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Zhang X, Fang C, Lou X, Yang G, Kong C, Shi Y, Huang D. Determination of 17α-methyltestosterone in aquatic products using high-performance liquid chromatography-tandem mass spectrometry. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Chang WC, Cowan DA, Walker CJ, Wojek N, Brailsford AD. Determination of anabolic steroids in dried blood using microsampling and gas chromatography-tandem mass spectrometry: Application to a testosterone gel administration study. J Chromatogr A 2020; 1628:461445. [DOI: 10.1016/j.chroma.2020.461445] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 07/28/2020] [Accepted: 07/31/2020] [Indexed: 12/18/2022]
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Puiu AA, Radke S, Votinov M, Habel U, Herpertz-Dahlmann B, Turetsky B, Konrad K. Serum Testosterone and Cortisol Concentrations After Single-Dose Administration of 100-Mg Transdermal Testosterone in Healthy Men. Front Pharmacol 2019; 10:1397. [PMID: 31824320 PMCID: PMC6881786 DOI: 10.3389/fphar.2019.01397] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 11/01/2019] [Indexed: 01/08/2023] Open
Abstract
The growing interest in testosterone's effects on men's social behaviors, in particular aggressive, risk-taking, or status maintenance behaviors, is accompanied by a paucity of dose-dependent pharmacokinetic data. Examining the neurophysiological effects of transdermal testosterone typically includes a 4h delay before further brain-behavior measurements. Nevertheless, high heterogeneity regarding the timing of follow-up measurements and dosage remains. In a double-blind placebo-controlled design, we examined the short-term pharmacokinetic profile of 100-mg transdermal testosterone (Testotop®) to determine the optimal time for detecting testosterone-mediated effects. Across two studies, 35 healthy men received a single dose of testosterone and placebo in two separate sessions. In study one (n = 16), serum testosterone and cortisol were assessed serially every 30 min up to 2 h posttreatment. In study two (n = 19), we assessed serum testosterone and cortisol at baseline, 2 h, and 4.15 h (255 min) posttreatment. Relative to baseline and placebo, transdermal testosterone significantly increased total serum testosterone concentrations 90 min posttreatment, reaching maximum concentration between 2 h and 3 h posttreatment. Albeit elevated, serum testosterone levels gradually decreased between 2 h and 4 h following treatment. Transdermal testosterone did not suppress cortisol release. Instead, cortisol concentrations decreased according to cortisol's known circadian rhythm. Unlike previous findings showing significant testosterone concentration increases as soon as 60 min and as late as 3 h post 150-mg testosterone treatment, our 100-mg testosterone manipulation significantly increased testosterone concentrations 90 min following treatment. These pharmacokinetic data are important in facilitating the optimization of timing parameters for future testosterone challenge studies.
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Affiliation(s)
- Andrei A Puiu
- Child Neuropsychology Section, Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Faculty of Medicine, RWTH Aachen University, Aachen, Germany.,Brain-Behavior Laboratory, Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Sina Radke
- Department of Psychiatry, Psychotherapy and Psychosomatics, Faculty of Medicine, RWTH Aachen University, Aachen, Germany
| | - Mikhail Votinov
- Department of Psychiatry, Psychotherapy and Psychosomatics, Faculty of Medicine, RWTH Aachen University, Aachen, Germany.,Institute of Neuroscience and Medicine: JARA-Institute Brain Structure Function Relationship (INM 10), Research Center Jülich, Jülich, Germany
| | - Ute Habel
- Department of Psychiatry, Psychotherapy and Psychosomatics, Faculty of Medicine, RWTH Aachen University, Aachen, Germany.,Institute of Neuroscience and Medicine: JARA-Institute Brain Structure Function Relationship (INM 10), Research Center Jülich, Jülich, Germany
| | - Beate Herpertz-Dahlmann
- Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Faculty of Medicine, RWTH Aachen University, Aachen, Germany
| | - Bruce Turetsky
- Brain-Behavior Laboratory, Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, United States
| | - Kerstin Konrad
- Child Neuropsychology Section, Department of Child and Adolescent Psychiatry, Psychosomatics and Psychotherapy, Faculty of Medicine, RWTH Aachen University, Aachen, Germany.,JARA-Brain Institute II Molecular Neuroscience and Neuroimaging, Research Centre Jülich, Jülich, Germany
