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Updated: Aug 11, 2026
Integrated Bone Formation Through In Vivo Endochondral Ossification Using Mesenchymal Stem Cells
Published on: July 14, 2023
The internalized CdSe/ZnS quantum dots impair the chondrogenesis of bone marrow mesenchymal stem cells
Shu-Chen Hsieh1, Fung-Fang Wang, Shih-Chieh Hung
1Institute of Biomedical Engineering, National Yang Ming University, Shih-Pai, Taipei, Taiwan, Republic of China.
Abstract:
Mesenchymal stem cells (MSCs) are capable of differentiating into multiple cell lineages and are useful for therapeutic applications. Labeling the MSCs with fluorescent probes is beneficial in tracing the fate of MSCs after implantation. We have introduced the CdSe/ZnS quantum dots (QDs) into the human bone marrow MSCs and examined the effects of QDs on the proliferation and chondrogenesis of the cells. The internalized QDs were found localized in perinuclear regions and remained there after a number of cell passages. The presence of QDs did not affect the proliferation of cells or the size of chondrospheres formed, when subjected to chondrogenesis induction. However, the expression of mRNA and protein of type II collagen and aggrecan in the chondrospheres was significantly inhibited in cells labeled with QDs, suggesting impaired chondrogenesis. Our results that the presence of QDs interferes with the chondrogenic differentiation of MSCs raise concerns in using the QDs as fluorescence tracers for stem cells.
Insights
Quantum dots (QDs) labeling human mesenchymal stem cells (MSCs) did not affect cell proliferation but impaired chondrogenic differentiation. This suggests caution when using QDs for tracking stem cells in therapeutic applications.
Area of Science:
- Biomedical Engineering
- Stem Cell Biology
- Nanotechnology
Background:
- Mesenchymal stem cells (MSCs) are crucial for regenerative medicine due to their differentiation potential.
- Fluorescent labeling of MSCs aids in tracking their behavior post-transplantation.
- Quantum dots (QDs) offer bright and stable fluorescence for cellular imaging.
Purpose of the Study:
- To investigate the impact of CdSe/ZnS quantum dots (QDs) on human bone marrow MSCs.
- To assess the effects of QD labeling on MSC proliferation and chondrogenesis.
Main Methods:
- Human bone marrow MSCs were labeled with CdSe/ZnS QDs.
- Cell proliferation assays were performed.
- Chondrogenesis induction was carried out, followed by analysis of chondrosphere formation.
- Gene and protein expression of chondrogenic markers (collagen type II, aggrecan) were evaluated.
Main Results:
- QDs localized to the perinuclear region and were stable through multiple cell passages.
- QD labeling did not significantly alter MSC proliferation rates.
- Chondrosphere size remained unaffected by QD presence.
- Significant inhibition of type II collagen and aggrecan mRNA and protein expression was observed in QD-labeled MSCs undergoing chondrogenesis.
Conclusions:
- CdSe/ZnS QDs interfere with the chondrogenic differentiation of human MSCs.
- The use of QDs as fluorescence tracers for stem cell applications requires careful consideration due to potential impacts on differentiation pathways.
