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Evaluation of the biocompatibility of the GSH-coated Ag2S quantum dots in vitro: a perfect example for the non-toxic optical probes

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Abstract

Near-infrared quantum dots (NIR QDs) are promising candidate for the fluorescent probes due to their better penetration depth, long-lived luminescence with size-tunable photoluminescence wavelengths. Glutathione-coated silver sulfide quantum dots (GSH-Ag2S QDs) were synthesized using AgNO3 and Na2S in the aqueous media and they can give reaction with glutathione reductase (GR) and glutathione-s transferase (GST) enzymes as acting substrate analogue in vitro. Investigation of the toxicity of the nanomaterials are necessary to use them in the medical field and biomedical applications. Thus, in this study we investigated biocompatibility of the GSH-Ag2S QDs in vitro using 293 T and CFPAC-1 cell lines. Cell viability by MTT assay, light microscopy, fluorescence microscopy, oxidative stress enzyme activities and ICP-MS analysis were performed to evaluate the cytotoxicity and internalization of the GSH-Ag2S QDs. GSH-Ag2S QDs showed great biocompatibility with both cell lines and did not cause imbalance in the oxidative stress metabolism. The ultralow solubility product constant of Ag2S QDs (Ksp = 6.3 × 10–50) prevents release of Ag ions into the biological systems that is in agreement with data obtained by ICP-MS. In conclusion, this data prove potential of GSH-Ag2S QDs as a biocompatible optical probe to be used for the detection and/or targeting of GSH impaired diseases including cancer.

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The data obtained/analyzed during this study are available from the corresponding author on reasonable request.

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Acknowledgement

The authors gratefully acknowledge use of the services and facilities of the Koç University Research Center for Translational Medicine (KUTTAM) (252-172), funded by the Presidency of Turkey, Presidency of Strategy and Budget. The content is solely the responsibility of the authors and does not necessarily represent the official views of the Presidency of Strategy and Budget.

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Authors and Affiliations

  1. Department of Medical Biochemistry, School of Medicine, Koc University, Sariyer, 34450, Istanbul, Turkey

    Duygu Aydemir & Nuriye Nuray Ulusu

  2. Koc University Research Center for Translational Medicine (KUTTAM), Sariyer, 34450, Istanbul, Turkey

    Duygu Aydemir & Nuriye Nuray Ulusu

  3. Materials Science and Engineering, Koc University, Sariyer, 34450, Istanbul, Turkey

    Mahshid Hashemkhani & Havva Yagci Acar

  4. Department of Chemistry, Koc University, Sariyer, 34450, Istanbul, Turkey

    Havva Yagci Acar

  5. Surface Science and Technology Center (KUYTAM), Koc University, Sariyer, 34450, Istanbul, Turkey

    Havva Yagci Acar

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  1. Duygu Aydemir
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NNU and HYA conceived and designed the experiments. DA and MH supported the organization of the project, performed the experiments and analyzed the data. DA and MH wrote the paper. All contributing authors have read and approved the final version of the manuscript.

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Correspondence to Havva Yagci Acar or Nuriye Nuray Ulusu.

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Aydemir, D., Hashemkhani, M., Acar, H.Y. et al. Evaluation of the biocompatibility of the GSH-coated Ag2S quantum dots in vitro: a perfect example for the non-toxic optical probes. Mol Biol Rep 47, 4117–4129 (2020). https://doi.org/10.1007/s11033-020-05522-3

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