β-catenin is a key effector of the Wnt signaling pathway, which binds members of the T-cell factor (TCF /lymphocyte enhancer binding factor (LEF) family of transcription factors and activates target genes transcription to be involved in development, tissue self-renewal and cancer [ 35].
However, IFN-β is activated in Huh7.5 by the dsRNA analogue poly(I C), showing than the Mda-5-mediated and the IPS-1 (also called MAVS, CARDIF or VISA) downstream pathway, which binds to both RIG-I and Mda5 to ensure a common signalling [26], [27], is functional in this cell line.
It follows that these Arf-GEFs are predicted in vivo targets for the fungal metabolite Brefeldin A (BFA), an established inhibitor of the secretory pathway which binds at the interface between the Sec7 domain and Arf-GDP in vitro [17], [18].
SFRP-1 codes for an antagonist of the Wnt pathway, which binds to the frizzled receptor and blocks frizzled Wnt interaction (Suzuki et al, 2004).
Finally, the gene encoding FOSL1, a FOS-like transcription factor activated by the ERK/MAPK pathway which binds cJUN to form a transcription complex [ 31, 32], was among the cartilage-selective genes identified.
Notable among these were the Nogo-receptor (Rtn4r) signaling pathway, which binds to extracellular inhibitors of neurite outgrowth, such as chondroitin sulfate proteoglycans (Cspg5) and myelin-related factors (Mbp, Rtn4) [ 44– 44].
The tumor necrosis factor (TNFa) is an important upstream protein of the NF-kB pathway, which binds to its receptor to recruit TNF receptor death domain (TRADD) and thus activates NF-kB.
As a part of such a program, Nanog transcription is modulated by a variety of transcription factors involved in stemness (e.g. FoxD3, Oct4/Sox2, Zfp143, TCF3, p53 and the Hedgehog (Hh) pathway effector Gli1), which bind to its proximal promoter region (Pan and Thomson, 2007; Chen et al, 2008a, b, 8; Po et al, 2010).
Many of the molecules along the pathway have multiple partners, which bind through the same site.
The PCP pathway is initiated by Wnt ligands, which bind to Fzd receptors and transduce the signal to Dvl (Heisenberg et al., 2000; Tada and Smith, 2000; Kilian et al., 2003; Qian et al., 2007; Wu et al., 2013).
