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Scott SN, Siguencia M, Stanczyk FZ, Hartmann MF, Wudy SA, White M, Chung WK, Santella RM, Terry MB, Houghton LC. Urinary Androgens Provide Additional Evidence Related to Metabolism and Are Correlated With Serum Androgens in Girls. J Endocr Soc 2024; 8:bvad161. [PMID: 38234314 PMCID: PMC10790961 DOI: 10.1210/jendso/bvad161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Indexed: 01/19/2024] Open
Abstract
Context Androgen levels are generally measured in serum samples, but urine may be a more feasible option, especially in children, as it is a noninvasive alternative. Objective To assess the correlations of 10 urinary androgen metabolites with 4 serum androgens [dehydroepiandrosterone-sulfate (DHEA-S), androstenedione, and total and free testosterone] and assess if their correlations differ by participant characteristics. Methods Our study consisted of 44 girls, ages 6-13, who participated in the New York site of the LEGACY Girls Study and had both serum and urine samples collected at the same visit. We performed Pearson's correlation coefficient tests between 4 serum and 10 individual urinary metabolite measures and their sum. We examined the influence of participant characteristics on the magnitude and direction of the correlations. Results The summed urinary metabolite measures had the highest correlation with free testosterone in serum (global sum, r = 0.83) and correlated least with DHEA-S in serum (global sum, r = 0.64). The correlation between individual urinary metabolites and serum androgens ranged from 0.08 to 0.84.Two 11-oxygenated urinary metabolites (5α-androstane-3α-ol-11,17-dione5β-androstane-3α,11β-diol-17-one) were weakly correlated with all serum androgens. Participant age, weight, height, waist:hip ratio, and pubic hair growth stage changed the correlations between urinary and serum androgens measures between 10% and 213%. Conclusion The sum of urinary androgen metabolites was a good marker of circulating androstenedione, testosterone, and free testosterone. Individual urinary metabolites provide additional information about the metabolic processes of disease development compared to the antecedent serum androgens.
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Affiliation(s)
- Sasinya N Scott
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY 10032, USA
| | - Marvin Siguencia
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY 10032, USA
| | - Frank Z Stanczyk
- Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Michaela F Hartmann
- Steroid Research and Mass Spectrometry Unit, Laboratory of Translational Hormone Analytics in Pediatric Endocrinology, Division of Pediatric Endocrinology & Diabetology, Center of Child and Adolescent Medicine, Justus Liebig University, 35392, Giessen, Germany
| | - Stefan A Wudy
- Steroid Research and Mass Spectrometry Unit, Laboratory of Translational Hormone Analytics in Pediatric Endocrinology, Division of Pediatric Endocrinology & Diabetology, Center of Child and Adolescent Medicine, Justus Liebig University, 35392, Giessen, Germany
| | - Melissa White
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY 10032, USA
| | - Wendy K Chung
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032, USA
- Departments of Pediatrics and Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - Regina M Santella
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032, USA
- Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY 10032, USA
| | - Mary Beth Terry
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY 10032, USA
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032, USA
| | - Lauren C Houghton
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY 10032, USA
- Herbert Irving Comprehensive Cancer Center, Columbia University Medical Center, New York, NY 10032, USA
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Stanczyk FZ, Mandelbaum R, Baker M, Ma L, Sriprasert I, Dancz CE, Legro RS. Quantitation of 5α-Androstanedione in Normal Women and Women with PCOS. J Steroid Biochem Mol Biol 2023; 231:106289. [PMID: 36972792 DOI: 10.1016/j.jsbmb.2023.106289] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/06/2023] [Accepted: 03/08/2023] [Indexed: 03/28/2023]
Abstract
In vitro studies show that 5α-androstane-3,17-dione (5α-A) is an important intermediate in the formation of dihydrotestosterone (DHT) from androstenedione (A) in women and men. Many studies involving hyperandrogenism, hirsutism, and polycystic ovary syndrome (PCOS) have measured A, testosterone (T), and DHT, but not 5α-A due to lack of a readily available assay to quantify this androgen. We have developed a specific and sensitive radioimmunoassay to measure 5α-A levels, together with A, T, and DHT, in both serum and genital skin. The present study involves 2 cohorts. Cohort 1 included 23 mostly postmenopausal women who provided both serum and genital skin to measure those androgens. In cohort 2, serum androgen levels were compared between women with PCOS and non-PCOS controls. Tissue-to-serum ratios were significantly higher for 5α-A and DHT as compared to A and T. None of the androgens showed a significant correlation between serum and genital tissue. In serum, 5α-A was significantly correlated with A, T, and DHT. In cohort 2, A, T, and DHT were significantly higher in the PCOS group compared to the control group. In contrast, 5α-A levels were similar between the 2 groups. Our findings support the view that 5α-A is an important intermediate in DHT formation in genital skin. Also, the relatively low levels of 5α-A in PCOS women suggest that it may play a more important intermediate role in the conversion of A to androsterone glucuronide.
