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Differential expression of HO-1 and CYP1A2 during up-regulation of ERK in stressed fish hepatocytes

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Abstract

Induction of heme oxygenase-1 (HO-1) and extracellular signal-regulated kinase (ERK) is a crucial step in the cellular response to oxidative stress. Altered expression of such proteins in response to stress conditions is a key factor for the maintenance of cellular integrity and survival. Hypoxia-inducible factor-1 (HIF-1) and cytochrome P450 1A (CYP1A) are critical indicators of environmental exposure to hypoxia. The current study was aimed to analyse the expression pattern of HO-1, p-ERK, HIF-1α and CYP1A2 in hepatocytes of Mugil cephalus inhabiting Kovalam (unpolluted site) and Ennore (polluted site) estuaries. The impact of stress on hepatocytes was assessed by measuring the level of lipid hydroperoxides (LHP) and reduced glutathione (GSH) in hepatocytes of M. cephalus inhabiting these estuaries. The expression of HO-1, p-ERK, HIF-1α and CYP1A2 was analysed by ELISA and immunoblot analysis, respectively. There was significant decrease of GSH (19 %) and CYP1A2 (34 %) along with significant increase of LHP (31 %), HO-1 (96 %), p-ERK (p < 0.01) and HIF-1α (41 %) in hepatocytes of M. cephalus inhabiting Ennore estuary than Kovalam estuary. The present study shows that increased synthesis of HO-1 mainly regulated by p-ERK and HIF-1α may significantly contribute to the environmental adaptation processes of grey mullet, by protecting the cells from oxidative stress and stress-induced degenerative changes.

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Acknowledgments

The project was funded by University Grants Commission, New Delhi, India. Project referral number-UGC: 41-1281/2012 (SR) is acknowledged.

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The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

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Padmini, E., Tharani, J. Differential expression of HO-1 and CYP1A2 during up-regulation of ERK in stressed fish hepatocytes. Environ Monit Assess 187, 4147 (2015). https://doi.org/10.1007/s10661-014-4147-1

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