The antiangiogenic agent TNP-470 requires p53 and p21CIP/WAF for endothelial cell growth arrest.
basic_science · Level V
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- Record sourced from PubMed, PMID 11070090.
- Also identified by PMC identifier 18841.
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Abstract
Targeting the endothelial cell cycle as an antiangiogenic strategy has been difficult given the ubiquitous expression of critical cell cycle regulators. Here, we show that the antiangiogenic drug TNP-470 displays striking cell-type specificity insofar as it induces the expression of p21(CIP/WAF), a cyclin-dependent kinase inhibitor, in endothelial cells but not in embryonic or adult fibroblasts. Moreover, primary endothelial cells isolated from p53(-/-) and p21(CIP/WAF-/-) mice are resistant to the cytostatic activity of TNP-470. We also demonstrate that p21(CIP/WAF-/-) mice are resistant to the antiangiogenic activity of TNP-470 in the basic fibroblast growth factor corneal micropocket angiogenesis assay. We conclude that TNP-470 induces p53 activation through a unique mechanism in endothelial cells leading to p21(CIP/WAF) expression and subsequent growth arrest.
Medical subject headings
- Angiogenesis Inhibitors
- Cyclin-Dependent Kinases
- Cyclins
- Nuclear Proteins
- Sesquiterpenes
- Tumor Suppressor Protein p53