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排序方式: 共有57条查询结果,搜索用时 31 毫秒
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Cartwright N McMaster SK Sorrentino R Paul-Clark M Sriskandan S Ryffel B Quesniaux VF Evans TW Mitchell JA 《Shock (Augusta, Ga.)》2007,27(1):40-47
Pathogens contain specific pathogen-associated molecular patterns, which activate pattern recognition receptors of the innate immune system such as Toll-like receptors (TLRs). Although there is a clear evidence of how macrophages sense pathogens, we know less about such processes in vessels. This is critical to understand because activation of vascular cells and the subsequent induction of inflammatory genes by bacteria are crucial events in the development of septic shock. In the current study we have used genetically modified mice to investigate the role of TLRs, adapter proteins, tumor necrosis factor alpha (TNFalpha), and nitric oxide synthase II (NOSII) in vascular dysfunction induced by Gram-positive (Staphylococcus aureus) or Gram-negative (Escherichia coli) bacteria. Our data show that Gram-positive S. aureus or Gram-negative E. coli causes vascular dysfunction via the induction of NOSII. For S. aureus, this process requires TLR2, TLR6, myeloid differentiation factor 88 (MyD88) adapter-like, MyD88, and TNF, but not TLR4 or TLR1. Vascular dysfunction induced by E. coli requires TLR4 but has no requirement for TLR2, TLR1, TLR6, or TNF, and a partial but incomplete requirement of MyD88 and TIR domain-containing adapter inducing interferon-beta. Staphylococcus aureus induced NOSII protein expression in vascular smooth muscle cells but not in macrophages, whereas E. coli induced NOSII in both cell types. Our data are the first to establish the definitive roles of specific TLRs in the sensing of Gram-positive and Gram-negative bacteria by vessels and demonstrate that macrophages and blood vessels may differ in their response to pathogens. 相似文献
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Neshe Sriskandan Andrew Moody David C. Howlett 《The British journal of oral & maxillofacial surgery》2010
Hypersalivation associated with cerebral palsy may be treated with injection of botulinum toxin A (BTX-A) into the submandibular gland, and the use of ultrasound permits its accurate administration. In our series four patients with cerebral palsy and hypersalivation had bilateral ultrasound-guided injection of BTX-A into the submandibular gland. At 4 weeks there was objective improvement in all patients and subjective improvement in three. The only reported side effect was the temporary inability to retain prosthetic orbital globes in one patient. Ultrasound-guided injection of BTX-A for hypersalivation is effective, and side effects are rare, but they have yet to be fully described. 相似文献
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Claire E. Turner Prathiba Kurupati Siouxsie Wiles Robert J. Edwards Shiranee Sriskandan 《Vaccine》2009
Currently there is no licensed vaccine against the human pathogen Streptococcus pyogenes. The highly conserved IL-8 cleaving S. pyogenes cell envelope proteinase SpyCEP is surface expressed and is a potential vaccine candidate. A recombinant N-terminal part of SpyCEP (CEP) was expressed and purified. AntiCEP antibodies were found to neutralize the IL-8 cleaving activity of SpyCEP. CEP-immunized mice had reduced bacterial dissemination from focal S. pyogenes intramuscular infection and intranasal infection. We also identified a functional SpyCEP-homolog protease SeCEP, expressed by the equine pathogen Streptococcus equi, which was able to cleave both human and equine IL-8. CEP-immunized mice also demonstrated reduced bacterial dissemination from S. equi intramuscular infection. Therefore immunization against SpyCEP may provide protection against other streptococci species with homologous proteases. 相似文献
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Maria Radanova Galya Mihaylova Zhasmina Mihaylova Desislava Ivanova Oskan Tasinov Neshe Nazifova-Tasinova Pavel Pavlov Milko Mirchev Nikolay Conev Ivan Donev 《Current oncology (Toronto, Ont.)》2021,28(2):1204
The present study evaluated the prognostic role of circulating miRNA-618 in patients with metastatic colon cancer (mCC) and whether miR-618 gene rs2682818 single nucleotide polymorphisms (SNP) are associated with colon cancer susceptibility and expression levels of mature miR-618. In total, 104 patients with mCC before starting the chemotherapy were investigated. The expression status of circulating miR-618 in mCC was evaluated by quantitative PCR. TaqMan PCR assay was used for rs2682818 SNP genotyping. miR-618 was overexpressed in serum of mCC patients. Patients with high and intermediate expression of miR-618 had a significantly longer mean overall survival (OS) of 21 months than patients with low expression—16 months. In addition, multivariate Cox regression analysis confirmed the association between high/intermediate levels of miRNA-618 and longer OS, HR = 0.51, 95% CI: 0.30–0.86, p = 0.012. miR-618 rs2682818 SNP significantly decreased the risk of colon cancer susceptibility in both heterozygous codominant (AC vs. CC, OR = 0.39, 95% CI: 0.17–0.88, p = 0.024) and overdominant (AC vs. CC + AA, OR = 0.37, 95% CI: 0.16–0.85, p = 0.018) genetic models. Our data suggest that circulating miRNA-618 could be useful as a prognostic biomarker in mCC. Patients harboring AC rs2682818 genotype have a decreased risk for colon cancer in comparison with patients with CC and AA genotypes. 相似文献
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A case of acute nitrogen dioxide toxicity is described, together with its management and a review of the possible complications. 相似文献
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Nephrotic syndrome during treatment with interferon 总被引:1,自引:0,他引:1
K Sriskandan D E Tee K W Pettingale 《British medical journal (Clinical research ed.)》1985,290(6481):1590-1591
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Sriskandan S Ferguson M Elliot V Faulkner L Cohen J 《The Journal of antimicrobial chemotherapy》2006,58(1):117-124
OBJECTIVES: Polyclonal human intravenous immunoglobulin (IVIG) has been advocated as an adjunct to therapy in severe invasive streptococcal toxic shock because of its ability to neutralize superantigen toxins. The aim of this study was to assess IVIG therapeutic efficacy in an experimental model of streptococcal toxic shock. METHODS: To confirm the in vitro activity of IVIG against the Streptococcus pyogenes strain used in the study, IVIG was tested for superantigen neutralizing and bacterial opsonizing activity prior to in vivo studies. To evaluate the in vivo effects of IVIG in terms of microbiological outcome and disease severity in a superantigen-sensitive transgenic model of streptococcal shock, HLA-DQ transgenic mice were treated with IVIG either at the time of infection or after infection with S. pyogenes. Antibiotics were included in some studies. RESULTS: The IVIG preparation neutralized superantigenicity of S. pyogenes in vitro and enhanced bacterial killing in a whole blood assay. When given to mice at the time of S. pyogenes infection, IVIG neutralized circulating superantigens and reduced systemic inflammatory response. Remarkably, IVIG-enhanced systemic clearance of bacteria and enhanced neutrophil infiltrate into the infected tissues. However, when used in combination with penicillin and clindamycin in a delayed treatment setting, IVIG did not confer additional therapeutic benefit, in terms of inflammatory response, bacterial clearance or survival. CONCLUSIONS: IVIG monotherapy can confer benefit in experimental streptococcal shock, but extension of these findings to the clinical situation will require further evaluation. 相似文献