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Construction of Eukaryotic Expression Vector with mBD1-mBD3 Fusion Genes and Exploring Its Activity against Influenza A Virus

by 1,†, 1,†, 1, 1, 1, 2, 1 and 1,3,*
1
Department of Microbiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu 610041, China
2
West China Second University Hospital, Sichuan University, Chengdu 610041, China
3
State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 29 November 2013 / Revised: 11 February 2014 / Accepted: 24 February 2014 / Published: 13 March 2014
(This article belongs to the Section Viral Immunology, Vaccines, and Antivirals)
Influenza (flu) pandemics have exhibited a great threat to human health throughout history. With the emergence of drug-resistant strains of influenza A virus (IAV), it is necessary to look for new agents for treatment and transmission prevention of the flu. Defensins are small (2–6 kDa) cationic peptides known for their broad-spectrum antimicrobial activity. Beta-defensins (β-defensins) are mainly produced by barrier epithelial cells and play an important role in attacking microbe invasion by epithelium. In this study, we focused on the anti-influenza A virus activity of mouse β-defensin 1 (mBD1) and β defensin-3 (mBD3) by synthesizing their fusion peptide with standard recombinant methods. The eukaryotic expression vectors pcDNA3.1(+)/mBD1-mBD3 were constructed successfully by overlap-PCR and transfected into Madin-Darby canine kidney (MDCK) cells. The MDCK cells transfected by pcDNA3.1(+)/mBD1-mBD3 were obtained by G418 screening, and the mBD1-mBD3 stable expression pattern was confirmed in MDCK cells by RT-PCR and immunofluorescence assay. The acquired stable transfected MDCK cells were infected with IAV (A/PR/8/34, H1N1, 0.1 MOI) subsequently and the virus titers in cell culture supernatants were analyzed by TCID50 72 h later. The TCID50 titer of the experimental group was clearly lower than that of the control group (p < 0.001). Furthermore, BALB/C mice were injected with liposome-encapsulated pcDNA3.1(+)/mBD1-mBD3 through muscle and then challenged with the A/PR/8/34 virus. Results showed the survival rate of 100% and lung index inhibitory rate of 32.6% in pcDNA3.1(+)/mBD1-mBD3group; the TCID50 titer of lung homogenates was clearly lower than that of the control group (p < 0.001). This study demonstrates that mBD1-mBD3 expressed by the recombinant plasmid pcDNA3.1(+)/mBD1-mBD3 could inhibit influenza A virus replication both in vitro and in vivo. These observations suggested that the recombinant mBD1-mBD3 might be developed into an agent for influenza prevention and treatment. View Full-Text
Keywords: influenza A virus; mouse beta-defensin; pcDNA3.1(+)/mBD1-mBD3; overlap-PCR; anti-virus activity influenza A virus; mouse beta-defensin; pcDNA3.1(+)/mBD1-mBD3; overlap-PCR; anti-virus activity
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MDPI and ACS Style

Li, W.; Feng, Y.; Kuang, Y.; Zeng, W.; Yang, Y.; Li, H.; Jiang, Z.; Li, M. Construction of Eukaryotic Expression Vector with mBD1-mBD3 Fusion Genes and Exploring Its Activity against Influenza A Virus. Viruses 2014, 6, 1237-1252. https://0-doi-org.brum.beds.ac.uk/10.3390/v6031237

AMA Style

Li W, Feng Y, Kuang Y, Zeng W, Yang Y, Li H, Jiang Z, Li M. Construction of Eukaryotic Expression Vector with mBD1-mBD3 Fusion Genes and Exploring Its Activity against Influenza A Virus. Viruses. 2014; 6(3):1237-1252. https://0-doi-org.brum.beds.ac.uk/10.3390/v6031237

Chicago/Turabian Style

Li, Wanyi, Yan Feng, Yu Kuang, Wei Zeng, Yuan Yang, Hong Li, Zhonghua Jiang, and Mingyuan Li. 2014. "Construction of Eukaryotic Expression Vector with mBD1-mBD3 Fusion Genes and Exploring Its Activity against Influenza A Virus" Viruses 6, no. 3: 1237-1252. https://0-doi-org.brum.beds.ac.uk/10.3390/v6031237

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