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Henderson A, Thoelen G, Nadler A, Barraza J, Nave G. Testing the influence of testosterone administration on men's honesty in a large laboratory experiment. Sci Rep 2018; 8:11556. [PMID: 30068962 PMCID: PMC6070559 DOI: 10.1038/s41598-018-29928-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 07/17/2018] [Indexed: 01/10/2023] Open
Abstract
The impact of testosterone on decision-making is a growing literature, with several reports of economically relevant outcomes. Similar to Wibral et al. (2012), we investigate the effects of exogenous testosterone administration on deception in a double-blind placebo controlled study. Participants (N = 242) were asked to roll a die in private and were paid according to their reported roll, which creates the opportunity to lie about the outcome to increase earnings. We find evidence for self-serving lying in both treatment and control groups and a statistically insignificant negative effect (d = −0.17, 95% CI[−0.42, 0.08]) indicating more honest behavior (i.e., lower reports) following testosterone administration. Although insignificant, the direction was the same as in the Wibral et al. study, and the meta-analytic effect of the two studies demonstrates lower reporting (i.e., more honesty) following testosterone (vs. placebo) administration, significant at the 0.05 level (d = −0.27, 95% CI[−0.49, −0.06]). We discuss how our results and methodology compare with Wibral et al. and identify potential causes for differences in findings. Finally, we consider several plausible connections between testosterone and lying that may be further investigated using alternative methodologies.
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Affiliation(s)
- Austin Henderson
- University of California San Diego, Rady School of Management, San Diego, 92093, United States
| | - Garrett Thoelen
- Claremont Graduate University, Department of Politics and Economics, Claremont, 91711, United States
| | - Amos Nadler
- Western University, Ivey Business School, London, ON, N6G 0N1, Canada
| | - Jorge Barraza
- University of Southern California, Dornsife, Los Angeles, 90089, United States
| | - Gideon Nave
- University of Pennsylvania, Wharton School of Business, Philadelphia, 19104, United States.
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Carvalho LBD, Burusco KK, Jaime C, Venâncio T, Carvalho AFSD, Murgas LDS, Pinto LDMA. Complexes between methyltestosterone and β-cyclodextrin for application in aquaculture production. Carbohydr Polym 2018; 179:386-393. [DOI: 10.1016/j.carbpol.2017.09.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 09/06/2017] [Accepted: 09/08/2017] [Indexed: 12/20/2022]
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Panagiotidis D, Clemens B, Habel U, Schneider F, Schneider I, Wagels L, Votinov M. Exogenous testosterone in a non-social provocation paradigm potentiates anger but not behavioral aggression. Eur Neuropsychopharmacol 2017; 27:1172-1184. [PMID: 28939164 DOI: 10.1016/j.euroneuro.2017.07.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 06/16/2017] [Accepted: 07/18/2017] [Indexed: 10/18/2022]
Abstract
Animal studies suggest a causal link between testosterone and aggression. However, in human research the exact role of this hormone is still unclear, having been linked to dominance and approach behavior rather than to aggression per se. In a social context, the induction of aggression might be confounded with dominance or status changes, which potentially influence the association between aggression and testosterone. The objective of the current study was to investigate the influence of testosterone on non-social aggression in a double-blind, placebo-controlled experiment including 90 healthy male participants. To this end, we developed an innovative paradigm in which participants were provoked by a malfunctioning joystick restraining them from a promised reward. As measures for aggression throughout the task the joystick amplitude was recorded and anger was assessed via emotional self-ratings. Participants reacted to the provocation with a significant shift to more negative emotions and increased implicit aggressive behavior, reflected in the force exerted to pull the joystick following provocation. Importantly, the study demonstrated first evidence for a modulating influence of testosterone on non-social aggression in males: Self-rated anger was significantly elevated in the testosterone group compared to the placebo group as a function of provocation. Testosterone administration did not significantly influence the implicit aggressive response. These findings demonstrate a potentiating effect of testosterone on provocation-related anger in a non-social context. Furthermore, the results highlight the importance of disentangling different components of aggression and characterizing different influencing factors when inferring on hormonal effects.
