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Z R Shafigullina, L I Velikanova, N V Vorokhobina, S B Shustov, A A Lisitsin, E V Malevanaia, M O Buinova, E A Bessonova, D O Kirsanov
No abstract text is available yet for this article.
April 21, 2018: Steroids
Minju Joy, Kajal Chakraborty
The estuarine Corbiculid bivalve black clam, Villorita cyprinoides collected from the Southwestern coastline regions of Arabian Sea are significant resources of nutritional and bioactive pluralities. The purification of ethyl acetate:methanol (EtOAc:MeOH) extract of V. cyprinoides characterized a previously undisclosed specialized abeo-pregnane-type sterol derivative 19 (10→5) abeo-20-methyl-pregn-10-en-3β-yl-hex-(3'E)-enoate (1) along with two cholestenols (22E),(241 E)-241 ,242 -dihomocholesta-5,22,241 -trien-3β-ol (2) and (22E)-241 -homocholesta-5,22-dien-(3β,241 β)-diol (3)...
April 20, 2018: Steroids
Bilge Debeleç-Bütüner, Mert Burak Öztürk, Özgür Tağ, İsmail Hakkı Akgün, Günay Yetik-Anacak, Erdal Bedir, Kemal Sami Korkmaz
Chronic inflammation is associated to 25% of cancer cases according to epidemiological data. Therefore, inhibition of inflammation-induced carcinogenesis can be an efficient therapeutic approach for cancer chemoprevention in drug development studies. It is also determined that anti-inflammatory drugs reduce cancer incidence. Cell culture-based in vitro screening methods are used as a fast and efficient method to investigate the biological activities of the biomolecules. In addition, saponins are molecules that are isolated from natural sources and are known to have potential for tumor inhibition...
April 17, 2018: Steroids
Hussein F Sakr, Abdelaziz M Hussein, Elsayed A Eid, Mahmoud AlKhateeb
AIMS: To investigate the effects of testosterone (Test) deficiency and testosterone replacement therapy (TRT) on the development of non-alcoholic fatty liver disease (NAFLD) and associated peripheral insulin resistance (IR) in male rats and to illustrate the underlying mechanisms of action. MATERIALS AND METHODS: male Sprague Dawley rats were divided into 3 groups as follows: 1) sham-operated group (n=11), 2) ORCD-induced group (n=9) exposed to orchidectomy (ORCD), achieved by complete surgical removal of testicles, and 3) ORCD+ Test treated group (n=10) (11 ng/ mL Test propionate, 3x/week, S...
April 16, 2018: Steroids
Anam Ansari, Abad Ali, Mohd Asif, Mohd Ahmar Rauf, Mohammad Owais, Shamsuzzaman
A series of steroidal oxazole and thiazole derivatives have been synthesized employing thiosemicarbazide/semicarbazide hydrochloride and ethyl 2-chloroacetoacetate with a simple and facile one-pot multicomponent reaction pathway. The antimicrobial activity of newly synthesized compounds were evaluated against four bacterial strains namely Gram-negative (Escherechia coli and Pseudomonas aeruginosa) and Gram-positive bacteria (Staphylococcus aureus and Listeria monocytogenes) in addition to pathogenic fungi (Candida albicans and Cryptococcus neoformans)...
April 10, 2018: Steroids
Hongyun Li, Xuebin Zhang, Shanmei Shen, Yan Zhang, Wenjing Zhang, Wenhuan Feng, Ping Li, Dalong Zhu
Adrenal venous sampling (AVS) is the reference standard for primary aldosteronism (PA) subtyping. Cortisol is widely used to assess the success of selective AVS, but it is not always reliable. The aim of the present study was to investigate the usefulness of adrenal androgens, compared to cortisol, in assessing the selectivity of AVS. We consecutively recruited 37 patients with PA undergoing AVS. AVS procedures were performed with the bilateral simultaneous technique without cosyntropin stimulation. We collected two baseline blood samples from 10 patients with a 15-min interval between time -15 (t-15) and time 0 (t0) to measure the variability in the levels of the tested hormones over time...
April 10, 2018: Steroids
Mariailaria Verderame, Rosaria Scudiero
Estrogen receptors alpha (ERα) and beta (ERβ) are transcription factors known to be involved in the regulation of many complex physiological processes in mammals. They are expressed primarily in the reproductive tract of all vertebrates females, thus indicating important and conserved functions in female reproductive success. ERs are also present in physiological different tissues as bone, brain, liver, skin and adipose tissues, in both females and males. In the latter, ERs have been found also in the genital tract, supporting the findings of a complex role for estrogen in spermatogenesis and, more generally, in male reproduction...
