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https://www.readbyqxmd.com/read/29220539/significance-and-mechanism-of-androgen-receptor-ar-overexpression-and-ar-mtor-crosstalk-in-hepatocellular-carcinoma
#1
Hong Zhang, Xiaoxing Li, Yang Yang, Yanjie Zhang, Hui-Yun Wang, X F Steven Zheng
Hepatocellular carcinoma (HCC) is a male-dominant cancer and androgen receptor (AR) has been linked to the pathogenesis of HCC. However, AR expression and its precise role in HCC remain controversial. Moreover, previous anti-androgen and -AR clinical trials in HCC failed to demonstrate clinical benefits. In this study, we found that AR is overexpressed in the nucleus of approximately 37% HCC tumors, which is significantly associated with advanced disease stage and poor survival. AR overexpression in HCC cells markedly alters AR-dependent transcriptome, stimulates oncogenic growth and determines therapeutic response to enzalutamide, a second generation of AR antagonist...
December 8, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/29220533/androgens-irregular-menses-and-risk-of-diabetes-and-coronary-artery-calcification-in-the-diabetes-prevention-program
#2
Catherine Kim, Vanita R Aroda, Ronald B Goldberg, Naji Younes, Sharon L Edelstein, MaryLou Carrion-Petersen, David A Ehrmann
Context: It is unclear whether relative elevations in androgens or irregular menses (IM) are associated with greater cardiometabolic risk among women who are already overweight and glucose intolerant. Research Design and Methods: We conducted a secondary analysis of Diabetes Prevention Program (DPP) and the DPP Outcomes Study (DPPOS). Participants included women with sex hormone measurements who did not use exogenous estrogen (n=1422). We examined whether free androgen index (FAI) or IM were associated with diabetes risk during the DPP/DPPOS or with coronary artery calcification (CAC) at DPPOS year 10...
December 6, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29217733/sex-as-a-biological-variable-in-preclinical-imaging-research-initial-observations-with-18f-fluorothymidine
#3
Szeman Ruby Chan, Kelley Salem, Justin Jeffery, Ginny L Powers, Yongjun Yan, Kooresh I Shoghi, Aparna M Mahajan, Amy M Fowler
The study objective was to investigate whether sex influences 3'-deoxy-3'-[18F]fluorothymidine (18F-FLT) uptake and tissue distribution in mouse models of cancer. Methods:18F-FLT biodistribution was measured in three strains of male and female mice (129S6/SvEv, athymic nude, and BALB/c). 18F-Fluoro-2-deoxy-2-D-glucose (18F-FDG) biodistribution was performed for comparison. 18F-FLT uptake was also measured in female 129S6/SvEv mice bearing estrogen-dependent SSM3 mouse mammary tumors, male athymic nude mice bearing androgen-dependent CWR22 prostate cancer xenografts, and male and female athymic nude mice bearing estrogen-independent MDA-MB-231 human breast cancer xenografts...
December 7, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/29216881/risks-benefits-size-and-clinical-implications-of-combined-oral-contraceptive-use-in-women-with-polycystic-ovary-syndrome
#4
REVIEW
Sebastião Freitas de Medeiros
BACKGROUND: Polycystic ovary syndrome (PCOS) is a complex condition with high risk for dyslipidemia, dysglycemia, venous thromboembolism, cardiovascular disease and metabolic syndrome. Because the combined oral contraceptive (COC) use has also been associated with impaired fasting glucose, insulin resistance and increased risk of thromboembolism disease, it is rationale to think that the combination of oral contraceptive and PCOS could make it worse or increase the risks. OBJECTIVE: To examine the current data regarding potential additional risks and benefits of contraceptive use, highlights the major gap in knowledge for designing future studies and, when possible, suggests an adequate COC formulation for a determined PCOS phenotype...
December 8, 2017: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/29216878/adaptive-phenotype-drives-resistance-to-androgen-deprivation-therapy-in-prostate-cancer
#5
Nicoletta Ferrari, Ilaria Granata, Matteo Capaia, Marina Piccirillo, Mario Rosario Guarracino, Roberta Venè, Antonella Brizzolara, Andrea Petretto, Elvira Inglese, Martina Morini, Simonetta Astigiano, Adriana Agnese Amaro, Francesco Boccardo, Cecilia Balbi, Paola Barboro
BACKGROUND: Prostate cancer (PCa), the second most common cancer affecting men worldwide, shows a broad spectrum of biological and clinical behaviour representing the epiphenomenon of an extreme heterogeneity. Androgen deprivation therapy is the mainstay of treatment for advanced forms but after few years the majority of patients progress to castration-resistant prostate cancer (CRPC), a lethal form that poses considerable therapeutic challenges. METHODS: Western blotting, immunocytochemistry, invasion and reporter assays, and in vivo studies were performed to characterize androgen resistant sublines phenotype in comparison to the parental cell line LNCaP...
