ACTIBIND, a T2 RNase, competes with angiogenin and inhibits human melanoma growth, angiogenesis, and metastasis.
Melanoma is a very aggressive and highly angiogenic tumor in which standard treatments have had only limited success. Patients with advanced disease have a 5-year survival rate of 5%. In search for alternatives, we identified a natural product extracted from the fungus Aspergillus niger, termed ACTIBIND, that inhibits tumor growth and metastasis of melanoma in vivo. ACTIBIND, a T2 RNase, exerts antitumorigenic and antiangiogenic activities by competing with the angiogenic factor angiogenin (itself an RNase homologue). Thus, there was decreased expression and activity of the matrix metalloproteinase 2 in melanoma and vascular endothelial cells, decreased vascularization, and increased tumor cell apoptosis in vivo. ACTIBIND significantly inhibited angiogenesis in an in vivo angiogenesis assay with sponges containing angiogenin. In vitro, ACTIBIND was internalized by both melanoma and human umbilical vein endothelial cells, reached the cell nuclei, and inhibited the activity of angiogenin response elements in a dose-dependent manner. Collectively, our data indicate that ACTIBIND should be tested for its potential as a new antiangiogenic modality for the treatment of melanoma.
Schwartz
Betty
B
The Institute of Biochemistry, Food Science, and Nutrition, Faculty of Agricultural, Food, and Environmental Quality Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel.
Shoseyov
Oded
O
Melnikova
Vladislava O
VO
McCarty
Marya
M
Leslie
Michael
M
Roiz
Levava
L
Smirnoff
Patricia
P
Hu
Guo-Fu
GF
Lev
Dina
D
Bar-Eli
Menashe
M
D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D001234:Aspergillus niger / Q000201:enzymology; D048708:Cell Growth Processes / Q000187:drug effects; D045744:Cell Line, Tumor; D004347:Drug Interactions; D004722:Endoribonucleases / Q000378:metabolism / Q000494:pharmacology*; D042783:Endothelial Cells / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D006801:Humans; D008156:Luciferases / Q000378:metabolism; D008297:Male; D020778:Matrix Metalloproteinase 2 / Q000096:biosynthesis / Q000378:metabolism; D061965:Matrix Metalloproteinase Inhibitors; D008545:Melanoma / Q000098:blood supply / Q000188:drug therapy* / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009362:Neoplasm Metastasis; D009389:Neovascularization, Pathologic / Q000188:drug therapy / Q000473:pathology; D012259:Ribonuclease, Pancreatic / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000494:pharmacology*; D014158:Transcription, Genetic
D061965:Matrix Metalloproteinase Inhibitors; D008156:Luciferases; D004722:Endoribonucleases; C046366:angiogenin; C022543:ribonuclease T(2); D012259:Ribonuclease, Pancreatic; D020778:Matrix Metalloproteinase 2