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Human Trafficking

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3261. Inhibition of human T-cell leukemia virus type 2 Rex function by truncated forms of Rex encoded in alternatively spliced mRNAs. Full Text available with Trip Pro

Inhibition of human T-cell leukemia virus type 2 Rex function by truncated forms of Rex encoded in alternatively spliced mRNAs. Three mRNA species encoding the x-III open reading frame are expressed in human T-cell leukemia virus type 2 (HTLV-2)-infected cells. An mRNA composed of exons 1, 2, and 3 produces the essential posttranscriptional regulator Rex; shorter 1-3 and 1-B mRNAs encode a family of x-III proteins of unknown function that represent truncated forms of Rex. This report presents (...) a correlation between phosphorylation and intracellular trafficking of Rex and suggested that the mechanism underlying the inhibitory effects of the x-III proteins might result from an interference with these processes.

1997 Journal of virology

3262. Human macrophage inflammatory protein alpha (MIP-1 alpha) and MIP-1 beta chemokines attract distinct populations of lymphocytes Full Text available with Trip Pro

Human macrophage inflammatory protein alpha (MIP-1 alpha) and MIP-1 beta chemokines attract distinct populations of lymphocytes Lymphocyte trafficking is an essential process in immune and inflammatory functions which can be thought to contain at least two main components: adhesion and migration. Whereas adhesion molecules such as the selections are known to mediate the homing of leukocytes from the blood to the endothelium, the chemoattractant substances responsible for the migration (...) of specific subsets of lymphocytes to sites of infection or inflammation are largely unknown. Here we show that two molecules in the chemokine (for chemoattractant cytokine) superfamily, human macrophage inflammatory protein 1 alpha (MIP-1 alpha) and MIP-1 beta, do not share identical attractant activities for lymphocyte subpopulations. When analyzed in vitro in microchemotaxis experiments, HuMIP-1 beta tends to attract CD4+ T lymphocytes, with some preference for T cells of the naive (CD45RA) phenotype

1993 The Journal of experimental medicine

3263. Arachidonic acid and freshly isolated human bone marrow mononuclear cells. Full Text available with Trip Pro

Arachidonic acid and freshly isolated human bone marrow mononuclear cells. Arachidonic acid (AA), a fatty acid found in the human bone marrow plasma, is the precursor of eicosanoids that modulate bone marrow haematopoiesis. To further our understanding of the role of AA in the bone marrow physiology, we have assessed its incorporation in human bone marrow mononuclear cells. Gas chromatography analysis indicates the presence of AA in their fatty acid composition. In bone marrow mononuclear cells (...) , [3H]-AA is incorporated into triglycerides and is later delivered into phospholipids, a result not observed with blood mononuclear cells. Prelabelling-chase experiments indicate a trafficking of labelled AA from phosphatidylcholine to phosphatidylethanolamine. Stimulation of prelabelled bone marrow mononuclear cells with granulocyte-macrophage colony-stimulating factor (GM-CSF) results in the release of a part of the incorporated labelled AA. Finally, exogenous AA (up to 1 microM) has

1999 Mediators of inflammation

3264. Incorporation and effect of arachidonic acid on the growth of human myeloma cell lines. Full Text available with Trip Pro

that [3H]AA is incorporated unmodified in U266, IM9 and OPM2 phospholipids, and is linked by an ester bond. Prelabeling-chase experiments indicate no trafficking of labeled AA among the various phospholipid species. Addition of AA and lipoxygenase products of AA (leukotriene B4 and C4, lipoxin A4 and B4, 12- and 15-hydroxyeicosatetraenoic acid) have no effect on U266, IM9 and OPM2 proliferation assessed by [3H]thymidine incorporation into DNA. In conclusion, while human myeloma cells readily (...) Incorporation and effect of arachidonic acid on the growth of human myeloma cell lines. The objectives of this work are to investigate the incorporation of arachidonic acid (AA) in the human myeloma cell lines OPM2, U266 and IM9, and to assess the effect of AA and lipoxygenase products of AA on their growth. The kinetics of acylation of [3H]AA indicates that myeloma cells incorporate AA into their membrane phospholipids and triglycerides. PLA2-treatment and base hydrolysis experiments confirm

