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https://www.readbyqxmd.com/read/29777688/proteomic-changes-during-adult-stage-in-pre-optic-hypothalamus-hippocampus-and-pituitary-regions-of-female-rat-brain-following-neonatal-exposure-to-estradiol-17%C3%AE
#1
Vijayakumar Govindaraj, Radhika Nagamangalam Shridharan, Addicam Jagannadha Rao
Although neonatal exposure to estrogen or estrogenic compounds results in irreversible changes in the brain function and reproductive abnormalities during adulthood but the underlying mechanisms are still largely unknown. The present study has attempted to compare the protein profiles of sexually dimorphic brain regions of adult female rats which were exposed to estradiol- 17β during neonatal period. The total proteins extracted from pre-optic area (POA), hypothalamus, hippocampus and pituitary of control and neonatally E2 treated female rats was subjected to 2D-SDS-PAGE and differentially expressed proteins were identification by MALDI TOF/TOF-MS...
May 16, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29765299/src-kinase-dependent-rapid-non-genomic-modulation-of-hippocampal-spinogenesis-induced-by-androgen-and-estrogen
#2
Mika Soma, Jonghyuk Kim, Asami Kato, Suguru Kawato
Dendritic spine is a small membranous protrusion from a neuron's dendrite that typically receives input from an axon terminal at the synapse. Memories are stored in synapses which consist of spines and presynapses. Rapid modulations of dendritic spines induced by hippocampal sex steroids, including dihydrotestosterone (DHT), testosterone (T), and estradiol (E2), are essential for synaptic plasticity. Molecular mechanisms underlying the rapid non-genomic modulation through synaptic receptors of androgen (AR) and estrogen (ER) as well as its downstream kinase signaling, however, have not been well understood...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29753863/sex-differences-in-the-subcellular-distribution-of-corticotropin-releasing-factor-receptor-1-in-the-rat-hippocampus-following-chronic-immobilization-stress
#3
Helena R McAlinn, Batsheva Reich, Natalina H Contoreggi, Renata Poulton Kamakura, Andreina G Dyer, Bruce S McEwen, Elizabeth M Waters, Teresa A Milner
Corticotropin releasing factor receptors (CRFR1) contribute to stress-induced adaptations in hippocampal structure and function that can affect learning and memory processes. Our prior studies showed that female rats with elevated estrogens compared to males have more plasmalemmal CRFR1 in CA1 pyramidal cells, suggesting a greater sensitivity to stress. Here, we examined the distribution of hippocampal CRFR1 following chronic immobilization stress (CIS) in female and male rats using immuno-electron microscopy...
May 10, 2018: Neuroscience
https://www.readbyqxmd.com/read/29742445/previous-estradiol-treatment-in-ovariectomized-mice-provides-lasting-enhancement-of-memory-and-brain-estrogen-receptor-activity
#4
Kevin J Pollard, Haley D Wartman, Jill M Daniel
No abstract text is available yet for this article.
May 6, 2018: Hormones and Behavior
https://www.readbyqxmd.com/read/29741891/a-c-estrogens-as-potent-and-selective-estrogen-receptor-beta-agonists-serbas-to-enhance-memory-consolidation-under-low-estrogen-conditions
#5
Alicia M Hanson, K L Iresha Sampathi Perera, Jaekyoon Kim, Rajesh K Pandey, Noreena Sweeney, Xingyun Lu, Andrea Imhoff, Alexander Craig Mackinnon, Adam J Wargolet, Rochelle M Van Hart, Karyn M Frick, William A Donaldson, Daniel S Sem
Estrogen receptor-beta (ERβ) is a drug target for memory consolidation in post-menopausal women. Herein is reported a series of potent and selective ERβ agonists (SERBAs) with in vivo efficacy that are A-C estrogens, lacking the B and D estrogen rings. The most potent and selective A-C estrogen is selective for activating ER relative to seven other nuclear hormone receptors, with a surprising 750-fold selectivity for the beta over alpha isoform, and with EC50's of 20-30 nM in cell-based and direct binding assays...
