Construction And Evaluation Of Recombinant Plasmid Containing Human Triggering Receptor Expressed On Myeloid Cells-1 Gene

Objective:To construct a eukaryotic expression plasmid containing human triggering receptor expressed on myeloid cells-1 (TREM-1) gene.Materials and Methods:The entire gene coding region of human TREM-1 was amplified from total RNA of human peripheral blood by means of RT-PCR. The fragment of TREM-1 was cloned to vector pUCm-T. After digestion by restriction endonuclease BamH I and Pst I, the fragment was subcloned into the eukaryotic expressing vector pEGFP-C3. This recombinant vector was transfected into 293 cells using liposome. The expression level of TREM-1 was determined by fluorescence microscope and Western-Blot assay. The recombinant TREM-1vector was transfected into THP-1 cells. After stimulation with 100ng/ml LPS for 24h, the mRNA levels of TNF-a and IL-1βwere measured using RT-PCR.Results:The expression vector was constructed, and the result of the DNA sequencing showed that the constructed plasmid containing the TREM-1 gene. Fluorescence microscope and Western blot analysis showed that TREM-1 protein was expressed in 293 cells successfully. After transfection into THP-1 cells, recombinant TREM-1 could upregulate the mRNA levels of TNF-αand IL-1βConclusion:Eukaryotic expression plasmid pEGFP-TREM-1 is successfully constructed and showed biological activity.