1999 Mediators of inflammation

3265. Deficient Peptide Loading and MHC Class II Endosomal Sorting in a Human Genetic Immunodeficiency Disease: the Chediak-Higashi Syndrome Full Text available with Trip Pro

Deficient Peptide Loading and MHC Class II Endosomal Sorting in a Human Genetic Immunodeficiency Disease: the Chediak-Higashi Syndrome The Chediak-Higashi syndrome (CHS) is a human recessive autosomal disease caused by mutations in a single gene encoding a protein of unknown function, called lysosomal-trafficking regulator. All cells in CHS patients bear enlarged lysosomes. In addition, T- and natural killer cell cytotoxicity is defective in these patients, causing severe immunodeficiencies. We (...) and morphology. In contrast to giant multilaminar compartments that bear most of the usual lysosomal markers in these cells (HLA-DR, HLA-DM, Lamp-1, CD63, etc.), multivesicular late endosomes displayed reduced levels of all these molecules, suggesting a defect in transport from the trans-Golgi network and/or early endosomes into late multivesicular endosomes. Further insight into a possible mechanism of this transport defect came from immunolocalizing the lysosomal trafficking regulator protein

1998 The Journal of cell biology

3266. The sulphonylurea receptor SUR1 regulates ATP-sensitive mouse Kir6.2 K+ channels linked to the green fluorescent protein in human embryonic kidney cells (HEK 293) Full Text available with Trip Pro

The sulphonylurea receptor SUR1 regulates ATP-sensitive mouse Kir6.2 K+ channels linked to the green fluorescent protein in human embryonic kidney cells (HEK 293) 1. Using a chimeric protein comprising the green fluorescent protein (GFP) linked to the C-terminus of the K+ channel protein mouse Kir6.2 (Kir6.2-C-GFP), the interactions between the sulphonylurea receptor SUR1 and Kir6.2 were investigated in transfected human embryonic kidney cells (HEK 293) by combined imaging and patch clamp (...) trafficking of Kir6.2 into the plasma membrane.

1998 The Journal of physiology

3267. Secretion and apparent activation of human hepatic lipase requires proper oligosaccharide processing in the endoplasmic reticulum. Full Text available with Trip Pro

Secretion and apparent activation of human hepatic lipase requires proper oligosaccharide processing in the endoplasmic reticulum. Human hepatic lipase (HL) is a glycoprotein with four N-linked oligosaccharide side chains. The importance of glycosylation for the secretion of catalytically active HL was studied in HepG2 cells by using inhibitors of intracellular trafficking, N-glycosylation and oligosaccharide processing. Secretion of HL was inhibited by carbonyl cyanide m-chlorophenylhydrazone (...) -coupled increase in HL activity is only partly explained by true activation. We conclude that oligosaccharide processing by glucosidases in the endoplasmic reticulum is necessary for the transport of newly synthesized human HL, but not alpha1-antitrypsin, to the Golgi, where the catalytic activity of HL is unmasked.

1999 Biochemical Journal

3268. Multimer Formation Is Not Essential for Nuclear Export of Human T-Cell Leukemia Virus Type 1 Rex trans-Activator Protein Full Text available with Trip Pro

Multimer Formation Is Not Essential for Nuclear Export of Human T-Cell Leukemia Virus Type 1 Rex trans-Activator Protein The Rex trans-regulatory protein of human T-cell leukemia virus type 1 (HTLV-1) is required for the nuclear export of incompletely spliced and unspliced viral mRNAs and is therefore essential for virus replication. Rex is a nuclear phosphoprotein that directly binds to its cis-acting Rex response element RNA target sequence and constantly shuttles between the nucleus (...) trans activation could be reconstituted by fusion to a heterologous leucine zipper dimerization interface. The intracellular trafficking capabilities of wild-type and mutant Rex proteins reveal that biologically inactive and multimerization-deficient Rex mutants are still efficiently translocated from the nucleus to the cytoplasm. This observation indicates that multimerization is essential for Rex function but is not required for nuclear export. Finally, we are able to provide an improved model

