Distributions and ranges of values of blood and urinary biomarker of inflammation and oxidative stress in the workers engaged in office machine manufactures: evaluation of reference values
-
Tadashi Murase
, Hiroko Kitamura
, Takeshi Kochi , Niina Terunuma , Shizuka Kurosaki , Kouichi Hata , Nobuaki Yanagi , Bungo Uchino , Kayo Kitahara , Yasuo Morimoto , Hiroshi Kasai , Toshio Sasaki , Akira Ogami and Toshiaki Higashi
Abstract
Background: Interleukins, interferons and oxidative DNA products are important biomarkers assessing the inflammations and tissue damages caused by toxic materials in the body. We tried to evaluate distributions, reference values and age related changes of blood levels of inflammatory cytokines, C-reactive protein (CRP), IgE and urine levels of 8-hydroxy-2′-deoxyguanosine (8-OHdG) among workers in a cohort study evaluating the health influences of toner particles.
Methods: A total of 1366 male workers under age 50 years (age 19–49 years; 718 exposed and 648 not exposed to toner particles) in a cross sectional study of 1614 (categorized as 809 exposed and 805 not exposed, age 19–59 years) workers in a photocopier company has been followed prospectively as the cohort. Blood levels of interleukin (IL)-4, IL-6, IL-8, interferon-γ (IFN-γ), CRP, IgE and urine 8-OHdG were measured annually for 5 years.
Results: Reference values of the biomarkers are; CRP: 0.01–0.63×10-2 g/L, IgE: 6–1480 IU/mL, IL-4: 2.6–76.1 pg/mL, IL-6: 0.4–4.9 pg/mL and 8-OHdG: 1.5–8.2 ng/mgCr. We could not evaluate reference values for IL-8 and IFN-γ because most of the values were below the sensitivity limits (2.0 pg/mL and 0.1 IU/mL, respectively). There were no differences of the biomarker levels between the toner exposed and the control workers. We observed a statistically significant age related decrease of serum IL-4 levels.
Conclusions: This is the first report assessing the distributions and reference values of inflammatory biomarker levels in a large scaled cohort. We observed age related changes of some of the biomarkers. We could not detect any differences of the studied biomarker values between the toner exposed and the control workers.
The cost of the study was provided to the University of Occupational and Environmental Health, Japan (UOEH) by Fuji Xerox Co., Ltd. as expenses for contract research. This article is based on a presentation at the 8th International Symposium on Biological Monitoring in Occupational and Environmental Health (ISBM 2010), 6–8 September 2010.
Conflict of interest statement
Authors’ conflict of interest disclosure: The authors stated that there are no conflicts of interest regarding the publication of this article. Research funding played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
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- An unusual interference in CK MB assay caused by a macro enzyme creatine phosphokinase (CK) type 2 in HIV-infected patients
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