1
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Koebele SV, Bernaud VE, Northup-Smith SN, Willeman MN, Strouse IM, Bulen HL, Schrier AR, Newbern JM, DeNardo DF, Mayer LP, Dyer CA, Bimonte-Nelson HA. Gynecological surgery in adulthood imparts cognitive and brain changes in rats: A focus on hysterectomy at short-, moderate-, and long-term intervals after surgery. Horm Behav 2023; 155:105411. [PMID: 37659358 PMCID: PMC11060888 DOI: 10.1016/j.yhbeh.2023.105411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 07/11/2023] [Accepted: 08/08/2023] [Indexed: 09/04/2023]
Abstract
Premenopausal hysterectomy is associated with a greater relative risk of dementia. We previously demonstrated cognitive impairments in adult rats six weeks after hysterectomy with ovarian conservation compared with intact sham-controls and other gynecological surgery variations. Here, we investigated whether hysterectomy-induced cognitive impairments are transient or persistent. Adult rats received sham-control, ovariectomy (Ovx), hysterectomy, or Ovx-hysterectomy surgery. Spatial working memory, reference memory, and anxiety-like behavior were tested either six-weeks post-surgery, in adulthood; seven-months post-surgery, in early middle-age; or twelve-months post-surgery, in late middle-age. Hysterectomy in adulthood yielded spatial working memory deficits at short-, moderate-, and long-term post-surgery intervals. Serum hormone levels did not differ between ovary-intact, but differed from Ovx, groups. Hysterectomy had no significant impact on healthy ovarian follicle or corpora lutea counts for any post-surgery timepoint compared with intact sham-controls. Frontal cortex, dorsal hippocampus, and entorhinal cortex were assessed for activity-dependent markers. In entorhinal cortex, there were alterations in FOSB and ΔFOSB expression during the early middle-age timepoint, and phosphorylated ERK1/2 levels at the adult timepoint. Collectively, results suggest a primary role for the uterus in regulating cognition, and that memory-related neural pathways may be modified following gynecological surgery. This is the first preclinical report of long-term effects of hysterectomy with and without ovarian conservation on cognition, endocrine, ovarian, and brain assessments, initiating a comprehensive framework of gynecological surgery effects. Translationally, findings underscore critical needs to decipher how gynecological surgeries, especially those involving the uterus, impact the brain and its functions, the ovaries, and overall aging from a systems perspective.
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Affiliation(s)
- Stephanie V Koebele
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, 4745 N 7th St, Phoenix, AZ 85014, USA
| | - Victoria E Bernaud
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, 4745 N 7th St, Phoenix, AZ 85014, USA
| | - Steven N Northup-Smith
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, 4745 N 7th St, Phoenix, AZ 85014, USA
| | - Mari N Willeman
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, 4745 N 7th St, Phoenix, AZ 85014, USA
| | - Isabel M Strouse
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, 4745 N 7th St, Phoenix, AZ 85014, USA
| | - Haidyn L Bulen
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, 4745 N 7th St, Phoenix, AZ 85014, USA
| | - Ally R Schrier
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, 4745 N 7th St, Phoenix, AZ 85014, USA
| | - Jason M Newbern
- School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA
| | - Dale F DeNardo
- School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA
| | | | | | - Heather A Bimonte-Nelson
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, 4745 N 7th St, Phoenix, AZ 85014, USA.
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2
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Daniel JM, Lindsey SH, Mostany R, Schrader LA, Zsombok A. Cardiometabolic health, menopausal estrogen therapy and the brain: How effects of estrogens diverge in healthy and unhealthy preclinical models of aging. Front Neuroendocrinol 2023; 70:101068. [PMID: 37061205 PMCID: PMC10725785 DOI: 10.1016/j.yfrne.2023.101068] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/23/2023] [Accepted: 04/10/2023] [Indexed: 04/17/2023]
Abstract
Research in preclinical models indicates that estrogens are neuroprotective and positively impact cognitive aging. However, clinical data are equivocal as to the benefits of menopausal estrogen therapy to the brain and cognition. Pre-existing cardiometabolic disease may modulate mechanisms by which estrogens act, potentially reducing or reversing protections they provide against cognitive decline. In the current review we propose mechanisms by which cardiometabolic disease may alter estrogen effects, including both alterations in actions directly on brain memory systems and actions on cardiometabolic systems, which in turn impact brain memory systems. Consideration of mechanisms by which estrogen administration can exert differential effects dependent upon health phenotype is consistent with the move towards precision or personalized medicine, which aims to determine which treatment interventions will work for which individuals. Understanding effects of estrogens in both healthy and unhealthy models of aging is critical to optimizing the translational link between preclinical and clinical research.
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Affiliation(s)
- Jill M Daniel
- Department of Psychology and Brain Institute, Tulane University, New Orleans, LA, United States.
| | - Sarah H Lindsey
- Department of Pharmacology and Brain Institute, Tulane University, New Orleans, LA, United States
| | - Ricardo Mostany
- Department of Pharmacology and Brain Institute, Tulane University, New Orleans, LA, United States
| | - Laura A Schrader
- Department of Cell & Molecular Biology and Brain Institute, Tulane University, New Orleans, LA, United States
| | - Andrea Zsombok
- Department of Physiology and Brain Institute, Tulane University, New Orleans, LA, United States
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3
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Adlanmerini M, Fontaine C, Gourdy P, Arnal JF, Lenfant F. Segregation of nuclear and membrane-initiated actions of estrogen receptor using genetically modified animals and pharmacological tools. Mol Cell Endocrinol 2022; 539:111467. [PMID: 34626731 DOI: 10.1016/j.mce.2021.111467] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/06/2021] [Accepted: 09/28/2021] [Indexed: 11/23/2022]
Abstract
Estrogen receptor alpha (ERα) and beta (ERβ) are members of the nuclear receptor superfamily, playing widespread functions in reproductive and non-reproductive tissues. Beside the canonical function of ERs as nuclear receptors, in this review, we summarize our current understanding of extra-nuclear, membrane-initiated functions of ERs with a specific focus on ERα. Over the last decade, in vivo evidence has accumulated to demonstrate the physiological relevance of this ERα membrane-initiated-signaling from mouse models to selective pharmacological tools. Finally, we discuss the perspectives and future challenges opened by the integration of extra-nuclear ERα signaling in physiology and pathology of estrogens.
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Affiliation(s)
- Marine Adlanmerini
- I2MC, Institut National de la Santé et de la Recherche Médicale (INSERM) U1297, Université de Toulouse 3 and CHU de Toulouse, Toulouse, France
| | - Coralie Fontaine
- I2MC, Institut National de la Santé et de la Recherche Médicale (INSERM) U1297, Université de Toulouse 3 and CHU de Toulouse, Toulouse, France
| | - Pierre Gourdy
- I2MC, Institut National de la Santé et de la Recherche Médicale (INSERM) U1297, Université de Toulouse 3 and CHU de Toulouse, Toulouse, France
| | - Jean-François Arnal
- I2MC, Institut National de la Santé et de la Recherche Médicale (INSERM) U1297, Université de Toulouse 3 and CHU de Toulouse, Toulouse, France
| | - Françoise Lenfant
- I2MC, Institut National de la Santé et de la Recherche Médicale (INSERM) U1297, Université de Toulouse 3 and CHU de Toulouse, Toulouse, France.
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4
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Zeibich L, Koebele SV, Bernaud VE, Ilhan ZE, Dirks B, Northup-Smith SN, Neeley R, Maldonado J, Nirmalkar K, Files JA, Mayer AP, Bimonte-Nelson HA, Krajmalnik-Brown R. Surgical Menopause and Estrogen Therapy Modulate the Gut Microbiota, Obesity Markers, and Spatial Memory in Rats. Front Cell Infect Microbiol 2021; 11:702628. [PMID: 34660336 PMCID: PMC8515187 DOI: 10.3389/fcimb.2021.702628] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 08/24/2021] [Indexed: 02/06/2023] Open
Abstract
Menopause in human females and subsequent ovarian hormone deficiency, particularly concerning 17β-estradiol (E2), increase the risk for metabolic dysfunctions associated with obesity, diabetes type 2, cardiovascular diseases, and dementia. Several studies indicate that these disorders are also strongly associated with compositional changes in the intestinal microbiota; however, how E2 deficiency and hormone therapy affect the gut microbial community is not well understood. Using a rat model, we aimed to evaluate how ovariectomy (OVX) and subsequent E2 administration drive changes in metabolic health and the gut microbial community, as well as potential associations with learning and memory. Findings indicated that OVX-induced ovarian hormone deficiency and E2 treatment had significant impacts on several health-affecting parameters, including (a) the abundance of some intestinal bacterial taxa (e.g., Bifidobacteriaceae and Porphyromonadaceae), (b) the abundance of microbial short-chain fatty acids (SCFAs) (e.g., isobutyrate), (c) weight/BMI, and (d) high-demand spatial working memory following surgical menopause. Furthermore, exploratory correlations among intestinal bacteria abundance, cognition, and BMI underscored the putative influence of surgical menopause and E2 administration on gut-brain interactions. Collectively, this study showed that surgical menopause is associated with physiological and behavioral changes, and that E2-linked compositional changes in the intestinal microbiota might contribute to some of its related negative health consequences. Overall, this study provides novel insights into interactions among endocrine and gastrointestinal systems in the post-menopausal life stage that collectively alter the risk for the development and progression of cardiovascular, metabolic, and dementia-related diseases.
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Affiliation(s)
- Lydia Zeibich
- Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, United States
| | - Stephanie V Koebele
- Department of Psychology, Arizona State University, Tempe, AZ, United States.,Arizona Alzheimer's Consortium, Phoenix, AZ, United States
| | - Victoria E Bernaud
- Department of Psychology, Arizona State University, Tempe, AZ, United States.,Arizona Alzheimer's Consortium, Phoenix, AZ, United States
| | - Zehra Esra Ilhan
- Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, United States
| | - Blake Dirks
- Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, United States
| | - Steven N Northup-Smith
- Department of Psychology, Arizona State University, Tempe, AZ, United States.,Arizona Alzheimer's Consortium, Phoenix, AZ, United States
| | - Rachel Neeley
- Department of Psychology, Arizona State University, Tempe, AZ, United States.,Arizona Alzheimer's Consortium, Phoenix, AZ, United States
| | - Juan Maldonado
- Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, United States.,Genomics Core, Arizona State University, Tempe, AZ, United States
| | - Khemlal Nirmalkar
- Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, United States
| | - Julia A Files
- Division of Women's Health Internal Medicine, Mayo Clinic, Scottsdale, AZ, United States
| | - Anita P Mayer
- Division of Women's Health Internal Medicine, Mayo Clinic, Scottsdale, AZ, United States
| | - Heather A Bimonte-Nelson
- Department of Psychology, Arizona State University, Tempe, AZ, United States.,Arizona Alzheimer's Consortium, Phoenix, AZ, United States
| | - Rosa Krajmalnik-Brown
- Biodesign Center for Health Through Microbiomes, Arizona State University, Tempe, AZ, United States
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5
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Baumgartner NE, Black KL, McQuillen SM, Daniel JM. Previous estradiol treatment during midlife maintains transcriptional regulation of memory-related proteins by ERα in the hippocampus in a rat model of menopause. Neurobiol Aging 2021; 105:365-373. [PMID: 34198140 PMCID: PMC8338908 DOI: 10.1016/j.neurobiolaging.2021.05.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 05/27/2021] [Accepted: 05/30/2021] [Indexed: 10/21/2022]
Abstract
Previous midlife estradiol treatment, like continuous treatment, improves memory and results in lasting increases in hippocampal levels of estrogen receptor (ER) α and ER-dependent transcription in ovariectomized rodents. We hypothesized that previous and continuous midlife estradiol act to specifically increase levels of nuclear ERα, resulting in transcriptional regulation of proteins that mediate estrogen effects on memory. Ovariectomized middle-aged rats received estradiol or vehicle capsule implants. After 40 days, rats initially receiving vehicle received another vehicle capsule (ovariectomized controls). Rats initially receiving estradiol received either another estradiol (continuous estradiol) or a vehicle (previous estradiol) capsule. One month later, hippocampi were dissected and processed. Continuous and previous estradiol increased levels of nuclear, but not membrane or cytosolic ERα and had no effect on Esr1. Continuous and previous estradiol impacted gene expression and/or protein levels of mediators of estrogenic action on memory including ChAT, BDNF, and PSD-95. Findings demonstrate a long-lasting role for hippocampal ERα as a transcriptional regulator of memory following termination of previous estradiol treatment in a rat model of menopause.
