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Dignam JP, Sharma S, Stasinopoulos I, MacLean MR. Pulmonary arterial hypertension: Sex matters. Br J Pharmacol 2024; 181:938-966. [PMID: 37939796 DOI: 10.1111/bph.16277] [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: 03/01/2023] [Revised: 10/10/2023] [Accepted: 10/11/2023] [Indexed: 11/10/2023] Open
Abstract
Pulmonary arterial hypertension (PAH) is a complex disease of multifactorial origin. While registries have demonstrated that women are more susceptible to the disease, females with PAH have superior right ventricle (RV) function and a better prognosis than their male counterparts, a phenomenon referred to as the 'estrogen paradox'. Numerous pre-clinical studies have investigated the involvement of sex hormones in PAH pathobiology, often with conflicting results. However, recent advances suggest that abnormal estrogen synthesis, metabolism and signalling underpin the sexual dimorphism of this disease. Other sex hormones, such as progesterone, testosterone and dehydroepiandrosterone may also play a role. Several non-hormonal factor including sex chromosomes and epigenetics have also been implicated. Though the underlying pathophysiological mechanisms are complex, several compounds that modulate sex hormones levels and signalling are under investigation in PAH patients. Further elucidation of the estrogen paradox will set the stage for the identification of additional therapeutic targets for this disease.
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Affiliation(s)
- Joshua P Dignam
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, Scotland, UK
| | - Smriti Sharma
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, Scotland, UK
| | - Ioannis Stasinopoulos
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, Scotland, UK
- Mass Spectrometry Core, Edinburgh Clinical Research Facility, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, Scotland, UK
| | - Margaret R MacLean
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, Scotland, UK
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2
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Bellingacci L, Canonichesi J, Sciaccaluga M, Megaro A, Mazzocchetti P, Di Mauro M, Costa C, Di Filippo M, Pettorossi VE, Tozzi A. Locally Synthetized 17-β-Estradiol Reverses Amyloid-β-42-Induced Hippocampal Long-Term Potentiation Deficits. Int J Mol Sci 2024; 25:1377. [PMID: 38338656 PMCID: PMC10855267 DOI: 10.3390/ijms25031377] [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: 01/01/2024] [Revised: 01/19/2024] [Accepted: 01/20/2024] [Indexed: 02/12/2024] Open
Abstract
Amyloid beta 1-42 (Aβ42) aggregates acutely impair hippocampal long-term potentiation (LTP) of synaptic transmission, and 17β-estradiol is crucial for hippocampal LTP. We tested whether boosting the synthesis of neural-derived 17β-estradiol (nE2) saves hippocampal LTP by the neurotoxic action of Aβ42. Electrophysiological recordings were performed to measure dentate gyrus (DG) LTP in rat hippocampal slices. Using a pharmacological approach, we tested the ability of nE2 to counteract the LTP impairment caused by acute exposure to soluble Aβ42 aggregates. nE2 was found to be required for LTP in DG under physiological conditions. Blockade of steroid 5α-reductase with finasteride, by increasing nE2 synthesis from testosterone (T), completely recovered LTP in slices treated with soluble Aβ42 aggregates. Modulation of the glutamate N-methyl-D aspartate receptor (NMDAR) by memantine effectively rescued the LTP deficit observed in slices exposed to Aβ42, and memantine prevented LTP reduction observed under the blocking of nE2 synthesis. nE2 is able to counteract Aβ42-induced synaptic dysfunction. This effect depends on a rapid, non-genomic mechanism of action of nE2, which may share a common pathway with glutamate NMDAR signaling.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Alessandro Tozzi
- Department of Medicine and Surgery, University of Perugia, 06156 Perugia, Italy; (L.B.); (J.C.); (M.S.)
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3
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Harvey BJ, Harvey HM. Sex Differences in Colon Cancer: Genomic and Nongenomic Signalling of Oestrogen. Genes (Basel) 2023; 14:2225. [PMID: 38137047 PMCID: PMC10742859 DOI: 10.3390/genes14122225] [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: 12/10/2023] [Accepted: 12/14/2023] [Indexed: 12/24/2023] Open
Abstract
Colon cancer (CRC) is a prevalent malignancy that exhibits distinct differences in incidence, prognosis, and treatment responses between males and females. These disparities have long been attributed to hormonal differences, particularly the influence of oestrogen signalling. This review aims to provide a comprehensive analysis of recent advances in our understanding of the molecular mechanisms underlying sex differences in colon cancer and the protective role of membrane and nuclear oestrogen signalling in CRC development, progression, and therapeutic interventions. We discuss the epidemiological and molecular evidence supporting sex differences in colon cancer, followed by an exploration of the impact of oestrogen in CRC through various genomic and nongenomic signalling pathways involving membrane and nuclear oestrogen receptors. Furthermore, we examine the interplay between oestrogen receptors and other signalling pathways, in particular the Wnt/β-catenin proliferative pathway and hypoxia in shaping biological sex differences and oestrogen protective actions in colon cancer. Lastly, we highlight the potential therapeutic implications of targeting oestrogen signalling in the management of colon cancer and propose future research directions to address the current gaps in our understanding of this complex phenomenon.
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Affiliation(s)
- Brian J. Harvey
- Faculty of Medicine, Royal College of Surgeons in Ireland, RCSI University of Medicine and Health Sciences, D02 YN77 Dublin, Ireland
| | - Harry M. Harvey
- Princess Margaret Cancer Centre, Toronto, ON M5G 1Z5, Canada;
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4
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Galogre M, Rodin D, Pyatnitskiy M, Mackelprang M, Koman I. "A Review of HER2 overexpression and somatic mutations in cancers". Crit Rev Oncol Hematol 2023; 186:103997. [PMID: 37062337 DOI: 10.1016/j.critrevonc.2023.103997] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 03/14/2023] [Accepted: 04/13/2023] [Indexed: 04/18/2023] Open
Abstract
The Human Epidermal Growth Factor Receptor (HER) proteins family, which includes HER2, are membrane-bound receptors that activate many intracellular pathways associated with growth and development. When there are mutations in HER2, or when it becomes overexpressed, it can cause oncogenesis and offer differential prognosis and treatment across almost all cancer types. Both mutations in HER2 and its overexpression have distinct mechanisms by which they can cause these effects in cancers. This review outlines how HER2's normal pathway is altered in both overexpression and mutation and compiles all the well-known mechanisms by which HER2 can cause oncogenesis. Finally, this review briefly outlines how HER2 mutants and HER2 overexpression is detected, and how their detection can lead to different prognosis and treatment in cancers.
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Affiliation(s)
| | - Dmitry Rodin
- Institute of Personalised and Translational Medicine, Ariel University, Ariel, Israel Kiryat Hamada
| | - Mikhail Pyatnitskiy
- Institute of Biomedical Chemistry RAMS, Solianka st.,14, 109544, Moscow, Russia
| | | | - Igor Koman
- SmartOmica, Tērbatas iela 36 - 4, Latvia Rīga, LV-1011; Institute of Personalised and Translational Medicine, Ariel University, Ariel, Israel Kiryat Hamada
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5
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Role of Estrogens in Menstrual Migraine. Cells 2022; 11:cells11081355. [PMID: 35456034 PMCID: PMC9025552 DOI: 10.3390/cells11081355] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Revised: 04/10/2022] [Accepted: 04/11/2022] [Indexed: 11/17/2022] Open
Abstract
Migraine is a major neurological disorder affecting one in nine adults worldwide with a significant impact on health care and socioeconomic systems. Migraine is more prevalent in women than in men, with 17% of all women meeting the diagnostic criteria for migraine. In women, the frequency of migraine attacks shows variations over the menstrual cycle and pregnancy, and the use of combined hormonal contraception (CHC) or hormone replacement therapy (HRT) can unveil or modify migraine disease. In the general population, 18–25% of female migraineurs display a menstrual association of their headache. Here we present an overview on the evidence supporting the role of reproductive hormones, in particular estrogens, in the pathophysiology of migraine. We also analyze the efficacy and safety of prescribing exogenous estrogens as a potential treatment for menstrual-related migraine. Finally, we point to controversial issues and future research areas in the field of reproductive hormones and migraine.
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6
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Brann DW, Lu Y, Wang J, Zhang Q, Thakkar R, Sareddy GR, Pratap UP, Tekmal RR, Vadlamudi RK. Brain-derived estrogen and neural function. Neurosci Biobehav Rev 2021; 132:793-817. [PMID: 34823913 PMCID: PMC8816863 DOI: 10.1016/j.neubiorev.2021.11.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 10/26/2021] [Accepted: 11/12/2021] [Indexed: 01/02/2023]
Abstract
Although classically known as an endocrine signal produced by the ovary, 17β-estradiol (E2) is also a neurosteroid produced in neurons and astrocytes in the brain of many different species. In this review, we provide a comprehensive overview of the localization, regulation, sex differences, and physiological/pathological roles of brain-derived E2 (BDE2). Much of what we know regarding the functional roles of BDE2 has come from studies using specific inhibitors of the E2 synthesis enzyme, aromatase, as well as the recent development of conditional forebrain neuron-specific and astrocyte-specific aromatase knockout mouse models. The evidence from these studies support a critical role for neuron-derived E2 (NDE2) in the regulation of synaptic plasticity, memory, socio-sexual behavior, sexual differentiation, reproduction, injury-induced reactive gliosis, and neuroprotection. Furthermore, we review evidence that astrocyte-derived E2 (ADE2) is induced following brain injury/ischemia, and plays a key role in reactive gliosis, neuroprotection, and cognitive preservation. Finally, we conclude by discussing the key controversies and challenges in this area, as well as potential future directions for the field.
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Affiliation(s)
- Darrell W Brann
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA.
| | - Yujiao Lu
- Department of Neurosurgery, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Jing Wang
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Quanguang Zhang
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Roshni Thakkar
- Department of Neurology, Miller School of Medicine, University of Miami, Miami, FL, 33136, USA
| | - Gangadhara R Sareddy
- Department of Obstetrics and Gynecology, University of Texas Health, San Antoio TX, 78229, USA
| | - Uday P Pratap
- Department of Obstetrics and Gynecology, University of Texas Health, San Antoio TX, 78229, USA
| | - Rajeshwar R Tekmal
- Department of Obstetrics and Gynecology, University of Texas Health, San Antoio TX, 78229, USA
| | - Ratna K Vadlamudi
- Department of Obstetrics and Gynecology, University of Texas Health, San Antoio TX, 78229, USA; Audie L. Murphy Division, South Texas Veterans Health Care System, San Antonio, TX, 78229, USA.
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7
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Hernando C, Ortega-Morillo B, Tapia M, Moragón S, Martínez MT, Eroles P, Garrido-Cano I, Adam-Artigues A, Lluch A, Bermejo B, Cejalvo JM. Oral Selective Estrogen Receptor Degraders (SERDs) as a Novel Breast Cancer Therapy: Present and Future from a Clinical Perspective. Int J Mol Sci 2021; 22:ijms22157812. [PMID: 34360578 PMCID: PMC8345926 DOI: 10.3390/ijms22157812] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/15/2021] [Accepted: 07/19/2021] [Indexed: 01/21/2023] Open
Abstract
Estrogen receptor-positive (ER+) is the most common subtype of breast cancer. Endocrine therapy is the fundamental treatment against this entity, by directly or indirectly modifying estrogen production. Recent advances in novel compounds, such as cyclin-dependent kinase 4/6 inhibitors (CDK4/6i), or phosphoinositide 3-kinase (PI3K) inhibitors have improved progression-free survival and overall survival in these patients. However, some patients still develop endocrine resistance after or during endocrine treatment. Different underlying mechanisms have been identified as responsible for endocrine treatment resistance, where ESR1 gene mutations are one of the most studied, outstanding from others such as somatic alterations, microenvironment involvement and epigenetic changes. In this scenario, selective estrogen receptor degraders/downregulators (SERD) are one of the weapons currently in research and development against aromatase inhibitor- or tamoxifen-resistance. The first SERD to be developed and approved for ER+ breast cancer was fulvestrant, demonstrating also interesting activity in ESR1 mutated patients in the second line treatment setting. Recent investigational advances have allowed the development of new oral bioavailable SERDs. This review describes the evolution and ongoing studies in SERDs and new molecules against ER, with the hope that these novel drugs may improve our patients’ future landscape.
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Affiliation(s)
- Cristina Hernando
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
- Correspondence: (C.H.); (J.M.C.)
| | - Belén Ortega-Morillo
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
| | - Marta Tapia
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
| | - Santiago Moragón
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
| | - María Teresa Martínez
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
| | - Pilar Eroles
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
- Centro de Investigación Biomédica en Red de Oncología, CIBERONC-ISCIII, 28029 Madrid, Spain
- Departamento de Fisiología, Universidad de València, 46010 Valencia, Spain
| | - Iris Garrido-Cano
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
| | - Anna Adam-Artigues
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
| | - Ana Lluch
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
- Centro de Investigación Biomédica en Red de Oncología, CIBERONC-ISCIII, 28029 Madrid, Spain
| | - Begoña Bermejo
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
- Centro de Investigación Biomédica en Red de Oncología, CIBERONC-ISCIII, 28029 Madrid, Spain
| | - Juan Miguel Cejalvo
- Hospital Clínico de València, Instituto de Investigación INCLIVA, 46010 Valencia, Spain; (B.O.-M.); (M.T.); (S.M.); (M.T.M.); (I.G.-C.); (A.A.-A.); (A.L.); (B.B.)
