AI Article Synopsis
- Osteoarthritis is a leading cause of disability, and while current treatments are limited, cell-based therapies such as mesenchymal stem cells (MSCs) show promise for regenerative medicine, especially when combined with gene therapy.
- Researchers used lentiviral vectors to transduce equine MSCs with a luciferase gene controlled by an NFκB-responsive promoter, which gets activated by inflammatory cytokines like IL-1β and TNFα.
- The study found that stimulating the MSCs with these cytokines led to a dose-dependent increase in luciferase expression, highlighting the ability to regulate gene expression based on inflammatory signals, which could have implications for targeted therapies in osteoarthritis.
Article Abstract
Background: Osteoarthritis, a chronic and progressive degenerative joint disorder, ranks amongst the top five causes of disability. Given the high incidence, associated socioeconomic costs and the absence of effective disease-modifying therapies of osteoarthritis, cell-based treatments offer a promising new approach. Owing to their paracrine, differentiation and self-renewal abilities, mesenchymal stem cells (MSCs) have great potential for regenerative medicine, which might be further enhanced by targeted gene therapy. Hence, the development of systems allowing transgene expression, particularly when regulated by natural disease-dependent occuring substances, is of high interest.
Methods: Bone marrow-isolated equine MSCs were stably transduced with an HIV-1 based lentiviral vector expressing the luciferase gene under control of an inducible nuclear factor κB (NFκB)-responsive promoter. Marker gene expression was analysed by determining luciferase activity in transduced cells stimulated with different concentrations of interleukin (IL)-1β or tumour necrosis factor (TNF)α.
Results: A dose-dependent increase in luciferase expression was observed in transduced MSCs upon cytokine stimulation. The induction effect was more potent in cells treated with TNFα compared to those treated with IL-1β. Maximum transgene expression was obtained after 48 h of stimulation and the same time was necessary to return to baseline luciferase expression levels after withdrawal of the stimulus. Repeated cycles of induction allowed on-off modulation of transgene expression without becoming refractory to induction. The NFκB-responsive promoter retained its inducibility also in chondrogenically differentiated MSC/Luc cells.
Conclusions: The results of the present study demonstrate that on demand transgene expression from the NFκB-responsive promoter using naturally occurring inflammatory cytokines can be induced in undifferentiated and chondrogenically differentiated equine MSCs. Copyright © 2016 John Wiley & Sons, Ltd.
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| http://dx.doi.org/10.1002/jgm.2888 | DOI Listing |
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