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Allott BS, Dittmer KE, Kenyon AG, Elder PA. Preliminary investigation of the effect of treating sheep during pregnancy with a vitamin A, D, E formulation on the incidence of vaginal prolapse. N Z Vet J 2019; 68:193-197. [PMID: 31760874 DOI: 10.1080/00480169.2019.1696719] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Aim: To determine if vitamin D3 treatment reduced the incidence of vaginal prolapse in pregnant sheep on a North Canterbury sheep breeding property.Methods: Pregnant ewes from a single farm were allocated to three treatment groups in May 2018. At this time, the first group (EarlyVitADE; n = 512) received an I/M 1 mL dose of 500,000 IU/mL vitamin D3, 60,000 IU/mL vitamin A, and 25 mg/mL vitamin E. This was repeated in July 2018, when the second group (LateVitADE; n = 695) also received the same treatment. The third group (n = 737) were untreated controls. All cases of vaginal prolapse on the property were recorded from pregnancy diagnosis in June 2018 until ewes were set-stocked in August 2018. The planned start of lambing was 10 August 2018.Results: During the period of observation, vaginal prolapses were recorded in 3/699 (0.4%) 2-year-old ewes, and the odds of vaginal prolapse were not associated with treatment group in these ewes (p > 0.3). Amongst ewes aged ≥3 years, during the same period, there were 6/333 (1.8%), 6/443 (1.4%) and 25/469 (5.3%) cases in the EarlyVitADE, LateVitADE and control groups, respectively. Compared to control ewes, the odds of vaginal prolapse were reduced in both the EarlyVitADE (OR = 0.37; 95% CI = 0.15-0.92) and LateVitADE (OR = 0.25; 95% CI = 0.10-0.62) treatment groups.Conclusions and clinical relevance: In this preliminary study, administration of injectable vitamins A, D3, and E to pregnant ewes reduced the incidence of vaginal prolapse during the period from pregnancy diagnosis to set-stocking on one North Canterbury hill-country farm. Due to the restricted data collection period, this investigation should be replicated to better quantify the repeatability of the observed treatment effect over the complete lambing period.
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Affiliation(s)
- B S Allott
- North Canterbury Veterinary Clinics, Amberley, New Zealand
| | - K E Dittmer
- School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - A G Kenyon
- North Canterbury Veterinary Clinics, Amberley, New Zealand
| | - P A Elder
- Endolab, Canterbury Health Laboratories, Christchurch, New Zealand
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2
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Domigan NM, Carr AC, Lewis JG, Elder PA, Winterbourn CC. A monoclonal antibody recognizing the chlorohydrin derivatives of oleic acid for probing hypochlorous acid involvement in tissue injury. Redox Rep 2016; 3:111-7. [DOI: 10.1080/13510002.1997.11747097] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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3
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Fairweather AAC, Eason CT, Elder PA, Eason CMF, Arthur D. Reference concentrations of cholecalciferol in animals: a basis for establishing non-target exposure. New Zealand Journal of Zoology 2013. [DOI: 10.1080/03014223.2013.772527] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- AAC Fairweather
- Science and Technical Group, Department of Conservation, Hamilton, New Zealand
| | - CT Eason
- Faculty of Agriculture and Life Sciences, Department of Ecology, Lincoln University, Canterbury, New Zealand
- Cawthron Institute, Nelson, New Zealand
| | - PA Elder
- Steroid and Immunobiochemistry Unit, Canterbury Health Laboratories, Christchurch, New Zealand
| | - CMF Eason
- School of Population Health, University of Auckland, New Zealand
| | - D Arthur
- Rolleston Veterinary Clinic, Rolleston, Canterbury, New Zealand
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4
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Lewis JG, Jones LM, Legge M, Elder PA. Corticosteroid-binding globulin, cortisol, free cortisol, and sex hormone-binding globulin responses following oral glucose challenge in spinal cord-injured and able-bodied men. Horm Metab Res 2010; 42:882-6. [PMID: 20839151 DOI: 10.1055/s-0030-1265128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Circulating cortisol, corticosteroid-binding globulin, and sex hormone-binding globulin were measured retrospectively in plasma samples following the oral glucose tolerance test in 20 spinal cord-injured men and 20 able-bodied controls. Plasma-free cortisol responses attenuated more rapidly in the able-bodied men, compared to spinal cord-injured subjects, due to significant rise in circulating corticosteroid-binding globulin whereas changes in total plasma cortisol were similar in both groups. The changes in plasma-free cortisol in both groups paralleled changes in insulin and glucose and show that spinal cord-injured men had heightened exposure to free cortisol during this dynamic test. This raises the possibility that the mechanism of abdominal obesity and the propensity towards insulin resistance in spinal cord-injured men could be subtly mediated by perturbations in free cortisol. There were no significant changes in plasma sex hormone-binding globulin in either group.
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Affiliation(s)
- J G Lewis
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand.
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5
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Lewis JG, Shand BI, Frampton CM, Elder PA, Scott RS. Plasma levels of sex hormone-binding globulin, corticosteroid-binding globulin and cortisol in overweight subjects who develop impaired fasting glucose: a 3-year prospective study. Horm Metab Res 2009; 41:255-9. [PMID: 18949680 DOI: 10.1055/s-0028-1087190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Circulating sex hormone-binding globulin (SHBG), corticosteroid-binding globulin (CBG), and total and calculated free cortisol were measured in 206 overweight subjects to investigate whether or not they were markers of insulin resistance. Measurements were carried out on two occasions 36 months apart and subjects were grouped according to fasting plasma glucose. Fifty-one subjects, with a normal basal fasting glucose (<5.6 mmol/l) developed impaired fasting glucose 3 years later (> or = 5.6 mmol/l). Analysis either in toto or based on gender showed a highly significant increase in fasting insulin and insulin resistance, a modest increase in body mass index (BMI), but importantly no change in plasma SHBG, CBG, or cortisol concentrations. Subjects (n=101) with a normal fasting glucose both at baseline (<5.6 mmol/l) and at 36 months showed no significant change in fasting insulin, insulin resistance, SHBG, CBG, cortisol, or BMI. Cross-sectional analysis of the study population showed that plasma SHBG correlated negatively with insulin resistance both in men and women. Overall SHBG at baseline was not predictive of changes in fasting glucose. In females, plasma CBG correlated negatively with BMI. The major finding is that overweight subjects who developed impaired fasting glucose showed no significant change in plasma SHBG, CBG or cortisol, and therefore these indices are probably not early markers of insulin resistance in overweight subjects.
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Affiliation(s)
- J G Lewis
- Steroid and Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand.
