Induction of a thoracolumbar supernumerary rib in rat developmental toxicity studies: A short discussion on the critical window.

Abstract:

:Thoracolumbar supernumerary ribs (TSRs) are classified as less severe skeletal anomalies in rat developmental toxicity studies, although their incidence is relatively high in rodent studies. To investigate the characteristics of the critical window for chemically-induced TSR, in this study, rats were administered 5-fluorocytocine (5-FC) or sodium salicylate (SAL) at one of three time periods on gestational day (GD) 9, early morning (7:00 am), midday (12:00 pm to 1:00 pm), or late afternoon (4:00 pm or 7:00 pm). The incidence of TSR and other anomalies were assessed in GD20 fetuses. A single treatment with both chemicals on GD9-induced TSR, with the incidence highest when administered at 7:00 Am, decreasing gradually when administered later. This trajectory was clearer in rats treated with 5-FC than with SAL. The critical period of TSR induction is shorter in rats administered 5-FC than SAL. The characteristics of the critical window may cause variability in the incidence of TSR observed in developmental toxicity studies.

journal_name

Congenit Anom (Kyoto)

journal_title

Congenital anomalies

authors

Kuwagata M,Senuma M,Todoroki M,Kumagai F,Kumamoto T,Ogawa T

doi

10.1111/cga.12320

subject

Has Abstract

pub_date

2019-11-01 00:00:00

pages

190-192

issue

6

eissn

0914-3505

issn

1741-4520

journal_volume

59

pub_type

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