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Mech Ageing Dev. 2015 Jul;149:88-98. doi: 10.1016/j.mad.2015.06.001. Epub 2015 Jun 6.

Characterization of skn-1/wdr-23 phenotypes in Caenorhabditis elegans; pleiotrophy, aging, glutathione, and interactions with other longevity pathways.

Author information

1
Department of Biology and Genetics Institute, University of Florida, Gainesville, FL 32611, United States.
2
Department of Biology and Genetics Institute, University of Florida, Gainesville, FL 32611, United States. Electronic address: kchoe@ufl.edu.

Abstract

The SKN-1/Nrf transcription factors are master regulators of oxidative stress responses and are emerging as important determinants of longevity. We previously identified a protein named WDR-23 as a direct repressor of SKN-1 in C. elegans. Loss of wdr-23 influences stress resistance, longevity, development, and reproduction, but it is unknown if WDR-23 influences development and reproduction solely through SKN-1 and the mechanisms by which SKN-1 promotes stress resistance and longevity are poorly defined. Here, we characterize phenotypes of wdr-23 and skn-1 manipulation and explore the role of glutathione. We provide evidence that diverse wdr-23 phenotypes are dependent on SKN-1, that beneficial and detrimental phenotypes of wdr-23 and skn-1 can be partially decoupled, and that SKN-1 activation delays degenerative tissue changes during aging. We also show that total glutathione levels are substantially elevated when the wdr-23/skn-1 pathway is activated and that skn-1 is required for preserving this cellular antioxidant during stress and aging. Alternatively, total glutathione was not elevated in worms with reduced insulin/IGF-1-like signaling or dietary restriction suggesting that SKN-1 ensures longevity via different mechanisms under these conditions. Lastly, genetic interaction data revise our understanding of which skn-1 variants are required for longevity during dietary restriction.

KEYWORDS:

Detoxification; Dietary restriction; Nrf2

PMID:
26056713
DOI:
10.1016/j.mad.2015.06.001
[Indexed for MEDLINE]

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