Article ; Online: Inferred inactivation of the Cftr gene in the duodena of mice exposed to hexavalent chromium (Cr(VI)) in drinking water supports its tumor-suppressor status and implies its potential role in Cr(VI)-induced carcinogenesis of the small intestines.
Toxicology and applied pharmacology
2021 Volume 433, Page(s) 115773
Abstract: Carcinogenicity of hexavalent chromium [Cr (VI)] has been supported by a number of epidemiological and animal studies; however, its carcinogenic mode of action is still incompletely understood. To identify mechanisms involved in cancer development, we ... ...
Abstract | Carcinogenicity of hexavalent chromium [Cr (VI)] has been supported by a number of epidemiological and animal studies; however, its carcinogenic mode of action is still incompletely understood. To identify mechanisms involved in cancer development, we analyzed gene expression data from duodena of mice exposed to Cr(VI) in drinking water. This analysis included (i) identification of upstream regulatory molecules that are likely responsible for the observed gene expression changes, (ii) identification of annotated gene expression data from public repositories that correlate with gene expression changes in duodena of Cr(VI)-exposed mice, and (iii) identification of hallmark and oncogenic signature gene sets relevant to these data. We identified the inactivated CFTR gene among the top scoring upstream regulators, and found positive correlations between the expression data from duodena of Cr(VI)-exposed mice and other datasets in public repositories associated with the inactivation of the CFTR gene. In addition, we found enrichment of signatures for oncogenic signaling, sustained cell proliferation, impaired apoptosis and tissue remodeling. Results of our computational study support the tumor-suppressor role of the CFTR gene. Furthermore, our results support human relevance of the Cr(VI)-mediated carcinogenesis observed in the small intestines of exposed mice and suggest possible groups that may be more vulnerable to the adverse outcomes associated with the inactivation of CFTR by hexavalent chromium or other agents. Lastly, our findings predict, for the first time, the role of CFTR inactivation in chemical carcinogenesis and expand the range of plausible mechanisms that may be operative in Cr(VI)-mediated carcinogenesis of intestinal and possibly other tissues. |
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MeSH term(s) | Administration, Oral ; Animals ; Cell Transformation, Neoplastic/chemically induced ; Cell Transformation, Neoplastic/genetics ; Cell Transformation, Neoplastic/metabolism ; Cell Transformation, Neoplastic/pathology ; Chromium/administration & dosage ; Chromium/toxicity ; Cystic Fibrosis Transmembrane Conductance Regulator/genetics ; Cystic Fibrosis Transmembrane Conductance Regulator/metabolism ; Databases, Genetic ; Drinking Water ; Duodenal Neoplasms/chemically induced ; Duodenal Neoplasms/genetics ; Duodenal Neoplasms/metabolism ; Duodenal Neoplasms/pathology ; Duodenum/drug effects ; Duodenum/metabolism ; Duodenum/pathology ; Gene Expression Profiling ; Gene Silencing/drug effects ; Mice ; Risk Assessment ; Systems Biology ; Transcriptome ; Tumor Suppressor Proteins/genetics ; Tumor Suppressor Proteins/metabolism ; Water Pollutants, Chemical/administration & dosage ; Water Pollutants, Chemical/toxicity |
Chemical Substances | Cftr protein, mouse ; Drinking Water ; Tumor Suppressor Proteins ; Water Pollutants, Chemical ; Chromium (0R0008Q3JB) ; Cystic Fibrosis Transmembrane Conductance Regulator (126880-72-6) ; chromium hexavalent ion (18540-29-9) |
Language | English |
Publishing date | 2021-10-22 |
Publishing country | United States |
Document type | Journal Article |
ZDB-ID | 204477-8 |
ISSN | 1096-0333 ; 0041-008X |
ISSN (online) | 1096-0333 |
ISSN | 0041-008X |
DOI | 10.1016/j.taap.2021.115773 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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