title: Metastasis-associated gene expression profile of liver and subcutaneous lesions derived from mouse pheochromocytoma cells.
abstract: The development of metastatic cancer is associated with overexpression or downregulation of specific genes and cell regulatory pathways. Some of these genes and pathways may be involved in invasion and dissemination of tumor cells, while others may promote seeding, survival or growth of cells at specific distant sites. In this investigation, gene expression profiles of nonmetastasizing tumors generated by injecting mouse pheochromocytoma cells (MPCs) subcutaneously were compared to those of liver tumors generated by injecting the cells intravenously. Both were compared to the cultured parental cell line. Tumors in the liver have a route of spread, anatomical distribution, and growth environment similar to naturally metastasizing pheochromocytomas, while intravenous injection of cells bypasses the initial steps of metastasis occurring spontaneously from a primary tumor. Eight genes were upregulated in liver tumors, 15 in subcutaneous tumors and seven in both compared to the cultured cells. Using quantitative real-time PCR, expression of five genes (Metap2, Reck, S100a4, Timp2, and Timp3) was verified as significantly lower in liver tumors than in subcutaneous tumors. Downregulation of these genes has been previously been associated with malignancy of pheochromocytomas. These findings indicate that different microenvironments can differentially affect the expression of metastasis-related genes in pheochromocytomas, and that overexpression or underexpression of these genes need not be present when the tumor cells are initially disseminated. The hepatic localization of tumors formed by intravenously injected MPC cells and the tumors' gene expression profile resembling that of naturally occurring pheochromocytoma metastases support the use of this model to study pheochromocytoma metastasis.
authors.affiliation: Reproductive Biology and Medicine Branch, National Institute of Child Health and Human Development, Bethesda, Maryland 20892-1109, USA.
authors.forename: Shoichiro
authors.initials: S
authors.lastname: Ohta
authors.forename: Edwin W
authors.initials: EW
authors.lastname: Lai
authors.forename: John C
authors.initials: JC
authors.lastname: Morris
authors.forename: Alan L Y
authors.initials: AL
authors.lastname: Pang
authors.forename: Morihiro
authors.initials: M
authors.lastname: Watanabe
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yazawa
authors.forename: Richard
authors.initials: R
authors.lastname: Zhang
authors.forename: Jeffery E
authors.initials: JE
authors.lastname: Green
authors.forename: Wai-Yee
authors.initials: WY
authors.lastname: Chan
authors.forename: Paul
authors.initials: P
authors.lastname: Sirajuddin
authors.forename: Shun'ichiro
authors.initials: S
authors.lastname: Taniguchi
authors.forename: James F
authors.initials: JF
authors.lastname: Powers
authors.forename: Arthur S
authors.initials: AS
authors.lastname: Tischler
authors.forename: Karel
authors.initials: K
authors.lastname: Pacak
mesh_terms: D000310:Adrenal Gland Neoplasms / Q000235:genetics* / Q000473:pathology / Q000556:secondary; D000818:Animals; D045744:Cell Line, Tumor; D005260:Female; D020869:Gene Expression Profiling; D008114:Liver Neoplasms, Experimental / Q000235:genetics / Q000473:pathology / Q000556:secondary*; D051379:Mice; D008819:Mice, Nude; D008822:Mice, Transgenic; D010673:Pheochromocytoma / Q000235:genetics* / Q000473:pathology / Q000556:secondary*; D040521:Subcutaneous Tissue / Q000473:pathology*