title: Upregulation of thrombospondin-1 and angiogenesis in an aggressive human pancreatic cancer cell line selected for high metastasis.
abstract: Pancreatic cancer remains a leading cause of death despite its relatively low incidence. As in many other solid tumors, angiogenesis is critical to the growth and metastasis of this cancer. Through serial in vivo passages in mice, we have developed a highly aggressive variant of human pancreatic cancer cell line XPA-1 which shows more rapid primary tumor growth, faster time to metastasis, and more rapid lethality than the parental cell line. The high-metastatic variant developed a much denser tumor vasculature early during growth within the pancreas. Interestingly, examination of the in vitro growth of this aggressive variant yielded no significant difference from the parental cell line. Real-time PCR evaluation of genes involved in angiogenesis revealed a 24-fold increase in Thrombospondin-1 expression in cells derived from the high-metastatic variant when compared with the parental cell line. These findings provide direct evidence that elevated capability for angiogenesis, mediated by specific changes in gene expression, can lead to a large increase in cancer aggressiveness and resulting metastasis. These findings have important implications for the treatment of metastatic disease.
authors: Department of Surgery, University of California, San Diego, CA, USA.
authors: Michele K
authors: MK
authors: McElroy
authors: Sharmeela
authors: S
authors: Kaushal
authors: Hop S
authors: HS
authors: Tran Cao
authors: A R
authors: AR
authors: Moossa
authors: Mark A
authors: MA
authors: Talamini
authors: Robert M
authors: RM
authors: Hoffman
authors: Michael
authors: M
authors: Bouvet
mesh_terms: D000818:Animals; D001201:Ascites / Q000209:etiology / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D005260:Female; D020869:Gene Expression Profiling; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D008822:Mice, Transgenic; D009362:Neoplasm Metastasis; D009389:Neovascularization, Pathologic / Q000378:metabolism*; D020411:Oligonucleotide Array Sequence Analysis; D010190:Pancreatic Neoplasms / Q000098:blood supply* / Q000378:metabolism / Q000473:pathology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D019700:Thrombospondin 1 / Q000235:genetics / Q000378:metabolism*; D015854:Up-Regulation; D023041:Xenograft Model Antitumor Assays
chemical_list: D012333:RNA, Messenger; D019700:Thrombospondin 1