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https://www.readbyqxmd.com/read/28549324/salinity-and-sensitivity-to-endocrine-disrupting-chemicals-a-comparison-of-reproductive-endpoints-in-small-bodied-fish-exposed-under-different-salinities
#1
Thijs Bosker, Giacomo Santoro, Steven D Melvin
The influence of salinity on toxicity outcomes has been demonstrated for various contaminants, but has received limited attention for endocrine disrupting chemicals (EDCs). Short-term laboratory tests using small-bodied fish are an important tool for evaluating impacts of EDCs on reproduction. Tests have been developed for both freshwater and estuarine/marine species, providing an opportunity to assess whether concentrations at which small-bodied fish respond to EDCs may be influenced by salinity. We conducted a semi-quantitative review of short-term laboratory tests with small-bodied fish exposed to EDCs, including 59 studies under freshwater conditions (7 species) and 23 studies conducted under saline conditions (5 species)...
May 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28511915/altered-ionic-currents-and-amelioration-by-igf-1-and-pacap-in-motoneuron-derived-cells-modelling-sbma
#2
Aura M Jiménez Garduño, Leon J Juárez-Hernández, María J Polanco, Laura Tosatto, Daniela Michelatti, Daniele Arosio, Manuela Basso, Maria Pennuto, Carlo Musio
Spinal and bulbar muscular atrophy (SBMA), also known as Kennedy's disease, is a motor neuron disease caused by the expansion of a polymorphic CAG tandem repeat encoding a polyglutamine (polyQ) tract in the androgen receptor (AR) gene. SBMA is triggered by the binding of mutant AR to its natural ligands, testosterone and dihydrotestosterone (DHT). To investigate the neuronal alterations of motor neuron cell models of SBMA, we applied patch-clamp methods to verify how polyQ expansions in the AR alter cell ionic currents...
May 10, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28501574/androgen-production-in-pediatric-adrenocortical-tumors-may-occur-via-both-the-classic-and-or-the-alternative-backdoor-pathway
#3
Nesa Marti, Jana Malikova, José A Galván, Maude Aebischer, Marco Janner, Zdenek Sumnik, Barbora Obermannova, Genevieve Escher, Aurel Perren, Christa E Flück
Children with adrenocortical tumors (ACTs) often present with virilization due to high tumoral androgen production, with dihydrotestosterone (DHT) as most potent androgen. Recent work revealed two pathways for DHT biosynthesis, the classic and the backdoor pathway. Usage of alternate routes for DHT production has been reported in castration-resistant prostate cancer, CAH and PCOS. To assess whether the backdoor pathway may contribute to the virilization of pediatric ACTs, we investigated seven children suffering from androgen producing tumors using steroid profiling and immunohistochemical expression studies...
May 10, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28488586/uridine-diphosphate-glucuronosyltransferase-2b15-d85y-gene-polymorphism-is-associated-with-lower-prostate-cancer-risk-a-systematic-review-and-meta-analysis
#4
Xiao Zhong, Jiayu Feng, Ya Xiao, Pingxian Wang, Qiming Fan, Ronghua Wu, Wengang Hu, Chibing Huang
UGT2B15 (uridine diphosphate-glucuronosyltransferase 2B15) catalyzes the conversion of lipophilic C19 steroid androgens such as dihydrotestosterone (DHT) into water-soluble metabolites that can be excreted. Studies of the association between the UGT2B15 gene D85Y polymorphism and prostate cancer have yielded contradictory results. We therefore systematically searched in the PubMed, EMBASE, Science Direct/Elsevier, CNKI, and Cochrane Library databases, and identified six relevant studies with which to perform a meta-analysis of the relation between UGT2B15 D85Y polymorphism and prostate cancer risk...
April 24, 2017: Oncotarget
https://www.readbyqxmd.com/read/28486649/hyperandrogenemia-reduces-endothelium-derived-hyperpolarizing-factor-mediated-relaxation-in-mesenteric-artery-of-female-rats
#5
Jay S Mishra, Amar S More, Gary D V Hankins, Sathish Kumar
Women with polycystic ovary syndrome (PCOS) often present with hyperandrogenemia along with vascular dysfunction and elevated blood pressure. In animal models of PCOS, anti-androgen treatment decreased blood pressure, indicating a key role for androgens in the development of hypertension. However, the underlying androgen-mediated mechanism that contributes to increased blood pressure is not known. This study determined whether elevated androgens affect endothelium-derived hyperpolarizing factor (EDHF)-mediated vascular relaxation responses through alteration in function of gap junctional proteins...
