weaning, all rats were provided Lab Chow diet ad libitum until day 27 when they began receiving either the Bio Serv control or ALC diet regime. On day 31, the medial basal hypothalamus (MBH) was collected to assess luteinizing hormone-releasing hormone (LHRH) and cyclooxygenase 2 (COX2) protein levels. Release of prostaglandin-E2 (PGE2), LHRH and serum luteinizing hormone (LH) were also assessed. Other animals were not terminated on day 31, but remained in study to assess timing of puberty. KEY FINDINGS Short-term ALC exposure caused elevated hypothalamic LHRH content, suggesting an inhibition in peptide release, resulting in a decrease in LH. Both actions of ALC were reversed by Mn supplementation. COX2 synthesis, as well as PGE2 and LHRH release were suppressed by ALC exposure, but Mn supplementation caused an increase in COX2 synthesis and subsequent PGE2 and LHRH release in the presence of ALC. Mn supplementation also ameliorated the action of ALC to delay puberty. SIGNIFICANCE These results suggest that low level Mn supplementation acts to protect the hypothalamus from some of the detrimental effects of ALC on puberty-related hormones.
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Srivastava VK, Hiney JK, Stevener K, Dees WL. Differential Effects of Alcohol on Excitatory and Inhibitory Puberty-Related Peptides in the Basal Hypothalamus of the Female Rat. Alcohol Clin Exp Res 2015; 39:2386-93. [PMID: 26608747 DOI: 10.1111/acer.12905] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 09/13/2015] [Indexed: 11/29/2022]
Abstract
BACKGROUND An increase in development of excitatory inputs along with a decline in inhibitory inputs ultimately govern the timely increased secretion of hypothalamic luteinizing hormone-releasing hormone (LHRH) at the time of puberty. As chronic alcohol (ALC) exposure acts at the hypothalamic level to suppress LHRH secretion and delay puberty, we assessed its ability to differentially affect the expression of key puberty-related proteins. METHODS ALC was administered to female rats from days 27 to 33, at which time animals were killed and tissues collected for protein expression. In the medial basal hypothalamus (MBH), we assessed kisspeptin (Kp) 10, an excitatory peptide critical for prepubertal LHRH secretion, and Lin28b, a peptide with an inhibitory influence on puberty. As a direct mechanism of action of Lin28b was not known, we determined whether its central administration could induce dynorphin (DYN), a peptide that is inhibitory on LHRH secretion. Also, ALC's effect on DYN protein expression was assessed, as well as its effect on DYN release in vitro. RESULTS ALC markedly suppressed (p < 0.01) the expression of the excitatory Kp protein, while at the same time increased (p < 0.001) the expression of inhibitory Lin28b protein. Subsequently, we showed for the first time that the central administration of Lin28b stimulated (p < 0.01) the synthesis of DYN. Finally, ALC also induced (p < 0.01) the protein expression and stimulated (p < 0.01) the in vitro release of DYN from the MBH. CONCLUSIONS These results indicate that ALC can simultaneously and differentially alter both excitatory and inhibitory influences governing pubertal development, show for the first time a mechanism of action by which Lin28b exerts its prepubertal inhibitory tone, and further demonstrate the negative influences of ALC on the pubertal process.
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Affiliation(s)
- Vinod K Srivastava
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - Jill K Hiney
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - Kristyn Stevener
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
| | - William L Dees
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
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Dees W, Hiney J, Srivastava V. Alcohol alters hypothalamic glial-neuronal communications involved in the neuroendocrine control of puberty: In vivo and in vitro assessments. Alcohol 2015; 49:631-7. [PMID: 26362096 DOI: 10.1016/j.alcohol.2015.08.001] [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: 06/15/2015] [Revised: 08/06/2015] [Accepted: 08/07/2015] [Indexed: 10/23/2022]
Abstract
The onset of puberty is the result of the increased secretion of hypothalamic luteinizing hormone-releasing hormone (LHRH). The pubertal process can be altered by substances that can affect the prepubertal secretion of this peptide. Alcohol is one such substance known to diminish LHRH secretion and delay the initiation of puberty. The increased secretion of LHRH that normally occurs at the time of puberty is due to a decrease of inhibitory tone that prevails prior to the onset of puberty, as well as an enhanced development of excitatory inputs to the LHRH secretory system. Additionally, it has become increasingly clear that glial-neuronal communications are important for pubertal development because they play an integral role in facilitating the pubertal rise in LHRH secretion. Thus, in recent years attempts have been made to identify specific glial-derived components that contribute to the development of coordinated communication networks between glia and LHRH cell bodies, as well as their nerve terminals. Transforming growth factor-α and transforming growth factor-β1 are two such glial substances that have received attention in this regard. This review summarizes the use of multiple neuroendocrine research techniques employed to assess these glial-neuronal communication pathways involved in regulating prepubertal LHRH secretion and the effects that alcohol can have on their respective functions.