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Affiliation(s)
- Frank Z Stanczyk
- Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States.
| | - Rachel Mandelbaum
- Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Marsha Baker
- Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Lihong Ma
- Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Intira Sriprasert
- Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Christina E Dancz
- Department of Obstetrics and Gynecology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Richard S Legro
- Department of Obstetrics and Gynecology, Penn State Health Milton S. Hershey Medical Center, Hershey, PA, United States
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Benabdelaziz A, Boudjemai S, Benzaid A, Khelili R, Kaidi R. In-House Preparation and Evaluation of125I-Histamine Progesterone Tracer for Radioimmunoassay of Progesterone. J Immunoassay Immunochem 2014; 36:478-86. [DOI: 10.1080/15321819.2014.996816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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4
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Wistuba J, Nieschlag E, Semjonow A, Sandhowe-Klaverkamp R, Friderichs-Gromoll S, Zitzmann M, Simoni M, Luetjens CM. Testosterone-Induced Prostate Growth Is Blocked by Co- and Preadministration of Norethisterone Enanthate in Castrated Cynomolgus Monkeys. Urol Int 2012; 88:358-64. [DOI: 10.1159/000335209] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Accepted: 11/20/2011] [Indexed: 11/19/2022]
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Pala A, Marinelli G, D'intinosante V, Ruzza AD, Carenza L. Preparation of 2-125I-Testosterone and Its Use as Ligand for Radioimmunoassay in Serum. ANAL LETT 2006. [DOI: 10.1080/00032718208064393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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6
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Law B, Mason PA, Moffat AC, King LJ. Preparation of 2-[125I] iodohistamine-labelled Δ8-tetrahydrocannabinol-11-oic acid for use in cannabinoid radioimmunoassay. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580190804] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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7
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Inês M, Santoro RM, Kassab NM, Hasegawa M, Kedor-Hackmann ERM. Determination of steroid hormones in oral contraceptives by high-performance liquid chromatography. Drug Dev Ind Pharm 2002; 28:741-7. [PMID: 12149967 DOI: 10.1081/ddc-120003866] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The aim of this research was to standardize a high-performance liquid chromatographic method for quantitative determination of steroid hormones, like ethinylestradiol (ETE), levonorgestrel (LEVO), and gestodene (GEST), in commercially available oral contraceptives (OCs). The combination ETE-LEVO was analyzed using a LiChrospher 100 RP-8 column (5 microns, 125 x 4 mm) in LiChroCART, with a mobile phase constituted of acetonitrile: water (60:40 v/v). Using the same column, ETE-GEST was analyzed with a mobile phase constituted of acetonitrile:water (50:50 v/v) at pH 7.5 adjusted with 0.02 M ammonium hydroxide. For both methods, a flow rate of 0.8 mL/min was utilized and detection was carried out at 215 nm. All analyses were performed at room temperature (24 +/- 2 degrees C). Calibration curves for ETE-LEVO were obtained using solutions with concentration ranges from 2.40 to 60.0 micrograms/mL (ETE), and from 12.0 to 300.0 micrograms/mL (LEVO). Calibration curves for ETE-GEST were obtained using solutions with concentration ranges from 2.40 to 60.0 micrograms/mL (ETE), and from 9.0 to 160.0 micrograms/mL (GEST). Correlation coefficients obtained were from 0.9999 to 0.9990. Coefficients of variation for samples containing ETE-LEVO were 0.47% and 0.38%, respectively. For samples with ETE-GEST they were 0.39% and 0.44%, respectively. The average recovery for samples with ETE-LEVO was 103.46% and 100.78%, respectively. For samples containing ETE-GEST it was 100.89% and 101.03%, respectively.
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Affiliation(s)
- Maria Inês
- Departamento de Farmácia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Caixa Postal 66083, CEP 05315-970, São Paulo, Brazil.
