Effect of antioxidants on the H2O2-induced premature senescence of human fibroblasts.

Abstract:

:The study was aimed at evaluation of the role of secondary oxidative stress in the stress-induced premature senescence (SIPS) of human fibroblasts induced by H2O2. Two fibroblast lines were used: lung MRC-5 and ear H8F2p25LM fibroblasts. The lines differed considerably in sensitivity to H2O2 (IC50 of 528 and 33.5 μM, respectively). The cells were exposed to H2O2 concentrations corresponding to IC50 and after 24 h supplemented with a range of antioxidants. Most of antioxidants studied slightly augmented the survival of fibroblasts at single concentrations or in a narrow concentration range, but the results were not consistent among the cell lines. Chosen antioxidants (4-amino-TEMPO, curcumin, caffeic acid and p-coumaric acid) did not restore the level of glutathione decreased by H2O2. Hydrogen peroxide treatment did not induce secondary production of H2O2 and even decreased it, decreased mitochondrial potential in both cell lines and induced changes in the mitochondrial mass inconsistent between the lines. Antioxidant protected mitochondrial potential only in H8F2p25LM cells, but attenuated changes in mitochondrial mass. These results speak against the intermediacy of secondary oxidative stress in the SIPS induced by H2O2 and suggest that the small protective action of antioxidants is due to their effects on mitochondria.

journal_name

Aging (Albany NY)

journal_title

Aging

authors

Pieńkowska N,Bartosz G,Pichla M,Grzesik-Pietrasiewicz M,Gruchala M,Sadowska-Bartosz I

doi

10.18632/aging.102730

subject

Has Abstract

pub_date

2020-01-21 00:00:00

pages

1910-1927

issue

2

issn

1945-4589

pii

102730

journal_volume

12

pub_type

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