Project description:The potential environmental risk of single-walled carbon nanotubes (SWCNTs) is evaluated using Caenorhabditis elegans (C. elegans) as an ecotoxicological animal model. Highly soluble amide-modified SWCNTs (a-SWCNTs) are used in the present study so that the dose-response impact of SWCNTs could be studied. mechanisms. a-SWCNTs are efficiently taken up by worms during feeding and cause significant toxicity in worms, including retarded growth, shortened lifespan and defective embryogenesis. Genome-wide gene expression analysis is performed to investigate the toxic molecular
Project description:The potential environmental risk of single-walled carbon nanotubes (SWCNTs) is evaluated using Caenorhabditis elegans (C. elegans) as an ecotoxicological animal model. Highly soluble amide-modified SWCNTs (a-SWCNTs) are used in the present study so that the dose-response impact of SWCNTs could be studied. mechanisms. a-SWCNTs are efficiently taken up by worms during feeding and cause significant toxicity in worms, including retarded growth, shortened lifespan and defective embryogenesis. Genome-wide gene expression analysis is performed to investigate the toxic molecular We examined the effect of different concentrations of a-SWCNTs (0, 100, 250 and 500 μg/mL) on the growth of C. elegans. We measured the body length of worms reaching the L4 stage after a-SWCNT exposure for 48 hr at 22°C. Compared to the untreated worms, we found that the average length of worms exposed to a-SWCNTs (500 μg mL-1) was significantly shorter than the untreated groups. In addition, the dose of a-SWCNTs also caused retarded growth, reduced lifespan and defective embryogenesis in worms. Genome-wide gene expression analysis using an Affymetrix GeneChip was performed to further investigate the molecular basis of these defects.
Project description:In order to evaluate the identification of genes and pathways, the global gene expression profiles were assessed in response to multiwall carbon nanotube (MWCNT) on the soil nematode, Caenorhabditis elegans. We performed whole genome DNA microarray experiments with subsequent quantitative analysis conducted on selected genes. We used synchronized C. elegans populations exposed to MWCNT for 4 and 24h, and whole genome microarrays to screen for global changes in C. elegans transcription profiles. Young adults of C.elegans were selected for RNA extraction and hybridization on Affymetrix microarrays.
Project description:To evaluate the biological effects at the transcriptional level of manufactured nanomaterials, we performed whole genome microarrays of rat alveolar macrophages (NR8383) exposed to multi-walled carbon nanotubes (MWCNTs) with different physicochemical properties.
Project description:The microarray investigations were part of a toxicological investigation of the effect of exposure to single-walled carbon nanotubes (SWCNTs) to macrophages and non-phagocytotic cells The results of this study are accepted for publication in Toxicological Research with the title: The toxic effects of single-wall carbon nanotubes are linked to the phagocytic ability of cells
