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Jayaram L, King PT, Hunt J, Lim M, Park C, Hu E, Dousha L, Ha P, Bartlett JB, Southcott AM, Muruganandan S, Vogrin S, Rees MA, Dean OM, Wong CA. Evaluation of high dose N- Acetylcysteine on airway inflammation and quality of life outcomes in adults with bronchiectasis: A randomised placebo-controlled pilot study. Pulm Pharmacol Ther 2024; 84:102283. [PMID: 38141851 DOI: 10.1016/j.pupt.2023.102283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 11/09/2023] [Accepted: 12/11/2023] [Indexed: 12/25/2023]
Abstract
BACKGROUND High dose N acetylcysteine (NAC), a mucolytic, anti-inflammatory and antioxidant agent has been shown to significantly reduce exacerbations, and improve quality of life in placebo controlled, double blind randomised (RCT) studies in patients with COPD, and in an open, randomised study in bronchiectasis. In this pilot, randomised, double-blind, placebo-controlled study, we wished to investigate the feasibility of a larger clinical trial, and the anti-inflammatory and clinical benefits of high dose NAC in bronchiectasis. AIMS Primary outcome: to assess the efficacy of NAC 2400 mg/day at 6 weeks on sputum neutrophil elastase (NE), a surrogate marker for exacerbations. Secondary aims included assessing the efficacy of NAC on sputum MUC5B, IL-8, lung function, quality of life, and adverse effects. METHODS Participants were randomised to receive 2400 mg or placebo for 6 weeks. They underwent 3 visits: at baseline, week 3 and week 6 where clinical and sputum measurements were assessed. RESULTS The study was stopped early due to the COVID pandemic. In total 24/30 patients were recruited, of which 17 completed all aspects of the study. Given this, a per protocol analysis was undertaken: NAC (n = 9) vs placebo (n = 8): mean age 72 vs 62 years; male gender: 44% vs 50%; baseline median FEV11.56 L (mean 71.5 % predicted) vs 2.29L (mean 82.2% predicted). At 6 weeks, sputum NE fell by 47% in the NAC group relative to placebo (mean fold difference (95%CI: 0.53 (0.12,2.42); MUC5B increased by 48% with NAC compared with placebo. Lung function, FVC improved significantly with NAC compared with placebo at 6 weeks (mean fold difference (95%CI): 1.10 (1.00, 1.20), p = 0.045. Bronchiectasis Quality of life measures within the respiratory and social functioning domains demonstrated clinically meaningful improvements, with social functioning reaching statistical significance. Adverse effects were similar in both groups. CONCLUSION High dose NAC exhibits anti-inflammatory benefits, and improvements in aspects of quality of life and lung function measures. It is safe and well tolerated. Further larger placebo controlled RCT's are now warranted examining its role in reducing exacerbations.
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Affiliation(s)
- L Jayaram
- Western Health, Gordon Street, Footscray, VIC, 3011, Australia; University of Melbourne, Parkville, VIC, 3010, Australia.
| | - P T King
- Monash Medical Centre, Clayton Road, Clayton, VIC, 3068, Australia; Monash University, Wellington Road, Clayton, VIC, 3068, Australia
| | - J Hunt
- Western Health, Gordon Street, Footscray, VIC, 3011, Australia
| | - M Lim
- Western Health, Gordon Street, Footscray, VIC, 3011, Australia
| | - C Park
- Western Health, Gordon Street, Footscray, VIC, 3011, Australia
| | - E Hu
- Western Health, Gordon Street, Footscray, VIC, 3011, Australia
| | - L Dousha
- Monash Medical Centre, Clayton Road, Clayton, VIC, 3068, Australia; Monash University, Wellington Road, Clayton, VIC, 3068, Australia
| | - P Ha
- Western Health, Gordon Street, Footscray, VIC, 3011, Australia
| | - J B Bartlett
- Western Health, Gordon Street, Footscray, VIC, 3011, Australia; University of Melbourne, Parkville, VIC, 3010, Australia
| | - A M Southcott
- Western Health, Gordon Street, Footscray, VIC, 3011, Australia; University of Melbourne, Parkville, VIC, 3010, Australia
| | - S Muruganandan
- University of Melbourne, Parkville, VIC, 3010, Australia; Northern Health, Epping, VIC, 3076 Australia
| | - S Vogrin
- University of Melbourne, Parkville, VIC, 3010, Australia
| | - M A Rees
- University of Melbourne, Parkville, VIC, 3010, Australia; Royal Melbourne Hospital, Gratten St, VIC, 3050, Australia
| | - O M Dean
- Deakin University, IMPACT - the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, 3220 Australia; Florey Institute for Neuroscience and Mental Health and the Department of Psychiatry, The University of Melbourne, VIC , 3010, Australia
| | - C A Wong
