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https://www.readbyqxmd.com/read/29788785/impaired-serotonin-communication-during-juvenile-development-in-rats-diminishes-adult-sperm-quality
#1
Juan Díaz-Ramos, Maribel Flores-Flores, María E Ayala, Andrés Aragón-Martínez
Spermatogenesis and steroidogenesis are testicular functions regulated by gonadotrophins as well as other factors, including serotonin. Testicular serotonin acts as an autocrine regulator of testosterone secretion, but studies on its role in spermatogenesis and sperm quality are scarce. Here, we analyzed the effects of intratesticular inhibition of serotonin synthesis on gonadotrophins, testosterone, and sperm quality. Both testicles of 30-day-old rats were injected once with saline solution (SS) or distinct concentrations of p-chloroamphetamine (PCA) (0...
May 22, 2018: Systems Biology in Reproductive Medicine
https://www.readbyqxmd.com/read/29778874/simultaneous-determination-of-dihydrotestosterone-and-its-metabolites-in-mouse-sera-by-lc-ms-ms-with-chemical-derivatization
#2
Shashank Gorityala, Shuming Yang, Monica M Montano, Yan Xu
Androgens play a vital role in prostate cancer development, and their elimination and blockade are essential in the disease management. DHT is the key ligand for androgen receptor (AR) in the prostate. It is locally synthesized from testosterone. In the prostate, DHT is predominantly metabolized to α-diol and β-diol. Recent studies indicate that impaired DHT catabolism is associated with prostate cancer, signifying the necessity of a sensitive quantitative method for the determination of DHT and its metabolites...
May 16, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29775424/optimized-yeast-based-in-vitro-bioassay-for-determination-of-estrogenic-and-androgenic-activity-of-hydroxylated-methoxylated-metabolites-of-bdes-cbs-and-related-lipophilic-organic-pollutants
#3
Marek Roszko, Marta Kamińska, Krystyna Szymczyk, Katarzyna Piasecka-Jóźwiak, Beata Chabłowska
Persistent organic pollutants (POPs) are known to show endocrine disrupting (ED) activity, including interactions with hormone receptors. The aim of this work was to develop a bioassay applicable for evaluation of ED potency of highly lipophilic metabolites of POPs. To that end, a yeast-based bio-assay protocol was used. Estrogenic / androgenic activity of some native brominated biphenyl ethers (BDEs) / chlorinated biphenyls (CBs), and their hydroxylated / methoxylated metabolites was assessed. Since data (including potency compared to reference native hormones) obtained using different protocols vary, the possibility that yeast transforms POPs into some more potent compounds was first checked; it seems that no such transformation is important from the test applicability standpoint...
May 18, 2018: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/29773553/intratumoral-androgen-levels-are-linked-to-tmprss2-erg-fusion-in-prostate-cancer
#4
Matias Knuuttila, Arfa Mehmood, Jenni Mäki-Jouppila, Henrik Ryberg, Pekka Taimen, Juha Knaapila, Otto Ettala, Peter J Bostrom, Claes Ohlsson, Mikko S Venäläinen, Asta Laiho, Laura L Elo, Petra Sipilä, Sari Makela, Matti Poutanen
Intratumoral androgen biosynthesis is one of the mechanisms involved in the progression of prostate cancer, and an important target for novel prostate cancer therapies. Using gas chromatography-tandem mass spectrometry and genome-wide RNA sequencing, we have analyzed androgen concentrations and androgen-regulated gene expression in cancerous and morphologically benign prostate tissue specimens and serum samples obtained from 48 primary prostate cancer patients. Intratumoral DHT concentrations were significantly higher in the cancerous tissues compared to benign prostate (p<0...
May 17, 2018: Endocrine-related Cancer
https://www.readbyqxmd.com/read/29771451/modulation-of-inflammatory-and-hormonal-parameters-in-response-to-testosterone-therapy-effects-on-the-ventral-prostate-of-adult-rats
#5
Leonardo O Mendes, Anthony C S Castilho, Cristiane F Pinho, Bianca F Gonçalvez, Eduardo M Razza, Luiz Gustavo A Chuffa, Janete A Anselmo-Franci, Wellerson R Scarano, Francisco E Martinez
Testosterone is often recommended in the treatment of several aging-related conditions. However, there are still questions about the consequences of this therapy in terms of hormonal and inflammatory parameters that are crucial for prostate homeostasis.Thus, we investigate if the testosterone therapy (TT) modulates the hormone receptors and inflammatory cytokines in the ventral prostate of adult rats. Wistar rats aging 150 days were divided into two experimental groups(n = 10/group): T: received subcutaneous injections of testosterone cypionate (5mg/kg body weight) diluted in corn oil every other day for 4 weeks; and C: received corn oil as vehicle...
