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  • 1
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 210, No. 1_Supplement ( 2023-05-01), p. 159.07-159.07
    Abstract: People living with HIV (PLWH) are at a higher risk of sever disease with SARS-CoV-2 virus infection. COVID-19 vaccines are effective in most PLWH, with significant reduction in the risk of severe disease or death when the standard 2-shot regimen is taken. However, suboptimal immune response to the standard course of vaccination is a concern for PLWH, especially for those with moderate to severe immunodeficiency. An additional dose is recommended as part of the extended primary series. In Taiwan, this additional dose is endorsed even for asymptomatic or mild immunodeficiency with CD4 counts & gt;200/mm 3and suppressed virology. We aimed to investigate the immune responses with the additional dose in PLWH asymptomatic or with mild immunodeficiency. We collected peripheral blood mononuclear cells (PBMC) from 72 PLWH asymptomatic or with mild immunodeficiency and from 362 non-HIV subjects, after two and three shots respectively. Two shots elicited lower responses in PLWH, although the difference was statistically insignificant. They have comparable levels of neutralizing and anti-S antibodies and comparable effector CD4+ and CD8+ T cell responses. The 3 rdshot boosted the SARS-CoV-2 immunity significantly more in PLWH compared to the non-HIV people. Upon in vitro stimulation with extracted Wuhan strain SARS-CoV-2 proteins, CD8+ T cells from PLWH after 3 shots has more durable effector responses than the non-HIV controls with extended time of stimulation. This subtle difference between PLWH and non-HIV people implied immune exhaustion with two shots in non-HIV people. Slightly compromised immunity in PLWH indeed preserved the functional capacity for further response to the 3 rdshot or natural infection. The Research Center for Emerging Viral Infections receives support from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE), Taiwan and NSTC 111-2634-F-182-001 from the National Science and Technology Council, Taiwan. This work was supported by Projects CMRPG3M1811 (CTH) from the Medical Research Project Fund, Chang Gung Memorial Hospital, Taiwan.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2023
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  • 2
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 173, No. 8 ( 2004-10-15), p. 5219-5228
    Abstract: In this study, we investigated the signaling pathways involved in bradykinin (BK)-induced NF-κB activation and cyclooxygenase-2 (COX-2) expression in human airway epithelial cells (A549). BK caused concentration- and time-dependent increase in COX-2 expression, which was attenuated by a selective B2 BK receptor antagonist (HOE140), a Ras inhibitor (manumycin A), a Raf-1 inhibitor (GW 5074), a MEK inhibitor (PD 098059), an NF-κB inhibitor (pyrrolidine dithiocarbate), and an IκB protease inhibitor (l-1-tosylamido-2-phenylethyl chloromethyl ketone). The B1 BK receptor antagonist (Lys-(Leu8)des-Arg9-BK) had no effect on COX-2 induction by BK. BK-induced increase in COX-2-luciferase activity was inhibited by cells transfected with the κB site deletion of COX-2 construct. BK-induced Ras activation was inhibited by manumycin A. Raf-1 phosphorylation at Ser338 by BK was inhibited by manumycin A and GW 5074. BK-induced ERK activation was inhibited by HOE140, manumycin A, GW 5074, and PD 098059. Stimulation of cells with BK activated IκB kinase αβ (IKKαβ), IκBα phosphorylation, IκBα degradation, p65 and p50 translocation from the cytosol to the nucleus, the formation of an NF-κB-specific DNA-protein complex, and κB-luciferase activity. BK-mediated increase in IKKαβ activity and formation of the NF-κB-specific DNA-protein complex were inhibited by HOE140, a Ras dominant-negative mutant (RasN17), manumycin A, GW 5074, and PD 098059. Our results demonstrated for the first time that BK, acting through B2 BK receptor, induces activation of the Ras/Raf-1/ERK pathway, which in turn initiates IKKαβ and NF-κB activation, and ultimately induces COX-2 expression in human airway epithelial cell line (A549).