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Hiney JK, Srivastava VK, Volz CE, Dees WL. Alcohol alters insulin-like growth factor-1-induced transforming growth factor β1 synthesis in the medial basal hypothalamus of the prepubertal female rat. Alcohol Clin Exp Res 2014; 38:2572-8. [PMID: 25335926 PMCID: PMC4211981 DOI: 10.1111/acer.12534] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 07/25/2014] [Indexed: 12/13/2022]
Abstract
BACKGROUND Insulin-like growth factor-1 (IGF-1) and transforming growth factor β1 (TGFβ1) are produced in hypothalamic astrocytes and facilitate luteinizing hormone-releasing hormone (LHRH) secretion. IGF-1 stimulates release by acting directly on the LHRH nerve terminals and both peptides act indirectly through specific plastic changes on glial/tanycyte processes that further support LHRH secretion. Because the relationship between these growth factors in the hypothalamus is not known, we assessed the ability of IGF-1 to induce TGFβ1 synthesis and release and the actions of alcohol (ALC) on this mechanism prior to the onset of puberty. METHODS Hypothalamic astrocytes were exposed to medium only, medium plus IGF-1 (200 ng/ml), or medium plus IGF-1 with 50 mM ALC. After 18 hours, media were collected and assayed for TGFβ1. For the in vivo experiment, prepubertal female rats were administered either ALC (3 g/kg) or water via gastric gavage at 07:30 hours and at 11:30 hours. At 09:00 hours, saline or IGF-1 was administered into the third ventricle. Rats were killed at 15:00 hours and the medial basal hypothalamus (MBH) was collected for assessment of TGFβ1, IGF-1 receptor (IGF-1R), and Akt. RESULTS IGF-1 induced TGFβ1 release (p < 0.01) from hypothalamic astrocytes in culture, an action blocked by ALC. In vivo, IGF-1 administration caused an increase in TGFβ1 protein compared with controls (p < 0.05), an action blocked by ALC as well as a phosphatidylinositol 3 kinase/Akt inhibitor. IGF-1 stimulation also increased both total (p< 0.01) and phosphorylated (p)-IGF-1R (p < 0.05) protein levels, and phosphorylated (p)-Akt levels (p < 0.01), which were also blocked by ALC. CONCLUSIONS This study shows that ALC blocks IGF-1 actions to stimulate synthesis and release of hypothalamic TGFβ1, total and p-IGF-1R, and p-Akt levels further demonstrating the inhibitory actions of ALC on puberty-related events associated with hypothalamic LHRH release.
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Affiliation(s)
- Jill K Hiney
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, Texas
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Srivastava VK, Hiney JK, Dees WL. Actions and interactions of alcohol and transforming growth factor β1 on prepubertal hypothalamic gonadotropin-releasing hormone. Alcohol Clin Exp Res 2014; 38:1321-9. [PMID: 24588206 DOI: 10.1111/acer.12374] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Accepted: 01/06/2014] [Indexed: 01/06/2023]
Abstract
BACKGROUND Alcohol (ALC) diminishes gonadotropin-releasing hormone (GnRH) secretion and delays puberty. Glial transforming growth factor β1 (TGFβ1) plays a role in glial-neuronal communications facilitating prepubertal GnRH secretion. We assessed the effects of acute ALC administration on TGFβ1-induced GnRH gene expression in the brain preoptic area (POA) and release of the peptide from the medial basal hypothalamus (MBH). Furthermore, we assessed actions and interactions of TGFβ1 and ALC on an adhesion/signaling gene family involved in glial-neuronal communications. METHODS Prepubertal female rats were administered ALC or water via gastric gavage at 7:30 am. At 9:00 am, saline or TGFβ1 (100 ng/3 μl) was administered into the third ventricle. At 3:00 pm, the POA was removed and frozen for gene expression analysis and repeated for protein assessments. In another experiment, the MBH was removed from ALC-free rats. After equilibration, tissues were incubated in Locke's medium only or medium containing TGFβ1 with or without 50 mM ALC for measurement of GnRH peptide released in vitro. RESULTS TGFβ1 induced GnRH gene expression in the POA, and this effect was blocked by ALC. We also described the presence and responsiveness of the TGFβ1 receptor in the POA and showed that acute ALC exposure not only altered the TGFβ1-induced increase in TGFβ-R1 protein expression but also the activation of receptor-associated proteins, Smad2 and Smad3, key downstream components of the TGFβ1 signaling pathway. Assessment of an adhesion/signaling family consisting of glial receptor protein tyrosine phosphatase beta and neuronal contactin-associated protein-1 (Caspr1) and contactin showed that the neuronal components were induced by TGFβ1 and that ALC blocked these effects. Finally, TGFβ1 was shown to induce release of the GnRH peptide in vitro, an action that was blocked by ALC. CONCLUSIONS We have demonstrated glial-derived TGFβ1 induces GnRH gene expression in the POA and stimulates release of the peptide from the MBH, actions necessary for driving the pubertal process. Importantly, ALC acted at both brain regions to block stimulatory effects of TGFβ1. Furthermore, ALC altered neuronal components of an adhesion/signaling family previously shown to be expressed on GnRH neurons and implicated in glial-GnRH neuronal communications. These results further demonstrate detrimental effects of ALC at puberty.
