Journal
TOXICOLOGY LETTERS
Volume 231, Issue 1, Pages 29-37Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.toxlet.2014.09.006
Keywords
Sodium selenite; Colonic fibroblasts; p38; Premature senescence; Mitochondria; Autophagy
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Funding
- PRVOUK [P37/01]
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Effects of chronic exposure to supranutritional sodium selenite (Se) were investigated in colonic fibroblasts. Initially, Se did not produce any gross changes in exposed cells; however, basal levels of autophagy were transiently increased and p38 activity was stimulated. From the 3rd week onwards, Se decreased cell proliferation, with corrensponding changes in cell cycle distribution. Also, in exposed cells oxidative stress and DNA damage slowly but gradually increased along with decreasing mitochondrial function and upon continued elevated activity of p38 kinase. Towards the end of the experiment, premature senescence features became more prominent in treated cells. Pharmacological inhibition as well as gene knockdown of these processes confirmed the involvement of p38 in balancing autophagy and premature senescence in cells exposed to Se and suggests that this element may in a given time frame compromise selected cell populations in digestive system. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
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