Characterization of cholesterol 25-hydroxylase expression in human macrophages

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dc.contributor.advisor Bessong, Pascal O.
dc.contributor.advisor Hahn, Young Shin
dc.contributor.advisor Jennelle, Lucas
dc.contributor.author Magoro, Tshifhiwa
dc.date 2019
dc.date.accessioned 2019-10-16T13:55:34Z
dc.date.available 2019-10-16T13:55:34Z
dc.date.issued 2019-09-20
dc.identifier.citation Magoro, Tshifhiwa (2019) Characterization of cholesterol 25-hydroxylase expression in human macrophages, University of Venda, South Africa.<http://hdl.handle.net/11602/1474>.
dc.identifier.uri http://hdl.handle.net/11602/1474
dc.description PhD (Microbiology) en_US
dc.description Department of Microbiology
dc.description.abstract Background Conversion of Cholesterol to 25-HydroxyCholesterol (25HC) by Cholesterol 25-hydroxylase (CH25H) has been shown to exert broad antiviral properties. Given its antiviral activities, CH25H is part of an increasingly appreciated connection between type I interferon (IFN-I) and lipid metabolism. Moreover, the details of this connection appear to differ in mouse and human cells. Nevertheless, the molecular basis for the induction of CH25H in humans is not known. Objective Elucidation of signaling and transcriptional events for induction of CH25H expression is critical to design therapeutic antiviral agents. Materials and methods: Wildtype THP-1 monocytic cell-line or THP-1 MyD88 Knockout cell-line were treated with PMA for 72 hours for differentiation into macrophages. Differentiated macrophages or Microglial cells were stimulated with either TLR-agonists, pro-inflammatory cytokine, or interferons, and CH25H mRNAs expression levels were measured by qPCR. Results In this study, we show that CH25H is induced by Zika virus infection or TLR stimulation. Interestingly, CH25H is induced by pro-inflammatory cytokines including 1L- 1, TNF-, and IL-6, and this induction depends on STAT-1 transcription factor. Additionally, we have observed that ATF3 weakly binds to the CH25H promoter, suggesting co-operation with STAT-1. However, ZIKV induced CH25H was independent of type I interferon. Conclusion This study has demonstrated for the first time that pro-inflammatory cytokines such as 1L-1, TNF-, and IL-6 induce CH25H expression. Moreover, this provides further understanding to the connection between innate immunity and sterol metabolism and encourages the exploration of cytokines in antiviral immunity. en_US
dc.description.sponsorship NRF en_US
dc.format.extent 1 online resource (xviii, 169 leaves)
dc.language.iso en en_US
dc.rights University of Venda
dc.subject Cholestrol 25-hydroxylase en_US
dc.subject 25-hydroxylase en_US
dc.subject Pro-inflammatory cytokines en_US
dc.subject STAT-1 en_US
dc.subject ATF3 en_US
dc.subject TFLR Stimulation en_US
dc.subject.ddc 572.5795
dc.subject.lcsh Cholesterol hydroxylase
dc.subject.lcsh Oxidoreductases
dc.subject.lcsh Macrophages
dc.title Characterization of cholesterol 25-hydroxylase expression in human macrophages en_US
dc.type Thesis en_US

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