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Testosterone and implant

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https://www.readbyqxmd.com/read/28739284/-%C3%A2-%C3%A2-%C3%A2-role-of-5%C3%AE-dihydrotestosterone-in-testicular-development-of-gilthead-seabream-following-finasteride-administration
#1
M García-García, M Sánchez-Hernández, M P García-Hernández, A García-Ayala, E Chaves-Pozo
In teleosts, spermatogenesis is regulated by pituitary gonadotropins and sex steroids. 5α-dihydrotestosterone (DHT), derived from testosterone (T) through the action of 5α-reductase, has recently been suggested to play a physiologically important role in some fish species. In this study, gilthead seabream, Sparus aurata L., males received an implant of 1μgT/g body mass (bm) or vehicle alone and, 7days later, 1mg finasteride (FIN, an inhibitor of 5α-reductase)/kg bm or vehicle. Serum levels of T, 11-ketotestosterone (11KT), DHT and 17β-estradiol (E2), and the mRNA levels of the main enzymes involved in their synthesis, were analysed...
July 21, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28730707/establishment-and-characterization-of-a-novel-murine-model-of-pancreatic-cancer-cachexia
#2
Katherine A Michaelis, Xinxia Zhu, Kevin G Burfeind, Stephanie M Krasnow, Peter R Levasseur, Terry K Morgan, Daniel L Marks
BACKGROUND: Cachexia is a complex metabolic and behavioural syndrome lacking effective therapies. Pancreatic ductal adenocarcinoma (PDAC) is one of the most important conditions associated with cachexia, with >80% of PDAC patients suffering from the condition. To establish the cardinal features of a murine model of PDAC-associated cachexia, we characterized the effects of implanting a pancreatic tumour cell line from a syngeneic C57BL/6 KRAS(G12D) P53(R172H) Pdx-Cre(+/+) (KPC) mouse...
July 20, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28721614/low-doses-of-chlorpyrifos-interfere-with-spermatogenesis-of-rats-through-reduction-of-sex-hormones
#3
Dinithi Champika Peiris, Thamali Dhanushka
Use of pesticides results in indirect effects on human health. We aimed to evaluate implications of toxicological effects of subchronic chlorpyrifos exposure on reproductive function in male rats. A total of 48 adult Wistar male rats were separated into four groups (n = 12). Animals were gavaged with 2.5 mg/kg (T1), 5 mg/kg (T2), or 10 mg/kg (T3) body weight of chlorpyrifos (CPF) or distilled water (control) daily for 30 days. Organ weights, epididymal sperm parameters, DNA integrity, sex hormonal (FHS and LH) levels, and alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma-glutamyl transferase (GGT), and creatinine concentrations were determined on day 31...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28673432/pharmacokinetics-clinical-efficacy-safety-profile-and-patient-reported-outcomes-in-patients-receiving-subcutaneous-testosterone-pellets-900-mg-for-treatment-of-symptoms-associated-with-androgen-deficiency
#4
Chris G McMahon, Neil Shusterman, Brian Cohen
BACKGROUND: Implantation of testosterone doses of at least 150 to 450 mg (ie, two to six pellets) is common clinical practice despite a lack of prospective data. AIM: To evaluate pharmacokinetics, clinical efficacy, safety, and patient-reported outcomes in men with androgen deficiency who received implantation of testosterone pellets (900 mg) in an open-label study. METHODS: Men with androgen deficiency (serum testosterone < 300 ng/dL [10...
July 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28659174/crispr-cas9-targeting-of-gprc6a-suppresses-prostate-cancer-tumorigenesis-in-a-human-xenograft-model
#5
Ruisong Ye, Min Pi, John V Cox, Satoru K Nishimoto, L Darryl Quarles
BACKGROUND: GPRC6A is implicated in the pathogenesis of prostate cancer, but its role remains uncertain because of a purported tolerant gene variant created by substitution of a K..Y polymorphism in the 3rd intracellular loop (IL) that evolved in the majority of humans and replaces the ancestral RKLP present in 40% of humans of African descent and all other species. METHODS: We determined whether the K..Y polymorphism is present in human-derived prostate cancer cell lines by sequencing the region of the 3rd IL and assessed the cellular localization of a "humanized" mouse GPRC6A containing the K...