December 8, 2017: Cell Communication and Signaling: CCS
https://www.readbyqxmd.com/read/29216521/the-use-of-palliative-medications-before-death-from-prostate-cancer-swedish-population-based-study-with-a-comparative-overview-of-european-data
#6
Magdalena Lycken, Linda Drevin, Hans Garmo, Pär Stattin, Jan Adolfsson, Ingela Franck Lissbrant, Lars Holmberg, Anna Bill-Axelson
BACKGROUND: Symptoms of terminal cancer have previously been reported as undertreated. The aim of this study was to assess the use of palliative medications before death from prostate cancer. METHODS: This Swedish register study included men who died from 2009 to 2012 with prostate cancer as the underlying cause of death. We assessed the proportion who collected a prescription of androgen deprivation therapy, non-steroidal anti-inflammatory drugs, paracetamol, opioids, glucocorticoids, antidepressants, anxiolytics and sedative-hypnotics and the differences in treatment related to age, time since diagnosis, educational level, close relatives and comorbidities...
December 4, 2017: European Journal of Cancer
https://www.readbyqxmd.com/read/29216406/high-throughput-h295r-steroidogenesis-assay-utility-as-an-alternative-and-a-statistical-approach-to-characterize-effects-on-steroidogenesis
#7
Derik E Haggard, Agnes L Karmaus, Matthew T Martin, Richard S Judson, R Woodrow Setzer, Katie Paul Friedman
The U.S. Environmental Protection Agency Endocrine Disruptor Screening Program and the Organization for Economic Co-operation and Development (OECD) have used the human adrenocarcinoma (H295R) cell-based assay to predict chemical perturbation of androgen and estrogen production. Recently, a high-throughput H295R (HT-H295R) assay was developed as part of the ToxCast program that includes measurement of 11 hormones, including progestagens, corticosteroids, androgens, and estrogens. To date, 2012 chemicals have been screened at one concentration; of these, 656 chemicals have been screened in concentration-response...
December 1, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29216311/amelioration-of-sexual-behavior-and-motor-activity-deficits-in-a-castrated-rodent-model-with-a-selective-androgen-receptor-modulator-sarm-2f
#8
Megumi Morimoto, Yuichiro Amano, Masahiro Oka, Ayako Harada, Hisashi Fujita, Yukiko Hikichi, Ryuichi Tozawa, Masuo Yamaoka, Takahito Hara
Sarcopenia and cachexia present characteristic features of a decrease in skeletal muscle mass and strength, anorexia, and lack of motivation. Treatments for these diseases have not yet been established, although selective androgen receptor modulators (SARMs) are considered as therapeutic targets. We previously reported that a novel SARM compound, SARM-2f, exhibits anabolic effect on muscles, with less stimulatory effect on prostate weight compared with testosterone, in rat Hershberger assays and cancer cachexia models...
2017: PloS One
https://www.readbyqxmd.com/read/29215767/exposure-to-levonorgestrel-increases-nest-acquisition-success-and-decreases-sperm-motility-in-the-male-fathead-minnow-pimephales-promelas
#9
Tyler Frankel, Lance Yonkos, Franklin Ampy, Jack Frankel
Progestins are utilized as a component of human contraceptives, and enter the environment via wastewater treatment plant effluent. Certain progestins activate fish androgen receptors and cause decreases in fecundity and masculinization of females. In this study, a nest acquisition assay and computer assisted sperm analysis (CASA) was used to examine the effects of levonorgestrel (LNG) on male fathead minnow (Pimephales promelas) reproductive fitness. Males were exposed to 0, 10, or 100ng/L LNG for 14d. Combinations of a control male and a male from one of the treatments were placed into a competitive nesting assay, and time each male spent holding the nest and time spent exhibiting aggressive behaviors were analyzed at 48hrs post-exposure...
