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Chicken hypersensitive site-4 insulator increases human serum albumin expression in bovine mammary epithelial cells modified with phiC31 integrase.

Biotechnol Lett. 2012 Dec 22;

Authors: Luo Y, Liu J, Liu Q, Zheng L, Wang Y, Su J, Hu G, Zhang Y


Achieving high expression levels of recombinant human serum albumin (HSA) for purification is a solution for the large amount of plasma-derived HSA needed in therapeutic applications. Here, we employed phiC31 integrase system and chicken hypersensitive site-4 (cHS4) insulators to construct a HSA expression vector for high-level HSA expression. The phiC31 integrase system mediated efficient transgene integration in bovine mammary epithelial cells (bMECs). A preferred pseudo attP site, which had 38 % identity with the 39 bp wild-type attP sequence, was detected in six out of 55 bMEC colonies. Addition of the cHS4 insulator to the phiC31 integrase system resulted in 8-20-fold increases of HSA expression compared with that of using integrase alone. Moreover, the reverse-oriented cHS4 insulator in the phiC31 integrase system provided the optimal level of HSA expression in bMECs.

PMID: 23264267 [PubMed - as supplied by publisher]