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Steroid hormone

Nick Zwart, Shan Li Nio, Corine J Houtman, Jacob De Boer, Jeroen Kool, Timo Hamers, Marja H Lamoree
Effect-Directed Analysis (EDA) is a commonly used approach for effect-based identification of endocrine disruptive chemicals in complex (environmental) mixtures. For routine toxicity assessment of e.g. water samples however, current EDA approaches are considered time consuming and laborious. We achieved faster EDA and identification, by downscaling of sensitive cell-based hormone reporter gene assays and increasing fractionation resolution to allow testing of smaller fractions with reduced complexity. The high-resolution EDA approach is demonstrated by analysis of four environmental passive sampler extracts...
March 16, 2018: Environmental Science & Technology
Manas Panigrahi, Manoranjitha Kumari, Sudhindra Vooturi
Background: The diagnosis of lymphocytic hypophysitis (LYH) is a clinical challenge. Medical management with steroids may result in complete resolution of the symptoms and radiological features. We report our approach to the diagnosis and treatment of LYH. Materials and Methods: Retrospective analysis of data of nine consecutive patients of LYH from August 2013 to August 2015 was done. The average age of the study population was 38.4 ± 19.8 years, with five (55...
March 2018: Neurology India
Salvatore Sutti, Frank Tacke
Drug-induced liver injury (DILI) remains a clinical challenge due to the poorly predictable outcomes. Accordingly, considerable efforts have been devoted to unravel the risk factors responsible for DILI worsening toward acute liver failure (ALF), liver transplantation (LT), and/or death. From a pathogenic point of view, exhaustion of drug metabolizing pathways, cell death mechanisms, activation of local immune cells, such as Kupffer cells, and recruitment of inflammatory leukocytes including monocytes and lymphocytes are key drivers of DILI progression...
March 15, 2018: Clinical Science (1979-)
Inger Sundström-Poromaa
From a psychological perspective, the menstrual cycle has been a research topic for more than 50 years. The most recent menstrual cycle research has been driven by an increased interest in sex differences in neuroscience, and the urge to understand sex disparities in prevalence, clinical presentation, and treatment response in psychiatric or neurologic disorders. Indeed, the menstrual cycle is an excellent model of ovarian steroid influence on emotion, behavior, and cognition. This review summarizes the emotion-related and cognitive findings of methodologically sound menstrual cycle studies...
2018: Vitamins and Hormones
Chia-Hong Chou, Mei-Jou Chen
Ovarian follicular cell undergoes extensive proliferation and differentiation during the period that the follicle evolved from the primordial state to its ovulatory phase and then corpus luteum status. During this process, different and various levels of steroid hormones in follicular fluid, or obtained from circulation and adjacent cells as granulosa and theca cells, or from environment and diet will all affect the process of follicular growth and development. Differential steroid hormones might have differential effects on ovarian folliculogenesis via the effect on granulosa cell growth and follicular fluid formation that involves cell proliferation, apoptosis, and angiogenesis within the follicle...
2018: Vitamins and Hormones
JoAnne S Richards
The "ovarian cycle" is an exquisite and dynamic endocrine system that includes ovarian events, hypothalamic-pituitary interactions, uterine endometrial and myometrial changes during implantation and pregnancy, cervical alterations in structure, and breast development. The ovarian cycle and the steroid hormones produced by the ovary also impact epithelial cancer development in the ovary, uterus, cervix, and breast. This chapter provides a personal view of recent developments that occur in this complex endocrine environment...
2018: Vitamins and Hormones
Annalisa Trenti, Serena Tedesco, Carlotta Boscaro, Lucia Trevisi, Chiara Bolego, Andrea Cignarella
Estrogen plays an important role in the regulation of cardiovascular physiology and the immune system by inducing direct effects on multiple cell types including immune and vascular cells. Sex steroid hormones are implicated in cardiovascular protection, including endothelial healing in case of arterial injury and collateral vessel formation in ischemic tissue. Estrogen can exert potent modulation effects at all levels of the innate and adaptive immune systems. Their action is mediated by interaction with classical estrogen receptors (ERs), ERα and ERβ, as well as the more recently identified G-protein coupled receptor 30/G-protein estrogen receptor 1 (GPER1), via both genomic and non-genomic mechanisms...
March 15, 2018: International Journal of Molecular Sciences
Yuko Arita, Michael Kirk, Neha Gupta, Ramkumar Menon, Darios Getahun, Morgan R Peltier
OBJECTIVE: Tributyltin (TBT) is a persistent pollutant but its effects on placental function are poorly understood as are its possible interactions with infection. We hypothesized that TBT alters the production of sex hormones and biomarkers for inflammation and neurodevelopment in an infection-dependent manner. METHODS: Placental explant cultures were treated with 0-5000 nM TBT in the presence and absence of Escherichia coli. A conditioned medium was harvested and concentrations of steroids (progesterone, P4; testosterone, T and estradiol, E2) as well as biomarkers of inflammation [interleukin (IL)-1β (IL-1β), tumor necrosis factor (TNF-α), IL-10, IL-6, soluble glycoprotein 130 (sgp-130) and heme oxygenase-1 (HO-1)], oxidative stress [8-iso-prostaglandin (8-IsoP)] and neurodevelopment [brain-derived neurotrophic factor (BDNF)] were quantified...