- Middlemore Hospital, Te Whatu Ora, Otahuhu, Auckland, 1025, New Zealand; University of Auckland, Park Road, Auckland, 1010, New Zealand
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Bui S, Facchin A, Ha P, Bouchet S, Leroux S, Nacka F, Fayon M, Jacqz-Aigrain E. Population pharmacokinetics of ceftazidime in critically ill children: impact of cystic fibrosis. J Antimicrob Chemother 2020; 75:2232-2239. [PMID: 32457995 DOI: 10.1093/jac/dkaa170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 03/30/2020] [Accepted: 04/02/2020] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Pharmacokinetics data on ceftazidime are sparse for the paediatric population, particularly for children with cystic fibrosis (CF) or severe infections. OBJECTIVES To characterize the population pharmacokinetics of ceftazidime in critically ill children, identify covariates that affect drug disposition and evaluate the current dosing regimens. METHODS The study was registered with Clinicaltrials.gov (NCT01344512). Children receiving ceftazidime were selected in 13 French hospitals. Plasma concentrations were determined by UPLC-MS/MS. Population pharmacokinetic analyses were performed using NONMEN software. RESULTS One hundred and eight patients, aged 28 days to 12 years, with CF (n = 32), haematology and/or oncology disorders (n = 47) or severe infection (n = 29) were included. Ceftazidime was administered by continuous or intermittent infusions; 271 samples were available for analysis. A two-compartment model with first-order elimination and allometric scaling was developed and covariate analysis showed that ceftazidime pharmacokinetics were also significantly affected by CLCR and CF. Ceftazidime clearance was 82% higher in CF than in non-CF patients. Monte Carlo simulations showed that the percentage of target attainment (PTA) for the target of T>MIC = 65% was (i) lower in CF than in non-CF children with intermittent infusions and (ii) higher with continuous than intermittent infusion in all children. CONCLUSIONS The population pharmacokinetics model for ceftazidime in children was influenced by body weight, CLCR and CF. A higher PTA was obtained with continuous versus intermittent infusions. Further studies should explore the benefits of continuous versus intermittent infusion of ceftazidime, including current versus increased doses in CF children.
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Affiliation(s)
- S Bui
- Centre d'Investigation Clinique (CIC1401), Centre de Ressources et de Compétences de la Mucoviscidose (CRCM), Centre de Recherche Cardio-thoracique de Bordeaux (U1045), Université de Bordeaux, Centre Hospitalier Universitaire de Bordeaux Groupe hospitalier Pellegrin, Bordeaux, France
| | - A Facchin
- Département de Pharmacologie Pédiatrique et Pharmacogénétique, Centre Hospitalier Universitaire Robert Debré APHP, Paris, France.,Service de Pharmacie, Centre hospitalier Intercommunal Robert Ballanger, Aulnay-sous-Bois, France.,Université de Paris, Paris, France
| | - P Ha
- Département de Pharmacologie Pédiatrique et Pharmacogénétique, Centre Hospitalier Universitaire Robert Debré APHP, Paris, France
| | - S Bouchet
- Département de Pharmacologie et de toxicologie, Centre Hospitalier Universitaire de Bordeaux, Groupe hospitalier Pellegrin, Bordeaux, France
| | - S Leroux
- Département de Pharmacologie Pédiatrique et Pharmacogénétique, Centre Hospitalier Universitaire Robert Debré APHP, Paris, France
| | - F Nacka
- Centre d'Investigation Clinique (CIC1401), Centre de Ressources et de Compétences de la Mucoviscidose (CRCM), Centre de Recherche Cardio-thoracique de Bordeaux (U1045), Université de Bordeaux, Centre Hospitalier Universitaire de Bordeaux Groupe hospitalier Pellegrin, Bordeaux, France
| | - M Fayon
- Centre d'Investigation Clinique (CIC1401), Centre de Ressources et de Compétences de la Mucoviscidose (CRCM), Centre de Recherche Cardio-thoracique de Bordeaux (U1045), Université de Bordeaux, Centre Hospitalier Universitaire de Bordeaux Groupe hospitalier Pellegrin, Bordeaux, France
| | - E Jacqz-Aigrain
- Département de Pharmacologie Pédiatrique et Pharmacogénétique, Centre Hospitalier Universitaire Robert Debré APHP, Paris, France.,Université de Paris, Paris, France.,Centre d'Investigation Clinique (CIC1426), Centre Hospitalier Universitaire Robert Debré APHP, Paris, France
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Windon M, D'Souza G, Waterboer T, Rooper L, Westra W, Troy T, Pardoll D, Tan M, Yavvari S, Kiess A, Miles B, Mydlarz W, Ha P, Bender N, Eisele D, Fakhry C. Risk Factors for Human Papillomavirus-Positive Nonoropharyngeal Squamous Cell Carcinoma. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2019.11.176] [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: 10/24/2022]
