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Effect of methionine feeding on oxidative stress, intracellular calcium and contractility in cardiomyocytes isolated from male and female rats

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Abstract

Homocysteine (Hcy) is a breakdown product of methionine metabolism. The risk of cardiovascular disease (CVD) correlates with an increase in plasma Hcy levels. The aim of this study was to investigate whether 1% methionine supplementation of adult rats altered intracellular reactive oxygen species (ROS) generation, intracellular Ca2+ content, and contractile activity in freshly isolated cardiomyocytes. This was measured under normal conditions and during oxidative stress in freshly isolated cardiomyocytes. Single rat cardiomyocytes from both sexes were isolated by enzymatic and mechanical dispersion techniques. Fluorescence microscopy was used to measure ROS production and intracellular Ca2+ concentration. Cell contraction was measured using a video camera. During exposure to 200 μM, H2O2 female cardiomyocytes produced significantly fewer ROS and had a higher intracellular Ca2+ concentration compared to male cardiomyocytes in control and methionine-fed conditions. The contractility of cardiomyocytes isolated from male rats was insignificantly decreased after methionine feeding compared to control, while the contractility of cardiomyocytes from female rats insignificantly reduced after methionine feeding and acute exposure to oxidative stress. These findings provide evidence that during exposure to 200 μM H2O2, cardiomyocytes from female rats produce less ROS and have higher intracellular Ca2+ levels. There were no significant effects on contractility in cardiomyocytes from either gender and under any of the different conditions.

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Acknowledgements

We would like to thank the technical staff for their excellent assistance.

Funding

This work was supported by Iraqi Ministry of Higher Education and University of New England.

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Authors and Affiliations

  1. School of Science and Technology, University of New England, Armidale, NSW, 2351, Australia

    Shatha A. Demerchi, James R. McFarlane & Pierre D.J. Moens

  2. Technical College/Kirkuk, Northern Technical University, Kirkuk, Iraq

    Shatha A. Demerchi

  3. School of Biomedical Sciences, Faculty of Health, University of Plymouth, Plymouth, PL4 8AA, UK

    Nicola King

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  1. Shatha A. Demerchi
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  2. Nicola King
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  3. James R. McFarlane
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  4. Pierre D.J. Moens
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Correspondence to Nicola King.

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Demerchi, S.A., King, N., McFarlane, J.R. et al. Effect of methionine feeding on oxidative stress, intracellular calcium and contractility in cardiomyocytes isolated from male and female rats. Mol Cell Biochem 476, 2039–2045 (2021). https://doi.org/10.1007/s11010-020-04011-2

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  • DOI: https://doi.org/10.1007/s11010-020-04011-2

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