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6
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Abstract
Sex hormone-binding globulin (SHBG) and corticosteroid-binding globulin (CBG) circulate in plasma and bind their cognate ligands with high affinity, offering a steroid delivery system to target tissues by a variety of mechanisms. Analysis of these steroid-binding proteins is gaining importance in the clinical setting, although more information is warranted on their diurnal and biological variation. This study shows that plasma SHBG (in normal subjects) exhibits little diurnal or biological variation over the 30 day period studied, in contrast to CBG, where plasma levels peak in the early afternoon. This leads to attenuation of the diurnal free cortisol level rhythm compared to total cortisol. We also show that plasma CBG is significantly lower in male subjects with the metabolic syndrome compared to age-matched lean counterparts, and may therefore act as a surrogate marker of insulin resistance. The consequence of lower levels of CBG in these obese male subjects is reflected by higher levels of circulating free cortisol, potentially offering a more favourable environment for adipogenesis.
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Affiliation(s)
- J G Lewis
- Steroid and Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand.
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7
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Lewis JG, Nakajin S, Ohno S, Warnock A, Florkowski CM, Elder PA. Circulating levels of isoflavones and markers of 5alpha-reductase activity are higher in Japanese compared with New Zealand males: what is the role of circulating steroids in prostate disease? Steroids 2005; 70:974-9. [PMID: 16137729 DOI: 10.1016/j.steroids.2005.06.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2005] [Revised: 04/29/2005] [Accepted: 06/10/2005] [Indexed: 11/27/2022]
Abstract
Epidemiological evidence implicates dietary isoflavone intake as protective against prostate disease. A putative mechanism is attenuated circulating androgen levels in male populations consuming an isoflavone rich diet. We investigated this hypothesis by collecting plasma from 60 Japanese and 60 New Zealand males aged between 21 and 31 years each consuming their traditional diets. We measured plasma testosterone, dihydrotestosterone (DHT), androstenedione, dehydroepiandrosterone sulfate (DHEAS), the combined levels of androsterone sulfate and epiandrosterone sulfate (AoS/epiAoS), sex hormone-binding globulin, and cortisol and corticosteroid-binding globulin as well as the isoflavones genistein and equol. Plasma genistein and equol levels were several times higher in Japanese males as would be expected from an isoflavone rich diet. However, androstenedione, DHEAS, calculated free testosterone and paradoxically markers of 5alpha-reductase, DHT and AoS/epiAoS were all also significantly higher in Japanese rather than the New Zealand male counterparts. All other comparisons were not significant. Plasma DHT and DHEAS correlated positively with plasma equol and plasma AoS/epiAoS correlated positively with genistein levels. Taken together the results suggest that, rather than reduced levels of steroidogenesis, Japanese males may have increased 5alpha-reductase activity and possibly altered 17beta OH steroid dehydrogenase activity. Significantly the positive association between isoflavones levels and 5alpha-steroids is counter-intuitive to isoflavone intake offering prostate protection, unless this is postulated to occur through other mechanisms.
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Affiliation(s)
- J G Lewis
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, P.O. Box 151, Christchurch 8001, New Zealand.
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8
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Lewis JG, Shand BI, Elder PA, Scott RS. Plasma sex hormone-binding globulin rather than corticosteroid-binding globulin is a marker of insulin resistance in obese adult males. Diabetes Obes Metab 2004; 6:259-63. [PMID: 15171749 DOI: 10.1111/j.1462-8902.2004.00343.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM Plasma levels of corticosteroid-binding globulin (CBG) and sex hormone-binding globulin (SHBG) may be regulated by insulin. The aim of this study was to test the hypothesis that these steroid-binding proteins are markers of insulin resistance and obesity in adult patients with the metabolic syndrome. METHODS Fasting blood samples were obtained from 108 male and 88 female overweight adult patients who had varying degrees of dyslipidaemia, adiposity and insulin resistance. We measured plasma levels of SHBG and CBG and investigated their correlation with insulin resistance [homeostasis model assessment (HOMA) % sensitivity] and anthropometric markers of adiposity. RESULTS In male patients, plasma SHBG correlated positively with HOMA (% sensitivity) and negatively with anthropometric measurements, including body mass index, waist circumference (cm) and percentage body fat. There was no correlation with CBG and any other parameter in the male patients. The female patients were treated as two groups, those not using oral contraceptives or hormone replacement therapy (n = 67) and those taking steroid medications (n = 21). Female patients using steroid medications had significantly higher SHBG levels but neither group showed any correlation between SHBG, insulin resistance and adiposity. Correlation studies of CBG with other parameters in the female subgroups did not reach statistical significance. CONCLUSIONS We conclude that plasma SHBG is another surrogate marker for insulin resistance in obese males but not in obese females. It also appears that plasma CBG is not a useful marker of insulin resistance in patients with the metabolic syndrome.
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Affiliation(s)
- J G Lewis
- Steroid and Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand.
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Abstract
AIM Adiponectin is a protein produced exclusively by adipocytes with putative insulin-sensitizing and anti-atherogenic properties. This cross-sectional study investigated the relationship between plasma adiponectin and a range of anthropometric, glycaemic, lipid and inflammatory parameters in overweight and obese subjects expressing characteristics of the metabolic syndrome. METHODS Subjects were selected for the study from a clinical database, if they were non-diabetic, overweight [body mass index (BMI) > 25] and had features of the metabolic syndrome. The subjects were grouped according to BMI (25-30, 31-35 and >35 kg/m2) and then stratified for insulin resistance [homeostasis model assessment (HOMA) %S]. One hundred and ninety-seven patients (109 males and 88 females) were selected for the study by taking an equal number with the highest and lowest HOMA indices from each of the three BMI groups. Plasma adiponectin concentration was measured in duplicate by radioimmunoassay, and the relationship between these levels and the other parameters was investigated using correlation and multiple linear regression analyses. RESULTS Plasma adiponectin concentration was higher in females than males (median 10.3 vs. 7.1 micro g/ml, p < 0.001) despite being matched for BMI. In both genders, adiponectin levels were inversely related to BMI, waist circumference, percentage body fat, insulin resistance and the fasting plasma concentration of leptin. A direct correlation in both sexes was found between adiponectin levels and high-density lipoprotein (HDL)-cholesterol, apolipoprotein A1 and age. Multiple linear regression analyses showed that the independent determinants of low plasma adiponectin concentrations were gender, age, BMI, insulin resistance and HDL-cholesterol. An association between reduced adiponectin and increased high-sensitivity plasma C-reactive protein concentration was observed only in female subjects and was independent of anthropometric variables. Our observation that adiponectin levels increase with age differs from the majority of other studies and may simply reflect the demographics of the population studied. CONCLUSIONS This study shows that adiponectin is an important molecular link between obesity, insulin resistance and atherogenic lipoproteins. It is possible that plasma adiponectin concentration may be a convenient marker for identifying subjects with the metabolic syndrome who may progress to impaired glucose tolerance. Longitudinal studies are required in order to verify this clinical application of adiponectin.
