Abstract
Novel nanoparticle-based therapies, in combination with cytotoxic drugs, are a new paradigm that is being explored. Methotrexate (MTX), a folic acid (FA) analog, is internalized by the folic acid receptor (FAR) which is known to be overexpressed in many cancer cells like breast cancer. MTX suppresses cell division by binding and blocking the dihydrofolate reductase, resulting in cell death due to cell cycle arrest. Thus, targeting FAR is an attractive strategy for controlling breast cancer cells. Zinc oxide nanoparticles (ZnONPs) are known biocompatible agents with anticancer and antimicrobial properties. Both MTX and ZnONPs have limitations such as nonspecific absorption and toxicity. In this study, we have attempted to use a combinatorial approach using MTX and ZnONPs, to target FAR on breast cancer cells and to improve the specificity towards cancer cells and be safe towards normal cells. Cytotoxicity of MTX–ZnONPs was assessed via MTT assay and acridine orange/ethidium bromide staining, which showed specificity and anticancer potential towards MTX-sensitive MCF-7 and MTX-resistant MDA-MB-231 cell lines, while showing less toxicity towards MCF-10A control cells. Also, the RBC haemolysis assay supports the biocompatible nature of MTX–ZnONPs, showing no haemolysis. Our results reveal MTX–ZnONPs as a novel nanosystem for showing specificity and cytotoxicity towards breast cancer cells, including MTX-resistant MDA-MB-231.
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Acknowledgements
We would like to acknowledge the Department of MEMS, IIT Bombay, for XRD analysis and SAIF, IIT Bombay, for ICP-AES, SEM-EDS and HR-TEM facilities. We also acknowledge Khandelwal Laboratories Pvt. Ltd, Mumbai, India, for providing an MTX gift sample. We would also like to thank Dr Padma V Devarajan and Dr K C Barick for their insightful suggestions in the research work.
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Joshi, M., Bhatt, P. Deciphering the anticancer activity of biocompatible zinc oxide nanoparticles loaded with methotrexate on breast cancer cells. Bull Mater Sci 46, 192 (2023). https://doi.org/10.1007/s12034-023-03044-9
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DOI: https://doi.org/10.1007/s12034-023-03044-9