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Journal of Steroid Biochemistry and Molecular Biology

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https://www.readbyqxmd.com/read/28323044/medium-doses-of-vitamin-d-decrease-falls-and-higher-doses-of-daily-vitamin-d3-increase-falls-a-randomized-clinical-trial
#1
Lynette M Smith, Gallagher J Christopher, Suiter Corinna
Falls are a serious health problem in the aging population. Because low levels of vitamin D have been associated with increased fall rates, many trials have been performed with vitamin D; two meta-analyses showed either a small effect or no effect of vitamin D on falls. We conducted a study of the effect of vitamin D on serum 25 hydroxyvitamin D (25OHD) and data on falls was collected as a secondary outcome. In a 12-month double blind randomized placebo trial, elderly women, mean age 66 years, were randomized to one of seven daily oral doses of vitamin D or placebo...
March 17, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28323043/high-dose-vitamin-d-may-improve-lower-urinary-tract-symptoms-in-postmenopausal-women
#2
Johanna Oberg, Margareta Verelst, Rolf Jorde, Kevin Cashman, Guri Grimnes
Lower urinary tract symptoms (LUTS) are common in postmenopausal women, and have been reported inversely associated with vitamin D intake and serum 25-hydroxyvitamin D (25(OH)D levels. The aim of this study was to investigate if high dose vitamin D supplementation would affect LUTS in comparison to standard dose. In a randomized controlled study including 297 postmenopausal women with low bone mineral density, the participants were allocated to receive capsules of 20 000 IU of vitamin D3 twice a week (high dose group) or similar looking placebo (standard dose group)...
March 17, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28323042/comparison-of-intravaginal-0-5-prasterone-0-3mg-conjugated-estrogens-and-10%C3%AE-g-estradiol-on-estrogen-related-symptoms-of-vulvovaginal-atrophy
#3
REVIEW
David F Archer, Fernand Labrie, Marlene Montesino, Céline Martel
The objective is to compare the effect of intravaginal dehydroepiandrosterone (DHEA, prasterone), conjugated equine estrogens (CEE) and estradiol (E2) on moderate to severe dyspareunia and/or vaginal dryness. In a review of available data, independent prospective, randomized, double-blind and placebo-controlled Phase III 12-week clinical trials involved daily administration of 6.5mg (0.50%) prasterone, daily (21days on/7days off) 0.3mg CEE, twice weekly 0.3mg CEE or 10 μg E2 daily for 2 weeks followed by twice weekly for 10 weeks...
March 17, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28323045/vitamin-d-receptor-gene-polymorphisms-among-emirati-patients-with-type-2-diabetes-mellitus
#4
Habiba Al Safar, Sarah El Hajj Chehadeh, Laila Abdel-Wareth, Afrozul Haq, Herbert F Jelinek, Gehad ElGhazali, Fatme Al Anouti
At a prevalence rate close to 19.5%, the UAE has one of the highest rates of Type 2 Diabetes Mellitus (T2DM) in the world. Genome wide association studies (GWAS) have led to the identification of several genetic variants that are associated with T2DM. Recently, genes involved in vitamin D metabolism have gained interest because of the association between vitamin D deficiency (VDD) and increased risk for T2DM. Among these, the Vitamin D receptor (VDR) gene is a good candidate for T2DM susceptibility. The aim of this study was to investigate the association between VDR polymorphisms and T2DM among a representative sample of the Emirati population...
March 16, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28315792/oxysterols-players-in-different-metabolic-leagues
#5
EDITORIAL
Dieter Lütjohann, Gérard Lizard, Luigi Iuliano
No abstract text is available yet for this article.
