Overexpression of a constitutively active MAP2K1 construct compensates for a reduction in kdrl and kdr expression and partially rescues angiogenic defects in ets1?/?; etv2 MO embryos. (A) qPCR analysis of endothelial genes cdh5, kdrl and kdr in whole embryos at 32 hpf. Note the reduction in kdrl and kdr expression in ets1?/?; etv2?/?embryos compared to etv2?/?embryos (B-F?) Confocal images of 28 hpf Tg(kdrl:GFP) wildtype, ets1?/?, etv2 MO (0.25 ?ng), ets1?/?; etv2 MO (0.25 ?ng) and ets1?/?; etv2 MO; fli1aep:mCh-actMAP2K1 embryos. Note the mild angiogenic defects in etv2 MO (0.25 ?ng) embryos (D) and more severe defects in ets1?/?; etv2 MO embryos(E). (F-F?) Split images showing vascular GFP expression (F), mCherry expression from the actMAP2K1 construct (F?) and a merged image with GFP and mCherry (F?). (G) Quantification of ISVs in embryos from B-F. Note the increase in the number of ISVs in ets1?/?; etv2 MO; fli1aep:mCh-actMAP2K1 embryos compared to the ets1?/?; etv2 MO embryos. ?P ?< ?0.05, ??P ?< ?0.01; n.s ? not significant; columns and horizontal bars in dotplots represent mean, error bars represent ?± ?SEM.
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