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PMID |
Sentence |
1 |
12949405
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Cyclooxygenase (COX) enzymes catalyze the synthesis of prostaglandins and exist as two isoforms, COX-1 and COX-2.
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2 |
16272346
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Contrasting effects of cyclooxygenase-1 (COX-1) and COX-2 deficiency on the host response to influenza A viral infection.
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3 |
16272346
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The cyclooxygenase (COX) pathway is important in modulating immune responses and is also a major target of nonsteroidal anti-inflammatory drugs (NSAIDs) and the newer COX-2 inhibitors.
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4 |
16272346
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The purpose of the present study was to examine the effect of deficiency of COX-1 or COX-2 on the host response to influenza.
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5 |
16272346
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We used an influenza A viral infection model in wild type (WT), COX-1-/-, and COX-2-/- mice.
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6 |
16272346
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Infection induced less severe illness in COX-2-/- mice in comparison to WT and COX-1-/- mice as evidenced by body weight and body temperature changes.
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7 |
16272346
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COX-1-/- mice had enhanced inflammation and earlier appearance of proinflammatory cytokines in the BAL fluid, whereas the inflammatory and cytokine responses were blunted in COX-2-/- mice.
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8 |
16272346
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However, lung viral titers were markedly elevated in COX-2-/- mice relative to WT and COX-1-/- mice on day 4 of infection.
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9 |
16272346
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Levels of PGE2 were reduced in COX-1-/- airways whereas cysteinyl leukotrienes were elevated in COX-2-/- airways following infection.
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10 |
16272346
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Thus, deficiency of COX-1 and COX-2 leads to contrasting effects in the host response to influenza infection, and these differences are associated with altered production of prostaglandins and leukotrienes following infection.
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11 |
16272346
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COX-1 deficiency is detrimental whereas COX-2 deficiency is beneficial to the host during influenza viral infection.
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12 |
16822852
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Previous studies have shown that prostaglandin E(2) (PGE(2)) release by splenic F4/80(+) cyclooxygenase (COX)-2(+) macrophages (MØ) isolated from mice, treated with mycobacterial components, plays a major role in the regulation of immune responses.
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13 |
16822852
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However, splenic MØ, isolated from untreated mice and treated in vitro with lipopolysaccharide and interferon-gamma, express COX-1 and COX-2 within 1 day but release only minimal amounts of PGE(2) following elicitation with calcium ionophore A23187.
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14 |
16822852
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In sharp contrast, 14 days after HK-BCG treatment, PGE(2) release by COX-2(+) splenic MØ increased as much as sevenfold, and a greater increase was seen in IL-10(-/-) cells than in WT cells.
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15 |
17159912
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CpG-ODN induces the expression of cyclooxygenase (COX)-2, and its product prostaglandin (PG) E2 underlies an immunosuppressive network, therefore it is a simple strategy to use a COX-2 inhibitor for tumor vaccination with CpG-ODN.
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16 |
17464165
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Cyclo-oxygenase (COX)-2 inhibitors are also alleged to have a function in interrupting the development of HCC.
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17 |
17473370
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Vaccination efficacy can be amplified by depleting CD4;+CD25;+Foxp3;+ regulatory T cells (Treg), but the risk of inducing autoimmunity warrants new strategies to selectively amplify anti-tumor immunity when modulating Treg.
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18 |
17473370
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In the tumors, the major cyclooxygenase (COX)-2 product is prostaglandin E2(PGE2) which suppresses T and NK cells while amplifying Treg.
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19 |
26391398
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Ac2PIM-responsive miR-150 and miR-143 target receptor-interacting protein kinase 2 and transforming growth factor beta-activated kinase 1 to suppress NOD2-induced immunomodulators.
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20 |
26391398
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While Ac2PIM treatment of macrophages compromised their ability to induce NOD2-dependent immunomodulators like cyclooxygenase (COX)-2, suppressor of cytokine signaling (SOCS)-3, and matrix metalloproteinase (MMP)-9, no change in the NOD2-responsive NO, TNF-α, VEGF-A, and IL-12 levels was observed.
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21 |
26391398
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Further, genome-wide microRNA expression profiling identified Ac2PIM-responsive miR-150 and miR-143 to target NOD2 signaling adaptors, RIP2 and TAK1, respectively.
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22 |
26391398
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Interestingly, Ac2PIM was found to activate the SRC-FAK-PYK2-CREB cascade via TLR2 to recruit CBP/P300 at the promoters of miR-150 and miR-143 and epigenetically induce their expression.
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23 |
26391398
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Loss-of-function studies utilizing specific miRNA inhibitors establish that Ac2PIM, via the miRNAs, abrogate NOD2-induced PI3K-PKCδ-MAPK pathway to suppress β-catenin-mediated expression of COX-2, SOCS-3, and MMP-9.
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