Effects of bicarbonate and alpha-ketoglutarate on sensitivity of Saccharomyces cerevisiae yeast to hydrogen peroxide and iron ions
| Autor: | M. M. Bayliak |
|---|---|
| Jazyk: | English<br />Ukrainian |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Біологічні студії, Vol 10, Iss 2, Pp 53-62 (2016) |
| Druh dokumentu: | article |
| ISSN: | 1996-4536 2311-0783 |
| DOI: | 10.30970/sbi.1002.490 |
| Popis: | The effects of sodium bicarbonate on the sensitivity of Saccharomyces cerevisiae yeast to hydrogen peroxide and ferrous sulfate were studied. Viability of yeast cells treated with 10–25 mM H2O2 and 0.1–0.2 mM FeSO4 was significantly decreased when 25 or 50 mM NaHCO3 was added to the medium. In the absence of bicarbonate, the levels of oxidative stress markers, namely protein carbonyls, total and oxidized glutathione in cells exposed to 0.2 mM FeSO4 did not differ from such levels in control cells (without FeSO4). Yeast cells incubated with 0.2 mM FeSO4 and 50 mM NaHCO3 had similar levels of oxidized glutathione and carbonyl groups in proteins but lower level of total glutathione compared to cells treated with FeSO4 in the absence of NaHCO3. Yeast cells exposed to a mixture of “2 mM H2O2 + 2 mM FeSO4” in 50 mM sodium bicarbonate buffer survived better than cells treated with these oxidants in 50 mM potassium phosphate buffer. The addition of 10 mM alpha-ketoglutarate led to the increased yeast survival in both buffers under the treatment with “Fe2+/Н2О2”. The protective effect of alpha-ketoglutarate can be due to its H2O2-scavenging activity. The results suggest that bicarbonate ions can enhance or alleviate the toxic effects of redox-active compounds on S. cerevisiae. Pro/antioxidant effects of bicarbonate ions are likely to depend on the kinetics of interaction between HCO3ˉ and produced ROS. |
| Databáze: | Directory of Open Access Journals |
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