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Affiliation(s)
- Nina E Baumgartner
- Brain Institute, Tulane University, New Orleans, LA; Neuroscience Program, Tulane University, New Orleans, LA.
| | - Katelyn L Black
- Brain Institute, Tulane University, New Orleans, LA; Neuroscience Program, Tulane University, New Orleans, LA
| | - Shannon M McQuillen
- Brain Institute, Tulane University, New Orleans, LA; Neuroscience Program, Tulane University, New Orleans, LA
| | - Jill M Daniel
- Brain Institute, Tulane University, New Orleans, LA; Neuroscience Program, Tulane University, New Orleans, LA; Psychology Department, Tulane University, New Orleans, LA
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6
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Sinha P, Rani A, Kumar A, Riva A, Brant JO, Foster TC. Examination of CA1 Hippocampal DNA Methylation as a Mechanism for Closing of Estrogen's Critical Window. Front Aging Neurosci 2021; 13:717032. [PMID: 34421577 PMCID: PMC8371553 DOI: 10.3389/fnagi.2021.717032] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 07/15/2021] [Indexed: 02/01/2023] Open
Abstract
There is a critical window for estrogen replacement therapy, beyond which estradiol (E2) fails to enhance cognition and N-methyl-D-aspartate (NMDA) receptor function, and E2-responsive transcription decreases. Much less attention has been given to the mechanism for closing of the critical window, which is thought to involve the decline in estrogen signaling cascades, possibly involving epigenetic mechanisms, including DNA methylation. This study investigated changes in DNA methylation in region CA1 of the hippocampus of ovariectomized female rats over the course of brain aging and in response to E2-treatment, using whole genome bisulfite sequencing. Differential methylation of CpG and non-CpG (CHG and CHH) sites and associated genes were characterized in aged controls (AC), middle-age controls (MC), and young controls (YC) and differential methylation in response to E2-treatment (T) was examined in each age group (AT-AC, MT-MC, and YT-YC). Possible candidate genes for the closing of the critical window were defined as those that were hypomethylated by E2-treatment in younger animals, but were unresponsive in aged animals. Gene ontology categories for possible critical window genes were linked to response to hormones (Adcyap1, Agtr2, Apob, Ahr, Andpro, Calm2, Cyp4a2, Htr1b, Nr3c2, Pitx2, Pth, Pdk4, Slc2a2, Tnc, and Wnt5a), including G-protein receptor signaling (Gpr22 and Rgs4). Other possible critical window genes were linked to glutamate synapses (Nedd4, Grm1, Grm7, and Grin3a). These results suggest that decreased E2 signaling with advanced age, and/or prolonged E2 deprivation, results in methylation of E2-responsive genes, including those involved in rapid E2 signaling, which may limit subsequent transcription.
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Affiliation(s)
- Puja Sinha
- Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, United States
| | - Asha Rani
- Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, United States
| | - Ashok Kumar
- Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, United States
| | - Alberto Riva
- Bioinformatics Core, Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, United States
| | - Jason Orr Brant
- Department of Biostatistics, University of Florida, Gainesville, FL, United States
| | - Thomas C Foster
- Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, United States.,Genetics and Genomics Program, University of Florida, Gainesville, FL, United States
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7
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Baumgartner NE, Daniel JM. Estrogen receptor α: a critical role in successful female cognitive aging. Climacteric 2021; 24:333-339. [PMID: 33522313 DOI: 10.1080/13697137.2021.1875426] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Due to potential health risks, current recommendations are that individuals who wish to use hormone therapy to treat menopausal symptoms do so for the shortest period of time possible. In our investigation into how short-term use of estrogens in midlife following loss of ovarian function exerts long-term effects on female cognitive aging in rodents, we discovered a link between the ability of previous exposure to estradiol to enhance memory in the long term and its ability to increase estrogen receptor α (ERα) levels in the hippocampus, a brain area important for memory. Follow-up studies in model systems implicate a role for ERα in enhanced cognitive function independent of ovarian or exogenously administered estrogens. Results are consistent with clinical studies in which brain ERα levels in older women and men are related to cognitive functioning and risk of cognitive decline is associated with polymorphisms in the gene that transcribes ERα. Research in preclinical models reveals mechanisms through which ERα can be activated and affect cognition in the absence of ovarian estrogens, including ligand-independent activation via insulin-like growth factor-1 signaling and activation by brain-derived neuroestrogens. This report reviews preclinical and clinical data that collectively point to the importance of ERα in cognition and highlights the need to differentiate the role of estrogen receptors from their classical ligands as we seek approaches to facilitate successful cognitive aging.
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Affiliation(s)
- N E Baumgartner
- Neuroscience Program, Tulane University, New Orleans, LA, USA.,Brain Institute, Tulane University, New Orleans, LA, USA
| | - J M Daniel
- Neuroscience Program, Tulane University, New Orleans, LA, USA.,Brain Institute, Tulane University, New Orleans, LA, USA.,Department of Psychology, Tulane University, New Orleans, LA, USA
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8
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Koebele SV, Mennenga SE, Poisson ML, Hewitt LT, Patel S, Mayer LP, Dyer CA, Bimonte-Nelson HA. Characterizing the effects of tonic 17β-estradiol administration on spatial learning and memory in the follicle-deplete middle-aged female rat. Horm Behav 2020; 126:104854. [PMID: 32949557 PMCID: PMC8032560 DOI: 10.1016/j.yhbeh.2020.104854] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 09/09/2020] [Accepted: 09/10/2020] [Indexed: 01/19/2023]
Abstract
17β-estradiol (E2)-containing hormone therapy is a safe, effective way to alleviate unwanted menopause symptoms. Preclinical research has focused upon the role of E2 in learning and memory using a surgically menopausal rodent model whereby the ovaries are removed. Given that most women retain their reproductive tract and undergo a natural menopause transition, it is necessary to understand how exogenous E2 impacts a structurally intact, but follicle-deplete, system. In the current study, 8 month old female rats were administered the ovatoxin 4-vinylcyclohexene diepoxide (VCD), which accelerates ovarian follicular depletion, to model the human menopause transition. After follicular depletion, at 11 months old, rats were administered Vehicle or tonic E2 treatment for 12 days prior to behavioral evaluation on spatial working and reference memory tasks. Results demonstrated that E2 had both enhancing and impairing effects on taxed working memory depending upon the learning or retention phases of the water radial-arm maze, with no impact on reference memory. Relationships between memory scores and circulating estrogen levels were specific to follicle-depleted rats without E2 treatment. Collectively, findings demonstrate the complexity of E2 administration in a follicle-depleted background, with cognitive effects specific to working memory; furthermore, E2 administration altered circulating hormonal milieu and relationships between hormone profiles and memory. In sum, menopausal etiology impacts the parameters of E2 effects on cognition, complementing prior work with other estrogen compounds. Deciphering estrogenic actions in a system wherein the reproductive tract remains intact with follicle-depleted ovaries, thus modeling the majority or menopausal women, is critical for translational perspectives.
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Affiliation(s)
- Stephanie V Koebele
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, United States of America
| | - Sarah E Mennenga
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, United States of America
| | - Mallori L Poisson
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, United States of America
| | - Lauren T Hewitt
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, United States of America
| | - Shruti Patel
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, United States of America
| | | | - Cheryl A Dyer
- FYXX Foundation, Flagstaff, AZ, United States of America
| | - Heather A Bimonte-Nelson
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, United States of America.
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9
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Taxier LR, Gross KS, Frick KM. Oestradiol as a neuromodulator of learning and memory. Nat Rev Neurosci 2020; 21:535-550. [PMID: 32879508 PMCID: PMC8302223 DOI: 10.1038/s41583-020-0362-7] [Citation(s) in RCA: 95] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/31/2020] [Indexed: 12/24/2022]
Abstract
Although hormones such as glucocorticoids have been broadly accepted in recent decades as general neuromodulators of memory processes, sex steroid hormones such as the potent oestrogen 17β-oestradiol have been less well recognized by the scientific community in this capacity. The predominance of females in studies of oestradiol and memory and the general (but erroneous) perception that oestrogens are 'female' hormones have probably prevented oestradiol from being more widely considered as a key memory modulator in both sexes. Indeed, although considerable evidence supports a crucial role for oestradiol in regulating learning and memory in females, a growing body of literature indicates a similar role in males. This Review discusses the mechanisms of oestradiol signalling and provides an overview of the effects of oestradiol on spatial, object recognition, social and fear memories. Although the primary focus is on data collected in females, effects of oestradiol on memory in males will be discussed, as will sex differences in the molecular mechanisms that regulate oestrogenic modulation of memory, which may have important implications for the development of future cognitive therapeutics.
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Affiliation(s)
- Lisa R Taxier
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI, USA
| | - Kellie S Gross
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI, USA
| | - Karyn M Frick
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI, USA.
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10
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Abstract
17β-Estradiol (E2) is a potent steroid hormone of both gonadal and neuronal origin that exerts profound effects on neuroplasticity in several brain regions. Dendritic spine and synapse formation and rearrangements are modulated and mediated by estrogens. In this chapter, we highlighted the essential background concerning the effects of E2 on synaptic rearrangements accompanied by synaptic plasticity in E2-sensitive brain regions that mediate learning and memory, i.e., cortex and hippocampus. We also address details of the molecular mechanisms underlying E2 regulation of spine dynamics. The proposed models of action of E2 overlaps with that for well-established synaptic modulators, such as adenosine. Thus, the possible synergistic effects of those two molecules in respect to synaptic rearrangement and plasticity were presented.
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11
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Koebele SV, Nishimura KJ, Bimonte-Nelson HA, Kemmou S, Ortiz JB, Judd JM, Conrad CD. A long-term cyclic plus tonic regimen of 17β-estradiol improves the ability to handle a high spatial working memory load in ovariectomized middle-aged female rats. Horm Behav 2020; 118:104656. [PMID: 31862208 PMCID: PMC7286486 DOI: 10.1016/j.yhbeh.2019.104656] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 12/11/2019] [Accepted: 12/12/2019] [Indexed: 01/30/2023]
Abstract
The influence of estrogens on modifying cognition has been extensively studied, revealing that a wide array of factors can significantly impact cognition, including, but not limited to, subject age, estrogen exposure duration, administration mode, estrogen formulation, stress history, and progestogen presence. Less known is whether long-term, extended exposure to estrogens would benefit or otherwise impact cognition. The present study examined the effects of 17β-estradiol (E2) exposure for seven months, beginning in late adulthood and continuing into middle age, using a regimen of cyclic exposure (bi-monthly subcutaneous injection of 10 μg E2), or Cyclic+Tonic exposure (bi-monthly subcutaneous injection of 10 μg E2 + Silastic capsules of E2) in ovariectomized female Fischer-344-CDF rats. Subjects were tested on a battery of learning and memory tasks. All groups learned the water radial-arm maze (WRAM) and Morris water maze tasks in a similar fashion, regardless of hormone treatment regimen. In the asymptotic phase of the WRAM, rats administered a Cyclic+Tonic E2 regimen showed enhanced performance when working memory was taxed compared to Vehicle and Cyclic E2 groups. Assessment of spatial memory on object placement and object recognition was not possible due to insufficient exploration of objects; however, the Cyclic+Tonic group showed increased total time spent exploring all objects compared to Vehicle-treated animals. Overall, these data demonstrate that long-term Cyclic+Tonic E2 exposure can result in some long-term cognitive benefits, at least in the spatial working memory domain, in a surgically menopausal rat model.
