Reduction in Glutathione Peroxidase 4 Increases Life Span Through Increased Sensitivity to Apoptosis
Open Access
- 1 September 2007
- journal article
- research article
- Published by Oxford University Press (OUP) in The Journals of Gerontology: Series A
- Vol. 62 (9), 932-942
- https://doi.org/10.1093/gerona/62.9.932
Abstract
Glutathione peroxidase 4 (Gpx4) is an antioxidant defense enzyme that plays an important role in detoxification of oxidative damage to membrane lipids. Because oxidative stress is proposed to play a causal role in aging, we compared the life spans of Gpx4 heterozygous knockout mice (Gpx4+/− mice) and wild-type mice (WT mice). To our surprise, the median life span of Gpx4+/− mice (1029 days) was significantly longer than that of WT mice (963 days) even though the expression of Gpx4 was reduced approximately 50% in all tissues of Gpx4+/− mice. Pathological analysis revealed that Gpx4+/− mice showed a delayed occurrence of fatal tumor lymphoma and a reduced severity of glomerulonephritis. Compared to WT mice, Gpx4+/− mice showed significantly increased sensitivity to oxidative stress-induced apoptosis. Our data indicate that lifelong reduction in Gpx4 increased life span and reduced/retarded age-related pathology most likely through alterations in sensitivity of tissues to apoptosis.Keywords
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