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Affiliation(s)
- Vinod K Srivastava
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas
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Lyngsø J, Toft G, Høyer B, Guldbrandsen K, Olsen J, Ramlau-Hansen C. Moderate alcohol intake and menstrual cycle characteristics. Hum Reprod 2013; 29:351-8. [DOI: 10.1093/humrep/det417] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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Abstract
Chronic consumption of a large amount of alcohol disrupts the communication between nervous, endocrine, and immune system and causes hormonal disturbances that lead to profound and serious consequences at physiologic and behavioral levels. These alcohol-induced hormonal dysregulations affect the entire body and can result in various disorders such as stress abnormalities, reproductive deficits, body growth defect, thyroid problems, immune dysfunction, cancers, bone disease, and psychological and behavioral disorders. This review summarizes the findings from human and animal studies that provide consistent evidence on the various effects of alcohol abuse on the endocrine system.
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Affiliation(s)
- Nadia Rachdaoui
- Nadia Rachdaoui, Ph.D., Rutgers Endocrine Research Program. Department of Animal Sciences Rutgers University, 67 Poultry Farm Lane, New Brunswick, NJ 08901,
| | - Dipak K. Sarkar
- Dipak K. Sarkar, Ph.D., D. Phil., Rutgers Endocrine Research Program. Department of Animal Sciences, Rutgers University, 67 Poultry Farm Lane, New Brunswick, NJ 08901,
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Hypothalamic glial-to-neuronal signaling during puberty: influence of alcohol. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2011; 8:2876-94. [PMID: 21845163 PMCID: PMC3155334 DOI: 10.3390/ijerph8072894] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Revised: 06/27/2011] [Accepted: 07/12/2011] [Indexed: 01/06/2023]
Abstract
Mammalian puberty requires complex interactions between glial and neuronal regulatory systems within the hypothalamus that results in the timely increase in the secretion of luteinizing hormone releasing hormone (LHRH). Assessing the molecules required for the development of coordinated communication networks between glia and LHRH neuron terminals in the basal hypothalamus, as well as identifying substances capable of affecting cell-cell communication are important. One such pathway involves growth factors of the epidermal growth factor (EGF) family that bind to specific erbB receptors. Activation of this receptor results in the release of prostaglandin-E2 (PGE2) from adjacent glial cells, which then acts on the nearby LHRH nerve terminals to elicit release of the peptide. Another pathway involves novel genes which synthesize adhesion/signaling proteins responsible for the structural integrity of bi-directional glial-neuronal communication. In this review, we will discuss the influence of these glial-neuronal communication pathways on the prepubertal LHRH secretory system, and furthermore, discuss the actions and interactions of alcohol on these two signaling processes.