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Affiliation(s)
- Stephanie V Koebele
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America; Arizona Alzheimer's Consortium, Phoenix, AZ, United States of America
| | - Kenji J Nishimura
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America
| | - Heather A Bimonte-Nelson
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America; Arizona Alzheimer's Consortium, Phoenix, AZ, United States of America
| | - Salma Kemmou
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America
| | - J Bryce Ortiz
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America
| | - Jessica M Judd
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America
| | - Cheryl D Conrad
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States of America.
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12
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Baumgartner NE, Grissom EM, Pollard KJ, McQuillen SM, Daniel JM. Neuroestrogen-Dependent Transcriptional Activity in the Brains of ERE-Luciferase Reporter Mice following Short- and Long-Term Ovariectomy. eNeuro 2019; 6:ENEURO.0275-19.2019. [PMID: 31575604 PMCID: PMC6795557 DOI: 10.1523/eneuro.0275-19.2019] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 09/03/2019] [Accepted: 09/22/2019] [Indexed: 12/22/2022] Open
Abstract
Previous work has demonstrated that estrogen receptors are transcriptionally active in the absence of ovarian estrogens. The current work aims to determine whether brain-derived estrogens influence estrogen receptor-dependent transcription after short- or long-term loss of ovarian function. Experiments were conducted using estrogen response element (ERE)-Luciferase reporter mice, which express the gene for luciferase driven by consensus ERE, allowing for the quantification of ERE-dependent transcription. Brain regions examined were hippocampus, cortex, and hypothalamus. In Experiment 1, short-term (10 d) ovariectomy had no impact on ERE-dependent transcription across brain regions compared with sham surgery. In Experiment 2, chronic intracerebroventricular administration of the aromatase inhibitor letrozole significantly decreased transcriptional activity in 10-d-old ovariectomized mice across brain regions, indicating that the sustained transcription in short-term ovariectomized mice is mediated at least in part via actions of neuroestrogens. Additionally, intracerebroventricular administration of estrogen receptor antagonist ICI-182,780 blocked transcription in 10-d-old ovariectomized mice across brain regions, providing evidence that sustained transcription in ovariectomized mice is estrogen receptor dependent. In Experiment 3, long-term (70 d) ovariectomy significantly decreased ERE-dependent transcription across brain regions, though some residual activity remained. In Experiment 4, chronic intracerebroventricular letrozole administration had no impact on transcription in 70 d ovariectomized mice across brain regions, indicating that the residual ERE-dependent transcription in long-term ovariectomized mice is not mediated by neuroestrogens. Overall, the results indicate that ERE-dependent transcription in the brain continues after ovariectomy and that the actions of neuroestrogens contribute to the maintenance of ERE-dependent transcription in the brain following short-term, but not long-term, loss of ovarian function.
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Affiliation(s)
| | - Elin M Grissom
- Neuroscience Program
- Department of Psychology, Tulane University, New Orleans, Louisiana 70118
| | | | | | - Jill M Daniel
- Neuroscience Program
- Tulane Brain Institute
- Department of Psychology, Tulane University, New Orleans, Louisiana 70118
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13
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Hayward GC, LeBlanc PJ, Emter CA, Nyarko JNK, Mousseau DD, MacPherson REK, Olver TD. Female Sex Hormones and Cardiac Pressure Overload Independently Contribute to the Cardiogenic Dementia Profile in Yucatan Miniature Swine. Front Cardiovasc Med 2019; 6:129. [PMID: 31552273 PMCID: PMC6746895 DOI: 10.3389/fcvm.2019.00129] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 08/19/2019] [Indexed: 01/29/2023] Open
Abstract
Post-menopausal women with heart failure (HF) frequently exhibit cardiogenic dementia. Using a pre-clinical swine model of post-menopausal HF, we recently demonstrated that experimental menopause (ovariectomy; OVX) and HF (6-month cardiac pressure overload/aortic banding; AB) independently altered cerebral vasomotor control and together impaired cognitive function. The purpose of this study was to examine the prefrontal cortex and hippocampus tissues from these animals to assess whether OVX and HF are associated with neurologic alterations that may contribute to cardiogenic dementia. We hypothesized that OVX and HF would independently alter neuronal cell signaling in swine with post-menopausal cardiogenic dementia. Immunoblot analyses revealed OVX was associated with reduced estrogen receptor-α in both brain regions and HF tended to exacerbate OVX-induced deficits in the hippocampus. Further, OVX was associated with a reduction in the ratio of phosphorylated:total Akt and ERK in the hippocampus as well as decreased total Akt and synaptophysin in the prefrontal cortex. In contrast, HF was associated with a trend toward reduced phosphorylated:total ERK in the prefrontal cortex. In addition, HF was associated with decreased β-amyloid (1-38) in the prefrontal cortex and increased β-amyloid (1-38) in the hippocampus. Regional brain lipid analysis revealed OVX tended to increase total, saturated, and monounsaturated fatty acid content in the prefrontal cortex, with the greatest magnitude of change occurring in the AB-OVX group. The data from this study suggest that OVX and HF are independently associated with regional-specific neurologic changes in the brain that contribute to the cardiogenic dementia profile in this model. This pre-clinical swine model may be a useful tool for better understanding post-menopausal cardiogenic dementia pathology and developing novel therapies.
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Affiliation(s)
- Grant C. Hayward
- Department of Health Sciences, Brock University, St. Catharines, ON, Canada
- Centre for Neuroscience, Brock University, St. Catharines, ON, Canada
| | - Paul J. LeBlanc
- Department of Health Sciences, Brock University, St. Catharines, ON, Canada
- Centre for Bone and Muscle Health, Brock University, St. Catharines, ON, Canada
| | - Craig A. Emter
- Department of Biomedical Sciences, University of Missouri, Columbia, MO, United States
| | - Jennifer N. K. Nyarko
- Department of Psychiatry, College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Darrell D. Mousseau
- Department of Psychiatry, College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Rebecca E. K. MacPherson
- Department of Health Sciences, Brock University, St. Catharines, ON, Canada
- Centre for Neuroscience, Brock University, St. Catharines, ON, Canada
| | - T. Dylan Olver
- Department of Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
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14
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Pollard KJ, Daniel JM. Nuclear estrogen receptor activation by insulin-like growth factor-1 in Neuro-2A neuroblastoma cells requires endogenous estrogen synthesis and is mediated by mutually repressive MAPK and PI3K cascades. Mol Cell Endocrinol 2019; 490:68-79. [PMID: 30986444 PMCID: PMC6520186 DOI: 10.1016/j.mce.2019.04.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 04/10/2019] [Accepted: 04/10/2019] [Indexed: 02/01/2023]
Abstract
Non-canonical mechanisms of estrogen receptor activation may continue to support women's cognitive health long after cessation of ovarian function. These mechanisms of estrogen receptor activation may include ligand-dependent actions via locally synthesized neuroestrogens and ligand-independent actions via growth factor-dependent activation of intracellular kinase cascades. We tested the hypothesis that ligand-dependent and ligand-independent mechanisms interact to activate nuclear estrogen receptors in the Neuro-2A neuroblastoma cell line in the absence of exogenous estrogens. Transcriptional output of estrogen receptors was measured following treatment with insulin-like growth factor-1 (IGF-1) in the presence of specific inhibitors for mitogen-activated protein kinase (MAPK), phosphoinositde-3 kinase (PI3K), and neuroestrogen synthesis. Results indicate that IGF-1-dependent activation of nuclear estrogen receptors is mediated by MAPK, is opposed PI3K, and requires concomitant endogenous neuroestrogen synthesis. We conclude that both cellular signaling context and endogenous ligand availability are important modulators of ligand-independent nuclear estrogen receptor activation.
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Affiliation(s)
- Kevin J Pollard
- Tulane Brain Institute, Tulane University, 200 Flower Hall, New Orleans, LA, 70118, USA; Neuroscience Program, Tulane University, 200 Flower Hall, New Orleans, LA, 70118, USA.
| | - Jill M Daniel
- Tulane Brain Institute, Tulane University, 200 Flower Hall, New Orleans, LA, 70118, USA; Neuroscience Program, Tulane University, 200 Flower Hall, New Orleans, LA, 70118, USA; Department of Psychology, Tulane University, 2007 Percival Stern Hall, New Orleans, LA, 70118, USA
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15
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Liu L, Yan J, Ge F, Xu X, Lu J, Shi H, Li S, Zhao Y, Zhang C. Saikosaponin‑D improves fear memory deficits in ovariectomized rats via the action of estrogen receptor‑α in the hippocampus. Mol Med Rep 2019; 20:332-340. [PMID: 31115535 DOI: 10.3892/mmr.2019.10232] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Accepted: 04/25/2019] [Indexed: 11/06/2022] Open
Abstract
Saikosaponin‑D (SSD), which is the main bioactive component in the traditional Chinese medicine Chai Hu (Bupleurum falcatum L), possesses estrogen‑like properties and is widely used in treating estrogen‑related neurological disorders. The current study aimed to investigate the protective effects of SSD on the fear memory deficit in ovariectomized (OVX) rats and the potential underlying mechanism. SSD treatment significantly prolonged freezing time in OVX rats in a manner similar to that of estradiol (E2), whereas this effect was markedly suppressed by co‑administration of ICI182780, a non‑selective estrogen receptor (ER) inhibitor. The expression of ERα in the hippocampus of OVX rats was significantly elevated by SSD; however, Erβ expression and E2 synthesis were not markedly affected by SSD treatment. Collectively, this study demonstrated that SSD‑mediated fear memory improvement in OVX rats may be attributed not to E2 levels or ERβ activity, but to ERα activation in the hippocampus.
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Affiliation(s)
- Lina Liu
- Department of Hepatology, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Jing Yan
- Key Laboratory for Metabolic Diseases in Chinese Medicine, First Clinical Medical College, Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210023, P.R. China
| | - Fei Ge
- Department of Gastroenterology, Haian Hospital of Traditional Chinese Medicine Affiliated to Nanjing University of Chinese Medicine, Haian, Jiangsu 226600, P.R. China
| | - Xiangtao Xu
- Department of Hepatology, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Jun Lu
- Department of Hepatology, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Huilian Shi
- Department of Hepatology, The Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210029, P.R. China
| | - Shuihong Li
- Department of Psychiatry and Imageology, Central People's Hospital of Zhanjiang Affiliated to Guangdong Medical University, Zhanjiang, Guangdong 524048, P.R. China
| | - Yue Zhao
- Department of Psychiatry and Imageology, Central People's Hospital of Zhanjiang Affiliated to Guangdong Medical University, Zhanjiang, Guangdong 524048, P.R. China
| | - Changzheng Zhang
- Department of Psychology and Key Laboratory of Psychological Assessment and Rehabilitation for Exceptional Children, Lingnan Normal University, Zhanjiang, Guangdong 524048, P.R. China
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16
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Black KL, Baumgartner NE, Daniel JM. Lasting impact on memory of midlife exposure to exogenous and endogenous estrogens. Behav Neurosci 2018; 132:547-551. [PMID: 30160505 DOI: 10.1037/bne0000270] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We previously demonstrated that 40 days of prior midlife estradiol treatment results in enhanced spatial memory in aging ovariectomized rats long after termination of the estradiol treatment. Our current goal was to determine whether this benefit is due to lasting impacts on memory specifically of previous exogenous estradiol treatment or simply due to delaying cognitive deficits that occur following loss of ovarian hormones. Middle-aged rats were ovariectomized or underwent sham surgery. Ovariectomized rats received estradiol (Previous Estradiol) or vehicle (Previous Vehicle) implants. Rats undergoing sham surgery (Previous Intact) received vehicle implants. Forty days later, Previous Intact rats were ovariectomized, the other 2 groups underwent sham surgeries, and all implants were removed. Thus, no ovarian or exogenously administered hormones were present during behavior testing. Rats underwent 24 days of acquisition training on an 8-arm radial maze. Following acquisition and again 2 months later, rats were tested on delay trials, during which animals had to remember the location of food rewards across time delays inserted between fourth and fifth arm choices. During acquisition, rats that had previous extended exposure to exogenous estradiol (Previous Estradiol) and endogenous ovarian hormones (Previous Intact) significantly outperformed rats that did not experience extended hormone exposure (Previous Vehicle). However, during delays trials the Previous Estradiol group significantly outperformed both the Previous Vehicle and Previous Intact groups. Results demonstrate that whereas extended exposure to endogenous ovarian hormones may provide short-term cognitive benefits, midlife estradiol treatment following ovariectomy provides additional benefits that persist for months following termination of treatment. (PsycINFO Database Record (c) 2018 APA, all rights reserved).
