title: In vitro suppression of programmed cell death of B cells by tissue inhibitor of metalloproteinases-1.
abstract: Cellular pathways for induction of programmed cell death (PCD) have been identified, but little is known about specific extracellular matrix processes that may affect apoptosis along those pathways. In this study, a series of Burkitt's lymphoma (BL) cell lines were assayed for their expression of tissue inhibitor of metalloproteinases (TIMP)-1. Results indicate that TIMP-1-positive BL lines show resistance to cold-shock-induced apoptosis. Furthermore, recombinant TIMP-1, but not TIMP-2 or a synthetic metalloproteinase inhibitor (BB-94), confers resistance to apoptosis induced by both CD95-dependent and -independent (cold shock, serum deprivation, and gamma-radiation) pathways in TIMP-1-negative BL lines. TIMP-1 suppression of PCD is not due to metalloproteinase inhibition, as reduction and alkylation of the TIMP-1 did not abolish this activity. Retroviral induction of TIMP-1 not only resulted in cell survival but also in continued DNA synthesis for up to 5 d in the absence of serum, while controls underwent apoptosis. This resistance to apoptosis is reversed by anti-TIMP-1 antibodies, demonstrating that secreted TIMP-1 is active in blocking apoptosis. Furthermore, TIMP-1 upregulation induced expression of Bcl-XL but not Bcl-2 as well as decreased NF-kappaB activity as compared with controls. These results demonstrate that TIMP-1 suppresses apoptosis in B cells and suggests a novel activity for TIMP-1 in tissue homeostasis.
authors.affiliation: Flow Cytometry Unit, Hematopathology Section, National Cancer Institute, Bethesda, MD 20892-1500, USA.
authors.forename: L
authors.initials: L
authors.lastname: Guedez
authors.forename: W G
authors.initials: WG
authors.lastname: Stetler-Stevenson
authors.forename: L
authors.initials: L
authors.lastname: Wolff
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: P
authors.initials: P
authors.lastname: Fukushima
authors.forename: A
authors.initials: A
authors.lastname: Mansoor
authors.forename: M
authors.initials: M
authors.lastname: Stetler-Stevenson
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D001402:B-Lymphocytes / Q000187:drug effects* / Q000473:pathology; D002051:Burkitt Lymphoma / Q000473:pathology; D002478:Cells, Cultured; D003864:Depression, Chemical; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006801:Humans; D006965:Hyperplasia; D016328:NF-kappa B / Q000378:metabolism; D014411:Neoplastic Stem Cells / Q000187:drug effects*; D014066:Palatine Tonsil / Q000473:pathology; D010649:Phenylalanine / Q000031:analogs & derivatives / Q000494:pharmacology; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis; D011994:Recombinant Proteins / Q000494:pharmacology; D013876:Thiophenes / Q000494:pharmacology; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000494:pharmacology* / Q000502:physiology; D019716:Tissue Inhibitor of Metalloproteinase-2 / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D051020:bcl-X Protein
chemical_list: C494811:BCL2L1 protein, human; D004791:Enzyme Inhibitors; D016328:NF-kappa B; D019253:Proto-Oncogene Proteins c-bcl-2; D011994:Recombinant Proteins; D013876:Thiophenes; D019715:Tissue Inhibitor of Metalloproteinase-1; D051020:bcl-X Protein; D019716:Tissue Inhibitor of Metalloproteinase-2; D010649:Phenylalanine; C080985:batimastat