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Garnuszek P, Dobrowolski J, Mazurek A. Theoretical studies on substitution isomerism and tautomerism in iodo-histamine molecules. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0166-1280(99)00372-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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9
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Garnuszek P, Licinska I, Mazurek AP. Evaluation of radioiodinated histamine as isotope carrier in vivo. Nucl Med Commun 2000; 21:459-68. [PMID: 10874704 DOI: 10.1097/00006231-200005000-00009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The iodo derivative of histamine labelled with 125I has been used for many years to prepare tracers used in RIA systems. The aim of this study was to evaluate radioiodinated histamine as a potential isotope carrier for in vivo applications. The biological behaviour of radioiodinated histamine has been investigated in rodents. The observed absence of any specific iodohistamine uptake by a critical organ or tissue promises a very quick distribution of the iodohistamine in soft tissues, and a rapid rate of whole-body clearance via the urinary tract (e.g. over 50% of the injected dose (ID) during the first hour after administration). In spite of moderately low in vitro stability of iodohistamine in serum, biodistribution studies in rodents have not shown any significant release of iodine from the parent molecule in the whole animal. Low uptake was observed in the thyroid (e.g. 0.22 and 0.11% ID at 1 and 2 h after administration to rats), and not more than 3% of injected activity was detected in the stomach in all of the biodistribution experiments. Moreover, our results refute any possibility of competition between histamine and iodohistamine for receptor binding sites, and suggest that radioactive mono-iodohistamine may be used successfully to develop some new radiolabelled bioactive molecules with potential application in vivo.
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Affiliation(s)
- P Garnuszek
- Radioisotope Drugs Department, Drug Institute, Warsaw, Poland.
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Lapcík O, Hampl R, Hill M, Wähälä K, Maharik NA, Adlercreutz H. Radioimmunoassay of free genistein in human serum. J Steroid Biochem Mol Biol 1998; 64:261-8. [PMID: 9618027 DOI: 10.1016/s0960-0760(97)00199-4] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Two radioimmunoassay (RIA) systems for genistein have been established, based on polyclonal antibodies against genistein-4'-O-(carboxymethyl)ether-bovine serum albumin and genistein-7-O-(carboxymethyl)ether-bovine serum albumin conjugates. The sensitivities of assays were 4.44 and 10.4 fmol (1.2 and 2.8 pg)/tube, respectively, the intraassay coefficients of variation ranged from 3.54 to 9.30%, the interassay C.V. varied from 6.72 to 19.7%, depending on the type of method and on genistein concentration. The cross-reactivities with other chemically related compounds (with exception of genistein derivatives at the position used for construction of the immunogen) were 5.5 and 6.1% for daidzein and 3.9 and 0.04% for formononetin in RIAs using reagents prepared through positions 4'- and 7- of genistein, respectively. The method was used for measurement of genistein levels in 26 omnivore subjects and in three volunteers after consumption of a meal prepared from 125 g of cooked whole soybeans. The values obtained in ether extracts from human sera were almost identical for both RIA systems, indicating that both RIAs measure the same entity.
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Affiliation(s)
- O Lapcík
- Institute of Endocrinology, Prague 1, Czech Republic.
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11
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Abstract
The isoflavonoids, genistein (4',5,7-trihydroxyisoflavone), biochanin A (5,7-dihydroxy-4'-methoxyisoflavone), daidzein (4',7-dihydroxyisoflavone), and formononetin (7-hydroxy-4'-methoxyisoflavone) are supposed to be health-promoting dietary factors of plant origin. They are particularly abundant in seeds and other parts of many plant species belonging to Leguminosae. The most popular source of isoflavonoids in human diet is soy. Here, evidence is presented that isoflavonoids are regularly found in beer. Diethyl ether extracts of beer were fractionated on thin-layer chromatography-silica, (straight phase) and rechromatographed using a reversed phase high-performance liquid chromatography octadecylsilica column. The fractions were analyzed by two recently developed radioimmunoassays, the first of them being specific for diadzein/formononetin and the second one specific for genistein/biochanin A. The immunoreactivity was found only in fractions with the mobility corresponding to the positions of standards on control chromatograms. Additionally, 26 samples of bottled beer were analyzed for isoflavonoid content using the combination of reversed phase high-performance liquid chromatography and radioimmunoassay. The sum of the four isoflavonoids ranged from 1.26 to 29 nmol/L in individual beers. Formononetin was the major isoflavonoid (0.19-14.99 nmol/L), whereas the concentration of daidzein was several times lower (0.08-2.5 nmol/L). Genistein and biochanin A concentrations were comparable, ranging from 0.169-6.74 nmol/L and from 0.820-4.84 nmol/L for genistein and biochanin A, respectively. It is concluded that beer contains significant amounts of biologically active isoflavonoid phytoestrogens.
