title: Inhibition of Ovarian Tumor Growth by Targeting the HU177 Cryptic Collagen Epitope.
abstract: Evidence suggests that stromal cells play critical roles in tumor growth. Uncovering new mechanisms that control stromal cell behavior and their accumulation within tumors may lead to development of more effective treatments. We provide evidence that the HU177 cryptic collagen epitope is selectively generated within human ovarian carcinomas and this collagen epitope plays a role in SKOV-3 ovarian tumor growth in vivo. The ability of the HU177 epitope to regulate SKOV-3 tumor growth depends in part on its ability to modulate stromal cell behavior because targeting this epitope inhibited angiogenesis and, surprisingly, the accumulation of α-smooth muscle actin-expressing stromal cells. Integrin α10β1 can serve as a receptor for the HU177 epitope in α-smooth muscle actin-expressing stromal cells and subsequently regulates Erk-dependent migration. These findings are consistent with a mechanism by which the generation of the HU177 collagen epitope provides a previously unrecognized α10β1 ligand that selectively governs angiogenesis and the accumulation of stromal cells, which in turn secrete protumorigenic factors that contribute to ovarian tumor growth. Our findings provide a new mechanistic understanding into the roles by which the HU177 epitope regulates ovarian tumor growth and provide new insight into the clinical results from a phase 1 human clinical study of the monoclonal antibody D93/TRC093 in patients with advanced malignant tumors.
authors.affiliation: Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, Maine.
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Caron
authors.affiliation: Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, Maine.
authors.forename: Jacquelyn J
authors.initials: JJ
authors.lastname: Ames
authors.affiliation: Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, Maine.
authors.forename: Liangru
authors.initials: L
authors.lastname: Contois
authors.affiliation: Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, Maine.
authors.forename: Leonard
authors.initials: L
authors.lastname: Liebes
authors.affiliation: Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, Maine.
authors.forename: Robert
authors.initials: R
authors.lastname: Friesel
authors.affiliation: New York University Langone Medical Center, Division of Hematology and Medical Oncology, New York, New York.
authors.forename: Franco
authors.initials: F
authors.lastname: Muggia
authors.affiliation: Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, Maine.
authors.forename: Calvin P H
authors.initials: CP
authors.lastname: Vary
authors.affiliation: Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, Maine.
authors.forename: Leif
authors.initials: L
authors.lastname: Oxburgh
authors.affiliation: Maine Medical Center Research Institute, Center for Molecular Medicine, Scarborough, Maine. Electronic address: brookp1@mmc.org.
authors.forename: Peter C
authors.initials: PC
authors.lastname: Brooks
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002448:Cell Adhesion / Q000502:physiology; D049109:Cell Proliferation / Q000502:physiology; D003094:Collagen / Q000737:chemistry / Q000378:metabolism*; D000939:Epitopes; D005260:Female; D064593:Heterografts; D006801:Humans; D051379:Mice; D009389:Neovascularization, Pathologic / Q000378:metabolism; D010051:Ovarian Neoplasms / Q000378:metabolism / Q000473:pathology*; D059016:Tumor Microenvironment / Q000502:physiology*
chemical_list: D000939:Epitopes; D003094:Collagen