The amplified ATP signal then activates P2X4 receptors, which mediate activation of the caspase-1 inflammatory response.
These apoptotic factors mediate activation of caspase-9 and antagonize the activity of inhibitors of apoptosis that otherwise function to suppress caspase activity.
These molecules mediate activation of many key transcription factors, such as the activator protein-1 complex, which then facilitates induction and transcription of the relevant proinflammatory genes, such as cytokines, chemokines and matrix metalloproteinases [ 12].
PDK1 was first identified as a key activator of PKB, but was also found to mediate activation of other AGC kinases such as RSK and S6K1 (Biondi et al, 2000, 2001; Frodin et al, 2000, 2002).
It is known that Nox4 activity plays an important role in specific signal transduction processes which can modulate cell proliferation, such as signalling through ERK1/2 [ 24] and stress-activated kinase p38 [ 25], whereas Nox1 is known to mediate activation of JNK in vascular smooth muscle cells [ 22].
Although the inflammatory response elicited by systemic LPS administration induces the production of the transcriptionally active Smad2 splice variant Smad2ΔExon3 (Dunn et al, 2005), which can replicate Smad3 transcriptional activity (Yagi et al, 1999), it remains unknown whether Smad2ΔExon3 can mediate activation of the Col1a1 gene promoter.
A family of stress-inducible GADD45-like proteins mediate activation of the stress-responsive MTK1/MEKK4 MAPKKK.
Kahn, M. L., Nakanishi-Matsui, M., Shapiro, M. J., Ishihara, H. & Coughlin, S. R. Protease-activated receptors 1 and 4 mediate activation of human platelets by thrombin.
Because anti-NKG2A revived IFN-γ secreting capability of NK cells (Fig. 3g), we expected that NK might mediate activation of T cell response through IFN-γ.
Raman, M., Earnest, S., Zhang, K., Zhao, Y. & Cobb, M. H. TAO kinases mediate activation of p38 in response to DNA damage.
Remarkably, gene expression profiling also revealed upregulation in the expression of Map3k4 and Map3k10, which are upstream kinases of MKKs and mediate activation of P3819,20, in P38α−/− erythroblasts (Fig. 2c).
