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      CHO microRNA engineering is growing up: Recent successes and future challenges

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          Abstract

          microRNAs with their ability to regulate complex pathways that control cellular behavior and phenotype have been proposed as potential targets for cell engineering in the context of optimization of biopharmaceutical production cell lines, specifically of Chinese Hamster Ovary cells. However, until recently, research was limited by a lack of genomic sequence information on this industrially important cell line. With the publication of the genomic sequence and other relevant data sets for CHO cells since 2011, the doors have been opened for an improved understanding of CHO cell physiology and for the development of the necessary tools for novel engineering strategies. In the present review we discuss both knowledge on the regulatory mechanisms of microRNAs obtained from other biological models and proof of concepts already performed on CHO cells, thus providing an outlook of potential applications of microRNA engineering in production cell lines.

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          Most cited references166

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          MicroRNA-21 is an antiapoptotic factor in human glioblastoma cells.

          MicroRNAs (miRNAs) are small noncoding RNA molecules that regulate protein expression by targeting the mRNA of protein-coding genes for either cleavage or repression of translation. The roles of miRNAs in lineage determination and proliferation as well as the location of several miRNA genes at sites of translocation breakpoints or deletions has led to the speculation that miRNAs could be important factors in the development or maintenance of the neoplastic state. Here we show that the highly malignant human brain tumor, glioblastoma, strongly over-expresses a specific miRNA, miR-21. Our studies show markedly elevated miR-21 levels in human glioblastoma tumor tissues, early-passage glioblastoma cultures, and in six established glioblastoma cell lines (A172, U87, U373, LN229, LN428, and LN308) compared with nonneoplastic fetal and adult brain tissues and compared with cultured nonneoplastic glial cells. Knockdown of miR-21 in cultured glioblastoma cells triggers activation of caspases and leads to increased apoptotic cell death. Our data suggest that aberrantly expressed miR-21 may contribute to the malignant phenotype by blocking expression of critical apoptosis-related genes.
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            miR-21-mediated tumor growth.

            MicroRNAs (miRNAs) are approximately 22 nucleotide non-coding RNA molecules that regulate gene expression post-transcriptionally. Although aberrant expression of miRNAs in various human cancers suggests a role for miRNAs in tumorigenesis, it remains largely unclear as to whether knockdown of a specific miRNA affects tumor growth. In this study, we profiled miRNA expression in matched normal breast tissue and breast tumor tissues by TaqMan real-time polymerase chain reaction miRNA array methods. Consistent with previous findings, we found that miR-21 was highly overexpressed in breast tumors compared to the matched normal breast tissues among 157 human miRNAs analysed. To better evaluate the role of miR-21 in tumorigenesis, we transfected breast cancer MCF-7 cells with anti-miR-21 oligonucleotides and found that anti-miR-21 suppressed both cell growth in vitro and tumor growth in the xenograft mouse model. Furthermore, this anti-miR-21-mediated cell growth inhibition was associated with increased apoptosis and decreased cell proliferation, which could be in part owing to downregulation of the antiapoptotic Bcl-2 in anti-miR-21-treated tumor cells. Together, these results suggest that miR-21 functions as an oncogene and modulates tumorigenesis through regulation of genes such as bcl-2 and thus, it may serve as a novel therapeutic target.
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              MiR-33 contributes to the regulation of cholesterol homeostasis.

              Cholesterol metabolism is tightly regulated at the cellular level. Here we show that miR-33, an intronic microRNA (miRNA) located within the gene encoding sterol-regulatory element-binding factor-2 (SREBF-2), a transcriptional regulator of cholesterol synthesis, modulates the expression of genes involved in cellular cholesterol transport. In mouse and human cells, miR-33 inhibits the expression of the adenosine triphosphate-binding cassette (ABC) transporter, ABCA1, thereby attenuating cholesterol efflux to apolipoprotein A1. In mouse macrophages, miR-33 also targets ABCG1, reducing cholesterol efflux to nascent high-density lipoprotein (HDL). Lentiviral delivery of miR-33 to mice represses ABCA1 expression in the liver, reducing circulating HDL levels. Conversely, silencing of miR-33 in vivo increases hepatic expression of ABCA1 and plasma HDL levels. Thus, miR-33 appears to regulate both HDL biogenesis in the liver and cellular cholesterol efflux.
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                Author and article information

                Journal
                Biotechnol Adv
                Biotechnol. Adv
                Biotechnology Advances
                Elsevier Science
                0734-9750
                1873-1899
                1 December 2013
                December 2013
                : 31
                : 8
                : 1501-1513
                Affiliations
                [a ]Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
                [b ]Biotechnology Core Laboratory, National Institute of Diabetes and Digestive and Kidney Diseases, National Institute of Health, Bldg 14A, Bethesda, MD 20892, USA
                [c ]Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
                [d ]Life Sciences, University of Warwick, UK
                [e ]National Institute for Cellular Biotechnology, Dublin City University, Dublin 9, Ireland
                [f ]Austrian Center of Industrial Biotechnology, Austria
                Author notes
                [* ]Corresponding author.
                [** ]Correspondence to: N. Borth, Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria. Tel.: + 43 1 47654 6232; fax: + 43 1 47654 6675. nicole.borth@ 123456boku.ac.at
                Article
                S0734-9750(13)00121-3
                10.1016/j.biotechadv.2013.07.007
                3854872
                23916872
                380fa938-8717-4ae8-8625-929b681d12ca
                © 2013 The Authors

                This document may be redistributed and reused, subject to certain conditions.

                History
                : 11 March 2013
                : 18 July 2013
                : 20 July 2013
                Categories
                Research Review Paper

                Biotechnology
                bioprocess relevant properties,microrna engineering,chinese hamster ovary cells

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