title: Nuclear localization of the p75 neurotrophin receptor intracellular domain.
abstract: The p75 neurotrophin receptor, a member of the tumor necrosis factor superfamily of receptors, undergoes an alpha-secretase-mediated release of its extracellular domain, followed by a gamma-secretase-mediated intramembrane cleavage. Like amyloid precursor protein and Notch, gamma-secretase cleavage of the p75 receptor releases an intracellular domain (ICD). However, it has been experimentally challenging to determine the precise subcellular localization and functional consequences of the p75 ICD. Here, we utilized a nuclear translocation assay and biochemical fractionation approaches to follow the fate of the ICD. We found that the p75 ICD can translocate to the nucleus to activate a green fluorescent protein reporter gene. Furthermore, the p75 ICD was localized in nuclear fractions. Chromatin immunoprecipitation experiments indicated that nerve growth factor induced the association of endogenous p75 with the cyclin E(1) promoter. Expression of the p75 ICD resulted in modulation of gene expression from this locus. These results suggest that the p75 ICD generated by gamma-secretase cleavage is capable of modulating transcriptional events in the nucleus.
authors.affiliation: Molecular Neurobiology Program, Skirball Institute for Biomolecular Medicine, New York University School of Medicine, New York, New York 10016, USA.
authors.forename: Christopher N
authors.initials: CN
authors.lastname: Parkhurst
authors.forename: Niccoló
authors.initials: N
authors.lastname: Zampieri
authors.forename: Moses V
authors.initials: MV
authors.lastname: Chao
mesh_terms: D021581:Active Transport, Cell Nucleus / Q000187:drug effects / Q000502:physiology; D053829:Amyloid Precursor Protein Secretases / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D002467:Cell Nucleus / Q000235:genetics / Q000378:metabolism*; D019927:Cyclin E / Q000096:biosynthesis* / Q000235:genetics; D006367:HeLa Cells; D006801:Humans; D020932:Nerve Growth Factor / Q000378:metabolism / Q000494:pharmacology; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D015513:Oncogene Proteins / Q000096:biosynthesis* / Q000235:genetics; D016716:PC12 Cells; D011401:Promoter Regions, Genetic / Q000502:physiology; D017434:Protein Structure, Tertiary / Q000502:physiology; D051381:Rats; D017978:Receptors, Growth Factor; D017475:Receptors, Nerve Growth Factor / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic / Q000502:physiology
chemical_list: C475820:CCNE1 protein, human; D019927:Cyclin E; C484065:NGFR protein, human; D009419:Nerve Tissue Proteins; D015513:Oncogene Proteins; D017978:Receptors, Growth Factor; D017475:Receptors, Nerve Growth Factor; C068313:Ngfr protein, rat; D020932:Nerve Growth Factor; D053829:Amyloid Precursor Protein Secretases