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Affiliation(s)
| | | | - Jill M Daniel
- Department of Psychology, Neuroscience Program, Brain Institute, Tulane University
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17
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Pollard KJ, Wartman HD, Daniel JM. Previous estradiol treatment in ovariectomized mice provides lasting enhancement of memory and brain estrogen receptor activity. Horm Behav 2018; 102:76-84. [PMID: 29742445 PMCID: PMC6004337 DOI: 10.1016/j.yhbeh.2018.05.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 04/18/2018] [Accepted: 05/03/2018] [Indexed: 12/17/2022]
Affiliation(s)
| | | | - Jill M Daniel
- Tulane University, Tulane Brain Institute, United States; Tulane University, Department of Psychology, United States
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18
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Reilly MP, Weeks CD, Crews D, Gore AC. Application of a novel social choice paradigm to assess effects of prenatal endocrine-disrupting chemical exposure in rats (Rattus norvegicus). ACTA ACUST UNITED AC 2018; 132:253-267. [PMID: 29683687 DOI: 10.1037/com0000103] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Endocrine-disrupting chemical (EDC) exposures during critical periods of gestation cause long-lasting behavioral effects, presumably by disturbing hormonal organization of the brain. Among such EDCs are polychlorinated biphenyls (PCBs), a class of industrial chemicals. PCB exposure in utero leads to alterations in mating behaviors and other sexually dimorphic social interactions in rats. Many of the previous studies on social behavior gave the experimental animal a single or binary choice. This study applied a more complex behavioral apparatus, an X-shaped Plexiglas apparatus (FourPlex), that enabled an experimental animal exposed to PCBs or a vehicle to distinguish and choose among 4 stimulus animals of the same or opposite sex, and of different hormonal status. We found that rats were able to differentiate among the stimuli in the FourPlex and showed the expected preference for an opposite sex, hormone-treated rat, particularly for behaviors conducted in proximity. Prenatal treatment caused subtle shifts in behavior toward stimulus rats in the FourPlex; more robust effects were seen for the sexual dimorphisms in behavior. Importantly, the results differ from our previous results of a simple binary choice model, showing that how an animal behaves in a more complex social paradigm does not predict the outcome in a simple choice model, and vice versa. (PsycINFO Database Record
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Affiliation(s)
- Michael P Reilly
- Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin
| | - Connor D Weeks
- College of Natural Sciences, The University of Texas at Austin
| | - David Crews
- Section of Integrative Biology, The University of Texas at Austin
| | - Andrea C Gore
- Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin
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19
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Prakapenka AV, Hiroi R, Quihuis AM, Carson C, Patel S, Berns-Leone C, Fox C, Sirianni RW, Bimonte-Nelson HA. Contrasting effects of individual versus combined estrogen and progestogen regimens as working memory load increases in middle-aged ovariectomized rats: one plus one does not equal two. Neurobiol Aging 2018; 64:1-14. [PMID: 29316527 PMCID: PMC5820186 DOI: 10.1016/j.neurobiolaging.2017.11.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 11/29/2017] [Accepted: 11/30/2017] [Indexed: 02/03/2023]
Abstract
Most estrogen-based hormone therapies are administered in combination with a progestogen, such as Levonorgestrel (Levo). Individually, the estrogen 17β-estradiol (E2) and Levo can improve cognition in preclinical models. However, although these hormones are often given together clinically, the impact of the E2 + Levo combination on cognitive function has yet to be methodically examined. Thus, we investigated E2 + Levo treatment on a cognitive battery in middle-aged, ovariectomized rats. When administered alone, E2 and Levo treatments each enhanced spatial working memory relative to vehicle treatment, whereas the E2 + Levo combination impaired high working memory load performance relative to E2 only and Levo only treatments. There were no effects on spatial reference memory. Mitogen-activated protein kinases/extracellular signal-regulated kinases pathway activation, which is involved in memory formation and estrogen-induced memory effects, was evaluated in 5 brain regions implicated in learning and memory. A distinct relationship was seen in the E2-only treatment group between mitogen-activated protein kinases/extracellular signal-regulated kinases pathway activation in the frontal cortex and working memory performance. Collectively, the results indicate that the differential neurocognitive effects of combination versus sole treatments are vital considerations as we move forward as a field to develop novel, and to understand currently used, exogenous hormone regimens across the lifespan.
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Affiliation(s)
- Alesia V Prakapenka
- Department of Psychology, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA; Barrow Brain Tumor Research Center, Barrow Neurological Institute, Phoenix, AZ, USA
| | - Ryoko Hiroi
- Department of Psychology, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Alicia M Quihuis
- Department of Psychology, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Catie Carson
- Department of Psychology, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Shruti Patel
- Department of Psychology, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Claire Berns-Leone
- Department of Psychology, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Carly Fox
- Department of Psychology, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA
| | - Rachael W Sirianni
- Barrow Brain Tumor Research Center, Barrow Neurological Institute, Phoenix, AZ, USA
| | - Heather A Bimonte-Nelson
- Department of Psychology, Arizona State University, Tempe, AZ, USA; Arizona Alzheimer's Consortium, Phoenix, AZ, USA.
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20
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Xing FZ, Zhao YG, Zhang YY, He L, Zhao JK, Liu MY, Liu Y, Zhang JQ. Nuclear and membrane estrogen receptor antagonists induce similar mTORC2 activation-reversible changes in synaptic protein expression and actin polymerization in the mouse hippocampus. CNS Neurosci Ther 2018; 24:495-507. [PMID: 29352507 DOI: 10.1111/cns.12806] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 12/23/2017] [Accepted: 12/24/2017] [Indexed: 11/28/2022] Open
Abstract
AIMS Estrogens play pivotal roles in hippocampal synaptic plasticity through nuclear receptors (nERs; including ERα and ERβ) and the membrane receptor (mER; also called GPR30), but the underlying mechanism and the contributions of nERs and mER remain unclear. Mammalian target of rapamycin complex 2 (mTORC2) is involved in actin cytoskeleton polymerization and long-term memory, but whether mTORC2 is involved in the regulation of hippocampal synaptic plasticity by ERs is unclear. METHODS We treated animals with nER antagonists (MPP/PHTPP) or the mER antagonist (G15) alone or in combination with A-443654, an activator of mTORC2. Then, we examined the changes in hippocampal SRC-1 expression, mTORC2 signaling (rictor and phospho-AKTSer473), actin polymerization (phospho-cofilin and profilin-1), synaptic protein expression (GluR1, PSD95, spinophilin, and synaptophysin), CA1 spine density, and synapse density. RESULTS All of the examined parameters except synaptophysin expression were significantly decreased by MPP/PHTPP and G15 treatment. MPP/PHTPP and G15 induced a similar decrease in most parameters except p-cofilin, GluR1, and spinophilin expression. The ER antagonist-induced decreases in these parameters were significantly reversed by mTORC2 activation, except for the change in SRC-1, rictor, and synaptophysin expression. CONCLUSIONS nERs and mER contribute similarly to the changes in proteins and structures associated with synaptic plasticity, and mTORC2 may be a novel target of hippocampal-dependent dementia such as Alzheimer's disease as proposed by previous studies.
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Affiliation(s)
- Fang-Zhou Xing
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, China
| | - Yan-Gang Zhao
- Department of Neurobiology, Third Military Medical University, Chongqing, China
| | - Yuan-Yuan Zhang
- Department of Neurobiology, Third Military Medical University, Chongqing, China
| | - Li He
- School of Nursing, Third Military Medical University, Chongqing, China
| | - Ji-Kai Zhao
- Department of Neurobiology, Third Military Medical University, Chongqing, China
| | - Meng-Ying Liu
- Department of Neurobiology, Third Military Medical University, Chongqing, China
| | - Yan Liu
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, China
| | - Ji-Qiang Zhang
- Department of Neurobiology, Third Military Medical University, Chongqing, China
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21
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Zhao Y, He L, Zhang Y, Zhao J, Liu Z, Xing F, Liu M, Feng Z, Li W, Zhang J. Estrogen receptor alpha and beta regulate actin polymerization and spatial memory through an SRC-1/mTORC2-dependent pathway in the hippocampus of female mice. J Steroid Biochem Mol Biol 2017; 174:96-113. [PMID: 28789972 DOI: 10.1016/j.jsbmb.2017.08.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 07/29/2017] [Accepted: 08/03/2017] [Indexed: 12/18/2022]
Abstract
Aging-related decline of estrogens, especially 17β-estradiol (E2), has been shown to play an important role in the impairment of learning and memory in dementias, such as Alzheimer's disease (AD), but the underlying molecular mechanisms are poorly understood. In this study, we first demonstrated decreases in E2 signaling (aromatase, classic estrogen receptor ERα and ERβ and their coactivator SRC-1), mTORC2 signaling (Rictor and phospho-AKTser473) and actin polymerization (phospho-Cofilin, Profilin-1 and the F-actin/G-actin ratio) in the hippocampus of old female mice compared with those levels detected in the adult hippocampus. We then showed that ERα and ERβ antagonists induced a significant decrease in SRC-1, mTORC2 signaling, actin polymerization, and CA1 spine density, as well as impairments of learning and memory; however, ovariectomy-induced changes of these parameters could be significantly reversed by treatment with ER agonists. We further showed that expression of SRC-1, mTORC2 signaling and actin polymerization could be upregulated by E2 treatment, and the effects of E2 were blocked by the ER antagonists but mimicked by the agonists. We also showed that the lentivirus-mediated SRC-1 knockdown significantly inhibited the agonist-activated mTORC2 signaling and actin polymerization, and the lentivirus-mediated Rictor knockdown also significantly inhibited the agonist-activated actin polymerization. Finally, we demonstrated that the ERα and ERβ antagonists induced a disruption in actin polymerization and an impairment of spatial memory, which were rescued by activation of mTORC2. Taken together, the above results clearly demonstrated an mTORC2-dependent regulation of actin polymerization that contributed to the effects of ERα and ERβ on spatial learning, which may provide a novel target for the prevention and treatment of E2-related dementia in the aged population.
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Affiliation(s)
- Yangang Zhao
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China
| | - Li He
- School of Nursing, Third Military Medical University, Chongqing 400038, China
| | - Yuanyuan Zhang
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China
| | - Jikai Zhao
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China
| | - Zhi Liu
- Department of Histology and Embryology, Third Military Medical University, Chongqing 400038, China
| | - Fangzhou Xing
- Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, 400715, China
| | - Mengying Liu
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China
| | - Ziqi Feng
- Cadet Brigade, Third Military Medical University, Chongqing 400038, China
| | - Wei Li
- School of Nursing, Third Military Medical University, Chongqing 400038, China.
| | - Jiqiang Zhang
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China.
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22
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Engler-Chiurazzi EB, Brown CM, Povroznik JM, Simpkins JW. Estrogens as neuroprotectants: Estrogenic actions in the context of cognitive aging and brain injury. Prog Neurobiol 2017; 157:188-211. [PMID: 26891883 PMCID: PMC4985492 DOI: 10.1016/j.pneurobio.2015.12.008] [Citation(s) in RCA: 137] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 11/06/2015] [Accepted: 12/10/2015] [Indexed: 12/30/2022]
Abstract
There is ample empirical evidence to support the notion that the biological impacts of estrogen extend beyond the gonads to other bodily systems, including the brain and behavior. Converging preclinical findings have indicated a neuroprotective role for estrogen in a variety of experimental models of cognitive function and brain insult. However, the surprising null or even detrimental findings of several large clinical trials evaluating the ability of estrogen-containing hormone treatments to protect against age-related brain changes and insults, including cognitive aging and brain injury, led to hesitation by both clinicians and patients in the use of exogenous estrogenic treatments for nervous system outcomes. That estrogen-containing therapies are used by tens of millions of women for a variety of health-related applications across the lifespan has made identifying conditions under which benefits with estrogen treatment will be realized an important public health issue. Here we provide a summary of the biological actions of estrogen and estrogen-containing formulations in the context of aging, cognition, stroke, and traumatic brain injury. We have devoted special attention to highlighting the notion that estrogen appears to be a conditional neuroprotectant whose efficacy is modulated by several interacting factors. By developing criteria standards for desired beneficial peripheral and neuroprotective outcomes among unique patient populations, we can optimize estrogen treatments for attenuating the consequences of, and perhaps even preventing, cognitive aging and brain injury.