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Affiliation(s)
- B I Shand
- Lipid and Diabetes Research Group, Christchurch Hospital, Christchurch, New Zealand
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Shand BI, Lewis JG, Elder PA, Agarwal M. Antihypertensive treatment and glomerular size selectivity in hypertensive patients with renal parenchymal disease and proteinuria. Clin Nephrol 2002; 58:321-4. [PMID: 12400851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023] Open
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11
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Florkowski CM, Elder PA, Lewis JG, Hunt PJ, Munns PL, Hunter W, Baldwin D. Two cases of adrenal suppression following a Chinese herbal remedy: a cause for concern? N Z Med J 2002; 115:223-4. [PMID: 12064709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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12
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Lewis JG, Elder PA. Abbreviated direct and indirect ELISAs: a new and simple format. Clin Chem 2000; 46:137-9. [PMID: 10620591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
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13
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Lewis JG, Longley NJ, Elder PA. Monoclonal antibodies to human sex hormone-binding globulin (SHBG): characterization and use in a simple enzyme-linked immunosorbent assay (ELISA) of SHBG in plasma. Steroids 1999; 64:259-65. [PMID: 10399882 DOI: 10.1016/s0039-128x(98)00119-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Four monoclonal antibodies to human sex hormone-binding globulin were raised and characterized. Three of the four antibodies recognised different antigenic determinants on SHBG. Two of the distinct antibodies were useful for Western blotting and recognized a major 48 kDa band in human plasma as well as a 46 kDa minor component. Carbohydrate residues do not form part of the antigenic determinants of these two antibodies, although one of these showed increased signal following removal of N-linked oligosaccharides. Some of the antibodies were selected to form a basis of a same-day, non-competitive, enzyme-linked immunosorbent assay (ELISA) for SHBG in plasma. The assay employs a purified IgG2a SHBG monoclonal antibody adsorbed to the wells of a microtitre plate. After blocking any further adsorption to the plate, standards or diluted patient samples were added for a 5-h incubation at room temperature, after which the plate was washed and antibody-bound SHBG was detected with an anti-SHBG IgG1 monoclonal antibody followed by peroxidase-labeled antimouse-IgG1 and o-phenylenediamine substrate. The assay correlated well with an existing 2-day ELISA for SHBG in plasma using polyclonal antibodies and also correlated with a dihydrosterone (DHT) ligand-binding assay. The monoclonal antibody-based ELISA shows excellent performance characteristics and is unaffected by added testosterone or estradiol.
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Affiliation(s)
- J G Lewis
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand.
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14
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Abstract
In Egypt and other regions of the Middle East where the trematode Schistosoma haematobium is endemic, bladder cancer is the most common adult cancer. Unlike bladder cancers in Western countries, which are predominantly transitional-cell carcinoma (TCC), these schistosomiasis-associated bladder cancers are predominantly squamous-cell carcinoma (SCC). Our aim was to assess a large series of schistosomiasis-associated bladder tumours for genetic alterations commonly found in TCC in the United Kingdom and the United States. We have carried out a partial allelotype of 70 tumours from patients with schistosomiasis. LOH was found on all chromosome arms studied (3p, 4p, 4q, 8p, 9p, 9q, 11p, 11q, 13q, 14q, 17p, 18q). The most frequent regions of LOH were 9p (65%), 17p (58%), 3p (40%), 9q (39%) and 8p (37%). LOH on 17p, where the TP53 gene is located, was more common in Egyptian TCC than in SCC. Similarly, 8p LOH was more common in TCC than SCC. The most striking difference between this group of tumours and TCCs from the United Kingdom and the United States was the high frequency of 9p LOH in the region of the CDKN2 gene (65%) and the relatively low frequency of 9q LOH (39%); 15 of 43 tumours with LOH of at least one marker on chromosome 9 showed LOH of 9p only. This suggests that a 9p gene, possibly CDKN2, may contribute to the development of the majority of schistosomiasis-associated bladder tumours but that genes on 9q play a much less important role.
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Affiliation(s)
- M E Shaw
- Molecular Genetics Laboratory, Marie Curie Research Institute, The Chart, Oxted, UK
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15
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Lewis JG, Elder PA. Alternative ELISA for sex hormone-binding globulin in plasma. Clin Chem 1998; 44:1999. [PMID: 9732994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Habuchi T, Luscombe M, Elder PA, Knowles MA. Structure and methylation-based silencing of a gene (DBCCR1) within a candidate bladder cancer tumor suppressor region at 9q32-q33. Genomics 1998; 48:277-88. [PMID: 9545632 DOI: 10.1006/geno.1997.5165] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Loss of heterozygosity (LOH) on chromosome 9q is the most frequent genetic alteration in transitional cell carcinoma (TCC) of the bladder, indicating the presence of one or more relevant tumor suppressor genes. We previously mapped one of these putative tumor suppressor loci to 9q32-q33 and localized the candidate region within a single YAC 840 kb in size. This locus has been designated DBC1 (for deleted in bladder cancer gene 1). We have identified a novel gene, DBCCR1, in this candidate region by searching for expressed sequence tags (ESTs) that map to YACs spanning the region. Database searching using the entire DBCCR1 cDNA sequence identified several human ESTs and a few homologous mouse. ESTs. However, the predicted 761-amino-acid sequence had no significant homology to known protein sequences. Mutation analysis of the coding region and Southern blot analysis detected neither somatic mutations nor gross genetic alterations in primary TCCs. Although DBCCR1 was expressed in multiple normal human tissues including urothelium, mRNA expression was absent in 5 of 10 (50%) bladder cancer cell lines. Methylation analysis of the CpG island at the 5' region of the gene and the induction of de novo expression by a demethylating agent indicated that this island might be a frequent target for hypermethylation and that hypermethylation-based silencing of the gene occurs in TCC. These findings make DBCCR1 a good candidate for DBC1.