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Affiliation(s)
- Despina Panagiotidis
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, Uniklinik RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany.
| | - Benjamin Clemens
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, Uniklinik RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Ute Habel
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, Uniklinik RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany; JARA-Institute Brain Structure-Function Relationship, Research Center Jülich and RWTH Aachen University, 52074 Aachen, Germany
| | - Frank Schneider
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, Uniklinik RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany; JARA-Institute Brain Structure-Function Relationship, Research Center Jülich and RWTH Aachen University, 52074 Aachen, Germany
| | - Isabella Schneider
- Department of General Psychiatry, Center of Psychosocial Medicine, University of Heidelberg, Germany
| | - Lisa Wagels
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, Uniklinik RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany
| | - Mikhail Votinov
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical Faculty, Uniklinik RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany; Institute of Neuroscience and Medicine 10, Research Center Jülich, Jülich, Germany
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Cueva C, Roberts RE, Spencer T, Rani N, Tempest M, Tobler PN, Herbert J, Rustichini A. Cortisol and testosterone increase financial risk taking and may destabilize markets. Sci Rep 2015; 5:11206. [PMID: 26135946 PMCID: PMC4489095 DOI: 10.1038/srep11206] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 04/10/2015] [Indexed: 11/14/2022] Open
Abstract
It is widely known that financial markets can become dangerously unstable, yet it is unclear why. Recent research has highlighted the possibility that endogenous hormones, in particular testosterone and cortisol, may critically influence traders’ financial decision making. Here we show that cortisol, a hormone that modulates the response to physical or psychological stress, predicts instability in financial markets. Specifically, we recorded salivary levels of cortisol and testosterone in people participating in an experimental asset market (N = 142) and found that individual and aggregate levels of endogenous cortisol predict subsequent risk-taking and price instability. We then administered either cortisol (single oral dose of 100 mg hydrocortisone, N = 34) or testosterone (three doses of 10 g transdermal 1% testosterone gel over 48 hours, N = 41) to young males before they played an asset trading game. We found that both cortisol and testosterone shifted investment towards riskier assets. Cortisol appears to affect risk preferences directly, whereas testosterone operates by inducing increased optimism about future price changes. Our results suggest that changes in both cortisol and testosterone could play a destabilizing role in financial markets through increased risk taking behaviour, acting via different behavioural pathways.
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Affiliation(s)
- Carlos Cueva
- Departamento de Fundamentos del Análisis Económico, Universidad de Alicante, Spain
| | - R Edward Roberts
- Division of Brain Sciences, Department of Medicine, Imperial College London, UK
| | - Tom Spencer
- 1] Department of Psychiatry, University of Cambridge, UK [2] Cambridgeshire and Peterborough NHS Foundation Trust, Elizabeth House, Fulbourn Hospital, Cambridge, UK
| | - Nisha Rani
- Cambridgeshire and Peterborough NHS Foundation Trust, Elizabeth House, Fulbourn Hospital, Cambridge, UK
| | | | - Philippe N Tobler
- Laboratory for Social and Neural Systems Research, Department of Economics, University of Zurich, Switzerland
| | - Joe Herbert
- John van Geest Centre for Brain Repair, Department of Clinical Neurosciences, University of Cambridge, UK
| | - Aldo Rustichini
- 1] Department of Economics, University of Minnesota, USA [2] Department of Physiology, Development and Neuroscience, University of Cambridge, UK
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Vatti SK, Madanieh R, Madanieh A, Kosmas CE, Vittorio TJ. Cardiovascular Benefits of Testosterone Replacement Therapy in the Andropausal Male. Health (London) 2015. [DOI: 10.4236/health.2015.79135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Intarakumhaeng R, Li SK. Effects of solvent on percutaneous absorption of nonvolatile lipophilic solute. Int J Pharm 2014; 476:266-76. [PMID: 25261711 DOI: 10.1016/j.ijpharm.2014.09.034] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 09/14/2014] [Accepted: 09/23/2014] [Indexed: 11/21/2022]
Abstract
Understanding the effects of solvents upon percutaneous absorption can improve drug delivery across skin and allow better risk assessment of toxic compound exposure. The objective of the present study was to examine the effects of solvents upon the deposition of a moderately lipophilic solute at a low dose in the stratum corneum (SC) that could influence skin absorption of the solute after topical application. Skin permeation experiments were performed using Franz diffusion cells and human epidermal membrane (HEM). Radiolabeled corticosterone ((3)H-CS) was the model permeant. The solvents used had different evaporation and skin penetration properties that were expected to impact skin deposition of CS and its absorption across skin. The results show no correlation between the rate of absorption of the permeant and the rate of solvent evaporation/penetration with ethanol, hexane, isopropanol, and butanol as the solvent; all of these solvents have fast evaporation rates (complete evaporation in <30 min after application). This suggests no differences in solvent-induced deposition of CS in the SC for the fast-evaporating solvents. The results of these fast-evaporating solvents were different from those of water, propylene glycol, and polyethylene glycol 400, that a relationship between permeant absorption and the rate of solvent evaporation was observed.