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2004
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  • 3
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    Online Resource
    The American Association of Immunologists ; 2010
    In:  The Journal of Immunology Vol. 185, No. 3 ( 2010-08-01), p. 1450-1459
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 185, No. 3 ( 2010-08-01), p. 1450-1459
    Abstract: Dense accumulations of T cells are often found in peritumoral areas, which reduce the efficiency of contact-dependent lysis of tumor cells. We demonstrate in this study that the extracellular matrix (ECM) produced by tumors can directly regulate T cell migration. The transmigration rate of several T cells including peripheral blood primary T cell, Jurkat, and Molt-4 measured for glioma cells or glioma ECM was consistently low. Jurkat cells showed reduced amoeba-like shape formation and delayed ERK activation when they were in contact with monolayers or ECM of glioma cells as compared with those in contact with HepG2 and MCF-7 cells. Phospho-ERK was located at the leading edge of migrating Jurkat cells. Glioma cells, but not MCF-7 and HepG2 cells, expressed tenascin-C. Knocking down the tenascin-C gene using the short hairpin RNA strategy converted glioma cells to a transmigration-permissive phenotype for Jurkat cells regarding ERK activation, transmigration, and amoeba-like shape formation. In addition, exogenous tenascin-C protein reduced the amoeba-like shape formation and transmigration of Jurkat cells through MCF-7 and HepG2 cell monolayers. A high level of tenascin-C was visualized immunohistochemically in glioma tumor tissues. CD3+ T cells were detected in the boundary tumor area and stained strongly positive for tenascin-C. In summary, glioma cells can actively paralyze T cell migration by the expression of tenascin-C, representing a novel immune suppressive mechanism achieved through tumor ECM.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2010
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  • 4
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 182, No. 12 ( 2009-06-15), p. 7916-7927
    Abstract: Thrombin plays an important role in lung inflammatory diseases. Thrombin can induce connective tissue growth factor (CTGF) expression in lung fibroblasts. However, little is known about the signaling pathway in thrombin-induced CTGF expression. In this study, we investigated the role of apoptosis signal-regulating kinase 1 (ASK1) in thrombin-induced CTGF expression in human lung fibroblasts. Thrombin caused a concentration- and time-dependent increase in CTGF expression in WI-38 cells and primary lung fibroblasts. Thrombin-induced CTGF expression and CTGF-luciferase activity were inhibited by a protease-activated receptor 1 antagonist (SCH79797), the dominant-negative mutants (DNs) of ASK1 and JNK1/2, and an AP-1 inhibitor (curcumin). Thrombin caused ASK1 Ser967 dephosphorylation, the dissociation of ASK1 and 14-3-3, and a subsequent increase in ASK1 activity. Thrombin induced increases in JNK phosphorylation and kinase activity, which were attenuated by ASK1DN. Furthermore, SCH79797 diminished the thrombin-induced ASK1 and JNK activities. Thrombin-induced CTGF-luciferase activity was predominately controlled by the sequence −747 to −184 bp upstream of the transcription start site of the human CTGF promoter and was attenuated by transfection with the deleted AP-1 binding site construct. Thrombin caused increases in c-Jun phosphorylation, the formation of an AP-1-specific DNA-protein complex, and the recruitment of c-Jun to the CTGF promoter. Furthermore, thrombin-mediated AP-1 activation was inhibited by ASK1DN, JNK1/2DN, and SP600125. These results suggest for the first time that thrombin, acting through protease-activated receptor 1, activates the ASK1/JNK signaling pathway, which in turn initiates c-Jun/AP-1 activation and recruitment of c-Jun to the CTGF promoter and ultimately induces CTGF expression in human lung fibroblasts.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2009
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  • 5
    Online Resource
    Online Resource
    The American Association of Immunologists ; 2007
    In:  The Journal of Immunology Vol. 179, No. 7 ( 2007-10-01), p. 4589-4597
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 179, No. 7 ( 2007-10-01), p. 4589-4597
