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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Function of RSKS-1-AAK-2-DAF-16 signaling cascade in enhancing toxicity of multi-walled carbon nanotubes can be suppressed by mir-259 activation in Caenorhabditis elegans.
Scientific Reports 2016 August 31
Caenorhabditis elegans is an important non-mammalian alternative assay model for toxicological study. Previous study has indicated that exposure to multi-walled carbon nanotubes (MWCNTs) dysregulated the transcriptional expression of mir-259. In this study, we examined the molecular basis for mir-259 in regulating MWCNTs toxicity in nematodes. Mutation of mir-259 induced a susceptible property to MWCNTs toxicity, and MWCNTs exposure induced a significant increase in mir-259::GFP in pharyngeal/intestinal valve and reproductive tract, implying that mir-259 might mediate a protection mechanisms for nematodes against MWCNTs toxicity. RSKS-1, a putative ribosomal protein S6 kinase, acted as the target for mir-259 in regulating MWCNTs toxicity, and mutation of rsks-1 suppressed the susceptible property of mir-259 mutant to MWCNTs toxicity. Moreover, mir-259 functioned in pharynx-intestinal valve and RSKS-1 functioned in pharynx to regulate MWCNTs toxicity. Furthermore, RSKS-1 regulated MWCNTs toxicity by suppressing the function of AAK-2-DAF-16 signaling cascade. Our results will strengthen our understanding the microRNAs mediated protection mechanisms for animals against the toxicity from certain nanomaterials.
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