111 research outputs found

    Construction and optimization of novel recombinant Adeno-Associated Virus rAAV2/5 for targeting microglia to regulate immune responses during neuroinflammation

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    Activated microglia promote central nervous system (CNS) inflammation through antigen presentation and secretion of pro-inflammatory cytokines and chemokines. Although this activation is necessary to protect the brain during infection, aberrant release of pro-inflammatory and/or cytotoxic factors such as tumor necrosis factor-α, interleukin-1β, nitric oxide and reactive oxygen substances may lead to neuronal damage and degeneration. Targeting microglia during neuroinflammation to regulate the expression of cytokines without affecting other cell types in the CNS is challenging since no specific microglial markers have yet been established that distinguish microglia from infiltrating, peripheral myeloid cells. Therefore, we propose that a viral-based gene delivery system might be a better strategy to regulate gene expression in microglia. Using the recombinant Adeno-associated virus (AAV) vector pseudotype 2/5, which preferentially infects microglia (, we constructed a plasmid backbone which contains GFP under the control of the F4/80 promoter, a macrophage-specific marker. In order to demonstrate the specificity of this promoter for macrophages, we transfected human kidney cells HEK 293 cells, mouse leukemic macrophages RAW 264.7 cells, human hepatocytes cell line (HepG2) and human ovarian carcinoma cell line (1A9) with the AAV-F4/80-eGFP construct or the control plasmid AAV-CAG-eGFP. Our results indicate that the rAAV-F4/80-GFP construct is selective for macrophages. To begin to assess the usefulness of this system to alter microglia function, we have cloned the Membrane Associated Ring-CH protein (MARCHI) into the rAAV-F4/80-eGFP vector that has been shown earlier to regulate antigen presentation by inducing the intracellular sequestration of MHC class II. We were able to confirm this finding by transfecting interferon gamma stimulated macrophages cell line RAW 264.7 cells via our constructed AAV-F4/80-MARCHI-eGFP vector and demonstrate the ability of our recombinant AAV vector that is driven by specific promoter to deliver and express MARCHI to induce MHC class II sequestration. Together this work will lead to the development of tools that will allow us to dissect the pathways by which microglia promote neuroinflammation

    The arabic version of the Personality Inventory for the DSM-5 (PID-5) in a clinical sample of United Arab Emirates (UAE) nationals

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    Objectives: We aimed to test the potential of the Arabic version of the PID-5 to distinguish between clinical and non-clinical participants, as well as to examine its convergent validity and factor structure in an Emirati clinical sample. Methods: The Arabic version of the PID-5 was administered to a clinical sample comprised of 156 participants (Mage = 31.38, SD = 8.99, 37.8% male, 62.2% female) and a community sample also comprised of 156 participants (Mage = 31.43, SD = 9.52, 37.2% male, 62.8% female). We addressed the descriptive measures, internal consistency, mean rank scores differences, convergent validity with SCL-90-R, and PID-5's factor structure. Results: As expected, the clinical sample presented statistically significantly higher scores than the non-clinical sample, with medium to high effect sizes. In addition, all the PID-5 domains showed positive correlations with most of the symptomatic constellations of the SCL-90-R as well as the PID-5 facets with all their SCL-90-R counterparts. However, our findings did not entirely replicate the PID-5 original 5-factor structure, as only a 4-factor solution was retained. Conclusions: Future studies with the Arabic PID-5 in clinical samples are needed to understand its relevance and clinical utility in Arabic countries.info:eu-repo/semantics/publishedVersio

    The Arabic Version of the Personality Inventory for the DSM-5 (PID-5) in a Clinical Sample of United Arab Emirates (UAE) Nationals

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    Objectives: We aimed to test the potential of the Arabic version of the PID-5 to distinguish between clinical and non-clinical participants, as well as to examine its convergent validity and factor structure in an Emirati clinical sample. Methods: The Arabic version of the PID-5 was administered to a clinical sample comprised of 156 participants (Mage = 31.38, SD = 8.99, 37.8% male, 62.2% female) and a community sample also comprised of 156 participants (Mage = 31.43, SD = 9.52, 37.2% male, 62.8% female). We addressed the descriptive measures, internal consistency, mean rank scores differences, convergent validity with SCL-90-R, and PID-5\u27s factor structure. Results: As expected, the clinical sample presented statistically significantly higher scores than the non-clinical sample, with medium to high effect sizes. In addition, all the PID-5 domains showed positive correlations with most of the symptomatic constellations of the SCL-90-R as well as the PID-5 facets with all their SCL-90-R counterparts. However, our findings did not entirely replicate the PID-5 original 5-factor structure, as only a 4-factor solution was retained. Conclusions: Future studies with the Arabic PID-5 in clinical samples are needed to understand its relevance and clinical utility in Arabic countries

    Injury to the tunica media initiates atherogenesis in the presence of hyperlipidemia

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    Background and aimsFatty streaks initiating the formation of atheromatous plaque appear in the tunica intima. The tunica media is not known to be a nidus for lipid accumulation initiating atherogenesis. We assessed changes to the tunica media in response to a micro-injury produced in the pig aorta. In addition, we assessed human carotid endarterectomy plaques for indication of atheroma initiation in the tunica media.MethodsThree healthy landrace female pigs underwent laparotomy to inject autologous blood and create micro-hematomas at 6 sites within the tunica media of the infrarenal abdominal aorta. These pigs were fed a high-fat diet (HFD) for 4–12 weeks. Post-mortem aortas from all pigs, including a control group of healthy pigs, were serially stained to detect lipid deposits, vasa vasora (VV), immune cell infiltration and inflammatory markers, as well as changes to the vascular smooth muscle cell (vSMC) compartment. Moreover, 25 human carotid endarterectomy (CEA) specimens were evaluated for their lipid composition in the tunica media and intima.ResultsHigh lipid clusters, VV density, and immune cell infiltrates were consistently observed at 5 out of 6 injection sites under prolonged hyperlipidemia. The hyperlipidemic diet also affected the vSMC compartment in the tunica media adjacent to the tunica adventitia, which correlated with VV invasion and immune cell infiltration. Analysis of human carotid specimens post-CEA indicated that 32% of patients had significantly greater atheroma in the tunica media than in the arterial intima.ConclusionThe arterial intima is not the only site for atherosclerosis initiation. We show that injury to the media can trigger atherogenesis

    Transfer of technology to developing countries

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    SIGLEAvailable from British Library Document Supply Centre- DSC:D52285/84 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

    An evaluation of financial performance of companies

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    SIGLEAvailable from British Library Document Supply Centre- DSC:D52284/84 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
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