Peripheral blood effects in benzene-exposed workers.
The hematotoxic effects of benzene exposure may be important in the occurrence of subsequent health effects. We sought to provide further information on peripheral blood effects by studying 928 workers in five factories in and around Shanghai, China exposed to a wide range of benzene concentrations. Specifically, we sought to investigate which blood indices are more strongly related to benzene exposure and which concentration levels of benzene result in peripheral blood changes. Lifestyle habits and demographic information was obtained via questionnaire, and potentially important genetic influences were determined by assessing single nucleotide polymorphisms in four genes (NQO1, MPO, CYP2E1, GSTT1). Weekly benzene exposure estimated from individual monitoring results ranged from 0.07 to 872 mg/m(3) with a median value of 7.4 mg/m(3). Twelve peripheral blood indices were examined. Stronger effects on peripheral blood were seen for red cell indices such as anemia and macrocytosis, albeit at higher (>10 ppm) exposure levels. The most sensitive parameters to benzene appeared to be neutrophils and the mean platelet volume (MPV), where effects were seen for benzene air concentrations of 7.8-8.2 ppm. Toluene exposure is a potential confounder for some peripheral blood effects, pointing to the need to scrutinize levels of both compounds in the occupational environment.
Robert Schnatter
A
A
ExxonMobil Biomedical Sciences, Inc, 1545 Route 22 East, Annandale, NJ 08801, United States. a.r.schnatter@exxonmobil.com
Kerzic
Patrick J
PJ
Zhou
Yimei
Y
Chen
Min
M
Nicolich
Mark J
MJ
Lavelle
Karlene
K
Armstrong
Thomas W
TW
Bird
Michael G
MG
Lin
Lv
L
Fu
Hua
H
Irons
Richard D
RD
D000328:Adult; D001554:Benzene / Q000009:adverse effects*; D001773:Blood Cells / Q000187:drug effects*; D004247:DNA / Q000097:blood / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D020022:Genetic Predisposition to Disease; D006403:Hematologic Tests; D006801:Humans; D008297:Male; D016273:Occupational Exposure / Q000009:adverse effects*; D020641:Polymorphism, Single Nucleotide; D014050:Toluene / Q000009:adverse effects
D014050:Toluene; D004247:DNA; D001554:Benzene