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Published on: March 28, 2017
Ultrafine carbon particles down-regulate CYP1B1 expression in human monocytes.
Christiane Eder1, Marion Frankenberger, Franz Stanzel
1Helmholtz Zentrum Muenchen, German Research Center for Environmental Health, Clinical Cooperation Group Inflammatory Lung Diseases, Institute of Lung Biology and Disease and Asklepios Fachkliniken Muenchen-Gauting, Robert-Koch-Allee 29, 82131 Gauting, Germany. hofer@helmholtz-muenchen.de.
Ultrafine carbon black particles (P90) significantly down-regulate cytochrome P450 1B1 (CYP1B1) gene expression in human lung and immune cells. This reduction may impair the body's ability to activate or detoxify inhaled toxins.
Area of Science:
- Environmental Toxicology
- Molecular Biology
- Cellular Biology
Background:
- Cytochrome P450 (CYP) enzymes are crucial for metabolizing xenobiotics and environmental contaminants.
- Ultrafine particles in ambient aerosol penetrate deep into the lungs, posing health risks to lung epithelial cells and macrophages.
Purpose of the Study:
- To investigate the effect of fine titanium dioxide (TiO2) and ultrafine carbon black Printex 90 (P90) particles on CYP1B1 expression in human monocytes, macrophages, and bronchial epithelial cells.
Main Methods:
- Exposure of human monocytes, macrophages, bronchial epithelial cells, and cell lines to TiO2 and P90 particles.
- Analysis of CYP1B1 and CYP1A1 mRNA levels using quantitative PCR.
- Assessment of CYP1B1 protein levels via Western blot analysis.
- Investigation of P90 effects in the presence of benzo[a]pyrene (BaP).
Main Results:
- P90 significantly down-regulated CYP1B1 mRNA in monocytes (up to 130-fold) and CYP1A1 mRNA (13-fold).
- TiO2 particles (fine and ultrafine) showed no effect on CYP1B1 expression.
- Reduced CYP1B1 mRNA levels were observed in monocyte-derived macrophages, epithelial cell lines, and primary bronchial epithelial cells.
- P90 suppressed CYP1B1 induction by benzo[a]pyrene and reduced protein levels.
Conclusions:
- P90 exposure leads to a significant reduction in CYP gene expression in relevant lung and immune cells.
- This P90-induced down-regulation of CYP may compromise the metabolic activation and detoxification of inhaled toxic compounds.
