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Steroids Mar 2020Two valuable forensic tools based on enzyme-linked immunoassays (ELISAs) for the analysis of 17α-methylated steroids were developed using haptens of stanazolol and its...
Two valuable forensic tools based on enzyme-linked immunoassays (ELISAs) for the analysis of 17α-methylated steroids were developed using haptens of stanazolol and its conjugates with biotin. Haptens containing terminal carboxylic group were conjugated to bovine serum albumin (BSA), rabbit serum albumin (RSA) or ovalbumin (OVA). Eight batches of antisera (RAbs) obtained by immunization of rabbits were tested in an indirect competitive ELISA system using immobilization of RSA conjugate (RSA/hapten) and competitor immobilization of the biotinylated conjugate (AB-ELISA) to avidin (avidin/hapten). The best results were achieved with the RAb 212 antibodies in RSA/ST-3 and avidin/ST-10 assembled variants. For the RSA/ST-3 system, an IC of 0.3 ng/mL and a detection limit of 0.02 ng/mL were measured. In case of avidin/ST-10 variant, IC was of 3.9 ng/mL and a detection limit of 0.57 ng/mL were obtained. The effect of solvent was tested as well as the stability of coated microtiter plates over four-month period. The cross-reactivity of the developed assays with other anabolic steroids was tested and high sensitivity towards 17α-methylated steroids was observed. RSA/ST-3 assay showed significant cross-reactivity with 17α-methyltestosterone (81.2%), oxymetholone (30.4%), methandienone (10.0%) and methyl dihydrotestosterone (7.7%). Similarly, in the avidin/ST-10 assay, 17α-methyltestosterone (34.5%), mestanolone (32.1%), oxymetholone (22.7%), methandienone (14.2%), 9-dehydromethyltestosterone (12.5%) and oxandrolone (1.2%) exhibited high cross-reactivity. The functionality of the developed systems was verified by the successful identification of a series of 17α-methylated anabolic steroids in a set of real samples including pharmaceutical preparations seized by the Police of the Czech Republic on the black market.
Topics: Animals; Calibration; Cattle; Enzyme-Linked Immunosorbent Assay; Forensic Medicine; Immune Sera; Methylation; Molecular Conformation; Rabbits; Serum Albumin; Stanozolol; Stereoisomerism; Testosterone Congeners
PubMed: 31812623
DOI: 10.1016/j.steroids.2019.108550 -
British Journal of Haematology Oct 2019
Topics: Adult; Aged; Aged, 80 and over; Androgens; Danazol; Female; Humans; Male; Middle Aged; Myelodysplastic Syndromes; Oxymetholone; Retrospective Studies; Thrombocytopenia; Treatment Outcome; Young Adult
PubMed: 31368111
DOI: 10.1111/bjh.16121 -
Steroids Oct 2019A long-term metabolite of the doping agent oxymetholone (OXM-M2, 17β-hydroxymethyl-2,17α-methyl-18-norandrost-13-en-3-one) which has been identified by GC-MS/MS was...
A long-term metabolite of the doping agent oxymetholone (OXM-M2, 17β-hydroxymethyl-2,17α-methyl-18-norandrost-13-en-3-one) which has been identified by GC-MS/MS was synthesized from commercially available materials. Two efficient synthetic routes to access both C-17 epimers of tentative metabolites were developed. The identity and molecular configuration of the in vivo metabolite: 17β-hydroxymethyl-2α,17α-methyl-18-norandrost-13-en-3-one was confirmed by single crystal X-ray diffraction.
Topics: Crystallography, X-Ray; Humans; Models, Molecular; Molecular Conformation; Oxymetholone
PubMed: 31229510
DOI: 10.1016/j.steroids.2019.108430 -
Andrologia Aug 2019Testicular tissue and sex hormones are sensitive to the anabolic steroids (oxymetholone/OM) due to increased free radical damage and hormonal changes. The Nasturtium...
Testicular tissue and sex hormones are sensitive to the anabolic steroids (oxymetholone/OM) due to increased free radical damage and hormonal changes. The Nasturtium officinale L. have various antioxidant compounds. The aim of the present study was to investigate N. officinale effect on OM-induced oxidative injury in mouse testis and sperm parameters. Thirty BALB/c mice were divided into five groups, including control, OM (5 ml/kg) and three N. officinale doses (25, 50 and 100 mg/kg) + OM. At the end of the study (40 days), serum luteinising hormone (LH), follicle-stimulating hormone (FSH), testosterone, nitric oxide (NO) levels, ferric reducing ability of power (FRAP) and testis stereological factors were measured. The sperm parameters were evaluated. Liquid chromatography-electrospray ionisation-tandem mass spectrometry (LC-ESI/MS) analysis was yielded a fingerprint of N. officinale phenolic constituents. 100 mg/kg of N. officinale extract significantly reduced the serum level of testosterone and a significant increase in LH and FSH in comparison with the control group. This dose also significantly improved the stereological factors and sperm parameters. 50 and 100 mg/kg of N. officinale extract significantly increased the testis tissue FRAP levels, and 100 doses reduced the serum levels of NO. Fourteen compounds and 34 peaks were identified in the extract with LC-ESI/MS. Nasturtium officinale extract has protective effects against testicular toxicity caused by OM.
Topics: Anabolic Agents; Animals; Antioxidants; Chromatography, High Pressure Liquid; Male; Mice; Models, Animal; Nasturtium; Oxidative Stress; Oxymetholone; Plant Extracts; Spectrometry, Mass, Electrospray Ionization; Sperm Count; Spermatozoa; Tandem Mass Spectrometry; Testis; Testosterone
PubMed: 31025410
DOI: 10.1111/and.13294