TY - JOUR ID - 16926 TI - Molecular Cloning and Expression of Human Gamma Interferon (IFN-g) Full cDNA in Chinese Hamster Ovary (CHO) Cells JO - Iranian Journal of Immunology JA - IJI LA - en SN - 1735-1383 AU - Zamani, Alireza AU - Afshari, Jalil Tavakkol AU - Alikhani, Mohammad Yousef AD - Department of Immunology and AD - Department of Immunology and Allergy, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran AD - Microbiology, School of Medicine, Hamedan University of Medical Sciences, Hamedan, Iran Y1 - 2006 PY - 2006 VL - 3 IS - 1 SP - 1 EP - 8 KW - IFN-g KW - CHO KW - cDNA DO - N2 - Background: IFN-g is mostly secreted by activated CD4+ , CD8+ T cells and NK cells. This cytokine has immunomodulatory, anti-cancer and anti-microbial effects and is important for prophylaxis, diagnosis and treatment of chronic infections and cancers. Objective: The purpose of this study was to clone the full cDNA of human IFN-g and express it in CHO cell line. Methods: Lymphocytes from a healthy individual were isolated and activated by phytohaemagglutinin (PHA) in vitro. After 4 hours, total RNA extracted and first cDNA strand was synthesized. cDNA was amplified with primers containing EcoRI and NotI sites. The amplified fragment and the PcDNA3.1 vector were cut by EcoRI and NotI and ligated. The construct (pcDNA3.1-IFN-γ) was transferred into E.coli (DH5α strain) using CaCl2 method and selected by plating on a medium containing ampicillin. The construct sequence was confirmed by PCR and sequence analysis. Construct expression was achieved by performing a calcium phosphate-mediated transfection into CHO cells and followed by selection of stable drug (G418) resistant clones by limiting dilution assay (LDA). The IFN-γ production by transfected CHO cells was measured using ELISA technique. Results and Conclusion: Out of 33 grown transformed bacterial colonies, only 6 had the entire sequences of the inserted fragment and one of them was used for the transfection experiment. Out of 768 wells, 5 clones produced more than 100 ng/ml/106 cells of IFN-γ. Among the 5 clones, one with the maximum production of INF-g (143 ng/ml/106 cells) was selected and used for propagation. UR - https://iji.sums.ac.ir/article_16926.html L1 - https://iji.sums.ac.ir/article_16926_da39144403315f575733df512ed6c5ff.pdf ER -