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Σελίδα 1 από 2476 Αποτελέσματα
Regulation of nucleoside transport by lipopolysaccharide, phorbol esters, and tumor necrosis factor-alpha in human B-lymphocytes.
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Nucleoside transport systems and their regulation in human B-lymphocytes have been characterized using the cell lines Raji and Bare lymphoma syndrome-1 (BLS-1) as experimental models. These cells express at least three different nucleoside transport systems as follows: a
Evidence that protein kinase Cepsilon mediates phorbol ester inhibition of calphostin C- and tumor necrosis factor-alpha-induced apoptosis in U937 histiocytic lymphoma cells.
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Protein kinase C (PKC) activators, such as the tumor-promoting phorbol esters, have been reported to protect several cell lines from apoptosis induced by a variety of agents. Recent evidence suggests that PKCepsilon is involved in protection of cardiac myocytes from hypoxia-induced cell death (Gray,
Regulation of lymphotoxin-beta by tumor necrosis factor, phorbol myristate acetate, and ionomycin in Jurkat T cells.
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Lymphotoxin-beta (LT- beta) is a tumor necrosis factor (TNF)-related membrane-bound cytokine that forms a heterotrimeric surface lymphotoxin (LT) complex with LT-alpha on the surface of lymphoid cells. Although knockout studies have revealed a role in lymph node biogenesis during development, the
Tumor necrosis factor-alpha, interleukin 1, and phorbol myristate acetate are independent activators of NF-kappa B which differentially activate T cells.
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Gene expression in eukaryotic cells can be altered in different ways by extracellular agents, including mitogens and cytokines. Such differential gene expression is mediated in part through the effects of these stimuli on distinct sets of cellular transcription factors. In this report, the effects
Different size limitations for increased transepithelial paracellular solute flux across phorbol ester and tumor necrosis factor-treated epithelial cell sheets.
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By observing increases in the transepithelial paracellular permeability of a range of radiolabeled solutes and electron dense dyes, changes in molecular sieving caused by the cytokine, TNF (tumor necrosis factor), and the phorbol ester, TPA (12-0-tetra-decanoylphorbol-13-acetate), were
Abrogation of in vitro suppression of human immunodeficiency virus type 1 (HIV-1) replication mediated by CD8+ T lymphocytes of asymptomatic HIV-1 carriers by staphylococcal enterotoxin B and phorbol esters through induction of tumor necrosis factor alpha.
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CD8+ T lymphocytes of asymptomatic human immunodeficiency virus type 1 (HIV-1) carriers (AC) suppress HIV-1 replication in vitro. Failure of host defense mechanisms and increased virus proliferation are associated with disease progression. The exact mechanisms inducing these changes at the advanced
Regulation of matrix metalloproteinase expression in human vein and microvascular endothelial cells. Effects of tumour necrosis factor alpha, interleukin 1 and phorbol ester.
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Matrix metalloproteinases (MMPs) play a role in tissue remodelling and angiogenesis. We have investigated the expression and regulation of MMP-1 (interstitial collagenase), MMP-2 (gelatinase A), MMP-3 (stromelysin 1), MMP-7 (matrilysin), MMP-9 (gelatinase B) and their inhibitors TIMP-1 and TIMP-2 in
Synergistic induction of apoptosis in human myeloid leukemia cells by phorbol 12-myristate 13-acetate and flavopiridol proceeds via activation of both the intrinsic and tumor necrosis factor-mediated extrinsic cell death pathways.
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Previous studies have shown that coexposure to marginally toxic concentrations of phorbol 12-myristate 13-acetate (PMA; 10 nM) and the cyclin-dependent kinase inhibitor flavopiridol (FP; 100-200 nM) synergistically induces apoptosis in human myeloid leukemia cells U937 and HL-60 (i.e., >50%
Phorbol 12-myristate 13-acetate protects against tumor necrosis factor (TNF)-induced necrotic cell death by modulating the recruitment of TNF receptor 1-associated death domain and receptor-interacting protein into the TNF receptor 1 signaling complex: Implication for the regulatory role of protein kinase C.
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Protein kinase C (PKC) triggers cellular signals that regulate proliferation or death in a cell- and stimulus-specific manner. Although previous studies have demonstrated that activation of PKC with phorbol 12-myristate 13-acetate (PMA) protects cells from apoptosis induced by a number of
Expression of cytosolic phospholipase A2 alpha in murine C12 cells, a variant of L929 cells, induces arachidonic acid release in response to phorbol myristate acetate and Ca2+ ionophores, but not to tumor necrosis factor-alpha.
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Tumor necrosis factor-alpha (TNFalpha)-induced cell death is regulated through the release of arachidonic acid (AA) by group IVA cytosolic phospholipase A2 (cPLA2alpha) in the murine fibroblast cell line L929. However, the signaling pathway by which TNFalpha activates cPLA2alpha remained to be
Induction of monocytic differentiation by tumor necrosis factor in phorbol ester-resistant KG-1a cells.
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Tumor necrosis factor (TNF) is a regulatory cytokine that has pleiotropic effects on hematopoietic cell growth and differentiation. The present studies have examined the effects of TNF on the differentiation of phorbol-ester resistant human KG-la leukemia cells. Treatment with 100 U/mL of TNF or 33
Platelet-activating factor antagonists suppress the generation of tumor necrosis factor-alpha and superoxide induced by lipopolysaccharide or phorbol ester in rat liver macrophages.
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Platelet-activating factor (PAF) has been shown to play an important role in the generation of tumor necrosis factor-alpha (TNF-alpha) and superoxide in guinea pig peritoneal macrophages. In this study, the effects of the PAF receptor antagonists, WEB 2170 and RP 59277, and of a PAF analogue, HAGPT,
Tumor necrosis factor (TNF) and phorbol ester induce TNF-related apoptosis-inducing ligand (TRAIL) under critical involvement of NF-kappa B essential modulator (NEMO)/IKKgamma.
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We show that tumor necrosis factor (TNF) and phorbol 12-myristate 13-acetate (PMA) induce TNF-related apoptosis-inducing ligand (TRAIL) in T cells. In cells deficient for NF-kappaB essential modulator (NEMO)/IKKgamma, an essential component of the NF-kappaB-inducing I-kappaB kinase (IKK) complex,
Intercellular adhesion molecule-1 gene expression in human endothelial cells. Differential regulation by tumor necrosis factor-alpha and phorbol myristate acetate.
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Intercellular adhesion molecule-1 (ICAM-1) is an inducible glycoprotein expressed on the surface of inflamed endothelium which mediates in part the extravasation of granulocytes into sites of infection or injury. ICAM-1 mRNA is not detected in unstimulated human umbilical vein endothelial cells
Decreased phorbol myristate acetate-induced release of tumor necrosis factor-alpha and interleukin-1 beta from peripheral blood monocytes of patients chronically infected with hepatitis C virus.
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Hepatitis C virus (HCV) has been detected in peripheral blood mononuclear cells (PBMC) from persons chronically infected with HCV. Reports describe altered monocytic function during HCV infection; however, the immunologic consequences of HCV tropism for human macrophages are not well defined. Thus,
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