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Bioengineered Fluorescent Nanoprobe Conjugates for Tracking Human Bone Cells: In Vitro Biocompatibility Analysis
Christiane L Salgado1,2, Alexandra A P Mansur3,4, Herman S Mansur3,4
1i3S-Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Rua Alfredo Allen, 208, 4200-135 Porto, Portugal.
Materials (Basel, Switzerland)
|August 27, 2021
Summary
Novel fluorescent quantum dots (QDs) modified with O-phospho-L-serine (OPS) show biocompatibility and targeted uptake in human bone cells. These OPS-modified chitosan QDs are promising for bioimaging and pre-clinical applications.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Cell Biology
Background:
- Developing biocompatible fluorescent nanoparticles is crucial for advanced bioimaging and cellular studies.
- Quantum dots (QDs) offer unique optical properties but require surface functionalization for safe and targeted cellular applications.
- Chitosan (Chi) and O-phospho-L-serine (OPS) are known for their biocompatibility and cell-targeting potential.
Purpose of the Study:
- To validate novel functionalized hybrid semiconductor bioconjugates (QDs) for biocompatibility and targeted cellular uptake.
- To investigate the influence of surface modification (Chi vs. Chi-OPS) on nanoparticle behavior in different human cell types.
- To explore the potential of OPS-modified QDs in cell imaging, tracking intracellular mechanisms, and inducing osteogenic differentiation.
Main Methods:
- Synthesis and characterization of fluorescent quantum dots (CdS core) capped with chitosan (Chi) and modified with O-phospho-L-serine (OPS).
- Spectroscopic (UV, photoluminescence) and morphological (TEM) analyses to confirm nanoparticle properties (size ~2.3 nm, stable emission).
- In vitro biocompatibility assays, cellular uptake studies in various human cell sources (primary vs. cell lines, bone vs. skin), and assessment of effects on cell biology (adhesion, proliferation, differentiation).
Main Results:
- Chitosan-capped QDs functionalized with OPS demonstrated biocompatibility across different human cell sources.
- OPS modification enabled preferential accumulation in human bone mesenchymal stromal cells (HBMSC).
- Cellular uptake efficiency varied with cell type and tissue source, with OPS enhancing uptake.
- Nanoparticles did not interfere with normal cellular functions, including osteogenic differentiation.
- OPS-modified QDs induced late-osteoblast phenotype and increased extracellular matrix mineralization in HBMSCs, suggesting a role for Caveolin-1 mediated endocytosis.
Conclusions:
- OPS-modified chitosan QDs are reliable, stable fluorescent bioprobes for cell imaging and targeting.
- These bioconjugates can clarify intracellular trafficking mechanisms and osteogenic differentiation induction.
- The in vitro biocompatibility and targeted uptake indicate prospective applications in laboratory and pre-clinical settings, including bioimaging and ex-vivo cellular evaluation of biomedical implants.