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Srivastava VK, Hiney JK, Dees WL. Hypothalamic actions and interactions of alcohol and IGF-1 on the expression of glial receptor protein tyrosine phosphatase-β during female pubertal development. Alcohol Clin Exp Res 2011; 35:1812-21. [PMID: 21595703 DOI: 10.1111/j.1530-0277.2011.01525.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND Hypothalamic glial-neuronal communications are important for the activation of luteinizing hormone releasing hormone (LHRH) secretion at the time of puberty. As we have shown that alcohol (ALC) diminishes prepubertal LHRH secretion and delays puberty, we first assessed the effects of short-term ALC administration on the basal expression of a specific gene family involved in glial-neuronal communications. Second, as insulin-like growth factor-1 (IGF-1) is a critical regulator of LHRH secretion and the pubertal process, we then assessed whether IGF-1 could induce the expression of these signaling genes and determine whether ALC can block this affect. METHODS Immature female rats were fed a liquid diet containing ALC for 6 days beginning when 27 days old. Control animals received either the companion isocaloric liquid diet or rat chow and water. Animals were decapitated on day 33, in the late juvenile stage of development. Medial basal hypothalamic (MBH) tissues were obtained for gene and protein analyses of glial receptor protein tyrosine phosphatase-β (RPTPβ) and the 2 neuronal components, contactin and contactin-associated protein 1 (Caspr1). In the second experiment, IGF-1 was administered into the third ventricle (3V) and the MBH removed 6 hours after peptide delivery, and the above-mentioned 3 genes were analyzed by real-time PCR. To determine whether this action was affected by ALC, immature female rats were administered either ALC (3 g/kg) or water via gastric gavage at 0900 hours. At 1030 hours, the ALC and control groups were subdivided such that half of the animals were injected into the 3V with IGF-1 and the other half with an equal volume of saline. Rats were killed 6 hours after the IGF-1 injection and MBHs collected. RESULTS Real-time PCR showed that when compared with control animals, ALC caused a marked decrease (p < 0.001) in the basal expression of the RPTPβ gene, but did not affect the expression of either contactin or Caspr1. Likewise, analysis by Western blotting demonstrated that ALC caused suppressed (p < 0.001) levels of the RPTPβ protein, with the expressions of both contactin and Caspr1 proteins being unaltered. In the second experiment, results showed that only the RPTPβ gene was stimulated (p < 0.05) by IGF-1 in the MBH 6 hours after peptide delivery. Assessments revealed that the IGF-1 induced increase (p < 0.01) in the expression of the RPTPβ gene was blocked by the presence of ALC. CONCLUSIONS Prepubertal ALC exposure is capable of interfering with hypothalamic glial-neuronal communications by suppressing the synthesis of the glial product, RPTPβ, which is required for binding to the contactin-Caspr1 complex on LHRH neuronal terminals, thus suggesting that this action of ALC contributes to its detrimental effects on the pubertal process.
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Affiliation(s)
- Vinod K Srivastava
- Department of Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843-4458, USA
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Srivastava VK, Hiney JK, Dees WL. Prepubertal ethanol exposure alters hypothalamic transforming growth factor-α and erbB1 receptor signaling in the female rat. Alcohol 2011; 45:173-81. [PMID: 20926228 DOI: 10.1016/j.alcohol.2010.08.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 07/22/2010] [Accepted: 08/18/2010] [Indexed: 10/19/2022]
Abstract
Glial-derived transforming growth factor alpha (TGFα) activates the erbB1/erbB2 receptor complex on adjacent glial cells in the medial basal hypothalamus (MBH). This receptor activation stimulates the synthesis and release of prostaglandin-E(2) (PGE(2)) from the glial cells, which then induces the release of prepubertal luteinizing hormone-releasing hormone (LHRH) secretion from nearby nerve terminals; thus, showing the importance of glial-neuronal communications at the time of puberty. Ethanol (EtOH) is known to cause depressed prepubertal LHRH secretion and delayed pubertal development. In this study, we assessed whether short-term EtOH exposure could alter the hypothalamic glial to glial signaling components involved in prepubertal PGE(2) secretion. Immature female rats began receiving control or EtOH diets beginning when 27 days old. The animals were killed by decapitation after 4 and 6 days of treatment and confirmed to be in the late juvenile stage of development. Blood and brain tissues were collected for gene, protein, and hormonal assessments. Real-time polymerase chain reaction (PCR) analysis demonstrated that EtOH did not affect basal levels of erbB1 gene expression in the MBH. Expression of total erbB1 protein was also unaffected; however, the EtOH caused suppressed phosphorylation of erbB1 protein in the MBH at both 4 and 6 days (P<.01) as revealed by Western blotting. Phosphorylation and total protein levels of erbB2 receptor were not affected by EtOH exposure. Because this receptor is critical for PGE(2) synthesis/release, which mediates the secretion of LHRH, we assessed whether in vivo EtOH exposure could affect the release of PGE(2). EtOH exposure for 6 days suppressed (P<.01) basal levels of PGE(2) released into the medium. The effects of 4- and 6-day EtOH exposure on gene and protein expressions of TGFα, an upstream component in the activation of erbB1/erbB2, were also studied. The levels of TGFα mRNA were increased markedly at 4 days (P<.001), but declined to near basal levels by 6 days in the EtOH-treated animals. The EtOH caused increases in TGFα protein expression at both 4 (P<.001) and 6 (P<.01) days; hence, suggesting that the EtOH inhibited release of the peptide. We confirmed this inhibition by showing decreased (P<.01) TGFα released from MBHs incubated in vitro following 6 days of EtOH exposure in vivo. Thus, these results demonstrate that EtOH is capable of interfering with hypothalamic glial to glial signaling processes involved in prepubertal PGE(2) secretion.