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Affiliation(s)
- E B Engler-Chiurazzi
- Center for Basic and Translational Stroke Research, West Virginia University, Morgantown, WV 26506, United States; Department of Physiology and Pharmacology, West Virginia University, Morgantown, WV 26506, United States.
| | - C M Brown
- Center for Basic and Translational Stroke Research, West Virginia University, Morgantown, WV 26506, United States; Department of Neurobiology and Anatomy, West Virginia University, Morgantown, WV 26506, United States.
| | - J M Povroznik
- Center for Basic and Translational Stroke Research, West Virginia University, Morgantown, WV 26506, United States; Department of Pediatrics, West Virginia University, Morgantown, WV 26506, United States.
| | - J W Simpkins
- Center for Basic and Translational Stroke Research, West Virginia University, Morgantown, WV 26506, United States; Department of Physiology and Pharmacology, West Virginia University, Morgantown, WV 26506, United States.
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23
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Catanese MC, Vandenberg LN. Bisphenol S (BPS) Alters Maternal Behavior and Brain in Mice Exposed During Pregnancy/Lactation and Their Daughters. Endocrinology 2017; 158:516-530. [PMID: 28005399 PMCID: PMC5460783 DOI: 10.1210/en.2016-1723] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 12/05/2016] [Indexed: 01/12/2023]
Abstract
Estrogenic endocrine disrupting chemicals have been shown to disrupt maternal behavior in rodents. We investigated the effects of an emerging xenoestrogen, bisphenol S (BPS), on maternal behavior and brain in CD-1 mice exposed during pregnancy and lactation (F0 generation) and in female offspring exposed during gestation and perinatal development (F1 generation). We observed different effects in F0 and F1 dams for a number of components of maternal behavior, including time on the nest, time spent on nest building, latency to retrieve pups, and latency to retrieve the entire litter. We also characterized expression of estrogen receptor α in the medial preoptic area (MPOA) and quantified tyrosine hydroxylase immunoreactive cells in the ventral tegmental area, 2 brain regions critical for maternal care. BPS-treated females in the F0 generation had a statistically significant increase in estrogen receptor α expression in the caudal subregion of the central MPOA in a dose-dependent manner. In contrast, there were no statistically significant effects of BPS on the MPOA in F1 dams or the ventral tegmental area in either generation. This work demonstrates that BPS affects maternal behavior and brain with outcomes depending on generation, dose, and postpartum period. Many studies examining effects of endocrine disrupting chemicals view the mother as a means by which offspring can be exposed during critical periods of development. Here, we demonstrate that pregnancy and lactation are vulnerable periods for the mother. We also show that developmental BPS exposure alters maternal behavior later in adulthood. Both findings have potential public health implications.
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Affiliation(s)
- Mary C. Catanese
- Graduate Program in Neuroscience and Behavior, University of Massachusetts–Amherst, Amherst, Massachusetts 01003; and
| | - Laura N. Vandenberg
- Graduate Program in Neuroscience and Behavior, University of Massachusetts–Amherst, Amherst, Massachusetts 01003; and
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts–Amherst, Amherst, Massachusetts 01003
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MacLusky NJ, Thomas G, Leranth C. Low dietary soy isoflavonoids increase hippocampal spine synapse density in ovariectomized rats. Brain Res 2017; 1657:361-367. [PMID: 28063855 DOI: 10.1016/j.brainres.2017.01.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 12/21/2016] [Accepted: 01/01/2017] [Indexed: 01/14/2023]
Abstract
High dietary intake of plant estrogens (phytoestrogens) can affect brain structure and function. The effects of phytoestrogen intake within the range of normal animal and human dietary consumption, however, remain uncertain. The aim of the present study was to determine the effects of the isoflavonoids present in a standard low phytoestrogen laboratory rat chow on spine synapse density in the stratum radiatum of area CA1 of the hippocampus. Weanling rats (22days old) were fed either standard chow (Teklad 2018), a nutritionally comparable diet without soy (Teklad 2016) or a custom diet containing Teklad 2016 supplemented with the principal soy isoflavonoids, daidzein and genistein, for 40days. Rats were ovariectomized at 54days of age. Eight days later, spine synapse density on the apical dendrites of hippocampal pyramidal neurons in the stratum radiatum of area CA1 was measured by electron microscopic stereological analysis. Animals maintained on Teklad 2016 exhibited an approximately 60% lower CA1 spine synapse density than animals consuming Teklad 2018. Replacing genistein and daidzein in Teklad 2016 returned synapse density to levels indistinguishable from those in animals on Teklad 2018. These results indicate that the isoflavonoids in a standard laboratory rat diet exert significant effects on spine synapse density in the CA1 region of the hippocampus. Since changes in spine synapse density in this region of the hippocampus have been linked to cognitive performance and mood state, these data suggest that even relatively low daily consumption of soy phytoestrogens may be sufficient to influence hippocampal function.
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Affiliation(s)
- Neil J MacLusky
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
| | - Gladis Thomas
- Departments of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, CT 06520-8063, USA
| | - Csaba Leranth
- Departments of Obstetrics and Gynecology, Yale University School of Medicine, New Haven, CT 06520-8063, USA; Neurobiology, Yale University School of Medicine, New Haven, CT 06520-8063, USA
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25
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Koebele SV, Bimonte-Nelson HA. The endocrine-brain-aging triad where many paths meet: female reproductive hormone changes at midlife and their influence on circuits important for learning and memory. Exp Gerontol 2016; 94:14-23. [PMID: 27979770 DOI: 10.1016/j.exger.2016.12.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 12/09/2016] [Accepted: 12/10/2016] [Indexed: 01/15/2023]
Abstract
Female mammals undergo natural fluctuations in sex steroid hormone levels throughout life. These fluctuations span from early development, to cyclic changes associated with the menstrual or estrous cycle and pregnancy, to marked hormone flux during perimenopause, and a final decline at reproductive senescence. While the transition to reproductive senescence is not yet fully understood, the vast majority of mammals experience this spontaneous, natural phenomenon with age, which has broad implications for long-lived species. Indeed, this post-reproductive life stage, and its transition, involves significant and enduring physiological changes, including considerably altered sex steroid hormone and gonadotropin profiles that impact multiple body systems, including the brain. The endocrine-brain-aging triad is especially noteworthy, as many paths meet and interact. Many of the brain regions affected by aging are also sensitive to changes in ovarian hormone levels, and aging and reproductive senescence are both associated with changes in memory performance. This review explores how menopause is related to cognitive aging, and discusses some of the key neural systems and molecular factors altered with age and reproductive hormone level changes, with an emphasis on brain regions important for learning and memory.
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Affiliation(s)
- Stephanie V Koebele
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, United States
| | - Heather A Bimonte-Nelson
- Department of Psychology, Arizona State University, Tempe, AZ 85287, United States; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, United States.
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26
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Black KL, Witty CF, Daniel JM. Previous Midlife Oestradiol Treatment Results in Long-Term Maintenance of Hippocampal Oestrogen Receptor α Levels in Ovariectomised Rats: Mechanisms and Implications for Memory. J Neuroendocrinol 2016; 28:10.1111/jne.12429. [PMID: 27603028 PMCID: PMC5527336 DOI: 10.1111/jne.12429] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 08/31/2016] [Accepted: 09/02/2016] [Indexed: 01/28/2023]
Abstract
Ovariectomised rats that have received previous administration of oestradiol in midlife display enhanced cognition and increased hippocampal levels of oestrogen receptor (ER)α months after oestradiol treatment ended compared to ovariectomised controls. The present study aimed to investigate the mechanisms by which ERα levels are maintained following midlife oestradiol exposure and the role of ERα in memory in ageing females in the absence of circulating oestrogens. Unliganded ERα has increased interaction with the ubiquitin ligase, C-terminus of Hsc-70 interacting protein (CHIP), leading to increased degradation of the receptor. In our first experiment, we tested the hypothesis that midlife oestradiol exposure in ovariectomised rats results in decreased interaction between CHIP and hippocampal ERα, leading to increased levels of ERα. Middle-aged rats were ovariectomised and received oestradiol or vehicle implants. After 40 days, implants were removed. One month later, rats were killed and hippocampi were processed for whole protein western blotting and co-immunoprecipitation, in which ERα was immunoprecipitated from lysate. As expected, ERα protein expression was increased in rats previously treated with oestradiol compared to vehicle-treated rats. In rats treated with oestradiol, there was a decrease in CHIP-ERα interaction, suggesting that previous oestradiol treatment reduces interaction, slowing the degradation of ERα. In a second experiment, we determined the impact on memory of antagonism of ER in the absence of circulating oestrogens. Rats were ovariectomised and implanted with oestradiol capsules. Capsules were removed after 40 days. Rats received chronic i.c.v. infusion of ER antagonist, ICI 182 780, or artificial cerebrospinal fluid vehicle and were tested on a spatial memory radial-maze task. Rats treated with ICI 182 780 had significantly worse performance (more errors). These experiments provide evidence that previous midlife oestradiol treatment maintains hippocampal ERα by decreasing its interaction with CHIP and that activation of these receptors provides cognitive benefits in the absence of circulating oestrogens.
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Affiliation(s)
- K L Black
- Program in Neuroscience, Tulane University, New Orleans, LA, USA
- Brain Institute, Tulane University, New Orleans, LA, USA
| | - C F Witty
- Program in Neuroscience, Tulane University, New Orleans, LA, USA
| | - J M Daniel
- Program in Neuroscience, Tulane University, New Orleans, LA, USA.
- Brain Institute, Tulane University, New Orleans, LA, USA.
- Department of Psychology, Tulane University, New Orleans, LA, USA.
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Pinceti E, Shults CL, Rao YS, Pak TR. Differential Effects of E2 on MAPK Activity in the Brain and Heart of Aged Female Rats. PLoS One 2016; 11:e0160276. [PMID: 27487271 PMCID: PMC4972350 DOI: 10.1371/journal.pone.0160276] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 07/15/2016] [Indexed: 12/21/2022] Open
Abstract
Aging and the coincident loss of circulating estrogens at menopause lead to increased risks for neurological and cardiovascular pathologies. Clinical studies show that estrogen therapy (ET) can be beneficial in mitigating these negative effects, in both the brain and heart, when it is initiated shortly after the perimenopausal transition. However, this same therapy is detrimental when initiated >10 years postmenopause. Importantly, the molecular mechanisms underlying this age-related switch in ET efficacy are unknown. Estrogen receptors (ERs) mediate the neuroprotective and cardioprotective functions of estrogens by modulating gene transcription or, non-genomically, by activating second messenger signaling pathways, such as mitogen activated protein kinases (MAPK). These kinases are critical regulators of cell signaling pathways and have widespread downstream effects. Our hypothesis is that age and estrogen deprivation following menopause alters the expression and activation of the MAPK family members p38 and ERK in the brain and heart. To test this hypothesis, we used a surgically induced model of menopause in 18 month old rats through bilateral ovariectomy (OVX) followed by an acute dose of 17β-estradiol (E2) administered at varying time points post-OVX (1 week, 4 weeks, 8 weeks, or 12 weeks). Age and E2 treatment differentially regulated kinase activity in both the brain and heart, and the effects were also brain region specific. MAPK signaling plays an integral role in aging, and the aberrant regulation of those signaling pathways might be involved in age-related disorders. Clinical studies show benefits of ET during early menopause but detrimental effects later, which might be reflective of changes in kinase expression and activation status.
