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MiRNA profiling of MWCNT exposed mice

ABSTRACT: miRNA profiling of MWCNT exposed mice

PROVIDER: PRJNA542675 | ENA |

REPOSITORIES: ENA

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miRNA profiling of blood samples from MWCNT exposed mice

Project description:Pulmonary exposure to multiwalled carbon nanotubes (MWCNT) induces an inflammatory and rapid fibrotic response, although the long-term signaling mechanisms are unknown. The aim of this study was to examine the effects of 1, 10, 40, or 80 μg MWCNT administered by pharyngeal aspiration on bronchoalveolar lavage (BAL) fluid for polymorphonuclear cell (PMN) infiltration, lactate dehydrogenase (LDH) activity, and lung histopathology for inflammatory and fibrotic responses in mouse lungs 1 mo, 6 mo, and 1 yr postexposure. Further, a 120-μg crocidolite asbestos group was incorporated as a positive control for comparative purposes. Results showed that MWCNT increased BAL fluid LDH activity and PMN infiltration in a dose-dependent manner at all three postexposure times. Asbestos exposure elevated LDH activity at all 3 postexposure times and PMN infiltration at 1 mo and 6 mo postexposure. Pathological changes in the lung, the presence of MWCNT or asbestos, and fibrosis were noted at 40 and 80 μg MWCNT and in asbestos-exposed mice at 1 yr postexposure. To identify non-invasive miRNA biomarkers, miRNA profiling was performed in blood samples collected from MWCNT exposed mice.

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Project description:Multi-walled carbon nanotubes (MWCNT) present a wide variety of exciting application opportunities. As MWCNT are produced in large quantities, occupational exposure and human health is of particular concern. However, there is no consensus regarding their potential harmful effects. In particular, chronic exposure to MWCNT and mechanisms of their action at protein and lipid levels are unknown. In this study, we aimed to investigate effects of long-term chronic exposure to MWCNT on cellular proteome and lipidome. Since the lung is the major target organ, an in vitro normal bronchial epithelial cell model was used. To better mimic exposure at occupational settings, cells were chronically exposed for 13 weeks to low-doses of MWCNT. MWCNT-treatment increased ROS levels in cells without increasing DNA damage and resulted in differential expression of multiple apoptotic proteins. A shotgun proteomic and lipidomic analysis of the MWCNT-exposed cells showed that of amongst the >5000 identified protein s,groups; more than 200 were altered in treated cells. Functional analysis revealed association of these differentially regulated proteins in various cellular processes such as cell death and survival, cellular assembly and organization. Similarly, the lipid profile of the MWCNT treated cells showed accumulation of multiple lipid classes. This is first study to present results indicating that long-term MWCNT-exposure of human normal lung cells at occupationally relevant low-dose may alter both the proteome and the lipidome profile of target epithelial cells in the lung.

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