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Kiess A, Bishop J, Kang H, Rowe S, Shen C, Brummet M, Eisele D, Rodriguez MB, Ha P, Pomper M. Clinical PET/CT Imaging and Histopathology Demonstrate Expression of Prostate-Specific Membrane Antigen in Salivary Gland Adenoid Cystic Carcinomas. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2017.12.191] [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: 10/17/2022]
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Xu M, Garsa A, Lazar A, Arron S, Ryan W, El-Sayed I, George J, Algazi A, Heaton C, Ha P, Yom S. Prognostic Factors for Recurrence and Survival Independent of the Revised AJCC 8th Edition Staging System in Patients with Cutaneous Squamous Cell Carcinoma Treated with Multimodality Therapy. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1519] [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: 11/29/2022]
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Ha P, Li C, Shi B. Parent satisfaction with primary repair of paediatric cleft lip in Southwest China. Int J Oral Maxillofac Surg 2016; 46:281-285. [PMID: 27769737 DOI: 10.1016/j.ijom.2016.09.024] [Citation(s) in RCA: 3] [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] [Received: 02/26/2016] [Revised: 07/17/2016] [Accepted: 09/28/2016] [Indexed: 10/20/2022]
Abstract
The purpose of this study was to investigate the key factors in relation to parent satisfaction with the primary repair of paediatric cleft lip. One hundred and ninety-five children born with cleft lip and/or palate aged between 3 months and 1 year were recruited, along with their caregivers. All patients underwent primary cleft lip repair, and a telephone interview was held with their main caregivers at 3 months postoperative. The level of satisfaction with each item included in a simplified Cleft Evaluation Profile was ascertained and recorded. Patient clinical data were obtained from the medical records. One hundred and thirty-eight (71%) parents reported satisfaction with the general outcome of surgery. Parents were satisfied with the appearance of the lip and profile of the face, but were dissatisfied with the appearance of the nose and teeth. Mothers of patients showed lower satisfaction levels than fathers and grandparents. Parental satisfaction with the appearance of the lip was lower for patients without a cleft palate than for those with a cleft palate. The results of this study suggest that most Chinese parents of children who undergo primary cleft lip repair express satisfaction with the surgical outcomes. Satisfaction with the appearance of the nose and teeth is low and this needs to be improved. Other factors are likely to influence expressions of satisfaction.
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Affiliation(s)
- P Ha
- Department of Cleft Lip and Palate Surgery, West China Stomatology Hospital, Sichuan University, Chengdu, PR China
| | - C Li
- Department of Cleft Lip and Palate Surgery, West China Stomatology Hospital, Sichuan University, Chengdu, PR China; State Key Laboratory of Oral Disease, West China Stomatology School, Sichuan University, Chengdu, PR China
| | - B Shi
- Department of Cleft Lip and Palate Surgery, West China Stomatology Hospital, Sichuan University, Chengdu, PR China; State Key Laboratory of Oral Disease, West China Stomatology School, Sichuan University, Chengdu, PR China.
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Tanzil AH, Sultana ST, Saunders SR, Dohnalkova AC, Shi L, Davenport E, Ha P, Beyenal H. Production of gold nanoparticles by electrode-respiring Geobacter sulfurreducens biofilms. Enzyme Microb Technol 2016; 95:69-75. [PMID: 27866628 DOI: 10.1016/j.enzmictec.2016.07.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 07/19/2016] [Accepted: 07/21/2016] [Indexed: 12/23/2022]
Abstract
The goal of this work was to synthesize gold nanoparticles (AuNPs) using electrode-respiring Geobacter sulfurreducens biofilms. We found that AuNPs are generated in the extracellular matrix of Geobacter biofilms and have an average particle size of 20nm. The formation of AuNPs was verified using TEM, FTIR and EDX. We also found that the extracellular substances extracted from electrode-respiring G. sulfurreducens biofilms reduce Au3+ to AuNPs. From FTIR spectra, it appears that reduced sugars were involved in the bioreduction and synthesis of AuNPs and that amine groups acted as the major biomolecules involved in binding.
