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Constructing a Novel Hypoxia-Inducible Bidirectional Shrna Expression Vector for Simultaneous Gene Silencing in Colorectal Cancer Gene Therapy Publisher Pubmed



Javan B1, 2 ; Shahbazi M1, 2, 3
Authors
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Authors Affiliations
  1. 1. Department of Molecular Medicine, School of Advanced Technologies in Medicine, Golestan University of Medical Sciences, Shast Kola road, Gorgan, 4934174516, Iran
  2. 2. Medical Cellular and Molecular Research Center, Golestan University of Medical Sciences, Gorgan, Iran
  3. 3. Arya Tina Gene (ATG), Biopharmaceutical Company, Gorgan, Iran

Source: Cancer Biotherapy and Radiopharmaceuticals Published:2018


Abstract

Background: Nonspecific siRNA expression limits its application in cancer gene therapy. Therefore, a tightly regulated and reversibly inducible RNAi system is required to conditionally control the gene expression. This investigation aims at constructing a hypoxia/colorectal tumor dual-specific bidirectional short hairpin RNA (shRNA) expression vector. Materials and Methods: First, carcinoma embryonic antigen (CEA) promoter designed in two directions. Then, pRNA-bipHRE-CEA vector was constructed by insertion of the vascular endothelial growth factor enhancer between two promoters for hypoxic cancer-specific gene expression. To confirm the therapeutic effect of the dual-specific vector, two shRNA oligonucleotides were inserted in the downstream of each promoter. QRT-polymerase chain reaction and western blot assays were performed to estimate the mRNA and protein expression levels. Results: Both mRNA and protein levels were significantly reduced (50%-60%) in the hypoxic colorectal cancer-treated cells when compared with the controls. Conclusion: The novel bidirectional hypoxia-inducible shRNA expression vector may be efficient in colorectal cancer-specific gene therapy. © 2018, Mary Ann Liebert, Inc.