March 15, 2018: Journal of Perinatal Medicine
Do-Hwan Lim, Seungjae Lee, Jee Yun Han, Min-Seok Choi, Jae-Sang Hong, Youngmo Seong, Young-Soo Kwon, Young Sik Lee
The steroid hormone ecdysone has a central role in the developmental transitions of insects through its control of responsive protein-coding and microRNA (miRNA) gene expression. However, the complete regulatory network controlling the expression of these genes remains to be elucidated. In this study, we performed cross-linking immunoprecipitation coupled with deep sequencing of endogenous Argonaute 1 (Ago1) protein, the core effector of the miRNA pathway, in Drosophila S2 cells. We found that regulatory interactions between miRNAs and their cognate targets were substantially altered by Ago1 in response to ecdysone signaling...
March 15, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
M G Carta, A Preti, H S Akiskal
Human population is increasing in immense cities with millions of inhabitants, in which life is expected to run 24 hours a day for seven days a week (24/7). Noise and light pollution are the most reported consequences, with a profound impact on sleep patterns and circadian biorhythms. Disruption of sleep and biorhythms has severe consequences on many metabolic pathways. Suppression of melatonin incretion at night and the subsequent effect on DNA methylation may increase the risk of prostate and breast cancer...
2018: Clinical Practice and Epidemiology in Mental Health: CP & EMH
Jeffery M Vahrenkamp, Chieh-Hsiang Yang, Adriana C Rodriguez, Aliyah Almomen, Kristofer C Berrett, Alexis N Trujillo, Katrin P Guillen, Bryan E Welm, Elke A Jarboe, Margit M Janat-Amsbury, Jason Gertz
Steroid hormone receptors are simultaneously active in many tissues and are capable of altering each other's function. Estrogen receptor α (ER) and glucocorticoid receptor (GR) are expressed in the uterus, and their ligands have opposing effects on uterine growth. In endometrial tumors with high ER expression, we surprisingly found that expression of GR is associated with poor prognosis. Dexamethasone reduced normal uterine growth in vivo; however, this growth inhibition was abolished in estrogen-induced endometrial hyperplasia...
March 13, 2018: Cell Reports
Gang Wang, Jing Liang, Zishan Jia, Lei Wan, Mingxia Yang
RATIONALE: Spinal cord infarction is one of the complications of epidural steroid injections (ESIs), but has only been reported in cervical vertebra by transforaminal injection and lumbar vertebra by transforaminal injection; and up to now, there is no reporting about spinal cord infarction caused by caudal injection. Here, we report a case. PATIENT CONCERNS: A 52-year-old man was admitted to our hospital. He was diagnosed as lumbar disc herniation in other hospital, and the patient suffered bilateral lower limb motor and sensory disorders after administration of caudal ESI...
March 2018: Medicine (Baltimore)
Éverton L Vogt, Jorge F A Model, Anapaula S Vinagre
Organotins (OTs) are considered some of the most toxic chemicals introduced into aquatic environments by anthropogenic activities. They are widely used for agricultural and industrial purposes and as antifouling additives on boat hull's paints. Even though the use of OTs was banned in 2008, elevated levels of OTs can still be detected in aquatic environments. OTs' deleterious effects upon wildlife and experimental animals are well documented and include endocrine disruption, immunotoxicity, neurotoxicity, genotoxicity, and metabolic dysfunction...
2018: Frontiers in Endocrinology
Sara Falvo, Gabriella Chieffi Baccaria, Giuseppe Spaziano, Luigi Rosati, Massimo Venditti, Maria Maddalena Di Flore, Alessandra Santillo
The Harderian gland (HG) of the rat (Rattus norvegicus) secretes copious amounts of lipids, such as cholesterol. Here we report a study of the expressions of the StAR protein and key steroidogenic enzymes in the HG of male and female rats. The objective of the present investigation was to ascertain (a) whether the rat HG is involved in steroid production starting with cholesterol, and (b) whether the pattern of gene and protein expressions together with the enzymatic activities display sexual dimorphism. The results demonstrate, for the first time, the expression of StAR gene and protein, and Cyp11a1, Hsd3b1, Hsd17b3, Srd5a1, Srd5a2 and Cyp19a1 genes in the rat HG...
