title: Peroxiredoxin 1 protects the pea aphid Acyrthosiphon pisum from oxidative stress induced by Micrococcus luteus infection.
abstract: Reactive oxygen species (ROSs) are generated in organisms in response to infections caused by invading microbes. However, excessive ROSs will inflict oxidative damage on the host. Peroxiredoxins (Prxs) are antioxidative enzymes that may eliminate ROSs efficiently. In this study, ApPrx1 from the pea aphid Acyrthosiphon pisum was cloned, and its function was investigated in vitro and in vivo. In the presence of DTT, recombinant ApPrx1 protein from Escherichia coli showed antioxidative activity by eliminating H2O2 effectively. The H2O2 levels were significantly higher in Micrococcus luteus-infected aphids than in uninfected aphids, and ApPrx1 expression was remarkably up-regulated when the aphids were infected with M. luteus or injected with H2O2. When ApPrx1 expression was reduced by dsRNA injection, the survival of the aphids decreased significantly after M. luteus infection. Knockdown of ApPrx1 decreased M. luteus loads inside the aphids 48h post-infection. While under infection conditions, the H2O2 levels were much higher in ApPrx1 knockdown aphids than in dsGFP-injected aphids, indicating that the decreased survival of the aphids was caused by increased oxidative stress. Taken together, our results reveal that ApPrx1 plays a protective role in oxidative stress caused by bacterial infection.
authors.affiliation: Department of Entomology, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China.
authors.forename: Yongdong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Entomology, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Protection Resources and Pest Management, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China. Electronic address: zhiqiang.lu@nwsuaf.edu.cn.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Lu
mesh_terms: D000818:Animals; D001042:Aphids / Q000378:metabolism* / Q000382:microbiology*; D001483:Base Sequence; D015153:Blotting, Western; D054884:Host-Pathogen Interactions / Q000502:physiology; D016982:Micrococcus luteus; D008969:Molecular Sequence Data; D018384:Oxidative Stress; D018532:Pisum sativum / Q000382:microbiology; D054464:Peroxiredoxins / Q000378:metabolism*; D016133:Polymerase Chain Reaction
chemical_list: D054464:Peroxiredoxins
keywords: Acyrthosiphon pisum; Infection; Oxidative stress; Peroxiredoxin; Reactive oxygen species