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

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AX5-44<br />

Citation<br />

Wiebe et al.<br />

(1998)<br />

Table AX5-4.1 (cont’d). Effect <strong>of</strong> <strong>Lead</strong> on Reproduction and Development in Mammals Effects on Offspring<br />

Species/<br />

Strain/Age<br />

Rats/Sprague-<br />

Dawley, adult<br />

Dose/Route/<br />

Form/Duration Endpoint<br />

20 or 200 ppm Pb chloride in<br />

drinking water; prior to<br />

pregnancy, during pregnancy,<br />

lactation<br />

*Not including effects on the nervous or immune systems.<br />

† Candidate key study.<br />

Exposure to Pb did not affect tissue weights but did cause a significant decrease in<br />

gonadotropin-receptor binding in the prepubertal, pubertal, and adult females;<br />

conversion <strong>of</strong> progesterone to androstenedione and dihydrotestosterone was<br />

significantly decreased in 21-day old rats, in 150-day old females, the exposure to Pb<br />

resulted in significantly increased conversion to the 5-alpha-reduced steroids, normally<br />

high during puberty.<br />

Blood <strong>Lead</strong> Concentration<br />

(PbB)<br />

PbB 4.0 ± 1.4 to 6.6 ± 2.3 µg/dL<br />

cGMP, cyclic guanosine—3',5'-monophosphate; DO, distraction osteogenesis; DOPAc, 3,4-dihydroxyphenylacetic acid; E2, estradiol; ERG, electroretinographic; FSH, follicle stimulating hormone;<br />

GD, gestational day; IGF1, insulin-like growth factor 1; i.v., intravenous; kDA, kilodalton; LH, luteinizing hormone; NOS, not otherwise specified; PbB, blood Pb concentration; PDE,<br />

phosphodiesterase; PND, post-natal day; p.o., per os (oral administration); s.c., subcutaneous; SEM, standard error mean; UDP, uridine diphosphate; VMA, vanilmandelic acid

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