May 17, 2018: Cell Biology International
https://www.readbyqxmd.com/read/29765299/src-kinase-dependent-rapid-non-genomic-modulation-of-hippocampal-spinogenesis-induced-by-androgen-and-estrogen
#6
Mika Soma, Jonghyuk Kim, Asami Kato, Suguru Kawato
Dendritic spine is a small membranous protrusion from a neuron's dendrite that typically receives input from an axon terminal at the synapse. Memories are stored in synapses which consist of spines and presynapses. Rapid modulations of dendritic spines induced by hippocampal sex steroids, including dihydrotestosterone (DHT), testosterone (T), and estradiol (E2), are essential for synaptic plasticity. Molecular mechanisms underlying the rapid non-genomic modulation through synaptic receptors of androgen (AR) and estrogen (ER) as well as its downstream kinase signaling, however, have not been well understood...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29743556/no-evidence-for-the-immunocompetence-handicap-hypothesis-in-male-humans
#7
Judyta Nowak, Bogusław Pawłowski, Barbara Borkowska, Daria Augustyniak, Zuzanna Drulis-Kawa
The observations that testosterone might be immunosuppressive, form the basis for the immunocompetence handicap hypothesis (ICHH). According to ICHH only high-quality individuals can maintain high levels of testosterone and afford the physiological cost of hormone-derived immunosuppression. The animal and human studies that attempted to support the ICHH by precisely defined impairment of immunity associated with high testosterone levels are inconclusive. Furthermore, human studies have used only selected immune functions and varying testosterone fractions...
May 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29740398/neurosteroids-in-adult-hippocampus-of-male-and-female-rodents-biosynthesis-and-actions-of-sex-steroids
#8
REVIEW
Yasushi Hojo, Suguru Kawato
The brain is not only the target of steroid hormones but also is able to locally synthesize steroids de novo . Evidence of the local production of steroids in the brain has been accumulating in various vertebrates, including teleost fish, amphibia, birds, rodents, non-human primates, and humans. In this review, we mainly focus on the local production of sex steroids in the hippocampal neurons of adult rodents (rats and mice), a center for learning and memory. From the data of the hippocampus of adult male rats, hippocampal principal neurons [pyramidal cells in CA1-CA3 and granule cells in dentate gyrus (DG)] have a complete system for biosynthesis of sex steroids...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29721213/anabolic-androgenic-steroids-and-carcinogenicity-focusing-on-leydig-cell-a-literature-review
#9
REVIEW
Monica Salerno, Orazio Cascio, Giuseppe Bertozzi, Francesco Sessa, Antonietta Messina, Vincenzo Monda, Luigi Cipolloni, Antonio Biondi, Aurora Daniele, Cristoforo Pomara
Anabolic androgenic steroids (AAS) are some of the most common drugs used among athletes, frequently in combination with resistance training, to improve physical performance or for aesthetic purpose. A great number of scientific reports showed the detrimental effects of anabolic androgenic steroids on different organs and tissues. In this literature review, we analyzed the AAS-mediated carcinogenicity, focusing on Leydig cell tumor. AAS-induced carcinogenicity can affect DNA transcription through two pathways...
April 10, 2018: Oncotarget
https://www.readbyqxmd.com/read/29721186/myofibroblast-androgen-receptor-expression-determines-cell-survival-in-co-cultures-of-myofibroblasts-and-prostate-cancer-cells-in-vitro
#10
Helen M Palethorpe, Damien A Leach, Eleanor F Need, Paul A Drew, Eric Smith
Fibroblasts express androgen receptor (AR) in the normal prostate and during prostate cancer development. We have reported that loss of AR expression in prostate cancer-associated fibroblasts is a poor prognostic indicator. Here we report outcomes of direct and indirect co-cultures of immortalised AR-positive (PShTert-AR) or AR-negative (PShTert) myofibroblasts with prostate cancer cells. In the initial co-cultures the AR-negative PC3 cell line was used so AR expression and signalling were restricted to the myofibroblasts...
