例如:"lncRNA", "apoptosis", "WRKY"

Toll-like receptor 7 and MyD88 knockdown by lentivirus-mediated RNA interference to porcine dendritic cell subsets.

Gene Ther.2007 May;14(10):836-44. Epub 2007 Mar 01
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摘要


Sensing of viruses by dendritic cell (DC) pathogen recognition receptors (PRRs) represents a critical event during innate antiviral immune responses. Identification of these PRRs has often posed a problem due to difficulties in performing gene function studies in the naturally targeted hosts. Consequently, we developed a lentivirus (LV)-based strategy for specific gene knockdown in porcine DC. Short hairpin RNAs (shRNAs) were designed, targeting toll-like receptor 7 (TLR7) and the adaptor protein MyD88. As cellular targets, monocyte-derived DC (MoDC) and Flt3 ligand-induced DC (Flt3L-DC), DC precursors including monocytes and haematopoietic stem cells (HSCs) as well as plasmacytoid DCs (pDCs) were employed. Transduction efficiencies ranged from 40 to 95%. The LV-mediated shRNA delivery was functionally active, reducing TLR7 and MyD88 mRNA in MoDC and conventional Flt3L-DC, and blunting the responsiveness to TLR7 ligands in Flt3L-DC. Although infection of MoDC by the LV did neither influence MHC class II and CD80/86 expressions, nor cytokine responses, the infection of Flt3L-DC induced a phenotypic maturation. Furthermore, the interaction of the LV with pDC induced high levels of interferon-alpha. Taken together, these studies characterize the interaction of the LV with different DC subsets and demonstrate the suitability of LV-mediated small interfering RNA delivery for targeting PRR knockout for MoDC and conventional Flt3L-DC.

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