April 5, 2018: Steroids
Diana Montes-Grajales, Esperanza Martínez-Romero, Jesus Olivero-Verbel
Breast cancer is a highly heterogeneous disease influenced by the hormonal microenvironment and the most common malignancy in women worldwide. Some phytoestrogens and mycoestrogens have been epidemiologically linked as risk factors or protectors, however their mechanisms of action are complex and not fully understood. The aim of this study was to predict the potential of 36 natural xenoestrogens to interact with 189 breast cancer proteins using AutoDock Vina. In order to validate our protocol, an in silico docking pose and binding site determination was compared with the crystallographic structure and the power of prediction to distinguish between ligand and decoys was evaluated though a receiver operating characteristic curve (ROC) of the resultant docking affinities and in vitro data...
March 30, 2018: Steroids
Andrea R Nikolić, Ivana Z Kuzminac, Suzana S Jovanović-Šanta, Dimitar S Jakimov, Lidija D Aleksić, Marija N Sakač
Steroidal 16,17-seco-16,17a-dinitriles possessing 4-ene-3,6-dione (3), 6-methylene-4-en-3-one (5), (6E)-hydroxyimino-4-en-3β-ol (9) or (6E)-hydroxyimino-4-en-3-one (10) moiety were synthesized starting from 3β-acetoxy-16,17-secoandrost-4-ene-16,17a-dinitrile (1). Antiproliferative activity of the newly synthesized compounds, as well as previously synthesized 3-oxo-16,17-secoandrosta-1,4-diene-16,17a-dinitrile (VII), was tested in vitro. Compound 9 displayed submicromolar antiproliferative activity against human cervical carcinoma (HeLa) cells (IC50 0...
March 28, 2018: Steroids
Richard J Pietras
Dr. Clara M. Szego passed away recently at the age of 101. She was a pioneer in the study of steroid hormone action, particularly the role of estrogens in target tissues. She was first to report on steroid hormone binding with proteins in the circulation in 1946. This observation led to a Ciba Foundation Award of the Endocrine Society in 1953. Claire then followed the steroid hormone and reported on interactions with membrane-associated and nuclear proteins in target cells of the reproductive tract and breast...
March 27, 2018: Steroids
Frank Surup, Sandra Halecker, Manfred Nimtz, Sara Rodrigo, Barbara Schulz, Michael Steinert, Marc Stadler
A virulent culture of Hymenoscyphus fraxineus, the causal agent of ash dieback, was investigated for its production of secondary metabolites in a 70 L batch fermentation. Chemical analysis of the mycelial extract by means of flash chromatography and preparative HPLC led to the isolation of a new ergostane-type steroid (1) and a new related lanostane triterpenoid (2), both revealing the same glycosylation pattern. While their planar structures were elucidated by HR-ESIMS and NMR data, relative stereochemistry was assigned by ROESY correlations in conjunction with H,H and C,H coupling constants...
March 23, 2018: Steroids
Anita Kiss, Bianka Edina Herman, Tamás Görbe, Erzsébet Mernyák, Barnabás Molnár, János Wölfling, Mihály Szécsi, Gyula Schneider
The regioselective Cu(I)-catalyzed 1,3-dipolar cycloaddition of 17α- and 17β-azidoandrost-5-en-3β-ol epimers (3b and 5b) with different terminal alkynes afforded novel 1,4-substituted triazolyl derivatives (8a-k and 9a-k). For the preparation of 5'-iodo-1',2',3'-triazoles (8m-n and 9m-n), an improved method was developed, directly from steroidal azides and terminal alkynes, in reaction mediated by CuI and ICl as iodinating agents. Acetolysis and subsequent hydrolysis of 8n and 9n yielded 5'-hydroxy-1',2',3'-triazoles 8o and 9o...
March 22, 2018: Steroids
Yongtao Bai, Lihua Song, Guoliang Dai, Meijuan Xu, Lijing Zhu, Weidong Zhang, Wen Jing, Wenzheng Ju
Evidence showed that the stress hormone corticosterone (CORT) injection resulted in dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis implicated in major depressive disorder. Magnolol, main constituent identified in the barks of Magnolia officinalis, exerted antidepressant effects in a rat model of depression induced by chronic unpredictable mild stress in previous studies. However, its antidepressant-like effects and mechanisms have never been studied in depression model induced by CORT administration in rodents...
March 16, 2018: Steroids
Fred Chasalow, Lori Pierce-Cohen
We describe a novel steroid, which we have named "Ionotropin." Its unique features are: [1] it has 23 carbon atoms and [2] it is a phosphocholine ester. There are no other known mammalian steroids with either structural feature. Ionotropin cross reacts with digoxin-specific antibodies and may be the long-sought, endogenous, mammalian digoxin-like material (DLM). Using LC-MS, we identified three other phosphocholine steroids in serum. Two of these steroids also cross-react with digoxin specific antibodies...
