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Anti-tumour effects of a dual cancer-specific oncolytic adenovirus on Breast Cancer Stem cells. | LitMetric

AI Article Synopsis

Article Abstract

Apoptin can specifically kill cancer cells but has no toxicity to normal cells. Human telomerase reverse transcriptase (hTERT) can act as a tumour-specific promoter by triggering the expression of certain genes in tumour cells. This study aims to investigate the inhibitory effects and to explore the inhibitory pathway of a dual cancer-specific recombinant adenovirus (Ad-apoptin-hTERTp-E1a, Ad-VT) on breast cancer stem cells. Breast cancer cell spheres were obtained from MCF-7 cells through serum-free suspension culture. The cell spheres were detected by flow cytometry for CD44 CD24 cell subsets. The stemness of MCF-7-CSC cells was confirmed by in vivo tumorigenesis experiments. The inhibitory effect of the recombinant adenoviruses on MCF-7-CSC cells was evaluated by CCK-8 assay. In addition, the stemness of adenovirus-infected MCF-7-CSC cells was analysed by testing the presence of CD44 CD24 cell subsets. The ability of the recombinant adenovirus to induce MCF-7-CSC cell apoptosis was detected by staining JC-1, TMRM and Annexin V. Our results showed that a significantly higher proportion of the CD44 CD24 cell subsets was present in MCF-7-CSC cells with a significantly increased expression of stem cell marker proteins. The MCF-7-CSC cells, whlist exhibited a strong tumorigenic ability with a certain degree of stemness in mice, were shown to be strongly inhibited by recombinant adenovirus Ad-VT through cell apoptosis. In addition, Ad-VT was shown to exert a killing effect on BCSCs. These results provide a new theoretical basis for the future treatment of breast cancer.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7812255PMC
http://dx.doi.org/10.1111/jcmm.16113DOI Listing

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