title: Efficient biotechnological approach for lentiviral transduction of induced pluripotent stem cells.
abstract: Induced pluripotent stem (iPS) cells are generated from differentiated adult somatic cells by reprogramming them. Unlimited self-renewal, and the potential to differentiate into any cell type, make iPS cells very promising candidates for basic and clinical research. Furthermore, iPS cells can be genetically manipulated for use as therapeutic tools. DNA can be introduced into iPS cells, using lentiviral vectors, which represent a helpful choice for efficient transduction and stable integration of transgenes. In this study, we compare two methods of lentiviral transduction of iPS cells, namely, the suspension method and the hanging drop method. In contrast to the conventional suspension method, in the hanging drop method, embryoid body (EB) formation and transduction occur concurrently. The iPS cells were cultured to form EBs, and then transduced with lentiviruses, using the conventional suspension method and the hanging drop method, to express miR-128 and green fluorescent protein (GFP). The number of transduced cells were assessed by fluorescent microscopy and flow cytometry. MTT assay and real-time PCR were performed to determine the cell viability and transgene expression, respectively. Morphologically, GFP+ cells were more detectable in the hanging drop method, and this finding was quantified by flow cytometric analysis. According to the results of the MTT assay, cell viability was considerably higher in the hanging drop method, and real-time PCR represented a higher relative expression of miR-128 in the iPS cells introduced with lentiviruses in drops. Altogether, it seems that lentiviral transduction of challenging iPS cells using the hanging drop method offers a suitable and sufficient strategy in their gene transfer, with less toxicity than the conventional suspension method.
authors.affiliation: a Department of Clinical Biochemistry and Laboratory , Faculty of Medicine, Tabriz University of Medical Sciences , Tabriz , Iran.|b Department of Cellular Biology , Stem Cell Technology Research Center , Tehran , Iran.|c Neurosciences Research Center, Tabriz University of Medical Sciences , Tabriz , Iran.
authors.forename: Mehrak
authors.initials: M
authors.lastname: Zare
authors.affiliation: d Department of Haematology , School of Medicine, Tarbiat Modares University , Tehran , Iran.
authors.forename: Masoud
authors.initials: M
authors.lastname: Soleimani
authors.affiliation: e Amol Faculty of Paramedical Sciences, Mazandaran University of Medical Sciences , Sari , Iran.
authors.forename: Mozhdeh
authors.initials: M
authors.lastname: Mohammadian
authors.affiliation: f Department of Medical Nanotechnology , Faculty of Advanced Medical Science, Tabriz University of Medical Sciences , Tabriz , Iran.
authors.forename: Abolfazl
authors.initials: A
authors.lastname: Akbarzadeh
authors.affiliation: b Department of Cellular Biology , Stem Cell Technology Research Center , Tehran , Iran.
authors.forename: Parvaneh
authors.initials: P
authors.lastname: Havasi
authors.affiliation: a Department of Clinical Biochemistry and Laboratory , Faculty of Medicine, Tabriz University of Medical Sciences , Tabriz , Iran.|c Neurosciences Research Center, Tabriz University of Medical Sciences , Tabriz , Iran.
authors.forename: Nosratollah
authors.initials: N
authors.lastname: Zarghami
mesh_terms: D001709:Biotechnology / Q000379:methods*; D057809:HEK293 Cells; D006801:Humans; D057026:Induced Pluripotent Stem Cells / Q000166:cytology / Q000378:metabolism*; D016086:Lentivirus / Q000235:genetics*; D014161:Transduction, Genetic / Q000379:methods*
keywords: flow cytometry; hanging drop; induced pluripotent stem cells; lentiviral transduction