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Enhanced penetration and cytotoxicity of metformin and collagenase conjugated gold nanoparticles in breast cancer spheroids

Author:
Abdolahinia, Elaheh Dalir, Nadri, Samad, Rahbarghazi, Reza, Barar, Jaleh, Aghanejad, Ayoub, Omidi, Yadollah
Source:
Life sciences 2019 v.231 pp. 116545
ISSN:
0024-3205
Subject:
apoptosis, breast neoplasms, breasts, cell lines, cell proliferation, collagen, collagenase, cytotoxicity, enzyme-linked immunosorbent assay, extracellular matrix, flow cytometry, fluorescent antibody technique, metformin, nanogold, nanoparticles, neoplasm cells, pyruvate kinase, quantitative polymerase chain reaction, stem cells
Abstract:
The extracellular matrix (ECM) within the tumor nest plays a key role in cancer cell proliferation and invasion. It has been proven that the increased density of ECM, especially collagen network, correlates with the poor distribution of gold-nanoparticles (GNPs) to the tumor mass. Here, for the first time, we examined the combined effect of collagenase (COL) with metformin (MET)-conjugated GNPs on mammosphere generated from JIMT-1 breast cell line in vitro.Mammospheres (on days 7 and 14) and monolayer culture were treated with MET, MET-GNPs, and a mixture of COL-GNPs and MET-GNPs for 5 days. To assess the impacts of the engineered nanoparticles (NPs) on the survival/apoptosis of cancer cells and cancer stem cells (CSCs), the amount/activity of collagen and the expression of pyruvate kinase M2, different methods were applied, including MTT, flow cytometry, immunofluorescence, ELISA and real-time PCR analyses. Our results confirmed the enhanced cytotoxic effects of MET-GNPs combined with COL-GNPs on mammospheres compared to the cells treated with MET alone or MET-GNPs.Upon treatment with the mixture of MET-GNPs and COL-GNPs, the population of the apoptotic cells was significantly increased. A marked reduction was found in the number of CD24−/CD44+ CSCs and the amount of collagen in the group received a mixture of MET-GNPs and COL-GNPs.Based on our findings, the use of COL can improve the cellular interaction/penetration of MET-GNPs in mammospheres and its antitumor impacts on the CSCs.
Agid:
6465571