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Eisenegger C, von Eckardstein A, Fehr E, von Eckardstein S. Pharmacokinetics of testosterone and estradiol gel preparations in healthy young men. Psychoneuroendocrinology 2013; 38:171-8. [PMID: 22721608 DOI: 10.1016/j.psyneuen.2012.05.018] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2012] [Revised: 05/25/2012] [Accepted: 05/25/2012] [Indexed: 11/23/2022]
Abstract
The paucity of pharmacokinetic data on testosterone gel formulations and absence of such data on estradiol administration in healthy young men constitutes a fundamental gap of knowledge in behavioral endocrinological research. We addressed this issue in a double-blind and placebo controlled study in which we applied a topical gel containing either 150mg of testosterone (N=10), 2mg of estradiol (N=8) or a respective placebo (N=10) to 28 healthy young men. We then assessed serum concentrations of estradiol and testosterone in one hour intervals up to seven hours after drug application, measured LH, SHBG and cortisol levels once at baseline and three, four as well as six hours after gel administration. Treatment with testosterone gel resulted in maximum total serum testosterone concentration three hours after administration and did not suppress LH, cortisol and SHBG levels at any time point. Administration of estradiol gel led to maximum estradiol serum concentration two hours after administration. There was no suppression of cortisol, SHBG and absolute LH levels. We report here, for the first time, pharmacokinetic data on both high dose testosterone and estradiol gel application in healthy young males. The proposed model will assist in the design of future studies that seek to establish causality between testosterone and estradiol gel administration and behavioral as well as neurophysiological effects.
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Abstract
Lying is a pervasive phenomenon with important social and economic implications. However, despite substantial interest in the prevalence and determinants of lying, little is known about its biological foundations. Here we study a potential hormonal influence, focusing on the steroid hormone testosterone, which has been shown to play an important role in social behavior. In a double-blind placebo-controlled study, 91 healthy men (24.32±2.73 years) received a transdermal administration of 50 mg of testosterone (n = 46) or a placebo (n = 45). Subsequently, subjects participated in a simple task, in which their payoff depended on the self-reported outcome of a die-roll. Subjects could increase their payoff by lying without fear of being caught. Our results show that testosterone administration substantially decreases lying in men. Self-serving lying occurred in both groups, however, reported payoffs were significantly lower in the testosterone group (p<0.01). Our results contribute to the recent debate on the effect of testosterone on prosocial behavior and its underlying channels.
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Affiliation(s)
- Matthias Wibral
- Department of Economics, University of Bonn, Bonn, Germany
- Center for Economics and Neuroscience, University of Bonn, Bonn, Germany
| | - Thomas Dohmen
- Research Center for Education and the Labor Market, Maastricht University, Maastricht, The Netherlands
| | | | - Bernd Weber
- Center for Economics and Neuroscience, University of Bonn, Bonn, Germany
- Department of Epileptology & Department of NeuroCognition, Life&Brain Center, University of Bonn, Bonn, Germany
| | - Armin Falk
- Department of Economics, University of Bonn, Bonn, Germany
- Center for Economics and Neuroscience, University of Bonn, Bonn, Germany
- * E-mail:
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Affiliation(s)
- Ritu Malik
- Pharmaceutics Division, CSIR-Central
Drug Research Institute, Lucknow, 226001, India
| | - K. S. Venkatesh
- ACES and Department of Electrical
Engineering, Indian Institute of Technology, Kanpur, 208016, India
| | - Anil Kumar Dwivedi
- Pharmaceutics Division, CSIR-Central
Drug Research Institute, Lucknow, 226001, India
| | - Amit Misra
- Pharmaceutics Division, CSIR-Central
Drug Research Institute, Lucknow, 226001, India
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Di Luigi L, Sgrò P, Aversa A, Migliaccio S, Bianchini S, Botrè F, Romanelli F, Lenzi A. Concerns about serum androgens monitoring during testosterone replacement treatments in hypogonadal male athletes: a pilot study. J Sex Med 2012; 9:873-86. [PMID: 22321254 DOI: 10.1111/j.1743-6109.2011.02600.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
