Osteogenic programming of human mesenchymal stem cells with highly efficient intracellular delivery of RUNX2

Thiagarajan, Lalitha and Abu-Awwad, Hosam Al-Deen M. and Dixon, James E. (2017) Osteogenic programming of human mesenchymal stem cells with highly efficient intracellular delivery of RUNX2. Stem Cells Translational Medicine . ISSN 2157-6580

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Abstract

Mesenchymal stem cells (MSCs) are being exploited in regenerative medicine due to their tri-lineage differentiation and immunomodulation activity. Currently, there are two major challenges when directing the differentiation of MSCs for therapeutic applications. First, chemical and growth factor strategies to direct osteogenesis in vivo lack specificity for targeted delivery with desired effects. Second, MSC differentiation by gene therapy is difficult as transfection with existing approaches is clinically impractical (viral transfection) or have low efficacy (lipid-mediated transfection). These challenges can be avoided by directly delivering nonvirally derived recombinant protein transcription factors with the glycosaminoglycan-binding enhanced transduction (GET) delivery system (P21 and 8R peptides). We used the osteogenic master regulator, RUNX2 as a programming factor due to its stage-specific role in osteochondral differentiation pathways. Herein, we engineered GET-fusion proteins and compared sequential osteogenic changes in MSCs, induced by exposure to GET fusion proteins or conventional stimulation methods (dexamethasone and Bone morphogenetic protein 2). By assessing loss of stem cell-surface markers, upregulation of osteogenic genes and matrix mineralization, we demonstrate that GET-RUNX2 efficiently transduces MSCs and triggers osteogenesis by enhancing target gene expression directly. The high transduction efficiency of GET system holds great promise for stem cell therapies by allowing reproducible transcriptional control in stem cells, potentially bypassing problems observed with high-concentration growth-factor or pleiotropic steroid therapies.

Item Type: Article
Keywords: Intracellular transduction; Glycosaminoglycan-binding enhanced transduction; Cell-penetrating peptide; Osteogenesis; RUNX2
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Pharmacy
Identification Number: 10.1002/sctm.17-0137
Depositing User: Eprints, Support
Date Deposited: 06 Nov 2017 09:03
Last Modified: 06 Nov 2017 19:59
URI: http://eprints.nottingham.ac.uk/id/eprint/47837

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