[Effects of basic orange II on proliferation and differentiation of limb bud cells in rat embryos]

To explore the effects of basic orange II on proliferation and differentiation of limb bud cells.

Limb bud cell were separated from SD rat embryo at 13-day gestational age, limb bud cell were exposed to basic orange II at concentrations of 0.0, 12.5, 25.0, 50.0, 100.0, 200, 0 and 400.0 mg/L in the culture medium. The effect of basic orange II on limb bud cell proliferation was detected by Cell Counting Kit-8, the effect of basic orange II on limb bud cell differentiation was assessed by Alcian Blue 8GX.

With the increasing of basic orange II concentration, the proliferation and differentiation of embryo limb bud cells were poorer and poorer in vitro, and there was the dose-effect relationship. The pID50 and dLD50 of basic orange II on limb bud cells were 240.6 mg/L and 69.3 mg/L respectively. The inhibition of basic orange II on cell differentiation might exceed that on cell proliferation.

Basic orange II could inhibit proliferation and differentiation of embryo limb bud cells. It might be a potential developmental toxic substance in rat embryo.