IL-8→Niacinamide→Tumor Necrosis Factor-alpha→poly-ADP-ribose

• 19567206(IL-8): Differential responses between monocytes and monocyte-derived macrophages for lipopolysaccharide stimulation of calves.

  TLRs mRNA expressions were unchanged after LPS stimulation of monocytes , while TLRs mRNA expressions in monocyte-derived macrophages were complicated.

• 9193661(Niacinamide): Role of ADP-ribosylation in activated monocytes/macrophages.

  In murine macrophages a 33 kDa cytosolic protein could be identified that in response to LPS changed its state of ADP-ribosylation , and in human monocytes we showed that the inhibitor nicotinamide prevents LPS induced phosphorylation of two cytosolic proteins of 36 kDa and 38 kDa (p36/38) LPS.

• 14669994(Tumor Necrosis Factor-alpha): Modulation of the activation of extracellular signal-regulated kinase (ERK) and the production of inflammatory mediators by ADP-ribosylation inhibitors.

  Here we have investigated the mechanism by which ADP-ribosylation inhibitors block signaling pathways induced in macrophages.

• 6309564(poly-ADP-ribose): ADP-ribosylation regulates the phosphorylation of histones by the catalytic subunit of cyclic AMP-dependent protein kinase.

  Therefore , the possibility that ADP-ribosylation may regulate the phosphorylation of histones phosphorylation in nuclei warrants further investigation.