Tissue factor (TF) is crucial for embryogenesis, as mice lacking TF are embryonically lethal (E10.5). This lethality may be attributed to defects in vascular development and circulatory failure, suggesting additional roles for TF in embryonic development beyond coagulation. In this study, we characterized the role of one of the TF paralogs () using a zebrafish model. The expression of during embryonic developmental stages was determined by RT-PCR. Spatiotemporal expression pattern of revealed (high expression from 28 to 36 hpf) the role of in the development of the yolk sac, circulation, and fins. Morpholinos (MO), an antisense-based oligonucleotide strategy, was used to knockdown and examined for defects in morphological appearance, bleeding, and vascular patterning. MO-injected embryos showed morphological abnormalities, including shorter body lengths and crooked tails. O-dianisidine staining showed MO-injected embryos exhibited bleeding in the trunk (5.44%) and head (9.52%) regions. Imaging of endothelial-specific transgenic lines () showed a 3-fold decreased caudal vein plexus (CVP) in morphants versus controls at 48 hpf, suggesting a potential role for in angiogenesis. These findings confirm that is essential for angiogenesis, in addition to its involvement in hemostasis.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8978257PMC
http://dx.doi.org/10.3389/fcell.2022.852989DOI Listing

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