title: Angiopoietin-like 4 is a proangiogenic factor produced during ischemia and in conventional renal cell carcinoma.
abstract: Ischemic and solid tumor tissues are less well perfused than normal tissue, leading to metabolic changes and chronic hypoxia, which in turn promotes angiogenesis. We identified human angiopoietin-like 4 (angptl4) as a gene with hypoxia-induced expression in endothelial cells. We showed that the levels of both mRNA and protein for ANGPTL4 increased in response to hypoxia. When tested in the chicken chorioallantoic membrane assay, ANGPTL4 induced a strong proangiogenic response, independently of vascular endothelial growth factor. In human pathology, ANGPTL4 mRNA is produced in ischemic tissues, in conditions such as critical leg ischemia. In tumors, ANGPTL4 is produced in the hypoxic areas surrounding necrotic regions. We observed particularly high levels of ANGPTL4 mRNA in tumor cells of conventional renal cell carcinoma. Other benign and malignant renal tumor cells do not produce ANGPTL4 mRNA. This molecule therefore seems to be a marker of conventional renal cell carcinoma. ANGPTL4, originally identified as a peroxisome proliferator-activated receptor alpha and gamma target gene, has potential for use as a new diagnostic tool and a potential therapeutic target, modulating angiogenesis both in tumors and in ischemic tissues. This study also suggests that ANGPTL4 may provide a link between metabolic disorders and hypoxia-induced angiogenesis.
authors.affiliation: INSERM U36, Collège de France, Paris.
authors.forename: Sébastien
authors.initials: S
authors.lastname: Le Jan
authors.forename: Céline
authors.initials: C
authors.lastname: Amy
authors.forename: Aurélie
authors.initials: A
authors.lastname: Cazes
authors.forename: Catherine
authors.initials: C
authors.lastname: Monnot
authors.forename: Noël
authors.initials: N
authors.lastname: Lamandé
authors.forename: Judith
authors.initials: J
authors.lastname: Favier
authors.forename: Josette
authors.initials: J
authors.lastname: Philippe
authors.forename: Mathilde
authors.initials: M
authors.lastname: Sibony
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Gasc
authors.forename: Pierre
authors.initials: P
authors.lastname: Corvol
authors.forename: Stéphane
authors.initials: S
authors.lastname: Germain
mesh_terms: D000075803:Angiopoietin-Like Protein 4; D042682:Angiopoietins; D002292:Carcinoma, Renal Cell / Q000098:blood supply / Q000235:genetics* / Q000473:pathology; D002460:Cell Line; D004730:Endothelium, Vascular / Q000166:cytology / Q000502:physiology*; D005786:Gene Expression Regulation / Q000502:physiology; D006801:Humans; D000860:Hypoxia / Q000235:genetics / Q000473:pathology; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics*; D007511:Ischemia / Q000235:genetics* / Q000473:pathology; D007680:Kidney Neoplasms / Q000098:blood supply / Q000235:genetics* / Q000473:pathology; D009389:Neovascularization, Pathologic / Q000235:genetics*; D014407:Tumor Cells, Cultured
chemical_list: C474772:ANGPTL4 protein, human; D000075803:Angiopoietin-Like Protein 4; D042682:Angiopoietins; D036341:Intercellular Signaling Peptides and Proteins