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Alteration in antioxidant status in slow and fast alleles of EPHX1 gene polymorphisms among wood workers

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Abstract

Occupational wood dust exposure may be associated with various health effects, especially in wood industry. These effects may be due to inducing oxidative stress which is related to inflammations. Biochemical assessment of antioxidant enzyme activities illustrated role of oxidative stress (OS) on its depletion. Super oxide dismutase, glutathione peroxidase (GPx) and catalase (CAT) were analyzed in 50 exposed workers and 50 control subjects. Also, macrophage inflammatory protein-2 was assessed among these workers as it was produced upon dust exposure. Microsomal epoxide hydrolase (EPHX1) enzyme shared in the protective mechanism against wood dust oxidative stress. It plays a dual role in the metabolism of environmental pollutants, detoxification, and bioactivation. Gene polymorphisms of EPHX1 may be associated with variations in enzyme activity. Polymorphisms in exons 3 and 4 have resulted in either decreased (slow conjugating allele) or increased (fast conjugating allele) activity in vitro. We aimed to evaluate the associations between EPHX1 polymorphisms and change in antioxidant status (SOD, CAT, and GPx) among wood dust exposed workers. EPHX1 genotyping in exon 3 and exon 4 polymorphisms was carried out by PCR-RFLP. Our result shows a significant reduction in enzymatic antioxidants (SOD, CAT, and GPx) levels with significant rise in MIP-2 levels in worker group. Also, there are significant variations in SOD, CAT, and GPx levels as well as in MIP-2 in different genotypes of EPHX polymorphisms in exon 3 or 4 (specially in Hist-Hist genotypes in both exons). We can conclude an alteration in antioxidant status in both slow and fast allele of EPHX gene polymorphisms with release of MIP-2 protein in wood workers.

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Data sharing not applicable to this article as no datasets were generated or analyzed during the current study.

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Acknowledgment

The authors express their sincere thanks to Prof Dr Amal Saad, Prof. of Environmental & Preventive Medicine, National Research Centre, for her encouragement during the study and her help in analyzing the data.

Funding

The study was funded by the National Research Centre. The grant number is (11205).

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Authors

Contributions

MMT designed the study and performed genetic analysis, EMS conducted the biochemical study. HMA interviewed the participants and performed clinical examination. MMT analyzed and interpreted the data and wrote the manuscript. All authors have critically reviewed and approved the final draft and are responsible for the content and similarity index of the manuscript.

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Correspondence to Mona M. Taha.

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Consents were obtained from all subjects before onset of work. Approval of the Ethical committee of the National Research Centre was taken prior to the study (Registration number 11075).

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The paper has not been published before and is not considered for publication elsewhere. The corresponding Author took the consent of all Co-authors before sending the paper for publication.

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The authors declared no potential conflicts of interest.

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Taha, M.M., Shahy, E.M. & Mahdy-abdallah, H. Alteration in antioxidant status in slow and fast alleles of EPHX1 gene polymorphisms among wood workers. Environ Sci Pollut Res 28, 49678–49684 (2021). https://doi.org/10.1007/s11356-021-14166-0

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