title: Engineering of human coagulation factor x variants activated by prostate-specific antigen.
abstract: In this study, we present a novel approach for the induction of tumor vessel thrombosis using genetically modified coagulation factor X. Human factor X was engineered in its activation peptide in a way that it can be specifically activated by prostate-specific antigen (PSA), a tumor-specific proteinase secreted into the bloodstream by prostate cancer cells. For this purpose we inserted different sequences of known PSA cleavage sites from the natural substrate of PSA, semenogelin I, into the activation peptide of factor X. One FX variant (FX-V4) was further optimized by site-directed mutagenesis of the P2 position and the P5 position (FX-V4-P2YP5R). After preincubation with PSA, FX-V4-P2YP5R was able to efficiently induce coagulation in vitro. These FX variants should be useful for site-specific induction of blood coagulation in the tumor vasculature.
authors.affiliation: Insitut für Molekularbiologie und Tumorforschung, Philipps- Universität, Emil-Mannkopff-Str.2, 35033 Marburg, Germany.
authors.forename: Tina
authors.initials: T
authors.lastname: Völkel
authors.forename: Hans-Heinrich
authors.initials: HH
authors.lastname: Heidtmann
authors.forename: Rolf
authors.initials: R
authors.lastname: Müller
authors.forename: Roland E
authors.initials: RE
authors.lastname: Kontermann
mesh_terms: D000818:Animals; D004789:Enzyme Activation / Q000235:genetics; D005170:Factor X / Q000235:genetics* / Q000627:therapeutic use; D006801:Humans; D008297:Male; D009389:Neovascularization, Pathologic / Q000188:drug therapy / Q000235:genetics; D017430:Prostate-Specific Antigen / Q000235:genetics* / Q000627:therapeutic use; D011471:Prostatic Neoplasms / Q000098:blood supply / Q000188:drug therapy; D015202:Protein Engineering / Q000379:methods; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000627:therapeutic use; D029607:Seminal Vesicle Secretory Proteins / Q000235:genetics* / Q000627:therapeutic use; D013927:Thrombosis / Q000139:chemically induced
chemical_list: D011993:Recombinant Fusion Proteins; D029607:Seminal Vesicle Secretory Proteins; C424482:seminal vesicle-specific antigen; D005170:Factor X; D017430:Prostate-Specific Antigen