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Peck JD, Peck BM, Skaggs VJ, Fukushima M, Kaplan HB. Socio-environmental factors associated with pubertal development in female adolescents: the role of prepubertal tobacco and alcohol use. J Adolesc Health 2011; 48:241-6. [PMID: 21338894 PMCID: PMC3058786 DOI: 10.1016/j.jadohealth.2010.06.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 06/29/2010] [Accepted: 06/30/2010] [Indexed: 11/27/2022]
Abstract
PURPOSE Alcohol administered to laboratory animals has been shown to suppress puberty-related hormones and delay puberty by interfering with ovarian development and function. The effects of early substance use on human pubertal development are relatively unexplored. METHODS This cross-sectional study of 3,106 female adolescents, aged 11-21 years, evaluated the association between prepubertal alcohol and tobacco use and the onset of puberty. Ages at initial breast development, body hair growth, and menarche were self-reported. Prepubertal alcohol and tobacco use were defined as the age at first use before the age of pubertal development and accompanied by regular use. Hazard ratios (HR) and 95% confidence intervals (CI) were calculated using Cox proportional hazard models. Logistic regression was used to estimate the association between substance use and delayed puberty, defined as lack of breast development by the age of 13 years. RESULTS Unadjusted models indicated prepubertal tobacco use was associated with a longer time required for breast development (HR = 0.74; 95% CI, 0.65-0.85) and body hair growth (HR = 0.81; 95% CI, 0.71-0.93). Prepubertal alcohol use was associated with late breast development (HR = 0.71; 95% CI, 0.57-0.88). The direction of the observed associations remained consistent after adjusting for covariates, but the magnitude of effects were attenuated and the upper bound of the 95% CIs exceeded the null value. Girls who used alcohol before puberty had four times the odds of having delayed puberty (OR = 3.99; 95% CI, 1.94-8.21) as compared with nonusers. CONCLUSION The results of this study suggest that the endocrine-disrupting effects of alcohol and tobacco use may alter the timing of pubertal development. These cross-sectional findings warrant further investigation.
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Affiliation(s)
- Jennifer David Peck
- University of Oklahoma Health Sciences Center, Department of Biostatistics and Epidemiology, Oklahoma City, OK 73104
| | - B. Mitchell Peck
- University of Oklahoma, Department of Sociology, Norman, OK 73072
| | - Valerie J. Skaggs
- University of Oklahoma Health Sciences Center, Department of Biostatistics and Epidemiology, Oklahoma City, OK 73104
| | - Miyuki Fukushima
- Cleveland State University, Department of Sociology and Criminology, Cleveland, OH 44115
| | - Howard B. Kaplan
- Texas A&M University, Department of Sociology, College Station, TX 77845
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Park JK, Hong IH, Ki MR, Chung HY, Ishigami A, Ji AR, Goo MJ, Kim DH, Kwak JH, Min CW, Lee SS, Jeong KS. Vitamin C deficiency increases the binucleation of hepatocytes in SMP30 knock-out mice. J Gastroenterol Hepatol 2010; 25:1769-76. [PMID: 21039840 DOI: 10.1111/j.1440-1746.2010.06239.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIMS The binucleation of hepatocytes, which was known as an important feature of liver growth and physiology, has been reported to be increased during the chronic oxidative injury stage and has been regarded as an age-related change of hepatic structures. Therefore, we investigated the binuclearity pattern in the livers of senescence marker proteins-30 (SMP30) knock-out (KO) mice compared with wild-type (WT) mice and vitamin C-treated KO (KO + VC) mice. METHODS The WT, KO and KO + VC mice were fed a vitamin C free diet and VC(+) group mice were given vitamin C water containing 1.5 g/L of vitamin C, whereas VC(-) group was given normal drinking water without vitamin C, for 16 weeks. RESULTS In microscopic examination, the livers of KO mice showed a significantly increased number of binuclear hepatocytes compared with that of WT mice and KO + VC mice. KO mice also showed the most increased expression level of CYP2E1 and PCNA determined by immunohistochemistry and immunoblot analysis. Moreover, KO mice indicated the highest level of serum alanine aminotransferase and aspartate aminotransferase level in serum biochemical analysis. Accordingly, significantly decreased levels of reactive oxygen species, MDA (malondialdehyde) and HAE (4-hydroxyalkenals) were detected in KO + VC mice compared with KO mice. CONCLUSION Therefore, it is concluded that vitamin C deficiency induces an increase of CYP2E1 expression and elevated ROS production, which causes oxidative liver injury and the elevation of hepatocyte binucleation in SMP30 KO mice.
