Plasma retinol, carotene and vitamin E concentrations and lung function in a crocidolite-exposed cohort from Wittenoom, Western Australia: a cohort study.
BACKGROUND
Increased rates of death from asbestos related diseases have been reported for people previously employed in the mining and milling operations at Wittenoom (Western Australia), and people who lived in the nearby town, where they were environmentally exposed to crocidolite.


METHODS
Annual measurements of forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) and plasma concentrations of retinol, carotene and vitamin E have been made since 1992. Mixed effects models were used to examine the associations between lung function and the plasma vitamin levels of retinol, carotene and vitamin E.


RESULTS
After adjusting for potential confounders, higher plasma retinol and carotene concentrations were significantly associated with higher levels of lung function at entry into the study, while vitamin E concentrations were associated with lower entry lung function. Retinol was associated with a less steep decline of lung function over time, while carotene concentrations were associated with an increased decline of lung function over time and vitamin E levels were not associated with changes of lung function over time.


CONCLUSIONS
These results support a beneficial relationship between plasma concentrations of retinol on the levels and rates of change of lung function, while showing no such consistent beneficial effect for plasma levels of beta-carotene or vitamin E.
Alfonso
Helman S
HS
School of Population Health, University of Western Australia, Perth, Western Australia, Australia. h.alfonso@curtin.edu.au
Fritschi
Lin
L
de Klerk
Nicholas H
NH
Ambrosini
Gina
G
Beilby
John
J
Olsen
Nola
N
Musk
A William
AW
D017638:Asbestos, Crocidolite / Q000633:toxicity*; D002338:Carotenoids / Q000097:blood*; D004781:Environmental Exposure; D006801:Humans; D016273:Occupational Exposure; D012129:Respiratory Function Tests; D012907:Smoking; D014801:Vitamin A / Q000097:blood*; D014810:Vitamin E / Q000097:blood*; D014904:Western Australia
D014801:Vitamin A; D017638:Asbestos, Crocidolite; D014810:Vitamin E; D002338:Carotenoids