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MESH Headings
- Amino Acid Sequence
- Azacitidine/analogs & derivatives
- Azacitidine/pharmacology
- Base Sequence
- Blotting, Northern
- Blotting, Southern
- Carcinoma, Transitional Cell/genetics
- Cell Cycle Proteins
- Chromosomes, Artificial, Yeast
- Chromosomes, Human, Pair 9
- CpG Islands/genetics
- DNA Methylation
- DNA, Complementary
- Decitabine
- Exons/genetics
- Gene Deletion
- Gene Expression Regulation, Neoplastic/drug effects
- Genes, Tumor Suppressor
- Humans
- Introns/genetics
- Molecular Sequence Data
- Nerve Tissue Proteins
- Polymorphism, Single-Stranded Conformational
- Proteins/genetics
- RNA, Messenger/metabolism
- Sequence Analysis, DNA
- Tumor Suppressor Proteins
- Urinary Bladder Neoplasms/genetics
- Urothelium/metabolism
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Affiliation(s)
- T Habuchi
- Molecular Genetics Laboratory, Marie Curie Research Institute, Oxted, Surrey, United Kingdom
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17
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Abstract
Plasma androsterone/epiandrosterone sulfates, dehydroepiandrosterone sulfate, dihydrotestosterone, testosterone, androstenedione, and cortisol were measured in three normal adult men before and following finasteride administration (5 mg/day). Plasma androsterone/epiandrosterone sulfates and dihydrotestosterone declined in parallel to 50% of basal levels with little change in either dehydroepiandrosterone sulfate, cortisol, or androstenedione. The results suggest that the direct measurement of plasma androsterone/epiandrosterone sulfates by enzyme-linked immunosorbent assay provide similar information to plasma dihydrotestosterone and therefore provide a simple alternative for the assessment of 5 alpha-reductase activity.
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Affiliation(s)
- J G Lewis
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand
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18
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Lewis JG, Bason LM, Elder PA. Production and characterization of monoclonal antibodies to dehydroepiandrosterone sulfate: application to direct enzyme-linked immunosorbent assays of dehydroepiandrosterone sulfate and androsterone/epiandrosterone sulfates in plasma. Steroids 1996; 61:682-7. [PMID: 8987136 DOI: 10.1016/s0039-128x(96)00189-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Mice were immunized with 5-androstene-3 beta-ol-7,17-dione-7-CMO:bovine serum albumin (DHEA-7-O-CMO-BSA) or 5-androstene-3 beta-ol-17-one hemisuccinate-bovine serum albumin (DHEA-3HS-BSA) conjugates and monoclonal antibodies were produced, characterized, and selected for maximum DHEAS binding. Of these hybridomas, four clones from DHEA-3HS-BSA-immunized mice had acceptable criteria for the development of a competitive enzyme-linked immunosorbent assay (ELISA) for DHEAS in plasma. One hybridoma supernatant from DHEA-7-O-CMO-BSA-immunized mice showed 360% cross-reactivity to both androsterone sulfate and epiandrosterone sulfate. This allows the possibility of the direct determination of androsterone sulfate and epiandrosterone sulfate in plasma after correction for the DHEAS contribution. Both ELISAs employ a DHEA-3HS-thyroglobulin conjugate adsorbed to the wells of a standard 96-well microtiter plate. DHEAS in the standards or diluted plasma sample competes with immobilized DHEA-3HS-thyroglobulin for antibody-binding sites. Antibody is detected with anti-mouse-lg peroxidase by further washing, adding o-phenylenediamine substrate, and reading the absorbance at 492 nm. The ELISAs are simple, reproducible, and reliable and, to our knowledge, they are the first tests employing monoclonal antibodies to DHEAS.
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Affiliation(s)
- J G Lewis
- Steroid and Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand
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19
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Abstract
We have screened 33 ovarian tumours of various grades and stages for the loss of heterozygosity (LOH) of markers on chromosome 9. LOH was detected in 26 cases (79%). Eleven tumours (33%) showed LOH of all informative markers. The remaining 15 cases had partial deletions. Of these, six (18%) had losses on 9p only, three (9%) had LOH confined to 9q and six (18%) had losses on both chromosome arms, four of which had a retention of hetereozygosity in between. There was no association between tumour grade stage or histopathology and any losses. High-density deletion mapping was carried out in 12 selected cases that had partial deletions of 9p and/or 9q. The deleted region on 9p included the cyclin-dependent kinase inhibitor 2 (CDKN2) locus and one tumour was found to have a homozygous deletion of CDKN2. LOH on 9q extended over a larger region. We found evidence for two regions of deletion on 9q, one at 9q34 and the other encompassing the nevoid basal cell carcinoma (Gorlin) syndrome locus on proximal 9q.
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Affiliation(s)
- J Devlin
- Molecular Genetics Laboratory, Marie Curie Institute, Oxted, Surrey, UK
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20
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Habuchi T, Devlin J, Elder PA, Knowles MA. Detailed deletion mapping of chromosome 9q in bladder cancer: evidence for two tumour suppressor loci. Oncogene 1995; 11:1671-4. [PMID: 7478593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Loss of heterozygosity (LOH) at loci on chromosome 9p and/or 9q is the most frequent genetic alteration in transitional cell carcinoma (TCC) of the bladder. However, localisation of the tumour suppressor locus or loci on 9q has been hampered by the relative infrequency of tumours with subchromosomal deletions. We have used 24 microsatellite markers to examine LOH in 70 new cases of TCC of the bladder and upper urinary tract. Forty tumours (57%) showed LOH at one or more loci on 9q and partial deletions were detected in five tumours (7%). Combined data from the five cases with partial deletions place one tumour suppressor locus at 9q34 between D9S61 and D9S66 (an estimated distance of 13-14 cM). This region is frequently deleted in other sporadic tumours and encompasses one of the loci for tuberous sclerosis (TSC1). One tumour contained a distinct deletion between D9S153 and D9S109 (9q13-q31), which encompasses the locus for the familial nevoid basal cell carcinoma syndrome (Gorlin syndrome). This may indicate the presence of another tumour suppressor locus on 9q for TCC. Our findings significantly reduce the regions of 9q within which suppressor genes for TCC may reside. The possible involvement of two deletion targets on 9q in addition to the locus at 9p21 implicated in TCC may explain why LOH at all loci on chromosome 9 is frequent in TCC.
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Affiliation(s)
- T Habuchi
- Molecular Genetics Laboratory, Marie Curie Research Institute, Oxted, Surrey, UK
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21
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Abstract
The p16 gene has been identified as a candidate tumour suppressor gene at 9p21, a region commonly deleted in bladder cancer. We screened 140 bladder tumours and 16 cell lines for deletions and sequence variants of p16. Eight cell lines showed homozygous deletion of p16 and two had small sequence variations. All 13 tumours with small defined deletions of 9p21, 18/31 (58%) of tumours with monosomy 9 and 9/91 (10%) of tumours with no chromosome 9 loss of heterozygosity had homozygous deletion of p16. No tumour-specific sequence variants were identified. Deletion mapping revealed a nested set of deletions focused on p16. Six deletions involved p16 but not the related and adjacent gene p15 and one tumour had an intragenic deletion of p16. All other deletions involved both p16 and p15. We conclude that p16 represents the major target for deletion at 9p21 in bladder cancer.