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Affiliation(s)
- Jin-Kyu Park
- Department of Pathology, College of Veterinary Medicine, Kyungpook National University, Daegu, Republic of Korea
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Hopf FW, Bowers MS, Chang SJ, Chen BT, Martin M, Seif T, Cho SL, Tye K, Bonci A. Reduced nucleus accumbens SK channel activity enhances alcohol seeking during abstinence. Neuron 2010; 65:682-94. [PMID: 20223203 DOI: 10.1016/j.neuron.2010.02.015] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/04/2010] [Indexed: 10/19/2022]
Abstract
The cellular mechanisms underlying pathological alcohol seeking remain poorly understood. Here, we show an enhancement of nucleus accumbens (NAcb) core action potential firing ex vivo after protracted abstinence from alcohol but not sucrose self-administration. Increased firing is associated with reduced small-conductance calcium-activated potassium channel (SK) currents and decreased SK3 but not SK2 subunit protein expression. Furthermore, SK activation ex vivo produces greater firing suppression in NAcb core neurons from alcohol- versus sucrose-abstinent rats. Accordingly, SK activation in the NAcb core significantly reduces alcohol but not sucrose seeking after abstinence. In contrast, NAcb shell and lateral dorsal striatal firing ex vivo are not altered after abstinence from alcohol, and SK activation in these regions has little effect on alcohol seeking. Thus, decreased NAcb core SK currents and increased excitability represents a critical mechanism that facilitates motivation to seek alcohol after abstinence.
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Affiliation(s)
- F Woodward Hopf
- Ernest Gallo Clinic and Research Center, University of California, San Francisco, San Francisco, CA 94608, USA.
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Hiney JK, Srivastava VK, Les Dees W. Insulin-like growth factor-1 stimulation of hypothalamic KiSS-1 gene expression is mediated by Akt: effect of alcohol. Neuroscience 2009; 166:625-32. [PMID: 20034543 DOI: 10.1016/j.neuroscience.2009.12.030] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Revised: 12/01/2009] [Accepted: 12/10/2009] [Indexed: 02/06/2023]
Abstract
Kisspeptin, as well as insulin-like growth factor-1 (IGF-1), act centrally to stimulate luteinizing hormone-releasing hormone (LHRH) secretion at puberty. IGF-1 can induce KiSS-1 gene expression as an early pubertal event; however, the signaling pathway mediating this effect is not known. Since alcohol (ALC) blocks IGF-1 induced LHRH release acutely, we assessed whether this drug could affect IGF-1 stimulated prepubertal KiSS-1 gene expression following a binge type of exposure. Immature female rats were administered either ALC (3 g/kg) or water via gastric gavage at 07.30 h. At 09.00 h the ALC and control groups were subdivided where half received either saline or IGF-1 (200 ng) into the third ventricle. A second dose of ALC (1.5, 2 and 3 g/kg) or water was administered at 11.30 h. These regimens produced moderate blood alcohol concentrations of 77, 89 and 117 mg/dl, respectively, over the time course of the experiment. Rats were sacrificed 6 h after the IGF-1 injection and tissues containing the anteroventral periventricular (AVPV) and arcuate (ARC) nuclei were collected. IGF-1 stimulated (P<0.01) KiSS-1 gene expression in the AVPV nucleus at 6 h, but did not affect expression of the kisspeptin receptor, GPR54. While ALC did not alter basal expression of either gene, its dose dependently blocked IGF-1-induced KiSS-1 gene expression in the AVPV nucleus. No changes were observed in the ARC nucleus. Assessment of IGF-1 signaling indicated that the acute administration of IGF-1, ALC, or both did not alter the basal expression of IGF-1 receptor protein. However, IGF-1 stimulated (P<0.05) phosphorylated Akt protein over basal levels, an action blocked by ALC. Our results indicate that the IGF-1 induction of KiSS-1 gene expression is mediated by Akt activation, and that ALC alters this important prepubertal action of IGF-1.