May 9, 2018: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29678475/both-oophorectomy-and-obesity-impaired-solely-hippocampal-dependent-memory-via-increased-hippocampal-dysfunction
#6
Duangkamol Mantor, Wasana Pratchayasakul, Wanitchaya Minta, Wissuta Sutham, Siripong Palee, Jirapas Sripetchwandee, Sasiwan Kerdphoo, Thidarat Jaiwongkum, Sirawit Sriwichaiin, Warunsorn Krintratun, Nipon Chattipakorn, Siriporn C Chattipakorn
Our previous study demonstrated that obesity aggravated peripheral insulin resistance and brain dysfunction in the ovariectomized condition. Conversely, the effect of obesity followed by oophorectomy on brain oxidative stress, brain apoptosis, synaptic function and cognitive function, particularly in hippocampal-dependent and hippocampal-independent memory, has not been investigated. Our hypothesis was that oophorectomy aggravated metabolic impairment, brain dysfunction and cognitive impairment in obese rats...
April 17, 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29674171/a-combinatorial-modulation-of-synaptic-plasticity-in-the-rat-medial-amygdala-by-oxytocin-urocortin3-and-estrogen
#7
Linoy Mia Frankiensztajn, Rotem Gur-Pollack, Shlomo Wagner
The medial nucleus of the amygdala (MeA) plays a pivotal role in a variety of mammalian social behaviors. Specifically, activity of the hypothalamic pro-social neuropeptide oxytocin in the MeA was shown to be crucial for social recognition memory. The MeA is also a hub of neuroendocrine activity and expresses a large number of receptors of neuropeptides and hormones. These include oxytocin receptor, estrogen receptor alpha and corticotropin-releasing factor (CRF) receptor type 2 (CRFR2). In a previous study we found that intracerebroventricular (ICV) oxytocin application to anesthetized rats promotes long-term depression (LTD) of the MeA response to electrical stimulation of its main sensory input, the accessory olfactory bulb (AOB)...
April 11, 2018: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/29670547/medications-used-for-cognitive-enhancement-in-patients-with-schizophrenia-bipolar-disorder-alzheimer-s-disease-and-parkinson-s-disease
#8
REVIEW
Wen-Yu Hsu, Hsien-Yuan Lane, Chieh-Hsin Lin
Background/aims: Cognitive impairment, which frequently occurs in patients with schizophrenia, bipolar disorder, Alzheimer's disease, and Parkinson's disease, has a significant impact on the daily lives of both patients and their family. Furthermore, since the medications used for cognitive enhancement have limited efficacy, the issue of cognitive enhancement still remains a clinically unsolved challenge. Sampling and methods: We reviewed the clinical studies (published between 2007 and 2017) that focused on the efficacy of medications used for enhancing cognition in patients with schizophrenia, bipolar disorder, Alzheimer's disease, and Parkinson's disease...
2018: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/29669258/rapid-effects-on-memory-consolidation-and-spine-morphology-by-estradiol-in-female-and-male-rodents
#9
REVIEW
Victoria Luine, Peter Serrano, Maya Frankfurt
Rapid, neurosteroid-like effects of estrogens on memory consolidation during recognition memory tasks in both male and female rodents are described. We discuss how these mnemonic changes are related to rapid estrogenic effects on dendritic spine density, the distribution of spine types and the expression of PSD95 and GluA2 within spines in the hippocampus and medial prefrontal cortex, two areas critical for learning and memory. Overall, these data lead to the conclusion that estrogens are capable of exerting rapid and potent influences on memory and spine morphology in both sexes...
April 15, 2018: Hormones and Behavior
https://www.readbyqxmd.com/read/29643079/age-at-menopause-and-lifetime-cognition-findings-from-a-british-birth-cohort-study
#10
Diana Kuh, Rachel Cooper, Adam Moore, Marcus Richards, Rebecca Hardy
OBJECTIVE: We investigated whether cognitive performance between ages 43 and 69 years was associated with timing of menopause, controlling for hormone replacement therapy, childhood cognitive ability, and sociobehavioral factors. METHODS: We used data from 1,315 women participating in the Medical Research Council National Survey of Health and Development (a British birth cohort study) with known age at period cessation and up to 4 assessments of verbal memory (word-learning task) and processing speed (letter-cancellation task) at ages 43, 53, 60-64, and 69...