March 15, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28315391/quality-assessment-of-vitamin-d-metabolite-assays-used-by-clinical-and-research-laboratories
#6
G D Carter, J Berry, R Durazo-Arvizu, E Gunter, G Jones, J Jones, H L J Makin, P Pattni, K W Phinney, C T Sempos, E L Williams
The Vitamin D External Quality Assessment Scheme (DEQAS) was launched in 1989 and monitors the performance of 25-hydroxyvitamin D (25-OHD) and 1,25- dihydroxyvitamin D (1,25(OH)2D) assays. In April 2015 a pilot scheme for 24,25-dihydroxyvitamin D (24,25(OH)2D) was introduced. The 25-OHD scheme is accuracy - based with target values assigned by the NIST Reference Measurement Procedure (RMP) for 25-OHD2 and 25-OHD3. A similar method is used to assign values for 3-epi-25-OHD. Five samples of human serum are distributed quarterly to over 1000 participants in 58 countries (April 2016) and clinical laboratories are expected to submit results within approximately 5 weeks...
March 14, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28300625/potential-prevention-by-oral-dhea-of-superficial-tears-in-elderly-atrophy-skin
#7
Harry W Daniell
No abstract text is available yet for this article.
March 11, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28300624/neurotoxicity-of-the-steroidal-alkaloids-tomatine-and-tomatidine-is-rip1-kinase-and-caspase-independent-and-involves-the-eif2%C3%AE-branch-of-the-endoplasmic-reticulum
#8
Daniela Correia da Silva, Paula B Andrade, Patrícia Valentão, David M Pereira
Steroidal alkaloids are a class of natural products that occur in several species of the Solanaceae family. In the case of tomato plant (Lycopersicon esculentum Mill.), tomatine and its aglycone, tomatidine, are the most representative molecules. These steroidal alkaloids have already shown several potentially useful biological activities, from anticancer to anti-inflammatory or antibacterial. In this work, the toxicity of these molecules in neuronal cells, namely in the neuroblastoma cell line SH-SY5Y, was assessed, emphasis being given to the cellular mechanisms underlying the effects observed...
March 11, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28286207/virtual-screening-applications-in-short-chain-dehydrogenase-reductase-research
#9
REVIEW
Katharina R Beck, Teresa Kaserer, Daniela Schuster, Alex Odermatt
Several members of the short-chain dehydrogenase/reductase (SDR) enzyme family play fundamental roles in adrenal and gonadal steroidogenesis as well as in the metabolism of steroids, oxysterols, bile acids, and retinoids in peripheral tissues, thereby controlling the local activation of their cognate receptors. Some of these SDRs are considered as promising therapeutic targets, for example to treat estrogen-/androgen-dependent and corticosteroid-related diseases, whereas others are considered as anti-targets as their inhibition may lead to disturbances of endocrine functions, thereby contributing to the development and progression of diseases...
March 9, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28285018/design-synthesis-and-biological-properties-of-seco-d-ring-modified-1%C3%AE-25-dihydroxyvitamin-d3-analogues
#10
Marcin Szybinski, Katarzyna Sektas, Rafal R Sicinski, Lori A Plum, Jadwiga Frelek, Hector F DeLuca
As a continuation of our efforts directed to the structure-activity relationship studies of vitamin D compounds, we present in this paper the synthesis of new analogues of 1α,25-(OH)2D3 characterized by numerous structural modifications, especially a cleaved D ring. Total synthesis of the CD fragment required for the construction of the target vitamins was based on the Stork approach. The structure of the key intermediate - bicyclic hydroxy lactone - was established by crystallographic and electronic circular dichroism (ECD) spectral analysis...
March 8, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28285017/effects-of-the-aryl-hydrocarbon-receptor-agonist-3-methylcholanthrene-on-the-17%C3%AE-estradiol-regulated-mrna-transcriptome-of-the-rat-uterus
#11
Janina Helle, Annekathrin M Keiler, Oliver Zierau, Peggy Dörfelt, Günter Vollmer, Leane Lehmann, Sridar V Chittur, Martin Tenniswood, JoEllen Welsh, Georg Kretzschmar
Polycyclic aromatic hydrocarbons (PAHs) are products of incomplete combustion of organic compounds, abundant in exhaust fumes and cigarette smoke. They act by binding to the aryl hydrocarbon receptor (AHR) which induces expression of phase 1 and phase 2 enzymes in the liver. PAH induced AHR activation may also lead to adverse effects by modulating other pathways, for example estrogen receptor (ER) signaling in the female reproductive tract. We have investigated the effects of the PAH 3-methylcholanthrene (3-MC) on 17β-estradiol (E2) dependent signaling in the uterus of ovariectomized rats to characterize the cross talk between AHR and ER on an mRNA transcriptome wide scale...
