PMID- 9647239 OWN - NLM STAT- MEDLINE DCOM- 19980709 LR - 20100825 IS - 0022-1767 (Print) IS - 0022-1767 (Linking) VI - 161 IP - 1 DP - 1998 Jul 1 TI - The N-terminal domains target TNF receptor-associated factor-2 to the nucleus and display transcriptional regulatory activity. PG - 319-24 AB - The subcellular localization of the TNF receptor-associated factor-2 (TRAF2) adaptor protein in human endothelial cells, which mediates proinflammatory responses of TNF, has been analyzed by confocal immunofluorescence microscopy and by Western blotting of fractionated cell extracts. Rabbit antisera reactive with either amino- or carboxyl-terminal TRAF2 peptides frequently but not uniformly stain nuclei of cultured HUVEC or the established human endothelial cell line, ECV304. However, Western blotting reveals significant heterogeneity in the reactivities of these polyclonal Abs. Transiently transfected HUVEC expressing FLAG epitope-tagged TRAF2 consistently show prominent nuclear localization, and deletion mutants of TRAF2 identify the portion of the molecule responsible for nuclear localization as the amino-terminal ring finger domain. TNF treatment does not appear to influence the localization of endogenous or transfected TRAF2 protein. Transfection of the amino-terminal half of the TRAF2 molecule, containing the ring and zinc finger domains, which localizes to the nucleus, results in activation of E-selectin but not of NF-kappaB promoter-reporter gene transcription or of c-Jun N-terminal kinase activation. These observations suggest that TRAF2 may reside in the nucleus and directly regulate transcription, independent of its role in cytoplasmic signal transduction. FAU - Min, W AU - Min W AD - Boyer Center for Molecular Medicine, Yale University School of Medicine, New Haven, CT 06536, USA. FAU - Bradley, J R AU - Bradley JR FAU - Galbraith, J J AU - Galbraith JJ FAU - Jones, S J AU - Jones SJ FAU - Ledgerwood, E C AU - Ledgerwood EC FAU - Pober, J S AU - Pober JS LA - eng GR - HL-36003/HL/NHLBI NIH HHS/United States GR - T32-AI07019/AI/NIAID NIH HHS/United States GR - Wellcome Trust/United Kingdom PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - J Immunol JT - Journal of immunology (Baltimore, Md. : 1950) JID - 2985117R RN - 0 (Peptide Fragments) RN - 0 (Proteins) RN - 0 (Receptors, Tumor Necrosis Factor) RN - 0 (TNF Receptor-Associated Factor 2) SB - IM MH - Biological Transport/genetics/immunology MH - Cell Nucleus/genetics/*metabolism MH - Cells, Cultured MH - Cytoplasm/immunology/metabolism MH - Endothelium, Vascular/cytology/metabolism MH - Fluorescent Antibody Technique, Indirect MH - Humans MH - Peptide Fragments/genetics/physiology MH - Protein Biosynthesis MH - Protein Structure, Tertiary MH - Proteins/genetics/*metabolism MH - Receptors, Tumor Necrosis Factor/*metabolism MH - TNF Receptor-Associated Factor 2 MH - Transcription, Genetic/*immunology MH - Transfection/immunology MH - Umbilical Veins EDAT- 1998/07/01 00:00 MHDA- 1998/07/01 00:01 CRDT- 1998/07/01 00:00 PHST- 1998/07/01 00:00 [pubmed] PHST- 1998/07/01 00:01 [medline] PHST- 1998/07/01 00:00 [entrez] PST - ppublish SO - J Immunol. 1998 Jul 1;161(1):319-24.