TY - JOUR T1 - Inducible Expression of Human Gamma Interferon TT - بیان القایی اینترفرون گامای انسان JF - انستیتو-پاستور-ایران JO - انستیتو-پاستور-ایران VL - 10 IS - 4 UR - http://ibj.pasteur.ac.ir/article-1-254-en.html Y1 - 2006 SP - 197 EP - 202 KW - Inducible expression of IFN-g KW - IFN-g Cloning KW - Cumate-regulatable expression cassette KW - Chinese hamster ovary-cumate transactivator (CHO-CTA) N2 - Background:The premature termination of high producer clones, which will be killed due to cell proliferation and proteins production antagonism, is one of the basic drawback in recombinant proteins technology. Furtheremore, it is supposed some toxic proteins like interferon which we intended to clone and express, inhibit host cells’ proliferation. So, it is necessary to tightly control IFN-γ production during growing and selecting of highly producing clones. Methods: In the present study, we constructed an expression vector, pMPGB43P2(6)K containing the cumate-regulatable expression cassette to high production of human IFN-γ in Chinese Hamster Ovary- Cumate Transactivator (CHO-CTA). The clones were selected in the cumate and without cumate treated medium. Results: Our results showed, induced IFN-γ expression level was about 5 of magnitude higher than the constitive transgenic system. Conclusion: Application of cumate-regulatable expression cassette, which can be switch off and on by cumate, is useful to production of high producer clones and express toxic proteins in animal cells. M3 ER -