March 8, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28285016/gper-modulators-opportunity-nox-on-the-heels-of-a-class-akt
#12
Eric R Prossnitz
The (patho)physiology of estrogen and its receptors is complex. It is therefore not surprising that therapeutic approaches targeting this hormone include stimulation of its activity through supplementation with either the hormone itself or natural or synthetic agonists, inhibition of its activity through the use of antagonists or inhibitors of its synthesis, and tissue-selective modulation of its activity with biased ligands. The physiology of this hormone is further complicated by the existence of at least three receptors, the classical nuclear estrogen receptors α and β (ERα and ERβ), and the 7-transmembrane G protein-coupled estrogen receptor (GPER/GPR30), with overlapping but distinct pharmacologic profiles, particularly of anti-estrogenic ligands...
March 8, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28274746/transcription-factors-sf1-and-cjun-cooperate-to-activate-the-fdx1-promoter-in-ma-10-leydig-cells
#13
Pauline Roumaud, Arlette Rwigemera, Luc J Martin
The Ferredoxin 1 (FDX1) protein supports steroid biosynthesis in steroidogenic cells through electron transfer to the rate-limiting steroidogenic enzyme, CYP11A1. The latter catalyzes the conversion of cholesterol to pregnenolone through side chain cleavage inside the mitochondria. Thus far, only several transcription factors have been implicated in the regulation of mouse Fdx1 promoter activity in Leydig cells. These include the nuclear receptor SF1 and SP1. Since two conserved regulatory elements for AP1 transcription factors have been located at -764 and -617bp of the Fdx1 promoter, we hypothesized that cJUN may cooperate with other partners to regulate Fdx1 in Leydig cells...
March 6, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28267642/fundamental-studies-of-adrenal-retinoid-x-receptor-protein-isoform-tissue-expression-subcellular-distribution-and-ligand-availability
#14
Behling Cheng, Fatema H Al-Shammari, Isra'a A Ghader, Fatima Sequeira, Jitendra Thakkar, Thazhumpal C Mathew
Adrenal gland reportedly expresses many nuclear receptors that are known to heterodimerize with retinoid-X-receptor (RXR) for functions, but the information regarding the glandular RXR is not adequate. Studies of rat adrenal homogenate by Western blotting revealed three RXR proteins: RXRα (55kDa), RXRβ (47kDa) and RXR (56kDa). RXRγ was not detectable. After fractionation, RXRα was almost exclusively localized in the nuclear fraction. In comparison, substantial portions of RXRβ and RXR were found in both nuclear and post-nuclear particle fractions, suggesting genomic and non-genomic functions...
March 3, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28263910/depressive-like-effect-of-prenatal-exposure-to-ddt-involves-global-dna-hypomethylation-and-impairment-of-gper1-esr1-protein-levels-but-not-esr2-and-ahr-arnt-signaling
#15
Malgorzata Kajta, Agnieszka Wnuk, Joanna Rzemieniec, Ewa Litwa, Wladyslaw Lason, Agnieszka Zelek-Molik, Irena Nalepa, Zofia Rogóż, Adam Grochowalski, Anna K Wojtowicz
Several lines of evidence suggest that exposures to Endocrine Disrupting Chemicals (EDCs) such as pesticides increase the risks of neuropsychiatric disorders. Despite extended residual persistence of dichlorodiphenyltrichloroethane (DDT) in the environment, the mechanisms of perinatal actions of DDT that could account for adult-onset of depression are largely unknown. This study demonstrated the isomer-specific induction of depressive-like behavior and impairment of Htr1a/serotonin signaling in one-month-old mice that were prenatally exposed to DDT...
