Ribonuclease inhibitor regulates neovascularization by human angiogenin.
Article Details
- CitationCopy to clipboard
Dickson KA, Kang DK, Kwon YS, Kim JC, Leland PA, Kim BM, Chang SI, Raines RT
Ribonuclease inhibitor regulates neovascularization by human angiogenin.
Biochemistry. 2009 May 12;48(18):3804-6. doi: 10.1021/bi9005094.
- PubMed ID
- 19354288 [ View in PubMed]
- Abstract
Human angiogenin (ANG) is a homologue of bovine pancreatic ribonuclease (RNase A) that induces neovascularization. ANG is the only human angiogenic factor that possesses ribonucleolytic activity. To stimulate blood vessel growth, ANG must be transported to the nucleus and must retain its catalytic activity. Like other mammalian homologues of RNase A, ANG forms a femtomolar complex with the cytosolic ribonuclease inhibitor protein (RI). To determine whether RI affects ANG-induced angiogenesis, we created G85R/G86R ANG, which possesses 10(6)-fold lower affinity for RI but retains wild-type ribonucleolytic activity. The neovascularization of rabbit corneas by G85R/G86R ANG was more pronounced and more rapid than by wild-type ANG. These findings provide the first direct evidence that RI serves to regulate the biological activity of ANG in vivo.