5-alpha reductase

5 - α 还原酶
  • 文章类型: Journal Article
    脱发(AGA)是最常见的毛发疾病,影响了大约50%的男性和女性。一种含有两种专利配方(Redensyl和SepicontrolA5)的外用乳液,已被引入作为AGA标准疗法的替代方法。44例AGA患者被随机分配使用活性洗剂或赋形剂,每天两次,共24周。在第0、12和24周通过临床检查对受试者进行评估,摄影文档,生活质量评估(DLQI),和毛色图(生长期与睡眠原之比)。41名患者,18男23女,完成研究。在接受积极治疗的患者中(n=26),7.7%有很大改善,73.1%有中度改善,19.2%保持稳定。中位自我评估得分从基线时的4分增加到24周时的6分(P<.001),而DLQI分别从4提高到3(P<.001)。在第0周、第12周和第24周,中位生长期与静止期比值分别从2.25增加到4.00,再增加到6.02。未报告显著不良事件。这种新的局部活性混合物是有效的治疗AGA,患者满意度高,提高生活质量,和出色的安全性。因此,它可能是AGA的一种有用的替代治疗方法。
    Αndrogenetic alopecia (AGA) is the most common hair disorder, affecting approximately 50% of men and women. A topical lotion that contains two patented formulas (Redensyl and Sepicontrol A5), has been introduced as an alternative approach to standard therapies for AGA. Forty-four patients with AGA were randomized either to apply the active lotion or the vehicle, twice daily for 24 weeks. Subjects were evaluated at 0, 12, and 24 weeks by clinical examination, photographic documentation, quality of life evaluation (DLQI), and trichogram (anagen-to-telogen ratio). Forty-one patients, 18 males and 23 females, completed the study. Among patients receiving active treatment (n = 26), 7.7% had great improvement, 73.1% had moderate improvement, and 19.2% remained stable. The median self-assessment score increased from 4 at baseline to 6 at 24 weeks (P < .001), while the DLQI improved from 4 to 3, respectively (P < .001). The median anagen-to-telogen ratio increased from 2.25 to 4.00 to 6.02 at weeks 0, 12, and 24, respectively. No significant adverse events were reported. This new topical active blend is effective in the treatment of AGA, with high degree of patients\' satisfaction, improvement of quality of life, and an excellent safety profile. Thus, it may represent a useful alternative therapeutic approach for AGA.
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  • 文章类型: Journal Article
    背景:性类固醇在前列腺组织生长中的具体参与尚不清楚。血浆和良性中央前列腺新鲜手术样品中的性类固醇浓度与前列腺体积相关。
    方法:2014年9月至2017年1月进行单中心前瞻性研究。年龄,肥胖参数,收集血清和前列腺内的性类固醇浓度,符合最新的内分泌学会指南和GC/MS评估的类固醇。根据年龄和体重指数(BMI)调整统计计算。
    结果:32名患者,正常和高容量前列腺组平分,包括在分析中。高容量前列腺患者年龄较大,体重较重,BMI较高。经年龄和BMI调整后的比较显示,高容量前列腺中DHT浓度较高。正常和高容量前列腺组织都以类似的方式浓缩性类固醇。组织内酶活性替代标记物比率的比较突出了相似的TT/E1和TT/E2比率,在高容量前列腺中,较高的DHT/E1比率和较低的DHT/PSA比率。
    结论:STERPROSER试验提供了大量前列腺中DHT浓度较高的证据,这可能反映了较高的5-α还原酶表达或较低的下游代谢酶的表达,例如3a-氢化类固醇脱氢酶。
    BACKGROUND: The specific involvement of the sex steroids in the growth of the prostatic tissue remains unclear. Sex steroid concentrations in plasma and in fresh surgical samples of benign central prostate were correlated to prostate volume.
    METHODS: Monocentric prospective study performed between September 2014 and January 2017. Age, obesity parameters, and both serum and intraprostatic concentrations of sex steroids were collected complying with the latest Endocrine Society guidelines and the steroids assessed by GC/MS. Statistical calculations were adjusted for age and body mass index (BMI).
    RESULTS: Thirty-two patients, equally divided between normal- and high-volume prostate groups, were included in the analysis. High-volume prostate patients were older, heavier and had higher BMI. Comparison adjusted for age and BMI showed higher DHT concentrations in high-volume prostate. Both normal- and high-volume prostate tissues concentrate sex steroids in a similar way. Comparison of enzymatic activity surrogate marker ratios within tissue highlighted similar TT/E1 and TT/E2 ratios, and higher DHT/E1 ratio and lower DHT/PSA ratio in the high-volume prostates.
    CONCLUSIONS: STERPROSER trial provides evidence for higher DHT concentration in highvolume prostates, that could reflect either higher 5-alpha reductase expression or lower expression of downstream metabolizing enzymes such as 3a-hydoxysteroid dehydrogenase.
