ROS regulation of RAS and vulva development in Caenorhabditis elegans
Autoři:
Maximilian Kramer-Drauberg aff001; Ju-Ling Liu aff001; David Desjardins aff001; Ying Wang aff001; Robyn Branicky aff001; Siegfried Hekimi aff001
Působiště autorů:
Department of Biology, McGill University, Montréal, Québec, Canada
aff001
Vyšlo v časopise:
ROS regulation of RAS and vulva development in Caenorhabditis elegans. PLoS Genet 16(6): e32767. doi:10.1371/journal.pgen.1008838
Kategorie:
Research Article
doi:
https://doi.org/10.1371/journal.pgen.1008838
Souhrn
Reactive oxygen species (ROS) are signalling molecules whose study in intact organisms has been hampered by their potential toxicity. This has prevented a full understanding of their role in organismal processes such as development, aging and disease. In Caenorhabditis elegans, the development of the vulva is regulated by a signalling cascade that includes LET-60ras (homologue of mammalian Ras), MPK-1 (ERK1/2) and LIN-1 (an ETS transcription factor). We show that both mitochondrial and cytoplasmic ROS act on a gain-of-function (gf) mutant of the LET-60ras protein through a redox-sensitive cysteine (C118) previously identified in mammals. We show that the prooxidant paraquat as well as isp-1, nuo-6 and sod-2 mutants, which increase mitochondrial ROS, inhibit the activity of LET-60rasgf on vulval development. In contrast, the antioxidant NAC and loss of sod-1, both of which decrease cytoplasmic H202, enhance the activity of LET-60rasgf. CRISPR replacement of C118 with a non-oxidizable serine (C118S) stimulates LET-60rasgf activity, whereas replacement of C118 with aspartate (C118D), which mimics a strongly oxidised cysteine, inhibits LET-60rasgf. These data strongly suggest that C118 is oxidized by cytoplasmic H202 generated from dismutation of mitochondrial and/or cytoplasmic superoxide, and that this oxidation inhibits LET-60ras. This contrasts with results in cultured mammalian cells where it is mostly nitric oxide, which is not found in worms, that oxidizes C118 and activates Ras. Interestingly, PQ, NAC and the C118S mutation do not act on the phosphorylation of MPK-1, suggesting that oxidation of LET-60ras acts on an as yet uncharacterized MPK-1-independent pathway. We also show that elevated cytoplasmic superoxide promotes vulva formation independently of C118 of LET-60ras and downstream of LIN-1. Finally, we uncover a role for the NADPH oxidases (BLI-3 and DUOX-2) and their redox-sensitive activator CED-10rac in stimulating vulva development. Thus, there are at least three genetically separable pathways by which ROS regulates vulval development.
Klíčová slova:
Caenorhabditis elegans – Cysteine – Hydrogen peroxide – Mitochondria – Oxidation – Superoxide dismutase – Superoxides – Vulva
Zdroje
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