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Affiliation(s)
- Abid H Tanzil
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA
| | - Sujala T Sultana
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA
| | - Steven R Saunders
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA
| | - Alice C Dohnalkova
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Liang Shi
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, USA
| | - Emily Davenport
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA
| | - Phuc Ha
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA
| | - Haluk Beyenal
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA.
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8
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Ha P, Shi B, Zheng Q. Self-concept of Chinese children and adolescents with cleft lip and/or palate. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.111] [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: 10/22/2022]
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Fakhry C, Agrawal N, Califano J, Coquia S, Hamper U, Saunders J, Messing B, Ha P, Gillison M, Blanco R. Ultrasound in the Search for the Primary Site of Unknown Primary Head-and-Neck Squamous Cell Cancers. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2013.11.115] [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: 11/25/2022]
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Wong AK, Shanahan F, Chen Y, Lian L, Ha P, Hendricks K, Ghaffari S, Iliev D, Penn B, Woodland AM, Smith R, Salada G, Carillo A, Laity K, Gupte J, Swedlund B, Tavtigian SV, Teng DH, Lees E. BRG1, a component of the SWI-SNF complex, is mutated in multiple human tumor cell lines. Cancer Res 2000; 60:6171-7. [PMID: 11085541] [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: 02/18/2023]
Abstract
Human BRG1 is a component of the evolutionarily conserved SWI-SNF chromatin remodeling complex. BRG1 has been implicated in growth control through its interaction with the tumor suppressor pRb and may consequently serve as a negative regulator of proliferation. Postulating that BRG1 may itself be a tumor suppressor gene, we screened a panel of tumor cell lines to determine whether the gene is targeted for mutation. We report that the COOH-terminal region of BRG1 is homozygously deleted in two carcinoma cell lines, prostate TSU-Pr1 and lung A-427. In addition, biallelic inactivations of BRG1 were observed in four other cell lines derived from carcinomas of the breast, lung, pancreas, and prostate; their mutations in BRG1 included three frameshift lesions and one nonsense lesion. Point mutations were also discovered in a number of other cell lines, however in most cases any effect of these mutations on BRG1 function remains to be established. A variety of different mutations within BRG1, in several cell lines, suggest that BRG1 may be targeted for disruption in human tumors. Significantly, reintroduction of BRG1 into cells lacking BRG1 expression was sufficient to reverse their transformed phenotype inducing growth arrest and a flattened morphology. These data strongly support the model that BRG1 may function as a tumor suppressor and strengthen the hypothesis that the regulation of gene expression through chromatin remodeling is critical for cancer progression. It will be important to confirm these observations in primary tumors.
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Affiliation(s)
- A K Wong
- Myriad Genetics, Inc., Salt Lake City, Utah 84108, USA
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Xia Y, Ha P, Hill K, Butler J, Whanger P. Distribution of selenium between fractions in erythrocytes, plasma, hair, and fingernails of Chinese women living in selenium-deficient, -adequate, and -excessive areas of China. ACTA ACUST UNITED AC 2000. [DOI: 10.1002/1520-670x(2000)13:4<333::aid-jtra2>3.0.co;2-p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Finley JW, Duffield A, Ha P, Vanderpool RA, Thomson CD. Selenium supplementation affects the retention of stable isotopes of selenium in human subjects consuming diets low in selenium. Br J Nutr 1999; 82:357-60. [PMID: 10673907 DOI: 10.1017/s0007114599001592] [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] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Twenty-nine women and fifteen men from an area of low Se intake (South Island of New Zealand) consumed 100 micrograms stable 74Se, as selenate given in water after an overnight fast, and blood was collected for 3 weeks. They were then divided into five groups and supplemented with 0, 10, 20, 30 and 40 micrograms Se/d (as selenomethionine) for 5 months. After 5 months, they received a second dose of 74Se identical to the first. Supplementation significantly altered retention of 74Se in the plasma, but not in the erythrocytes or platelets. Subjects receiving the placebo retained the greatest amount, and subjects receiving 30 micrograms supplemental Se/d retained the least 74Se. Supplementation resulted in relatively more isotope being retained in a medium molecular mass protein considered to be albumin, and relatively less in another fraction considered to be selenoprotein P. The lack of many observed changes in retention of stable Se, and the shift in retention among the plasma proteins, suggests that supplemental Se was not being used to replete critical pools of Se, probably because of adaptation to low Se intake.