June 28, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28655647/evaluation-of-the-effects-of-%C3%AE-cypermethrin-on-fetal-rat-testicular-steroidogenesis
#6
Anne-Marie Saillenfait, Jean-Philippe Sabaté, Flavien Denis, Guillaume Antoine, Alain Robert, Alain-Claude Roudot, Dieynaba Ndiaye, Ethel Eljarrat
Pregnant Sprague-Dawley rats were administered the insecticide α-cypermethrin at doses of 0.1, 1, 5, or 10mg/kg/day, or di-isobutyl phthalate (DIBP) at 250mg/kg/day, by gavage, from gestation day (GD) 13 to 19. Testicular testosterone production and the expression of several key genes related to cholesterol and androgen synthesis and transport were assessed in GD 19 male fetuses. Dams treated with 10mg/kg/day of α-cypermethrin showed clinical signs of neurotoxicity and reduced body weight gain. α-Cypermethrin had no significant effect on post-implantation loss, fetal weight, incidence of male fetuses per litter, or anogenital distance of the male fetuses...
June 24, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28646317/di-n-butyl-phthalate-prompts-interruption-of-spermatogenesis-steroidogenesis-and-fertility-associated-with-increased-testicular-oxidative-stress-in-adult-male-rats
#7
Giribabu Nelli, Sreenivasula Reddy Pamanji
Di-n-butyl phthalate (DBP) is extensively used as plasticizer, and it was ubiquitary released into the environment. The present study was aimed to investigate the effect of DBP on reproductive competence in adult male rats. Adult male rats were received corn oil or DBP injection intraperitoneally (ip) at 100 and 500 mg/kg body weight on 90, 97, 104, and 111 days. Following completion of the experimental period, adult male rats were cohabitated with untreated proestrus female rats for determination of fertilization capacity...
June 24, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28637857/acute-peaks-of-testosterone-suppress-paternal-care-evidence-from-individual-hormonal-reaction-norms
#8
Wolfgang Goymann, Pamela Flores Dávila
A long-standing tenet of evolutionary endocrinology states that testosterone mediates the life-history trade-off between mating and paternal care. However, the support for a role of testosterone in suppressing paternal care is mixed: implantation studies in birds suggest that high-level testosterone implants suppress paternal care, but circulating levels of testosterone and paternal care are typically not correlated. Because any trade-off in real life must be realized with hormone levels that are within an individual's reaction norm, it is crucial to show that natural changes in the hormone can modulate behaviour...
June 28, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28617068/nuclear-factor-%C3%AE%C2%BAb-expression-in-the-endometrium-of-normal-and-overweight-women-with-polycystic-ovary-syndrome
#9
Onder Koc, Safak Ozdemirici, Mustafa Acet, Ummugulsum Soyturk, Suleyman Aydin
The aim of this study was to investigate whether the expression levels of endometrial NFκB p65 differ between normal weight and overweight PCOS women and to compare them with BMI-matched control subjects without PCOS. The study group comprised 20 normal weight (BMI: 18.5-24.9 kg/m(2)) and 15 overweight PCOS women (BMI: 25-29.9 kg/m(2)) with infertility. Healthy fertile women without PCOS were recruited as the control group. The patients in the normal weight PCOS group and control group were age and BMI-matched...
June 15, 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28588651/testosterone-suppression-with-a-unique-form-of-leuprorelin-acetate-as-a-solid-biodegradable-implant-in-patients-with-advanced-prostate-cancer-results-from-four-trials-and-comparison-with-the-traditional-leuprorelin-acetate-microspheres-formulation
#10
Mladen Solarić, Anders Bjartell, Ursula Thyroff-Friesinger, Davide Meani
BACKGROUND: There are two slow-release ready-to-use forms of leuprorelin acetate (1-month and 3-month) that are available as solid, biodegradable implants for the treatment of advanced, hormone-sensitive prostate cancer. These implants have been shown to be as effective as traditional leuprorelin acetate microspheres for achieving successful testosterone suppression (⩽0.5 ng/ml) and lowering prostate-specific antigen (PSA) levels. Here we further evaluate testosterone suppression levels from four clinical trials evaluating the 3-month leuprorelin implant, including analysis below the European Association of Urology (EAU) castration level (<0...