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Affiliation(s)
- J K Hiney
- Department of Integrative Biosciences, College of Veterinary Medicine, Texas A and M University College Station, TX 77843-4458, USA.
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29
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Dees WL, Srivastava V, Hiney JK. Actions and interactions of alcohol and insulin-like growth factor-1 on female pubertal development. Alcohol Clin Exp Res 2009; 33:1847-56. [PMID: 19719789 PMCID: PMC4547620 DOI: 10.1111/j.1530-0277.2009.01041.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Alcohol (ALC) is a drug that is capable of disrupting reproductive function in adolescent humans, as well as immature rhesus monkeys and rats. Critical to determining the mechanism(s) of the effects of ALC on the pubertal process is to have a better understanding of the important events involved in the initiation of puberty. For years it has been hypothesized that there may be metabolic signals capable of linking somatic growth to the activation of the reproductive system at the time of puberty. In recent years it has been shown that insulin-like growth factor-1 (IGF-1) is one such signal that plays an early role in the pubertal process. In this review, we will describe the actions and interactions of ALC and IGF-1 on molecular and physiological processes associated with pubertal development.
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Affiliation(s)
- W Les Dees
- Department of Integrative Biosciences, Texas A&M University, College Station, TX, USA.
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Srivastava VK, Hiney JK, Dees WL. Short-term alcohol administration alters KiSS-1 gene expression in the reproductive hypothalamus of prepubertal female rats. Alcohol Clin Exp Res 2009; 33:1605-14. [PMID: 19519717 DOI: 10.1111/j.1530-0277.2009.00992.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Kisspeptins bind to the G-protein-coupled receptor (GPR54) to activate hypothalamic luteinizing hormone releasing hormone (LHRH) secretion at the time of puberty. Alcohol (ALC) causes depressed prepubertal LHRH release, resulting in depressed luteinizing hormone (LH) secretion and delayed puberty. Because KiSS-1 and GPR54 are important to the onset of puberty, we assessed the effects of chronic ALC administration on basal expression of these puberty-related genes within the reproductive hypothalamus, as well as hormones and transduction signaling pathways contributing to their activity. METHODS Immature female rats were fed a liquid diet containing ALC for 6 days beginning when 27 days old. Controls received either companion isocaloric liquid diet or rat chow and water. Animals were decapitated on day 33, in the late juvenile stage of development. Blood was collected for the assessment of serum hormone levels. Brain tissues containing the anteroventral periventricular (AVPV) and arcuate (ARC) nuclei were obtained for assessing expression of specific puberty-related genes and proteins. RESULTS KiSS-1 mRNA levels in the AVPV and ARC nuclei were suppressed (p < 0.001) in the ALC-treated rats. GPR54 gene and protein expressions were both modestly increased (p < 0.05) in AVPV nucleus, but not in ARC nucleus. Alcohol exposure also resulted in suppressed serum levels of insulin-like growth factor-1 (IGF-1), LH, and estradiol (E(2)). As IGF-1, in the presence of E(2), can induce expression of the KiSS-1 gene, we assessed the potential for ALC to alter IGF-1 signaling in the reproductive hypothalamus. IGF-1 receptor gene and protein expressions were not altered. However, protein expression of phosphorylated Akt, a transduction signal used by IGF-1, was suppressed in the AVPV (p < 0.05) and ARC (p < 0.01) nuclei. CONCLUSIONS Alcohol causes suppressed KiSS-1 gene expression in the reproductive hypothalamus; hence, contributing to this drug's ability to cause suppressed LHRH secretion and disruption of the pubertal process. We suggest that this action, at least in part, is through altered IGF-1 signaling.