March 2, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28259640/structural-basis-for-inhibition-of-17%C3%AE-hydroxysteroid-dehydrogenases-by-phytoestrogens-the-case-of-fungal-17%C3%AE-hsdcl
#16
Alberto Cassetta, Jure Stojan, Ivet Krastanova, Katja Kristan, Mojca Brunskole Švegelj, Doriano Lamba, Tea Lanišnik Rižner
Phytoestrogens are plant-derived compounds that functionally and structurally mimic mammalian estrogens. Phytoestrogens have broad inhibitory activities toward several steroidogenic enzymes, such as the 17β-hydroxysteroid dehydrogenases (17β-HSDs), which modulate the biological potency of androgens and estrogens in mammals. However, to date, no crystallographic data are available to explain phytoestrogens binding to mammalian 17β-HSDs. NADP(H)-dependent 17β-HSD from the filamentous fungus Cochliobolus lunatus (17β-HSDcl) has been the subject of extensive biochemical, kinetic and quantitative structure-activity relationship studies that have shown that the flavonols are the most potent inhibitors...
March 1, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28245981/rapid-uptake-biotransformation-esterification-and-lack-of-depuration-of-testosterone-and-its-metabolites-by-the-common-mussel-mytilus-spp
#17
Tamar I Schwarz, Ioanna Katsiadaki, Benjamin H Maskrey, Alexander P Scott
The presence of the vertebrate steroids, testosterone (T) and 17β-estradiol in mollusks is often cited as evidence that they are involved in the control of their reproduction. In this paper, we show that a likely source of T in at least one species, the common mussel (Mytilus spp.), is from uptake from water. When mussels were exposed to waterborne tritiated T ([(3)H]-T) in a closed container, the radioactivity decreased rapidly and exponentially until, by 24h, approximately 35% remained in the water. The rate of uptake of radiolabel could not be saturated by concentrations as high as 16...
February 27, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28242261/specific-interactions-between-vitamin-d-receptor-and-its-ligands-ab-initio-molecular-orbital-calculations-in-water
#18
Ryosuke Takeda, Ittetsu Kobayashi, Kanako Shimamura, Hiromi Ishimura, Ryushi Kadoya, Kentaro Kawai, Atsushi Kittaka, Midori Takimoto-Kamimura, Noriyuki Kurita
Vitamin D is recognized to play important roles not only in the bone metabolism and the regulation of Ca amount in the blood but also in the onset of immunological diseases. These physiological actions caused by vitamin D are triggered by the specific interaction between vitamin D receptor (VDR) and vitamin D. In the present study, we investigated the interactions between VDR and vitamin D derivatives using ab initio molecular simulation, in order to elucidate the reason for the significant difference in their effects on VDR activity...
February 27, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28249728/gper-is-involved-in-the-functional-liaison-between-breast-tumor-cells-and-cancer-associated-fibroblasts-cafs
#19
Rosamaria Lappano, Marcello Maggiolini
The aggressiveness of breast tumors is deeply influenced by the surrounding stroma. In this regard, the functional crosstalk between cancer cells and the tumor microenvironment has received considerable attention in recent years. Cancer-associated fibroblasts (CAFs) are active components of the tumor stroma as they play a main role in the initiation, progression, metastasis and recurrence of breast malignancy. Hence, a better understanding of the mechanisms through which host stroma may contribute to cancer development would lead to novel therapeutic approaches aimed to target both tumor cells and the adjacent microenvironment...
February 26, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28242262/vitamin-d-assays-in-clinical-laboratory-past-present-and-future-challenges
#20
Shereen H Atef
Vitamin D status is usually assessed by measuring the serum 25-hydroxyvitamin D (25(OH)D) concentration. There has been a dramatic increase in 25-OHD requests over recent years prompting many laboratories to consider the use of automated immunoassays. In this presentation, we will discuss and compare the two major techniques that are used for measuring of vitamin D (the binding assay and chemical assay techniques). Chemiluminescence immunoassays (CLIA), radioimmunoassy (RIA), and binding protein assay are belonging to the binding assay, while the chemical assay includes high performance liquid chromatography (HPLC) and liquid chromatography-tandem mass spectrometry (LC-MS/MS)...
February 24, 2017: Journal of Steroid Biochemistry and Molecular Biology
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