April 11, 2018: Neurology
https://www.readbyqxmd.com/read/29605460/impairment-of-learning-and-memory-performances-induced-by-bpa-evidences-from-the-literature-of-a-moa-mediated-through-an-ed
#11
REVIEW
Sakina Mhaouty-Kodja, Luc P Belzunces, Marie-Chantal Canivenc, Henri Schroeder, Cécile Chevrier, Elodie Pasquier
Many rodent studies and a few non-human primate data report impairments of spatial and non-spatial memory induced by exposure to bisphenol A (BPA), which are associated with neural modifications, particularly in processes involved in synaptic plasticity. BPA-induced alterations involve disruption of the estrogenic pathway as established by reversal of BPA-induced effects with estrogenic receptor antagonist or by interference of BPA with administered estradiol in ovariectomised animals. Sex differences in hormonal impregnation during critical periods of development and their influence on maturation of learning and memory processes may explain the sexual dimorphism observed in BPA-induced effects in some studies...
March 29, 2018: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29572476/linear-and-inverted-u-shaped-dose-response-functions-describe-estrogen-effects-on-hippocampal-activity-in-young-women
#12
Janine Bayer, Jan Gläscher, Jürgen Finsterbusch, Laura H Schulte, Tobias Sommer
In animals, 17-beta-estradiol (E2) enhances hippocampal plasticity in a dose-dependent, monotonically increasing manner, but this relationship can also exhibit an inverted U-shaped function. To investigate E2's dose-response function in the human hippocampus, we pharmacologically increased E2 levels in 125 naturally cycling women (who were in their low-hormone menstruation phase) to physiological (equivalent to menstrual cycle peak) and supraphysiological (equivalent to levels during early pregnancy) concentrations in a placebo-controlled design...
March 23, 2018: Nature Communications
https://www.readbyqxmd.com/read/29570448/a-comparative-study-of-the-effect-of-stress-on-the-cognitive-parameters-in-women-with-increased-body-mass-index-before-and-after-menopause
#13
M B Ramesh, S Ammu, A K Nayanatara, N A Vinodini, K C Pratik, N Anupama, K Bhagyalakshmi
BACKGROUND: The increasing prevalence of overweight and obesity is a critical public health problem for women. The negative effect of stress on memory and cognitive functions has been widely explored for decades in numerous research projects using a wide range of methodology. Deterioration of memory and other brain functions is a hallmark of Alzheimer's disease. Estrogen fluctuations and withdrawal have myriad direct effects on the central nervous system that have the potential to influence cognitive functions...
March 23, 2018: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/29558207/low-dose-brain-estrogen-prevents-menopausal-syndrome-while-maintaining-the-diversity-of-the-gut-microbiomes-in-estrogen-deficient-rats
#14
Sunmin Park, Da Sol Kim, Eun Seon Kang, Da Bin Kim, Suna Kang
We evaluated the effects of intracerebroventricular administration(ICV) of brain estrogen and progesterone on menopausal symptoms and their effects on the secretion of follicle-stimulating hormone(FSH) and luteinizing hormone(LH) in estrogen-deficient rats. Three weeks after ovariectomy(OVX) or Sham-operation, OVX rats were given ICV infusions of either 17β-estradiol(4 μg/day; ICV-E), progesterone(0.8 μg/day; ICV-P), or vehicle(control) for 4 weeks. OVX rats in the positive-control group were orally provided 150 μg 17β-estradiol/kg bw/day...
March 20, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29555375/neuroestrogens-rapidly-shape-auditory-circuits-to-support-communication-learning-and-perception-evidence-from-songbirds
#15
REVIEW
Daniel M Vahaba, Luke Remage-Healey
Steroid hormones, such as estrogens, were once thought to be exclusively synthesized in the ovaries and enact transcriptional changes over the course of hours to days. However, estrogens are also locally synthesized within neural circuits, wherein they rapidly (within minutes) modulate a range of behaviors, including spatial cognition and communication. Here, we review the role of brain-derived estrogens (neuroestrogens) as modulators within sensory circuits in songbirds. We first present songbirds as an attractive model to explore how neuroestrogens in auditory cortex modulate vocal communication processing and learning...
