Abstract
Cytochrome P4502E1 (CYP2E1), glutathione-S-transferase A4-4 (GSTA4-4), and inducible nitric oxide synthase (iNOS) are implicated in maneb- and paraquat-induced toxicity leading to various pathological conditions. The study aimed to investigate the role of CYP2E1 in maneb- and paraquat-induced oxidative stress in rat polymorphonuclear leukocytes (PMNs) and its crosstalk with iNOS-mediated nitrosative stress and GSTA4-4-linked protective effect, if any and their consequent links with the nuclear factor erythoid 2-related factor 2 (Nrf2) activation and heme oxygenase-1 (HO-1) expression. Rats were treated with/without maneb and/or paraquat for 1, 2, and 3 weeks along with vehicle controls. Subsets of rats were also treated with diallyl sulfide (DAS) or aminoguanidine (AG) along with the respective controls. Maneb and paraquat augmented the reactive oxygen species (ROS), lipid peroxidation (LPO) and 4-hydroxy nonenal (4-HNE) contents, and superoxide dismutase (SOD) activity in the PMNs. However, maneb and paraquat attenuated the reduced glutathione (GSH) level and the expression/activity of total GST and GST-pi. Maneb and paraquat increased the expression/activity of CYP2E1, GSTA4-4, iNOS, Nrf2 and HO-1, and nitrite content. CYP2E1 inhibitor, DAS noticeably alleviated maneb- and paraquat-induced ROS, LPO, 4-HNE, SOD, Nrf2 and HO-1, GST, GSH, and GST-pi while iNOS, nitrite content and GSTA4-4 levels were unchanged. Conversely, AG, an iNOS inhibitor, attenuated maneb- and paraquat-directed changes in nitrite, LPO, iNOS but it did not alter ROS, GSH, SOD, GST, GST-pi, Nrf2, HO-1, CYP2E1, and GSTA4-4. The results demonstrate that CYP2E1 induces iNOS-independent free radical generation and subsequently modulates the Nrf2-dependent HO-1 and 4-HNE-mediated GST expression in maneb- and paraquat-treated PMNs.
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19 July 2019
In the original publication of the article, the wrong ��-actin blots were pasted in Figs. 1b and 2c. The correct versions of Figs. 1b and 2c are given in this correction.
19 July 2019
In the original publication of the article, the wrong ��-actin blots were pasted in Figs. 1b and 2c. The correct versions of Figs. 1b and 2c are given in this correction.
19 July 2019
In the original publication of the article, the wrong ��-actin blots were pasted in Figs. 1b and 2c. The correct versions of Figs. 1b and 2c are given in this correction.
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Acknowledgments
Authors acknowledge the Indian Council of Medical Research (ICMR), New Delhi, India for the financial support of a part of the study. Authors sincerely thank the CSIR, New Delhi, India for providing research fellowships to Israr Ahmad and Amit Kumar Chauhan; ICMR, New Delhi, India to Smriti Shukla; University Grants Commission (UGC), New Delhi, India to Brajesh Kumar Singh and Deepali Singh and Department of Biotechnology, New Delhi, India to Vinod Kumar. The IITR communication number of this article is 3131.
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Ahmad, I., Shukla, S., Singh, D. et al. CYP2E1-mediated oxidative stress regulates HO-1 and GST expression in maneb- and paraquat-treated rat polymorphonuclear leukocytes. Mol Cell Biochem 393, 209–222 (2014). https://doi.org/10.1007/s11010-014-2062-y
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DOI: https://doi.org/10.1007/s11010-014-2062-y