タキタ　モリチカ   Takita Morichika   瀧田　守親    所属   医学部 医学科    職種   助教
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Direct Melanoma Cell Contact Induces Stromal Cell Autocrine Prostaglandin E2-EP4 Receptor Signaling That Drives Tumor Growth, Angiogenesis, and Metastasis.
掲載誌名	正式名：Journal of Biological Chemistry 略　 称：J. Biol. Chem. ISSNコード：1083351X
掲載区分	国外
巻・号・頁	290,pp.29781-29793
著者・共著者	Inada Masaki†, Morichika Takita, Yokoyama Satoshi, Tominari Tsukasa, Matsumoto Chiho, Hirata Michiko, Maru Yoshiro, Maruyama Takayuki, Sugimoto Yukihiko, Narumiya Shu, Uematsu Satoshi, Akira Shizuo, Gillian Murphy, Nagase Hideaki, Miyaura Chisato*
担当区分	2nd著者
発行年月	2015/10
概要	The stromal cells associated with tumors such as melanoma are significant determinants of tumor growth and metastasis. Using membrane-bound prostaglandin E synthase 1 (mPges1(-/-)) mice, we show that prostaglandin E2 (PGE2) production by host tissues is critical for B16 melanoma growth, angiogenesis, and metastasis to both bone and soft tissues. Concomitant studies in vitro showed that PGE2 production by fibroblasts is regulated by direct interaction with B16 cells. Autocrine activity of PGE2 further regulates the production of angiogenic factors by fibroblasts, which are key to the vascularization of both primary and metastatic tumor growth. Similarly, cell-cell interactions between B16 cells and host osteoblasts modulate mPGES-1 activity and PGE2 production by the osteoblasts. PGE2, in turn, acts to stimulate receptor activator of NF-κB ligand expression, leading to osteoclast differentiation and bone erosion. Using eicosanoid receptor antagonists, we show that PGE2 acts on osteoblasts and fibroblasts in the tumor microenvironment through the EP4 receptor. Metastatic tumor growth and vascularization in soft tissues was abrogated by an EP4 receptor antagonist. EP4-null Ptger4(-/-) mice do not support B16 melanoma growth. In vitro, an EP4 receptor antagonist modulated PGE2 effects on fibroblast production of angiogenic factors. Our data show that B16 melanoma cells directly influence host stromal cells to generate PGE2 signals governing neoangiogenesis and metastatic growth in bone via osteoclast erosive activity as well as angiogenesis in soft tissue tumors.
DOI	10.1074/jbc.M115.669481
PMID	26475855