A Green Synthesis of Au-Ag Alloy Nanoparticles using Polydopamine Chemistry: Evaluation of their Anticancer Potency Towards Both MCF-7 Cells and their Cancer Stem Cells Subgroup


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Background:Limited chemotherapy efficacy and cancer stem cells (CSCs)-induced therapeutic resistance are major difficulties for tumour treatment. Adopting more efficient therapies to eliminate bulk-sensitive cancer cells and resistant CSCs is urgently needed.

Methods:Based on the potential and functional complementarity of gold and silver nanoparticles (AuNPs or AgNPs) on tumour treatment, bimetallic NPs (alloy) have been synthesized to obtain improved or even newly emerging bioactivity from a combination effect. This study reported a facile, green and economical preparation of Au-Ag alloy NPs using biocompatible polydopamine (PDA) as a reductant, capping, stabilizing and hydrophilic agent.

Results:These alloy NPs were quasi-spherical with rough surfaces and recorded in diameters of 80 nm. In addition, these alloy NPs showed good water dispersity, stability and photothermal effect. Compared with monometallic counterparts, these alloy NPs demonstrated a dramatically enhanced cytotoxic/pro-apoptotic/necrotic effect towards bulk-sensitive MCF-7 and MDA-MB-231 cells. The underlying mechanism regarding the apoptotic action was associated with a mitochondria-mediated pathway, as evidenced by Au3+/Ag+ mediated Mitochondria damage, ROS generation, DNA fragmentation and upregulation of certain apoptotic-related genes (Bax, P53 and Caspase 3). Attractively, these Au-Ag alloy NPs showed a remarkably improved inhibitory effect on the mammosphere formation capacity of MCF-7 CSCs.

Conclusion:All the positive results were attributed to incorporated properties from Au, Ag and PDA, the combination effect of chemotherapy and photothermal therapy and the nano-scaled structure of Au-Ag alloy NPs. In addition, the high biocompatibility of Au-Ag alloy NPs supported them as a good candidate in cancer therapy.

Об авторах

Honglei Zhan

Department of Biopharmacy, School of Bioengineering, Dalian Polytechnic University

Автор, ответственный за переписку.
Email: info@benthamscience.net

Shiyu Ding

Department of Biopharmacy, School of Bioengineering, Dalian Polytechnic University

Email: info@benthamscience.net

Ruiyu Shen

Department of Biopharmacy, School of Bioengineering, Dalian Polytechnic University

Email: info@benthamscience.net

Yulong Lv

Department of Biopharmacy, School of Bioengineering, Dalian Polytechnic University

Email: info@benthamscience.net

Xinran Tian

Department of Biopharmacy, School of Bioengineering, Dalian Polytechnic University

Email: info@benthamscience.net

Guie Liu

Department of Biopharmacy, School of Bioengineering, Dalian Polytechnic University

Email: info@benthamscience.net

Chaoyue Li

Department of Biopharmacy, School of Bioengineering, Dalian Polytechnic University

Email: info@benthamscience.net

Jihui Wang

Department of Biopharmacy, School of Bioengineering, Dalian Polytechnic Universit

Email: info@benthamscience.net

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