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Affiliation(s)
- O Lapcík
- Institute of Endocrinology, Prague, Czech Republic
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12
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Abstract
A radioimmunoassay for daidzein was established, based on polyclonal antibodies against daidzein-4'-O-(carboxymethyl)ether-BSA. The sensitivity of the assay was 0.4 pg/tube; the intra- and interassay coefficients of variation varied from 4.1 to 11.5% and from 5.6 to 21.7%, respectively, depending upon the method (direct or extraction) and concentration of daidzein in the sample. The cross reactivities with other chemically related compounds, with the exception of 4'-derivatives of daidzein, were 2.4% for dihydrodaidzein, 1.3% for genistein, 1.5% for biochanin A, and 1.6% for equol, respectively. The method was used for measurement of daidzein levels in 105 normal human subjects and in three volunteers after consumption of a meal prepared from 125 g of cooked whole soybeans. The daidzein values obtained following diethyl ether extraction of human sera was only 8% of that obtained by direct radioimmunoassay. We suggest that this difference is caused by cross-reacting daidzein 4'-glucuronides and -sulfates present in serum. Using ether extraction, the basal serum levels of free daidzein were 0.11 ng/mL (0.43 nmol/L), with 14 subjects showing no detectable levels. Levels were detectable in all subjects with the direct assay with a mean value of 7.1 ng/mL (28.0 nmol/L). Peak levels were reached 4 hours after ingestion of the soybeans. The levels were 10.3 +/- 3.6 ng/mL (40.4 +/- 14.3 nmol/L) for free daidzein and 129.4 +/- 36.1 ng/mL (509 +/- 142 nmol/L) for total immunoreactive compounds. After 24 hours, the levels were still clearly distinguishable from the basal levels; the concentrations were 0.43 +/- 0.15 ng/mL (1.69 +/- 0.59 nmol/L) and 24.36 +/- 6.07 ng/mL (95.9 +/- 23.9) for free and total immunoreactive material, respectively. It is concluded that this is the first immunoassay for a phytoestrogen in human biological fluids, and for the first time serial assays of unconjugated daidzein in plasma have been possible.
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Affiliation(s)
- O Lapcík
- Institute of Endocrinology, Prague, Czech Republic
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13
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Cuilleron CY, Forest MG. Comparison of merits of steroid radioimmunoassays using iodinated or tritiated radioligands. INTERNATIONAL JOURNAL OF RADIATION APPLICATIONS AND INSTRUMENTATION. PART B, NUCLEAR MEDICINE AND BIOLOGY 1990; 17:661-6. [PMID: 2262335 DOI: 10.1016/0883-2897(90)90081-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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14
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Gloning K, Dibbelt L, Kuss E. 2- and 4-iodinated estriol as indicator ligands for estriol radioimmunoassays with anti-estriol-C6 conjugate antiserum. J Immunol Methods 1989; 122:185-93. [PMID: 2794514 DOI: 10.1016/0022-1759(89)90263-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The suitability of 2- and 4-125I-estriol as indicator ligands for estriol determination in radioimmunoassays with anti-estriol-C6 conjugate antiserum was tested and compared to the one of 3H-estriol, estriol-6-(O-carboxymethyl)oxime-125I-histamine and a commercially available 125I-estriol derivative of unknown structure. An ideal radioiodinated tracer would react identically with the analyte and its tritiated analogue and the 4-monoiodo-estriol was found to fulfil these requirements as shown by the pattern of dilution and standard curves obtained with the various labeled ligands. This observation was corroborated by a comparison of the apparent estriol concentrations in human pregnancy sera determined with the different indicator ligands. The experimentally proven advantage of 4-monoiodo-estriol over other iodinated estriol derivatives verifies a hypothesis deduced previously from binding constants obtained with analogous estriol derivatives and the same antiserum.