April 10, 2018: Oncotarget
https://www.readbyqxmd.com/read/29716628/nanog-interaction-with-the-androgen-receptor-signaling-axis-induce-ovarian-cancer-stem-cell-regulation-studies-based-on-the-crispr-cas9-system
#11
Kaijian Ling, Lupin Jiang, Shi Liang, Joseph Kwong, Leiyan Yang, Yudi Li, PingYin, Qingchun Deng, Zhiqing Liang
BACKGROUND: Ovarian cancer stem cells (OCSCs) contribute to the poor prognosis of ovarian cancer. Involvement of the androgen receptor (AR) in the malignant behaviors of other tumors has been reported. However, whether AR associates with Nanog (a stem cell marker) and participates in OCSC functions remain unclear. In this study, we investigated the interaction of Nanog with AR and examined whether this interaction induced stem-like properties in ovarian cancer cells. METHODS: AR and Nanog expression in ovarian tumors was evaluated...
May 2, 2018: Journal of Ovarian Research
https://www.readbyqxmd.com/read/29699584/androgen-receptor-and-heat-shock-protein-27-co-regulate-the-malignant-potential-of-molecular-apocrine-breast-cancer
#12
Xiaozhen Liu, Changyun Feng, Junjun Liu, Lu Cao, Guomin Xiang, Fang Liu, Shuling Wang, Jiao Jiao, Yun Niu
BACKGROUND: The most striking feature of molecular apocrine breast cancer (MABC) is the expression of androgen receptor (AR). We report here the mechanism of the AR in regulating the behavior of MABC. METHODS: The MABC cell line, MDA-MB-453, and the nonMABC cell line, MCF7, were used in this study. The effect of dihydrotestosterone (DHT) and heat shock protein 27 (HSP27) on cell proliferation was quantified using the cell counter kit-8 (CCK8) and clonogenic assays in vitro and by a xenograft tumor model in vivo...
April 27, 2018: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/29688269/polycystic-ovary-syndrome-possible-involvement-of-androgen-induced-chemerin-mediated-ovarian-recruitment-of-monocytes-macrophages
#13
Patricia D A Lima, Anne-Laure Nivet, Qi Wang, Yi-An Chen, Arthur Leader, Annie Cheung, Chii-Ruey Tzeng, Benjamin K Tsang
Polycystic ovary syndrome (PCOS) is a continuum of endocrine and reproductive disorders characterized by hyperandrogenism, antral follicle growth arrest and chronic inflammation. Macrophages play key role in inflammation and the balance between M1 (inflammatory) and M2 (anti-inflammatory) macrophages determines physiological/pathological outcomes. Here, we investigated if hyperandrogenism increases ovarian chemerin altering the balance of M1 and M2 macrophages and the granulosa cell death. Ovarian chemerin was up-regulated by 5α-dihydrotestosterone (DHT) in lean and overweight rats; while increased serum chemerin levels were only evident in overweight rats, suggesting that the serum chemerin may be reflective of a systemic response and associated with obesity, whereas increased ovarian chemerin expression is a localized response independent of the metabolic status...
April 24, 2018: Biology of Reproduction
https://www.readbyqxmd.com/read/29682196/testosterone-metabolites-inhibit-proliferation-of-castration-and-therapy-resistant-prostate-cancer
#14
Felix Bremmer, Hubertus Jarry, Valerie Unterkircher, Silke Kaulfuss, Peter Burfeind, Heinz-Joachim Radzun, Philipp Ströbel, Paul Thelen
Novel treatments for castration-resistant prostate cancer (CRPC) such as abiraterone acetate (AA) or enzalutamide effectively target the androgen pathway to arrest aberrant signalling and cell proliferation. Testosterone is able to inhibit tumour cell growth in CRPC. Estrogen receptor-beta (ERβ) binds the testosterone-metabolites 3β-androstanediol and 3α-androstanediol in parallel to the canonical estradiol. In the prostate it is widely accepted that ERβ regulates estrogen signalling, mediating anti-proliferative effects...
March 30, 2018: Oncotarget
https://www.readbyqxmd.com/read/29673241/effect-of-acute-mid-intensity-treadmill-exercise-on-the-androgen-hormone-level-and-uncoupling-protein-1-expression-in-brown-fat-tissue-of-mouse
#15
Nahyun Kim, Jisu Kim, Choongsung Yoo, Kiwon Lim, Takayuki Akimoto, Jonghoon Park
PURPOSE: Brown adipose tissue (BAT) plays an important role in metabolizing different substances, including androgens. The aim of this study was to determine whether a single bout of aerobic exercise would increase the androgen hormone concentration in mouse BAT and whether its increase was associated with uncoupling protein-1 (UCP-1), protein kinase A (PKA)-related mechanism in BAT. METHODS: Twenty, 9-week-old ICR adult male micewere randomly divided into three groups: Control (n=6, CON), Exercise (n=7, EX), and Exercise + SRD5A1A2 inhibitor (n=7, EXIN)...
