title: A novel strategy for the generation of angiostatic kringle regions from a precursor derived from plasminogen.
abstract: In this study we have explored the feasibility of generating angiostatin by incorporating an endoproteolytic furin cleavage site into plasminogen to allow conversion of the precursor molecule into an angiostatic active K1-3 fragment. We show that secretable angiostatin can be successfully generated from cells infected with adenovirus carrying the furin-mutated plasminogen (AdmuthPlgK3). Supernatant from cells transduced with AdmuthPlagK3 inhibits tube formation and proliferation and migration of human umbilical vein endothelial cells with an efficiency similar to that of supernatant from cells infected with adenovirus expressing kringle 1-3 of plasminogen (AdK1-3). Administration of AdmuthPlgK3 and AdK1-3 in mice results in significantly decreased endothelial cell infiltration in VEGF-embedded Matrigel plugs. Treatment with AdmuthPlgK3 and AdK1-3 exerts strong antitumoral effect in models of hepatocellular carcinoma and Lewis lung cancer. This antitumor effect was associated with decreased microvessel density in the tumors. Taken together, our data demonstrate that angiostatin endowed with strong antiangiogenic and antitumor effects can be released from a furin-mutated plasminogen acting as a precursor. This strategy may have potential to develop angiostatic anti-cancer therapies.
authors.affiliation: Division of Hepatology and Gene Therapy, Department of Medicine, Medical School, University of Navarra, Pamplona, Spain.
authors.forename: V
authors.initials: V
authors.lastname: Schmitz
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: M
authors.initials: M
authors.lastname: Barajas
authors.forename: D
authors.initials: D
authors.lastname: Peng
authors.forename: J
authors.initials: J
authors.lastname: Prieto
authors.forename: C
authors.initials: C
authors.lastname: Qian
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000595:Amino Acid Sequence; D043168:Angiostatins; D000818:Animals; D001483:Base Sequence; D015316:Genetic Therapy / Q000379:methods*; D005822:Genetic Vectors; D006801:Humans; D018082:Kringles / Q000235:genetics*; D008114:Liver Neoplasms, Experimental / Q000098:blood supply / Q000628:therapy; D008175:Lung Neoplasms / Q000098:blood supply / Q000628:therapy; D051379:Mice; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D008969:Molecular Sequence Data; D009374:Neoplasms, Experimental / Q000098:blood supply* / Q000628:therapy; D009389:Neovascularization, Pathologic / Q000517:prevention & control*; D010446:Peptide Fragments / Q000096:biosynthesis / Q000235:genetics*; D010958:Plasminogen / Q000096:biosynthesis / Q000235:genetics*; D014407:Tumor Cells, Cultured
chemical_list: D010446:Peptide Fragments; D043168:Angiostatins; D010958:Plasminogen