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Affiliation(s)
- Vinod K Srivastava
- Department of Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843-4458, USA
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Dissen GA, Dearth RK, Scott HM, Ojeda SR, Dees WL. Alcohol alters luteinizing hormone secretion in immature female rhesus monkeys by a hypothalamic action. Endocrinology 2004; 145:4558-64. [PMID: 15217984 DOI: 10.1210/en.2004-0517] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We determined whether the effect of alcohol (ALC) to suppress LH secretion in immature female monkeys is due to a hypothalamic or pituitary site of action. Beginning at 20 months of age, four monkeys received a single intragastric dose of ALC (2.4 g/kg), and four monkeys received an equal volume of a saline/sucrose solution daily until they were 36 months old. For the hypothalamic response test, two basal samples (3.5 ml) were collected at 15-min intervals via the saphenous vein, and then N-methyl-D-L-aspartic acid (NMA; 20 mg/kg) was given iv and four more blood samples collected. Three weeks later, this protocol was repeated except LH-releasing hormone (LHRH) (5 microg/kg) was used to test pituitary responsiveness. NMA or LHRH was administered 3 h after the ALC. After the pituitary challenge, each monkey was ovariectomized and 6 wk later, implanted with an indwelling subclavian vein catheter. Blood samples were drawn every 10 min for 8 h to assess effects of ALC on post-ovariectomy LH levels and the profile of LH pulsatile secretion. The hypothalamic challenge showed NMA stimulated LH release in control monkeys, an action that was blocked by ALC. The pituitary challenge revealed that LHRH stimulated LH release equally well in control and ALC-treated monkeys. A post-ovariectomy rise in LH was observed in both groups, but levels were 45% lower in ALC-treated monkeys. This reduction was attributed to an ALC-induced suppression of both baseline and amplitude of pulses. Results demonstrate that the ALC-induced suppression of LH in immature female rhesus monkeys is due to an inhibitory action of the drug at the hypothalamic level.
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Affiliation(s)
- Gregory A Dissen
- Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, Oregon 97006-3448, USA
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Hiney JK, Srivastava V, Dearth RK, Dees WL. Influence of estradiol on insulin-like growth factor-1-induced luteinizing hormone secretion. Brain Res 2004; 1013:91-7. [PMID: 15196971 DOI: 10.1016/j.brainres.2004.03.054] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/31/2004] [Indexed: 12/01/2022]
Abstract
Several studies suggest an interrelationship between estradiol (E2) and insulin-like growth factor-1 (IGF-1) at the hypothalamic level. The present study was designed to discern if the capability of IGF-1 to release LH and influence the timing of female puberty is influenced by E2. Twenty-eight-day-old female rats were ovariectomized (OVEX), then implanted with a third ventricular (3V) cannula. Two weeks later, these animals received subcutaneous (s.c.) injection of oil, or either one or two injections of E2 in the form of estradiol benzoate (1 microg). Forty-eight hours later, four basal blood samples were drawn then the animals received IGF-1 (200 ng) or saline via the 3V and four more blood samples were taken. Results indicated that E2 replacement lowered basal LH levels and IGF-1 induced a significant LH release in only animals that had E2 levels above 20 pg/ml. These levels of E2 were also associated with increases (p<0.05) in the expression of both IGF-1 receptor (IGF-1R) mRNA and protein. In order to further support the hypothesis that the action of IGF-1 at the time of puberty is influenced by E2, 24-day-old intact female rats received s.c. injection of sesame oil or 0.1 microg of E2. The next day, the E2-treated animals also received twice daily s.c. injections of either IGF-1 (500 ng) or saline until vaginal opening (VO) occurred. The animals that received E2 plus IGF-1 showed VO at 31.1 days, which was 2.5 days earlier (p<0.01) than E2-treated animals and 4 days earlier (p<0.001) than IGF-1-treated and saline control animals. Taken together, these results indicate that the hypothalamic action of IGF-1 to stimulate LH release and advance female pubertal development is dependent upon the influence of E2.
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Affiliation(s)
- Jill K Hiney
- Department of Veterinary Anatomy and Public Health, College of Veterinary Medicine, Texas A&M University, College Station, TX, 77843-4458, USA
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Alcohol Suppresses Insulin-Like Growth Factor-1 Gene Expression in Prepubertal Transgenic Female Mice Overexpressing the Bovine Growth Hormone Gene. Alcohol Clin Exp Res 2002. [DOI: 10.1097/00000374-200211000-00013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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34
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Chronic Effects of Prepubertal Ethanol Administration on Steroidogenic Acute Regulatory Protein in the Rat Ovary. Alcohol Clin Exp Res 2002. [DOI: 10.1097/00000374-200201000-00014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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