- Centro de Investigación Biomédica en Red de Oncología, CIBERONC-ISCIII, 28029 Madrid, Spain
- Correspondence: (C.H.); (J.M.C.)
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8
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Cunha GR, Baskin L. Editorial: Developmental effects of estrogens. Differentiation 2021; 118:1-3. [PMID: 33516564 DOI: 10.1016/j.diff.2021.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 01/20/2021] [Indexed: 11/30/2022]
Affiliation(s)
- Gerald R Cunha
- Department of Urology, University of California, 400 Parnassus Avenue, San Francisco, CA, 94143, USA.
| | - Laurence Baskin
- Department of Urology, University of California, 400 Parnassus Avenue, San Francisco, CA, 94143, USA
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9
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Lu Y, Liu W. Selective Estrogen Receptor Degraders (SERDs): A Promising Strategy for Estrogen Receptor Positive Endocrine-Resistant Breast Cancer. J Med Chem 2020; 63:15094-15114. [PMID: 33138369 DOI: 10.1021/acs.jmedchem.0c00913] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Estrogen receptor (ER) plays important roles in gene transcription and the proliferation of ER positive breast cancers. Selective modulation of ER has been a therapeutic target for this specific type of breast cancer for more than 30 years. Selective estrogen receptor modulators (SERMs) and aromatase inhibitors (AIs) have been demonstrated to be effective therapeutic approaches for ER positive breast cancers. Unfortunately, 30-50% of ER positive tumors become resistant to SERM/AI treatment after 3-5 years. Fulvestrant, the only approved selective estrogen receptor degrader (SERD), is currently an important therapeutic approach for the treatment of endocrine-resistant breast cancers. The poor pharmacokinetic properties of fulvestrant have inspired the development of a new generation of oral SERDs to overcome drug resistance. In this review, we describe recent advances in ERα structure, functions, and mechanisms of endocrine resistance and summarize the development of oral SERDs in both academic and industrial areas.
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Affiliation(s)
- Yunlong Lu
- School of Medicine & Holistic Integrative Medicine, Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China.,Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Wukun Liu
- School of Medicine & Holistic Integrative Medicine, Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing 210023, China.,State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, P. R. China.,State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210023, P. R. China
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10
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Tozzi A, Bellingacci L, Pettorossi VE. Rapid Estrogenic and Androgenic Neurosteroids Effects in the Induction of Long-Term Synaptic Changes: Implication for Early Memory Formation. Front Neurosci 2020; 14:572511. [PMID: 33192257 PMCID: PMC7653679 DOI: 10.3389/fnins.2020.572511] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Accepted: 08/21/2020] [Indexed: 11/17/2022] Open
Abstract
Mounting experimental evidence demonstrate that sex neuroactive steroids (neurosteroids) are essential for memory formation. Neurosteroids have a profound impact on the function and structure of neural circuits and their local synthesis is necessary for the induction of both long-term potentiation (LTP) and long-term depression (LTD) of synaptic transmission and for neural spine formation in different areas of the central nervous system (CNS). Several studies demonstrated that in the hippocampus, 17β-estradiol (E2) is necessary for inducing LTP, while 5α-dihydrotestosterone (DHT) is necessary for inducing LTD. This contribution has been proven by administering sex neurosteroids in rodent models and by using blocking agents of their synthesis or of their specific receptors. The general opposite role of sex neurosteroids in synaptic plasticity appears to be dependent on their different local availability in response to low or high frequency of synaptic stimulation, allowing the induction of bidirectional synaptic plasticity. The relevant contribution of these neurosteroids to synaptic plasticity has also been described in other brain regions involved in memory processes such as motor learning, as in the case of the vestibular nuclei, the cerebellum, and the basal ganglia, or as the emotional circuit of the amygdala. The rapid effects of sex neurosteroids on neural synaptic plasticity need the maintenance of a tonic or phasic local steroid synthesis determined by neural activity but might also be influenced by circulating hormones, age, and gender. To disclose the exact mechanisms how sex neurosteroids participate in finely tuning long-term synaptic changes and spine remodeling, further investigation is required.
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Affiliation(s)
- Alessandro Tozzi
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | - Laura Bellingacci
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
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11
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Xue J, Dai Y, Li G, Lang W, Li P, Liu Y, Bao H, Zhao D, Pan H. DEC1 directly interacts with estrogen receptor (ER) α to suppress proliferation of ER-positive breast cancer cells. Biochem Biophys Res Commun 2020; 528:740-745. [PMID: 32522343 DOI: 10.1016/j.bbrc.2020.05.123] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 05/16/2020] [Indexed: 11/15/2022]
Abstract
Aberrant ERα signaling and altered circadian rhythms are both features of ER-positive breast cancer, however, the molecular interaction between them is still not fully understood. Herein, we analyzed the interplay between the circadian rhythm molecule DEC1 and ERα and its effect on the proliferation of ER-positive breast cancer cells, providing a new clue for clarifying the pathogenesis of breast cancer. In this study, we revealed that DEC1 negatively regulates the proliferation of ER-positive breast cancer MCF-7 cells through interaction with ERα protein. DEC1 co-localized with ERα in the nucleus of MCF7 cells, stabilized ERα protein independently of its transcriptional activity and without affecting by estrogen stimulation and inhibited the degradation of ERα mediated by CHX in a time-dependent manner. Moreover, results from luciferase reporter assay showed that overexpression of DEC1 significantly inhibits ERα-mediated transcriptional activity in a dose-dependent manner. These results together suggested that DEC1 may serve as a co-repressor of ERα in ER-positive breast cancer. Although DEC1 improved the stability of ERα and alleviated protein degradation, DEC1 inhibited the proliferation of MCF7 cells by decreasing ERα-mediated signal transduction.
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Affiliation(s)
- Jing Xue
- School of Medical Technolog, Qiqihar Medical University, Qiqihar, Heilongjiang, China
| | - Yunfeng Dai
- The Second Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang, China
| | - Guofeng Li
- Basic Medical Science College, Qiqihar Medical University, Qiqihar, Heilongjiang, China
| | - Weiya Lang
- Basic Medical Science College, Qiqihar Medical University, Qiqihar, Heilongjiang, China
| | - Penghui Li
- Clinical Laboratory, Qiqihar Jianhua Hospital, Qiqihar, Heilongjiang, China
| | - Yunlong Liu
- The Second Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang, China
| | - Hongguang Bao
- The Second Affiliated Hospital of Qiqihar Medical University, Qiqihar, Heilongjiang, China
| | - Dalong Zhao
- Clinical Laboratory, Qiqihar Jianhua Hospital, Qiqihar, Heilongjiang, China
| | - Hongming Pan
- School of Medical Technolog, Qiqihar Medical University, Qiqihar, Heilongjiang, China.
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12
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Jankovicova J, Frolikova M, Palenikova V, Valaskova E, Cerny J, Secova P, Bartokova M, Horovska L, Manaskova-Postlerova P, Antalikova J, Komrskova K. Expression and distribution of CD151 as a partner of alpha6 integrin in male germ cells. Sci Rep 2020; 10:4374. [PMID: 32152440 PMCID: PMC7062741 DOI: 10.1038/s41598-020-61334-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 02/24/2020] [Indexed: 12/22/2022] Open
Abstract
The physiological importance of CD151 tetraspanin is known from somatic cells and its outside-in signalling through integrins was described. In male germ cells, two tetraspanins, CD9 and CD81, are involved in sperm-egg membrane fusion, and similarly to integrins, they occupy characteristic regions. We report here on a newly discovered presence of CD151 in sperm, and present its expression and distribution during spermatogenesis and sperm transition during the acrosome reaction. We traced CD151 gene and protein expression in testicular cell subpopulations, with strong enrichment in spermatogonia and spermatids. The testicular and epididymal localization pattern is designated to the sperm head primary fusion site called the equatorial segment and when compared to the acrosome vesicle status, CD151 was located into the inner acrosomal membrane overlying the nucleus. Moreover, we show CD151 interaction with α6 integrin subunit, which forms a dimer with β4 as a part of cis-protein interactions within sperm prior to gamete fusion. We used mammalian species with distinct sperm morphology and sperm maturation such as mouse and bull and compared the results with human. In conclusion, the delivered findings characterise CD151 as a novel sperm tetraspanin network member and provide knowledge on its physiology in male germ cells.
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Affiliation(s)
- J Jankovicova
- Laboratory of Reproductive Physiology, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Dubravska cesta 9, 845 05, Bratislava, Slovak Republic
| | - M Frolikova
- Laboratory of Reproductive Biology, Institute of Biotechnology, Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50, Vestec, Czech Republic
| | - V Palenikova
- Laboratory of Reproductive Biology, Institute of Biotechnology, Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50, Vestec, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Hlavova 8, 128 40, Prague 2, Czech Republic
| | - E Valaskova
- Laboratory of Reproductive Biology, Institute of Biotechnology, Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50, Vestec, Czech Republic
| | - J Cerny
- Laboratory of Structural Bioinformatics of Proteins, Institute of Biotechnology, Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50, Vestec, Czech Republic
| | - P Secova
- Laboratory of Reproductive Physiology, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Dubravska cesta 9, 845 05, Bratislava, Slovak Republic
| | - M Bartokova
- Laboratory of Reproductive Physiology, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Dubravska cesta 9, 845 05, Bratislava, Slovak Republic
| | - L Horovska
- Laboratory of Reproductive Physiology, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Dubravska cesta 9, 845 05, Bratislava, Slovak Republic
| | - P Manaskova-Postlerova
- Laboratory of Reproductive Biology, Institute of Biotechnology, Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50, Vestec, Czech Republic.,Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, University of Life Sciences Prague, Kamycka 129, 165 00, Prague 6, Czech Republic
| | - J Antalikova
- Laboratory of Reproductive Physiology, Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Dubravska cesta 9, 845 05, Bratislava, Slovak Republic.
| | - K Komrskova
- Laboratory of Reproductive Biology, Institute of Biotechnology, Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50, Vestec, Czech Republic. .,Department of Zoology, Faculty of Science, Charles University, Vinicna 7, 128 44, Prague 2, Czech Republic.
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13
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Tang ZR, Zhang R, Lian ZX, Deng SL, Yu K. Estrogen-Receptor Expression and Function in Female Reproductive Disease. Cells 2019; 8:cells8101123. [PMID: 31546660 PMCID: PMC6830311 DOI: 10.3390/cells8101123] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 09/20/2019] [Accepted: 09/20/2019] [Indexed: 01/13/2023] Open
Abstract
Estrogen receptors (ER) include ER alpha, ER beta and new membrane receptor G protein-coupled receptor 30 (GPR30). Estrogen receptors are key receptors to maintain ovarian granulosa cell differentiation, follicle and oocyte growth and development, and ovulation function. The abnormal functions of estrogen, its receptors, and estradiol synthesis-related enzymes are closely related to clinical reproductive endocrine diseases, such as polycystic ovary syndrome (PCOS) and endometriosis (EMS). At present, hormone therapy is the main treatment for ovarian-related diseases, and a stable hormone environment is established by regulating ovarian function. In recent years, some estrogen-related drugs have made great progress, such as clomiphene, which is a nonsteroidal antiestrogen drug in clinical application. This article elaborates on the regulatory role of estrogen and its nuclear receptors and membrane receptors in oocyte development, especially female reproductive diseases related to the abnormal expression of estrogen and its receptors. We also highlighted the latest advances of treatment strategy for these diseases and the application of related targeted small molecule drugs in clinical research and treatment, so as to provide reference for the treatment of female reproductive diseases.
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Affiliation(s)
- Zi-Run Tang
- Beijing Key Laboratory for Animal Genetic Improvement, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
| | - Rui Zhang
- Beijing Key Laboratory for Animal Genetic Improvement, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
| | - Zheng-Xing Lian
- Beijing Key Laboratory for Animal Genetic Improvement, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
| | - Shou-Long Deng
- CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing 100101, China.
| | - Kun Yu
- Beijing Key Laboratory for Animal Genetic Improvement, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China.
