Abstract:
:Cytokines are key mediators in cell regulation and communication. The concentration of these proteins can rapidly and importantly increase during severe clinical situations. However, current techniques are not adapted to stat measurement, thus making their clinical use limited. In this context, the commercialization of five new kits for cytokine measurement interleukin ((IL)-1, IL-6, IL-8, tumor necrosis factor (TNF)-alpha and IL-2R) on an automated immunoanalyzer, the Immulite, seems to be a new approach for the determination of these markers. We report here the evaluation of the performance of these tests. The technique is based on a solid phase (bead) two site chemiluminescent enzyme immunometric assay. The analysis is performed within 60 to 90 minutes and the calibration is stable for 15 days. The values of the between-run imprecision study were similar to those from the within-run study with coefficients of variation (CV) ranging from 2% (low values of IL-8) to 11.5% for intermediate concentrations of IL-6 (500 pg/ml). CVs were usually around 5%. The accuracy was determined by a linearity study using standards (except for IL-2R) provided by the National Institute for Biological Standards and Control (NIBSC). Slopes obtained during this study were close to 1 (r2 = 0.99), except for IL-6, for which the slope was 1.55. TNF-alpha values were close to those expected. IL-1 results were about 20% higher. IL-6 values were over estimated above 100 pg/ml and under estimated below this value. IL-8 study seemed to be impaired by the poor stability of this molecule in the NIBSC preparation. Correlation study with standard laboratory techniques gave variable results: for IL-1 (n = 43) the slope was 0.77 (study carried out using cell culture media), for IL-6 (n = 54) the slope was 0.78, for IL-8 (n = 37) the slope was 1.64, for TNF-alpha (n = 40) the slope was 0.33 and the slope for IL-2R (n = 51) was 5.1. For the last cytokine, the unit in Immulite assay was different from the one used in our comparison technique. Cross-calibration results were consistent with these data and show that the bias is probably linked to a calibration problem. The study demonstrated excellent practicality of the system, and good stability of the calibration curve (15 days). However, the sample volume required (350 microl for the IL-6 and the TNF-alpha) could constitute a limitation for pediatric measurements.
journal_name
Clin Chem Lab Medjournal_title
Clinical chemistry and laboratory medicineauthors
Berthier F,Lambert C,Genin C,Bienvenu Jdoi
10.1515/CCLM.1999.092keywords:
subject
Has Abstractpub_date
1999-05-01 00:00:00pages
593-9issue
5eissn
1434-6621issn
1437-4331journal_volume
37pub_type
杂志文章abstract:BACKGROUND:Polymorphisms of the gene for C-reactive protein (CRP) alter baseline serum CRP concentrations. The impact of polymorphisms of the CRP gene (genotype) on the normal range for CRP concentrations (phenotype) has not been determined. This study evaluated the median serum CRP concentrations in normal subjects st...
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pub_type: 杂志文章
doi:10.1515/CCLM.2009.005
更新日期:2009-01-01 00:00:00
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pub_type: 杂志文章,评审
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pub_type: 杂志文章,评审
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doi:10.1515/CCLM.2010.024
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pub_type: 杂志文章,meta分析
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pub_type: 杂志文章
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更新日期:2002-04-01 00:00:00
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doi:10.1515/CCLM.2004.010
更新日期:2004-01-01 00:00:00
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journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2003.050
更新日期:2003-03-01 00:00:00
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journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/cclm-2018-1211
更新日期:2019-04-24 00:00:00
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journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2004.146
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pub_type: 杂志文章
doi:10.1515/cclm-2017-0356
更新日期:2017-11-27 00:00:00
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journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.1999.076
更新日期:1999-04-01 00:00:00
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pub_type: 杂志文章,多中心研究
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更新日期:2014-10-01 00:00:00
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journal_title:Clinical chemistry and laboratory medicine
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更新日期:2016-04-01 00:00:00
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journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.1998.077
更新日期:1998-06-01 00:00:00
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journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2006.183
更新日期:2006-01-01 00:00:00
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pub_type: 杂志文章
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journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2002.081
更新日期:2002-05-01 00:00:00
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journal_title:Clinical chemistry and laboratory medicine
pub_type: 杂志文章
doi:10.1515/CCLM.2000.168
更新日期:2000-11-01 00:00:00
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