1998 Journal of virology

3269. Phenotypic and functional characterization of lymphocytes derived from normal and HIV-1-infected human lymph nodes Full Text available with Trip Pro

Phenotypic and functional characterization of lymphocytes derived from normal and HIV-1-infected human lymph nodes Lymph nodes are the major site of cell-to-cell transmission and replication of HIV-1. Trafficking of CD4+ T lymphocytes into lymph nodes provides a continual supply of susceptible target lymphocytes, and conversely, recruitment of CD8+ T lymphocytes may be critical for the host response that attempts to control HIV-1 replication. The present study was undertaken as no detailed (...) function-associated antigen-1 (LFA-1). In an in vitro adhesion assay, lymphocytes from HIV-1-infected nodes were significantly more adhesive than control lymphocytes on fibronectin, as well as recombinant human intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) substrates. This combination of altered lymphocyte subpopulations in the HIV-1-infected lymph nodes, as well as enhanced adhesion phenotype and function, suggests that T lymphocyte traffic to lymph nodes

1999 Clinical and experimental immunology

3270. A novel transferable nuclear export signal mediates CRM1-independent nucleocytoplasmic shuttling of the human cytomegalovirus transactivator protein pUL69 Full Text available with Trip Pro

that are exemplified by the ICP27 of herpes simplex virus were described recently as nucleocytoplasmic shuttling proteins. Here we report that pUL69 of the beta-herpesvirus human cytomegalovirus is a nuclear protein that is able to shuttle between the nucleus and the cytoplasm independently of virus-encoded cofactors. In contrast to proteins containing a leucine-rich export signal, the shuttling activity of pUL69 was not affected by leptomycin B, indicating that pUL69 trafficking is not mediated by the export (...) A novel transferable nuclear export signal mediates CRM1-independent nucleocytoplasmic shuttling of the human cytomegalovirus transactivator protein pUL69 The best studied nuclear export processes are mediated by classical leucine-rich nuclear export signals that specify recognition by the CRM1 export receptor. However, details concerning alternative nuclear export signals and pathways are beginning to emerge. Within the family of Herpesviridae, a set of homologous regulatory proteins

2001 The EMBO journal

3271. Daxx-Mediated Accumulation of Human Cytomegalovirus Tegument Protein pp71 at ND10 Facilitates Initiation of Viral Infection at These Nuclear Domains Full Text available with Trip Pro

Daxx-Mediated Accumulation of Human Cytomegalovirus Tegument Protein pp71 at ND10 Facilitates Initiation of Viral Infection at These Nuclear Domains Human cytomegalovirus (HCMV) starts immediate-early transcription at nuclear domains 10 (ND10), forming a highly dynamic immediate transcript environment at this nuclear site. The reason for this spatial correlation remains enigmatic, and the mechanism for induction of transcription at ND10 is unknown. We investigated whether tegument-based (...) transactivators are involved in the specific intranuclear location of HCMV. Here, we demonstrate that the HCMV transactivator tegument protein pp71 accumulates at ND10 before the production of immediate-early proteins. Intracellular trafficking of pp71 is facilitated through binding to a coiled-coil region of Daxx. The C-terminal domain of Daxx then interacts with SUMO-modified PML, resulting in the deposition of pp71 at ND10. In Daxx-deficient cells, pp71 does not accumulate at ND10, proving in vivo

2002 Journal of virology

3272. Tyrosine kinases activate store-mediated Ca2+ entry in human platelets through the reorganization of the actin cytoskeleton. Full Text available with Trip Pro

Tyrosine kinases activate store-mediated Ca2+ entry in human platelets through the reorganization of the actin cytoskeleton. We have recently reported that store-mediated Ca(2+) entry in platelets is likely to be mediated by a reversible trafficking and coupling of the endoplasmic reticulum with the plasma membrane, a model termed 'secretion-like coupling'. In this model the actin cytoskeleton plays a key regulatory role. Since tyrosine kinases have been shown to be important for Ca(2+) entry (...) that these two families of proteins have independent effects in the activation of store-mediated Ca(2+) entry in human platelets.