March 16, 2018: Hormones and Behavior
https://www.readbyqxmd.com/read/29551430/long-term-effects-of-gonadotropin-releasing-hormone-agonists-and-add-back-in-adolescent-endometriosis
#16
Jenny Sadler Gallagher, Stacey A Missmer, Mark D Hornstein, Marc R Laufer, Catherine M Gordon, Amy D DiVasta
STUDY OBJECTIVE: To explore the potential occurrence of long-term side effects and tolerability of gonadotropin-releasing hormone agonist (GnRHa) plus 2 different add-back regimens in adolescent patients with endometriosis. DESIGN: Follow-up questionnaire sent in 2016 to patients who participated in a drug trial between 2008 and 2012. SETTING: Tertiary care center in Boston, Massachusetts. PARTICIPANTS: Female adolescents with surgically confirmed endometriosis (n = 51) who enrolled in a GnRHa plus add-back trial as adolescents...
March 15, 2018: Journal of Pediatric and Adolescent Gynecology
https://www.readbyqxmd.com/read/29529524/estradiol-and-luteinizing-hormone-regulate-recognition-memory-following-subchronic-phencyclidine-evidence-for-hippocampal-gaba-action
#17
Alexander J Riordan, Ari W Schaler, Jenny Fried, Tracie A Paine, Janice E Thornton
The cognitive symptoms of schizophrenia are poorly understood and difficult to treat. Estrogens may mitigate these symptoms via unknown mechanisms. To examine these mechanisms, we tested whether increasing estradiol (E) or decreasing luteinizing hormone (LH) could mitigate short-term episodic memory loss in a phencyclidine (PCP) model of schizophrenia. We then assessed whether changes in cortical or hippocampal GABA may underlie these effects. Female rats were ovariectomized and injected subchronically with PCP...
May 2018: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/29522854/chronic-amyloid-%C3%AE-oligomer-infusion-evokes-sustained-inflammation-and-microglial-changes-in-the-rat-hippocampus-via-nlrp3
#18
Csaba Fekete, Csaba Vastagh, Ádám Dénes, Erik Hrabovszky, Gábor Nyiri, Imre Kalló, Zsolt Liposits, Miklós Sárvári
Microglia are instrumental for recognition and elimination of amyloid β1-42 oligomers (AβOs), but the long-term consequences of AβO-induced inflammatory changes in the brain are unclear. Here, we explored microglial responses and transciptome-level inflammatory signatures in the rat hippocampus after chronic AβO challenge. Middle-aged Long Evans rats received intracerebroventricular infusion of AβO or vehicle for 4 weeks, followed by treatment with artificial CSF or MCC950 for the subsequent 4 weeks...
March 6, 2018: Neuroscience
https://www.readbyqxmd.com/read/29514592/effects-of-isoflavones-on-behavior-estradiol-glutamate-and-gaba-levels-in-intact-middle-aged-female-rats
#19
Thaísa Meira Sandini, Thiago Marinho Reis-Silva, Natalia Moreira, Maria Martha Bernardi, Ivo Lebrun, Helenice de Souza Spinosa
OBJECTIVES: Estrogen and phytoestrogens, mainly isoflavones (SIF) treatment has been suggested to improve mood, behavior, and cognitive function in postmenopausal women. However, there is a lack of information on the mechanism of such treatment on the central nervous system. We used rats to investigate the effects of long-term treatment with commercial isoflavones on behavior, hormones, and brain neurotransmitter levels. METHODS: Intact female middle-aged (12 months) rats received 50, 100, and 200 mg/kg/day of commercial isoflavones extract by gavage for 90 days...
March 7, 2018: Nutritional Neuroscience
https://www.readbyqxmd.com/read/29505099/higher-levels-of-kallikrein-8-in-female-brain-may-increase-the-risk-for-alzheimer-s-disease
#20
Kathy Keyvani, Yvonne Münster, Nirup K Kurapati, Sebastian Rubach, Andreas Schönborn, Emre Kocakavuk, Mohamed Karout, Pia Hammesfahr, Ya-Chao Wang, Dirk M Hermann, Sarah Teuber-Hanselmann, Arne Herring
Women seem to have a higher vulnerability to Alzheimer's disease (AD), but the underlying mechanisms of this sex dichotomy are not well understood. Here, we first determined the influence of sex on various aspects of Alzheimer's pathology in transgenic CRND8 mice. We demonstrate that beta-amyloid (Aβ) plaque burden starts to be more severe around P180 (moderate disease stage) in female transgenics when compared to males and that aging aggravates this sex-specific difference. Furthermore, we show that female transgenics suffer from higher levels of neurovascular dysfunction around P180, resulting in impaired Aβ peptide clearance across the blood-brain-barrier at P360...
March 5, 2018: Brain Pathology
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