Abstract
The effects of oxidative stress (OS) on the rat erythrocytes (RBCs) that were fractionated on the percoll/BSA gradient into young and old cells were studied to find out if the altered Na+ /H+ and Cl−/HCO3 − antiporters and in turn the intracellular pH (pHi) could act as one of the promoters of cell death. Old cells were more spherical with lesser surface area, more fragile osmotically and had lesser protein sulphydryl content than the young cells. OS was induced in RBCs by 2,2′-azobis (2-amidinopropane) dihydrochloride (AAPH). AAPH increased the superoxide dismutase (SOD) activity and MDA level and, the changes between the young and old. Interestingly, vitamin C was effective in reducing MDA in the old. Further, in the old a rapid Na+-dependent acidification in the presence of AAPH and a marginal acidosis in the presence of vitamin C were evident. Old RBCs exhibited higher acidosis and vitamin C was less effective in lowering the stress-induced acidosis compared to the young. Our studies suggest that increased acidosis followed by low intracellular pH could be one of the determinant factors for the disappearance of old RBCs from circulation, and perhaps of the young too under OS.
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Acknowledgments
The present study was supported by the grants received by the Department of Science and Technology (DST, SP/SO/AS-58/2004), New Delhi to Ms. S. Asha Devi. We would like to thank Ms. R. Vani, for the technical assistance and Prof. M.A. Yadugiri for editing the initial draft of the manuscript.
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Asha Devi, S., Shiva Shankar Reddy, C.S. & Subramanyam, M.V.V. Oxidative stress and intracellular pH in the young and old erythrocytes of rat. Biogerontology 10, 659–669 (2009). https://doi.org/10.1007/s10522-009-9212-8
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DOI: https://doi.org/10.1007/s10522-009-9212-8