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Affiliation(s)
- M P Williamson
- Molecular Genetics Laboratory, Marie Curie Research Institute, Oxted, Surrey, UK
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22
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Elder PA, Bell SM, Knowles MA. Deletion of two regions on chromosome 4 in bladder carcinoma: definition of a critical 750kB region at 4p16.3. Oncogene 1994; 9:3433-6. [PMID: 7970702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Loss of heterozygosity (LOH) of chromosome 4 has been identified in several human tumours including carcinomas of colorectum, ovary, liver and head and neck. LOH at loci on chromosome 4p has previously been identified in 22% of primary bladder tumours. We have assessed LOH in 178 bladder tumours using a panel of six microsatellite markers. Thirty-four tumours (19%) showed LOH at one or more loci. Twenty-three deletions involved restricted regions of 4p and could be used to define two common regions of deletion. A very small common region between D4S43 and D4S127 (estimated to be approximately 750 kB) was involved in 14/23 (61%) of 4p deletions. A second common region centromeric to D4S174 was deleted in 7/23 (30%) of tumours with deletions. Two tumours (9%) had deletions involving both regions independently. Previous functional studies have demonstrated both a senescence function and a suppressor of tumorigenicity on human chromosome 4. Localisation of the common regions of deletion in bladder tumours provides a starting point for positional cloning of the gene(s) concerned and for more precise comparative functional studies.
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Affiliation(s)
- P A Elder
- Molecular Genetics Laboratory, Marie Curie Research Institute, The Chart, Oxted, Surrey, U.K
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23
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Abstract
Plasma progesterone and plasma estradiol levels are commonly used to monitor ovulation in women although for the adequate documentation of ovulation the expense and discomfort of multiple venipuncture sampling may be required. Accurate and definitive information on ovulation in women can be obtained by the simple measurement of metabolites of progesterone and estradiol in early morning urine samples. These analyses have been made possible by the use of our own highly specific monoclonal antibodies to both pregnanediol-3-glucuronide (P-3-G) and estrone-3-glucuronide (E-3-G) and the development of simple, direct, automated enzyme-linked immunosorbent assays. Sequential sampling and the generation of ovulation profiles allows detection of ovulation and identification of the infertile/fertile phases of the cycle for either planned pregnancies or natural family planning. Aberrations in ovulation are easily detected as is documentation of the transition to menopause. The use of sequential, spaced, early morning urine samples for P-3-G and E-3-G allows accurate assessment of ovulatory function rather than relying on the usual single plasma sampling. The data presented also show that the direct determination of plasma pregnanediol-3-glucuronide in plasma is as informative as plasma progesterone measurement.
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Affiliation(s)
- J G Lewis
- Steroid Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand
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24
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Abstract
The mutational spectrum for the TP53 gene was investigated in a large series of bladder tumors and bladder tumor cell lines. Tumors and cell lines were screened for the presence of TP53 point mutations by single-strand conformational polymorphism analysis followed by direct sequencing. Mutations were detected in 16 of 88 (18%) tumors and 4 of 14 cell lines (28%). In total, twelve missense mutations, one nonsense mutation, three deletions, and two insertions were identified by direct sequencing. Of the thirteen point mutations sequenced, only one was a transition at a CpG site, whereas five G:C-->T:A transversions were found, suggesting a major role for exogenous mutagens in bladder tumorigenesis. Tumors were also examined for loss of heterozygosity (LOH) on chromosome arm 17p. LOH of one or more markers on 17p was detected in 31% of tumors. All eight tumors with a TP53 mutation from patients informative at TP53 had LOH, whereas nine tumors with LOH at TP53 did not have an identified mutation. Three tumors had LOH on 17p at sites distal to the TP53 locus but retained both TP53 alleles, suggesting the involvement of another tumor suppressor gene on 17p in bladder tumorigenesis in some tumors.
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Affiliation(s)
- M P Williamson
- Molecular Genetics Laboratory, Marie Curie Research Institute, Oxted, Surrey, United Kingdom
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25
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Knowles MA, Elder PA, Williamson M, Cairns JP, Shaw ME, Law MG. Allelotype of human bladder cancer. Cancer Res 1994; 54:531-8. [PMID: 8275491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
To identify common regions of deletion in human bladder tumors, we have screened 83 cases of transitional cell carcinoma for loss of heterozygosity (LOH) on all autosomal chromosome arms. Seventy-two restriction fragment length polymorphism, variable number of tandem repeats, and minisatellite markers and 18 microsatellite markers were used to obtain a minimum of 50% informative results for each chromosome arm. A mean of 29.6 informative results per patient was obtained from 39 chromosome arms studied, representing information for 76% of chromosome arms. The most frequent losses were apparent monosomies of chromosome 9 (9p, 51%; 9q, 57%). Other frequent losses were on chromosomes 11p (32%), 17p (32%), 8p (23%), 4p (22%), and 13q (15%). LOH of 4p has not been reported previously in bladder carcinoma. The frequency of LOH on all other chromosome arms was < 12%. LOH on chromosome 8p showed a significant association with both high tumor grade and stage, and LOH on 13q showed a significant association with high tumor grade. Fractional allelic loss was calculated for all tumors and had a mean of 0.125 and a median of 0.110. A significant association was found between increased fractional allelic loss and higher tumor grade. An association was also found between LOH of chromosomes 8p and 9q and values for fractional allelic loss > or = the median value. No associations were found between LOH on different pairs of chromosome arms.
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Affiliation(s)
- M A Knowles
- Molecular Genetics Laboratory, Marie Curie Research Institute, Oxted, Surrey, United Kingdom
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26
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Lewis JG, Elder PA. Recycling ovulation markers. N Z Med J 1993; 106:165-6. [PMID: 8386820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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27
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Abstract
A single extraction fixed antigen enzyme-linked immunosorbent assay (ELISA) that can be completed in less than 24 h is described for the measurement of medroxyprogesterone acetate (MPA) in plasma. MPA is covalently coupled to bovine thyroglobulin and passively adsorbed in guanidine hydrochloride to a standard 96-well microtitre plate where it competes with MPA in the extracted plasma sample for goat anti-MPA. Antibody binding to the solid phase is determined via binding of a horse-radish peroxidase second antibody which reacts colorimetrically with its substrate. The reaction is stopped by addition of 1.25 M H2SO4 and absorbance read at 492 nm. All steps except for sample addition and extraction can be performed on an automatic ELISA processing machine. The assay is sensitive, specific and precise, with intra- and inter-assay coefficients of variation of less than 10 and 15%, respectively. Assay sensitivity is 0.08 ng/ml. The assay follows established methodology for other assays in this laboratory which assists standardization, cost structure and sample throughput and thus is a useful alternative to radioimmunoassays for the determination of MPA in plasma.