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14
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Meroni SB, Galardo MN, Rindone G, Gorga A, Riera MF, Cigorraga SB. Molecular Mechanisms and Signaling Pathways Involved in Sertoli Cell Proliferation. Front Endocrinol (Lausanne) 2019; 10:224. [PMID: 31040821 PMCID: PMC6476933 DOI: 10.3389/fendo.2019.00224] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 03/21/2019] [Indexed: 12/16/2022] Open
Abstract
Sertoli cells are somatic cells present in seminiferous tubules which have essential roles in regulating spermatogenesis. Considering that each Sertoli cell is able to support a limited number of germ cells, the final number of Sertoli cells reached during the proliferative period determines sperm production capacity. Only immature Sertoli cells, which have not established the blood-testis barrier, proliferate. A number of hormonal cues regulate Sertoli cell proliferation. Among them, FSH, the insulin family of growth factors, activin, and cytokines action must be highlighted. It has been demonstrated that cAMP/PKA, ERK1/2, PI3K/Akt, and mTORC1/p70SK6 pathways are the main signal transduction pathways involved in Sertoli cell proliferation. Additionally, c-Myc and hypoxia inducible factor are transcription factors which participate in the induction by FSH of various genes of relevance in cell cycle progression. Cessation of proliferation is a pre-requisite to Sertoli cell maturation accompanied by the establishment of the blood-testis barrier. With respect to this barrier, the participation of androgens, estrogens, thyroid hormones, retinoic acid and opioids has been reported. Additionally, two central enzymes that are involved in sensing cell energy status have been associated with the suppression of Sertoli cell proliferation, namely AMPK and Sirtuin 1 (SIRT1). Among the molecular mechanisms involved in the cessation of proliferation and in the maturation of Sertoli cells, it is worth mentioning the up-regulation of the cell cycle inhibitors p21Cip1, p27Kip, and p19INK4, and of the gap junction protein connexin 43. A decrease in Sertoli cell proliferation due to administration of certain therapeutic drugs and exposure to xenobiotic agents before puberty has been experimentally demonstrated. This review focuses on the hormones, locally produced factors, signal transduction pathways, and molecular mechanisms controlling Sertoli cell proliferation and maturation. The comprehension of how the final number of Sertoli cells in adulthood is established constitutes a pre-requisite to understand the underlying causes responsible for the progressive decrease in sperm production that has been observed during the last 50 years in humans.
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15
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Blalock BJ, Robinson WE, Loguinov A, Vulpe CD, Krick KS, Poynton HC. Transcriptomic and Network Analyses Reveal Mechanistic-Based Biomarkers of Endocrine Disruption in the Marine Mussel, Mytilus edulis. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:9419-9430. [PMID: 29953215 DOI: 10.1021/acs.est.8b01604] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Transcriptomics, high-throughput assays, and adverse outcome pathways (AOP) are promising approaches applied to toxicity monitoring in the 21st century, but development of these methods is challenging for nonmodel organisms and emerging contaminants. For example, Endocrine Disrupting Compounds (EDCs) may cause reproductive impairments and feminization of male bivalves; however, the mechanism linked to this adverse outcome is unknown. To develop mechanism-based biomarkers that may be linked through an AOP, we exposed Mytilus edulis to 17-alpha-ethinylestradiol (5 and 50 ng/L) and 4-nonylphenol (1 and 100 μg/L) for 32 and 39 days. When mussels were exposed to these EDCs, we found elevated female specific transcripts and significant female-skewed sex ratios using a RT-qPCR assay. We performed gene expression analysis on digestive gland tissue using an M. edulis microarray and through network and targeted analyses identified the nongenomic estrogen signaling pathway and steroidogenesis pathway as the likely mechanisms of action for a putative AOP. We also identified several homologues to genes within the vertebrate steroidogenesis pathway including the cholesterol side chain cleavage complex. From this AOP, we designed the Coastal Biosensor for Endocrine Disruption (C-BED) assay which was confirmed in the laboratory and tested in the field.
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Affiliation(s)
- Bonnie J Blalock
- School for the Environment , University of Massachusetts Boston , Boston , Massachusetts 02125 United States
| | - William E Robinson
- School for the Environment , University of Massachusetts Boston , Boston , Massachusetts 02125 United States
| | - Alexandre Loguinov
- Center for Environmental and Human Toxicology , University of Florida , Gainesville , Florida 32611 United States
| | - Chris D Vulpe
- Center for Environmental and Human Toxicology , University of Florida , Gainesville , Florida 32611 United States
| | - Keegan S Krick
- School for the Environment , University of Massachusetts Boston , Boston , Massachusetts 02125 United States
| | - Helen C Poynton
- School for the Environment , University of Massachusetts Boston , Boston , Massachusetts 02125 United States
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16
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Yoest KE, Quigley JA, Becker JB. Rapid effects of ovarian hormones in dorsal striatum and nucleus accumbens. Horm Behav 2018; 104:119-129. [PMID: 29626485 PMCID: PMC6197937 DOI: 10.1016/j.yhbeh.2018.04.002] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 03/30/2018] [Accepted: 04/02/2018] [Indexed: 12/31/2022]
Abstract
Contribution to Special Issue on Fast effects of steroids. Estradiol and progesterone rapidly induce changes in dopaminergic signaling within the dorsal striatum and nucleus accumbens of female rats. In ovariectomized females, estradiol rapidly enhances dopamine release and modulates binding of dopamine receptors. Progesterone further potentiates the effect of estradiol on dopamine release. The effects of both estradiol and progesterone are time course dependent, with increases in dopamine release immediately after acute hormone administration followed by later inhibition of dopamine release. Importantly, these changes are also seen in naturally cycling females, indicating their importance for normal physiological states and relevant reproductive behaviors. Here, we summarize the literature establishing the rapid effects of estradiol and progesterone on dopamine release and receptor expression in dorsal striatum and nucleus accumbens of both males and females. Integrating this literature with the larger body of work focusing on dopamine regulated behaviors, we propose hypotheses for adaptive reasons (i.e., ultimate causes) as to why changes in ovarian hormones modulate dopamine release. Finally, we note the importance of these studies for understanding sex differences in vulnerability to drug addiction. Research on how dopaminergic systems regulate behavior in both males and females is crucial for developing a full appreciation of dopamine's role in both natural and drug-induced behaviors.
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Affiliation(s)
- Katie E Yoest
- Department of Psychology, Molecular and Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, United States
| | - Jacqueline A Quigley
- Department of Psychology, Molecular and Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, United States
| | - Jill B Becker
- Department of Psychology, Molecular and Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, United States.
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17
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Kow LM, Pfaff DW. Can distinctly different rapid estrogen actions share a common mechanistic step? Horm Behav 2018; 104:156-164. [PMID: 29476777 DOI: 10.1016/j.yhbeh.2018.02.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 02/15/2018] [Accepted: 02/19/2018] [Indexed: 12/23/2022]
Abstract
Contribution to Special Issue on Fast effects of steroids. This paper reviews early evidence for the existence of rapid, non-genomic effects of estrogens on neurons, and, further, proposes that these rapid effects are often synergistic with later, genomic effects. Finally, suggestions about potential molecular mechanisms underlying the rapid effects of estrogens are offered. A mechanistic step we propose to be common among rapid estrogenic actions includes membrane ER's binding to histamine, and NMDA receptors and subsequent dimerization, and clustering (respectively) in a manner that enhances histamine and NMDA actions.
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Affiliation(s)
- Lee-Ming Kow
- Laboratory of Neurobiology and Behavior, The Rockefeller University, New York, NY, United States.
| | - Donald W Pfaff
- Laboratory of Neurobiology and Behavior, The Rockefeller University, New York, NY, United States
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18
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Martin A, Yu J, Xiong J, Khalid AB, Katzenellenbogen B, Kim SH, Katzenellenbogen JA, Malaivijitnond S, Gabet Y, Krum SA, Frenkel B. Estrogens and androgens inhibit association of RANKL with the pre-osteoblast membrane through post-translational mechanisms. J Cell Physiol 2017; 232:3798-3807. [PMID: 28213978 DOI: 10.1002/jcp.25862] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 02/16/2017] [Indexed: 12/26/2022]
Abstract
We have recently demonstrated that RUNX2 promoted, and 17β-Estradiol (E2) diminished, association of RANKL with the cell membrane in pre-osteoblast cultures. Here we show that, similar to E2, dihydrotestosterone (DHT) diminishes association of RANKL, and transiently transfected GFP-RANKL with the pre-osteoblast membrane without decreasing total RANKL mRNA or protein levels. Diminution of membrane-associated RANKL was accompanied with marked suppression of osteoclast differentiation from co-cultured pre-osteoclasts, even though DHT increased, not decreased, RANKL concentrations in pre-osteoblast conditioned media. A marked decrease in membrane-associated RANKL was observed after 30 min of either E2 or DHT treatment, and near-complete inhibition was observed by 1 hr, suggesting that the diminution of RANKL membrane association was mediated through non-genomic mechanisms. Further indicating dispensability of nuclear action of estrogen receptor, E2-mediated inhibition of RANKL membrane association was mimicked by an estrogen dendrimer conjugate (EDC) that cannot enter the cell nucleus. Finally, the inhibitory effect of E2 and DHT on RANKL membrane association was counteracted by the MMP inhibitor NNGH, and the effect of E2 (and not DHT) was antagonized by the Src inhibitor SU6656. Taken together, these results suggest that estrogens and androgens inhibit osteoblast-driven osteoclastogenesis through non-genomic mechanism(s) that entail, MMP-mediated RANKL dissociation from the cell membrane.
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Affiliation(s)
- Anthony Martin
- Department of Biochemistry and Molecular Medicine , Keck School of Medicine, University of Southern California, Los Angeles, California.,Institute for Genetic Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, California
| | - Jiali Yu
- Department of Biochemistry and Molecular Medicine , Keck School of Medicine, University of Southern California, Los Angeles, California.,Institute for Genetic Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, California
| | - Jian Xiong
- Department of Biochemistry and Molecular Medicine , Keck School of Medicine, University of Southern California, Los Angeles, California.,Institute for Genetic Medicine, Keck School of Medicine of the University of Southern California, Los Angeles, California
| | - Aysha B Khalid
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, Tennessee
| | | | - Sung Hoon Kim
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | | | | | - Yankel Gabet
- Sackler Faculty of Medicine, Departments of Anatomy and Anthropology and Orthopedic Surgery, Tel Aviv University, Tel Aviv, Israel
| | - Susan A Krum
- Department of Orthopaedic Surgery and Biomedical Engineering, University of Tennessee Health Science Center, Memphis, Tennessee
| | - Baruch Frenkel
- Department of Biochemistry and Molecular Medicine , Keck School of Medicine, University of Southern California, Los Angeles, California.,Department of Orthopedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California
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19
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Sexual Dimorphism in a Reciprocal Interaction of Ryanodine and IP 3 Receptors in the Induction of Hyperalgesic Priming. J Neurosci 2017; 37:2032-2044. [PMID: 28115480 DOI: 10.1523/jneurosci.2911-16.2017] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 01/12/2017] [Accepted: 01/13/2017] [Indexed: 12/15/2022] Open
Abstract
Hyperalgesic priming, a model of pain chronification in the rat, is mediated by ryanodine receptor-dependent calcium release. Although ryanodine induces priming in both sexes, females are 5 orders of magnitude more sensitive, by an estrogen receptor α (EsRα)-dependent mechanism. An inositol 1,4,5-triphosphate (IP3) receptor inhibitor prevented the induction of priming by ryanodine. For IP3 induced priming, females were also more sensitive. IP3-induced priming was prevented by pretreatment with inhibitors of the sarcoendoplasmic reticulum calcium ATPase and ryanodine receptor. Antisense to EsRα prevented the induction of priming by low-dose IP3 in females. The induction of priming by an EsRα agonist was ryanodine receptor-dependent and prevented by the IP3 antagonist. Thus, an EsRα-dependent bidirectional interaction between endoplasmic reticulum IP3 and ryanodine receptor-mediated calcium signaling is present in the induction of hyperalgesic priming, in females. In cultured male DRG neurons, IP3 (100 μm) potentiated depolarization-induced transients produced by extracellular application of high-potassium solution (20 mm, K20), in nociceptors incubated with β-estradiol. This potentiation of depolarization-induced calcium transients was blocked by the IP3 antagonist, and not observed in the absence of IP3 IP3 potentiation was also blocked by ryanodine receptor antagonist. The application of ryanodine (2 nm), instead of IP3, also potentiated K20-induced calcium transients in the presence of β-estradiol, in an IP3 receptor-dependent manner. Our results point to an EsRα-dependent, reciprocal interaction between IP3 and ryanodine receptors that contributes to sex differences in hyperalgesic priming.SIGNIFICANCE STATEMENT The present study demonstrates a mechanism that plays a role in the marked sexual dimorphism observed in a model of the transition to chronic pain, hyperalgesic priming. This mechanism involves a reciprocal interaction between the endoplasmic reticulum receptors, IP3 and ryanodine, in the induction of priming, regulated by estrogen receptor α in the nociceptor of female rats. The presence of this signaling pathway modulating the susceptibility of nociceptors to develop plasticity may contribute to our understanding of sex differences observed clinically in chronic pain syndromes.
