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Adipose Tissue-Derived Stem Cell Imaging Using Cadmium-Free Quantum Dots.

Yoshiyuki Miyazaki1, Hiroshi Yukawa2, Hiroyasu Nishi3

  • 1Department of Applied Chemistry, Nagoya University Graduate School of Engineering , Furo-cho, Chikusa-ku, Nagoya , Japan.

Cell Medicine
|February 10, 2016
PubMed
Summary

Cd-free quantum dots (QDs) were developed for stem cell labeling. These novel ZnS-ZAIS-SO3H QDs showed excellent biocompatibility and labeling efficiency in mouse adipose-derived stem cells (mASCs).

Keywords:
Adipose tissue-derived stem cells (ASCs)Cadmium-free quantum dots (Cd-free QDs)Octaarginine (R8)

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Quantum dots (QDs) offer superior optical properties for bioimaging.
  • Commercially available QDs often contain toxic cadmium (Cd), necessitating safer alternatives.
  • Developing cadmium-free QDs is crucial for reduced toxicity in biological applications.

Purpose of the Study:

  • To develop and evaluate cadmium-free quantum dots (ZnS-ZAIS-SO3H) for stem cell labeling.
  • To investigate the efficiency and safety of labeling mouse adipose-derived stem cells (mASCs) with these novel QDs.
  • To determine the optimal conditions for QD transduction into stem cells.

Main Methods:

  • Synthesis of cadmium-free ZnS-ZAIS-SO3H nanoparticles.
  • Transduction of ZnS-ZAIS-SO3H into mASCs using octaarginine (R8) peptides.
  • Assessment of cell viability, proliferation, and morphology post-labeling.

Main Results:

  • An optimal ZnS-ZAIS-SO3H:R8 ratio of 1:100 was determined for effective mASC labeling.
  • Over 80% of labeled mASCs remained viable, with maintained proliferation rates.
  • No significant abnormalities in mASC morphology were observed after labeling.

Conclusions:

  • ZnS-ZAIS-SO3H nanoparticles are a promising, non-toxic alternative for stem cell labeling.
  • The developed QD labeling method demonstrates high biocompatibility with mASCs.
  • These findings support the potential use of ZnS-ZAIS-SO3H QDs in stem cell tracking and therapeutic applications.