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Is propylene oxide induced cell proliferation in rat nasal respiratory epithelium mediated by a severe depletion of water-soluble non-protein thiol?
- Source :
-
Toxicology letters [Toxicol Lett] 2009 Mar 28; Vol. 185 (3), pp. 203-10. - Publication Year :
- 2009
-
Abstract
- Propylene oxide (PO) concentrations >or=300 ppm induced cell proliferation and tumors in rat nasal respiratory epithelium (NRE). Cell proliferation was suggested to result from depletion of glutathione (GSH) in NRE. In order to substantiate this hypothesis, cell proliferation - measured by bromodeoxyuridine incorporation into DNA of the epithelium lining middle septum, dorsal medial meatus, and medial and lateral surfaces of the nasoturbinate in transverse nasal sections taken immediately posterior to the upper incisor teeth - and water-soluble non-protein thiol (NPSH) in NRE were determined after exposing male Fischer 344 rats to 50 ppm, 100 ppm, 200 ppm, or 300 ppm PO (6 h/day, 3 days). Both parameters were also investigated after treating rats for 3 days with diethylmaleate (DEM; 2 x 250 mg/kg/day or 500 + 150 mg/kg/day) or buthionine sulfoximine (BSO; 500 mg/kg/day). Exposure to 50 ppm PO and treatment with 2 x2 50 mg/kg/day DEM resulted in NPSH levels approximating 50% and 80% of the level in untreated controls, respectively. Cell proliferation did not increase. After exposures to >or= 100 ppm PO or treatment with BSO or 500 + 150 mg/kg/day DEM, NPSH was depleted to <or=1/3 of the control level and cell proliferation increased 2.0-3.7-fold the control value. In conclusion, profound perturbation of the GSH status may represent a crucial step in PO induced rat nasal tumorigenicity.
- Subjects :
- Animals
Buthionine Sulfoximine pharmacology
Dose-Response Relationship, Drug
Male
Maleates pharmacology
Nasal Mucosa pathology
Nose Neoplasms chemically induced
Nose Neoplasms metabolism
Nose Neoplasms pathology
Rats
Rats, Inbred F344
Solubility
Time Factors
Air Pollutants toxicity
Cell Proliferation drug effects
Epoxy Compounds toxicity
Glutathione metabolism
Nasal Mucosa drug effects
Sulfhydryl Compounds metabolism
Water chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 0378-4274
- Volume :
- 185
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Toxicology letters
- Publication Type :
- Academic Journal
- Accession number :
- 19382340
- Full Text :
- https://doi.org/10.1016/j.toxlet.2009.01.009