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Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

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AX4-35<br />

Table AX4-8 (cont’d). Bone <strong>Lead</strong> Studies <strong>of</strong> Menopausal and Middle-aged to Elderly Subjects<br />

Reference, Study<br />

Location, and<br />

Period Study Description<br />

Mexico<br />

Garrido-Latorre<br />

et al. (2003)<br />

Mexico City<br />

1995<br />

Australia<br />

Gulson et al.<br />

(2002)<br />

Sydney, Australia<br />

2000<br />

PbB = blood lead.<br />

Aim was to examine the relationship <strong>of</strong><br />

PbB levels to menopause and bone lead<br />

levels in 232 perimenopausal and<br />

postmenopausal women from Mexico<br />

City. Measured bone mineral density in<br />

addition to bone Pb. In<strong>for</strong>mation<br />

regarding reproductive characteristics<br />

and known risk factors <strong>for</strong> PbB was<br />

obtained using a standard questionnaire<br />

by direct interview. Mean age <strong>of</strong> the<br />

population was 54.7 yrs (±9.8). Linear<br />

regression analyses.<br />

Environmentally exposed females (n = 7)<br />

and males (n = 3) aged 44-70 yr. Treated<br />

<strong>for</strong> 6 mo with the bisphosphonate<br />

alendronate. PbB and isotopic ratios<br />

measured by TIMS <strong>for</strong> 6 mo prior to<br />

treatment and 12 mo post-treatment.<br />

Bone mineral density and bone markers<br />

including NT x measured.<br />

<strong>Lead</strong> Measurement (SD or range)<br />

PbB in µg/dL, Bone Pb in µg/g Bone Mineral Findings, Interpretation<br />

PbB 9.2 (±4.7), tibia 14.85 (±10.1), patella 22.73<br />

(±14.9).<br />

A change <strong>of</strong> 10 µg Pb/g bone mineral in<br />

postmenopausal subjects was associated with an<br />

increase in PbB <strong>of</strong> 1.4 µg/dL, whereas a similar<br />

change in bone lead among premenopausal women<br />

was associated with an increase in PbB <strong>of</strong> 0.8 µg/dL.<br />

Found a decrease in PbB concentrations and changing<br />

PbB isotopic composition in the direction predicted<br />

during treatment. Upon cessation <strong>of</strong> treatment, PbB<br />

increased and the isotopic compositions changed.<br />

Found that postmenopausal women using hormone<br />

replacement therapy had lower PbB levels and<br />

higher tibia and patella bone Pb levels than nonusers;<br />

patella Pb explained the greatest part <strong>of</strong><br />

variations in PbB. Found no association with PbB<br />

levels and did not describe any relationships<br />

between bone lead and bone density.<br />

Results consistent with changes in bone remodeling<br />

associated with bisphosphonate use.

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