    Abstract: It has recently become apparent that the microenvironment made up of the extracellular matrix may affect cell signaling. In this study, we evaluated Fas-triggered apoptosis in T cells in contact with tumor cells, which resembles the cell-to-cell interactions found in tumor regions. Jurkat cells were less susceptible to the Fas-mediated apoptosis when cocultured with U118, HeLa, A549, and Huh-7 tumor cells. This was indicated by less plasma membrane alteration, an amelioration of the loss of mitochondria membrane potential, a decrease in caspase-8 and caspase-3 activation, a decrease in DNA fragmentation factor-45/35 cleavage, and a reduction in the breakage of DNA when compared with Jurkat cells cultured alone. In contrast, the tumor cell lines MCF-7 and HepG2 produced no such protective effect. This protective event was independent of the expression of Fas ligand on the tumor cells. Interrupting the β integrins-matrix interaction diminished the coculture effect. In Jurkat cells, cell matrix contact reduced the assembly of the Fas death-inducing signaling complex and Bcl-xL cleavage, but enhanced the phosphorylation of ERK1/2, p38 MAPK, and Akt. Only PI3K inhibitor, but not kinase inhibitors for MEK, ERK1/2, p38 MAPK, JNK, protein kinase C, and protein kinase A, completely abolished this tumor cell contact-associated protection and in parallel restored Fas-induced Bcl-xL cleavage as well as decreasing the phosphorylation of Bad at serine 136. Together, our results indicate that stimulation of the β integrin signal of T cells by contact with tumor cells may trigger a novel protective signaling through the PI3K/Akt pathway of T cells against Fas-mediated apoptosis.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2007
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  • 6
    Online Resource
    Online Resource
    The American Association of Immunologists ; 2000
    In:  The Journal of Immunology Vol. 165, No. 11 ( 2000-12-01), p. 6372-6380
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 165, No. 11 ( 2000-12-01), p. 6372-6380
    Abstract: The ubiquitin-dependent proteasome-mediated (Ub-Pr) degradation pathway has been shown to regulate a large variety of substrates, including nuclear, cytosolic, and membrane proteins. In mammalian systems, polyubiquitin modification has been identified in a number of cell surface receptors for more than a decade; however, its biological significance has remained unclear until recently. For growth factor receptors with intrinsic tyrosine kinase domains, polyubiquitination is believed to trigger the internalization and subsequent degradation via the lysosomal pathway. In this study we provide the first evidence that non-tyrosine kinase-type cytokine surface receptors, IL-9R α-chain, IL-2 receptor β-chain, and erythropoietin receptor, can be polyubiquitinated and degraded by proteasomes. The Ub-Pr pathway regulates both the basal level turnover and the ligand-induced degradation of the receptors. A previously identified putative molecular chaperon, valosin-containing protein, undergoes tyrosine phosphorylation in a cytokine-dependent manner and associates with the receptor complexes following receptor engagement, suggesting that valosin-containing protein may target the ubiquitinated receptors to the proteasome for degradation.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2000
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  • 7
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    Online Resource
    The American Association of Immunologists ; 2014
    In:  The Journal of Immunology Vol. 192, No. 1 ( 2014-01-01), p. 338-348
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 192, No. 1 ( 2014-01-01), p. 338-348
    Abstract: Thrombin, a serine protease, is a well-known coagulation factor generated during vascular injury and plays an important role in lung inflammation. We previously showed that the c-Src– and Rac/PI3K/Akt-dependent NF-κB pathways are involved in thrombin-induced IL-8/CXCL8 expression in human lung epithelial cells (A549). In this study, we investigated the role of the MEK kinase (MEKK)1/ERK/p90 ribosomal S6 kinase (RSK)1–dependent C/EBPβ signaling pathway in thrombin-induced IL-8/CXCL8 expression. Thrombin-induced IL-8/CXCL8 release and IL-8/CXCL8-luciferase activity were attenuated by small interfering RNA (siRNA) of C/EBPβ and by cells transfected with the C/EBPβ site mutation of the IL-8/CXCL8 construct. Moreover, thrombin-induced κB-luciferase activity was also inhibited by C/EBPβ siRNA. The thrombin-induced increases in IL-8/CXCL8 release and IL-8/CXCL8-luciferase were also inhibited by MEKK1 siRNA, PD98059 (an MEK inhibitor), U0126 (an ERK inhibitor), and RSK1 siRNA. Treatment of cells with thrombin caused an increase in C/EBPβ phosphorylation at Thr235, C/EBPβ-luciferase activity, recruitment of C/EBPβ to the IL-8/CXCL8 promoter, and C/EBPβ-specific DNA complex formation. Furthermore, thrombin-mediated C/EBPβ phosphorylation and C/EBPβ-luciferase activity were inhibited by MEKK1 siRNA, PD98059, and RSK1 siRNA. Stimulation of cells with thrombin resulted in an increase in RSK1 phosphorylation at Thr359/Ser363, and this effect was inhibited by MEKK1 siRNA and PD98059. The thrombin-induced increase in ERK activation was inhibited by MEKK1 siRNA. These results imply that thrombin activates the MEKK1/ERK/RSK1 signaling pathway, which in turn initiates C/EBPβ activation, recruitment of C/EBPβ to the IL-8/CXCL8 promoter, and C/EBPβ-specific DNA complex formation, and ultimately induces IL-8/CXCL8 expression and release in lung epithelial cells.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2014
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  • 8
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 186, No. 7 ( 2011-04-01), p. 4405-4414
