Effect of sulfur dioxide inhalation on CYP2B1/2 and CYP2E1 in rat liver and lung.

Abstract:

:Sulfur dioxide (SO2) is a ubiquitous air pollutant, present in low concentrations in the urban air and in higher concentrations in the working environment. In this study, we investigated the effects of inhaled SO2 on the O-dealkylase of pentoxyresorufin (PROD) and p-nitrophenol hydroxylases (p-NP) activities and mRNA levels of CYP2B1/2 and CYP2E1 in the lung and liver of Wistar rats. Male Wistar rats were housed in exposure chambers and treated with 14.11 +/- 1.53, 28.36 +/- 2.12, and 56.25 +/- 4.28 mg/m3 SO2 for 6 h/day for 7 days, while control rats were exposed to filtered air in the same condition. The mRNAs of CYP2B1/2 and -2E1 were analyzed in livers and lungs by using reverse-transcription polymerase chain reaction (RT-PCR). Our results showed that the PROD activities and mRNA of CYP2B1/2 were decreased in livers and lungs of rats exposed to SO2. The p-NP activities and mRNA of CYP2E1 were decreased in lungs but not in livers of rats exposed to SO2. Total liver microsomal cytochrome P-450 (CYP) contents were diminished in SO2-exposed rats. These results lead to two conclusions: (1) SO2 exposure can suppress CYP2B1/2 and CYP2E1 in lungs and CYP2B1/2 in livers of rats, thus modifying the liver and lung toxication/detoxication potential, and (2) the total liver microsomal CYP contents were diminished, although the activity and mRNA expression of CYP2E1 in rat livers were not affected by SO2 exposure.

journal_name

Inhal Toxicol

journal_title

Inhalation toxicology

authors

Qin G,Meng Z

doi

10.1080/08958370600686341

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

581-8

issue

8

eissn

0895-8378

issn

1091-7691

pii

X221G3UVV8236716

journal_volume

18

pub_type

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