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Affiliation(s)
- J W Finley
- Department of Agriculture, Grand Forks Human Nutrition Research Center, ND 58202, USA.
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Abstract
OBJECTIVE This study was undertaken to investigate the metabolism of selenite in men with life-long intakes of deficient, adequate and excess selenium. METHODS Stable isotopes of selenium were infused for five hours into Chinese men living in deficient, adequate or excessive selenium areas, and 24-hour urine and blood samples were collected daily for the next seven days. Stable isotopic selenium excretion was determined in urine and in whole plasma and plasma fractions. RESULTS Even though there was a positive correlation of selenium intake with the urinary excretion of this element, this relationship was not linear over the entire range (deficient, adequate, excessive) of selenium intake. When the urine excretion was normalized internally within each group, a sharp increase in the slope of this relationship was found when long-term intake increased to adequate amounts, but the slope reached a plateau when the daily intake exceeded the adequate group. The plasma selenoprotein P fraction was labeled initially, but the incorporation in the glutathione peroxidase fraction subsequently increased by a small amount. A two-month dietary restriction of selenium of the subjects from the excess area did not result in a reduction of urinary excretion of infused selenite. CONCLUSION A complex relationship exists between long-term intake of selenium and selenium status, and subjects living in the excess area are more saturated with selenium than anticipated. More than two months of depletion are required to affect urinary excretion of selenium.
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Affiliation(s)
- M Janghorbani
- BioChemAnalysis Corp and the Center for Stable Isotope research Inc, Chicago, Illinois, USA
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Janghorbani M, Xia Y, Ha P, Whanger PD, Butler JA, Olesik JW, Grunwald E. Effect of dietary selenium restriction on selected parameters of selenium status in men with high life-long intake11Published with the approval of the Oregon State University Agricultural Experiment Station as Technical Paper number 11,383. J Nutr Biochem 1999; 10:564-72. [PMID: 15539252 DOI: 10.1016/s0955-2863(99)00039-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/1999] [Accepted: 06/07/1999] [Indexed: 11/21/2022]
Abstract
The influence of selenium (Se) restriction on disposition in plasma and urine fractions of infused (74)Se (selenite) was studied when adult males (Enshi City, Hubei Province, PRC) whose habitual daily Se intake is approximately 480 microg per day were transferred to Lichuan County, where the daily intake is approximately 30 microg. The subjects received an infusion (106 microg Se) on the day before consuming foods low in Se and a second infusion (113 microg Se) 63 days later. Blood and 24-hour urine samples were collected each day for 7 days after the first infusion and on days 22, 43, and 62 following the first infusion. Urine and blood were also collected daily for the next 7 days after the second infusion. Plasma total Se concentration increased for 7 days after each of the two infusions and urine Se decreased exponentially following both the first and second infusions. The excretion of trimethylselenonium followed the same pattern as the total urinary Se. Surprisingly, there was not a significant difference in selenite retention between the two infusion periods, and the data indicated that, regardless of the chemical form of Se present in various organs, its catabolism leading to excretion in urine followed the same pathway as that of selenite. Labeled Se was incorporated predominantly in the plasma selenoprotein P fraction and the half-life of Se in this fraction was determined to be 1.9 to 2.9 days. Thus, a longer depletion period is required in these subjects to obtain more significant changes.
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Affiliation(s)
- M Janghorbani
- BioChemAnalysis Corp. and the Center for Stable Isotope Research Inc., Chicago, IL, USA
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15
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Janghorbani M, Xia Y, Ha P, Whanger PD, Butler JA, Olesik JW, Daniels L. Quantitative significance of measuring trimethylselenonium in urine for assessing chronically high intakes of selenium in human subjects. Br J Nutr 1999; 82:291-7. [PMID: 10655978] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
The purpose of the present study was to investigate the effects of Se restriction on the excretion of Se in men who had consumed high levels of this element during their entire lives. With the use of stable isotopes of Se as selenite, the excretion of methylated Se in urine was investigated in Chinese men (n 10) who had habitual chronic high intakes of this element. The relationship between either urine Se or trimethylselenonium (TMSe) to the estimated long-term Se intake was not linear over the entire range of intake, which was also true for the infusion of labelled selenite. A non-linear relationship was also found between urine TMSe and urine Se both for TMSe arising from catabolism of endogenous body Se and that from infused selenite. The data suggest a close precursor-product relationship of urine Se and its TMSe component based on the nearly identical specific activities for these two selenocompounds. Although dimethylselenide in breath was not measured in the present study, combining urinary TMSe with this breath test may be more useful in the assessment of long-term Se status.