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Affiliation(s)
- L K Lewis
- Animal and Veterinary Sciences Group, Lincoln University, Canterbury, New Zealand
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28
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Abstract
Cortisol mouse monoclonal antibodies were produced and characterized. Of the four clones studied, supernatant from one clone (A2), compared with other cortisol monoclonal antibodies, showed minimal cross-reactivity to other C21 steroids and was suitable for the direct determination of cortisol in plasma by enzyme-linked immunosorbent assay using a standard 96-well microtiter plate. The enzyme-linked immunosorbent assay uses the immobilized antigen approach, in which cortisol in plasma samples or standards competes with immobilized steroid for antibody-binding sites. After washing, the cortisol antibody bound to the wells of the microtiter plate is detected with antimouse immunoglobulin conjugated to horseradish peroxidase. Following further washing, o-phenylenediamine substrate is added. The enzyme-linked immunosorbent assay is robust and semiautomated. The mean +/- SD recovery from plasma was 97% +/- 6%. Precision studies on three different plasma pools showed mean coefficients of variation of 7.6% and 8.6% for within- and between-assay variation, respectively. The satisfactory performance criteria allow its use in the routine laboratory.
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Affiliation(s)
- J G Lewis
- Department of Clinical Biochemistry, Christchurch Hospital, New Zealand
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29
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Prosser J, Elder PA, Condie A, MacFadyen I, Steel CM, Evans HJ. Mutations in p53 do not account for heritable breast cancer: a study in five affected families. Br J Cancer 1991; 63:181-4. [PMID: 1997094 PMCID: PMC1971779 DOI: 10.1038/bjc.1991.44] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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30
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Coles C, Thompson AM, Elder PA, Cohen BB, Mackenzie IM, Cranston G, Chetty U, Mackay J, Macdonald M, Nakamura Y. Evidence implicating at least two genes on chromosome 17p in breast carcinogenesis. Lancet 1990; 336:761-3. [PMID: 1976143 DOI: 10.1016/0140-6736(90)93236-i] [Citation(s) in RCA: 159] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The DNA of paired tumour and blood leucocyte samples from a large series of breast cancer patients was analysed to map regions of loss of heterozygosity on chromosome 17. The high frequency of loss of heterozygosity on 17p was confirmed, and a third of informative tumours had also lost an allele at the long arm locus THH59. On the short arm two distinct regions of loss of heterozygosity were identified, in bands p13-3 and p13-1. The latter probably involves the structural gene p53, which has been implicated as an oncogene or as a tumour suppressor in various human cancers. 17p 13-3, however, showed a significantly higher frequency of loss of heterozygosity, and there was no correlation between allele losses at the two sites. Nevertheless, loss of heterozygosity at 17p 13-3 is associated with overexpression of p53 mRNA, suggesting the existence of a gene some 20 megabases telomeric of p53 that regulates its expression. Lesions of this regulatory gene seem to be involved in the majority of breast cancers.
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Affiliation(s)
- C Coles
- Medical Research Council Human Genetics Unit, Western General Hospital, Edinburgh, UK
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31
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Elder PA, Manley L, Lewis JG. Use of a monoclonal antibody to estrone-3-glucuronide in an enzyme-linked immunosorbent assay (ELISA). J Steroid Biochem 1990; 36:439-43. [PMID: 2170764 DOI: 10.1016/0022-4731(90)90085-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A direct urinary ELISA for estrone-3-glucuronide has been produced following cloning and characterisation of a monoclonal antibody to the above estrogen metabolite. The ELISA follows our established pattern of absorbing a thyroglobulin conjugate, to which estrone-3-glucuronide has been coupled, to the wells of a microtitre plate using guanidine hydrochloride. A competition reaction between either standards/samples and the adsorbed hormone compete for antibody combining sites. The assay is completed by addition of an anti-mouse Ig-peroxidase complex and read at 492 nm following additions of O-phenylenediamine substrate in under 4 h. The correlation between urinary "total estradiol" and "total estrone and estradiol" is very good and, in conjunction with our ELISA for pregnanediol glucuronide, has allowed for the improved clinical management of infertile and subfertile women.
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Affiliation(s)
- P A Elder
- Department of Clinical Biochemistry, Christchurch Hospital, New Zealand
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32
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Abstract
Monoclonal antibodies to pregnanediol-3-glucuronide were produced and characterized. One of three clones investigated provided antibody suitable for a direct urinary enzyme-linked immunosorbent assay (ELISA). The ELISA uses a pregnanediol-thyroglobulin conjugate adsorbed onto the wells of a standard 96-well microtiter plate. Pregnanediol-3-glucuronide in standards or diluted urine competes with the immobilized steroid for antibody-binding sites. After washing, mouse monoclonal antibody bound to the plate is probed with antimouse immunoglobulin peroxidase. After further washing, o-phenylenediamine substrate is added and, finally, the absorbance is read at 492 nm. The ELISA shows excellent performance and agreement with the previous gas chromatographic method. The ELISA is ideal for aiding the assessment of ovarian function in the routine laboratory.
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Affiliation(s)
- J G Lewis
- Department of Clinical Biochemistry, Christchurch Hospital, New Zealand
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33
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Abstract
A mouse was immunised with an antigen(s) purified by oestradiol-Sepharose affinity chromatography of pooled oestrogen-receptor positive cytosols from human breast cancer tissue. One antibody secreting clone was identified which precipitated labelled antigen and which also stained MCF-7 cells. Culture supernatant and ascites fluid were used for immunofluorescence, SDS-PAGE-Western blotting, photoaffinity labelling and binding studies. The antibody staining of MCF-7 cells was inhibited by preincubation in oestrogen-receptor positive cytosol but was unaffected by oestrogen-receptor negative cytosol. MCF-7 cells stained whether cultured in the presence or absence of oestradiol. The oestrogen-receptor negative cell lines MDA-MB-231 and MDA-MB-330 did not stain. Binding studies with 16-alpha-iodooestradiol using breast cancer tissue cytosols followed by immunoprecipitation showed activity only with oestrogen-receptor positive cytosols with optimal binding activity at 4 degrees C, unaffected by molybdate, but reduced at 25 degrees C or in the presence of 0.4 M KCl. Binding studies with MCF-7, MDA-MB-231 and MDA-MB-330 cytosols and nuclear fractions only showed activity with the MCF-7 cytosol and MCF-7 particulate fractions. The antibody recognised a 48 K species in both MCF-7 cytosol and nuclear fractions but not in the cytosol and nuclear extracts of oestrogen-receptor negative cell lines. Photoaffinity labelling using 16 alpha-iodooestradiol suggests the 48 K antigen does not bind oestradiol directly. The relationship of this antigen to the classical oestrogen-receptor and receptor complex awaits further clarification.
