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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 
 

Role of the Src homology 2 domain-containing protein Shb in murine brain endothelial cell proliferation and differentiation.

To study the role of the Src homology 2 (SH2) domain-containing protein Shb in angiogenesis, wild-type Shb and SH2 domain-mutated Shb (R522K Shb) were overexpressed in murine immortalized brain endothelial cells. The wild-type Shb cells exhibited an increased rate of apoptosis on serum withdrawal. Both wild-type Shb and R522K Shb cells exhibited enhanced spreading concomitant with cytoskeletal rearrangements that occurred independently of fibroblast growth factor (FGF)-2 stimulation. However, these effects may partly be caused by altered regulation of Rac1 and Rap1 activation in the Shb cells. The Shb-induced cytoskeletal rearrangements were not dependent on phosphatidylinositol 3' kinase activity, but could be reversed by inhibition of Src family kinases. FGF-2 failed to further enhance migration of wild-type Shb and R522K Shb cells. The R522K Shb cells cultured in collagen gels exhibit diminished tubular morphogenesis when treated with FGF-2, implicating the need for a functional Shb molecule in this process. These data suggest that Shb plays a role in the proliferation and differentiation of endothelial cells and, hence, participates in angiogenesis.[1]

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