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Affiliation(s)
- Elena Pinceti
- Department of Cell and Molecular Physiology, Health Science Division, Loyola University Chicago, Maywood, Illinois, United States of America
| | - Cody L. Shults
- Department of Cell and Molecular Physiology, Health Science Division, Loyola University Chicago, Maywood, Illinois, United States of America
| | - Yathindar S. Rao
- Department of Cell and Molecular Physiology, Health Science Division, Loyola University Chicago, Maywood, Illinois, United States of America
| | - Toni R. Pak
- Department of Cell and Molecular Physiology, Health Science Division, Loyola University Chicago, Maywood, Illinois, United States of America
- * E-mail:
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Grissom EM, Daniel JM. Evidence for Ligand-Independent Activation of Hippocampal Estrogen Receptor-α by IGF-1 in Hippocampus of Ovariectomized Rats. Endocrinology 2016; 157:3149-56. [PMID: 27254005 PMCID: PMC4967122 DOI: 10.1210/en.2016-1197] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 05/26/2016] [Indexed: 11/19/2022]
Abstract
In the absence of ovarian estrogens, increased levels of estrogen receptor (ER)α in the hippocampus are associated with improvements in cognition. In vitro evidence indicates that under conditions of low estrogen, growth factors, including Insulin-Like Growth Factor 1 (IGF-1), can activate ERα and regulate ERα-mediated transcription through mechanisms that likely involve modification of phosphorylation sites on the receptor. The goal of the current work was to investigate a role for IGF-1 in ligand-independent activation of ERα in the hippocampus of female rats. Ovariectomized rats received a single intracerebroventricular infusion of IGF-1 and hippocampi were collected 1 or 24 hours later. After 1 h, IGF-1 increased hippocampal levels of phosphorylated ERα at serine 118 (S118) as revealed by Western blotting. Coimmunoprecipitation revealed that at 1 hour after infusion, IGF-1 increased association between ERα and steroid receptor coactivator 1, a histone acetyltransferase that increases transcriptional activity of phosphorylated ERα. IGF-1 infusion increased levels of the ERα-regulated proteins ERα, choline acetyltransferase, and brain-derived neurotrophic factor in the hippocampus 24 hours after infusion. Results indicate that IGF-1 activates ERα in ligand-independent manner in the hippocampus via phosphorylation at S118 resulting in increased association of ERα with steroid receptor coactivator 1 and elevation of ER-regulated proteins. To our knowledge, these data are the first in vivo evidence of ligand-independent actions of ERα and provide a mechanism by which ERα can impact memory in the absence of ovarian estrogens.
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Affiliation(s)
- Elin M Grissom
- Department of Psychology and Program in Neuroscience, Tulane University, New Orleans, Louisiana 70118
| | - Jill M Daniel
- Department of Psychology and Program in Neuroscience, Tulane University, New Orleans, Louisiana 70118
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Tuscher JJ, Szinte JS, Starrett JR, Krentzel AA, Fortress AM, Remage-Healey L, Frick KM. Inhibition of local estrogen synthesis in the hippocampus impairs hippocampal memory consolidation in ovariectomized female mice. Horm Behav 2016; 83:60-67. [PMID: 27178577 PMCID: PMC4915975 DOI: 10.1016/j.yhbeh.2016.05.001] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 05/02/2016] [Indexed: 01/29/2023]
Abstract
The potent estrogen 17β-Estradiol (E2) plays a critical role in mediating hippocampal function, yet the precise mechanisms through which E2 enhances hippocampal memory remain unclear. In young adult female rodents, the beneficial effects of E2 on memory are generally attributed to ovarian-synthesized E2. However, E2 is also synthesized in the adult brain in numerous species, where it regulates synaptic plasticity and is synthesized in response to experiences such as exposure to females or conspecific song. Although de novo E2 synthesis has been demonstrated in rodent hippocampal cultures, little is known about the functional role of local E2 synthesis in mediating hippocampal memory function. Therefore, the present study examined the role of hippocampal E2 synthesis in hippocampal memory consolidation. Using bilateral dorsal hippocampal infusions of the aromatase inhibitor letrozole, we first found that blockade of dorsal hippocampal E2 synthesis impaired hippocampal memory consolidation. We next found that elevated levels of E2 in the dorsal hippocampus observed 30min after object training were blocked by dorsal hippocampal infusion of letrozole, suggesting that behavioral experience increases acute and local E2 synthesis. Finally, aromatase inhibition did not prevent exogenous E2 from enhancing hippocampal memory consolidation, indicating that hippocampal E2 synthesis is not necessary for exogenous E2 to enhance hippocampal memory. Combined, these data are consistent with the hypothesis that hippocampally-synthesized E2 is necessary for hippocampus-dependent memory consolidation in rodents.
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Affiliation(s)
- Jennifer J Tuscher
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, United States
| | - Julia S Szinte
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, United States
| | - Joseph R Starrett
- Department of Psychological and Brain Sciences and Neuroscience and Behavior Program, Center for Neuroendocrine Studies, University of Massachusetts Amherst, Amherst, MA, United States
| | - Amanda A Krentzel
- Department of Psychological and Brain Sciences and Neuroscience and Behavior Program, Center for Neuroendocrine Studies, University of Massachusetts Amherst, Amherst, MA, United States
| | - Ashley M Fortress
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, United States
| | - Luke Remage-Healey
- Department of Psychological and Brain Sciences and Neuroscience and Behavior Program, Center for Neuroendocrine Studies, University of Massachusetts Amherst, Amherst, MA, United States
| | - Karyn M Frick
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, United States.
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Abstract
UNLABELLED A decline in estradiol (E2)-mediated cognitive benefits denotes a critical window for the therapeutic effects of E2, but the mechanism for closing of the critical window is unknown. We hypothesized that upregulating the expression of estrogen receptor α (ERα) or estrogen receptor β (ERβ) in the hippocampus of aged animals would restore the therapeutic potential of E2 treatments and rejuvenate E2-induced hippocampal plasticity. Female rats (15 months) were ovariectomized, and, 14 weeks later, adeno-associated viral vectors were used to express ERα, ERβ, or green fluorescent protein (GFP) in the CA1 region of the dorsal hippocampus. Animals were subsequently treated for 5 weeks with cyclic injections of 17β-estradiol-3-benzoate (EB, 10 μg) or oil vehicle. Spatial memory was examined 48 h after EB/oil treatment. EB treatment in the GFP (GFP + EB) and ERβ (ERβ + EB) groups failed to improve episodic spatial memory relative to oil-treated animals, indicating closing of the critical window. Expression of ERβ failed to improve cognition and was associated with a modest learning impairment. Cognitive benefits were specific to animals expressing ERα that received EB treatment (ERα + EB), such that memory was improved relative to ERα + oil and GFP + EB. Similarly, ERα + EB animals exhibited enhanced NMDAR-mediated synaptic transmission compared with the ERα + oil and GFP + EB groups. This is the first demonstration that the window for E2-mediated benefits on cognition and hippocampal E2 responsiveness can be reinstated by increased expression of ERα. SIGNIFICANCE STATEMENT Estradiol is neuroprotective, promotes synaptic plasticity in the hippocampus, and protects against cognitive decline associated with aging and neurodegenerative diseases. However, animal models and clinical studies indicate a critical window for the therapeutic treatment such that the beneficial effects are lost with advanced age and/or with extended hormone deprivation. We used gene therapy to upregulate expression of the estrogen receptors ERα and ERβ and demonstrate that the window for estradiol's beneficial effects on memory and hippocampal synaptic function can be reinstated by enhancing the expression of ERα. Our findings suggest that the activity of ERα controls the therapeutic window by regulating synaptic plasticity mechanisms involved in memory.
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Mitrović N, Zarić M, Drakulić D, Martinović J, Stanojlović M, Sévigny J, Horvat A, Nedeljković N, Grković I. 17β-Estradiol upregulates ecto-5'-nucleotidase (CD73) in hippocampal synaptosomes of female rats through action mediated by estrogen receptor-α and -β. Neuroscience 2016; 324:286-96. [PMID: 26987957 DOI: 10.1016/j.neuroscience.2016.03.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 02/23/2016] [Accepted: 03/08/2016] [Indexed: 02/06/2023]
Abstract
17β-Estradiol (E2) crucially affects several processes in the hippocampus of both sexes. E2 acts upon estradiol receptors ERα and ERβ, influencing target gene expression and/or modulates intracellular signaling cascades. Another potent modulator of hippocampal function is nucleoside adenosine, the final product of ectonucleotidase cascade, enzymes which hydrolyze extracellular ATP to adenosine. The last and rate-limiting step of the hydrolysis is catalyzed by membrane-bound ecto-5'-nucleotidase (eN). Previous findings obtained on adenosine metabolism in brain suggest that eN may be modulated by ovarian steroids. Therefore, the present study reports that the activity and protein abundance of membrane-bound eN fluctuates across the estrus cycle in the hippocampal synaptosomes of female rats. Further, we analyzed the role of E2 and its intracellular receptors on the expression of eN in ovariectomized females. We found that E2 upregulated eN activity and protein abundance in the hippocampal synaptosomes. Application of nonspecific ER antagonist, ICI 182,780 and selective ERα and ERβ agonists, PPT and DPN, respectively, demonstrated the involvement of both receptor subtypes in observed actions. Selective ERα receptor agonist, PPT, induced upregulation of both the protein level and activity of eN, while application of selective ERβ receptor agonist, DPN, increased only the activity of eN. In both cases, E2 entered into the intracellular compartment and activated ER(s), which was demonstrated by membrane impermeable E2-BSA conjugate. Together these results imply that E2-induced effects on connectivity and functional properties of the hippocampal synapses may be in part mediated through observed effect on eN.
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Affiliation(s)
- N Mitrović
- Department of Molecular Biology and Endocrinology, VINČA Institute of Nuclear Sciences, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - M Zarić
- Department of Molecular Biology and Endocrinology, VINČA Institute of Nuclear Sciences, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - D Drakulić
- Department of Molecular Biology and Endocrinology, VINČA Institute of Nuclear Sciences, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - J Martinović
- Department of Molecular Biology and Endocrinology, VINČA Institute of Nuclear Sciences, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - M Stanojlović
- Department of Molecular Biology and Endocrinology, VINČA Institute of Nuclear Sciences, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - J Sévigny
- Département de microbiologie-infectiologie et d'immunologie, Faculté de Médecine, Université Laval, Québec G1V 0A6, QC, Canada; Centre de recherche du CHU de Québec - Université Laval, G1V 4G2 QC, Canada
| | - A Horvat
- Department of Molecular Biology and Endocrinology, VINČA Institute of Nuclear Sciences, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia
| | - N Nedeljković
- Institute for Physiology and Biochemistry, Faculty of Biology, University of Belgrade, Studentski trg 3, 11000 Belgrade, Serbia
| | - I Grković
- Department of Molecular Biology and Endocrinology, VINČA Institute of Nuclear Sciences, University of Belgrade, Mike Petrovića Alasa 12-14, 11001 Belgrade, Serbia.
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Chang H, Wang M, Xia W, Chen T, Huo W, Mao Z, Zhu Y, Li Y, Xu S. Perinatal exposure to low-dose bisphenol A disrupts learning/memory and DNA methylation of estrogen receptor alpha in the hippocampus. Toxicol Res (Camb) 2016; 5:828-835. [PMID: 30090393 DOI: 10.1039/c5tx00449g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 01/31/2016] [Indexed: 11/21/2022] Open
Abstract
Developmental exposure to bisphenol A (BPA) has been indicated to pose long-lasting effects on brain development and behaviors in adulthood. Previous studies have also shown that BPA may disrupt the epigenetic programming of genes in the brain. Here, we focused on investigating the effects of perinatal exposure to low-dose BPA on learning/memory function and emotional regulation, as well as the associated molecular events. Pregnant Sprague-Dawley (SD) rats were treated with control corn oil or BPA (40 μg kg-1 per day) throughout gestation and lactation. Morris water maze (MWM) and elevated plus maze (EPM) were used to evaluate learning/memory and anxiety-like behaviors at postnatal day (PND) 60 and 85 respectively. The expression level of mRNA for estrogen receptors (ER), ERα and ERβ, in the hippocampus and the serum corticosterone level were determined, as well as the DNA methylation status of the ERα gene promoter. Perinatal exposure to BPA prolonged the escape latency independent of gender, and decreased the percentage of time spent in the target quadrant when examined in the MWM task. While no substantial alteration was observed in the EPM test, the serum corticosterone level was altered in a gender-specific manner. BPA also decreased the expression of mRNA for ERα in the hippocampus, along with elevated DNA methylation of the ERα gene promoter. These results suggest that perinatal exposure to BPA impairs learning/memory function and elevated DNA methylation of the ERα gene in the hippocampus may be involved.