December 7, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29215592/natural-korean-medicine-dang-gui-biosynthesis-effective-extraction-and-formulations-of-major-active-pyranocoumarins-their-molecular-action-mechanism-in-cancer-and-other-biological-activities
#10
REVIEW
Chinreddy Subramanyam Reddy, Seong Cheol Kim, Mok Hur, Yeon Bok Kim, Chun Geon Park, Woo Moon Lee, Jae Ki Jang, Sung Cheol Koo
Angelica gigas Nakai (AGN) is a crucial oriental medicinal herb that grows especially in Korea and the Far-East countries. It contains chemically active compounds like pyranocoumarins, polyacetylenes and essential oils, which might be useful for treatment of several chronic diseases. It has been used for centuries as a traditional medicine in Southeast Asia, but in Western countries is used as a functional food and a major ingredient of several herbal products. The genus Angelica is also known as 'female ginseng' due to its critical therapeutic role in female afflictions, such as gynecological problems...
December 7, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29214797/high-throughput-in-vitro-data-to-inform-prioritization-of-ambient-water-monitoring-and-testing-for-endocrine-active-chemicals
#11
Wendy J Heiger-Bernays, Susanna Wegner, David Dix
The presence of industrial chemicals, consumer product chemicals, and pharmaceuticals is well documented in waters in the US and globally. Most of these chemicals lack health-protective guidelines and many have been shown to have endocrine bioactivity. There is currently no systematic or national prioritization for monitoring waters for chemicals with endocrine disrupting activity. We propose Ambient Water Bioactivity Concentrations (AWBCs) generated from high throughput data as a health-based screen for endocrine bioactivity of chemicals in water...
December 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29214744/exposure-to-cadmium-during-gestation-and-lactation-affects-development-and-function-of-leydig-cells-in-male-offspring
#12
Huajian Tian, Shaomin Chen, Yang Leng, Teng Li, Zengli Li, Hongxia Chen, Qihao Zhang
Toxic effects of maternal exposure to Cadmium (Cd) on Leydig cells of male offspring arises much concern recently, but its toxic effects on the development of Leydig cells and androgen synthesis have not been elucidated. In this study, female rats were exposed to Cd during gestation and lactation, and the development of Leydig cells in the first filial-generation (F1) male rats was investigated. The steroidogenic signaling pathway and biomarkers related to the development of Leydig cells were detected to disclose how maternal Cd-exposure caused reproductive damage...
December 7, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/29214729/finasteride-inhibited-brain-dopaminergic-system-and-open-field-behaviors-in-adolescent-male-rats
#13
Li Li, Yun-Xiao Kang, Xiao-Ming Ji, Ying-Kun Li, Shuang-Cheng Li, Xiang-Jian Zhang, Hui-Xian Cui, Ge-Ming Shi
AIMS: Finasteride inhibits the conversion of testosterone to dihydrotestosterone. Because androgen regulates dopaminergic system in the brain, it could be hypothesized that finasteride may inhibit dopaminergic system. The present study therefore investigates the effects of finasteride in adolescent and early developmental rats on dopaminergic system, including contents of dopamine and its metabolites (dihydroxy phenyl acetic acid and homovanillic acid) and tyrosine hydroxylase expressions both at gene and protein levels...
December 6, 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29214142/molecular-mechanisms-of-enzalutamide-resistance-in-prostate-cancer
#14
REVIEW
Zoran Culig
Purpose of Review: Compensatory mechanisms leading to increased androgen receptor expression and activity after androgen ablation or anti-androgen treatment have been identified in prostate cancer. After hydroxyflutamide and bicalutamide were used in therapy of prostate cancer over many years, novel anti-androgen enzalutamide showed improved clinical activity. However, enzalutamide resistance develops over a certain time period, and molecular mechanisms responsible for this process are heterogeneous...