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20
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Chan HJ, Petrossian K, Chen S. Structural and functional characterization of aromatase, estrogen receptor, and their genes in endocrine-responsive and -resistant breast cancer cells. J Steroid Biochem Mol Biol 2016; 161:73-83. [PMID: 26277097 PMCID: PMC4752924 DOI: 10.1016/j.jsbmb.2015.07.018] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2015] [Revised: 07/22/2015] [Accepted: 07/29/2015] [Indexed: 11/22/2022]
Abstract
Aromatase and estrogen receptor α (ER) are two key proteins for the proliferation of endocrine-responsive and -resistant breast cancers. Aromatase is an enzyme involved in the conversion of androgen (such as testosterone) to estrogen (such as 17β-estradiol). It is also a very effective therapeutic target for the treatment of endocrine-responsive breast cancer. Comparing endocrine-responsive and -resistant breast cancer, aromatase protein levels do not change significantly. Aromatase activity; however, can be increased via PI3K/Akt/IGFR signaling pathways in endocrine resistant cells. The activity of aromatase has been reported to be modulated by phosphorylation. The ER is an important steroid nuclear receptor in the proliferation of both endocrine-responsive and -resistant cells. Although the mutation or amplification of ER can cause endocrine resistance, it is not commonly found. Some point mutations and translocation events have been characterized and shown to promote estrogen-independent growth. Phosphorylation by cross-talk with growth factor pathways is one of the main mechanisms for ligand-independent activation of ER. Taken together, both ER and aromatase are important in ER-dependent breast cancer and the development of endocrine resistance.
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Affiliation(s)
- Hei Jason Chan
- Department of Cancer Biology, Beckman Research Institute of the City of Hope, Duarte, CA, United States
| | - Karineh Petrossian
- Department of Cancer Biology, Beckman Research Institute of the City of Hope, Duarte, CA, United States
| | - Shiuan Chen
- Department of Cancer Biology, Beckman Research Institute of the City of Hope, Duarte, CA, United States.
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21
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Zhao TZ, Shi F, Hu J, He SM, Ding Q, Ma LT. GPER1 mediates estrogen-induced neuroprotection against oxygen-glucose deprivation in the primary hippocampal neurons. Neuroscience 2016; 328:117-26. [DOI: 10.1016/j.neuroscience.2016.04.026] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 04/10/2016] [Accepted: 04/17/2016] [Indexed: 10/21/2022]
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22
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Tagawa N, Kubota S, Kobayashi Y, Kato I. Genistein inhibits glucocorticoid amplification in adipose tissue by suppression of 11β-hydroxysteroid dehydrogenase type 1. Steroids 2015; 93:77-86. [PMID: 25447798 DOI: 10.1016/j.steroids.2014.11.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 10/15/2014] [Accepted: 11/18/2014] [Indexed: 11/20/2022]
Abstract
Excess glucocorticoids promote visceral obesity, hyperlipidemia, and insulin resistance. The main regulator of intracellular glucocorticoid levels is 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1), which converts inactive glucocorticoids into bioactive forms such as cortisol in humans and corticosterone in rodents. Hexose-6-phosphate dehydrogenase (H6PD), which is colocalized with 11β-HSD1 in the intralumen of the endoplasmic reticulum, supplies a crucial coenzyme, NADPH, for full reductase activity of 11β-HSD1. Therefore, it is possible that inhibition of 11β-HSD1 will become a considerable medical treatment for metabolic diseases including obesity and diabetes. Genistein, a soy isoflavone, has received attention for its therapeutic potential for obesity, diabetes, and cardiovascular disease, and has been proposed as a promising compound for the treatment of metabolic disorders. However, the mechanisms underlying the pleiotropic anti-obesity effects of genistein have not been fully clarified. Here, we demonstrate that genistein was able to inhibit 11β-HSD1 and H6PD activities within 10 or 20min, in dose- and time-dependent manners. Inhibition of 11β-HSD2 activity was not observed in rat kidney microsomes. The inhibition was not reversed by two estrogen receptor antagonists, tamoxifen and ICI182,780. A kinetic study revealed that genistein acted as a non-competitive inhibitor of 11β-HSD1, and its apparent Km value for 11-dehydrocorticosterone was 0.5μM. Genistein also acted as a non-competitive inhibitor of H6PD, and its apparent Km values for G6P and NADP were 0.9 and 3.3μM, respectively. These results suggest that genistein may exert its inhibitory effect by interacting with these enzymes.
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Affiliation(s)
- Noriko Tagawa
- Department of Medical Biochemistry, Kobe Pharmaceutical University, Kobe, Japan.
| | - Sayaka Kubota
- Department of Medical Biochemistry, Kobe Pharmaceutical University, Kobe, Japan
| | - Yoshiharu Kobayashi
- Department of Medical Biochemistry, Kobe Pharmaceutical University, Kobe, Japan
| | - Ikuo Kato
- Department of Medical Biochemistry, Kobe Pharmaceutical University, Kobe, Japan
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23
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Tang H, Zhang Q, Yang L, Dong Y, Khan M, Yang F, Brann DW, Wang R. Reprint of "GPR30 mediates estrogen rapid signaling and neuroprotection". Mol Cell Endocrinol 2014; 389:92-8. [PMID: 24835924 DOI: 10.1016/j.mce.2014.05.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Revised: 01/16/2014] [Accepted: 01/16/2014] [Indexed: 02/04/2023]
Abstract
G-protein-coupled estrogen receptor-30 (GPR30), also known as G-protein estrogen receptor-1 (GPER1), is a putative extranuclear estrogen receptor whose precise functions in the brain are poorly understood. Studies using exogenous administration of the GPR30 agonist, G1 suggests that GPR30 may have a neuroprotective role in cerebral ischemia. However, the physiological role of GPR30 in mediating estrogen (E2)-induced neuroprotection in cerebral ischemia remains unclear. Also unclear is whether GPR30 has a role in mediating rapid signaling by E2 after cerebral ischemia, which is thought to underlie its neuroprotective actions. To address these deficits in our knowledge, the current study examined the effect of antisense oligonucleotide (AS) knockdown of GPR30 in the hippocampal CA1 region upon E2-BSA-induced neuroprotection and rapid kinase signaling in a rat model of global cerebral ischemia (GCI). Immunohistochemistry demonstrated that GPR30 is strongly expressed in the hippocampal CA1 region and dentate gyrus, with less expression in the CA3 region. E2-BSA exerted robust neuroprotection of hippocampal CA1 neurons against GCI, an effect abrogated by AS knockdown of GPR30. Missense control oligonucleotides had no effect upon E2-BSA-induced neuroprotection, indicating specificity of the effect. The GPR30 agonist, G1 also exerted significant neuroprotection against GCI. E2-BSA and G1 also rapidly enhanced activation of the prosurvival kinases, Akt and ERK, while decreasing proapototic JNK activation. Importantly, AS knockdown of GPR30 markedly attenuated these rapid kinase signaling effects of E2-BSA. As a whole, the studies provide evidence of an important role of GPR30 in mediating the rapid signaling and neuroprotective actions of E2 in the hippocampus.
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Affiliation(s)
- Hui Tang
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA; Neurobiology Institute, Medical Research Center, Hebei United University, Tangshan 063000, China
| | - Quanguang Zhang
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA
| | - Licai Yang
- Neurobiology Institute, Medical Research Center, Hebei United University, Tangshan 063000, China
| | - Yan Dong
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA
| | - Mohammad Khan
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA
| | - Fang Yang
- Neurobiology Institute, Medical Research Center, Hebei United University, Tangshan 063000, China
| | - Darrell W Brann
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA.
| | - Ruimin Wang
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA; Neurobiology Institute, Medical Research Center, Hebei United University, Tangshan 063000, China.
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24
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Tang H, Zhang Q, Yang L, Dong Y, Khan M, Yang F, Brann DW, Wang R. GPR30 mediates estrogen rapid signaling and neuroprotection. Mol Cell Endocrinol 2014; 387:52-8. [PMID: 24594140 PMCID: PMC4019970 DOI: 10.1016/j.mce.2014.01.024] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Revised: 01/16/2014] [Accepted: 01/16/2014] [Indexed: 01/09/2023]
Abstract
G-protein-coupled estrogen receptor-30 (GPR30), also known as G-protein estrogen receptor-1 (GPER1), is a putative extranuclear estrogen receptor whose precise functions in the brain are poorly understood. Studies using exogenous administration of the GPR30 agonist, G1 suggests that GPR30 may have a neuroprotective role in cerebral ischemia. However, the physiological role of GPR30 in mediating estrogen (E2)-induced neuroprotection in cerebral ischemia remains unclear. Also unclear is whether GPR30 has a role in mediating rapid signaling by E2 after cerebral ischemia, which is thought to underlie its neuroprotective actions. To address these deficits in our knowledge, the current study examined the effect of antisense oligonucleotide (AS) knockdown of GPR30 in the hippocampal CA1 region upon E2-BSA-induced neuroprotection and rapid kinase signaling in a rat model of global cerebral ischemia (GCI). Immunohistochemistry demonstrated that GPR30 is strongly expressed in the hippocampal CA1 region and dentate gyrus, with less expression in the CA3 region. E2-BSA exerted robust neuroprotection of hippocampal CA1 neurons against GCI, an effect abrogated by AS knockdown of GPR30. Missense control oligonucleotides had no effect upon E2-BSA-induced neuroprotection, indicating specificity of the effect. The GPR30 agonist, G1 also exerted significant neuroprotection against GCI. E2-BSA and G1 also rapidly enhanced activation of the prosurvival kinases, Akt and ERK, while decreasing proapototic JNK activation. Importantly, AS knockdown of GPR30 markedly attenuated these rapid kinase signaling effects of E2-BSA. As a whole, the studies provide evidence of an important role of GPR30 in mediating the rapid signaling and neuroprotective actions of E2 in the hippocampus.
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Affiliation(s)
- Hui Tang
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA; Neurobiology Institute, Medical Research Center, Hebei United University, Tangshan 063000, China
| | - Quanguang Zhang
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA
| | - Licai Yang
- Neurobiology Institute, Medical Research Center, Hebei United University, Tangshan 063000, China
| | - Yan Dong
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA
| | - Mohammad Khan
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA
| | - Fang Yang
- Neurobiology Institute, Medical Research Center, Hebei United University, Tangshan 063000, China
| | - Darrell W Brann
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA.
| | - Ruimin Wang
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Georgia Regents University, 1120 15th Street, Augusta, GA 30912, USA; Neurobiology Institute, Medical Research Center, Hebei United University, Tangshan 063000, China.
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Lizcano F, Guzmán G. Estrogen Deficiency and the Origin of Obesity during Menopause. BIOMED RESEARCH INTERNATIONAL 2014; 2014:757461. [PMID: 24734243 PMCID: PMC3964739 DOI: 10.1155/2014/757461] [Citation(s) in RCA: 288] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Revised: 01/03/2014] [Accepted: 01/06/2014] [Indexed: 12/27/2022]
Abstract
Sex hormones strongly influence body fat distribution and adipocyte differentiation. Estrogens and testosterone differentially affect adipocyte physiology, but the importance of estrogens in the development of metabolic diseases during menopause is disputed. Estrogens and estrogen receptors regulate various aspects of glucose and lipid metabolism. Disturbances of this metabolic signal lead to the development of metabolic syndrome and a higher cardiovascular risk in women. The absence of estrogens is a clue factor in the onset of cardiovascular disease during the menopausal period, which is characterized by lipid profile variations and predominant abdominal fat accumulation. However, influence of the absence of these hormones and its relationship to higher obesity in women during menopause are not clear. This systematic review discusses of the role of estrogens and estrogen receptors in adipocyte differentiation, and its control by the central nervous systemn and the possible role of estrogen-like compounds and endocrine disruptors chemicals are discussed. Finally, the interaction between the decrease in estrogen secretion and the prevalence of obesity in menopausal women is examined. We will consider if the absence of estrogens have a significant effect of obesity in menopausal women.
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Affiliation(s)
- Fernando Lizcano
- Biomedical Research Center, Universidad de La Sabana (CIBUS), km 7, Autopista Norte de Bogota, Chia, Colombia ; Fundacion Cardio-Infantil Instituto de Cardiologia, Bogota, Colombia
| | - Guillermo Guzmán
- Biomedical Research Center, Universidad de La Sabana (CIBUS), km 7, Autopista Norte de Bogota, Chia, Colombia
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Abstract
Traditionally, steroid hormones such as the vitamin D3 metabolites, testosterone and dihydrotesterone, and 17β-estradiol act through cytosolic and nuclear receptors that directly interact with DNA to alter gene transcription and regulate cellular development. However, recent studies focused on rapid and membrane effects of steroid hormones have given invaluable insight into their non-classical mechanisms of action. In some cases, the traditional receptors were implicated as acting also in the plasma membrane as membrane-associated receptors. However, recent data have demonstrated the presence of an alternative splicing variant to traditional estrogen receptor α known as ERα36, which is present in the plasma membranes of several different cell types including several cancer cell types and even in some normal cells including cartilage and bone cells. The physiological effects that result from the membrane activation of ERα36 may vary from one cell type to another, but the mechanism of action appears to use similar pathways such as the activation of various protein kinases and phospholipases leading to the activation of signaling cascades that result in rapid, non-genomic responses. These rapid responses can affect cell proliferation and apoptotic signaling, indirectly activate downstream genomic signaling through phosphorylation cascades of transcription factors, and crosstalk with classical pathways via interaction with classical receptors. This review describes the data from the last several years and discusses the non-classical, rapid, and membrane-associated cellular responses to steroid hormones, particularly 17β-estradiol, through the classical receptors ERα and ERβ and various non-classical receptors, especially estrogen receptor-α36 (ERα36).
