Proteomic, cellular and biochemical research into the stress protein NUPR1 reveals it binds to PARP1 in to the nucleus and inhibits PARP1 activity in vitro. Mutations on residues Ala33 or Thr68 of NUPR1 or treatment using its inhibitor ZZW-115 inhibits this effect. PARylation caused by 5-fluorouracil (5-FU) treatment methods are strongly enhanced by ZZW-115 and connected having a loss of NAD /NADH ratio and saved through the PARP inhibitor olaparib. Cell dying caused by ZZW-115 management of pancreas cancer-derived cells is saved by olaparib and improved with PARG inhibitor PDD00017273. The mitochondrial catastrophe caused by ZZW-115 treatment or by genetic inactivation of NUPR1 is connected to some hyperPARylation from the mitochondria, disorganization from the mitochondrial network, mitochondrial membrane potential decrease, with increase of superoxide production, intracellular degree of reactive oxygen species (ROS) and cytosolic amounts of Ca2 . These functions are saved by olaparib or NAD  precursor nicotinamide mononucleotide inside a dose-dependent manner and partly by antioxidants treatments. To conclude, inactivation of NUPR1 induces a hyperPARylation, which, induces a mitochondrial catastrophe and therefore a cell dying via a non-canonical Parthanatos, since apoptosis inducing-factor (AIF) isn’t translocated from the mitochondria.

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