AI Article Synopsis
- Gold nanoparticles (AuNPs) combined with stem cells may improve the effectiveness of photothermal therapy (PT) for targeting tumors, but ensuring efficient delivery of AuNPs into stem cells is crucial.
- Various nanoparticle combinations were tested on human mesenchymal stem cells (hMSCs) to assess cytotoxicity and maintain AuNPs without loss, with SGS showing no toxicity at 20 μg/mL and enhanced heat generation when injected into tumor-bearing mice.
- The additional silica layer in SGSs helps protect AuNPs from loss due to physical stress, potentially advancing techniques for more effective photothermal therapy.
Article Abstract
Background: Various methods based on gold nanoparticles (AuNPs) have been applied to enhance the photothermal effect. Among these methods, combining gold nanoparticles and stem cells has been suggested as a new technique for elevating the efficiency of photothermal therapy (PT) in terms of enhancing tumor targeting effect. However, to elicit the efficiency of PT using gold nanoparticles and stem cells, delivering large amounts of AuNPs into stem cells without loss should be considered.
Methods: AuNPs, AuNPs-decorated silica nanoparticles, and silica-capped and AuNPs-decorated silica nanoparticles (SGSs) were synthesized and used to treat human mesenchymal stem cells (hMSCs). After evaluating physical properties of each nanoparticle, the concentration of each nanoparticle was estimated based on its cytotoxicity to hMSCs. The amount of AuNPs loss from each nanoparticle by exogenous physical stress was evaluated after exposing particles to a gentle shaking. After these experiments, in vitro and in vivo photothermal effects were then evaluated.
Results: SGS showed no cytotoxicity when it was used to treat hMSCs at concentration up to 20 μg/mL. After intravenous injection to tumor-bearing mice, SGS-laden hMSCs group showed significantly higher heat generation than other groups following laser irradiation. Furthermore, in vivo photothermal effect in the hMSC-SGS group was significantly enhanced than those in other groups in terms of tumor volume decrement and histological outcome.
Conclusion: Our results suggest that additional silica layer in SGSs could protect AuNPs from physical stress induced AuNPs loss. The strategy applied in SGS may offer a prospective method to improve PT.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9679086 | PMC |
| http://dx.doi.org/10.1007/s13770-022-00468-y | DOI Listing |
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