March 10, 2018: Comptes Rendus Biologies
Natalia Pascuali, Leopoldina Scotti, Mariana Di Pietro, Gonzalo Oubiña, Diana Bas, María May, Antonio Gómez Muñoz, Patricia S Cuasnicú, Débora J Cohen, Marta Tesone, Dalhia Abramovich, Fernanda Parborell
STUDY QUESTION: Is ceramide-1-phosphate (C1P) an ovarian protective agent during alkylating chemotherapy? SUMMARY ANSWER: Local administration of C1P drastically reduces ovarian damage induced by cyclophosphamide (Cy) via protection of follicular reserve, restoration of hormone levels, inhibition of apoptosis and improvement of stromal vasculature, while protecting fertility, oocyte quality and uterine morphology. WHAT IS KNOWN ALREADY: Cancer-directed therapies cause accelerated loss of ovarian reserve and lead to premature ovarian failure (POF)...
March 9, 2018: Human Reproduction
Takumi Oti, Keiko Takanami, Saya Ito, Takashi Ueda, Ken Ichi Matsuda, Mitsuhiro Kawata, Jintetsu Soh, Osamu Ukimura, Tatsuya Sakamoto, Hirotaka Sakamoto
The gastrin-releasing peptide (GRP) system in the lumbosacral spinal cord controls male sexual function in rats. In contrast, in female rats, GRP neurons could scarcely be detected around puberty when circulating ovarian steroid hormones such as estradiol and progesterone levels are increasing. However, little information is available on feminizing or demasculinizing effects of ovarian steroids on the central nervous system in female puberty and adulthood. In this study, to visualize the spinal GRP neurons in vivo, we have generated a GRP-promoter-Venus transgenic (Tg) rat line, and studied the effects of the sex steroid hormones on GRP expression in the rat lumbar cord by examining the Venus fluorescence...
March 8, 2018: Endocrinology
Z K Smith, A J Thompson, J P Hutcheson, W T Nichols, B J Johnson
Crossbred beef steers (n = 240; 12 pens/treatment; initial BW = 305 ± 17.7 kg) were used in a randomized block design feedlot study to evaluate the influence of coated trenbolone acetate (TBA) and estradiol-17β (E2) implants (Merck Animal Health, Madison, NJ) on gain performance, carcass traits, and sera metabolites. The five treatments were no implant (NI), Revalor-XR on d 0 [200 mg TBA + 20 mg E2 (coated); XR], Revalor-XS on d 0 [200 mg TBA + 40 mg E2 (total): 80 mg TBA + 16 mg E2 (non-coated) and 120 mg TBA + 24 mg E2 (coated); XS], Revalor-200 on d 0 [200 mg TBA + 20 mg E2 (non-coated); E200], or Revalor-200 on d 70 (D200)...
March 9, 2018: Journal of Animal Science
Úna C Mc Menamin, Andrew T Kunzmann, Michael B Cook, Brian T Johnston, Liam J Murray, Andrew D Spence, Marie M Cantwell, Chris R Cardwell
Incidence of upper gastrointestinal cancers of the oesophagus and stomach show a strong unexplained male predominance. Hormonal and reproductive factors have been associated with upper gastrointestinal cancers in women but there is little available data on men. To investigate this, we included 219,425 men enrolled in the UK Biobank in 2006-2010. Baseline assessments provided information on hormonal and reproductive factors (specifically hair baldness, number of children fathered, relative age at first facial hair and relative age voice broke) and incident oesophageal or gastric cancers were identified through linkage to UK cancer registries...
March 13, 2018: International Journal of Cancer. Journal International du Cancer
Ulrich Hohmann, Julia Santiago, Joël Nicolet, Vilde Olsson, Fabio M Spiga, Ludwig A Hothorn, Melinka A Butenko, Michael Hothorn
Plant-unique membrane receptor kinases with leucine-rich repeat ectodomains (LRR-RKs) can sense small molecule, peptide, and protein ligands. Many LRR-RKs require SERK-family coreceptor kinases for high-affinity ligand binding and receptor activation. How one coreceptor can contribute to the specific binding of distinct ligands and activation of different LRR-RKs is poorly understood. Here we quantitatively analyze the contribution of SERK3 to ligand binding and activation of the brassinosteroid receptor BRI1 and the peptide hormone receptor HAESA...
March 12, 2018: Proceedings of the National Academy of Sciences of the United States of America
Xueping Hu, Bin Yin, Kaat Cappelle, Luc Swevers, Guy Smagghe, Xinling Yang, Li Zhang
Insect growth is regulated by the steroid hormone 20-hydroxyecdysone (20E), which works via the ecdysone receptor (EcR). To identify biologically active and novel ecdysone agonists/antagonists, ligand/structure-based virtual screening combined with pharmacophore modeling and molecular docking was performed to identify novel nonsteroidal lead compounds. Nine molecules were screened and selected for an in vitro cell-based reporter bioassay. The results showed that VS-006 and VS-009 exhibited antagonistic activity in S2 cells, whereas only VS-006 exhibited antagonistic activity in Bm5 cells...
March 2, 2018: Journal of Molecular Graphics & Modelling
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