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- W2095663005 abstract "Although big mitogen-activated protein kinase 1 (BMK1) has been shown to be critical for embryonic angiogenesis, the role of BMK1 in tumor-associated neovascularization is poorly understood. Exogenous tumors were established in BMK1+/+, BMK1flox/+, or BMK1flox/flox mice carrying the Mx1-Cre transgene. Induced deletion of host BMK1 gene significantly reduced the volumes of B16F10 and LL/2 tumor xenografts in BMK1flox/flox mice by 63% and 72%, respectively. Examining the tumors in these induced BMK1-knockout animals showed a significant decrease in vascular density. Localized reexpression of BMK1 in BMK1-knockout mice by administration of adenovirus encoding BMK1 restored tumor growth and angiogenesis to the levels observed in wild-type mice. These observations were further supported by in vivo Matrigel plug assays in which vascular endothelial growth factor- and basic fibroblast growth factor-induced neovacularization was impaired by removing BMK1. Through screening with the Pepchip microarray, we discovered that in BMK1-knockout endothelial cells, phosphorylation of ribosomal protein S6 (rpS6) at Ser235/236 was mostly abrogated, and this BMK1-dependent phosphorylation required the activity of p90 ribosomal S6 kinase (RSK). Immunofluorescent analysis of tumor vasculature from BMK1-knockout and control animals revealed a strong correlation between the presence of BMK1 and the phosphorylation of rpS6 in tumor-associated endothelial cells of blood vessels. As both RSK and rpS6 are known to be important for cell proliferation and survival, which are critical endothelial cell functions during neovascularization, these findings suggest that the BMK1 pathway is crucial for tumor-associated angiogenesis through its role in the regulation of the RSK-rpS6 signaling module." @default.
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- W2095663005 date "2005-09-01" @default.
- W2095663005 modified "2023-10-18" @default.
- W2095663005 title "Big Mitogen-Activated Protein Kinase 1/Extracellular Signal-Regulated Kinase 5 Signaling Pathway Is Essential for Tumor-Associated Angiogenesis" @default.
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- W2095663005 doi "https://doi.org/10.1158/0008-5472.can-04-4540" @default.
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