March 30, 2018: Journal of Exercise Nutrition & Biochemistry
https://www.readbyqxmd.com/read/29671886/serum-androgens-and-risk-of-atrial-fibrillation-in-older-men-the-cardiovascular-health-study
#16
Michael A Rosenberg, Molly M Shores, Alvin M Matsumoto, Petra Bůžková, Leslie A Lange, Richard A Kronmal, Susan R Heckbert, Kenneth J Mukamal
BACKGROUND: Decline in serum androgens is common among older men and has been associated with cardiovascular disease, although its role in risk of atrial fibrillation (AF) has not been well defined. HYPOTHESIS: Low serum androgens are associated with an increased risk of AF. METHODS: We examined the prospective associations between testosterone, its more active metabolite dihydrotestosterone (DHT), and sex-hormone binding globulin (SHBG) with risk of AF among 1019 otherwise healthy men of average age 76...
April 19, 2018: Clinical Cardiology
https://www.readbyqxmd.com/read/29666640/investigating-the-interactive-effects-of-sex-steroid-hormones-and-brain-derived-neurotrophic-factor-during-adolescence-on-hippocampal-nmda-receptor-expression
#17
Cushla R McCarthny, Xin Du, YeeWen Candace Wu, Rachel A Hill
Sex steroid hormones have neuroprotective properties which may be mediated by brain-derived neurotrophic factor (BDNF). This study sought to determine the interactive effects of preadolescent hormone manipulation and BDNF heterozygosity (+/- ) on hippocampal NMDA-R expression. Wild-type and BDNF+/- mice were gonadectomised, and females received either 17 β -estradiol or progesterone treatment, while males received either testosterone or dihydrotestosterone (DHT) treatment. Dorsal (DHP) and ventral hippocampus (VHP) were dissected, and protein expression of GluN1, GluN2A, GluN2B, and PSD-95 was assessed by Western blot analysis...
2018: International Journal of Endocrinology
https://www.readbyqxmd.com/read/29665500/aromatase-inhibition-by-letrozole-attenuates-kainic-acid-induced-seizures-but-not-neurotoxicity-in-mice
#18
Ramsha Iqbal, Gaurav K Jain, Fouzia Siraj, Divya Vohora
Evidence shows neurosteroids play a key role in regulating epileptogenesis. Neurosteroids such as testosterone modulate seizure susceptibility through its transformation to metabolites which show proconvulsant and anticonvulsant effects, respectively. Reduction of testosterone by aromatase generates proconvulsant 17-β estradiol. Alternatively, testosterone is metabolized into 5α-dihydrotestosterone (5α-DHT) by 5α-reductase, which is then reduced by 3α-hydroxysteroid oxidoreductase enzyme (3α-HSOR) to form anticonvulsant metabolite 3α-androstanediol (3α-Diol), a potent GABAA receptor modulating neurosteroid...
April 9, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29660344/hyperhomocysteinemia-and-hyperandrogenemia-share-pcsk9-ldlr-pathway-to-disrupt-lipid-homeostasis-in-pcos
#19
Kalyani Mondal, Pratip Chakraborty, S N Kabir
Women with polycystic ovary syndrome (PCOS) are at increased risk of cardiovascular diseases (CVD); however, the independent role of PCOS in the incident CVD remains unknown. There are reports that hyperhomocysteinemia (HHcy), a potential cause of CVD, is frequently associated with PCOS. The present study investigates the independent attributes of hyperandrogenemia (HA), the integral associate of PCOS, and HHcy in causing atherogenic dyslipidemia. Twenty-five-day old rats were treated with homocysteine (Hcy) at 50 mg/kg/day dose level for 12 weeks...
April 13, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29642629/17%C3%AE-hydroxysteroid-dehydrogenase-type-2-expression-is-induced-by-androgen-signaling-in-endometrial-cancer
#20
Chiaki Hashimoto, Yasuhiro Miki, Sota Tanaka, Kiyoshi Takagi, Misaki Fue, Zhulanqiqige Doe, Bin Li, Nobuo Yaegashi, Takashi Suzuki, Kiyoshi Ito
Endometrial cancer is one of the most common female pelvic cancers and has been considered an androgen-related malignancy. Several studies have demonstrated the anti-cell proliferative effect of androgen on endometrial cancer cells; however, the mechanisms of the anti-cancer effect of androgen remain largely unclear. 17β-hydroxysteroid dehydrogenase type 2 (17β-HSD2), which catalyzes the conversion of E2 to E1, is known to be upregulated by androgen treatment in breast cancer cells. In this study, we therefore focused on the role of androgen on estrogen dependence in endometrial cancer...
April 10, 2018: International Journal of Molecular Sciences
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