March 14, 2018: Steroids
Sarah Kim, Daphne Foong, Mark S Cooper, Markus J Seibel, Hong Zhou
Accurate measurement of circulating glucocorticoid concentrations in rodents is often hampered by the stress-related activation of the hypothalamic-pituitary-adrenal axis during animal handling. The present study aims to identify methods of blood collection associated with minimal stress and thus artificial increases in plasma glucocorticoid levels. Using two strains of mice, we evaluated common laboratory methods of non-terminal (tail blood sampling with or without restraint; retro-orbital puncture) and terminal blood collection (cardiac puncture) and their immediate and prolonged effect on plasma corticosterone levels...
March 13, 2018: Steroids
Safaa I Tayel, Shimaa E Soliman, Hanan M Elsayed
BACKGROUND AND AIM: increasing prevalence of neonatal sepsis in recent years catch attention to early prevention and management. Vitamin D receptor (VDR) polymorphism can modulate VDR expression level that greatly influences immunity and susceptibility to microbial infections. We aimed to investigate the association of VDR polymorphism at FokI, rs2228570 T/C, and TaqI, rs731236 C/T gene with serum 25-hydroxyvitamin D level and risk of neonatal sepsis. METHODS: This work carried on 160 subjects classified into 80 cases (40 mothers and their 40 septic neonates) and 80 healthy controls (40 volunteer mothers and their 40 healthy neonates)...
March 9, 2018: Steroids
Eric P Hoffman, Valerie Riddle, Maxime A Siegler, Daniel Dickerson, Miroslav Backonja, William G Kramer, Kanneboyina Nagaraju, Heather Gordish-Dressman, Jesse M Damsker, John M McCall
BACKGROUND: Glucocorticoid drugs are highly effective anti-inflammatory agents, but chronic use is associated with extensive pharmacodynamic safety concerns that have a considerable negative impact on patient quality of life. PURPOSE: Vamorolone (VBP15) is a first-in-class steroidal multi-functional drug that shows potent inhibition of pro-inflammatory NFkB pathways via high-affinity binding to the glucocorticoid receptor, high affinity antagonism for the mineralocorticoid receptor, and membrane stabilization properties...
March 7, 2018: Steroids
Anita Kiss, Erzsébet Mernyák, János Wölfling, Izabella Sinka, István Zupkó, Gyula Schneider
The reduction of 16-hydroxymethylene-3-methoxy-13α-estra-1,3,5(10)-trien-17-one (14) and 16-hydroxymethylene-3-benzyloxy-13α-estra-1,3,5(10)-trien-17-one (16) yielded a mixture of two diastereomeric diols, the 16α-hydroxymethyl,17β-hydroxy and 16β-hydroxymethyl,17α-hydroxy isomers (17a-20a) in a ratio of 6:1. We describe a straightforward synthetic route to transform the isomers with trans functional groups attached to ring D (17a-20a) into isomers with cis functional groups (25a-28a). We determined the in vitro antiproliferative activities of compounds 17a-20a and 25a-28a by means of MTT assays against a panel of human adherent cancer cell lines HeLa, A2780, MCF-7, T47D, MDA-MB-231 and MDA-MB-361)...
March 1, 2018: Steroids
Matharage S I De Silva, Adam W Dayton, Lance R Rhoten, John W Mallett, Jared C Reese, Mathieu D Squires, Andrew P Dalley, James P Porter, Allan M Judd
In bovine adrenal zona fasciculata (ZF) and NCI-H295R cells, interleukin-6 (IL-6) increases cortisol release, increases expression of steroidogenic acute regulatory protein (StAR), cholesterol side chain cleavage enzyme (P450scc), and steroidogenic factor 1 (SF-1) (increases steroidogenic proteins), and decreases the expression of adrenal hypoplasia congenita-like protein (DAX-1) (inhibits steroidogenic proteins). In contrast, IL-6 decreases bovine adrenal zona reticularis (ZR) androgen release, StAR, P450scc, and SF-1 expression, and increases DAX-1 expression...
March 1, 2018: Steroids
Hui You, Kun Meng, Zhao-Yi Wang
Hepatocellular carcinoma (HCC) is the common primary liver cancer and the third leading cause of cancer related mortality worldwide. It is generally thought that the estrogen-signaling pathway is not related to the development and progression of human HCC. However, accumulating evidences indicate the existence of a rapid estrogen signaling in HCC cells that is able to promote cell growth. However, the receptor that mediates the rapid estrogen signaling in HCC cells has not been established. Previously, our laboratory identified a variant of ER-α, ER-α36, and found that ER-α36 mediates the rapid estrogen signaling such as the activation of the MAPK/ERK signaling in breast carcinoma cells...
February 23, 2018: Steroids
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