title: The intracellular domain of p75NTR as a determinant of cellular reducing potential and response to oxidant stress.
abstract: The low-affinity neurotrophin receptor, p75NTR, has been found to be pro- or anti-apoptotic depending upon the cell in which it is expressed. Reactive oxygen species play a major role in apoptosis induction and enactment. Using two polyclonal PC12 populations that, respectively, do or do not express p75NTR, this paper demonstrates that p75NTR expression confers resistance to oxidant stress upon PC12 cells maintained in serum-containing medium. The effect of p75NTR on cell survival is mimicked in p75-negative cells by expression of constructs that produce the p75NTR intracellular domain (ICD) or p75NTR with the extracellular domain deleted (DeltaECD), suggesting that binding of an extracellular ligand to p75NTR is not required. Our studies further document that the differential sensitivity to oxidant stress is serum-dependent and associated with differential oxidation of glutathione between p75-positive and p75-negative cells. These results suggest that the role of p75NTR in determining the consequences and treatment of age-related disorders and conditions in which reactive oxygen species are involved may require neither the extracellular receptor domain nor, by inference, the cognate extracellular ligands of this neurotrophin receptor.
authors: Pediatric Center for Neuroscience, Children's Hospital of Pittsburgh, Pittsburgh, PA 15213, USA.
authors: Yulia Y
authors: YY
authors: Tyurina
authors: Karen D
authors: KD
authors: Nylander
authors: Zeljka Korade
authors: ZK
authors: Mirnics
authors: Carmel
authors: C
authors: Portugal
authors: Chaohua
authors: C
authors: Yan
authors: Clara
authors: C
authors: Zaccaro
authors: H Uri
authors: HU
authors: Saragovi
authors: Valerian E
authors: VE
authors: Kagan
authors: Nina F
authors: NF
authors: Schor
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology; D015152:Blotting, Northern; D015153:Blotting, Western; D002478:Cells, Cultured; D005455:Fluorescent Antibody Technique; D005978:Glutathione / Q000378:metabolism; D018384:Oxidative Stress / Q000502:physiology; D016716:PC12 Cells; D017434:Protein Structure, Tertiary; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism; D020800:Receptor, Nerve Growth Factor; D020917:Receptor, trkA / Q000378:metabolism; D017475:Receptors, Nerve Growth Factor / Q000096:biosynthesis / Q000502:physiology*; D013053:Spectrophotometry; D014162:Transfection
chemical_list: D017382:Reactive Oxygen Species; D020800:Receptor, Nerve Growth Factor; D017475:Receptors, Nerve Growth Factor; D020917:Receptor, trkA; D005978:Glutathione