Volume 14, Issue 2 (2011)                   mjms 2011, 14(2): 13-23 | Back to browse issues page

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Pouriayevali M H, Memarnejadian A R, Sadat S M, Zavva M, Siadat S D, Hartoonian C et al . Designing and construction of bicistronic plasmid pIRES-Igk/mIL18/Fc: potential implications for vaccine investigations. mjms. 2011; 14 (2) :13-23
URL: http://mjms.modares.ac.ir/article-30-175-en.html
1- Department of Hepatitis and AIDS, Pasteur Institute of Iran, Tehran
2- Asisstant Professor, Department of Hepatitis and AIDS, Pasteur Institute of Iran
3- Ph.D., Department of Hepatitis and AIDS, Pasteur Institute of Iran,
4- Department of Hepatitis and AIDS, Pasteur Institute of Iran
5- Associated Professor, Department of Hepatitis and AIDS, Pasteur Institute of Iran
6- Ph.D, Department of Virology, Pasteur Institute of Iran
Abstract:   (6922 Views)
Objective: IL18 is a cytokine that plays an important role in the T-cell-helper type 1 (Th1) response and hence, plasmid-encoded IL18 is considered as a potent genetic adjuvant for DNA vaccine studies. In this study, a bicistronic eukaryotic plasmid capable of secreting a more stable mouse IL18 (fused with Fcγ2a fragment) was constructed and expression of this chimer cytokine was also assessed. Materials and Methods: RNA purified from stimulated mouse spleenocytes and then cDNA corresponding to mouse IL18 (mIL18) and Fcγ2a fragments were constructed by RT-PCR. Sequential subcloning of mIL18 and IgG2aFc fragments first into pSL1180 and then pSecTag2 plasmids resulted in the fusion of mIL18/Fc and addition of immunoglobulin kappa signal sequence (Igk/mIL18/Fc), respectively. Final cloning of Igk/mIL18/Fc sequence downstream of CMV promoter into the NheI/XmaI sites of pIRES2-GFP plasmid and led to the construction of pIRES-Igk/mIL18/Fc plasmid, which was transfected to HEK293T cell line by Turbofec Transfection reagent and expression analysis, was evaluated by ELISA assay. Results: Restriction enzyme analysis of pSL-mIL18، pSL-mIL18/Fc، pSec-mIL18/Fc and pIRES- Igk/mIL18/Fc plasmids with the enzymes that were applied for clonings led to the isolation of fragments with expected size and then plasmid of pIRES- Igk/mIL18/Fc was also confirmed following sequencing reactions. Moreover, expression and secretion of mIL18 to the medium was evidenced in transfected 293T cells, compared to non-transfected controls. Conclusion: pIRES- Igk/mIL18/Fc plasmid possesses the capacity of the cloning and expression of putative antigen gene under the direction of IRES sequence, and also expression of mIL18 as a great secretive genetic adjuvant. This results can be useful to design an efficient DNA vaccine especially for inducing host cellular immune response, moreover, cab be considered a promising for accessing to new generation of DNA vaccine.
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Article Type: Original Manuscipt | Subject: Immunology|Medical Biotechnology
Received: 2011/03/12 | Accepted: 2011/06/25

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