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Affiliation(s)
- M Janghorbani
- BioChemAnalysis Corp. and the Center for Stable Isotope Research Inc., Chicago, IL, USA
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Wong AK, Ormonde PA, Pero R, Chen Y, Lian L, Salada G, Berry S, Lawrence Q, Dayananth P, Ha P, Tavtigian SV, Teng DH, Bartel PL. Characterization of a carboxy-terminal BRCA1 interacting protein. Oncogene 1998; 17:2279-85. [PMID: 9811458 DOI: 10.1038/sj.onc.1202150] [Citation(s) in RCA: 125] [Impact Index Per Article: 4.8] [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: 11/08/2022]
Abstract
There are several lines of evidence indicating that the carboxy-terminal region of the tumor suppressor protein BRCA1 is a functionally significant domain. Using the yeast two-hybrid and in vitro biochemical assays, we show that a protein, CtIP, interacts specifically with the carboxy-terminal segment of human BRCA1 from residues 1602-1863. A germ line truncation mutation, Y1853ter, that removes the last 11 amino acids from the carboxy-terminus of BRCA1, abolishes not only its transcriptional activation function, but also binding to CtIP. The function of CtIP is unknown, but its reported association with a transcriptional repressor CtBP lends further support that it may have a role in transcription. A sequence based screen of a panel of 89 tumor cell line cDNAs for mutations in the CtIP coding region identified five missense variants. In the pancreatic carcinoma cell line, BxPC3, the non-conservative lysine to glutamic acid change at codon 337 is accompanied with apparent loss of heterozygosity or non-expression of the wild type allele. Thus it is plausible that CtIP may itself be a tumor suppressor acting in the same pathway as BRCA1.
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Affiliation(s)
- A K Wong
- Myriad Genetics, Inc., Salt Lake City, Utah 84108, USA
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Yang X, Tian Y, Ha P, Gu L. [Determination of the selenomethionine content in grain and human blood]. Wei Sheng Yan Jiu 1997; 26:113-6. [PMID: 10325615] [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: 02/12/2023]
Abstract
The authors used the method of cyanogen bromide-fulorimetry to determine the trace amounts of bound selenomethionine (SeMet) in corn, rice, wheat, soybean and human blood. The contents of SeMet in corn samples were found to be 9.2-19014.1 ng/g, and 45.5% to 82% of the total Se in corn samples were in the form of SeMet. Like corn, the proportion of Se in the form of SeMet in total Se in rice, wheat and soybean were 54.9%-86.5%, 50.4%-81.4% and 62.9%-71.8% respectively. The results showed that SeMet is the major chemical form of Se in grain samples determined. The contents of SeMet in two human blood samples (Se content 56.4 ng/g and 71.8 ng/g) were determined as 28.3 ng/g and 53.4 ng/g respectively.
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Affiliation(s)
- X Yang
- Institute of Nutrition & Food Hygiene, Chinese Academy of Preventive Medicine, Beijing, China
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Yang X, Zhou R, Ha P, Tian Y, Gu LZ, Xia YM. [Method of cyanogen bromide-fluorimetry determination of trace amount of selenomethionine in grain and blood]. Wei Sheng Yan Jiu 1997; 26:56-9. [PMID: 15747464] [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: 05/02/2023]
Abstract
Selenomethionine (SeMet) reacted with cyanogen bromide (BrCN) quantitatively forms CH3SeCN. After extracted with CHCl3, the Se of CH3SeCN is acid-digested to Se(IV). Then 2,3-diaminonaphthalene is used to determine the fluorescent Se value of 4,5-benzopiaselenol. The determination limit of this method was 3 ng/g SeMet. The accuracy of 10-500 ng Se in SeMet standard was 91.8%-97.6%. RSD was 1.9%-6.3%. Recoveries for grain and blood were 92.3%-96.7%. RSD was 2.7%-5.1%. The RSD for samples was 2.7%-9.0%. Selenocystine, selenocystiene selenite and methionine did not interfere with the determination.
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Affiliation(s)
- X Yang
- Institute of Nutrition & Food Hygiene, CAPM, Beijing 100050, China
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