2017: Current Molecular Biology Reports
https://www.readbyqxmd.com/read/29213237/effectiveness-of-deferred-combined-androgen-blockade-therapy-predicts-efficacy-in-abiraterone-acetate-treated-metastatic-castration-resistant-prostate-cancer-patients-after-docetaxel
#15
Jian-Ri Li, Kun-Yuan Chiu, Shian-Shiang Wang, Cheng-Kuang Yang, Chuan-Shu Chen, Hao-Chung Ho, Chi-Feng Hung, Chen-Li Cheng, Chi-Rei Yang, Cheng-Che Chen, Shu-Chi Wang, Chia-Yen Lin, Chao-Hsiang Chang, Chiann-Yi Hsu, Yen-Chuan Ou
Introduction: Conventional anti-androgen regimens were widely used as an initiation or combined androgen blockade (CAB) therapy in advanced prostate cancer patients. Currently, new androgen pathway inhibitors such as abiraterone acetate (AA) and enzalutamide had been proven effective in metastatic castration resistant prostate cancer. In this study, we attempt to analyze the role of conventional anti-androgen drugs as deferred CAB therapy in castration-resistant prostate cancer patients. Materials and Methods: From 2012 to 2017, 48 metastatic castration-resistant prostate cancer (CRPC) patients who received sequential treatments with primary androgen blockade, oral anti-androgen regimens, and docetaxel followed by AA treatment were included...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29212868/painful-testicular-metastasis-from-prostate-adenocarcinoma
#16
Karla A Lee, Erik Mayer, Vincent Khoo
A 60-year-old man presented with unilateral testicular pain and urinary frequency. His presenting prostate-specific antigen (PSA) was 100 ng/mL, and a biopsy revealed Gleason 4+4 prostate adenocarcinoma. The significance of his initial PSA was somewhat complicated by possible prostatitis and early initiation of bicalutamide. PSA rose on two occasions prior to radiotherapy but coincided with a flare of testicular pain on one of these. Whole-body staging diffusion-weighted MRI scan was negative. He was treated with 3 years of androgen deprivation therapy (ADT) and radical radiotherapy...
December 5, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29212707/inherent-steroid-17%C3%AE-20-lyase-activity-in-defunct-cytochrome-p450-17a-enzymes
#17
Eric Gonzalez, Kevin M Johnson, Pradeep S Pallan, Thanh T N Phan, Wei Zhang, L I Lei, Zdzislaw Wawrzak, Francis K Yoshimoto, Martin Egli, F Peter Guengerich
Cytochrome P450 (P450) 17A1 catalyzes the oxidations of progesterone and pregnenolone and is the major source of androgens. The enzyme catalyzes both 17α-hydroxylation and a subsequent 17α, 20-lyase reaction, and several mechanisms have been proposed for the latter step. Zebrafish P450 17A2 catalyzes only the 17α-hydroxylations. We previously reported high similarity of the crystal structures of zebrafish P450 17A1 and 17A2 and human P450 17A1 (Pallan et al. (2015) J. Biol. Chem. 290, 3248- 3268). Five residues near the heme, which differed, were changed...
December 6, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29212226/transcribed-ultraconserved-region-uc-63-promotes-resistance-to-docetaxel-through-regulation-of-androgen-receptor-signaling-in-prostate-cancer
#18
Yohei Sekino, Naoya Sakamoto, Keisuke Goto, Ririno Honma, Yoshinori Shigematsu, Kazuhiro Sentani, Naohide Oue, Jun Teishima, Akio Matsubara, Wataru Yasui
Docetaxel is the standard chemotherapy for metastatic castration-resistant prostate cancer (CRPC). However, nearly all patients ultimately become refractory due to the development of docetaxel resistance. The transcribed ultraconserved regions (T-UCRs) are a novel class of non-coding RNAs that are absolutely conserved across species and are involved in carcinogenesis including prostate cancer (PC). In this study, we investigated the transcriptional levels of 26 representative T-UCRs and determined the regions that were differentially expressed in PC...
November 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/29212159/lef1-tfe3-and-ar-are-putative-diagnostic-markers-of-solid-pseudopapillary-neoplasms
#19
Eun Kyung Kim, Mi Jang, Minhee Park, Hoguen Kim
The diagnosis of solid pseudopapillary neoplasms (SPNs) is challenging because some SPNs share many similar morphological and immunohistochemical features with other pancreatic neoplasms. In this study, we investigated potential diagnostic markers of SPN. Based on the SPN-specific upregulated genes from a previous DNA microarray and proteome study, we selected six immunohistochemical markers [beta-catenin, androgen receptor (AR), lymphoid enhancer-binding factor 1 (LEF1), transcription factor for immunoglobulin heavy-chain enhancer 3 (TFE3), fused in sarcoma (FUS), and WNT inhibitory factor 1 (WIF-1)]...
November 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/29211901/corrigendum-for-low-dose-dihydrotestosterone-drives-metabolic-dysfunction-via-cytosolic-and-nuclear-hepatic-androgen-receptor-mechanisms
#20
(no author information available yet)
No abstract text is available yet for this article.
December 1, 2017: Endocrinology
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