{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T04:30:11Z","timestamp":1791261011942,"version":"4.1.0"},"reference-count":50,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2005,2,3]],"date-time":"2005-02-03T00:00:00Z","timestamp":1107388800000},"content-version":"vor","delay-in-days":3566,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Developmental Dynamics"],"published-print":{"date-parts":[[1995,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We report the detailed developmental expression profiles of three endothelial specific receptor tyrosine kinases (RTKs) <jats:italic>flk<\/jats:italic>\u2010<jats:italic>1, tek, tie<\/jats:italic>, as well as vascular endothelial growth factor (VEGF), the <jats:italic>flk<\/jats:italic>\u2010<jats:italic>1<\/jats:italic> ligand. We also examined the expression of the other VEGF receptor, <jats:italic>flt<\/jats:italic>\u2010<jats:italic>1<\/jats:italic>, during placental development.<jats:italic>flk<\/jats:italic>\u2010<jats:italic>1, tek<\/jats:italic>, and <jats:italic>tie<\/jats:italic> transcripts were detected sequentially at one\u2010half day intervals starting at E7.0, suggesting that each of these RTKs play a unique role during vascularization of the mouse embryo. All three RTKs were expressed in the extraembryonic and embryonic mesoderm in regions that eventually give rise to the vasculature. Except for the expression of <jats:italic>tek<\/jats:italic> and <jats:italic>flk<\/jats:italic>\u2010<jats:italic>1<\/jats:italic> in the mesoderm of the amnion, the expression of these RTKs from E8.5 onwards was virtually indistinguishable. An abundant amount of <jats:italic>flt<\/jats:italic>\u2010<jats:italic>1<\/jats:italic> transcripts was found in the spongiotrophoblast cells of the developing placenta from E8.0 onwards. This cellular compartment is located between the maternal and labyrinthine layers of the placenta, which both express VEGF. VEGF transcripts were detected as early as E7.0 in the endoderm juxtaposed to the <jats:italic>flk<\/jats:italic>\u2010<jats:italic>1<\/jats:italic> positive mesoderm, and later in development VEGF expression displayed an expression profile both contiguous with that of <jats:italic>flk<\/jats:italic>\u2010<jats:italic>;1<\/jats:italic>, and also in tissues found some distance from the <jats:italic>flk<\/jats:italic>\u2010<jats:italic>1<\/jats:italic>\u2010expressing endothelium. These results suggest a possible dual role for VEGF which includes a chemotactic and\/or a cellular maintenance role for VEGF during vascularization of the mouse embryo. \u00a91995 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/aja.1002030109","type":"journal-article","created":{"date-parts":[[2005,2,26]],"date-time":"2005-02-26T21:07:39Z","timestamp":1109452059000},"page":"80-92","source":"Crossref","is-referenced-by-count":438,"title":["Vascularization of the mouse embryo: A study of <i>flk\u20101, tek, tie<\/i>, and vascular endothelial growth factor expression during development"],"prefix":"10.1002","volume":"203","author":[{"given":"Daniel J.","family":"Dumont","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guo\u2010Hua","family":"Fong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mira C.","family":"Puri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G\u00e9rard","family":"Gradwohl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kari","family":"Alitalo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin L.","family":"Breitman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,2,3]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0304-419X(90)90014-R"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1242\/dev.114.2.521"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.3109\/03008208909023875"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1095\/biolreprod48.5.1120"},{"key":"e_1_2_1_6_1","doi-asserted-by":"crossref","first-page":"735","DOI":"10.1242\/dev.102.4.735","article-title":"Embryonic vascular development: Immunohistochemical identification of the origin and subsequent morphogenesis of the major vessel primordia in quail embryos","volume":"102","author":"Coffin J. 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