INTRODUCTION A well-tailored testosterone replacement treatment (TRT) in male hypogonadal athletes plays a pivotal role to restore physiological performances, to reduce health risks, and to guarantee the ethic of competition. Few studies evaluated individual androgens profiles during TRT in trained individuals. AIM The aim of this article was to verify the efficacy in restoring eugonadal serum and urinary androgens profiles after testosterone enanthate (TE) and gel (TG) administration. METHODS Ten male Caucasian-trained volunteers affected by severe hypotestosteronemia (<8 nmol/L) were included. Serum androgens and urinary testosterone metabolites were evaluated, in the same subjects, before and weekly for 5 weeks after both a single intramuscular TE injection (250 mg) and during a daily administration of TG (50 mg/die of testosterone), respectively. MAIN OUTCOME MEASURES The main outcome measures of this article were serum total testosterone (TT), dihydrotestosterone (DHT), calculated free and bioavailable testosterone (cFT, cBioT), 17-β-estradiol, and urinary glucuronide testosterone metabolites. RESULTS Supraphysiological TT concentrations were observed in 50% of our volunteers until 7 days after TE and in the 4% of total samples after TG. Serum DHT was high both after TE (all volunteers on day 7 and 50% on day 14) and during TG (32% of total samples). A relatively low number of samples showed normal cFT and cBioT both after TE and TG (20-44%, respectively). Urinary metabolites were related to the type of treatment and to serum androgens profile and resulted in the normal ranges from 15% to 60% of total samples. CONCLUSION Besides well-known variations of mean serum TT, we showed a high percentage of serum and urinary samples with abnormal androgens, being TG safer than TE. We conclude that monitoring TRT with TT only may be inaccurate because of abnormal fluctuations of other circulating androgens. Further studies to identify the appropriate markers of eugonadism during TRT are highly warranted both in athletes and in non-athletes.
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Affiliation(s)
- Luigi Di Luigi
- Unit of Endocrinology, Department of Health Sciences, University of Rome Foro Italico, Rome, Italy.
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Popken G. Testosteronsubstitution. Urologe A 2010; 49:37-42. [DOI: 10.1007/s00120-009-2196-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Cavender RK, Fairall M. Subcutaneous Testosterone Pellet Implant (Testopel®) Therapy for Men with Testosterone Deficiency Syndrome: A Single‐Site Retrospective Safety Analysis. J Sex Med 2009; 6:3177-92. [DOI: 10.1111/j.1743-6109.2009.01513.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ibrahim SA, Li SK. Effects of solvent deposited enhancers on transdermal permeation and their relationship with Emax. J Control Release 2009; 136:117-24. [PMID: 19331847 DOI: 10.1016/j.jconrel.2009.01.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2009] [Accepted: 01/31/2009] [Indexed: 10/21/2022]
Abstract
Many topical pharmaceuticals such as aerosols, topical sprays, and hydro-alcoholic and polymer based gels contain chemical enhancers. The objectives of the present study were to (a) determine the enhancement effects induced by enhancers deposited from a volatile solvent on human epidermal membrane (HEM) upon transdermal permeation enhancement, (b) compare these enhancement factors with Emax, and (c) examine the relationship between enhancer-induced permeation enhancement and stratum corneum equilibrium uptake enhancement. In this study, HEM was treated with enhancer/ethanol (enhancer dissolved in ethanol). After the evaporation of ethanol, passive transport experiments were conducted using corticosterone (CS) as the model permeant. The uptake of another model corticosteroid, estradiol (E2beta), into the intercellular lipid domain of stratum corneum after enhancer/ethanol treatment was also determined. The results show a correlation between Emax and the enhancement effect of most enhancers when the enhancers were deposited on the skin using the volatile solvent ethanol. The data suggest that the CS transport rate limiting domain was likely the same as the intercellular lipid domain probed by E2beta uptake. The correlation between steady-state permeation enhancement and uptake enhancement into the intercellular lipid domain suggests that the permeation enhancement mechanism is primarily due to enhancement of permeant partitioning into the transport rate limiting domain.
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Affiliation(s)
- Sarah A Ibrahim
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Cincinnati, Cincinnati, OH 45267, USA
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Paasch U, Glander HJ, Stolzenburg JU. Andrologische Testosteronersatztherapie. Urologe A 2009; 48:79-86; quiz 87. [DOI: 10.1007/s00120-008-1911-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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