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Affiliation(s)
- Huailong Chang
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
| | - Mu Wang
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
| | - Wei Xia
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
| | - Tian Chen
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
| | - Wenqian Huo
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
| | - Zhenxing Mao
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
| | - Yingshuang Zhu
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
| | - Yuanyuan Li
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
| | - Shunqing Xu
- Key Laboratory of Environment and Health , Ministry of Education & Ministry of Environmental Protection , and State Key Laboratory of Environmental Health , School of Public Health , Tongji Medical College , Huazhong University of Science and Technology , Wuhan 430030 , China . ; ; ; Tel: +86-27-83657705, +86-27-83693417
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Qiu L, Zhao Y, Guo Q, Zhang Y, He L, Li W, Zhang J. Dose-dependent regulation of steroid receptor coactivator-1 and steroid receptors by testosterone propionate in the hippocampus of adult male mice. J Steroid Biochem Mol Biol 2016; 156:23-31. [PMID: 26607693 DOI: 10.1016/j.jsbmb.2015.11.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 11/13/2015] [Accepted: 11/16/2015] [Indexed: 01/08/2023]
Abstract
Androgens have been proposed to play important roles in the regulation of hippocampus function either directly, through the androgen receptor (AR), or indirectly, through estrogen receptors (ERs), after aromatization into estradiol. Steroid receptor coactivator-1 (SRC-1) is present in the hippocampus of several species, and its expression is regulated by development and aging, as well as by orchidectomy and aromatase inhibitor letrozole administration, while ovariectomy only transiently downregulated hippocampal SRC-1. However, whether the expression of hippocampal SRC-1 can be directly regulated by testosterone, the principal male sex hormone, remains unclear. In the present study, we investigated the expression of hippocampal SRC-1 after orchidectomy and testosterone treatment using immunohistochemistry and Western blot analysis. We found that while hippocampal SRC-1 was significantly downregulated by orchidectomy (ORX), its expression was rescued by treatment with testosterone in a dose-dependent manner. Furthermore, we noticed that the decreased expression of hippocampal AR, ERs and the synaptic proteins GluR-1 and PSD-95 induced by ORX was also rescued by testosterone treatment in a dose-dependent manner. However, we found that hippocampal membrane estrogen receptor GPR30 and dendritic spine marker spinophilin were not altered by ORX or testosterone treatment. Together, the above results provided the first direct evidence for the androgenic regulation on hippocampal SRC-1, indicating that SRC-1 may be a direct target of androgenic regulation on the hippocampus. Furthermore, because AR and ERs can be differentially regulated by testosterone, and the transcriptional activity requires the involvement of local SRC-1, and considering the complicated regulatory pathway of each individual receptor, the converged hub regulator SRC-1 of these nuclear receptor networks is worthy of further investigation.
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Affiliation(s)
- Linli Qiu
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China; Department of Filed Nursing, School of Nursing, Third Military Medical University, Chongqing 400038, China
| | - Yangang Zhao
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China
| | - Qiang Guo
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China
| | - Yuanyuan Zhang
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China
| | - Li He
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China; Department of Filed Nursing, School of Nursing, Third Military Medical University, Chongqing 400038, China
| | - Wei Li
- Department of Filed Nursing, School of Nursing, Third Military Medical University, Chongqing 400038, China.
| | - Jiqiang Zhang
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, Third Military Medical University, Chongqing 400038, China.
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Ghasemi M, Zendehbad B, Zabihi H, Hosseini M, Hadjzadeh MAR, Hayatdavoudi P. Beneficial Effect of Leptin on Spatial Learning and Memory in Streptozotocin-Induced Diabetic Rats. Balkan Med J 2016; 33:102-7. [PMID: 26966625 DOI: 10.5152/balkanmedj.2015.15084] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 08/20/2015] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Diabetes mellitus is a chronic disease which may be accompanied by cognitive impairments. The expression of the obesity gene (ob) is decreased in insulin-deficient diabetic animals and increased after the administration of insulin or leptin. Plasma leptin levels are reduced in the streptozotocin (STZ)-induced diabetic rats. Therefore, the deleterious effects of diabetes on memory may be due to the reduction of leptin. AIMS Investigate the effect of subcutaneous injection of leptin on spatial learning and memory in STZ-induced diabetic rats. STUDY DESIGN Animal experimentation. METHODS The rats were divided into three groups: 1-control, 2- diabetic, and 3- diabetic-leptin. Diabetes was induced in groups 2 and 3 by STZ injection (55 mg/kg) intraperitoneally (i.p). The animals received leptin (0.1 mg/kg) or saline subcutaneously (s.c) for 10 days before behavioral studies. Then, they were examined in the Morris water maze over 3 blocks after 3 days of the last injection of leptin. RESULTS The travelled path length and time spent to reach the platform significantly increased in the diabetic group (p<0.001) and decreased with leptin treatment (p<0.01 & p<0.001 respectively); also, a significant increase in path length and time was observed between the diabetic-leptin group and the diabetic group (p<0.01, p<0.001, respectively) in the probe test. CONCLUSION Leptin can exert positive effects on memory impairments in diabetic rats.
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Affiliation(s)
- Mohsen Ghasemi
- Department of Physiology, North Khorasan University of Medical Sciences Faculty of Medicine, Bojnurd, Iran
| | - Bamdad Zendehbad
- Department of Physiology, Neurocognitive Research Center, Mashhad University of Medical Sciences Faculty of Medicine, Mashhad, Iran
| | - Hoda Zabihi
- Department of Physiology, Neurocognitive Research Center, Mashhad University of Medical Sciences Faculty of Medicine, Mashhad, Iran
| | - Mahmoud Hosseini
- Department of Physiology, Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences Faculty of Medicine, Mashhad, Iran
| | - Mousa Al Reza Hadjzadeh
- Department of Physiology, Neurocognitive Research Center, Mashhad University of Medical Sciences Faculty of Medicine, Mashhad, Iran
| | - Parichehr Hayatdavoudi
- Department of Physiology, Neurocognitive Research Center, Mashhad University of Medical Sciences Faculty of Medicine, Mashhad, Iran
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Koebele SV, Bimonte-Nelson HA. Trajectories and phenotypes with estrogen exposures across the lifespan: What does Goldilocks have to do with it? Horm Behav 2015; 74:86-104. [PMID: 26122297 PMCID: PMC4829405 DOI: 10.1016/j.yhbeh.2015.06.009] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 05/14/2015] [Accepted: 06/04/2015] [Indexed: 01/04/2023]
Abstract
This article is part of a Special Issue "Estradiol and cognition". Estrogens impact the organization and activation of the mammalian brain in both sexes, with sex-specific critical windows. Throughout the female lifespan estrogens activate brain substrates previously organized by estrogens, and estrogens can induce non-transient brain and behavior changes into adulthood. Therefore, from early life through the transition to reproductive senescence and beyond, estrogens are potent modulators of the brain and behavior. Organizational, reorganizational, and activational hormone events likely impact the trajectory of brain profiles during aging. A "brain profile," or quantitative brain measurement for research purposes, is typically a snapshot in time, but in life a brain profile is anything but static--it is in flux, variable, and dynamic. Akin to this, the only thing continuous and consistent about hormone exposures across a female's lifespan is that they are noncontinuous and inconsistent, building and rebuilding on past exposures to create a present brain and behavioral landscape. Thus, hormone variation is especially rich in females, and is likely the destiny for maximal responsiveness in the female brain. The magnitude and direction of estrogenic effects on the brain and its functions depend on a myriad of factors; a "Goldilocks" phenomenon exists for estrogens, whereby if the timing, dose, and regimen for an individual are just right, markedly efficacious effects present. Data indicate that exogenously-administered estrogens can bestow beneficial cognitive effects in some circumstances, especially when initiated in a window of opportunity such as the menopause transition. Could it be that the age-related reduction in efficacy of estrogens reflects the closure of a late-in-life critical window occurring around the menopause transition? Information from classic and contemporary works studying organizational/activational estrogen actions, in combination with acknowledging the tendency for maximal responsiveness to cyclicity, will elucidate ways to extend sensitivity and efficacy into post-menopause.
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Affiliation(s)
- Stephanie V Koebele
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, USA
| | - Heather A Bimonte-Nelson
- Department of Psychology, Arizona State University, Tempe, AZ 85287, USA; Arizona Alzheimer's Consortium, Phoenix, AZ 85006, USA.
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Duarte-Guterman P, Yagi S, Chow C, Galea LAM. Hippocampal learning, memory, and neurogenesis: Effects of sex and estrogens across the lifespan in adults. Horm Behav 2015; 74:37-52. [PMID: 26122299 DOI: 10.1016/j.yhbeh.2015.05.024] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 04/29/2015] [Accepted: 05/26/2015] [Indexed: 01/12/2023]
Abstract
This article is part of a Special Issue "Estradiol and Cognition". There are sex differences in hippocampus-dependent cognition and neurogenesis suggesting that sex hormones are involved. Estrogens modulate certain forms of spatial and contextual memory and neurogenesis in the adult female rodent, and to a lesser extent male, hippocampus. This review focuses on the effects of sex and estrogens on hippocampal learning, memory, and neurogenesis in the young and aged adult rodent. We discuss how factors such as the type of estrogen, duration and dose of treatment, timing of treatment, and type of memory influence the effects of estrogens on cognition and neurogenesis. We also address how reproductive experience (pregnancy and mothering) and aging interact with estrogens to modulate hippocampal cognition and neurogenesis in females. Given the evidence that adult hippocampal neurogenesis plays a role in long-term spatial memory and pattern separation, we also discuss the functional implications of regulating neurogenesis in the hippocampus.
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Affiliation(s)
- Paula Duarte-Guterman
- Department of Psychology, Centre for Brain Health, Program in Neuroscience, University of British Columbia, Vancouver, Canada
| | - Shunya Yagi
- Department of Psychology, Centre for Brain Health, Program in Neuroscience, University of British Columbia, Vancouver, Canada
| | - Carmen Chow
- Department of Psychology, Centre for Brain Health, Program in Neuroscience, University of British Columbia, Vancouver, Canada
| | - Liisa A M Galea
- Department of Psychology, Centre for Brain Health, Program in Neuroscience, University of British Columbia, Vancouver, Canada.
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Daniel JM, Witty CF, Rodgers SP. Long-term consequences of estrogens administered in midlife on female cognitive aging. Horm Behav 2015; 74:77-85. [PMID: 25917862 PMCID: PMC4573273 DOI: 10.1016/j.yhbeh.2015.04.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 04/08/2015] [Accepted: 04/12/2015] [Indexed: 12/15/2022]
Abstract
This article is part of a Special Issue "Estradiol and cognition". Many of the biochemical, structural, and functional changes that occur as the female brain ages are influenced by changes in levels of estrogens. Administration of estrogens begun during a critical window near menopause is hypothesized to prevent or delay age-associated cognitive decline. However, due to potential health risks women often limit use of estrogen therapy to a few years to treat menopausal symptoms. The long-term consequences for the brain of short-term use of estrogens are unknown. Interestingly, there are preliminary data to suggest that short-term use of estrogens during the menopausal transition may afford long-term cognitive benefits to women as they age. Thus, there is the intriguing possibility that short-term estrogen therapy may provide lasting benefits to the brain and cognition. The focus of the current review is an examination of the long-term impact for cognition of midlife use of estrogens. We review data from our lab and others indicating that the ability of midlife estrogens to impact estrogen receptors in the hippocampus may contribute to its ability to exert lasting impacts on cognition in aging females.