May 8, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28472278/dihydrotestosterone-biochemistry-physiology-and-clinical-implications-of-elevated-blood-levels
#6
Ronald S Swerdloff, Robert E Dudley, Stephanie T Page, Christina Wang, Wael A Salameh
This review on dihydrotestosterone (DHT) biochemistry, physiology, and clinical implications of elevated levels in blood clarifies concepts that are important in clinical practice. Benefits associated with lowered serum DHT levels after 5α-reductase inhibitor (5AR-I) therapy in men have contributed to a misconception that circulating DHT levels are an important stimulus for androgenic action in target tissues (e.g., prostate). Yet evidence from clinical studies indicate that intracellular concentrations of androgens (particularly in androgen-sensitive tissues) are essentially independent of circulating levels...
May 2, 2017: Endocrine Reviews
https://www.readbyqxmd.com/read/28468774/synergy-between-androgen-receptor-antagonism-and-inhibition-of-mtor-and-her2-in-breast-cancer
#7
Michael A Gordon, Nicholas C D'Amato, Haihua Gu, Beatrice Babbs, Julia D Wulfkuhle, Emanuel F Petricoin, Isela Gallagher, Ting Dong, Kathleen Torkko, Bolin Liu, Anthony Elias, Jennifer K Richer
The androgen receptor (AR) is widely expressed in breast cancer (BC) and evidence suggests dependence on AR signaling for growth and survival. AR antagonists such as enzalutamide and seviteronel have shown success in pre-clinical models and clinical trials of prostate cancer, and are currently being evaluated in BC. Reciprocal regulation between AR and the HER2/PI3K/mTOR pathway may contribute to resistance to HER2- and mTOR-targeted therapies; thus, dual inhibition of these pathways may synergistically inhibit BC growth...
May 3, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/28467428/social-environment-during-egg-laying-changes-in-plasma-hormones-with-no-consequences-for-yolk-hormones-or-fecundity-in-female-japanese-quail-coturnix-japonica
#8
Esther M A Langen, Nikolaus von Engelhardt, Vivian C Goerlich-Jansson
The social environment can have profound effects on an individual's physiology and behaviour and on the transfer of resources to the next generation, with potential consequences for fecundity and reproduction. However, few studies investigate all of these aspects at once. The present study housed female Japanese quail (Coturnix japonica) in pairs or groups to examine the effects on hormone concentrations in plasma and yolk and on reproductive performance. Circulating levels of androgens (testosterone and 5-α-dihydrotestosterone) and corticosterone were measured in baseline samples and after standardised challenges to assess the responsiveness of the females' endocrine axes...
2017: PloS One
https://www.readbyqxmd.com/read/28457967/dhrs7-sdr34c1-a-new-player-in-the-regulation-of-androgen-receptor-function-by-inactivation-of-5%C3%AE-dihydrotestosterone
#9
Selene Araya, Denise V Kratschmar, Maria Tsachaki, Simon Stücheli, Katharina R Beck, Alex Odermatt
DHRS7 (SDR34C1) has been associated with potential tumor suppressor effects in prostate cancer; however, its function remains largely unknown. Recent experiments using purified recombinant human DHRS7 suggested several potential substrates, including the steroids cortisone and Δ4-androstene-3,17-dione (androstenedione). However, the substrate and cofactor concentrations used in these experiments were very high and the physiological relevance of these observations needed to be further investigated. In the present study, recombinant human DHRS7 was expressed in intact HEK-293 cells in order to investigate whether glucocorticoids and androgens serve as substrates at sub-micromolar concentrations and at physiological cofactor concentrations...
April 27, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28450936/the-traditional-korean-herbal-medicine-ga-gam-nai-go-hyan-suppresses-testosterone-induced-benign-prostatic-hyperplasia-by-regulating-inflammatory-responses-and-apoptosis
#10
Su-Jin Shin, Kwang-Ho Lee, Kyung-Sook Chung, Se-Yun Cheon, Hyo-Jin An
Benign prostatic hyperplasia (BPH) is a pathological condition that affects the majority of men above the age of 50 years. Pharmacological agents are typically used to treat BPH; however, there are currently no pharmacological agents that are able to completely cure BPH without causing adverse side effects. As a result of these side effects, there is a great interest in developing effective herbal medicines that are able to inhibit the progression of BPH and are safe for long-term use. Ga-Gam-Nai-Go-Hyan (GGN) is a traditional Korean herbal medicine that has been widely used to treat BPH; however, no biological studies have been performed to elucidate the efficacy of GGN...