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  • 文章类型: Journal Article
    We investigate the impact of dutasteride on prostate specific antigen (PSA) and prostate volume in men receiving testosterone (T) therapy. Twenty-three men on stable dose T therapy were randomised to receive either dutasteride or placebo for 12 months. Serum levels of PSA, T and dihydrotestosterone (DHT) and responses to the International Index of Erectile Function (IIEF) and Male Sexual Health Questionnaire (MSHQ) questionnaires were determined at baseline and at 3, 6, 9 and 12 months. Prostate volume (PV) was measured using transrectal ultrasound (TRUS) at baseline and again after 12 months. A total of 22 men (mean age 57.3) completed the study, with 11 men receiving placebo and 11 receiving dutasteride. Men receiving dutasteride had a significant decrease in PSA (-0.46 ± 0.81 ng ml(-1) ; P = 0.04) and in PV (-6.65 ± 11.0%; P = 0.03) from baseline over 12 months. DHT decreased significantly for men on dutasteride compared with men receiving placebo (P = 0.02). When compared with men who received placebo, men who received dutasteride demonstrated nonsignificant trends towards decreased PSA (-0.46 versus 0.21 ng ml(-1) ; P = 0.11), PV (-6.65% versus 3.4%; P = 0.08) and MSHQ scores (-10.2 versus 5.6; P = 0.06). Dutasteride reduces PSA and PV for men on T therapy, but perhaps less so than in men without T therapy.
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  • 文章类型: Clinical Trial, Phase III
    BACKGROUND: Dihydrotestosterone is the main androgen causative of androgenetic alopecia, a psychologically and physically harmful condition warranting medical treatment.
    OBJECTIVE: We sought to compare the efficacy and safety of dutasteride (type 1 and 2 5-alpha reductase inhibitor) with finasteride (type 2 5-alpha reductase inhibitor) and placebo in men with androgenetic alopecia.
    METHODS: Men aged 20 to 50 years with androgenetic alopecia were randomized to receive dutasteride (0.02, 0.1, or 0.5 mg/d), finasteride (1 mg/d), or placebo for 24 weeks. The primary end point was hair count (2.54-cm diameter) at week 24. Other assessments included hair count (1.13-cm diameter) and width, photographic assessments (investigators and panel), change in stage, and health outcomes.
    RESULTS: In total, 917 men were randomized. Hair count and width increased dose dependently with dutasteride. Dutasteride 0.5 mg significantly increased hair count and width in a 2.54-cm diameter and improved hair growth (frontal view; panel photographic assessment) at week 24 compared with finasteride (P = .003, P = .004, and P = .002, respectively) and placebo (all P < .001). The number and severity of adverse events were similar among treatment groups.
    CONCLUSIONS: The study was limited to 24 weeks.
    CONCLUSIONS: Dutasteride increased hair growth and restoration in men with androgenetic alopecia and was relatively well tolerated.
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  • 文章类型: Journal Article
    BACKGROUND: Testosterone (T) administration to men increases T, estradiol (E2), dihydrotestosterone (DHT), and fat-free mass (FFM), and decreases fat mass (FM) but does not consistently improve insulin sensitivity (IS).
    OBJECTIVE: The aim of this study was to examine the effects of T administration in obese, nondiabetic men on body composition and IS, and to determine if inhibition (i) of metabolism of T to E2 with anastrazole or to DHT with dutasteride alters these effects.
    METHODS: This was a 98-day randomized, double-blind, parallel group, placebo-controlled trial of 57 men, 24-51 year, free T in the lower 25% of normal range (<0.33 nmol/L), body mass index ≥ 30.0 kg/m(2). Subjects were randomized to one of four groups: (i) placebo: gel, pills, and injection; (ii) T/DHT/iE2: T gel, anastrazole, and acyline (gonadotropin releasing-hormone antagonist to suppress endogenous T); (iii) T/iDHT/E2: T gel, dutasteride, and acyline; (iv) T/DHT/E2: T gel, placebo pills, and acyline.
    METHODS: Main outcome measures are insulin sensitivity as percent change (%Δ) in glucose disposal rates (GDR) from a two-step euglycemic clamp (GDR1 and 2), and %FM and %FFM by dual X-ray absorptiometry scan.
    RESULTS: Insulin Sensitivity: %Δ GDR1 differed across groups (P = 0.02, anova) and was significantly higher in the dutasteride (T/iDHT/E2) compared with the placebo and T gel (T/DHT/E2) groups. %ΔGDR2 was higher in the dutasteride (T/iDHT/E2) compared with the anastrazole (T/DHT/iE2) group. Body Composition: T gel alone (T/DHT/E2) or with dutasteride (T/iDHT/E2) significantly increased %FFM (P < 0.05) and decreased %FM (P < 0.05). There was no change in %FFM or %FM after placebo or anastrazole (T/DHT/iE2).
    CONCLUSIONS: The combination of T plus dutasteride improved body composition and IS while T alone improved body composition but not IS, suggesting that when T is administered to men, reduction to DHT attenuates the beneficial effects of aromatization to E2 on IS but not body composition.
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