title: Tumor-derived angiogenesis factors from rat Walker 256 carcinoma: an experimental investigation and review.
abstract: Angiogenesis, the process of developing a hemovascular network, is an essential feature of the growth of solid tumors, and is induced by factors secreted by tumor cells. Assay procedures suitable for the investigation of angiogenesis, and for the screening of angiogenesis factors during purification are reviewed; and a number of reports describing the purification of angiogenesis factors, primarily from the rat Walker 256 carcinoma as starting material, are discussed. Work from the authors' laboratory is also presented. Walker 256 cells grown in large-scale culture were the source of a reproducible and homogeneous source of angiogenic material. Factors secreted by these cells were isolated by a series of chromatographic steps. Ion exchange chromatography on carboxymethyl-Sephadex produced two active fractions, one of which was fractionated into several macromolecular species by lectin affinity and hydrophobic adsorption chromatography. The other gave a high mol.wt, active fraction that was resolved into a low mol.wt, active component and a non-angiogenic but possibly carrier molecule with a mol.wt of 140,000. While none of the angiogenic factors were identified chemically, the results demonstrate the existence of both high and low mol.wt tumor-secreted angiogenic substances, confirming the hypothesis for tumor-induced angiogenesis and predicting potential means to interfere with the process of tumor growth.
authors.forename: B L
authors.initials: BL
authors.lastname: Vallee
authors.forename: J F
authors.initials: JF
authors.lastname: Riordan
authors.forename: R R
authors.initials: RR
authors.lastname: Lobb
authors.forename: N
authors.initials: N
authors.lastname: Higachi
authors.forename: J W
authors.initials: JW
authors.lastname: Fett
authors.forename: G
authors.initials: G
authors.lastname: Crossley
authors.forename: R
authors.initials: R
authors.lastname: Bühler
authors.forename: G
authors.initials: G
authors.lastname: Budzik
authors.forename: K
authors.initials: K
authors.lastname: Breddam
authors.forename: J L
authors.initials: JL
authors.lastname: Bethune
mesh_terms: D000650:Amnion / Q000098:blood supply; D043925:Angiogenesis Inducing Agents / Q000302:isolation & purification* / Q000494:pharmacology; D000818:Animals; D001681:Biological Assay; D002279:Carcinoma 256, Walker / Q000032:analysis*; D002455:Cell Division; D002478:Cells, Cultured; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002642:Chick Embryo; D002823:Chorion / Q000098:blood supply; D002845:Chromatography / Q000379:methods; D003315:Cornea / Q000098:blood supply; D004727:Endothelium / Q000166:cytology; D006133:Growth Substances / Q000302:isolation & purification*; D007525:Isoelectric Focusing; D051379:Mice; D008970:Molecular Weight; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000098:blood supply; D009389:Neovascularization, Pathologic / Q000503:physiopathology; D011817:Rabbits; D051381:Rats; D013363:Submandibular Gland / Q000032:analysis
chemical_list: D043925:Angiogenesis Inducing Agents; D006133:Growth Substances