The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
flk-1, an flt-related receptor tyrosine kinase is an early marker for endothelial cell precursors
Abstract
We have used RT-PCR to screen pluripotent murine embryonic stem cells to identify receptor tyrosine kinases (RTKs) potentially involved in the determination or differentiation of cell lineages during early mouse development. Fourteen different tyrosine kinase sequences were identified. The expression patterns of four RTKs have been examined and all are expressed in the mouse embryo during, or shortly after, gastrulation. We report here the detailed expression pattern of one such RTK, the flt-related gene flk-1. In situ hybridization analysis of the late primitive streak stage embryo revealed that flk-1 was expressed in the proximallateral embryonic mesoderm; tissue fated to become heart. By headfold stages, staining was confined to the endocardial cells of the heart primordia as well as to the blood islands of the visceral yolk sac and the developing allantois. Patchy, speckled staining was detected in the endothelium of all the major embryonic and extraembryonic blood vessels as they formed. During early organogenesis, expression was detected in the blood vessels of highly vascularized tissues such as the brain, liver, lungs and placenta. Since flk-1 was expressed in early mesodermal cells prior to any morphological evidence for endothelial cell differentiation (vasculogenesis), as well as in cells that form blood vessels from preexisting ones (angiogenesis), it appears to be a very early marker of endothelial cell precursors. We have previously reported that another novel RTK, designated tek, was expressed in differentiating endothelial cells. We show here that flk-1 transcripts are expressed one full embryonic day earlier than the first tek transcripts. The expression of these two RTKs appear to correlate with the specification and early differentiation of the endothelial cell lineage respectively, and therefore may play important roles in the establishment of this lineage.
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Metadata
- Authors
- Yamaguchi, T. P., Dumont, D. J., Conlon, R. A., Breitman, M. L., & Rossant, J.
- Venue
- Development
- Publisher
- The Company of Biologists
- Published
- 1993-06-01
- Volume
- 118
- Issue
- 2
- Pages
- 489-498
- ISSN
- 0950-1991 (ISSN-L)
- 1477-9129
- OpenAlex
- W2172264076
- Cited by
- 695
- References
- 1
- FWCI
- 7.74
- Type
- journal article
- Language
- en
- Open access
- closed
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