In vitro effects of p38 inhibitors (p38i) on cytokine regulation were compared to inhibitors of other major signalling pathways including PI3 kinase, JNK, MEK-1, NF-κB or protein kinase C (PKC).
The current review article is an attempt to cover and establish an understanding of some major signalling pathways intervened through survival factors (IGF-1R), growth factors (TGF-α, EGF), Wnt, Hedgehog, interleukin, cytokinins and death factor receptor which are frequently dysregulated in prostate cancer.
The nervous and endocrine systems are major signalling pathways between external cues, such as the ambient temperature, and internal physiology responding to environmental changes [7].
We then went on to investigate the effect of C4BP/sCD154 complex on the major signalling pathways involved in primary cholangiocyte survival, NFkB (RelA), AP-1 (cJun/cFos) and STAT 3. We have previously shown that activation of cholangiocyte CD40 leads to transient RelA expression and sustained cJun/cFos and STAT 3 expression [3], [4] resulting in apoptosis.
Two major signalling pathways are involved: infestation by biotrophic pathogens or attack by sucking insects typically activates the salicylic acid (SA) pathway and results in systemic acquired resistance (SAR) against plant diseases, while attack by herbivores or necrotrophic pathogens usually triggers the jasmonic acid (JA) pathway [7] [10].
This observation corresponds well with analyses of the animal phosphoproteome employing the primary sequences of kinases from divergent animals, as well as with very recent data showing that all major signalling pathways are present in the Porifera phylum, which separated from other animals very early in animal evolution [30], [31].
PKA mediates a major signalling pathway that is crucial for linking stress responses and cell proliferation.
The Jak/Stat pathway represents a major signalling pathway that enables a cell to interpret and react to inflammatory signals and cytokines (Leonard and O'Shea, 1998).
Phosphoinositide 3-kinase, a lipid kinase that integrates different signals to balance survival and apoptosis, represents a major signalling pathway for cell proliferation.
Two major signaling pathways have been described for apoptosis induction.
Multi-layered phosphorylation cascades are architectures prevalent in some of our major signaling pathways.
