期刊
BIOMATERIALS
卷 33, 期 32, 页码 8142-8151出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2012.07.036
关键词
siRNA delivery; Nanoparticle; Mesenchymal stem cell; Genetic engineering; Bone tissue engineering
资金
- National Institutes of Health [R21CA152473]
- Department of Defense [DM090323]
- National Science Foundation
- Microscopy and Imaging Core Module of the Wilmer Core Grant [EY001765]
Enhancing human mesenchymal stem cell (hMSC) differentiation via RNA interference (RNAi) could provide an effective way of controlling cell fate for tissue engineering, but a safe and effective delivery vehicle must first be developed. Here, we evaluated an array of synthetic end-modified poly(beta-amino ester) (PBAE)-based nanoparticles to optimize siRNA delivery into hMSCs. In general, cystamine-terminated polymers caused the most knockdown, with the best polymer achieving 91% knockdown 20 days post-transfection. Binding studies revealed that the cystamine-terminated polymer bound siRNA tightly at lower weight ratios of polymer to siRNA but then efficiently released siRNA upon exposure to a reducing environment, suggesting that this class of PBAEs can form tight initial interactions with its cargo and then cause efficient, environmentally-triggered release in the cytoplasm. Finally, we tested a functional application of this system by transfecting hMSCs with siRNA against an inhibitor of osteogenesis, B-cell lymphoma (Bcl)-like protein 2 (BCL2L2). This resulted in enhanced osteogenesis over 4 weeks as evidenced by Alizarin Red S staining and calcium quantification. The bioreducible PBAE/siRNA nanoparticles developed here can provide a means of safe and effective control of hMSC differentiation for a wide variety of applications. (C) 2012 Elsevier Ltd. All rights reserved.
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