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Affiliation(s)
- Reyhaan A Chaudhri
- School of Biology, Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, 315 Ferst Drive NW, Atlanta, GA 30332, USA; Atlanta Clinical and Translational Science Institute, Emory University, 1440 Clifton Rd NE, Atlanta, GA 30322, USA
| | - Nofrat Schwartz
- Department of Otolaryngology, Meir Hospital, Tchernichovsky 59, Kfar Saba 44299, Israel
| | - Khairat Elbaradie
- School of Biology, Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, 315 Ferst Drive NW, Atlanta, GA 30332, USA; Department of Zoology, Tanta University, 69 Tout Ankh Amoon St, Tanta 31111, Egypt
| | - Zvi Schwartz
- School of Engineering, Virginia Commonwealth University, 601 West Main Street, Suite 331, Richmond, VA 23284, USA; Department of Periodontics, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, MSC 7894, San Antonio, TX 78229, USA
| | - Barbara D Boyan
- School of Biology, Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, 315 Ferst Drive NW, Atlanta, GA 30332, USA; School of Engineering, Virginia Commonwealth University, 601 West Main Street, Suite 331, Richmond, VA 23284, USA.
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Patani N, Martin LA. Understanding response and resistance to oestrogen deprivation in ER-positive breast cancer. Mol Cell Endocrinol 2014; 382:683-694. [PMID: 24121024 DOI: 10.1016/j.mce.2013.09.038] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 09/30/2013] [Accepted: 09/30/2013] [Indexed: 01/01/2023]
Abstract
Oestrogens (E) and oestrogen receptor alpha (ERα) play fundamental roles in the development and progression of more than three-quarters of breast cancers (BC). The ability to influence the natural history of BC by hormonal manipulation is well established and endocrine therapies represent the cornerstone of systemic management for women with ERα-positive disease. Endocrine agents abrogate oestrogenic signalling through distinct and incompletely overlapping mechanisms, either impeding the transcriptional activity of ERα or diminishing E-synthesis. In post-menopausal women, E-production is chiefly attributable to the enzymatic conversion of androgens in extra-gonadal tissues by the cytochrome P-450 superfamily member aromatase. Greater understanding of steroid biosynthesis has underpinned rational drug design and pharmacological development of potent and specific aromatase inhibitors (AIs). Contemporary agents induce profound E-suppression in post-menopausal women and are first-line neo-adjuvant, adjuvant and metastatic therapies, with greater efficacy and tolerability than tamoxifen. The principal qualifier for endocrine treatment, including AIs, remains ERα expression. However, it is increasingly apparent that ERα expression is not synonymous with sensitivity to treatment and insufficient to account for the considerable heterogeneity of response. Better predictive biomarkers of de novo resistance are required to improve patient selection and identify those poor-responders who may benefit from alternative or additional systemic treatment from the outset. Among patients who do respond well initially, many relapse during their clinical course and there is also an unmet need for biomarkers of acquired resistance. The majority of women who relapse on AIs continue to express functional ERα which remains a legitimate target for second-line endocrine therapy. Understanding and overcoming acquired resistance to AIs requires a greater appreciation of ERα biology and the mechanisms though which E-dependence can be subverted. In this article, we review the impact of therapeutic E-deprivation on the natural history of ERα-positive breast cancer. Consideration is given to established and emerging biomarkers and/or determinants of response and resistance to E-deprivation. In vitro and in vivo evidence of the molecular mechanisms underpinning the transition from sensitivity to resistance are reviewed in the context of current models of ERα activity and their potential translational relevance.
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Affiliation(s)
- N Patani
- Academic Department of Biochemistry, Royal Marsden Foundation Trust, London, UK; Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK
| | - L-A Martin
- Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, UK.
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Tagawa N, Kubota S, Kato I, Kobayashi Y. Resveratrol inhibits 11β-hydroxysteroid dehydrogenase type 1 activity in rat adipose microsomes. J Endocrinol 2013; 218:311-20. [PMID: 23814014 DOI: 10.1530/joe-13-0066] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
It has been suggested that resveratrol, a polyphenol in wine, can regulate adiposity because it decreases adipose deposition in mice and rats; however, the mechanism underlying this effect has not been fully clarified. In humans and rodents, 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) is expressed in liver and adipose tissue. 11β-HSD1 converts inactive glucocorticoid into active glucocorticoid in adipocytes. Activated glucocorticoid plays an important role in the pathogenesis of central obesity. The objective of this study was to investigate the effects of resveratrol on 11β-HSD1 activity in rodent adipose tissue. 11β-HSD1 activity in microsomes from rat mesenteric adipose depots and 3T3-L1 adipocytes was determined in the presence of 11-dehydrocorticosterone with or without varying concentrations of resveratrol. Significant inhibition of 11β-HSD1 by resveratrol was observed in rat adipose microsomes and 3T3-L1 adipocytes within 10 min. Time- and dose-dependent effects were also observed. The 11β-HSD1 activity by resveratrol was also inhibited in rat epididymal adipose tissue, and this inhibition was not recovered by estrogen receptor blockers. The kinetic study revealed that resveratrol acted as a non-competitive inhibitor of 11β-HSD1. Ki and IC50 values of resveratrol were 39.6 and 35.2 μM respectively. Further, resveratrol did not affect the activities of 11β-HSD2 and hexose-6-phosphate dehydrogenase. These results suggest that the most likely mechanism of 11β-HSD1 inhibition by resveratrol is via interaction between resveratrol and 11β-HSD1 enzyme, rather than via a transcriptional pathway. We demonstrated that the antiobesity effects of resveratrol may partially be attributed to the inhibition of 11β-HSD1 activity in adipocytes.
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Affiliation(s)
- Noriko Tagawa
- Department of Medical Biochemistry, Kobe Pharmaceutical University, 4-19-1 Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan.
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Garrido P, Morán J, Alonso A, González S, González C. 17β-estradiol activates glucose uptake via GLUT4 translocation and PI3K/Akt signaling pathway in MCF-7 cells. Endocrinology 2013; 154:1979-89. [PMID: 23546602 DOI: 10.1210/en.2012-1558] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The relationship between estrogen and some types of breast cancer has been clearly established. However, although several studies have demonstrated the relationship between estrogen and glucose uptake via phosphatidylinositol 3-kinase (PI3K)/Akt in other tissues, not too much is known about the possible cross talk between them for development and maintenance of breast cancer. This study was designed to test the rapid effects of 17β-estradiol (E2) or its membrane-impermeable form conjugated with BSA (E2BSA) on glucose uptake in a positive estrogen receptor (ER) breast cancer cell line, through the possible relationship between key components of the PI3K/Akt signaling pathway and acute steroid treatment. MCF-7 human breast cancer cells were cultured in standard conditions. Then 10 nM E2 or E2BSA conjugated were administered before obtaining the cell lysates. To study the glucose uptake, the glucose fluorescent analog 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-2-deoxy-d-glucose was used. We report an ER-dependent activation of some of the key steps of the PI3K/Akt signaling pathway cascade that leads cells to improve some mechanisms that finally increase glucose uptake capacity. Our data suggest that both E2 and E2BSA enhance the entrance of the fluorescent glucose analog 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-2-deoxy-d-glucose, and also activates PI3K/Akt signaling pathway, leading to translocation of glucose transporter 4 to the plasma membrane in an ERα-dependent manner. E2 enhances ER-dependent rapid signaling triggered, partially in the plasma membrane, allowing ERα-positive MCF-7 breast cancer cells to increase glucose uptake, which could be essential to meet the energy demands of the high rate of proliferation.
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Affiliation(s)
- Pablo Garrido
- Department of Functional Biology, Physiology Area, University of Oviedo, c/ Julian Claveria s/n, 33006, Oviedo, Spain
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Kampa M, Pelekanou V, Notas G, Stathopoulos EN, Castanas E. The estrogen receptor: two or more molecules, multiple variants, diverse localizations, signaling and functions. Are we undergoing a paradigm-shift as regards their significance in breast cancer? Hormones (Athens) 2013; 12:69-85. [PMID: 23624133 DOI: 10.1007/bf03401288] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Marilena Kampa
- Department of Experimental Endocrinology, University of Crete, School of Medicine, Heraklion, Crete, Greece
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Cao W, Ma Z, Rasenick MM, Yeh S, Yu J. N-3 poly-unsaturated fatty acids shift estrogen signaling to inhibit human breast cancer cell growth. PLoS One 2012; 7:e52838. [PMID: 23285198 PMCID: PMC3532062 DOI: 10.1371/journal.pone.0052838] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Accepted: 11/23/2012] [Indexed: 11/18/2022] Open
Abstract
Although evidence has shown the regulating effect of n-3 poly-unsaturated fatty acid (n-3 PUFA) on cell signaling transduction, it remains unknown whether n-3 PUFA treatment modulates estrogen signaling. The current study showed that docosahexaenoic acid (DHA, C22:6), eicosapentaenoic acid (EPA, C20:5) shifted the pro-survival and proliferative effect of estrogen to a pro-apoptotic effect in human breast cancer (BCa) MCF-7 and T47D cells. 17 β-estradiol (E2) enhanced the inhibitory effect of n-3 PUFAs on BCa cell growth. The IC50 of DHA or EPA in MCF-7 cells decreased when combined with E2 (10 nM) treatment (from 173 µM for DHA only to 113 µM for DHA+E2, and from 187 µm for EPA only to 130 µm for EPA+E2). E2 also augmented apoptosis in n-3 PUFA-treated BCa cells. In contrast, in cells treated with stearic acid (SA, C18:0) as well as cells not treated with fatty acid, E2 promoted breast cancer cell growth. Classical (nuclear) estrogen receptors may not be involved in the pro-apoptotic effects of E2 on the n-3 PUFA-treated BCa cells because ERα agonist failed to elicit, and ERα knockdown failed to block E2 pro-apoptotic effects. Subsequent studies reveal that G protein coupled estrogen receptor 1 (GPER1) may mediate the pro-apoptotic effect of estrogen. N-3 PUFA treatment initiated the pro-apoptotic signaling of estrogen by increasing GPER1-cAMP-PKA signaling response, and blunting EGFR, Erk 1/2, and AKT activity. These findings may not only provide the evidence to link n-3 PUFAs biologic effects and the pro-apoptotic signaling of estrogen in breast cancer cells, but also shed new insight into the potential application of n-3 PUFAs in BCa treatment.
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Affiliation(s)
- WenQing Cao
- Department of Pathology and Laboratory Medicine, George Whipple Laboratory for Cancer Research, University of Rochester Medical Center, Rochester, New York, United States of America
| | - ZhiFan Ma
- Department of Pathology and Laboratory Medicine, George Whipple Laboratory for Cancer Research, University of Rochester Medical Center, Rochester, New York, United States of America
- Department of Urology, First Hospital of Shanxi Medical University, Taiyuan, Shanxi, China
| | - Mark M. Rasenick
- Departments of Physiology and Biophysics and Psychiatry, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, United States of America
- Jesse Brown VA Medical Center, Chicago, Illinois, United States of America
| | - ShuYan Yeh
- Department of Pathology and Laboratory Medicine, George Whipple Laboratory for Cancer Research, University of Rochester Medical Center, Rochester, New York, United States of America
- Department of Urology, George Whipple Laboratory for Cancer Research, University of Rochester Medical Center, Rochester, New York, United States of America
| | - JiangZhou Yu
- Department of Pathology and Laboratory Medicine, George Whipple Laboratory for Cancer Research, University of Rochester Medical Center, Rochester, New York, United States of America
- * E-mail:
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Yun SP, Ryu JM, Kim MO, Park JH, Han HJ. Rapid actions of plasma membrane estrogen receptors regulate motility of mouse embryonic stem cells through a profilin-1/cofilin-1-directed kinase signaling pathway. Mol Endocrinol 2012; 26:1291-303. [PMID: 22734041 DOI: 10.1210/me.2012-1002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Long-term estrogen actions are vital for driving cell growth, but more recent evidence suggests that estrogen mediates more rapid cellular effects. However, the function of estradiol-17β (E(2))-BSA in mouse embryonic stem cells has not been reported. Therefore, we examined the role of E(2)-BSA in mouse embryonic stem cell motility and its related signal pathways. E(2)-BSA (10(-8) m) significantly increased motility after 24 h incubation and increased filamentous (F)-actin expression; these effects were inhibited by the estrogen receptor antagonist ICI 182,780, indicating that E(2)-BSA bound membrane estrogen receptors and initiated a signal. E(2)-BSA increased c-Src and focal adhesion kinase (FAK) phosphorylation, which was attenuated by ICI 182,780. The E(2)-BSA-induced increase in epidermal growth factor receptor (EGFR) phosphorylation was inhibited by Src inhibitor PP2. As a downstream signal molecule, E(2)-BSA activated cdc42 and increased formation of a complex with the neural Wiskott-Aldrich syndrome protein (N-WASP)/cdc42/transducer of cdc42-dependent actin assembly-1 (TOCA-1), which was inhibited by FAK small interfering RNA (siRNA) and EGFR inhibitor AG 1478. In addition, E(2)-BSA increased profilin-1 expression and cofilin-1 phosphorylation, which was blocked by cdc42 siRNA. Subsequently, E(2)-BSA induced an increase in F-actin expression, and cell motility was inhibited by each signal pathway-related siRNA molecule or inhibitors but not by cofilin-1 siRNA. A combined treatment of cofilin-1 siRNA and E(2)-BSA increased F-actin expression and cell motility more than that of E(2)-BSA alone. These data demonstrate that E(2)-BSA stimulated motility by interacting with profilin-1/cofilin-1 and F-actin through FAK- and c-Src/EGFR transactivation-dependent N-WASP/cdc42/TOCA-1 complex.