March 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28430630/estrogen-and-androgen-converting-enzymes-17%C3%AE-hydroxysteroid-dehydrogenase-and-their-involvement-in-cancer-with-a-special-focus-on-17%C3%AE-hydroxysteroid-dehydrogenase-type-1-2-and-breast-cancer
#11
REVIEW
Erik Hilborn, Olle Stål, Agneta Jansson
Sex steroid hormones such as estrogens and androgens are involved in the development and differentiation of the breast tissue. The activity and concentration of sex steroids is determined by the availability from the circulation, and on local conversion. This conversion is primarily mediated by aromatase, steroid sulfatase, and 17β-hydroxysteroid dehydrogenases. In postmenopausal women, this is the primary source of estrogens in the breast. Up to 70-80% of all breast cancers express the estrogen receptor-α, responsible for promoting the growth of the tissue...
May 2, 2017: Oncotarget
https://www.readbyqxmd.com/read/28412653/the-relationship-between-dioxins-exposure-and-risk-of-prostate-cancer-with-steroid-hormone-and-age-in-vietnamese-men
#12
Xian Liang Sun, Teruhiko Kido, Seijiro Honma, Eitetsu Koh, Rie Okamoto, Ho Dung Manh, Shoko Maruzeni, Muneko Nishijo, Hideaki Nakagawa, Takeshi Nakano, Takumi Takasuga, Dang Duc Nhu, Nguyen Ngoc Hung, Le Ke Son
Although Vietnam's massive herbicide exposure in 1960s and 1970s was clearly injurious to health, not all causal relationships have been clarified. We therefore explored associations among dioxins, steroid hormones, age and prostate cancer risk in men. We compared serum levels of dioxin, steroid hormones and prostate specific antigen (PSA) in men aged 56-81years from herbicide-exposed hotspots (n=50) with those from non-sprayed regions (n=48). Mean serum levels of dioxin congeners in the hotspot group were 1...
October 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28410957/fetal-alpha-5-reductase-val89leu-mutation-is-associated-with-late-miscarriage
#13
Beatriz Pérez-Nevot, Jose-Luis Royo, Miriam Cortés, Ana M Lendínez, Arturo Reyes-Palomares, Ana-José Jiménez, Maximiliano Ruiz-Galdón, Armando Reyes-Engel
The present study was undertaken to determine the role of different polymorphisms affecting the testosterone/oestrogen pathway in miscarriage. Alpha 5-reductase (SRD5A2) rs523349 and rs9282858, cytochrome P450 aromatase (CYP19A1) rs4646, rs10046 and rs2236722 and oestrogen receptor (ESR1) rs9340799, rs2234693 and rs6932902 polymorphisms were selected. The case group consisted of 94 samples of formalin-fixed and paraffin-embedded fetal tissue from a miscarriage at ≤24 weeks. The control group comprised a population of 331 young healthy subjects...
March 21, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28408350/neuroactive-steroid-levels-and-psychiatric-and-andrological-features-in-post-finasteride-patients
#14
Roberto Cosimo Melcangi, Daniele Santi, Roberto Spezzano, Maria Grimoldi, Tommaso Tabacchi, Maria Letizia Fusco, Silvia Diviccaro, Silvia Giatti, Giuseppe Carrà, Donatella Caruso, Manuela Simoni, Guido Cavaletti
Recent reports show that, in patients treated with finasteride for male pattern hair loss, persistent side effects including sexual side effects, depression, anxiety and cognitive complaints may occur. We here explored the psychiatric and andrological features of patients affected by post-finasteride syndrome (PFS) and verified whether the cerebrospinal fluid (CSF) and plasma levels of neuroactive steroids (i.e., important regulators of nervous function) are modified. We found that eight out of sixteen PFS male patients considered suffered from a DSM-IV major depressive disorder (MDD)...
April 10, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28407665/enhanced-inflammation-without-impairment-of-insulin-signaling-in-the-visceral-adipose-tissue-of-5%C3%AE-dihydrotestosterone-induced-animal-model-of-polycystic-ovary-syndrome
#15
Danijela Vojnović Milutinović, Marina Nikolić, Nataša Veličković, Ana Djordjevic, Biljana Bursać, Jelena Nestorov, Ana Teofilović, Ivana Božić Antić, Jelica Bjekić Macut, Abdulbaset Shirif Zidane, Gordana Matić, Djuro Macut
Polycystic ovary syndrome is a heterogeneous endocrine and metabolic disorder associated with abdominal obesity, dyslipidemia and insulin resistance. Since abdominal obesity is characterized by low-grade inflammation, the aim of the study was to investigate whether visceral adipose tissue inflammation linked to abdominal obesity and dyslipidemia could lead to impaired insulin sensitivity in the animal model of polycystic ovary syndrome.Female Wistar rats were treated with nonaromatizable 5α-dihydrotestosterone pellets in order to induce reproductive and metabolic characteristics of polycystic ovary syndrome...