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Affiliation(s)
- K Gloning
- I Frauenklinik der Universität München, F.R.G
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Bílek R, Hampl R, Putz Z, Stárka L. Radioimmunoassay of epitestosterone: methodology, thermodynamic aspects and applications. JOURNAL OF STEROID BIOCHEMISTRY 1987; 28:723-9. [PMID: 3695520 DOI: 10.1016/0022-4731(87)90404-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A radioimmunoassay system for 17 alpha-hydroxy-4-androstene-3-one (epitestosterone) was developed and evaluated using rabbit antisera against 17 alpha-hydroxy-4-androstene-3-one-3-(O-carboxymethyl)-oxime-bovine serum albumin conjugate, and radioiodinated homologous histaminyl derivative of epitestosterone as a tracer. Two antisera with different specificity were used for radioimmunological determination of epitestosterone in hydrolyzed urine and plasma, respectively. Apparent intrinsic association constants and derived thermodynamic variables for ligand-antibody interaction were measured under various conditions in order to set up an optimal assay protocol. The mean plasma epitestosterone levels for healthy subjects were 0.44 +/- 0.15 nmol.l-1 (means +/- SD) in males and 0.092 +/- 0.056 nmol.l-1 in females. The corresponding concentrations in urine were 320 +/- 70 nmol.l-1 (males) and 273 +/- 100 nmol.l-1 (females).
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Affiliation(s)
- R Bílek
- Research Institute of Endocrinology, Praha, Czechoslovakia
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17
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Bilek R, Hampl R, Putz Z, Stárka L. Preparation and characterization of reagents for epitestosterone radioimmunoassay. J Radioanal Nucl Chem 1987. [DOI: 10.1007/bf02164702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Blye RP, Kim HK, Lindberg MC, Mitra SB, Naqvi RH, Peterson DM, Rao PN. Development and use of a radioimmunoassay for D-(-)-norgestrel 17 beta-cyclopentanecarboxylate. Steroids 1986; 48:27-45. [PMID: 3660438 DOI: 10.1016/0039-128x(86)90039-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The synthesis of the 6 alpha-carboxymethylmercapto BSA and homologous histamine conjugate of D-(-)-norgestrel 17 beta-cyclopentanecarboxylate is reported. Using the BSA conjugate as an immunogen for the development of antibody in the rabbit and the 125I-histamine conjugate as the radioligand, a radioimmunoassay (RIA) for the ester was developed. Serum profiles of the free alcohol and ester were determined following IV or IM injection in macaques. Peak values for the ester (about 12 ng/mL) were observed 2 min following an IV bolus of 0.5 mg in one rhesus monkey. Blood levels dropped rapidly within the first 30 min and were barely detectable at 24 h. Serum levels of the free alcohol rose to a peak at 30 min and then declined slowly to very low values by 24 h. Following IM injection of 20 mg in cynomolgus monkeys, peak levels of the ester were observed within a few days while the free alcohol reached a maximum about day 30. Serum concentrations of D-(-)-norgestrel had fallen to about 0.4 ng/mL 160 days post-injection when levels of the ester fell below 0.2 ng/mL.
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Affiliation(s)
- R P Blye
- National Institutes of Health, Center for Population Research, Bethesda, MD 20892
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Wood P, Groom G, Moore A, Ratcliffe W, Selby C. Progesterone assays: guidelines for the provision of a clinical biochemistry service. Ann Clin Biochem 1985; 22 ( Pt 1):1-24. [PMID: 3885833 DOI: 10.1177/000456328502200101] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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20
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Sauer MJ, Foulkes JA, O'Neill PM. Use of microtitre plate EIA for direct determination of progesterone in whole milk: application of heterologous systems for improved sensitivity. THE BRITISH VETERINARY JOURNAL 1982; 138:522-32. [PMID: 6758918 DOI: 10.1016/s0007-1935(17)30938-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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21
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Corrie JE. Immunoassays for steroid hormones using radioiodinated tracers. THE BRITISH VETERINARY JOURNAL 1982; 138:439-42. [PMID: 7127066 DOI: 10.1016/s0007-1935(17)30990-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Corrie JE, Ratcliffe WA, Macpherson JS. Generally applicable 125 iodine-based radioimmunoassays for plasma progesterone. Steroids 1981; 38:709-17. [PMID: 7336468 DOI: 10.1016/0039-128x(81)90089-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Two methods are described for estimation of plasma progesterone, both employing a heterologous-bridge radioimmunoassay system with anti-sera raised against a progesterone 11 alpha-hemisuccinate conjugate and a radioiodinated progesterone 11 alpha-glucuronide-tyramine conjugate as tracer. Separation techniques based on double antibody methods have been employed to improve assay precision, and the assays described are sensitive, precise, accurate and robust and well suited to the measurement of progesterone levels for routine monitoring of luteal function. Present evidence suggests that the majority of laboratories which already use such antisera could readily adopt this assay system with its advantages of improved performance and gamma-labelled tracer.
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