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Prenatal or postnatal exposure to bis(tri-n-butyltin)oxide in the rat: postnatal evaluation of teratology and behavior.

Abstract：

:The results of a series of screening tests to determine the potential teratogenicity and neurotoxicity of developmental exposure to TBTO in rats are presented in this paper. For prenatal exposure, pregnant Long Evans rats were intubated with 0-16 mg/kg/day bis(tri-n-butyltin)oxide TBTO from Days 6 to 20 of gestation (GD 6-20). For postnatal exposure, rat pups were intubated with 0-60 mg/kg TBTO on Postnatal Day 5 (PND 5). Following prenatal exposure, dams were allowed to litter and pups were evaluated using a postnatal teratology screen. Postnatal evaluation for both exposures included motor activity (PND 13-64), the acoustic startle response (PND 22-78), growth, and brain weight. The maximally tolerated dose (MTD) in pregnant rats was 5 mg/kg/day, which is one-third the MTD in nonpregnant rats. There were decreased numbers of live births, and decreased growth and viability at dosages greater than or equal to 10 mg/kg/day. Cleft palate was found in 3% of the 12 mg/kg/day group. There was mortality following postnatal exposure to 60 mg/kg and all prenatal dosages greater than or equal to 10 mg/kg/day. Preweaning body weight was significantly decreased for all postnatal dosages, and all prenatal dosages greater than 2.5 mg/kg/day. Body weight reductions persisted to the postweaning period only in the high dose groups (10 mg/kg/day and 60 mg/kg). Behavioral evaluation demonstrated transient alterations in motor activity development (prenatal exposure only) and the acoustic startle response (postnatal exposure only). Persistent behavioral effects were observed only at dosages that produced overt maternal toxicity and/or postnatal mortality. The demonstration of the teratogenic and neurotoxic potential of TBTO in rats is confounded by associated maternal toxicity and/or pup mortality.

journal_name

Toxicol Appl Pharmacol

journal_title

Toxicology and applied pharmacology

authors

Crofton KM,Dean KF,Boncek VM,Rosen MB,Sheets LP,Chernoff N,Reiter LW

doi

10.1016/0041-008x(89)90060-4

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

113-23

issue

eissn

0041-008X

issn

1096-0333

pii

0041-008X(89)90060-4

journal_volume

pub_type

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Prenatal or postnatal exposure to bis(tri-n-butyltin)oxide in the rat: postnatal evaluation of teratology and behavior.