April 13, 2017: Experimental and Clinical Endocrinology & Diabetes
https://www.readbyqxmd.com/read/28404691/exemestane-and-its-active-metabolite-17-hydroexemestane-induce-udp-glucuronosyltransferase-ugt-2b17-expression-in-breast-cancer-cells
#16
Apichaya Chanawong, Peter Ian Mackenzie, Ross A McKinnon, Dong Gui Hu, Robyn Meech
Exemestane (EXE) is an aromatase inhibitor indicated for endocrine therapy of breast cancer in post-menopausal women. The primary active metabolite of EXE, 17-hydroexemestane (17-HE), is inactivated via glucuronidation, mainly by UGT2B17. UGT2B17 also has a primary role in inactivation of endogenous androgens testosterone and dihydrotestosterone (DHT) and may play an important role in regulation of breast and prostate tumour intracrinology. We recently reported that UGT2B17 could be induced by both estrogenic and androgenic ligands in breast cancer cells via binding of the estrogen receptor alpha (ERα) or the androgen receptor (AR) to a complex regulatory unit in the proximal UGT2B17 promoter...
April 12, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28403781/design-synthesis-and-biological-evaluation-of-novel-1-3-thiazolidine-2-4-diones-as-anti-prostate-cancer-agents
#17
Ramakrishnan Elancheran, Kuppusamy Saravanan, Selvaraj Divakar, Sima Kumari, V Lenin Maruthanila, Senthamarikannan Kabilan, Muthaiah Ramanathan, Rajlakshmi Devi, Jibon Kotoky
Androgen receptor (AR) is an attractive target for the treatment of prostate cancer. Structural modification and molecular docking-based virtual screening approaches were imposed to identify the novel 1,3-thiazolidine-2,4-diones (TZDs) by using Schrödinger (Maestro 9.5). The best fit molecules (3-12 & 23-31) were synthesized and characterized using spectroscopic techniques, then in vitro antioxidant and anti-prostate cancer activities were evaluated. Further, the structure of the intermediate (18) was confirmed by single crystal XRD analysis...
April 12, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28396101/the-effectiveness-of-treatments-for-androgenetic-alopecia-a-systematic-review-and-meta-analysis
#18
REVIEW
Areej Adil, Marshall Godwin
BACKGROUND: Androgenetic alopecia, or male pattern hair loss, is a hair loss disorder mediated by dihydrotestosterone, the potent form of testosterone. Currently, minoxidil and finasteride are Food and Drug Administration (FDA)-approved, and HairMax LaserComb, which is FDA-cleared, are the only treatments recognized by the FDA as treatments of androgenetic alopecia. OBJECTIVE: This systematic review and meta-analysis assesses the efficacy of nonsurgical treatments of androgenetic alopecia in comparison to placebo for improving hair density, thickness, growth (defined by an increased anagen:telogen ratio), or subjective global assessments done by patients and investigators...
April 7, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28395892/associations-of-sex-hormones-with-surface-electrocardiogram-j-point-amplitude-in-healthy-volunteers
#19
David A McNamara, Jason Ng, Leonard Ilkhanoff, Andi Schaechter, Jeffrey J Goldberger, Alan H Kadish
Gender differences in J point height exist. Previous studies suggest male sex hormones mediate effects on cardiovascular disease through myocardial repolarization. Our objective was to assess whether male and female sex hormones are associated with J point amplitude in healthy subjects. We conducted a cross-sectional study of 475 healthy, mixed racial population of men, and premenopausal women (age 33 ± 9 years, 56% male). Baseline J point amplitude (JPA) was obtained from continuous surface electrocardiograms...
June 1, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28386843/differential-expression-of-ap-1-transcription-factors-in-human-prostate-lncap-and-pc-3-cells-role-of-fra-1-in-transition-to-crpc-status
#20
K Kavya, M Naveen Kumar, Rajeshwari H Patil, Shubha M Hegde, K M Kiran Kumar, Rashmi Nagesh, R L Babu, Govindarajan T Ramesh, S Chidananda Sharma
Androgen receptor (AR) signaling axis plays a vital role in the development of prostate and critical in the progression of prostate cancer. Androgen withdrawal initially regresses tumors but eventually develops into aggressive castration-resistant prostate cancer (CRPC). Activator Protein-1 (AP-1) transcription factors are most likely to be associated with malignant transformation in prostate cancer. Hence, to determine the implication of AR and AP-1 in promoting the transition of prostate cancer to the androgen-independent state, we used AR-positive LNCaP and AR-negative PC-3 cells as an in vitro model system...
April 6, 2017: Molecular and Cellular Biochemistry
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