December 2017: Therapeutic Advances in Urology
https://www.readbyqxmd.com/read/28562099/the-effectiveness-of-transdermal-testosterone-gel-1-androgel-for-poor-responders-undergoing-in-vitro-fertilization
#11
Hang Thi Doan, Lam Hoang Quan, Tung Thanh Nguyen
The study was conducted on 110 poor responders undergoing in vitro fertilization (IVF) from October 2015 to July 2016 at the IVF Center of Millitary Medical University, Vietnam. Its aim is to investigate the effectiveness of transdermal androgel before using controlled ovarian stimulation on patients undergoing IVF. A prospective, descriptive study was conducted to compare between the group of patients who used testosterone gel and the group of those who did not in terms of the following indicators: the number of oocytes retrieved, MII oocytes, fertilization rate, number of embryos, pregnancy rate, and embryo implantation rate...
May 31, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28469921/gonadotrophin-abnormalities-in-an-infant-with-lowe-syndrome
#12
Bronwen E Warner, Carol D Inward, Christine P Burren
SUMMARY: This case, presenting with bilateral impalpable testes, illustrates the relevance of a broad differential disorders of sex development case management. It provides new insights on hypothalamic-pituitary-gonadal (HPG) axis and testicular function abnormalities in the multisystem disorder of Lowe syndrome. Lowe syndrome, also known as oculocerebrorenal syndrome, is a rare disorder characterised by eye abnormalities, central nervous system involvement and proximal renal tubular acidosis...
2017: Endocrinology, Diabetes & Metabolism Case Reports
https://www.readbyqxmd.com/read/28455947/extended-day-length-in-late-winter-early-spring-with-a-return-to-natural-day-length-of-shorter-duration-increased-plasma-testosterone-and-sexual-performance-in-rams-with-or-without-melatonin-implants
#13
J A Abecia, P Chemineau, M Keller, J A Delgadillo
Sixteen rams were used to quantify the effects of long days, imposed during late winter/early spring, with or without exogenous melatonin, on plasma testosterone concentrations and ram serving capacity. Rams were assigned to two groups: photoperiod-treated rams (Artificial Photoperiod, AP; n = 8), exposed to 2 months of long days (16 hr of light/day) between 22 December and 22 February, and control rams (Natural Photoperiod, NP; n = 8). At the end of the long-day period, AP rams were returned to the natural photoperiod, and each ram in the two groups either did (+M) or did not (-M) receive three subcutaneous melatonin implants...
April 29, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28399644/effects-of-gonadectomy-and-testosterone-treatment-on-aquaporin-expression-in-the-kidney-of-normotensive-and-hypertensive-rats
#14
Su Yi Loh, Nelli Giribabu, Naguib Salleh
We tested the hypothesis that testosterone-induced increase in blood pressure was due to changes in aquaporin (AQP) expression in kidneys. In this study, expression level of kidney AQPs was investigated under testosterone influence. Adult normotensive Wistar Kyoto (WKY) and hypertensive SHR male and female rats underwent gonadectomy. For female rats, testosterone was given for six weeks duration, two weeks following ovariectomy via subcutaneous silastic implant. Mean arterial pressure (MAP) was measured in all the rats after eight weeks via carotid artery cannulation and the rats were then sacrificed and kidneys were harvested for analyses of AQP-1, 2, 3, 4, 6, and 7 mRNA and protein expressions by quantitative real-time PCR and Western blotting, respectively...
January 1, 2017: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28388831/estrogen-signaling-is-necessary-for-exercise-mediated-enhancement-of-motoneuron-participation-in-axon-regeneration-after-peripheral-nerve-injury-in-mice
#15
Melina C Acosta, Patricia A Copley, Jamie R Harrell, Jennifer C Wilhelm
Thousands of people each year suffer from peripheral nerve injury. Treatment options are limited, and recovery is often incomplete. Treadmill exercise can enhance nerve regeneration; however, this appears to occur in a sex-dependent manner. Females respond best to short duration, high speed interval training; whereas, males respond best to slower, continuous training. Previous studies have shown a role for testosterone in this process, but the role of estrogen is unknown. To evaluate the role of estrogen signaling in treadmill exercise, we blocked estrogen receptor (ER) signaling during treadmill exercise in males and female wild type mice...