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Affiliation(s)
- J G Lewis
- Department of Clinical Biochemistry, Christchurch Hospital, New Zealand
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34
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Borjesson BW, Cauchi MN, Compton PJ, Elder PA, Foo TM, Gramacho C, Hähnel R, Harrison LC, Holdaway IM, Horsfall DJ. Sources of improvement in between laboratory variation in estrogen and progestin receptor measurement using tissue samples during the Australian Quality Assurance Programme. Eur J Cancer Clin Oncol 1989; 25:1087-93. [PMID: 2668010 DOI: 10.1016/0277-5379(89)90393-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Tissue and cytosol samples were compared as quality control material for assessment of between and within laboratory error in measurement of estrogen and progestin receptors (ER and PR) in a series of four trials for a total of 17 participating laboratories during the Australasian Quality Assurance Programme. For tissue samples, a substantial reduction in between laboratory CVs for both ER and PR from about 90 to 50% was achieved during the programme. In contrast, for cytosol samples a substantially lower between laboratory CV of about 30% was obtained. Tissue sample heterogeneity could be excluded as a major source of variation between laboratories. The likely source of the observed improvement in CV for tissue samples during the trials was due to a reduction of the initial under-estimation of receptor concentration in tissue samples by some of the participants. Although cytosol preparation from tissue samples was shown to be one major source of error, other sources of error such as the receptor assay itself and the associated protein measurements were identified. It is concluded that fragmented tissue samples are essential for a realistic assessment of between laboratory error in receptor measurements in biopsy material such as obtained from clinical breast cancer samples.
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Affiliation(s)
- B W Borjesson
- Garvan Institute of Medical Research, St. Vincent's Hospital, Darlinghurst, N.S.W., Australia
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35
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Abstract
Tumour and blood leucocyte DNA from a consecutive series of patients with primary breast cancer was probed to detect deletions at six polymorphic loci in tumour tissue. The highest frequency of allele loss (61%) was found with the probe YNZ22, which detects a sequence on the short arm of chromosome 17 (at p13.3). The previously reported loss of alleles at the Harvey ras locus (11p14) in about 20% of breast tumours was confirmed. The putative breast tumour suppressor gene on 17p may be the same as that already noted for colon and lung cancers and it is suggested that deletion of this gene is one of a cumulative series of lesions involving genetic changes in the evolution of breast cancer. The findings identify chromosome 17p as a candidate region for linkage studies in breast cancer families.
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Affiliation(s)
- J Mackay
- MRC Human Genetics Unit, Western General Hospital, Edinburgh
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36
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Mackay J, Elder PA, Porteous DJ, Steel CM, Hawkins RA, Going JJ, Chetty U. Partial deletion of chromosome 11p in breast cancer correlates with size of primary tumour and oestrogen receptor level. Br J Cancer 1988; 58:710-4. [PMID: 3066395 PMCID: PMC2246883 DOI: 10.1038/bjc.1988.295] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
In a study of DNAs from 100 breast cancer patients and 100 controls, there were no differences in the frequencies of common or rare alleles at the Harvey ras (c-Ha-ras) locus on chromosome 11. However, one Ha-ras allele was deleted from the tumour DNA in 14 of 65 informative patients. Loss of a Ha-ras allele correlates with paucity of oestrogen receptor protein and with increased tumour size at presentation, but is not associated with microscopic evidence of lymph node invasion. The findings on Ha-ras and other informative loci are consistent with the possibility that a tumour suppressor gene involved in the early stages of breast cancer is located on the short arm of chromosome 11.
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Affiliation(s)
- J Mackay
- MRC Clinical and Population Cytogenetics Unit, Western General Hospital, Edinburgh, UK
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37
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Elder PA, Yeo KH, Lewis JG. An ELISA for 17 alpha hydroxyprogesterone. Steroids 1988; 52:427-8. [PMID: 3250046 DOI: 10.1016/0039-128x(88)90180-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- P A Elder
- Department of Clinical Biochemistry, Christchurch Hospital, New Zealand
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38
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Abstract
We report an automated ELISA method for the measurement of 17 alpha-hydroxyprogesterone in plasma samples. A rabbit antiserum raised against 17 alpha-hydroxyprogesterone-3-(O-carboxymethyl)oxime-bovine serum albumin is used for the assay and a homologous competitor 17 alpha-hydroxyprogesterone-3-(O-carboxymethyl)oxime-bovine thyroglobulin is coated onto a microtitre plate. A goat anti-rabbit IgG-horse radish peroxidase is used as a probe for this solid-phase assay. The assay exhibits good sensitivity, precision and accuracy. The method is used routinely for the management of patients with congenital adrenal hyperplasia.
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Affiliation(s)
- K H Yeo
- Department of Clinical Biochemistry, Christchurch Hospital, New Zealand
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39
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Joyce PR, Sellman JD, Donald RA, Livesey JH, Elder PA. The unipolar-bipolar depressive dichotomy and the relationship between afternoon prolactin and cortisol levels. J Affect Disord 1988; 14:189-93. [PMID: 2966833 DOI: 10.1016/0165-0327(88)90062-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Afternoon prolactin and cortisol levels were measured in 29 patients suffering from a current major depressive episode. Among the 15 unipolar depressed patients the afternoon prolactin and cortisol levels were positively correlated, but 14 bipolar depressed patients did not show a similar relationship, and had prolactin levels lower than the unipolar patients. This finding adds to the growing list of ways in which the neurobiology of bipolar and unipolar depression may differ.
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Affiliation(s)
- P R Joyce
- Affective Disorders Unit, Sunnyside Hospital, Christchurch, New Zealand
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40
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Lewis JG, Elder PA. Affinity chromatography using competitive elution separates polyclonal glucocorticoid antisera into fractions of varying cross-reactivity. J Steroid Biochem 1988; 29:191-5. [PMID: 3347058 DOI: 10.1016/0022-4731(88)90265-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Affinity chromatography of glucocorticoid antisera using cross-reacting steroid-Sepharose columns and competitive elution with the immunising steroid has allowed the separation of polyclonal antibodies into fractions of varying cross-reactivity. Elution was at neutral pH in the presence of 20% acetonitrile followed by dissociation of the eluted immunoglobulin-steroid complex, by dialysis. A polyclonal cortisol antibody with an initial 70% cross-reactivity to 11-deoxycortisol yielded a fraction with 10% cross reactivity and improved affinity. This fraction was suitable for determining plasma cortisol on patients undergoing the metyrapone test whereas another fraction of similar affinity but higher cross reactivity to 11-deoxycortisol, as well as the intact antiserum, grossly over-estimated plasma cortisol on these patients. This technique should permit the use of antibody fractions for immunoassay when the intact antiserum may be unsatisfactory due to lack of specificity.
