An LC-MS/MS analysis for seven sex hormones in serum.

BACKGROUND: Comprehensive serum sex hormone profiling is essential for monitoring the occurrence and development of many related diseases. However, the current methods for multi-class sex hormone detection were always lack of Standard Reference Material (SRM) certification and suffered from large sample consumption. For improvement, we developed a new liquid chromatography-tandem mass spectrometry (LC-MS/MS) method focused on SRM certification and minimization of serum consumption for simultaneous quantification of seven mainstream serum sex hormones including estrogens (estrone E1, estradiol E2 and estriol E3), androgens (testosterone T, androstenedione AD, dehydroepiandrosterone DHEA) and progestogens (progesterone P). METHODS: To achieve one-batch analysis, a straightforward strategy was designed and carefully optimized. Schematically, serum was firstly spiked with isotope-labeled internal standards. Then, liquid-liquid extraction was performed with methyl tert-butyl ether. After drying under nitrogen, dansyl chloride was introduced for derivatization. Finally, the mixture was submitted to LC-MS/MS for quantification. RESULTS: The limit of quantification was 0.005 ng/mL for E1, E2 and E3, 0.01 ng/mL for T, P and AD, 0.25 ng/mL for DHEA. Inter- and intra-assay CVs were less than 11.8%. The selectivity was proved satisfactory by interference spiking tests. With systematical SRM validation, the mean bias of -5.4 to 4.7% was observed, which indicated excellent method reliability. We found significant positive bias in chemiluminescence immunoassay (CLIA) detection comparing with current method, which promoted us to reconsider our previous results on sex hormone regulation in male patients with coronary atherosclerotic disease. After redetecting the related samples, modified and improved conclusions were proposed. CONCLUSIONS: A LC-MS/MS method for multi-class serum sex hormone profiling was developed with SRM certification and minimized serum consumption. Taking advantages of such reliable method, the previous CLIA-based research findings on sex hormone regulation in male patients with coronary atherosclerosis were modified and improved after redetecting the same sample-pool.

Urinary nandrolone metabolites of endogenous origin in man: a confirmation by output regulation under human chorionic gonadotropin stimulation.

19-Nortestosterone (nandrolone) is an anabolic steroid compound widely used as a doping agent by athletes. The analysis of its urinary metabolites, 19-norandrosterone (NA) and 19-noretiocholanolone (NE) glucuronides, allows the detection of surreptitious administration of nandrolone in sport. A threshold concentration at 2 microgram/L urinary nandrolone metabolites is advocated by the International Olympic Committee for the detection of doping, but some controversy concerning the validity of this threshold arose from the demonstration of endogenous production of nandrolone in mammals, including humans. The regulation of human nandrolone production and its contribution in vivo to the process of aromatization remain unknown. In the present study 10 healthy men were successively submitted to insulinic stress and gonadal stimulation by hCG administration. Urinary NA and NE concentrations were quantified by gas chromatography-mass spectrometry. NA was detected in basal urine samples from all subjects, with a mean urinary excretion rate (UER) of 3.17 +/- 0.35 ng/h, whereas NE was detected in 4 of 10 (UER range, 0.8-4.7 ng/h). Insulinic hypoglycemia did not significantly modify mean NA UER despite random intraindividual variations between timed urine collections. After hCG administration, NA UER increased by 250% (P < 0.01) and estradiol (E(2)) UER by 260% (P < 0.001). The maximum NA concentration obtained after stimulation was 0.43 microgram/L. NA UER, plasma E(2), and E(2)/T ratio peaked on day 1 after hCG administration, whereas plasma T peaked later on day 3. NA UER correlated with plasma E(2) (r = 0.61; P < 0.001) and E(2)/T (r = 0.51; P < 0.001), but not with plasma T. In conclusion, insulinic stress did not significantly alter nandrolone metabolism, whereas the effect of hCG was a stimulation of NA excretion in all subjects, which constitutes strong support for the endogenous origin of low basal NA excretion. The comparative kinetics of NA UER, plasma E(2), and E(2)/T ratio suggest a contribution of the aromatase process to nandrolone biosynthesis in man.

5α-Estrane-3ß,17ß-diol and 5ß-estrane-3α,17ß-diol: definitive screening biomarkers to sign nandrolone abuse in cattle?

17ß-Nandrolone (17ß-NT) is one of the most frequently misused anabolic steroids in meat producing animals. As a result of its extensive metabolism combined with the possibility of interferences with other endogenous compounds, detection of its illegal use often turns out to be a difficult issue. In recent years, proving the illegal administration of 17ß-NT became even more challenging since the presence of endogenous presence of 17ß-NT or some of its metabolite in different species was demonstrated. In bovines, 17α-NT can occur naturally in the urine of pregnant cows and recent findings reported that both forms can be detected in injured animals. Because efficient control must both take into account metabolic patterns and associated kinetics of elimination, the purpose of the present study was to investigate further some estranediols (5α-estrane-3ß,17ß-diol (abb), 5ß-estrane-3α,17ß-diol (bab), 5α-estrane-3ß,17α-diol (aba), 5α-estrane-3α,17ß-diol (aab) and 5ß-estrane-3α,17α-diol (baa)) as particular metabolites of 17ß-NT on a large number of injured (n=65) or pregnant (n=40) bovines. Whereas the metabolites abb, bab, aba and baa have previously been detected in urine up to several days after 17ß-NT administration, the present study showed that some of the isomers abb (5α-estrane-3ß,17ß-diol) and bab (5ß-estrane-3α,17ß-diol) could not be detected in injured or pregnant animals, even at very low levels. This result may open a new way for the screening of anabolic steroid administration considering these 2 estranediols as biomarkers to indicate nandrolone abuse in cattle.