Journal
PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES
Volume 87, Issue 4, Pages 167-178Publisher
JAPAN ACAD
DOI: 10.2183/pjab.87.167
Keywords
tyrosine kinase; angiogenesis; sFlt-1; natural VEGF-inhibitor; hypertension
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [17014020]
- Grants-in-Aid for Scientific Research [17014020] Funding Source: KAKEN
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We previously isolated a novel tyrosine kinase receptor, Flt-1, now known as VEGF-receptor (VEGFR)-1. The VEGF VEGFR, system plays a pivotal role in not only physiological but also pathological angiogenesis. We examined the role of Flt-1 in carcinogenesis using Flt-1-signal-deficient (Flt-1 TK-/-) mice, and found that this receptor stimulates tumor growth and metastasis most likely via macrophages, making it an important potential target in the treatment of cancer. In addition to the full-length receptor, the Flt-1 gene produces a soluble protein, sFlt-1, an endogenous VEGF-inhibitor. sFlt-1 is expressed in trophoblasts of the placenta between fetal and maternal blood vessels, suggesting it to be a barrier against extreme VEGF-signaling. Abnormally high expression of sFlt-1 occurs in most preeclampsia patients, whose main symptoms are hypertension and proteinurea. In cancer patients, strong suppression of VEGF VEGFR by drugs induces similar side effects including hypertension. These results indicate a close relationship between abnormal VEGF-block and hypertension/proteinurea,. sFlt-1 is an attractive target for the control of preeclampsia.
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