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Affiliation(s)
- J G Lewis
- Department of Clinical Biochemistry, Christchurch Hospital, New Zealand
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41
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Abstract
As it has been suggested that calculating the ratio of cortisol to its biosynthetic precursor, 11-deoxycortisol, may enhance the sensitivity of the dexamethasone suppression test (DST) for depression, cortisol and 11-deoxycortisol were measured in 90 subjects undergoing this test. Among these subjects, post-dexamethasone cortisol and 11-deoxycortisol levels were significantly correlated (r = 0.65, P less than 0.001) and evaluating the ratio of cortisol to 11-deoxycortisol decreased rather than enhanced sensitivity of the DST.
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Affiliation(s)
- P R Joyce
- Affective Disorders Unit, Sunnyside Hospital, Christchurch, New Zealand
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42
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Ross GS, Elder PA, McWha JA, Pearce D, Pharis RP. The development of an indirect enzyme linked immunoassay for abscisic Acid. Plant Physiol 1987; 85:46-50. [PMID: 16665681 PMCID: PMC1054200 DOI: 10.1104/pp.85.1.46] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
An indirect method of enzyme-linked-immunosorbent-assay (ELISA) is reported for abscisic acid (ABA), utilising a thyroglobulin-ABA conjugate for coating wells. The assay can use commercially available monoclonal antibodies, is sensitive to as little as 20 picograms ABA per well, and is much more conservative of antibody than direct methods. The most dilute ABA standards did not retain their antigenicity during storage, so ABA standard sets were diluted immediately prior to use. The indirect ELISA was used successfully to estimate ABA concentrations in developing cotyledons of Pisum sativum L., after only little preliminary purification. It was validated for this tissue through the use of gas chromatography-electron capture detection (GC-EC), and capillary GC-selected ion monitoring (GC-MS-SIM) using [(2)H(6)]ABA as an internal standard. Full spectrum GC-mass spectrometry was also used to verify that ABA was present in a sample assayed quantitatively by both ELISA and GC-MS-SIM.
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Affiliation(s)
- G S Ross
- Department of Agricultural Botany, The Queen's University of Belfast, Belfast BT9 5PX, Northern Ireland
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43
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Joyce PR, Brinded PJ, Sellman D, Donald RA, Elder PA. The dexamethasone suppression test in psychiatry. N Z Med J 1987; 100:173-5. [PMID: 3452036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The dexamethasone suppression test (DST) for depression (melancholia) has been the focus of considerable recent interest because of claims that it may be a sensitive and specific biological marker for melancholia. When the data from four separate studies were combined, 52% of our patients with major depression were DST nonsuppressors. However, nonsuppression was also observed in 11% of manic patients, 20% of schizophrenic patients and 15% of nondepressed abstinent alcoholics. These results, in conjunction with other reports, suggest that the specificity of the test is not sufficiently high to make it a satisfactory general diagnostic test.
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Affiliation(s)
- P R Joyce
- Affective Disorders Unit, Sunnyside Hospital, Christchurch
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44
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Elder PA, Yeo KH, Lewis JG, Clifford JK. An enzyme-linked immunosorbent assay (ELISA) for plasma progesterone: immobilised antigen approach. Clin Chim Acta 1987; 162:199-206. [PMID: 3829423 DOI: 10.1016/0009-8981(87)90451-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A single extraction ELISA for plasma progesterone is described using the fixed antigen approach. Progesterone is covalently coupled to bovine thyroglobulin and adsorbed onto a 96-well microtitre plate in guanidine hydrochloride. The assay, performed on an automatic ELISA processor, follows an established methodology used for other steroid hormones analysed in this laboratory with concomitant advantages in assay standardisation, cost structure and result throughput. A comparison with an established RIA shows the assay to be rapid, of similar specificity and accuracy with a sensitivity of less than 0.5 nmol/l and is suitable for use in a routine endocrine laboratory for determination of luteal function.
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45
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Abstract
Daytime plasma cortisol levels in four rapid cycling bipolar affective disorder patients were measured longitudinally over multiple affective episodes, and changes in levels with mood state assessed for each individual patient. While three of the four patients had, as expected, increased cortisol levels during depression, higher cortisol levels were also found in the days immediately preceding depressive episodes. Daytime cortisol levels in mania were more variable but were lower in mania for two of the patients. It is hypothesized that in the early stages of mania decreased cortisol levels reflect early neurochemical changes, but that, as manic episodes become dysphoric and/or severe, elevated cortisol levels occur.
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46
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Robertson JM, Lewis JG, Elder PA. Separation methods in the estrogen-receptor assay: dextran-coated charcoal compared with glass fibre. Clin Chem 1986; 32:2104-5. [PMID: 3779961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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47
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Lewis JG, Elder PA, Yeo KH. A monoclonal antibody to prednisone: use of enzyme-linked immunosorbent assay (ELISA) for screening and characterization of antigenic determinants. J Steroid Biochem 1986; 25:659-63. [PMID: 2432355 DOI: 10.1016/0022-4731(86)90008-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
ELISA technology using immobilized steroid conjugates has allowed the rapid screening and characterization of hybridoma supernatants. Although cortisol-3CMO-BSA was the immunogen, a monoclonal antibody with exceptionally high cross-reactivity (greater than 1000%) to prednisone was obtained. Characterization of the antigenic determinants shows a requirement for overall glucocorticoid 21-hydroxyl and 17 alpha-hydroxyl groups with additional high specificity for the 1,2-double bond and 11-position. There is potential use for this antibody in the assay of prednisone.
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Robertson JM, Lewis JG, Elder PA. Separation methods in the estrogen-receptor assay: dextran-coated charcoal compared with glass fibre. Clin Chem 1986. [DOI: 10.1093/clinchem/32.11.2104a] [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: 11/12/2022]
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Abstract
An enzyme-linked immunosorbent assay (ELISA) for 11-deoxycortisol is described for the first time. 11-Deoxycortisol-thyroglobulin conjugate is adsorbed onto the wells of a 96-well ELISA plate and competes with 11-deoxycortisol in the standards or plasma extract for antibody binding sites. After washing, immobilized primary antibody is probed with peroxidase-labeled goat anti-rabbit IgG. The ELISA plate is further washed and o-phenylenediamine added, color developed and the absorbance read at 492 nm. The ELISA shows good agreement with our existing 11-deoxycortisol radioimmunoassay (RIA) and has similar specificity and performance which allow its use in the routine steroid laboratory for assessing pituitary adrenal function by the metyrapone test.
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