Author(s) |
Demerchi, Shatha A
King, Nicola
McFarlane, James Robert
Moens, Pierre
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Publication Date |
2021-01-30
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Abstract |
<p>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 Ca<sup>2+</sup> 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 Ca<sup>2+</sup> concentration. Cell contraction was measured using a video camera. During exposure to 200 μM, H<sub>2</sub>O<sub>2</sub> female cardiomyocytes produced significantly fewer ROS and had a higher intracellular Ca<sup>2+</sup> 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 H<sub>2</sub>O<sub>2</sub>, cardiomyocytes from female rats produce less ROS and have higher intracellular Ca<sup>2+</sup> levels. There were no significant effects on contractility in cardiomyocytes from either gender and under any of the different conditions.</p>
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Citation |
Molecular and Cellular Biochemistry, v.476, p. 2039-2045
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ISSN |
1573-4919
0300-8177
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Link | |
Publisher |
Springer New York LLC
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Title |
Effect of methionine feeding on oxidative stress, intracellular calcium and contractility in cardiomyocytes isolated from male and female rats
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Type of document |
Journal Article
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Entity Type |
Publication
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