Benchmark dose for cadmium-induced osteoporosis in women.
We applied a hybrid approach to estimate the benchmark dose (BMD) and the lower 95% confidence limit (BMDL) for cadmium-induced bone effects in a population with low environmental exposure. Morning urine samples were collected by 794 Swedish women, aged 53-64 years, participating in a population-based study. We measured urinary cadmium (U-Cd), a marker of long-term exposure, and bone mineral density, expressed as its T-score (reference: 20-year old women) of the non-dominant wrist. BMD and BMDL, adjusted for relevant covariates, corresponding to an additional risk (BMR) of 5% or 10% were calculated, with the background risk at zero exposure set at 1% or 5%. With a BMR of 5% and a background risk of having low bone mineral density (at U-Cd = 0) of 1% or 5% (corresponding to T-score cut-offs -2.75 and -2.09, respectively), the BMD of U-Cd ranged 1.8-3.7 microg/g creatinine, and the BMDL ranged 1.0-2.1 microg/g creatinine. For a 5% BMR of osteoporosis (T-score < -2.5), the BMD was 2.9 microg/g creatinine and the BMDL 1.6 microg/g creatinine. The lowest obtained BMD of U-Cd for wrist bone mineral density was only slightly higher than the lowest reference concentration previously reported for cadmium-related kidney effects. Our results provide additional scientific support for the low tolerably weekly intake (TWI) of cadmium set by the European Food Safety Authority in 2009.
Suwazono
Yasushi
Y
Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.
Sand
Salomon
S
Vahter
Marie
M
Skerfving
Staffan
S
Lidfeldt
Jonas
J
Akesson
Agneta
A
D015519:Bone Density / Q000187:drug effects; D002104:Cadmium / Q000633:toxicity* / Q000652:urine; D004305:Dose-Response Relationship, Drug; D004785:Environmental Pollutants / Q000633:toxicity* / Q000652:urine; D005260:Female; D006801:Humans; D016014:Linear Models; D008875:Middle Aged; D015663:Osteoporosis, Postmenopausal / Q000139:chemically induced*; D013548:Sweden
D004785:Environmental Pollutants; D002104:Cadmium