Article: article from journal or magazin.
Thrombospondin-1 is downregulated by anoxia and suppresses tumorigenicity of human glioblastoma cells.
The Journal of Experimental Medicine
Publication types: Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, P.H.S. Publication Status: ppublish
Angiogenesis, the sprouting of new capillaries from preexisting blood vessels, results from a disruption of the balance between stimulatory and inhibitory factors. Here, we show that anoxia reduces expression of thrombospondin-1 (TSP-1), a natural inhibitor of angiogenesis, in glioblastoma cells. This suggests that reduced oxygen tension can promote angiogenesis not only by stimulating the production of inducers, such as vascular endothelial growth factor, but also by reducing the production of inhibitors. This downregulation may significantly contribute to glioblastoma development, since we show that an increase in TSP-1 expression is sufficient to strongly suppress glioblastoma cell tumorigenicity in vivo.
Animals, Anoxia/genetics, Anoxia/physiopathology, Base Sequence, DNA Primers/genetics, Down-Regulation, Genes, p53, Glioblastoma/blood supply, Glioblastoma/genetics, Humans, Male, Mice, Mice, Nude, Neoplasm Transplantation, Neovascularization, Pathologic/genetics, RNA, Messenger/genetics, RNA, Messenger/metabolism, RNA, Neoplasm/genetics, RNA, Neoplasm/metabolism, Thrombospondin 1/biosynthesis, Thrombospondin 1/genetics, Transplantation, Heterologous, Tumor Cells, Cultured
Web of science
Last modification date