2000 Biochemical Journal

3273. Free Major Histocompatibility Complex Class I Heavy Chain Is Preferentially Targeted for Degradation by Human T-Cell Leukemia/Lymphotropic Virus Type 1 p12I Protein Full Text available with Trip Pro

Free Major Histocompatibility Complex Class I Heavy Chain Is Preferentially Targeted for Degradation by Human T-Cell Leukemia/Lymphotropic Virus Type 1 p12I Protein Human T-cell leukemia virus type 1 (HTLV-1) establishes a persistent infection in the host despite a vigorous virus-specific immune response. Here we demonstrate that an HTLV-1-encoded protein, p12(I), resides in the endoplasmic reticulum (ER) and Golgi and physically binds to the free human major histocompatibility complex class I (...) heavy chains (MHC-I-Hc) encoded by the HLA-A2, -B7, and -Cw4 alleles. As a result of this interaction, the newly synthesized MHC-I-Hc fails to associate with beta(2)-microglobulin and is retrotranslocated to the cytosol, where it is degraded by the proteasome complex. Targeting of the free MHC-I-Hc, and not the MHC-I-Hc-beta(2)-microglobulin complex, by p12(I) represents a novel mechanism of viral interference and disrupts the intracellular trafficking of MHC-I, which results in a significant

2001 Journal of virology

3274. The Highly Conserved C-Terminal Dileucine Motif in the Cytosolic Domain of the Human Immunodeficiency Virus Type 1 Envelope Glycoprotein Is Critical for Its Association with the AP-1 Clathrin Adapter Full Text available with Trip Pro

The Highly Conserved C-Terminal Dileucine Motif in the Cytosolic Domain of the Human Immunodeficiency Virus Type 1 Envelope Glycoprotein Is Critical for Its Association with the AP-1 Clathrin Adapter Short amino acid sequences in the cytosolic domains of transmembrane proteins are recognized by specialized adaptor [corrected] proteins which are part of coated vesicles utilized to transport membrane proteins between the trans-Golgi network (TGN) and the plasma membrane (forward and backward (...) ). Previously, we and others reported that the membrane-proximal tyrosine residues Y712 (human immunodeficiency virus [HIV]) and Y721 (simian immunodeficiency virus [SIV]) in the envelope glycoprotein (Env) of the primate lentiviruses are crucial for the association of Env with clathrin-associated adaptor [corrected] complex AP-2. The same tyrosine-based endocytosis motifs in the cytosolic domains (EnvCD) of transmembrane gp41 of HIV type 1 (HIV-1) and SIV, respectively, were also shown to modulate

2001 Journal of virology

3275. Ligand regulation of green fluorescent protein-tagged forms of the human β1- and β2-adrenoceptors; comparisons with the unmodified receptors Full Text available with Trip Pro

Ligand regulation of green fluorescent protein-tagged forms of the human β1- and β2-adrenoceptors; comparisons with the unmodified receptors Stable clones of HEK293 cells expressing either FLAG(TM) epitope-tagged, wild type human beta(1)- and beta(2)-adrenoceptors or C-terminally green fluorescent protein (GFP)-tagged forms of these receptors were established. The binding affinity of [(3)H]-dihydroalprenolol and other ligands was little affected by addition of GFP to the C-terminal of either (...) remained at the cell surface. These results indicate that although GFP tagging of beta-adrenoceptors can provide qualitative visual patterns of agonist-induced receptor trafficking and regulation in HEK293 cells the quantitative details vary markedly from those obtained with the unmodified receptors.