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Affiliation(s)
- Seung Pil Yun
- Department of Veterinary Physiology, College of Veterinary Medicine, Chonnam National University, Gwangju 500-757, Korea
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Russell NV, Ogaga-Mgbonyebi EV, Habteab B, Dunigan AI, Tesfay MA, Clancy AN. Sexual responses of the male rat medial preoptic area and medial amygdala to estrogen II: site specific effects of selective estrogenic drugs. Horm Behav 2012; 62:58-66. [PMID: 22565216 DOI: 10.1016/j.yhbeh.2012.04.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Revised: 04/01/2012] [Accepted: 04/28/2012] [Indexed: 11/25/2022]
Abstract
In the medial preoptic area (MPO) and medial amygdala (MEA), estradiol (E(2)) aromatized from testosterone (T) may act via either estrogen receptor (ER) α or ERβ to mediate mating in male rats. We tested the hypothesis that, in the MPO, ERα exclusively mediates sexual responses to E(2) by monitoring mating in four groups of castrated male rats administered dihydrotestosterone (DHT) subcutaneously and MPO implants delivering either: cholesterol, E(2), propyl pyrazole triol (PPT, ERα-agonist) or diarylpropionitrile (DPN, ER β-agonist); a fifth group of intact males served as DPN toxicity control, receiving DPN MPO implants. In a follow-up study, either 1-methyl-4-phenyl pyridinium (MPP, ERα-antagonist) or blank MPO cannulae were implanted in castrated male rats receiving T subcutaneously, whereas intact MPP toxicity controls received MPP MEA implants. PPT or E(2) MPO implants maintained mating, but cholesterol or DPN MPO implants did not. Moreover, MPP MPO implants interfered with T reinstatement of mating suggesting that, in the MPO, ERα is necessary and sufficient for mating in androgen-maintained male rats and ERβ is not sufficient. Because it is unknown which ER subtype(s) mediate sexual responses of the MEA to E(2), we examined mating following MEA implants of cholesterol, E(2), PPT or DPN in four groups of castrated male rats administered DHT subcutaneously. E(2) MEA implants maintained mounting but mating was significantly decreased in groups receiving PPT, DPN or cholesterol MEA implants suggesting that, unlike the MPO where ERα alone is essential, sexual responses of the MEA to E(2) require simultaneous interactions among multiple ER subtypes.
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Affiliation(s)
- Nancy V Russell
- Department of Biology, Georgia State University, Atlanta, GA 30302‐4010, USA
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Gutiérrez S, Sosa LDV, Petiti JP, Mukdsi JH, Mascanfroni ID, Pellizas CG, De Paul AL, Cambiasso MJ, Torres AI. 17β-Estradiol stimulates the translocation of endogenous estrogen receptor α at the plasma membrane of normal anterior pituitary cells. Mol Cell Endocrinol 2012; 355:169-79. [PMID: 22366173 DOI: 10.1016/j.mce.2012.02.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Revised: 02/03/2012] [Accepted: 02/07/2012] [Indexed: 11/21/2022]
Abstract
In the present work we aimed at identifying ERα in the plasma membrane of normal anterior pituitary cells and investigated if 17β-estradiol was able to induce their subcellular redistribution. Our results show that about 8% of anterior pituitary cells expressed ERα in the plasma membrane, with the geometrical mean fluorescence intensity being increased after steroid hormone treatment. 17β-Estradiol and the selective ERα agonist PPT induced an increase of ERα expression in the plasma membrane and activated the PKCα/ERK 1/2 pathway in a time-course not compatible with genomic actions, thus supporting the notion of membrane-initiated effects. These findings suggest that 17β-estradiol stimulates the translocation of endogenous ERα to the plasma membrane, consequently modulating this ER pool and leading to cellular biological effects in normal anterior pituitary gland.
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Affiliation(s)
- Silvina Gutiérrez
- Centro de Microscopía Electrónica, Universidad Nacional de Córdoba, Haya de la Torre esq, Enrique Barros, Ciudad Universitaria, CP 5000 Córdoba, Argentina.
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Abstract
17β-Oestradiol (E(2)) is an important hormone signal that regulates multiple tissues and functions in the body. This review focuses on the neuroprotective actions of E(2) in the brain against cerebral ischaemia and the potential underlying mechanisms. A particular focus of the review will be on the role of E(2) to attenuate NADPH oxidase activation, superoxide and reactive oxygen species generation and reduce oxidative stress in the ischaemic brain as a potentially key neuroprotective mechanism. Evidence of a potential novel role of extranuclear oestrogen receptors in mediating E(2) signalling and neuroprotective actions is also discussed. An additional subject is the growing evidence indicating that periods of long-term oestrogen deprivation, such as those occurring after menopause or surgical menopause, may lead to loss or attenuation of E(2) signalling and neuroprotective actions in the brain, as well as enhanced sensitivity of the hippocampus to ischaemic stress damage. These findings have important implications with respect to the 'critical period hypothesis', which proposes that oestrogen replacement must be initiated at peri-menopause in humans to exert its beneficial cardiovascular and neural effects. The insights gained from these various studies will prove valuable for guiding future directions in the field.
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Affiliation(s)
- Darrell Brann
- Institute of Molecular Medicine and Genetics, Georgia Health Sciences University Augusta, GA USA 30912
- Corresponding author: Dr. Darrell W. Brann, Institute of Molecular Medicine and Genetics, Georgia Health Sciences University, 1120 15th Street, Augusta, GA 30912, USA, Phone: 706-721-7771,
| | - Limor Raz
- Institute of Molecular Medicine and Genetics, Georgia Health Sciences University Augusta, GA USA 30912
| | - Ruimin Wang
- Hebei United University, Experimental and Research Center, Hebei United University, 57 South Jian-she Road, Tangshan, Hebei, 063600, PR China
| | - Ratna Vadlamudi
- Department of Obstetrics & Gynecology, University of Texas Health Science Center at San Antonio, Floyd Curl Drive, San Antonio TX 78229
| | - Quanguang Zhang
- Institute of Molecular Medicine and Genetics, Georgia Health Sciences University Augusta, GA USA 30912
- Co-Corresponding author: Dr. Quanguang Zhang, Institute of Molecular Medicine and Genetics, Georgia Health Sciences University, 1120 15th Street, Augusta, GA 30912, USA, Phone: 706-721-7771,
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Bodhankar S, Offner H. GPR30 FORMS AN INTEGRAL PART OF E2-PROTECTIVE PATHWAY IN EXPERIMENTAL AUTOIMMUNE ENCEPHALOMYELITIS. ACTA ACUST UNITED AC 2011; 11:262-274. [PMID: 22247749 DOI: 10.2174/1871522211108040262] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A major focus of our laboratory has been an in-depth evaluation as to how estrogens exert a pronounced protective effect on clinical and histological disease in the animal model of multiple sclerosis (MS), experimental autoimmune encephalomyelitis (EAE). An important issue regarding their therapeutic application has been the undesirable estrogenic side effects thought to be mediated primarily through 17β-estradiol (E2) binding to intracellular estrogen receptor alpha (ERα). With the discovery and characterization of GPR30 as the putative membrane estrogen receptor, we sought to study whether signaling through GPR30 was sufficient to mediate protection against EAE without engagement of ERα. Treatment of EAE in WT mice with G-1, a selective GPR30 agonist, retained estradiol's ability to protect against clinical and histological EAE without estrogenic side effects. G-1 treatment deviated cytokine profiles and enhanced suppressive activity of CD4(+)Foxp3(+) Treg cells through a GPR30- and programmed death 1 (PD-1)-dependent mechanism. This novel finding was indicative of the protective effect of GPR30 activation in EAE and provides a strong foundation for the clinical application of GPR30 agonists such as G-1 in MS. However, future studies are needed to elucidate cross-signaling and evaluate possible additive effects of combined signaling through both GPR30 and ER-α. Deciphering the possible mechanism of involvement of GPR30 in estrogen-mediated protection against EAE may result in lowering treatment doses of E2 and GPR30 agonists that could minimize risks and maximize immunoregulation and therapeutic effects in MS. Alternatively, one might envision using E2 derivatives with reduced estrogenic activity alone or in combination with GPR30 agonists as therapies for both male and female MS patients.
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Affiliation(s)
- Sheetal Bodhankar
- Neuroimmunology Research, Portland VA Medical Center, Portland, OR, USA
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Lucas TF, Pimenta MT, Pisolato R, Lazari MFM, Porto CS. 17β-estradiol signaling and regulation of Sertoli cell function. SPERMATOGENESIS 2011; 1:318-324. [PMID: 22332115 DOI: 10.4161/spmg.1.4.18903] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 10/23/2011] [Accepted: 10/27/2011] [Indexed: 02/07/2023]
Abstract
In this review, we will present an overview of estrogen actions in the testis from immature and adult animals, with special emphasis on signaling mechanisms involved in the 17β-estradiol regulation of Sertoli cell function in immature rats. 17β-estradiol activates Sertoli cell proliferation in immature rats by a mechanism that involves the translocation of the estrogen receptors ESR1 and ESR2 to the plasma membrane, phosphorylation of epidermal growth factor receptor and activation of mitogen-activated protein kinase 3/1. Activation of the G protein-coupled estrogen receptor (GPER) also induces phosphorylation of mitogen-activated protein kinase 3/1 via epidermal growth factor receptor transactivation, which in turn increases expression of the antiapoptotic protein BCL2 and decreases the expression of proapoptotic protein BAX, indicating an antiapoptotic role of E2-GPER in immature rat Sertoli cells. In conclusion, ESRs and GPER can mediate rapid 17β-estradiol signaling in Sertoli cells, and modulate transcriptional events important for Sertoli cell function and maintenance of normal testis development and homeostasis. Our findings are important to clarify the role of estrogen in a critical period of testicular development and to direct further studies, which may contribute to better understand the causes of male infertility.
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Affiliation(s)
- Thaís Fg Lucas
- Section of Experimental Endocrinology; Department of Pharmacology; Escola Paulista de Medicina; Universidade Federal de São Paulo; São Paulo, Brazil
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Nongenomic glucocorticoid receptor action regulates gap junction intercellular communication and neural progenitor cell proliferation. Proc Natl Acad Sci U S A 2011; 108:16657-62. [PMID: 21930911 DOI: 10.1073/pnas.1102821108] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Glucocorticoids (GCs) are used to treat pregnant women at risk for preterm delivery; however, prenatal exposure to GCs may trigger adverse neurological side effects due to reduced neural progenitor cell (NPC) proliferation. Whereas many established cell-cycle regulators impact NPC proliferation, other signaling molecules, such as the gap junction protein connexin-43 (Cx43), also influence proliferation. Gap junction intercellular communication (GJIC) is influenced by GCs in some cells, but such hormone effects have not been examined in coupled stem cells. We found that both continuous and transient exposure of embryonic day 14.5 mouse neurosphere cultures to dexamethasone (DEX) limits proliferation of coupled NPCs, which is manifested by both a reduction in S-phase progression and enhanced cell-cycle exit. A short (i.e., 1-h) DEX treatment also reduced GJIC as measured by live-cell fluorescence recovery after photobleaching, and altered the synchrony of spontaneous calcium transients in coupled NPCs. GC effects on GJIC in NPCs are transcription-independent and mediated through plasma membrane glucocorticoid receptors (GRs). This nongenomic pathway operates through lipid raft-associated GRs via a site-specific, MAPK-dependent phosphorylation of Cx43, which is linked to GR via caveolin-1 (Cav-1) and c-src. Cav-1 is essential for this nongenomic action of GR, as DEX effects on GJIC, Cx43 phosphorylation, and MAPK activation are not observed in Cav-1 knockout NPCs. As transient pharmacologic inhibition of GJIC triggers reduced S-phase progression but not enhanced cell-cycle exit, the nongenomic GR signaling pathway may operate via distinct downstream effectors to alter the proliferative capacity of NPCs.
