Cell dualism: presence of cells with alternative membrane potentials in growing populations of bacteria and yeasts
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- 作者：Volodymyr Ivanov ; Saeid Rezaeinejad ; Jian Chu
- 关键词：Membrane potential ; Flow cytometry ; Ion fluxes
- 刊名：Journal of Bioenergetics and Biomembranes
- 出版年：2013
- 出版时间：October 2013
- 年：2013
- 卷：45
- 期：5
- 页码：505-510
- 全文大小：400KB
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Saeid Rezaeinejad (2)
Jian Chu (1)
1. Department of Civil, Construction & Environmental Engineering, Iowa State University, 327 Town Engineering Building, Ames, IA, 50011, USA
2. Department of Civil and Environmental Engineering, Faculty of Engineering, National University of Singapore, Engineering Drive 1, Singapore, 117576, Singapore - ISSN：1573-6881
文摘
It is considered that all growing cells, for exception of acidophilic bacteria, have negatively charged inside cytoplasmic membrane (Δψ?/sup> - cells). Here we show that growing populations of microbial cells contain a small portion of cells with positively charged inside cytoplasmic membrane (Δψ+ - cells). These cells were detected after simultaneous application of the fluorescent probes for positive membrane potential (anionic dye DIBAC-) and membrane integrity (propidium iodide, PI). We found in exponentially growing cell populations of Escherichia coli and Saccharomyces cerevisiae that the content of live Δψ- - cells was 93.6?±-.8?% for bacteria and 90.4?±-.0?% for yeasts and the content of live Δψ+ - cells was 0.9?±-.3?% for bacteria and 2.4?±-.7?% for yeasts. Hypothetically, existence of Δψ+ - cells could be due to short-term, about 1?min for bacteria and 5?min for yeasts, change of membrane potential from negative to positive value during the cell cycle. This change has been shown by the reversions of K+, Na+, and Ca2+ ions fluxes across the cell membrane during synchronous yeast culture. The transformation of Δψ-- cells to Δψ+ - cells can be explained by slow influx of K+ ions into Δψ-- cell to the trigger level of K+ concentration (“compression of potassium spring-, which is forming “alternative-Δψ+-cell for a short period, following with fast efflux of K+ ions out of Δψ+-cell (“release of potassium spring- returning cell to normal Δψ- state. We anticipate our results to be a starting point to reveal the biological role of cell dualism in form of Δψ- - and Δψ+ - cells.