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Affiliation(s)
- Jill M Daniel
- Department of Psychology, Tulane University New Orleans, LA 70118, USA; Program in Neuroscience, Tulane University New Orleans, LA 70118, USA.
| | - Christine F Witty
- Program in Neuroscience, Tulane University New Orleans, LA 70118, USA
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Abstract
Estradiol effects on memory depend on hormone levels and the interaction of different estrogen receptors within neural circuits. Estradiol induces gene transcription and rapid membrane signaling mediated by estrogen receptor-alpha (ERα), estrogen receptor-beta (ERβ), and a recently characterized G-protein coupled estrogen receptor, each with distinct distributions and ability to influence estradiol-dependent signaling. Investigations using receptor specific agonists suggest that all three receptors rapidly activate kinase-signaling and have complex dose-dependent influences on memory. Research employing receptor knockout mice demonstrate that ERα maintains transcription and memory as estradiol levels decline. This work indicates a regulatory role of ERβ in transcription and cognition, which depends on estradiol levels and the function of ERα. The regulatory role of ERβ is due in part to ERβ acting as a negative regulator of ERα-mediated transcription. Vector-mediated expression of estrogen receptors in the hippocampus provides an innovative research approach and suggests that memory depends on the relative expression of ERα and ERβ interacting with estradiol levels. Notably, the ability of estradiol to improve cognition declines with advanced age along with decreased expression of estrogen receptors. Thus, it will be important for future research to determine the mechanisms that regulate estrogen receptor expression during aging.
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Affiliation(s)
- Linda A Bean
- Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA
| | - Lara Ianov
- Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA Genetics and Genomics Program, Genetics Institute, University of Florida, Gainesville, FL, USA
| | - Thomas C Foster
- Department of Neuroscience, McKnight Brain Institute, University of Florida, Gainesville, FL, USA Genetics and Genomics Program, Genetics Institute, University of Florida, Gainesville, FL, USA
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Zhao W, Luo C, Wang J, Gong J, Li B, Gong Y, Wang J, Wang H. 3-N-butylphthalide improves neuronal morphology after chronic cerebral ischemia. Neural Regen Res 2014; 9:719-26. [PMID: 25206879 PMCID: PMC4146270 DOI: 10.4103/1673-5374.131576] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/24/2014] [Indexed: 11/06/2022] Open
Abstract
3-N-butylphthalide is an effective drug for acute ischemic stroke. However, its effects on chronic cerebral ischemia-induced neuronal injury remain poorly understood. Therefore, this study ligated bilateral carotid arteries in 15-month-old rats to simulate chronic cerebral ischemia in aged humans. Aged rats were then intragastrically administered 3-n-butylphthalide. 3-N-butylphthalide administration improved the neuronal morphology in the cerebral cortex and hippocampus of rats with chronic cerebral ischemia, increased choline acetyltransferase activity, and decreased malondialdehyde and amyloid beta levels, and greatly improved cognitive function. These findings suggest that 3-n-butylphthalide alleviates oxidative stress caused by chronic cerebral ischemia, improves cholinergic function, and inhibits amyloid beta accumulation, thereby improving cerebral neuronal injury and cognitive deficits.
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Affiliation(s)
- Wanhong Zhao
- Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei Province, China
| | - Chao Luo
- Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei Province, China
| | - Jue Wang
- Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei Province, China
| | - Jian Gong
- Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei Province, China
| | - Bin Li
- Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei Province, China
| | - Yingxia Gong
- Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei Province, China
| | - Jun Wang
- Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei Province, China
| | - Hanqin Wang
- Institute of Basic Medical Sciences, Hubei University of Medicine, Shiyan, Hubei Province, China
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Luine VN. Estradiol and cognitive function: past, present and future. Horm Behav 2014; 66:602-18. [PMID: 25205317 PMCID: PMC4318702 DOI: 10.1016/j.yhbeh.2014.08.011] [Citation(s) in RCA: 294] [Impact Index Per Article: 29.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 08/26/2014] [Accepted: 08/29/2014] [Indexed: 12/13/2022]
Abstract
A historical perspective on estradiol's enhancement of cognitive function is presented, and research, primarily in animals, but also in humans, is reviewed. Data regarding the mechanisms underlying the enhancements are discussed. Newer studies showing rapid effects of estradiol on consolidation of memory through membrane interactions and activation of inter-cellular signaling pathways are reviewed as well as studies focused on traditional genomic mechanisms. Recent demonstrations of intra-neuronal estradiol synthesis and possible actions as a neurosteroid to promote memory are discussed. This information is applied to the critical issue of the current lack of effective hormonal (or other) treatments for cognitive decline associated with menopause and aging. Finally, the critical period hypothesis for estradiol effects is discussed along with novel strategies for hormone/drug development. Overall, the historical record documents that estradiol positively impacts some aspects of cognitive function, but effective therapeutic interventions using this hormone have yet to be realized.
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Affiliation(s)
- Victoria N Luine
- Department of Psychology, Hunter College of CUNY, New York, NY, USA.
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Wang TJ, Chen JR, Wang WJ, Wang YJ, Tseng GF. Genistein partly eases aging and estropause-induced primary cortical neuronal changes in rats. PLoS One 2014; 9:e89819. [PMID: 24587060 PMCID: PMC3934964 DOI: 10.1371/journal.pone.0089819] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Accepted: 01/26/2014] [Indexed: 01/11/2023] Open
Abstract
Gonadal hormones can modulate brain morphology and behavior. Recent studies have shown that hypogonadism could result in cortical function deficits. To this end, hormone therapy has been used to ease associated symptoms but the risk may outweigh the benefits. Here we explored whether genistein, a phytoestrogen, is effective in restoring the cognitive and central neuronal changes in late middle age and surgically estropause female rats. Both animal groups showed poorer spatial learning than young adults. The dendritic arbors and spines of the somatosensory cortical and CA1 hippocampal pyramidal neurons were revealed with intracellular dye injection and analyzed. The results showed that dendritic spines on these neurons were significantly decreased. Remarkably, genistein treatment rescued spatial learning deficits and restored the spine density on all neurons in the surgically estropause young females. In late middle age females, genistein was as effective as estradiol in restoring spines; however, the recovery was less thorough than on young OHE rats. Neither genistein nor estradiol rectified the shortened dendritic arbors of the aging cortical pyramidal neurons suggesting that dendritic arbors and spines are differently modulated. Thus, genistein could work at central level to restore excitatory connectivity and appears to be potent alternative to estradiol for easing aging and menopausal syndromes.
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Affiliation(s)
- Tsyr-Jiuan Wang
- Department of Nursing, National Taichung University of Science and Technology, Taichung, Taiwan
| | - Jeng-Rung Chen
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung-Hsing University, Taichung, Taiwan
| | - Wen-Jay Wang
- Department of Veterinary Medicine, College of Veterinary Medicine, National Chung-Hsing University, Taichung, Taiwan
| | - Yueh-Jan Wang
- Department of Anatomy, College of Medicine, Tzu-Chi University, Hualien, Taiwan
| | - Guo-Fang Tseng
- Department of Anatomy, College of Medicine, Tzu-Chi University, Hualien, Taiwan
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Ovariectomy and subsequent treatment with estrogen receptor agonists tune the innate immune system of the hippocampus in middle-aged female rats. PLoS One 2014; 9:e88540. [PMID: 24551115 PMCID: PMC3923802 DOI: 10.1371/journal.pone.0088540] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Accepted: 01/07/2014] [Indexed: 01/23/2023] Open
Abstract
The innate immune system including microglia has a major contribution to maintenance of the physiological functions of the hippocampus by permanent monitoring of the neural milieu and elimination of tissue-damaging threats. The hippocampus is vulnerable to age-related changes ranging from gene expression to network connectivity. The risk of hippocampal deterioration increases with the decline of gonadal hormone supply. To explore the impact of hormone milieu on the function of the innate immune system in middle-aged female rats, we compared mRNA expression in the hippocampus after gonadal hormone withdrawal, with or without subsequent estrogen replacement using estradiol and isotype-selective estrogen receptor (ER) agonists. Targeted profiling assessed the status of the innate immune system (macrophage-associated receptors, complement, inhibitory neuronal ligands), local estradiol synthesis (P450 aromatase) and estrogen reception (ER). Results established upregulation of macrophage-associated (Cd45, Iba1, Cd68, Cd11b, Cd18, Fcgr1a, Fcgr2b) and complement (C3, factor B, properdin) genes in response to ovariectomy. Ovariectomy upregulated Cd22 and downregulated semaphorin3A (Sema3a) expression, indicating altered neuronal regulation of microglia. Ovariectomy also led to downregulation of aromatase and upregulation of ERα gene. Of note, analogous changes were observed in the hippocampus of postmenopausal women. In ovariectomized rats, estradiol replacement attenuated Iba1, Cd11b, Fcgr1a, C3, increased mannose receptor Mrc1, Cd163 and reversed Sema3a expression. In contrast, reduced expression of aromatase was not reversed by estradiol. While the effects of ERα agonist closely resembled those of estradiol, ERβ agonist was also capable of attenuating the expression of several macrophage-associated and complement genes. These data together indicate that the innate immune system of the aging hippocampus is highly responsive to the gonadal hormone milieu. In ovariectomized female rats, estradiol replacement exerts potent immunomodulatory effects including attenuation of microglia sensitization, initiation of M2-like activation and modulation of complement expression by targeting hippocampal neurons and glial cells through ERα and ERβ.
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43
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Hawley WR, Grissom EM, Moody NM, Dohanich GP, Vasudevan N. Activation of G-protein-coupled receptor 30 is sufficient to enhance spatial recognition memory in ovariectomized rats. Behav Brain Res 2014; 262:68-73. [PMID: 24445074 DOI: 10.1016/j.bbr.2014.01.006] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 01/04/2014] [Accepted: 01/07/2014] [Indexed: 11/27/2022]
Abstract
In ovariectomized rats, administration of estradiol, or selective estrogen receptor agonists that activate either the α or β isoforms, have been shown to enhance spatial cognition on a variety of learning and memory tasks, including those that capitalize on the preference of rats to seek out novelty. Although the effects of the putative estrogen G-protein-coupled receptor 30 (GPR30) on hippocampus-based tasks have been reported using food-motivated tasks, the effects of activation of GPR30 receptors on tasks that depend on the preference of rats to seek out spatial novelty remain to be determined. Therefore, the aim of the current study was to determine if short-term treatment of ovariectomized rats with G-1, an agonist for GPR30, would mimic the effects on spatial recognition memory observed following short-term estradiol treatment. In Experiment 1, ovariectomized rats treated with a low dose (1 μg) of estradiol 48 h and 24 h prior to the information trial of a Y-maze task exhibited a preference for the arm associated with the novel environment on the retention trial conducted 48 h later. In Experiment 2, treatment of ovariectomized rats with G-1 (25 μg) 48 h and 24 h prior to the information trial of a Y-maze task resulted in a greater preference for the arm associated with the novel environment on the retention trial. Collectively, the results indicated that short-term treatment of ovariectomized rats with a GPR30 agonist was sufficient to enhance spatial recognition memory, an effect that also occurred following short-term treatment with a low dose of estradiol.
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Affiliation(s)
- Wayne R Hawley
- Department of Psychology, Tulane University, New Orleans, LA 70118, United States.
| | - Elin M Grissom
- Department of Psychology, Tulane University, New Orleans, LA 70118, United States
| | - Nicole M Moody
- Program in Neuroscience, Tulane University, New Orleans, LA 70118, United States
| | - Gary P Dohanich
- Department of Psychology, Tulane University, New Orleans, LA 70118, United States; Program in Neuroscience, Tulane University, New Orleans, LA 70118, United States
| | - Nandini Vasudevan
- Program in Neuroscience, Tulane University, New Orleans, LA 70118, United States; Department of Cellular and Molecular Biology, Tulane University, New Orleans, LA 70118, United States
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