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Liu J, Youn H, Yang J, Du N, Liu J, Liu H, Li B. G-protein alpha-s and -12 subunits are involved in androgen-stimulated PI3K activation and androgen receptor transactivation in prostate cancer cells. Prostate 2011; 71:1276-86. [PMID: 21308712 PMCID: PMC3143312 DOI: 10.1002/pros.21345] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2010] [Accepted: 12/21/2010] [Indexed: 11/10/2022]
Abstract
BACKGROUND The androgen receptor (AR) is a ligand-dependent transcription factor that mediates androgenic hormone action in cells. We recently demonstrated the involvement of phosphoinositide 3-OH kinase (PI3K) p110beta in AR transactivation and gene expression. In this study, we determined the upstream signals that lead to PI3K/p110beta activation and AR transactivation after androgen stimulation. METHODS Human prostate cancer LAPC-4 and 22Rv1 cell lines were used for the experiments. AR transactivation was assessed using an androgen responsive element-driven luciferase (ARE-LUC) assay. Cell proliferation was examined using BrdU incorporation and MTT assays. Target genes were silenced using small interfering RNA (siRNA) approach. Gene expression was evaluated at the mRNA level (real-time RT-PCR) and protein level (Western blot). PI3K kinase activities were measured using immunoprecipitation-based in vitro kinase assay. The AR-DNA-binding activity was determined using chromatin-immunoprecipitation (ChIP) assay. RESULTS First, at the cellular plasma membrane, disrupting the integrity of caveolae microdomain with methyl-β-cyclodextrin (M-β-CD) abolished androgen-induced AR transactivation and gene expression. Then, knocking down caveolae structural proteins caveolin-1 or -2 with the gene-specific siRNAs significantly reduced androgen-induced AR transactivation. Next, silencing Gα(s) and Gα(12) genes but not other G-proteins blocked androgen-induced AR transactivation and cell proliferation. Consistently, overexpression of Gα(s) or Gα(12) active mutants enhanced androgen-induced AR transactivation, of which Gα(s) active mutant sensitized the AR to castration-level of androgen (R1881). Most interestingly, knocking down Gα(s) but not Gα(12) subunit significantly suppressed androgen-stimulated PI3K p110beta activation. However, ChIP analysis revealed that both Gα(s) or Gα(12) subunits are involved in androgen-induced AR interaction with the AR target gene PSA promoter region. CONCLUSION These data suggest that caveolae-associated G-protein alpha subunits are involved in AR transactivation by modulating the activities of different PI3K isoforms.
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Affiliation(s)
- Jianjun Liu
- Department of Urology, the Affiliated Hospital of Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Hyewon Youn
- Institute of Radiation Medicine and Department of Nuclear Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea
- Departments of Urology, the University of Kansas Medical Center, Kansas City, Kansas 66160
| | - Jun Yang
- Departments of Urology, the University of Kansas Medical Center, Kansas City, Kansas 66160
- Department of Urology, Tongji Hospital, Huazhong University of Science & Technology, Wuhan, Hubei 430030, China
| | - Ningchao Du
- Department of Urology, the Affiliated Hospital of Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Jihong Liu
- Departments of Urology, the University of Kansas Medical Center, Kansas City, Kansas 66160
| | - Hongwei Liu
- Department of Urology, the Affiliated Hospital of Guangdong Medical College, Zhanjiang, Guangdong 524001, China
| | - Benyi Li
- Department of Urology, the Affiliated Hospital of Guangdong Medical College, Zhanjiang, Guangdong 524001, China
- Departments of Urology, the University of Kansas Medical Center, Kansas City, Kansas 66160
- Corresponding Author: Benyi Li, MD/PhD, KUMC Urology, 3901 Rainbow Blvd, Kansas City, KS 66160. Tel: 913-588-4773; Fax: 913-588-4756;
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Abstract
One segment of the population that is particularly inclined to liver fat accumulation is postmenopausal women. Although nonalcoholic hepatic steatosis is more common in men than in women, after menopause there is a reversal in gender distribution. At the present time, weight loss and exercise are regarded as first line treatments for NAFLD in postmenopausal women, as it is the case for the management of metabolic syndrome. In recent years, there has been substantial evidence coming mostly from the use of the animal model, that indeed estrogens withdrawal is associated with modifications of molecular markers favouring the activity of metabolic pathways ultimately leading to liver fat accumulation. In addition, the use of the animal model has provided physiological and molecular evidence that exercise training provides estrogens-like protective effects on liver fat accumulation and its consequences. The purpose of the present paper is to present information relative to the development of a state of NAFLD resulting from the absence of estrogens and the role of exercise training, emphasizing on the contribution of the animal model on these issues.
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NAFLD, Estrogens, and Physical Exercise: The Animal Model. J Nutr Metab 2011; 2012:914938. [PMID: 21845221 PMCID: PMC3154523 DOI: 10.1155/2012/914938] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Accepted: 06/05/2011] [Indexed: 12/17/2022] Open
Abstract
One segment of the population that is particularly inclined to liver fat accumulation is postmenopausal women. Although nonalcoholic hepatic steatosis is more common in men than in women, after menopause there is a reversal in gender distribution. At the present time, weight loss and exercise are regarded as first line treatments for NAFLD in postmenopausal women, as it is the case for the management of metabolic syndrome. In recent years, there has been substantial evidence coming mostly from the use of the animal model, that indeed estrogens withdrawal is associated with modifications of molecular markers favouring the activity of metabolic pathways ultimately leading to liver fat accumulation. In addition, the use of the animal model has provided physiological and molecular evidence that exercise training provides estrogens-like protective effects on liver fat accumulation and its consequences. The purpose of the present paper is to present information relative to the development of a state of NAFLD resulting from the absence of estrogens and the role of exercise training, emphasizing on the contribution of the animal model on these issues.
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Boonyaratanakornkit V. Scaffolding proteins mediating membrane-initiated extra-nuclear actions of estrogen receptor. Steroids 2011; 76:877-84. [PMID: 21354435 DOI: 10.1016/j.steroids.2011.02.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 01/14/2011] [Accepted: 02/16/2011] [Indexed: 12/30/2022]
Abstract
Estrogen mediates biological effects on cell proliferation, differentiation, and homeostasis through estrogen receptor (ER). In addition to functioning as a ligand-activated nuclear transcription factor to directly regulate gene transcription, ER also mediates rapid activation of signaling pathways independent of its transcriptional activity. A subpopulation of ER localized to the cell membrane or cytoplasm has been proposed to mediate ER activation of signaling pathways. This review focuses on recent advances in our understanding of mechanisms responsible for ER cytoplasm/membrane localization, where rapid extra-nuclear signaling is initiated. These mechanisms include lipid modification of the receptor (palmitoylation) and interactions with membrane and cytoplasmic adaptor proteins including caveolins, striatin, p130Cas, Shc, HPIP, MTA-1s, and MNAR/PELP1. While it is clear that ER mediates rapid extra-nuclear signaling resulting in activation of signaling pathways such as Src/MAPK and PI-3 kinase/Akt, how ER extra-nuclear signaling influences overall ER/estrogen physiology is still not well understood. Future studies defining physiological roles of ER extra-nuclear actions and crosstalk with its nuclear counterparts will be important to our overall understanding of estrogen and ER biological functions.
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Affiliation(s)
- Viroj Boonyaratanakornkit
- Department of Molecular and Cellular Biology, Baylor College of Medicine, One Baylor Plaza, MS-130, Houston, TX 77030, USA.
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Pighon A, Gutkowska J, Jankowski M, Rabasa-Lhoret R, Lavoie JM. Exercise training in ovariectomized rats stimulates estrogenic-like effects on expression of genes involved in lipid accumulation and subclinical inflammation in liver. Metabolism 2011; 60:629-39. [PMID: 20674948 DOI: 10.1016/j.metabol.2010.06.012] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Revised: 05/12/2010] [Accepted: 06/14/2010] [Indexed: 02/06/2023]
Abstract
We hypothesized that the reduction in liver fat accumulation known to occur with exercise training in ovariectomized (Ovx) rats is associated with reduced expression of genes involved in lipogenesis while favoring the expression of transcription factors regulating lipid oxidation. We also tested the hypothesis that liver fat accumulation in Ovx rats is associated with an increased gene expression of several inflammatory biomarkers and that exercise training would attenuate this response. Sprague-Dawley female rats (14 weeks of age) were randomly divided into 4 groups of sedentary sham-operated (Sham), Ovx, Ovx with 17β-estradiol (E2) supplementation using a pellet (0.72 mg; 0.012 mg/d) with a biodegradable carrier binder, and Ovx trained with endurance exercise. Endurance exercise training consisted of continuous running on a motor-driven rodent treadmill 5 times per week for 5 weeks. Fat accumulation in liver as well as in adipose fat depots was higher (P < .01) in Ovx than in Sham rats. This response was prevented in Ovx animals with 17β-estradiol supplementation and with endurance exercise training. Liver gene expressions of sterol regulatory element-binding protein 1-c, stearoyl coenzyme A desaturase 1 (and its protein content), carbohydrate response element binding protein, and acetyl-coenzyme A carboxylase were increased with estrogen withdrawal (P < .01). These responses were corrected with E2 supplementation alone as well as with training alone. Conversely, hepatic peroxisome proliferator-activated receptor α messenger RNA levels were lower (P < .01) after estrogen removal compared with Sham rats. The lower hepatic peroxisome proliferator-activated receptor α messenger RNA levels in Ovx rats were reincreased by E2 replacement or by exercise training. Gene expression of proinflammatory cytokines including inhibitor-κB kinase β and interleukin-6, as well as protein content of nuclear factor-κB, was higher (P < .01) in Ovx than in Sham animals. E2 supplementation or exercise training prevented the expression of the proinflammatory markers. It is concluded that exercise training reduces fat accumulation in liver of Ovx rats possibly through regulation of key molecules involved in lipogenesis and lipid oxidation. Exercise training also acts as estrogens in properly regulating the expression of inflammatory biomarkers in liver of Ovx rats.
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Affiliation(s)
- Abdolnaser Pighon
- Department of Kinesiology, Université de Montréal, Montreal, Quebec, Canada.
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Popolo A, Piccinelli AL, Morello S, Sorrentino R, Osmany CR, Rastrelli L, Aldo P. Cytotoxic activity of nemorosone in human MCF-7 breast cancer cells. Can J Physiol Pharmacol 2011; 89:50-7. [DOI: 10.1139/y10-100] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Estrogen receptor (ER) antagonists have been widely used for breast cancer treatment; however, patients have increasingly shown resistance and sensitivity to the high toxicity of these drugs, and identification of novel targeted therapies is therefore required. To determine whether nemorosone, a polycyclic polyisoprenylated benzophenone isolated from floral resins of Clusia rosea Jacq. and Cuban propolis samples, exerts anticancer effects on human breast cancer cells, estrogen receptor positive (ERα+) MCF-7 and estrogen receptor negative (ERα–) MDA-MB-231 and LNCaP cells were used. Cells were treated with nemorosone alone or in association with 17β-estradiol (E2) or an ER antagonist, ICI 182,780, a selective ER downregulator that completely abrogates estrogen-sensitive gene transcription. Nemorosone inhibited the cell viability of ERα+ but not of ERα– cells. In MCF-7, nemorosone induced inhibition of cell growth by blocking the cell cycle in the G0/G1 phase. Moreover, the expression of pERK1/2 and pAkt, considered to be hallmarks of the nongenomic estrogen signalling pathway, were reduced in MCF-7 cells treated with nemorosone. All these effects were enhanced by ICI 182,780. However, nemorosone was not able to interfere with E2-induced Ca2+ release. These findings suggest that nemorosone may have therapeutic application in the treatment of breast cancer because of its activity on ERα.
