title: Hyperproduction of hyaluronan in neu-induced mammary tumor accelerates angiogenesis through stromal cell recruitment: possible involvement of versican/PG-M.
abstract: Elevated concentrations of hyaluronan are often associated with human breast cancer malignancy. Here, we investigated the roles of hyaluronan in carcinogenesis and cancer progression using the mouse mammary tumor virus (MMTV)-Neu transgenic model of spontaneous breast cancer. Conditional transgenic mice that express murine hyaluronan synthase 2 (Has2) by Cre-mediated recombination were generated and crossed with the MMTV-Neu mice. In expressing Cre recombinase under the control of the MMTV promoter, the bigenic mice bearing Has2 and neu transgenes exhibited a deposition of hyaluronan matrix and aggressive growth of Neu-initiated mammary tumors. Notably, forced expression of Has2 impaired intercellular adhesion machinery and elicited cell survival signals in tumor cells. Concurrent with these alterations of tumor cells, intratumoral stroma and microvessels were markedly induced. To reveal the molecular basis of hyaluronan-mediated neovascularization, various hyaluronan samples were examined for their ability to potentiate in vivo angiogenesis. In Matrigel plug assays, basic fibroblast growth factor-induced neovascularization was elevated in the presence of either hyaluronan oligosaccharides or a hyaluronan aggregate containing versican. Administration of hyaluronan-versican aggregates, but not native hyaluronan alone, promoted stromal cell recruitment concurrently with the infiltration of endothelial cells. Taken together, these results suggest that hyaluronan overproduction accelerates tumor angiogenesis through stromal reaction, notably in the presence of versican.
authors.affiliation: Department of Molecular Oncology,Division of Molecular and Cellular Biology, Institute on Aging and Adaptation, Shinshu University Graduate School of Medicine, Matsumoto, Nagano, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Koyama
authors.forename: Terumasa
authors.initials: T
authors.lastname: Hibi
authors.forename: Zenzo
authors.initials: Z
authors.lastname: Isogai
authors.forename: Masahiko
authors.initials: M
authors.lastname: Yoneda
authors.forename: Minoru
authors.initials: M
authors.lastname: Fujimori
authors.forename: Jun
authors.initials: J
authors.lastname: Amano
authors.forename: Masatomo
authors.initials: M
authors.lastname: Kawakubo
authors.forename: Reiji
authors.initials: R
authors.lastname: Kannagi
authors.forename: Koji
authors.initials: K
authors.lastname: Kimata
authors.forename: Shun'ichiro
authors.initials: S
authors.lastname: Taniguchi
authors.forename: Naoki
authors.initials: N
authors.lastname: Itano
mesh_terms: D000818:Animals; D015153:Blotting, Western; D002851:Chromatography, High Pressure Liquid; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D014453:Glucuronosyltransferase / Q000235:genetics; D006801:Humans; D000076002:Hyaluronan Synthases; D006820:Hyaluronic Acid / Q000096:biosynthesis*; D015151:Immunoblotting; D007150:Immunohistochemistry; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000098:blood supply / Q000378:metabolism* / Q000473:pathology; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009389:Neovascularization, Pathologic / Q000378:metabolism* / Q000473:pathology; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017154:Stromal Cells / Q000378:metabolism*; D053675:Versicans / Q000378:metabolism*
chemical_list: D014453:Glucuronosyltransferase; D000076002:Hyaluronan Synthases; D006820:Hyaluronic Acid; D018719:Erb-b2 Receptor Tyrosine Kinases; D053675:Versicans; C491099:Has2 protein, mouse