    Abstract: Lectin-like oxidized low-density lipoprotein receptor 1 (LOX-1) plays a major role in oxidized low-density lipoprotein-induced vascular inflammation. Chlamydia pneumoniae has been found in atherosclerotic lesions and is related to atherosclerotic pathogenesis, although its specific mechanism remains unknown. This study was conducted to investigate the mechanisms of LOX-1 expression in GroEL1 (a heat shock protein from C. pneumoniae)-administered human coronary artery endothelial cells (HCAECs) and atherogenesis in hypercholesterolemic rabbits. We demonstrated that in the hypercholesterolemic rabbit model, GroEL1 administration enhanced fatty streak and macrophage infiltration in atherosclerotic lesions, which may be mediated by elevated LOX-1 expression. In in vitro study using HCAECs, stimulation with GroEL1 increased TLR4 and LOX-1 expression. Increased LOX-1 expression was downregulated by Akt activation and PI3K-mediated endothelial NO synthase activation. PI3K inhibitor and NO synthase inhibitor induced LOX-1 mRNA production, whereas the NO donor ameliorated the increasing effect of LOX-1 mRNA in GroEL1-stimulated HCAECs. LOX-1 expression was regulated by NADPH oxidase, which mediates reactive oxygen species production and intracellular MAPK signaling pathway in GroEL1-stimulated HCAECs. Treatment with polyethylene-glycol–conjugated superoxide dismutase, apocynin, or diphenylene iodonium significantly decreased GroEL1-induced LOX-1 expression, as did the knockdown of Rac1 gene expression by RNA interference. In conclusion, the GroEL1 protein may induce LOX-1 expression in endothelial cells and atherogenesis in hypercholesterolemic rabbits. The elevated level of LOX-1 in vitro may be mediated by the PI3K–Akt signaling pathway, endothelial NO synthase activation, NADPH oxidase-mediated reactive oxygen species production, and MAPK activation in GroEL1-stimulated HCAECs. The GroEL1 protein of C. pneumoniae may contribute to vascular inflammation and cardiovascular disorders.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2011
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  • 9
    Online Resource
    Online Resource
    The American Association of Immunologists ; 2007
    In:  The Journal of Immunology Vol. 178, No. 5 ( 2007-03-01), p. 3023-3030
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 178, No. 5 ( 2007-03-01), p. 3023-3030
    Abstract: The genomic organization of the chicken CD8α gene was investigated to determine the basis of its polymorphism. Contiguous to the CD8α gene we identified multiple DNA blocks possessing sequences homologous to CD8α. Gene conversions and recombination over evolutionary time among CD8α and these CD8α homologous genes seem to account for the observed polymorphism. Furthermore, these CD8α-like DNAs encode a distinct multigene family of immunoreceptors that have a charged or polar residue in place of the interspecies-conserved CD8α transmembrane proline residue and a short cytoplasmic tail nonhomologous to CD8α. The identification of this novel multigene family with an organization reminiscent of human killer Ig-like receptors raises compelling questions on their evolutionary relationship among immunoreceptors.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2007
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  • 10
    Online Resource
    Online Resource
    The American Association of Immunologists ; 2012
    In:  The Journal of Immunology Vol. 188, No. 1_Supplement ( 2012-05-01), p. 163.15-163.15
    In: The Journal of Immunology, The American Association of Immunologists, Vol. 188, No. 1_Supplement ( 2012-05-01), p. 163.15-163.15
    Abstract: Mutations in SAP (SLAM-associated protein) underlie the majority of cases of X-linked lymphoproliferative disease (XLP), a rare congenital disorder that often leads to fatal complications upon infection with Epstein-Barr virus. The small SH2-containing adaptor SAP transmits signaling via SLAM (signaling lymphocytic activation molecule) family receptors and has been shown to be critical for development and function of multiple immune cell types. Here, we have investigated the role of SLAM and SAP signaling in regulating the differentiation of naïve CD4 T cells into IL-17 secreting effectors (TH17 cells), a pro-inflammatory lineage implicated in host defense as well as autoimmune diseases. T cell receptor activation along with co-stimulating SLAM antibodies was found to augment TH17 cell differentiation in wild type but not SAP-deficient splenic T cells under IL-17 polarizing conditions. Furthermore, SAP-/- mice were protected from experimental autoimmune encephalomyelitis (EAE), exhibiting greatly decreased numbers of CNS-infiltrating TH17 cells and dramatically reduced disease severity. Collectively, these results suggest that SLAM-SAP interactions promote the differentiation of IL-17 secreting effector CD4 T cells both in vitro and in vivo.
    Type of Medium: Online Resource
    ISSN: 0022-1767 , 1550-6606
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    Language: English
    Publisher: The American Association of Immunologists
    Publication Date: 2012
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