Generation of inhibitory DNA aptamers against human hepatocyte growth factor.
Hepatocyte growth factor (HGF), a multifunctional cytokine, can act on many cell types. It is involved in cancer growth and metastasis by enhancing the motility of cancer cells and stimulating angiogenesis. The development of effective inhibitors for HGF is an important issue in cancer therapy. In this study, we isolated DNA aptamers against human HGF using the systematic evolution of ligands by exponential enrichment method. The selected DNA aptamers had a highly conserved consensus sequence, and could be divided into two major classes (classes I and II). The consensus motif of classes I and II might contribute to the formation of a hairpin loop structure and a G-quartet structure, respectively. These DNA aptamers bound to human HGF with high affinity and specificity. The dissociation constants of typical aptamers H38-15 and H38-21, representative of the two classes, were calculated to be approximately 20 nM. H38-15 and H38-21 inhibited the biological activities of HGF including the stimulation of scattering, migration, and invasion of pancreatic cancer KP-3 cells. Furthermore, both aptamers inhibited HGF-induced tube formation by human umbilical vein endothelial cells. These results suggested that the isolated DNA aptamers will be useful as therapeutic and diagnostic reagents for cancers.
Saito
Takeshi
T
Saitama Cancer Center Research Institute, 818 Komuro, Ina, Saitama, Japan.
Tomida
Mikio
M
D001483:Base Sequence; D002465:Cell Movement / Q000187:drug effects*; D002478:Cells, Cultured; D004247:DNA / Q000494:pharmacology*; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D017228:Hepatocyte Growth Factor / Q000037:antagonists & inhibitors* / Q000235:genetics; D006801:Humans; D008024:Ligands; D008934:Mitogens / Q000037:antagonists & inhibitors* / Q000235:genetics; D008969:Molecular Sequence Data; D009361:Neoplasm Invasiveness; D009389:Neovascularization, Pathologic / Q000188:drug therapy; D010190:Pancreatic Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D012689:Sequence Homology, Nucleic Acid; D014471:Umbilical Veins / Q000166:cytology / Q000187:drug effects / Q000378:metabolism
C066855:HGF protein, human; D008024:Ligands; D008934:Mitogens; D017228:Hepatocyte Growth Factor; D004247:DNA