Abstract
The monitoring of grafted stem cells is crucial to assess the efficiency, effectiveness and safety of such stem cell-based therapies. In this regard, a reliable and cytocompatible labeling method for stem cells is critically needed. In this study, the collagen-functionalized single-walled carbon nanotubes (Col-SWCNTs) were used as imaging probes for labeling of human mesenchymal stem cells (hMSCs) and the inherent Raman scattering of SWCNTs was used to image the SWCNT-labeled cells. The results showed that the Col-SWCNTs exhibit efficient cellular internalization by hMSCs without affecting their proliferation and differentiation. The prolonged dwell time of Col-SWCNTs in cells ensured the long-term labeling for up to 2 weeks. This work reveals the potential of Col-SWCNTs as probes for long-term stem cell labeling.
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