Title : Aryl hydrocarbon receptor 2 mediates 2,3,7,8-tetrachlorodibenzo-p-dioxin developmental toxicity in zebrafish.

Pub. Date : 2003 Nov

PMID : 12883077






7 Functional Relationships(s)
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1 Aryl hydrocarbon receptor 2 mediates 2,3,7,8-tetrachlorodibenzo-p-dioxin developmental toxicity in zebrafish. Polychlorinated Dibenzodioxins aryl hydrocarbon receptor 2 Danio rerio
2 In order to use the zebrafish as a model vertebrate to investigate the developmental toxicity of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), it is essential to know whether one or both forms of the zebrafish aryl hydrocarbon receptor (AHR), zfAHR1 or zfAHR2, mediate toxicity. Polychlorinated Dibenzodioxins aryl hydrocarbon receptor 2 Danio rerio
3 Injection of embryos at the 1-2 cell stage with zfahr2-MO decreased TCDD-induced transcription of zfCYP1A mRNA until 96 h post fertilization (hpf), and immuno-histochemical detection of zfCYP1A protein in embryos at 72 hpf revealed a dramatic decrease in expression. Polychlorinated Dibenzodioxins aryl hydrocarbon receptor 2 Danio rerio
4 The zfahr2-MO completely protected embryos from TCDD-induced edema and anemia and provided protection against TCDD-induced reductions in peripheral blood flow initially; however, a slight reduction in blood flow was observed at later times when the morpholino was no longer effective. Polychlorinated Dibenzodioxins aryl hydrocarbon receptor 2 Danio rerio
5 The zfahr2-MO completely protected embryos from TCDD-induced edema and anemia and provided protection against TCDD-induced reductions in peripheral blood flow initially; however, a slight reduction in blood flow was observed at later times when the morpholino was no longer effective. Polychlorinated Dibenzodioxins aryl hydrocarbon receptor 2 Danio rerio
6 Endpoints of TCDD developmental toxicity manifested in zfahr2 morphants at late stages of development, beyond 144 hpf, were clearly different from TCDD-exposed embryos injected with a control morpholino. Polychlorinated Dibenzodioxins aryl hydrocarbon receptor 2 Danio rerio
7 Most strikingly, zfahr2 morphants exposed to TCDD never developed edema. Polychlorinated Dibenzodioxins aryl hydrocarbon receptor 2 Danio rerio