title: Overexpression of Bcl-2 inhibits nuclear localization of annexin I during tumor necrosis factor-alpha-mediated apoptosis in porcine renal LLC-PK1 cells.
abstract: The addition of tumor necrosis factor (TNF)-alpha into the cultured porcine kidney LLC-PK1 cells caused apoptosis concomitantly with caspase-3 activation and the inductions of an endogenous Bcl-2 protein. An SDS-polyacrylamide electrophoretic analysis revealed that a 37-kDa protein in a nuclear fraction was increased during TNF-alpha-induced apoptosis. Partial amino acid sequence of the protein was A-L-T-G-H-L-E-E-V, perfectly matching that of annexin I. Immunocytochemistry revealed that annexin I migrated to the nucleus and/or peri-nucleus region upon exposure to TNF-alpha. Overexpression of Bcl-2 proteins inhibited the nuclear localization of annexin I during TNF-alpha-induced apoptosis. Antisense oligodeoxynucleotides complementary to annexin I-inhibited TUNEL (terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end-labelling) staining in TNF-alpha-treated cells, suggesting that annexin I expression is a possible prerequisite for the induction of apoptosis by the cytokine. Thus, it is first time to show that annexin I is regulated by an anti-apoptotic Bcl-2 protein in TNF-alpha-induced renal apoptotic events.
authors.affiliation: Endocrine Disruptors Research Projects, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan. ishidou@nies.go.jp
authors.forename: Masami
authors.initials: M
authors.lastname: Ishido
mesh_terms: D021581:Active Transport, Cell Nucleus; D000818:Animals; D017305:Annexin A1 / Q000235:genetics / Q000378:metabolism*; D017209:Apoptosis / Q000187:drug effects*; D002467:Cell Nucleus / Q000378:metabolism*; D016373:DNA, Antisense / Q000235:genetics; D005786:Gene Expression Regulation; D006801:Humans; D007668:Kidney / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D018374:LLC-PK1 Cells; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics / Q000378:metabolism*; D013552:Swine; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
chemical_list: D017305:Annexin A1; D016373:DNA, Antisense; D019253:Proto-Oncogene Proteins c-bcl-2; D014409:Tumor Necrosis Factor-alpha