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Affiliation(s)
- Ada Popolo
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Salerno, via Ponte Don Melillo, Fisciano (SA), Italy
- Instituto de Farmacia y Alimentos (IFAL), Universidad de La Habana, Avenida 23, 21425 La Lisa, Ciudad de La Habana, Cuba
| | - Anna Lisa Piccinelli
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Salerno, via Ponte Don Melillo, Fisciano (SA), Italy
- Instituto de Farmacia y Alimentos (IFAL), Universidad de La Habana, Avenida 23, 21425 La Lisa, Ciudad de La Habana, Cuba
| | - Silvana Morello
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Salerno, via Ponte Don Melillo, Fisciano (SA), Italy
- Instituto de Farmacia y Alimentos (IFAL), Universidad de La Habana, Avenida 23, 21425 La Lisa, Ciudad de La Habana, Cuba
| | - Rosalinda Sorrentino
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Salerno, via Ponte Don Melillo, Fisciano (SA), Italy
- Instituto de Farmacia y Alimentos (IFAL), Universidad de La Habana, Avenida 23, 21425 La Lisa, Ciudad de La Habana, Cuba
| | - Cuesta Rubio Osmany
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Salerno, via Ponte Don Melillo, Fisciano (SA), Italy
- Instituto de Farmacia y Alimentos (IFAL), Universidad de La Habana, Avenida 23, 21425 La Lisa, Ciudad de La Habana, Cuba
| | - Luca Rastrelli
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Salerno, via Ponte Don Melillo, Fisciano (SA), Italy
- Instituto de Farmacia y Alimentos (IFAL), Universidad de La Habana, Avenida 23, 21425 La Lisa, Ciudad de La Habana, Cuba
| | - Pinto Aldo
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Salerno, via Ponte Don Melillo, Fisciano (SA), Italy
- Instituto de Farmacia y Alimentos (IFAL), Universidad de La Habana, Avenida 23, 21425 La Lisa, Ciudad de La Habana, Cuba
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Estradiol rapidly regulates membrane estrogen receptor alpha levels in hypothalamic neurons. J Neurosci 2010; 30:12589-96. [PMID: 20861365 DOI: 10.1523/jneurosci.1038-10.2010] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Estrogen receptors (ERs) and estrogen-binding proteins have been localized intracellularly and on the cell surface. The membrane-associated proteins initiate signaling that activates a myriad of cellular responses including the modulation of ion channels and ultimately transcription. Although many of the downstream actions of membrane ERs, including ERα and ERβ, have been characterized, the mechanisms regulating membrane ER levels have remained elusive in the nervous system. In the present study, we used surface biotinylation to identify and study the estradiol regulation of membrane ERα in mixed-sex, cultured hypothalamic neurons from rat. Following surface biotinylation, Western blot analysis revealed full-length 66 kDa ERα and several ERα splice variants, most notably a biotinylated 52 kDa ERα-immunoreactive protein. Treatment of the neurons with estradiol caused a rapid and transient increase of the biotinylated 52 kDa and 66 kDa ERα proteins in the plasma membrane. Exposure of the neurons to estradiol also significantly increased internalization of 52 kDa and 66 kDa ERα membrane proteins, a measure of receptor activation. In the hypothalamus, membrane ERα signaling depends on transactivation of metabotropic glutamate receptor-1a (mGluR1a). Estradiol treatment increased the internalization of mGluR1a in parallel with ERα, a finding consistent with the hypothesis of an ERα-mGluR1a signaling unit. These results demonstrate that estradiol regulates the amount of ERα in the membrane, suggesting estradiol can regulate its own membrane signaling.
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Yang LC, Zhang QG, Zhou CF, Yang F, Zhang YD, Wang RM, Brann DW. Extranuclear estrogen receptors mediate the neuroprotective effects of estrogen in the rat hippocampus. PLoS One 2010; 5:e9851. [PMID: 20479872 PMCID: PMC2866326 DOI: 10.1371/journal.pone.0009851] [Citation(s) in RCA: 138] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Accepted: 03/04/2010] [Indexed: 11/26/2022] Open
Abstract
Background 17β-estradiol (E2) has been implicated to exert neuroprotective effects in the brain following cerebral ischemia. Classically, E2 is thought to exert its effects via genomic signaling mediated by interaction with nuclear estrogen receptors. However, the role and contribution of extranuclear estrogen receptors (ER) is unclear and was the subject of the current study. Methodology/Principal Findings To accomplish this goal, we employed two E2 conjugates (E2 dendrimer, EDC, and E2-BSA) that can interact with extranuclear ER and exert rapid nongenomic signaling, but lack the ability to interact with nuclear ER due to their inability to enter the nucleus. EDC or E2-BSA (10 µM) was injected icv 60 min prior to global cerebral ischemia (GCI). FITC-tagged EDC or E2-BSA revealed high uptake in the hippocampal CA1 region after icv injection, with a membrane (extranuclear) localization pattern in cells. Both EDC and E2-BSA exerted robust neuroprotection in the CA1 against GCI, and the effect was blocked by the ER antagonist, ICI182,780. EDC and E2-BSA both rapidly enhanced activation of the prosurvival kinases, ERK and Akt, while attenuating activation of the proapoptotic kinase, JNK following GCI, effects that were blocked by ICI182,780. Administration of an MEK or PI3K inhibitor blocked the neuroprotective effects of EDC and E2-BSA. Further studies showed that EDC increased p-CREB and BDNF in the CA1 region in an ERK- and Akt-dependent manner, and that cognitive outcome after GCI was preserved by EDC in an ER-dependent manner. Conclusions/Significance In conclusion, the current study demonstrates that activation of extranuclear ER results in induction of ERK-Akt-CREB-BDNF signaling in the hippocampal CA1 region, which significantly reduces ischemic neuronal injury and preserves cognitive function following GCI. The study adds to a growing literature that suggests that extranuclear ER can have important actions in the brain.
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Affiliation(s)
- Li-cai Yang
- Experimental and Research Center, North China Coal Medical University, Tangshan, Hebei, People's Republic of China
| | - Quan-Guang Zhang
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Augusta, Georgia, United States of America
| | - Cai-feng Zhou
- Experimental and Research Center, North China Coal Medical University, Tangshan, Hebei, People's Republic of China
| | - Fang Yang
- Experimental and Research Center, North China Coal Medical University, Tangshan, Hebei, People's Republic of China
| | - Yi-dong Zhang
- Experimental and Research Center, North China Coal Medical University, Tangshan, Hebei, People's Republic of China
| | - Rui-min Wang
- Experimental and Research Center, North China Coal Medical University, Tangshan, Hebei, People's Republic of China
- * E-mail: (RMW); (DWB)
| | - Darrell W. Brann
- Institute of Molecular Medicine and Genetics, Medical College of Georgia, Augusta, Georgia, United States of America
- * E-mail: (RMW); (DWB)
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Bonnet S, Paulin R, Sutendra G, Dromparis P, Roy M, Watson KO, Nagendran J, Haromy A, Dyck JRB, Michelakis ED. Dehydroepiandrosterone reverses systemic vascular remodeling through the inhibition of the Akt/GSK3-{beta}/NFAT axis. Circulation 2009; 120:1231-40. [PMID: 19752325 DOI: 10.1161/circulationaha.109.848911] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND The remodeled vessel wall in many vascular diseases such as restenosis after injury is characterized by proliferative and apoptosis-resistant vascular smooth muscle cells. There is evidence that proproliferative and antiapoptotic states are characterized by a metabolic (glycolytic phenotype and hyperpolarized mitochondria) and electric (downregulation and inhibition of plasmalemmal K(+) channels) remodeling that involves activation of the Akt pathway. Dehydroepiandrosterone (DHEA) is a naturally occurring and clinically used steroid known to inhibit the Akt axis in cancer. We hypothesized that DHEA will prevent and reverse the remodeling that follows vascular injury. METHODS AND RESULTS We used cultured human carotid vascular smooth muscle cell and saphenous vein grafts in tissue culture, stimulated by platelet-derived growth factor to induce proliferation in vitro and the rat carotid injury model in vivo. DHEA decreased proliferation and increased vascular smooth muscle cell apoptosis in vitro and in vivo, reducing vascular remodeling while sparing healthy tissues after oral intake. Using pharmacological (agonists and antagonists of Akt and its downstream target glycogen-synthase-kinase-3beta [GSK-3beta]) and molecular (forced expression of constitutively active Akt1) approaches, we showed that the effects of DHEA were mediated by inhibition of Akt and subsequent activation of GSK-3beta, leading to mitochondrial depolarization, increased reactive oxygen species, activation of redox-sensitive plasmalemmal voltage-gated K(+) channels, and decreased [Ca(2+)](i). These functional changes were accompanied by sustained molecular effects toward the same direction; by decreasing [Ca(2+)](i) and inhibiting GSK-3beta, DHEA inhibited the nuclear factor of activated T cells transcription factor, thus increasing expression of Kv channels (Kv1.5) and contributing to sustained mitochondrial depolarization. These results were independent of any steroid-related effects because they were not altered by androgen and estrogen inhibitors but involved a membrane G protein-coupled receptor. CONCLUSIONS We suggest that the orally available DHEA might be an attractive candidate for the treatment of systemic vascular remodeling, including restenosis, and we propose a novel mechanism of action for this important hormone and drug.
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Affiliation(s)
- Sébastien Bonnet
- Centre de Recherche de L'Hôtel-Dieu de Québec, 9 Rue McMahon, Québec, Qc, G1R 2J6, Canada.
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Micevych P, Dominguez R. Membrane estradiol signaling in the brain. Front Neuroendocrinol 2009; 30:315-27. [PMID: 19416735 PMCID: PMC2720427 DOI: 10.1016/j.yfrne.2009.04.011] [Citation(s) in RCA: 134] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Revised: 04/22/2009] [Accepted: 04/23/2009] [Indexed: 12/16/2022]
Abstract
While the physiology of membrane-initiated estradiol signaling in the nervous system has remained elusive, a great deal of progress has been made toward understanding the activation of cell signaling. Membrane-initiated estradiol signaling activates G proteins and their downstream cascades, but the identity of membrane receptors and the proximal signaling mechanism(s) have been more difficult to elucidate. Mounting evidence suggests that classical intracellular estrogen receptor-alpha (ERalpha) and ERbeta are trafficked to the membrane to mediate estradiol cell signaling. Moreover, an interaction of membrane ERalpha and ERbeta with metabotropic glutamate receptors has been identified that explains the pleomorphic actions of membrane-initiated estradiol signaling. This review focuses on the mechanism of actions initiated by membrane estradiol receptors and discusses the role of scaffold proteins and signaling cascades involved in the regulation of nociception, sexual receptivity and the synthesis of neuroprogesterone, an important component in the central nervous system signaling.
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Affiliation(s)
- Paul Micevych
- Department of Neurobiology and the Laboratory of Neuroendocrinology David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1763, USA.
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Lebesgue D, Chevaleyre V, Zukin RS, Etgen AM. Estradiol rescues neurons from global ischemia-induced cell death: multiple cellular pathways of neuroprotection. Steroids 2009; 74:555-61. [PMID: 19428444 PMCID: PMC3029071 DOI: 10.1016/j.steroids.2009.01.003] [Citation(s) in RCA: 167] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Revised: 01/08/2009] [Accepted: 01/08/2009] [Indexed: 02/03/2023]
Abstract
The potential neuroprotective role of sex hormones in chronic neurodegenerative disorders and acute brain ischemia following cardiac arrest and stroke is of a great therapeutic interest. Long-term pretreatment with estradiol and other estrogens affords robust neuroprotection in male and female rodents subjected to focal and global ischemia. However, the receptors (e.g., cell surface or nuclear), intracellular signaling pathways and networks of estrogen-regulated genes that intervene in neuronal apoptosis are as yet unclear. We have shown that estradiol administered at physiological levels for two weeks before ischemia rescues neurons destined to die in the hippocampal CA1 and ameliorates ischemia-induced cognitive deficits in ovariectomized female rats. This regimen of estradiol treatment involves classical intracellular estrogen receptors, transactivation of IGF-1 receptors and stimulation of the ERK/MAPK signaling pathway, which in turn maintains CREB activity in the ischemic CA1. We also find that a single, acute injection of estradiol administrated into the brain ventricle immediately after an ischemic event reduces both neuronal death and cognitive deficits. Because these findings suggest that hormones could be used to treat patients when given after brain ischemia, it is critical to determine whether the same or different pathways mediate this form of neuroprotection. We find that an agonist of the membrane estrogen receptor GPR30 mimics short latency estradiol facilitation of synaptic transmission in the hippocampus. Therefore, we are testing the hypothesis that GPR30 may act together with intracellular estrogen receptors to activate cell signaling pathways to promote neuron survival after global ischemia.
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Affiliation(s)
- Diane Lebesgue
- Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
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50
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Nierth-Simpson EN, Martin MM, Chiang TC, Melnik LI, Rhodes LV, Muir SE, Burow ME, McLachlan JA. Human uterine smooth muscle and leiomyoma cells differ in their rapid 17beta-estradiol signaling: implications for proliferation. Endocrinology 2009; 150:2436-45. [PMID: 19179429 PMCID: PMC2671893 DOI: 10.1210/en.2008-0224] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Uterine leiomyomas, benign uterine smooth muscle tumors that affect 30% of reproductive-aged women, are a significant health concern. The initiation event for these tumors is unclear, but 17beta-estradiol (E2) is an established promoter of leiomyoma growth. E2 not only alters transcription of E2-regulated genes but also can rapidly activate signaling pathways. The aim of our study is to investigate the role of rapid E2-activated cytoplasmic signaling events in the promotion of leiomyomas. Western blot analysis revealed that E2 rapidly increases levels of phosphorylated protein kinase C alpha (PKC alpha) in both immortalized uterine smooth muscle (UtSM) and leiomyoma (UtLM) cell lines, but increases levels of phosphorylated ERK1/2 only in UtLM cells. Our studies demonstrate a paradoxical effect of molecular and pharmacological inhibition of PKC alpha on ERK1/2 activation and cellular proliferation in UtLM and UtSM cells. PKC alpha inhibition decreases levels of phosphorylated ERK1/2 and proliferation in UtLM cells but raises these levels in UtSM cells. cAMP-PKA signaling is rapidly activated only in UtSM cells with E2 and inhibits ERK1/2 activation and proliferation. We therefore propose a model whereby E2's rapid activation of PKC alpha and cAMP-PKA signaling plays a central role in the maintenance of a low proliferative index in normal uterine smooth muscle via its inhibition of the MAPK cascade and these pathways are altered in leiomyomas to promote MAPK activation and proliferation. These studies demonstrate that rapid E2-signaling pathways contribute to the promotion of leiomyomas.
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