April 7, 2017: Developmental Neurobiology
https://www.readbyqxmd.com/read/28324090/association-between-direct-to-consumer-advertising-and-testosterone-testing-and-initiation-in-the-united-states-2009-2013
#16
J Bradley Layton, Yoonsang Kim, G Caleb Alexander, Sherry L Emery
Importance: Testosterone initiation increased substantially in the United States from 2000 to 2013, especially among men without clear indications. Direct-to-consumer advertising (DTCA) also increased during this time. Objective: To investigate associations between televised DTCA and testosterone testing and initiation in the United States. Design, Setting, and Population: Ecologic study conducted in designated market areas (DMAs) in the United States...
March 21, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28314822/topography-and-lateralized-effect-of-acute-aromatase-inhibition-on-auditory-processing-in-a-seasonal-songbird
#17
Geert De Groof, Jacques Balthazart, Charlotte A Cornil, Annemie Van der Linden
It is increasingly recognized that brain-derived estrogens (neuroestrogens) can regulate brain physiology and behavior much faster than what was previously known from the transcriptional action of estrogens on nuclear receptors. One of the best examples of such neuromodulation by neuroestrogens concerns the acute regulation of sensory coding by the auditory cortex as demonstrated by electrophysiological studies of selected neurons in zebra finches. Yet, the spatial extent of such modulation by neuroestrogens is not known...
April 19, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28237812/physiological-and-behavioral-effects-of-exogenous-corticosterone-in-a-free-ranging-ectotherm
#18
Natalie M Claunch, Julius A Frazier, Camilo Escallón, Ben J Vernasco, Ignacio T Moore, Emily N Taylor
In the face of global change, free-ranging organisms are expected to experience more unpredictable stressors. An understanding of how organisms with different life history strategies will respond to such changes is an integral part of biodiversity conservation. Corticosterone (CORT) levels are often used as metrics to assess the population health of wild vertebrates, despite the fact that the stress response and its effects on organismal function are highly variable. Our understanding of the stress response is primarily derived from studies on endotherms, leading to some contention on the effects of chronic stress across and within taxa...
February 22, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28195993/subcutaneous-testosterone-letrozole-therapy-before-and-concurrent-with-neoadjuvant-breast-chemotherapy-clinical-response-and-therapeutic-implications
#19
Rebecca L Glaser, Anne E York, Constantine Dimitrakakis
OBJECTIVE: Hormone receptor-positive breast cancers respond favorably to subcutaneous testosterone combined with an aromatase inhibitor. However, the effect of testosterone combined with an aromatase inhibitor on tumor response to chemotherapy was unknown. This study investigated the effect of testosterone-letrozole implants on breast cancer tumor response before and during neoadjuvant chemotherapy. METHODS: A 51-year-old woman on testosterone replacement therapy was diagnosed with hormone receptor-positive invasive breast cancer...
February 13, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/28160669/effect-of-sex-hormone-levels-sex-body-mass-index-and-other-host-factors-on-human-craniofacial-bone-regeneration-with-bioactive-tricalcium-phosphate-grafts
#20
Christine Knabe, Aynur Mele, Peter Herbert Kann, Barbara Peleska, Doaa Adel-Khattab, Harald Renz, Alexander Reuss, Marc Bohner, Michael Stiller
Little is known regarding the associations between sex-hormone levels, sex, body mass index (BMI), age, other host factors and biomaterial stimulated bone regeneration in the human craniofacial skeleton. The aim of this study was to elucidate the associations between these factors and bone formation after sinus floor augmentation procedures (SFA) utilizing a bioactive tricalcium phosphate (TCP) bone grafting material. We conducted a prospective study in a human population in which 60 male and 60 female participants underwent SFA and dental implant placement using a staged approach...
January 28, 2017: Biomaterials
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