2000 British journal of pharmacology

3276. Expression of vascular adhesion molecules on human endothelia in autoimmune thyroid disorders. Full Text available with Trip Pro

Expression of vascular adhesion molecules on human endothelia in autoimmune thyroid disorders. Cellular activation and expression of certain adhesion molecules within vascular endothelium is a critical event in leucocyte recruitment and emigration. A wide array of different adhesion receptors has been identified to mediate the interaction between endothelial cells (EC) and leucocyte subpopulations. In this study, the tissue expression of E-selectin, P-selectin, CD31, and endoglin endothelial (...) - and P-selectins, CD31 and endoglin by thyroid EC in GD and HT may reflect their ability to regulate leucocyte trafficking and activation.

1995 Clinical and experimental immunology

3277. Properties of the human arginine vasopressin V2 receptor after site-directed mutagenesis of its putative palmitoylation site. Full Text available with Trip Pro

Properties of the human arginine vasopressin V2 receptor after site-directed mutagenesis of its putative palmitoylation site. Most G-protein-coupled receptors have conserved cysteine residues in their C-terminal cytoplasmic domain that appear to be generally palmitoylated. An example is the human arginine vasopressin V2 receptor with cysteine residues at positions 341 and 342. Site-directed mutagenesis of the putative palmitoylation site was used to study the significance of palmitoylation (...) receptor is important for intracellular trafficking and/or sequestration/internalization but not for agonist binding or activation of the Gs/adenylate cyclase system.

1996 Biochemical Journal

3278. The ontogeny of adhesion molecules expressed on the vascular endothelium of the developing human skin. Full Text available with Trip Pro

The ontogeny of adhesion molecules expressed on the vascular endothelium of the developing human skin. One of the important functions of adhesion molecules is to regulate the trafficking of lymphocytes and other leucocytes between the different organs and tissues of the body. These molecules are expressed on both the endothelial cells and the leucocytes, enabling them to adhere to one another and ultimately lead to extravasation of the leucocytes from the circulation into the surrounding tissue

1996 Journal of anatomy

3279. The human T-cell lymphotropic virus type 1 Tof protein contains a bipartite nuclear localization signal that is able to functionally replace the amino-terminal domain of Rex. Full Text available with Trip Pro

The human T-cell lymphotropic virus type 1 Tof protein contains a bipartite nuclear localization signal that is able to functionally replace the amino-terminal domain of Rex. The X region of human T-cell lymphotropic virus type 1 (HTLV-1) encodes two nucleolar/nuclear proteins, the posttranscriptional regulator of mRNA expression Rex and a protein of unknown function named Tof. To gain insight into the possible biological role of Tof, we investigated the mechanism governing its intracellular (...) trafficking and identified its nucleolar/nuclear localization signal (NLS). Mutational analysis of Tof revealed that its NLS was located between amino acids 71 and 98 and contained two arginine-rich domains that functioned in an interdependent manner. Studies of Tof-Rex hybrid proteins showed that the Tof NLS could functionally replace the NLS of Rex at the level of nuclear targeting. As the NLS of Rex is known to mediate its interaction with its RNA target, the Rex-responsive element (RXRE), we tested

1997 Journal of virology

3280. Very late antigen integrins are involved in the adhesive interaction of lymphoid cells to human gingival fibroblasts. Full Text available with Trip Pro

Very late antigen integrins are involved in the adhesive interaction of lymphoid cells to human gingival fibroblasts. To date, it is still unclear how the trafficking and retention of activated lymphocytes in periodontal lesions are regulated. In this study, we investigated the molecular basis for the adhesive interactions between lymphocytes and human gingival fibroblasts (HGF). Peripheral blood T lymphocytes (PBT) exhibited binding ability, but only when the calls were activated with phorbol (...) 12-myristate 13-acetate (PMA). Among several human cell lines tested, PMA-stimulated Molt-4, a human T-cell leukaemia line, also displayed significant binding ability to HGF. In order to clarify the molecule(s) involved in this cell-cell interaction, a panel of monoclonal antibodies (mAb) was prepared to PMA-activated Molt-4 and one clone, 4-145, was selected on the basis of its ability to block the binding of PMA-activated Molt-4 to HGF. Moreover, 4-145 inhibited the binding of not only

1993 Immunology

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