For example, Rac is required for shear stress-induced matrix metalloproteinase 9 (MMP9) expression in chondrocytes [ 44], and activated Rac can induce expression of the MMP1 in fibroblasts [ 45].
For example, both Rac and Cdc42 can activate Arp2/3 to result in actin polymerization.
For example, the Rac activator Tiam1 forms a complex with Par proteins.
One implication from these observations is that the impact from loss of protein geranylgeranylation on cell viability is more severe than loss of farnesylation, highlighting the critical involvement of one or more geranylgeranylated proteins, for example, Rho, Rac and Cdc42, in the growth and survival of transformed cells.
Rac-GEFs from the Vav family, for example, are nonresponsive to NSC23766 (Gao et al., 2004) and known to be required for neutrophil spreading (Lawson et al., 2011).
For example Tiam-1, a Rac specific RhoGEF that is activated by Ras.GTP through its RBD [37] and SOS, the key Ras-GEF that is also regulated by Ras.GTP as well as coupled to Rac1 activation [38].
Excellent conversions were achieved for both substrates; for example, the deracemization of rac- 1 b reached near-completion within 24 h (Table 2).
Exacerbated inputs from pathways required for the activation of Rac-GEFs, such as PI3K or receptors that are coupled to PI3K activation (for example HER2/ErbB2 or PDGF receptors), also confer Rac hyperactivation [ 3, 6, 22, 23].
For example, the main properties of RAC that are affected unfavourably by the attached mortar content are its density, absorption and Los Angeles abrasion, as well as the correlations between them and the attached mortar content (Juan and Gutierrez 2009).
For example, cells with overexpressed constitutively active Rac had elevated levels of PIP3 production, and treatment with Latrunculin A (LatA), an inhibitor for actin polymerization, led to an inhibition of the Rac-induced PIP3 production.
